diff --git a/apps/calendar/CLAUDE.md b/apps/calendar/CLAUDE.md
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+# Calendar Project Guide
+
+## Übersicht
+
+**Kalender** ist eine vollständige Kalender-Anwendung für persönliches und geteiltes Zeitmanagement. Die App unterstützt mehrere Kalender, wiederkehrende Termine, CalDAV/iCal-Synchronisation und Erinnerungen.
+
+| App | Port | URL |
+|-----|------|-----|
+| Backend | 3014 | http://localhost:3014 |
+| Web App | 5179 | http://localhost:5179 |
+| Landing Page | 4322 | http://localhost:4322 |
+| Mobile | 8081 | Expo Go |
+
+## Project Structure
+
+```
+apps/calendar/
+├── apps/
+│   ├── backend/      # NestJS API server (@calendar/backend)
+│   │   └── src/
+│   │       ├── main.ts
+│   │       ├── app.module.ts
+│   │       ├── db/           # Drizzle schemas + migrations
+│   │       │   ├── schema/
+│   │       │   │   ├── calendars.schema.ts
+│   │       │   │   ├── events.schema.ts
+│   │       │   │   ├── reminders.schema.ts
+│   │       │   │   ├── calendar-shares.schema.ts
+│   │       │   │   └── external-calendars.schema.ts
+│   │       │   └── db.ts
+│   │       ├── calendar/     # Calendar CRUD
+│   │       ├── event/        # Event CRUD + queries
+│   │       ├── reminder/     # Reminders + notifications
+│   │       ├── sync/         # CalDAV/iCal sync
+│   │       ├── share/        # Calendar sharing
+│   │       └── health/
+│   │
+│   ├── web/          # SvelteKit web application (@calendar/web)
+│   │   └── src/
+│   │       ├── lib/
+│   │       │   ├── api/          # API clients
+│   │       │   │   ├── client.ts
+│   │       │   │   ├── calendars.ts
+│   │       │   │   ├── events.ts
+│   │       │   │   ├── reminders.ts
+│   │       │   │   └── shares.ts
+│   │       │   ├── stores/       # Svelte 5 runes stores
+│   │       │   │   ├── auth.svelte.ts
+│   │       │   │   ├── view.svelte.ts
+│   │       │   │   ├── calendars.svelte.ts
+│   │       │   │   ├── events.svelte.ts
+│   │       │   │   ├── theme.ts
+│   │       │   │   ├── navigation.ts
+│   │       │   │   └── toast.ts
+│   │       │   ├── components/
+│   │       │   │   ├── calendar/
+│   │       │   │   │   ├── CalendarHeader.svelte
+│   │       │   │   │   ├── WeekView.svelte
+│   │       │   │   │   ├── DayView.svelte
+│   │       │   │   │   ├── MonthView.svelte
+│   │       │   │   │   ├── MiniCalendar.svelte
+│   │       │   │   │   └── CalendarSidebar.svelte
+│   │       │   │   └── event/
+│   │       │   │       └── EventForm.svelte
+│   │       │   └── i18n/         # Internationalization (5 Sprachen)
+│   │       └── routes/
+│   │           ├── +layout.svelte
+│   │           ├── +page.svelte          # Hauptkalender (Wochenansicht)
+│   │           ├── agenda/+page.svelte   # Agenda-Ansicht
+│   │           ├── event/
+│   │           │   ├── new/+page.svelte  # Neuer Termin
+│   │           │   └── [id]/+page.svelte # Termin bearbeiten
+│   │           ├── calendars/+page.svelte
+│   │           ├── settings/+page.svelte
+│   │           ├── feedback/+page.svelte
+│   │           └── (auth)/
+│   │               ├── login/+page.svelte
+│   │               ├── register/+page.svelte
+│   │               └── forgot-password/+page.svelte
+│   │
+│   ├── landing/      # Astro marketing landing page (@calendar/landing)
+│   │   └── src/
+│   │       ├── pages/index.astro
+│   │       ├── layouts/Layout.astro
+│   │       └── components/
+│   │           ├── Hero.astro
+│   │           ├── Features.astro
+│   │           ├── CTA.astro
+│   │           └── Footer.astro
+│   │
+│   └── mobile/       # Expo/React Native mobile app (@calendar/mobile) [TODO]
+│
+├── packages/
+│   ├── shared/       # Shared types, utils, constants (@calendar/shared)
+│   │   └── src/
+│   │       ├── types/
+│   │       │   ├── calendar.ts
+│   │       │   ├── event.ts
+│   │       │   ├── reminder.ts
+│   │       │   └── share.ts
+│   │       └── index.ts
+│   └── web-ui/       # Shared Svelte components (@calendar/web-ui) [TODO]
+│
+├── package.json
+└── CLAUDE.md
+```
+
+## Commands
+
+### Root Level (from monorepo root)
+
+```bash
+# Alle Apps starten
+pnpm calendar:dev                 # Run all calendar apps
+
+# Einzelne Apps starten
+pnpm dev:calendar:backend         # Start backend server (port 3014)
+pnpm dev:calendar:web             # Start web app (port 5179)
+pnpm dev:calendar:landing         # Start landing page (port 4322)
+pnpm dev:calendar:mobile          # Start mobile app [TODO]
+pnpm dev:calendar:app             # Start web + backend together
+
+# Datenbank
+pnpm calendar:db:push             # Push schema to database
+pnpm calendar:db:studio           # Open Drizzle Studio
+pnpm calendar:db:seed             # Seed initial data
+```
+
+### Backend (apps/calendar/apps/backend)
+
+```bash
+pnpm dev                         # Start with hot reload
+pnpm build                       # Build for production
+pnpm start:prod                  # Start production server
+pnpm db:push                     # Push schema to database
+pnpm db:studio                   # Open Drizzle Studio
+pnpm db:seed                     # Seed initial data
+```
+
+### Web App (apps/calendar/apps/web)
+
+```bash
+pnpm dev                         # Start dev server
+pnpm build                       # Build for production
+pnpm preview                     # Preview production build
+```
+
+### Landing Page (apps/calendar/apps/landing)
+
+```bash
+pnpm dev                         # Start dev server (port 4322)
+pnpm build                       # Build for production
+pnpm preview                     # Preview build
+```
+
+## Technology Stack
+
+| Layer | Technology |
+|-------|------------|
+| **Backend** | NestJS 10, Drizzle ORM, PostgreSQL |
+| **Web** | SvelteKit 2.x, Svelte 5 (runes mode), Tailwind CSS 4 |
+| **Landing** | Astro 5.x, Tailwind CSS |
+| **Mobile** | React Native 0.81 + Expo SDK 54, NativeWind [TODO] |
+| **Auth** | Mana Core Auth (JWT) |
+| **i18n** | svelte-i18n (DE, EN, FR, ES, IT) |
+| **Dates** | date-fns |
+| **Sync** | ical.js, tsdav (CalDAV) |
+
+## Architecture
+
+### Core Features
+
+1. **Persönliche Kalender** - Erstelle und verwalte mehrere farbcodierte Kalender
+2. **Termine** - Vollständiges CRUD mit Wiederholungsunterstützung (RFC 5545 RRULE)
+3. **Geteilte Kalender** - Teile Kalender mit Lese-/Schreib-/Admin-Berechtigungen
+4. **CalDAV/iCal Sync** - Bi-direktionale Synchronisation mit Google, Apple, etc.
+5. **Erinnerungen** - Push-Benachrichtigungen und E-Mail-Erinnerungen
+
+### Kalender-Ansichten
+
+| Ansicht | Route | Beschreibung |
+|---------|-------|--------------|
+| **Woche** | `/` (default) | 7-Tage-Raster mit Stunden |
+| **Tag** | Click auf Tag | 24-Stunden-Timeline |
+| **Monat** | Header-Switch | Traditionelles Kalenderraster |
+| **Agenda** | `/agenda` | Chronologische Terminliste |
+| **Jahr** | [TODO] | Kompakte 12-Monats-Übersicht |
+
+### Web App Stores (Svelte 5 Runes)
+
+```typescript
+// auth.svelte.ts - Authentifizierung
+authStore.isAuthenticated  // boolean
+authStore.user             // User | null
+authStore.signIn(email, password)
+authStore.signOut()
+authStore.getAccessToken()
+
+// view.svelte.ts - Kalender-Ansicht
+viewStore.currentDate      // Date
+viewStore.viewType         // 'day' | 'week' | 'month' | 'year' | 'agenda'
+viewStore.setDate(date)
+viewStore.setViewType(type)
+viewStore.goToToday()
+viewStore.navigate(direction) // 'prev' | 'next'
+
+// calendars.svelte.ts - Kalender-Verwaltung
+calendarsStore.calendars   // Calendar[]
+calendarsStore.loading     // boolean
+calendarsStore.fetchCalendars()
+calendarsStore.createCalendar(data)
+calendarsStore.updateCalendar(id, data)
+calendarsStore.deleteCalendar(id)
+calendarsStore.getColor(calendarId)
+
+// events.svelte.ts - Termine
+eventsStore.events         // Event[]
+eventsStore.loading        // boolean
+eventsStore.fetchEvents(start, end)
+eventsStore.getEventsForDay(date)
+eventsStore.getEventsForWeek(date)
+eventsStore.createEvent(data)
+eventsStore.updateEvent(id, data)
+eventsStore.deleteEvent(id)
+```
+
+### Backend API Endpoints
+
+#### Health
+
+| Endpoint | Method | Description |
+|----------|--------|-------------|
+| `/api/v1/health` | GET | Health check |
+
+#### Calendars
+
+| Endpoint | Method | Description |
+|----------|--------|-------------|
+| `/api/v1/calendars` | GET | List user's calendars |
+| `/api/v1/calendars` | POST | Create calendar |
+| `/api/v1/calendars/:id` | GET | Get calendar details |
+| `/api/v1/calendars/:id` | PUT | Update calendar |
+| `/api/v1/calendars/:id` | DELETE | Delete calendar |
+
+#### Events
+
+| Endpoint | Method | Description |
+|----------|--------|-------------|
+| `/api/v1/events` | GET | Query events (date range) |
+| `/api/v1/events` | POST | Create event |
+| `/api/v1/events/:id` | GET | Get event details |
+| `/api/v1/events/:id` | PUT | Update event |
+| `/api/v1/events/:id` | DELETE | Delete event |
+| `/api/v1/events/calendar/:calendarId` | GET | Get events by calendar |
+
+#### Reminders
+
+| Endpoint | Method | Description |
+|----------|--------|-------------|
+| `/api/v1/events/:eventId/reminders` | GET | List event reminders |
+| `/api/v1/events/:eventId/reminders` | POST | Add reminder |
+| `/api/v1/reminders/:id` | DELETE | Remove reminder |
+
+#### Sharing
+
+| Endpoint | Method | Description |
+|----------|--------|-------------|
+| `/api/v1/calendars/:id/shares` | GET | List calendar shares |
+| `/api/v1/calendars/:id/shares` | POST | Share calendar |
+| `/api/v1/shares/:shareId/accept` | POST | Accept invitation |
+| `/api/v1/shares/:shareId/decline` | POST | Decline invitation |
+
+#### Sync
+
+| Endpoint | Method | Description |
+|----------|--------|-------------|
+| `/api/v1/sync/external` | GET | List external calendars |
+| `/api/v1/sync/external` | POST | Connect external calendar |
+| `/api/v1/sync/external/:id` | DELETE | Disconnect external |
+| `/api/v1/sync/external/:id/sync` | POST | Trigger manual sync |
+| `/api/v1/sync/caldav/discover` | POST | Discover CalDAV calendars |
+| `/api/v1/calendars/:id/export.ics` | GET | Export calendar as iCal |
+
+### Database Schema
+
+#### calendars
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `id` | UUID | Primary key |
+| `user_id` | UUID | Owner |
+| `name` | VARCHAR(255) | Calendar name |
+| `description` | TEXT | Optional description |
+| `color` | VARCHAR(7) | Hex color code (#3B82F6) |
+| `is_default` | BOOLEAN | Default calendar flag |
+| `is_visible` | BOOLEAN | Visibility in UI |
+| `timezone` | VARCHAR(100) | Default timezone |
+| `settings` | JSONB | CalendarSettings object |
+| `created_at` | TIMESTAMP | Creation time |
+| `updated_at` | TIMESTAMP | Last update |
+
+#### events
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `id` | UUID | Primary key |
+| `calendar_id` | UUID | FK to calendars |
+| `user_id` | UUID | Owner |
+| `title` | VARCHAR(500) | Event title |
+| `description` | TEXT | Event description |
+| `location` | VARCHAR(500) | Location |
+| `start_time` | TIMESTAMP | Start datetime |
+| `end_time` | TIMESTAMP | End datetime |
+| `is_all_day` | BOOLEAN | All-day flag |
+| `timezone` | VARCHAR(100) | Event timezone |
+| `recurrence_rule` | VARCHAR(500) | RFC 5545 RRULE |
+| `recurrence_end_date` | TIMESTAMP | End of recurrence |
+| `recurrence_exceptions` | JSONB | Exception dates |
+| `parent_event_id` | UUID | Parent for instances |
+| `color` | VARCHAR(7) | Override color |
+| `status` | VARCHAR(20) | confirmed/tentative/cancelled |
+| `external_id` | VARCHAR(255) | External calendar ID |
+| `metadata` | JSONB | Attendees, URL, etc. |
+| `created_at` | TIMESTAMP | Creation time |
+| `updated_at` | TIMESTAMP | Last update |
+
+#### calendar_shares
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `id` | UUID | Primary key |
+| `calendar_id` | UUID | FK to calendars |
+| `shared_with_user_id` | UUID | Target user (optional) |
+| `shared_with_email` | VARCHAR(255) | Email for invite |
+| `permission` | VARCHAR(20) | read/write/admin |
+| `share_token` | VARCHAR(64) | For link sharing |
+| `share_url` | VARCHAR(500) | Public share URL |
+| `status` | VARCHAR(20) | pending/accepted/declined |
+| `invited_by` | UUID | Inviter user ID |
+| `accepted_at` | TIMESTAMP | Accept timestamp |
+| `expires_at` | TIMESTAMP | Expiration date |
+| `created_at` | TIMESTAMP | Creation time |
+| `updated_at` | TIMESTAMP | Last update |
+
+#### reminders
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `id` | UUID | Primary key |
+| `event_id` | UUID | FK to events |
+| `user_id` | UUID | Owner |
+| `minutes_before` | INTEGER | Reminder offset |
+| `reminder_time` | TIMESTAMP | Calculated time |
+| `notify_push` | BOOLEAN | Push notification |
+| `notify_email` | BOOLEAN | Email notification |
+| `status` | VARCHAR(20) | pending/sent/failed |
+| `sent_at` | TIMESTAMP | Send timestamp |
+| `event_instance_date` | TIMESTAMP | For recurring events |
+| `created_at` | TIMESTAMP | Creation time |
+
+#### external_calendars
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `id` | UUID | Primary key |
+| `user_id` | UUID | Owner |
+| `name` | VARCHAR(255) | Display name |
+| `provider` | VARCHAR(50) | google/apple/caldav/ical_url |
+| `calendar_url` | TEXT | CalDAV or iCal URL |
+| `username` | VARCHAR(255) | CalDAV username |
+| `encrypted_password` | TEXT | Encrypted password |
+| `access_token` | TEXT | OAuth token |
+| `refresh_token` | TEXT | OAuth refresh token |
+| `token_expires_at` | TIMESTAMP | Token expiration |
+| `sync_enabled` | BOOLEAN | Sync toggle |
+| `sync_direction` | VARCHAR(20) | both/import/export |
+| `sync_interval` | INTEGER | Minutes between syncs |
+| `last_sync_at` | TIMESTAMP | Last sync time |
+| `last_sync_error` | TEXT | Error message |
+| `color` | VARCHAR(7) | Display color |
+| `is_visible` | BOOLEAN | Visibility in UI |
+| `provider_data` | JSONB | Provider-specific data |
+| `created_at` | TIMESTAMP | Creation time |
+| `updated_at` | TIMESTAMP | Last update |
+
+### Recurrence (RFC 5545 RRULE)
+
+Beispiele für wiederkehrende Termine:
+
+```
+FREQ=DAILY                           # Täglich
+FREQ=WEEKLY;BYDAY=MO,WE,FR           # Mo, Mi, Fr
+FREQ=WEEKLY;INTERVAL=2;BYDAY=TU      # Jeden 2. Dienstag
+FREQ=MONTHLY;BYMONTHDAY=15           # Am 15. jeden Monats
+FREQ=MONTHLY;BYDAY=2MO               # Am 2. Montag jeden Monats
+FREQ=YEARLY;BYMONTH=12;BYMONTHDAY=25 # Jährlich am 25.12.
+FREQ=DAILY;COUNT=10                  # Täglich, 10 mal
+FREQ=WEEKLY;UNTIL=20241231T235959Z   # Wöchentlich bis Ende 2024
+```
+
+## Environment Variables
+
+### Backend (.env)
+
+```env
+NODE_ENV=development
+PORT=3014
+DATABASE_URL=postgresql://manacore:devpassword@localhost:5432/calendar
+MANA_CORE_AUTH_URL=http://localhost:3001
+CORS_ORIGINS=http://localhost:5173,http://localhost:5179,http://localhost:8081
+
+# Notifications (optional)
+EXPO_ACCESS_TOKEN=your-expo-access-token
+RESEND_API_KEY=your-resend-api-key
+EMAIL_FROM=calendar@manacore.app
+```
+
+### Web (.env)
+
+```env
+PUBLIC_BACKEND_URL=http://localhost:3014
+PUBLIC_MANA_CORE_AUTH_URL=http://localhost:3001
+```
+
+### Mobile (.env)
+
+```env
+EXPO_PUBLIC_BACKEND_URL=http://localhost:3014
+EXPO_PUBLIC_MANA_CORE_AUTH_URL=http://localhost:3001
+```
+
+## Shared Packages
+
+### @calendar/shared
+
+**Types:**
+- `Calendar` - Kalender-Entity
+- `CalendarSettings` - Kalender-Einstellungen (JSONB)
+- `CalendarViewType` - 'day' | 'week' | 'month' | 'year' | 'agenda'
+- `Event` - Termin-Entity
+- `EventStatus` - 'confirmed' | 'tentative' | 'cancelled'
+- `Reminder` - Erinnerung-Entity
+- `ReminderStatus` - 'pending' | 'sent' | 'failed'
+- `CalendarShare` - Freigabe-Entity
+- `SharePermission` - 'read' | 'write' | 'admin'
+- `ExternalCalendar` - Externe Kalender-Entity
+
+**Constants:**
+- `DEFAULT_CALENDAR_COLORS` - 8 vordefinierte Farben
+- `DEFAULT_TIMEZONES` - Häufige Zeitzonen
+
+## Code Style Guidelines
+
+- **TypeScript**: Strict typing mit Interfaces
+- **Web**: Svelte 5 runes mode (`$state`, `$derived`, `$effect`)
+- **Styling**: Tailwind CSS mit CSS-Variablen
+- **Formatting**: Prettier mit Projekt-Config
+- **i18n**: Alle UI-Texte in Locale-Dateien
+
+### Svelte 5 Runes Beispiel
+
+```svelte
+<script lang="ts">
+  import { viewStore } from '$lib/stores/view.svelte';
+
+  // Reaktiver State
+  let loading = $state(false);
+
+  // Abgeleiteter Wert
+  let formattedDate = $derived(
+    format(viewStore.currentDate, 'MMMM yyyy', { locale: de })
+  );
+
+  // Side Effect
+  $effect(() => {
+    console.log('Date changed:', viewStore.currentDate);
+  });
+</script>
+```
+
+## Quick Start
+
+### 1. Datenbank erstellen
+
+```bash
+# PostgreSQL Container muss laufen
+docker compose -f docker-compose.dev.yml up -d postgres
+
+# Datenbank erstellen
+PGPASSWORD=devpassword psql -h localhost -U manacore -d postgres -c "CREATE DATABASE calendar;"
+
+# Schema pushen
+pnpm calendar:db:push
+```
+
+### 2. Apps starten
+
+```bash
+# Backend + Web zusammen
+pnpm dev:calendar:app
+
+# Oder einzeln:
+pnpm dev:calendar:backend  # Terminal 1
+pnpm dev:calendar:web      # Terminal 2
+pnpm dev:calendar:landing  # Terminal 3 (optional)
+```
+
+### 3. URLs öffnen
+
+- Web App: http://localhost:5179
+- Landing: http://localhost:4322
+- API Health: http://localhost:3014/api/v1/health
+
+## Testing API (mit curl)
+
+```bash
+# Health Check
+curl http://localhost:3014/api/v1/health
+
+# Login (get token)
+TOKEN=$(curl -s -X POST http://localhost:3001/api/v1/auth/login \
+  -H "Content-Type: application/json" \
+  -d '{"email": "test@example.com", "password": "password"}' | jq -r '.accessToken')
+
+# Kalender abrufen
+curl http://localhost:3014/api/v1/calendars \
+  -H "Authorization: Bearer $TOKEN"
+
+# Neuen Kalender erstellen
+curl -X POST http://localhost:3014/api/v1/calendars \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{"name": "Arbeit", "color": "#3B82F6"}'
+
+# Termine abrufen (Datumsbereich)
+curl "http://localhost:3014/api/v1/events?start=2024-12-01&end=2024-12-31" \
+  -H "Authorization: Bearer $TOKEN"
+
+# Neuen Termin erstellen
+curl -X POST http://localhost:3014/api/v1/events \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "calendarId": "calendar-uuid",
+    "title": "Meeting",
+    "startTime": "2024-12-15T10:00:00Z",
+    "endTime": "2024-12-15T11:00:00Z"
+  }'
+```
+
+## Roadmap / TODO
+
+- [ ] Mobile App (Expo)
+- [ ] Year View
+- [ ] CalDAV Sync Implementation
+- [ ] Push Notifications
+- [ ] E-Mail Reminders
+- [ ] Drag & Drop Events
+- [ ] Event Attendees
+- [ ] Calendar Import/Export
+- [ ] Offline Support
+- [ ] Dark/Light Theme in Landing
+
+## Important Notes
+
+1. **Authentication**: Nutzt Mana Core Auth (JWT im Authorization Header)
+2. **Database**: PostgreSQL mit Drizzle ORM (Port 5432)
+3. **Port**: Backend läuft auf Port 3014
+4. **Recurrence**: Verwendet RFC 5545 RRULE Format
+5. **i18n**: 5 Sprachen unterstützt (DE, EN, FR, ES, IT)
+6. **Theme**: Ocean-Theme (Blautöne) als Standard
diff --git a/apps/calendar/README.md b/apps/calendar/README.md
new file mode 100644
index 000000000..b2c714c2f
--- /dev/null
+++ b/apps/calendar/README.md
@@ -0,0 +1,79 @@
+# Kalender
+
+> Smart Calendar Management - Organisiere deine Zeit intelligent
+
+Eine vollständige Kalender-Anwendung mit persönlichen und geteilten Kalendern, wiederkehrenden Terminen, CalDAV/iCal-Synchronisation und Erinnerungen.
+
+## Features
+
+- **Mehrere Kalender** - Verwalte verschiedene Kalender für Arbeit, Privates, Familie
+- **Kalenderansichten** - Tag, Woche, Monat, Agenda
+- **Wiederkehrende Termine** - Flexible Wiederholungsregeln (RFC 5545)
+- **Kalender teilen** - Mit Familie, Freunden oder Kollegen
+- **CalDAV/iCal Sync** - Google Calendar, Apple, Outlook
+- **Smarte Erinnerungen** - Push & E-Mail Benachrichtigungen
+- **Multi-Sprache** - Deutsch, English, Français, Español, Italiano
+
+## Quick Start
+
+```bash
+# 1. PostgreSQL starten (falls nicht läuft)
+docker compose -f docker-compose.dev.yml up -d postgres
+
+# 2. Datenbank erstellen
+PGPASSWORD=devpassword psql -h localhost -U manacore -d postgres -c "CREATE DATABASE calendar;"
+
+# 3. Schema pushen
+pnpm calendar:db:push
+
+# 4. Backend + Web starten
+pnpm dev:calendar:app
+```
+
+## Apps
+
+| App | Port | Beschreibung |
+|-----|------|--------------|
+| [Backend](apps/backend) | 3014 | NestJS REST API |
+| [Web](apps/web) | 5179 | SvelteKit Web-App |
+| [Landing](apps/landing) | 4322 | Astro Marketing-Seite |
+| Mobile | - | Expo App (TODO) |
+
+## Tech Stack
+
+- **Backend**: NestJS, Drizzle ORM, PostgreSQL
+- **Web**: SvelteKit, Svelte 5, Tailwind CSS
+- **Landing**: Astro, Tailwind CSS
+- **Auth**: Mana Core Auth (JWT)
+
+## Dokumentation
+
+Siehe [CLAUDE.md](CLAUDE.md) für die vollständige technische Dokumentation.
+
+## Entwicklung
+
+```bash
+# Einzelne Apps starten
+pnpm dev:calendar:backend    # Backend
+pnpm dev:calendar:web        # Web-App
+pnpm dev:calendar:landing    # Landing Page
+
+# Datenbank
+pnpm calendar:db:push        # Schema pushen
+pnpm calendar:db:studio      # Drizzle Studio öffnen
+```
+
+## API Endpunkte
+
+| Modul | Endpunkt | Beschreibung |
+|-------|----------|--------------|
+| Health | `GET /api/v1/health` | Health Check |
+| Calendars | `GET/POST /api/v1/calendars` | Kalender CRUD |
+| Events | `GET/POST /api/v1/events` | Termine CRUD |
+| Reminders | `POST /api/v1/events/:id/reminders` | Erinnerungen |
+| Shares | `POST /api/v1/calendars/:id/shares` | Freigaben |
+| Sync | `POST /api/v1/sync/caldav/discover` | CalDAV |
+
+## Lizenz
+
+Proprietär - Manacore
diff --git a/apps/calendar/apps/backend/drizzle.config.ts b/apps/calendar/apps/backend/drizzle.config.ts
new file mode 100644
index 000000000..6379e67b7
--- /dev/null
+++ b/apps/calendar/apps/backend/drizzle.config.ts
@@ -0,0 +1,12 @@
+import { defineConfig } from 'drizzle-kit';
+
+export default defineConfig({
+	dialect: 'postgresql',
+	schema: './src/db/schema/index.ts',
+	out: './src/db/migrations',
+	dbCredentials: {
+		url: process.env.DATABASE_URL || 'postgresql://manacore:devpassword@localhost:5432/calendar',
+	},
+	verbose: true,
+	strict: true,
+});
diff --git a/apps/calendar/apps/backend/nest-cli.json b/apps/calendar/apps/backend/nest-cli.json
new file mode 100644
index 000000000..b4a4fa09c
--- /dev/null
+++ b/apps/calendar/apps/backend/nest-cli.json
@@ -0,0 +1,10 @@
+{
+	"$schema": "https://json.schemastore.org/nest-cli",
+	"collection": "@nestjs/schematics",
+	"sourceRoot": "src",
+	"compilerOptions": {
+		"deleteOutDir": false,
+		"assets": [],
+		"watchAssets": false
+	}
+}
diff --git a/apps/calendar/apps/backend/package.json b/apps/calendar/apps/backend/package.json
new file mode 100644
index 000000000..305e1f4cf
--- /dev/null
+++ b/apps/calendar/apps/backend/package.json
@@ -0,0 +1,57 @@
+{
+	"name": "@calendar/backend",
+	"version": "1.0.0",
+	"private": true,
+	"scripts": {
+		"build": "nest build",
+		"start": "nest start",
+		"dev": "nest start --watch",
+		"start:dev": "nest start --watch",
+		"start:debug": "nest start --debug --watch",
+		"start:prod": "node dist/main",
+		"lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
+		"type-check": "tsc --noEmit",
+		"migration:generate": "drizzle-kit generate",
+		"migration:run": "tsx src/db/migrate.ts",
+		"db:push": "drizzle-kit push",
+		"db:studio": "drizzle-kit studio",
+		"db:seed": "tsx src/db/seed.ts"
+	},
+	"dependencies": {
+		"@calendar/shared": "workspace:*",
+		"@manacore/shared-nestjs-auth": "workspace:*",
+		"@nestjs/common": "^10.4.15",
+		"@nestjs/config": "^3.3.0",
+		"@nestjs/core": "^10.4.15",
+		"@nestjs/platform-express": "^10.4.15",
+		"@nestjs/schedule": "^4.1.2",
+		"class-transformer": "^0.5.1",
+		"class-validator": "^0.14.1",
+		"dotenv": "^16.4.7",
+		"drizzle-kit": "^0.30.2",
+		"drizzle-orm": "^0.38.3",
+		"ical.js": "^2.1.0",
+		"postgres": "^3.4.5",
+		"reflect-metadata": "^0.2.2",
+		"rxjs": "^7.8.1",
+		"tsdav": "^2.1.1"
+	},
+	"devDependencies": {
+		"@nestjs/cli": "^10.4.9",
+		"@nestjs/schematics": "^10.2.3",
+		"@types/express": "^5.0.0",
+		"@types/node": "^22.10.2",
+		"@typescript-eslint/eslint-plugin": "^8.18.1",
+		"@typescript-eslint/parser": "^8.18.1",
+		"eslint": "^9.17.0",
+		"eslint-config-prettier": "^9.1.0",
+		"eslint-plugin-prettier": "^5.2.1",
+		"prettier": "^3.4.2",
+		"source-map-support": "^0.5.21",
+		"ts-loader": "^9.5.1",
+		"ts-node": "^10.9.2",
+		"tsconfig-paths": "^4.2.0",
+		"tsx": "^4.19.2",
+		"typescript": "^5.7.2"
+	}
+}
diff --git a/apps/calendar/apps/backend/src/app.module.ts b/apps/calendar/apps/backend/src/app.module.ts
new file mode 100644
index 000000000..cc315674e
--- /dev/null
+++ b/apps/calendar/apps/backend/src/app.module.ts
@@ -0,0 +1,26 @@
+import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { ScheduleModule } from '@nestjs/schedule';
+import { DatabaseModule } from './db/database.module';
+import { HealthModule } from './health/health.module';
+import { CalendarModule } from './calendar/calendar.module';
+import { EventModule } from './event/event.module';
+import { ReminderModule } from './reminder/reminder.module';
+import { ShareModule } from './share/share.module';
+
+@Module({
+	imports: [
+		ConfigModule.forRoot({
+			isGlobal: true,
+			envFilePath: '.env',
+		}),
+		ScheduleModule.forRoot(),
+		DatabaseModule,
+		HealthModule,
+		CalendarModule,
+		EventModule,
+		ReminderModule,
+		ShareModule,
+	],
+})
+export class AppModule {}
diff --git a/apps/calendar/apps/backend/src/calendar/calendar.controller.ts b/apps/calendar/apps/backend/src/calendar/calendar.controller.ts
new file mode 100644
index 000000000..54f19297d
--- /dev/null
+++ b/apps/calendar/apps/backend/src/calendar/calendar.controller.ts
@@ -0,0 +1,53 @@
+import {
+	Controller,
+	Get,
+	Post,
+	Put,
+	Delete,
+	Body,
+	Param,
+	UseGuards,
+} from '@nestjs/common';
+import { JwtAuthGuard, CurrentUser, CurrentUserData } from '@manacore/shared-nestjs-auth';
+import { CalendarService } from './calendar.service';
+import { CreateCalendarDto, UpdateCalendarDto } from './dto';
+
+@Controller('calendars')
+@UseGuards(JwtAuthGuard)
+export class CalendarController {
+	constructor(private readonly calendarService: CalendarService) {}
+
+	@Get()
+	async findAll(@CurrentUser() user: CurrentUserData) {
+		const calendars = await this.calendarService.findAll(user.userId);
+		return { calendars };
+	}
+
+	@Get(':id')
+	async findOne(@CurrentUser() user: CurrentUserData, @Param('id') id: string) {
+		const calendar = await this.calendarService.findByIdOrThrow(id, user.userId);
+		return { calendar };
+	}
+
+	@Post()
+	async create(@CurrentUser() user: CurrentUserData, @Body() dto: CreateCalendarDto) {
+		const calendar = await this.calendarService.create(user.userId, dto);
+		return { calendar };
+	}
+
+	@Put(':id')
+	async update(
+		@CurrentUser() user: CurrentUserData,
+		@Param('id') id: string,
+		@Body() dto: UpdateCalendarDto
+	) {
+		const calendar = await this.calendarService.update(id, user.userId, dto);
+		return { calendar };
+	}
+
+	@Delete(':id')
+	async delete(@CurrentUser() user: CurrentUserData, @Param('id') id: string) {
+		await this.calendarService.delete(id, user.userId);
+		return { success: true };
+	}
+}
diff --git a/apps/calendar/apps/backend/src/calendar/calendar.module.ts b/apps/calendar/apps/backend/src/calendar/calendar.module.ts
new file mode 100644
index 000000000..485b221d9
--- /dev/null
+++ b/apps/calendar/apps/backend/src/calendar/calendar.module.ts
@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { CalendarController } from './calendar.controller';
+import { CalendarService } from './calendar.service';
+
+@Module({
+	controllers: [CalendarController],
+	providers: [CalendarService],
+	exports: [CalendarService],
+})
+export class CalendarModule {}
diff --git a/apps/calendar/apps/backend/src/calendar/calendar.service.ts b/apps/calendar/apps/backend/src/calendar/calendar.service.ts
new file mode 100644
index 000000000..a7ae8cbd2
--- /dev/null
+++ b/apps/calendar/apps/backend/src/calendar/calendar.service.ts
@@ -0,0 +1,131 @@
+import { Injectable, Inject, NotFoundException } from '@nestjs/common';
+import { eq, and } from 'drizzle-orm';
+import { DATABASE_CONNECTION } from '../db/database.module';
+import { type Database } from '../db/connection';
+import { calendars, type Calendar, type NewCalendar } from '../db/schema/calendars.schema';
+import { CreateCalendarDto, UpdateCalendarDto } from './dto';
+
+@Injectable()
+export class CalendarService {
+	constructor(@Inject(DATABASE_CONNECTION) private db: Database) {}
+
+	async findAll(userId: string): Promise<Calendar[]> {
+		return this.db.select().from(calendars).where(eq(calendars.userId, userId));
+	}
+
+	async findById(id: string, userId: string): Promise<Calendar | null> {
+		const result = await this.db
+			.select()
+			.from(calendars)
+			.where(and(eq(calendars.id, id), eq(calendars.userId, userId)));
+		return result[0] || null;
+	}
+
+	async findByIdOrThrow(id: string, userId: string): Promise<Calendar> {
+		const calendar = await this.findById(id, userId);
+		if (!calendar) {
+			throw new NotFoundException(`Calendar with id ${id} not found`);
+		}
+		return calendar;
+	}
+
+	async create(userId: string, dto: CreateCalendarDto): Promise<Calendar> {
+		// If this is the first calendar or marked as default, handle default logic
+		if (dto.isDefault) {
+			await this.clearDefaultCalendar(userId);
+		}
+
+		const newCalendar: NewCalendar = {
+			userId,
+			name: dto.name,
+			description: dto.description,
+			color: dto.color || '#3B82F6',
+			isDefault: dto.isDefault ?? false,
+			isVisible: dto.isVisible ?? true,
+			timezone: dto.timezone || 'Europe/Berlin',
+			settings: dto.settings,
+		};
+
+		const [created] = await this.db.insert(calendars).values(newCalendar).returning();
+		return created;
+	}
+
+	async update(id: string, userId: string, dto: UpdateCalendarDto): Promise<Calendar> {
+		await this.findByIdOrThrow(id, userId);
+
+		// If setting as default, clear other defaults
+		if (dto.isDefault) {
+			await this.clearDefaultCalendar(userId);
+		}
+
+		const [updated] = await this.db
+			.update(calendars)
+			.set({
+				...dto,
+				updatedAt: new Date(),
+			})
+			.where(and(eq(calendars.id, id), eq(calendars.userId, userId)))
+			.returning();
+
+		return updated;
+	}
+
+	async delete(id: string, userId: string): Promise<void> {
+		const calendar = await this.findByIdOrThrow(id, userId);
+
+		// Don't allow deleting the default calendar if it's the only one
+		if (calendar.isDefault) {
+			const allCalendars = await this.findAll(userId);
+			if (allCalendars.length === 1) {
+				throw new Error('Cannot delete the only calendar');
+			}
+		}
+
+		await this.db
+			.delete(calendars)
+			.where(and(eq(calendars.id, id), eq(calendars.userId, userId)));
+	}
+
+	async getOrCreateDefaultCalendar(userId: string): Promise<Calendar> {
+		// Try to find existing default calendar
+		const existing = await this.db
+			.select()
+			.from(calendars)
+			.where(and(eq(calendars.userId, userId), eq(calendars.isDefault, true)));
+
+		if (existing.length > 0) {
+			return existing[0];
+		}
+
+		// Try to find any calendar
+		const anyCalendar = await this.db
+			.select()
+			.from(calendars)
+			.where(eq(calendars.userId, userId))
+			.limit(1);
+
+		if (anyCalendar.length > 0) {
+			// Make it the default
+			const [updated] = await this.db
+				.update(calendars)
+				.set({ isDefault: true, updatedAt: new Date() })
+				.where(eq(calendars.id, anyCalendar[0].id))
+				.returning();
+			return updated;
+		}
+
+		// Create a new default calendar
+		return this.create(userId, {
+			name: 'My Calendar',
+			isDefault: true,
+			color: '#3B82F6',
+		});
+	}
+
+	private async clearDefaultCalendar(userId: string): Promise<void> {
+		await this.db
+			.update(calendars)
+			.set({ isDefault: false, updatedAt: new Date() })
+			.where(and(eq(calendars.userId, userId), eq(calendars.isDefault, true)));
+	}
+}
diff --git a/apps/calendar/apps/backend/src/calendar/dto/create-calendar.dto.ts b/apps/calendar/apps/backend/src/calendar/dto/create-calendar.dto.ts
new file mode 100644
index 000000000..4e31b4967
--- /dev/null
+++ b/apps/calendar/apps/backend/src/calendar/dto/create-calendar.dto.ts
@@ -0,0 +1,34 @@
+import { IsString, IsOptional, IsBoolean, IsObject, MaxLength } from 'class-validator';
+import type { CalendarSettings } from '../../db/schema/calendars.schema';
+
+export class CreateCalendarDto {
+	@IsString()
+	@MaxLength(255)
+	name: string;
+
+	@IsOptional()
+	@IsString()
+	description?: string;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(7)
+	color?: string;
+
+	@IsOptional()
+	@IsBoolean()
+	isDefault?: boolean;
+
+	@IsOptional()
+	@IsBoolean()
+	isVisible?: boolean;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(100)
+	timezone?: string;
+
+	@IsOptional()
+	@IsObject()
+	settings?: CalendarSettings;
+}
diff --git a/apps/calendar/apps/backend/src/calendar/dto/index.ts b/apps/calendar/apps/backend/src/calendar/dto/index.ts
new file mode 100644
index 000000000..148a8248a
--- /dev/null
+++ b/apps/calendar/apps/backend/src/calendar/dto/index.ts
@@ -0,0 +1,2 @@
+export * from './create-calendar.dto';
+export * from './update-calendar.dto';
diff --git a/apps/calendar/apps/backend/src/calendar/dto/update-calendar.dto.ts b/apps/calendar/apps/backend/src/calendar/dto/update-calendar.dto.ts
new file mode 100644
index 000000000..48c962867
--- /dev/null
+++ b/apps/calendar/apps/backend/src/calendar/dto/update-calendar.dto.ts
@@ -0,0 +1,35 @@
+import { IsString, IsOptional, IsBoolean, IsObject, MaxLength } from 'class-validator';
+import type { CalendarSettings } from '../../db/schema/calendars.schema';
+
+export class UpdateCalendarDto {
+	@IsOptional()
+	@IsString()
+	@MaxLength(255)
+	name?: string;
+
+	@IsOptional()
+	@IsString()
+	description?: string | null;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(7)
+	color?: string;
+
+	@IsOptional()
+	@IsBoolean()
+	isDefault?: boolean;
+
+	@IsOptional()
+	@IsBoolean()
+	isVisible?: boolean;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(100)
+	timezone?: string;
+
+	@IsOptional()
+	@IsObject()
+	settings?: CalendarSettings;
+}
diff --git a/apps/calendar/apps/backend/src/db/connection.ts b/apps/calendar/apps/backend/src/db/connection.ts
new file mode 100644
index 000000000..fccc63f4a
--- /dev/null
+++ b/apps/calendar/apps/backend/src/db/connection.ts
@@ -0,0 +1,38 @@
+import { drizzle } from 'drizzle-orm/postgres-js';
+import * as schema from './schema';
+
+// Use require for postgres to avoid ESM/CommonJS interop issues
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const postgres = require('postgres');
+
+let connection: ReturnType<typeof postgres> | null = null;
+let db: ReturnType<typeof drizzle> | null = null;
+
+export function getConnection(databaseUrl: string) {
+	if (!connection) {
+		connection = postgres(databaseUrl, {
+			max: 10,
+			idle_timeout: 20,
+			connect_timeout: 10,
+		});
+	}
+	return connection;
+}
+
+export function getDb(databaseUrl: string) {
+	if (!db) {
+		const conn = getConnection(databaseUrl);
+		db = drizzle(conn, { schema });
+	}
+	return db;
+}
+
+export async function closeConnection() {
+	if (connection) {
+		await connection.end();
+		connection = null;
+		db = null;
+	}
+}
+
+export type Database = ReturnType<typeof getDb>;
diff --git a/apps/calendar/apps/backend/src/db/database.module.ts b/apps/calendar/apps/backend/src/db/database.module.ts
new file mode 100644
index 000000000..b4d1f2af6
--- /dev/null
+++ b/apps/calendar/apps/backend/src/db/database.module.ts
@@ -0,0 +1,28 @@
+import { Module, Global, OnModuleDestroy } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { getDb, closeConnection, type Database } from './connection';
+
+export const DATABASE_CONNECTION = 'DATABASE_CONNECTION';
+
+@Global()
+@Module({
+	providers: [
+		{
+			provide: DATABASE_CONNECTION,
+			useFactory: (configService: ConfigService): Database => {
+				const databaseUrl = configService.get<string>('DATABASE_URL');
+				if (!databaseUrl) {
+					throw new Error('DATABASE_URL environment variable is not set');
+				}
+				return getDb(databaseUrl);
+			},
+			inject: [ConfigService],
+		},
+	],
+	exports: [DATABASE_CONNECTION],
+})
+export class DatabaseModule implements OnModuleDestroy {
+	async onModuleDestroy() {
+		await closeConnection();
+	}
+}
diff --git a/apps/calendar/apps/backend/src/db/schema/calendar-shares.schema.ts b/apps/calendar/apps/backend/src/db/schema/calendar-shares.schema.ts
new file mode 100644
index 000000000..4383f3b1d
--- /dev/null
+++ b/apps/calendar/apps/backend/src/db/schema/calendar-shares.schema.ts
@@ -0,0 +1,42 @@
+import { pgTable, uuid, timestamp, varchar, unique } from 'drizzle-orm/pg-core';
+import { calendars } from './calendars.schema';
+
+/**
+ * Calendar shares table - stores calendar sharing information
+ */
+export const calendarShares = pgTable(
+	'calendar_shares',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		calendarId: uuid('calendar_id')
+			.notNull()
+			.references(() => calendars.id, { onDelete: 'cascade' }),
+		sharedWithUserId: uuid('shared_with_user_id'),
+		sharedWithEmail: varchar('shared_with_email', { length: 255 }),
+
+		// Permission level: read, write, admin
+		permission: varchar('permission', { length: 20 }).notNull().default('read'),
+
+		// Share link (for public/link sharing)
+		shareToken: varchar('share_token', { length: 64 }),
+		shareUrl: varchar('share_url', { length: 500 }),
+
+		// Status: pending, accepted, declined
+		status: varchar('status', { length: 20 }).default('pending'),
+
+		// Metadata
+		invitedBy: uuid('invited_by').notNull(),
+		acceptedAt: timestamp('accepted_at', { withTimezone: true }),
+		expiresAt: timestamp('expires_at', { withTimezone: true }),
+
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+		updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(table) => ({
+		uniqueUserShare: unique().on(table.calendarId, table.sharedWithUserId),
+		uniqueEmailShare: unique().on(table.calendarId, table.sharedWithEmail),
+	})
+);
+
+export type CalendarShare = typeof calendarShares.$inferSelect;
+export type NewCalendarShare = typeof calendarShares.$inferInsert;
diff --git a/apps/calendar/apps/backend/src/db/schema/calendars.schema.ts b/apps/calendar/apps/backend/src/db/schema/calendars.schema.ts
new file mode 100644
index 000000000..e4560be55
--- /dev/null
+++ b/apps/calendar/apps/backend/src/db/schema/calendars.schema.ts
@@ -0,0 +1,32 @@
+import { pgTable, uuid, timestamp, varchar, text, boolean, jsonb } from 'drizzle-orm/pg-core';
+
+/**
+ * Calendar settings stored in JSONB
+ */
+export interface CalendarSettings {
+	defaultView?: 'day' | 'week' | 'month' | 'year' | 'agenda';
+	weekStartsOn?: 0 | 1;
+	showWeekNumbers?: boolean;
+	defaultEventDuration?: number;
+	defaultReminder?: number;
+}
+
+/**
+ * Calendars table - stores user calendars
+ */
+export const calendars = pgTable('calendars', {
+	id: uuid('id').primaryKey().defaultRandom(),
+	userId: uuid('user_id').notNull(),
+	name: varchar('name', { length: 255 }).notNull(),
+	description: text('description'),
+	color: varchar('color', { length: 7 }).default('#3B82F6'),
+	isDefault: boolean('is_default').default(false),
+	isVisible: boolean('is_visible').default(true),
+	timezone: varchar('timezone', { length: 100 }).default('Europe/Berlin'),
+	settings: jsonb('settings').$type<CalendarSettings>(),
+	createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+	updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
+});
+
+export type Calendar = typeof calendars.$inferSelect;
+export type NewCalendar = typeof calendars.$inferInsert;
diff --git a/apps/calendar/apps/backend/src/db/schema/events.schema.ts b/apps/calendar/apps/backend/src/db/schema/events.schema.ts
new file mode 100644
index 000000000..bc6fa8952
--- /dev/null
+++ b/apps/calendar/apps/backend/src/db/schema/events.schema.ts
@@ -0,0 +1,80 @@
+import { pgTable, uuid, timestamp, varchar, text, boolean, jsonb, index } from 'drizzle-orm/pg-core';
+import { calendars } from './calendars.schema';
+
+/**
+ * Event attendee information
+ */
+export interface EventAttendee {
+	email: string;
+	name?: string;
+	status?: 'accepted' | 'declined' | 'tentative' | 'pending';
+}
+
+/**
+ * Event metadata stored in JSONB
+ */
+export interface EventMetadata {
+	url?: string;
+	conferenceUrl?: string;
+	attendees?: EventAttendee[];
+	organizer?: string;
+	priority?: 'low' | 'normal' | 'high';
+	tags?: string[];
+}
+
+/**
+ * Events table - stores calendar events
+ */
+export const events = pgTable(
+	'events',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		calendarId: uuid('calendar_id')
+			.notNull()
+			.references(() => calendars.id, { onDelete: 'cascade' }),
+		userId: uuid('user_id').notNull(),
+
+		// Basic info
+		title: varchar('title', { length: 500 }).notNull(),
+		description: text('description'),
+		location: varchar('location', { length: 500 }),
+
+		// Timing
+		startTime: timestamp('start_time', { withTimezone: true }).notNull(),
+		endTime: timestamp('end_time', { withTimezone: true }).notNull(),
+		isAllDay: boolean('is_all_day').default(false),
+		timezone: varchar('timezone', { length: 100 }).default('Europe/Berlin'),
+
+		// Recurrence (RFC 5545 RRULE format)
+		recurrenceRule: varchar('recurrence_rule', { length: 500 }),
+		recurrenceEndDate: timestamp('recurrence_end_date', { withTimezone: true }),
+		recurrenceExceptions: jsonb('recurrence_exceptions').$type<string[]>(),
+		parentEventId: uuid('parent_event_id'),
+
+		// Appearance
+		color: varchar('color', { length: 7 }),
+
+		// Status
+		status: varchar('status', { length: 20 }).default('confirmed'),
+
+		// External sync
+		externalId: varchar('external_id', { length: 255 }),
+		externalCalendarId: uuid('external_calendar_id'),
+		lastSyncedAt: timestamp('last_synced_at', { withTimezone: true }),
+
+		// Metadata
+		metadata: jsonb('metadata').$type<EventMetadata>(),
+
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+		updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(table) => ({
+		calendarIdx: index('events_calendar_idx').on(table.calendarId),
+		userIdx: index('events_user_idx').on(table.userId),
+		timeRangeIdx: index('events_time_range_idx').on(table.startTime, table.endTime),
+		externalIdx: index('events_external_idx').on(table.externalId, table.externalCalendarId),
+	})
+);
+
+export type Event = typeof events.$inferSelect;
+export type NewEvent = typeof events.$inferInsert;
diff --git a/apps/calendar/apps/backend/src/db/schema/external-calendars.schema.ts b/apps/calendar/apps/backend/src/db/schema/external-calendars.schema.ts
new file mode 100644
index 000000000..218a7b682
--- /dev/null
+++ b/apps/calendar/apps/backend/src/db/schema/external-calendars.schema.ts
@@ -0,0 +1,56 @@
+import { pgTable, uuid, timestamp, varchar, text, boolean, jsonb, integer } from 'drizzle-orm/pg-core';
+
+/**
+ * Provider-specific metadata
+ */
+export interface ExternalCalendarProviderData {
+	googleCalendarId?: string;
+	appleCalendarId?: string;
+	caldavCalendarId?: string;
+	caldavEtag?: string;
+	caldavCtag?: string;
+	icalLastModified?: string;
+	icalEtag?: string;
+}
+
+/**
+ * External calendars table - stores CalDAV/iCal connections
+ */
+export const externalCalendars = pgTable('external_calendars', {
+	id: uuid('id').primaryKey().defaultRandom(),
+	userId: uuid('user_id').notNull(),
+
+	// Calendar identification
+	name: varchar('name', { length: 255 }).notNull(),
+	provider: varchar('provider', { length: 50 }).notNull(), // google, apple, caldav, ical_url
+
+	// Connection details
+	calendarUrl: text('calendar_url').notNull(),
+	username: varchar('username', { length: 255 }),
+	encryptedPassword: text('encrypted_password'),
+
+	// OAuth tokens (for Google, etc.)
+	accessToken: text('access_token'),
+	refreshToken: text('refresh_token'),
+	tokenExpiresAt: timestamp('token_expires_at', { withTimezone: true }),
+
+	// Sync settings
+	syncEnabled: boolean('sync_enabled').default(true),
+	syncDirection: varchar('sync_direction', { length: 20 }).default('both'), // import, export, both
+	syncInterval: integer('sync_interval').default(15), // Minutes between syncs
+	lastSyncAt: timestamp('last_sync_at', { withTimezone: true }),
+	lastSyncError: text('last_sync_error'),
+
+	// Display settings
+	color: varchar('color', { length: 7 }).default('#6B7280'),
+	isVisible: boolean('is_visible').default(true),
+
+	// Provider-specific metadata
+	providerData: jsonb('provider_data').$type<ExternalCalendarProviderData>(),
+
+	createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+	updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
+});
+
+export type ExternalCalendar = typeof externalCalendars.$inferSelect;
+export type NewExternalCalendar = typeof externalCalendars.$inferInsert;
diff --git a/apps/calendar/apps/backend/src/db/schema/index.ts b/apps/calendar/apps/backend/src/db/schema/index.ts
new file mode 100644
index 000000000..a61f7006f
--- /dev/null
+++ b/apps/calendar/apps/backend/src/db/schema/index.ts
@@ -0,0 +1,6 @@
+// Calendar Database Schemas
+export * from './calendars.schema';
+export * from './events.schema';
+export * from './calendar-shares.schema';
+export * from './reminders.schema';
+export * from './external-calendars.schema';
diff --git a/apps/calendar/apps/backend/src/db/schema/reminders.schema.ts b/apps/calendar/apps/backend/src/db/schema/reminders.schema.ts
new file mode 100644
index 000000000..45ec1eb54
--- /dev/null
+++ b/apps/calendar/apps/backend/src/db/schema/reminders.schema.ts
@@ -0,0 +1,41 @@
+import { pgTable, uuid, timestamp, varchar, integer, boolean, index } from 'drizzle-orm/pg-core';
+import { events } from './events.schema';
+
+/**
+ * Reminders table - stores event reminders
+ */
+export const reminders = pgTable(
+	'reminders',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		eventId: uuid('event_id')
+			.notNull()
+			.references(() => events.id, { onDelete: 'cascade' }),
+		userId: uuid('user_id').notNull(),
+
+		// Timing
+		minutesBefore: integer('minutes_before').notNull(),
+		reminderTime: timestamp('reminder_time', { withTimezone: true }).notNull(),
+
+		// Notification channels
+		notifyPush: boolean('notify_push').default(true),
+		notifyEmail: boolean('notify_email').default(false),
+
+		// Status: pending, sent, failed, cancelled
+		status: varchar('status', { length: 20 }).default('pending'),
+		sentAt: timestamp('sent_at', { withTimezone: true }),
+
+		// For recurring events - which instance this reminder is for
+		eventInstanceDate: timestamp('event_instance_date', { withTimezone: true }),
+
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(table) => ({
+		eventIdx: index('reminders_event_idx').on(table.eventId),
+		userIdx: index('reminders_user_idx').on(table.userId),
+		pendingIdx: index('reminders_pending_idx').on(table.status, table.reminderTime),
+	})
+);
+
+export type Reminder = typeof reminders.$inferSelect;
+export type NewReminder = typeof reminders.$inferInsert;
diff --git a/apps/calendar/apps/backend/src/event/dto/create-event.dto.ts b/apps/calendar/apps/backend/src/event/dto/create-event.dto.ts
new file mode 100644
index 000000000..590d4a6ce
--- /dev/null
+++ b/apps/calendar/apps/backend/src/event/dto/create-event.dto.ts
@@ -0,0 +1,66 @@
+import {
+	IsString,
+	IsOptional,
+	IsBoolean,
+	IsObject,
+	IsDateString,
+	IsUUID,
+	IsIn,
+	MaxLength,
+} from 'class-validator';
+import type { EventMetadata } from '../../db/schema/events.schema';
+
+export class CreateEventDto {
+	@IsUUID()
+	calendarId: string;
+
+	@IsString()
+	@MaxLength(500)
+	title: string;
+
+	@IsOptional()
+	@IsString()
+	description?: string;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(500)
+	location?: string;
+
+	@IsDateString()
+	startTime: string;
+
+	@IsDateString()
+	endTime: string;
+
+	@IsOptional()
+	@IsBoolean()
+	isAllDay?: boolean;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(100)
+	timezone?: string;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(500)
+	recurrenceRule?: string;
+
+	@IsOptional()
+	@IsDateString()
+	recurrenceEndDate?: string;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(7)
+	color?: string;
+
+	@IsOptional()
+	@IsIn(['confirmed', 'tentative', 'cancelled'])
+	status?: 'confirmed' | 'tentative' | 'cancelled';
+
+	@IsOptional()
+	@IsObject()
+	metadata?: EventMetadata;
+}
diff --git a/apps/calendar/apps/backend/src/event/dto/index.ts b/apps/calendar/apps/backend/src/event/dto/index.ts
new file mode 100644
index 000000000..ed3180c2d
--- /dev/null
+++ b/apps/calendar/apps/backend/src/event/dto/index.ts
@@ -0,0 +1,3 @@
+export * from './create-event.dto';
+export * from './update-event.dto';
+export * from './query-events.dto';
diff --git a/apps/calendar/apps/backend/src/event/dto/query-events.dto.ts b/apps/calendar/apps/backend/src/event/dto/query-events.dto.ts
new file mode 100644
index 000000000..6df545800
--- /dev/null
+++ b/apps/calendar/apps/backend/src/event/dto/query-events.dto.ts
@@ -0,0 +1,27 @@
+import { IsOptional, IsDateString, IsArray, IsBoolean, IsString } from 'class-validator';
+import { Transform } from 'class-transformer';
+
+export class QueryEventsDto {
+	@IsOptional()
+	@IsDateString()
+	startDate?: string;
+
+	@IsOptional()
+	@IsDateString()
+	endDate?: string;
+
+	@IsOptional()
+	@IsArray()
+	@IsString({ each: true })
+	@Transform(({ value }) => (typeof value === 'string' ? value.split(',') : value))
+	calendarIds?: string[];
+
+	@IsOptional()
+	@IsBoolean()
+	@Transform(({ value }) => value === 'true' || value === true)
+	includeCancelled?: boolean;
+
+	@IsOptional()
+	@IsString()
+	search?: string;
+}
diff --git a/apps/calendar/apps/backend/src/event/dto/update-event.dto.ts b/apps/calendar/apps/backend/src/event/dto/update-event.dto.ts
new file mode 100644
index 000000000..c3b44dbfe
--- /dev/null
+++ b/apps/calendar/apps/backend/src/event/dto/update-event.dto.ts
@@ -0,0 +1,76 @@
+import {
+	IsString,
+	IsOptional,
+	IsBoolean,
+	IsObject,
+	IsDateString,
+	IsUUID,
+	IsIn,
+	IsArray,
+	MaxLength,
+} from 'class-validator';
+import type { EventMetadata } from '../../db/schema/events.schema';
+
+export class UpdateEventDto {
+	@IsOptional()
+	@IsUUID()
+	calendarId?: string;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(500)
+	title?: string;
+
+	@IsOptional()
+	@IsString()
+	description?: string | null;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(500)
+	location?: string | null;
+
+	@IsOptional()
+	@IsDateString()
+	startTime?: string;
+
+	@IsOptional()
+	@IsDateString()
+	endTime?: string;
+
+	@IsOptional()
+	@IsBoolean()
+	isAllDay?: boolean;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(100)
+	timezone?: string;
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(500)
+	recurrenceRule?: string | null;
+
+	@IsOptional()
+	@IsDateString()
+	recurrenceEndDate?: string | null;
+
+	@IsOptional()
+	@IsArray()
+	@IsString({ each: true })
+	recurrenceExceptions?: string[];
+
+	@IsOptional()
+	@IsString()
+	@MaxLength(7)
+	color?: string | null;
+
+	@IsOptional()
+	@IsIn(['confirmed', 'tentative', 'cancelled'])
+	status?: 'confirmed' | 'tentative' | 'cancelled';
+
+	@IsOptional()
+	@IsObject()
+	metadata?: EventMetadata;
+}
diff --git a/apps/calendar/apps/backend/src/event/event.controller.ts b/apps/calendar/apps/backend/src/event/event.controller.ts
new file mode 100644
index 000000000..15c816779
--- /dev/null
+++ b/apps/calendar/apps/backend/src/event/event.controller.ts
@@ -0,0 +1,64 @@
+import {
+	Controller,
+	Get,
+	Post,
+	Put,
+	Delete,
+	Body,
+	Param,
+	Query,
+	UseGuards,
+} from '@nestjs/common';
+import { JwtAuthGuard, CurrentUser, CurrentUserData } from '@manacore/shared-nestjs-auth';
+import { EventService } from './event.service';
+import { CreateEventDto, UpdateEventDto, QueryEventsDto } from './dto';
+
+@Controller('events')
+@UseGuards(JwtAuthGuard)
+export class EventController {
+	constructor(private readonly eventService: EventService) {}
+
+	@Get()
+	async queryEvents(@CurrentUser() user: CurrentUserData, @Query() query: QueryEventsDto) {
+		const events = await this.eventService.getEventsWithCalendar(user.userId, query);
+		return { events };
+	}
+
+	@Get(':id')
+	async findOne(@CurrentUser() user: CurrentUserData, @Param('id') id: string) {
+		const event = await this.eventService.findByIdOrThrow(id, user.userId);
+		return { event };
+	}
+
+	@Get('calendar/:calendarId')
+	async findByCalendar(
+		@CurrentUser() user: CurrentUserData,
+		@Param('calendarId') calendarId: string,
+		@Query() query: QueryEventsDto
+	) {
+		const events = await this.eventService.findByCalendar(calendarId, user.userId, query);
+		return { events };
+	}
+
+	@Post()
+	async create(@CurrentUser() user: CurrentUserData, @Body() dto: CreateEventDto) {
+		const event = await this.eventService.create(user.userId, dto);
+		return { event };
+	}
+
+	@Put(':id')
+	async update(
+		@CurrentUser() user: CurrentUserData,
+		@Param('id') id: string,
+		@Body() dto: UpdateEventDto
+	) {
+		const event = await this.eventService.update(id, user.userId, dto);
+		return { event };
+	}
+
+	@Delete(':id')
+	async delete(@CurrentUser() user: CurrentUserData, @Param('id') id: string) {
+		await this.eventService.delete(id, user.userId);
+		return { success: true };
+	}
+}
diff --git a/apps/calendar/apps/backend/src/event/event.module.ts b/apps/calendar/apps/backend/src/event/event.module.ts
new file mode 100644
index 000000000..24625ca2d
--- /dev/null
+++ b/apps/calendar/apps/backend/src/event/event.module.ts
@@ -0,0 +1,12 @@
+import { Module } from '@nestjs/common';
+import { EventController } from './event.controller';
+import { EventService } from './event.service';
+import { CalendarModule } from '../calendar/calendar.module';
+
+@Module({
+	imports: [CalendarModule],
+	controllers: [EventController],
+	providers: [EventService],
+	exports: [EventService],
+})
+export class EventModule {}
diff --git a/apps/calendar/apps/backend/src/event/event.service.ts b/apps/calendar/apps/backend/src/event/event.service.ts
new file mode 100644
index 000000000..87c08a840
--- /dev/null
+++ b/apps/calendar/apps/backend/src/event/event.service.ts
@@ -0,0 +1,183 @@
+import { Injectable, Inject, NotFoundException, ForbiddenException } from '@nestjs/common';
+import { eq, and, gte, lte, inArray, or, ilike } from 'drizzle-orm';
+import { DATABASE_CONNECTION } from '../db/database.module';
+import { type Database } from '../db/connection';
+import { events, type Event, type NewEvent } from '../db/schema/events.schema';
+import { calendars } from '../db/schema/calendars.schema';
+import { CalendarService } from '../calendar/calendar.service';
+import { CreateEventDto, UpdateEventDto, QueryEventsDto } from './dto';
+
+@Injectable()
+export class EventService {
+	constructor(
+		@Inject(DATABASE_CONNECTION) private db: Database,
+		private calendarService: CalendarService
+	) {}
+
+	async queryEvents(userId: string, query: QueryEventsDto): Promise<Event[]> {
+		const conditions = [eq(events.userId, userId)];
+
+		// Date range filter
+		if (query.startDate) {
+			conditions.push(gte(events.endTime, new Date(query.startDate)));
+		}
+		if (query.endDate) {
+			conditions.push(lte(events.startTime, new Date(query.endDate)));
+		}
+
+		// Calendar filter
+		if (query.calendarIds && query.calendarIds.length > 0) {
+			conditions.push(inArray(events.calendarId, query.calendarIds));
+		}
+
+		// Exclude cancelled unless requested
+		if (!query.includeCancelled) {
+			conditions.push(
+				or(eq(events.status, 'confirmed'), eq(events.status, 'tentative')) as any
+			);
+		}
+
+		// Search filter
+		if (query.search) {
+			conditions.push(
+				or(
+					ilike(events.title, `%${query.search}%`),
+					ilike(events.description, `%${query.search}%`)
+				) as any
+			);
+		}
+
+		return this.db
+			.select()
+			.from(events)
+			.where(and(...conditions))
+			.orderBy(events.startTime);
+	}
+
+	async findById(id: string, userId: string): Promise<Event | null> {
+		const result = await this.db
+			.select()
+			.from(events)
+			.where(and(eq(events.id, id), eq(events.userId, userId)));
+		return result[0] || null;
+	}
+
+	async findByIdOrThrow(id: string, userId: string): Promise<Event> {
+		const event = await this.findById(id, userId);
+		if (!event) {
+			throw new NotFoundException(`Event with id ${id} not found`);
+		}
+		return event;
+	}
+
+	async findByCalendar(
+		calendarId: string,
+		userId: string,
+		query: QueryEventsDto
+	): Promise<Event[]> {
+		// Verify user owns the calendar
+		await this.calendarService.findByIdOrThrow(calendarId, userId);
+
+		return this.queryEvents(userId, {
+			...query,
+			calendarIds: [calendarId],
+		});
+	}
+
+	async create(userId: string, dto: CreateEventDto): Promise<Event> {
+		// Verify user owns the calendar
+		const calendar = await this.calendarService.findByIdOrThrow(dto.calendarId, userId);
+
+		const newEvent: NewEvent = {
+			calendarId: dto.calendarId,
+			userId,
+			title: dto.title,
+			description: dto.description,
+			location: dto.location,
+			startTime: new Date(dto.startTime),
+			endTime: new Date(dto.endTime),
+			isAllDay: dto.isAllDay ?? false,
+			timezone: dto.timezone || calendar.timezone || 'Europe/Berlin',
+			recurrenceRule: dto.recurrenceRule,
+			recurrenceEndDate: dto.recurrenceEndDate ? new Date(dto.recurrenceEndDate) : undefined,
+			color: dto.color,
+			status: dto.status || 'confirmed',
+			metadata: dto.metadata,
+		};
+
+		const [created] = await this.db.insert(events).values(newEvent).returning();
+		return created;
+	}
+
+	async update(id: string, userId: string, dto: UpdateEventDto): Promise<Event> {
+		const existingEvent = await this.findByIdOrThrow(id, userId);
+
+		// If changing calendar, verify user owns the new calendar
+		if (dto.calendarId && dto.calendarId !== existingEvent.calendarId) {
+			await this.calendarService.findByIdOrThrow(dto.calendarId, userId);
+		}
+
+		const updateData: Partial<NewEvent> = {
+			...dto,
+			startTime: dto.startTime ? new Date(dto.startTime) : undefined,
+			endTime: dto.endTime ? new Date(dto.endTime) : undefined,
+			recurrenceEndDate: dto.recurrenceEndDate ? new Date(dto.recurrenceEndDate) : undefined,
+			updatedAt: new Date(),
+		};
+
+		// Remove undefined values
+		Object.keys(updateData).forEach((key) => {
+			if (updateData[key as keyof typeof updateData] === undefined) {
+				delete updateData[key as keyof typeof updateData];
+			}
+		});
+
+		const [updated] = await this.db
+			.update(events)
+			.set(updateData)
+			.where(and(eq(events.id, id), eq(events.userId, userId)))
+			.returning();
+
+		return updated;
+	}
+
+	async delete(id: string, userId: string): Promise<void> {
+		await this.findByIdOrThrow(id, userId);
+
+		await this.db.delete(events).where(and(eq(events.id, id), eq(events.userId, userId)));
+	}
+
+	async getEventsWithCalendar(userId: string, query: QueryEventsDto) {
+		const conditions = [eq(events.userId, userId)];
+
+		if (query.startDate) {
+			conditions.push(gte(events.endTime, new Date(query.startDate)));
+		}
+		if (query.endDate) {
+			conditions.push(lte(events.startTime, new Date(query.endDate)));
+		}
+
+		if (query.calendarIds && query.calendarIds.length > 0) {
+			conditions.push(inArray(events.calendarId, query.calendarIds));
+		}
+
+		const result = await this.db
+			.select({
+				event: events,
+				calendar: {
+					id: calendars.id,
+					name: calendars.name,
+					color: calendars.color,
+				},
+			})
+			.from(events)
+			.leftJoin(calendars, eq(events.calendarId, calendars.id))
+			.where(and(...conditions))
+			.orderBy(events.startTime);
+
+		return result.map((r) => ({
+			...r.event,
+			calendar: r.calendar,
+		}));
+	}
+}
diff --git a/apps/calendar/apps/backend/src/health/health.controller.ts b/apps/calendar/apps/backend/src/health/health.controller.ts
new file mode 100644
index 000000000..e5356ee24
--- /dev/null
+++ b/apps/calendar/apps/backend/src/health/health.controller.ts
@@ -0,0 +1,13 @@
+import { Controller, Get } from '@nestjs/common';
+
+@Controller('health')
+export class HealthController {
+	@Get()
+	check() {
+		return {
+			status: 'ok',
+			service: 'calendar-backend',
+			timestamp: new Date().toISOString(),
+		};
+	}
+}
diff --git a/apps/calendar/apps/backend/src/health/health.module.ts b/apps/calendar/apps/backend/src/health/health.module.ts
new file mode 100644
index 000000000..a61d8b044
--- /dev/null
+++ b/apps/calendar/apps/backend/src/health/health.module.ts
@@ -0,0 +1,7 @@
+import { Module } from '@nestjs/common';
+import { HealthController } from './health.controller';
+
+@Module({
+	controllers: [HealthController],
+})
+export class HealthModule {}
diff --git a/apps/calendar/apps/backend/src/main.ts b/apps/calendar/apps/backend/src/main.ts
new file mode 100644
index 000000000..9efe3d430
--- /dev/null
+++ b/apps/calendar/apps/backend/src/main.ts
@@ -0,0 +1,40 @@
+import { NestFactory } from '@nestjs/core';
+import { ValidationPipe } from '@nestjs/common';
+import { AppModule } from './app.module';
+
+async function bootstrap() {
+	const app = await NestFactory.create(AppModule);
+
+	// Enable CORS for mobile and web apps
+	const corsOrigins = process.env.CORS_ORIGINS?.split(',').map((origin) => origin.trim()) || [
+		'http://localhost:3000',
+		'http://localhost:5173',
+		'http://localhost:5179',
+		'http://localhost:8081',
+		'exp://localhost:8081',
+		'http://localhost:3001',
+	];
+
+	app.enableCors({
+		origin: corsOrigins,
+		methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
+		credentials: true,
+	});
+
+	// Enable validation
+	app.useGlobalPipes(
+		new ValidationPipe({
+			whitelist: true,
+			transform: true,
+			forbidNonWhitelisted: true,
+		})
+	);
+
+	// Set global prefix for API routes
+	app.setGlobalPrefix('api/v1');
+
+	const port = process.env.PORT || 3014;
+	await app.listen(port);
+	console.log(`Calendar backend running on http://localhost:${port}`);
+}
+bootstrap();
diff --git a/apps/calendar/apps/backend/src/reminder/dto/create-reminder.dto.ts b/apps/calendar/apps/backend/src/reminder/dto/create-reminder.dto.ts
new file mode 100644
index 000000000..7176cea80
--- /dev/null
+++ b/apps/calendar/apps/backend/src/reminder/dto/create-reminder.dto.ts
@@ -0,0 +1,19 @@
+import { IsUUID, IsInt, IsOptional, IsBoolean, Min, Max } from 'class-validator';
+
+export class CreateReminderDto {
+	@IsUUID()
+	eventId: string;
+
+	@IsInt()
+	@Min(0)
+	@Max(10080) // Max 1 week in minutes
+	minutesBefore: number;
+
+	@IsOptional()
+	@IsBoolean()
+	notifyPush?: boolean;
+
+	@IsOptional()
+	@IsBoolean()
+	notifyEmail?: boolean;
+}
diff --git a/apps/calendar/apps/backend/src/reminder/dto/index.ts b/apps/calendar/apps/backend/src/reminder/dto/index.ts
new file mode 100644
index 000000000..0f64a4857
--- /dev/null
+++ b/apps/calendar/apps/backend/src/reminder/dto/index.ts
@@ -0,0 +1 @@
+export * from './create-reminder.dto';
diff --git a/apps/calendar/apps/backend/src/reminder/reminder.controller.ts b/apps/calendar/apps/backend/src/reminder/reminder.controller.ts
new file mode 100644
index 000000000..fa3256290
--- /dev/null
+++ b/apps/calendar/apps/backend/src/reminder/reminder.controller.ts
@@ -0,0 +1,46 @@
+import {
+	Controller,
+	Get,
+	Post,
+	Delete,
+	Body,
+	Param,
+	UseGuards,
+} from '@nestjs/common';
+import { JwtAuthGuard, CurrentUser, CurrentUserData } from '@manacore/shared-nestjs-auth';
+import { ReminderService } from './reminder.service';
+import { CreateReminderDto } from './dto';
+
+@Controller()
+@UseGuards(JwtAuthGuard)
+export class ReminderController {
+	constructor(private readonly reminderService: ReminderService) {}
+
+	@Get('events/:eventId/reminders')
+	async findByEvent(
+		@CurrentUser() user: CurrentUserData,
+		@Param('eventId') eventId: string
+	) {
+		const reminders = await this.reminderService.findByEvent(eventId, user.userId);
+		return { reminders };
+	}
+
+	@Post('events/:eventId/reminders')
+	async create(
+		@CurrentUser() user: CurrentUserData,
+		@Param('eventId') eventId: string,
+		@Body() dto: Omit<CreateReminderDto, 'eventId'>
+	) {
+		const reminder = await this.reminderService.create(user.userId, {
+			...dto,
+			eventId,
+		});
+		return { reminder };
+	}
+
+	@Delete('reminders/:id')
+	async delete(@CurrentUser() user: CurrentUserData, @Param('id') id: string) {
+		await this.reminderService.delete(id, user.userId);
+		return { success: true };
+	}
+}
diff --git a/apps/calendar/apps/backend/src/reminder/reminder.module.ts b/apps/calendar/apps/backend/src/reminder/reminder.module.ts
new file mode 100644
index 000000000..6edb2966c
--- /dev/null
+++ b/apps/calendar/apps/backend/src/reminder/reminder.module.ts
@@ -0,0 +1,12 @@
+import { Module } from '@nestjs/common';
+import { ReminderController } from './reminder.controller';
+import { ReminderService } from './reminder.service';
+import { EventModule } from '../event/event.module';
+
+@Module({
+	imports: [EventModule],
+	controllers: [ReminderController],
+	providers: [ReminderService],
+	exports: [ReminderService],
+})
+export class ReminderModule {}
diff --git a/apps/calendar/apps/backend/src/reminder/reminder.service.ts b/apps/calendar/apps/backend/src/reminder/reminder.service.ts
new file mode 100644
index 000000000..304796598
--- /dev/null
+++ b/apps/calendar/apps/backend/src/reminder/reminder.service.ts
@@ -0,0 +1,158 @@
+import { Injectable, Inject, NotFoundException } from '@nestjs/common';
+import { Cron, CronExpression } from '@nestjs/schedule';
+import { eq, and, lte } from 'drizzle-orm';
+import { DATABASE_CONNECTION } from '../db/database.module';
+import { type Database } from '../db/connection';
+import { reminders, type Reminder, type NewReminder } from '../db/schema/reminders.schema';
+import { events } from '../db/schema/events.schema';
+import { EventService } from '../event/event.service';
+import { CreateReminderDto } from './dto';
+
+@Injectable()
+export class ReminderService {
+	constructor(
+		@Inject(DATABASE_CONNECTION) private db: Database,
+		private eventService: EventService
+	) {}
+
+	async findByEvent(eventId: string, userId: string): Promise<Reminder[]> {
+		// Verify user owns the event
+		await this.eventService.findByIdOrThrow(eventId, userId);
+
+		return this.db
+			.select()
+			.from(reminders)
+			.where(and(eq(reminders.eventId, eventId), eq(reminders.userId, userId)));
+	}
+
+	async findById(id: string, userId: string): Promise<Reminder | null> {
+		const result = await this.db
+			.select()
+			.from(reminders)
+			.where(and(eq(reminders.id, id), eq(reminders.userId, userId)));
+		return result[0] || null;
+	}
+
+	async create(userId: string, dto: CreateReminderDto): Promise<Reminder> {
+		// Verify user owns the event and get event details
+		const event = await this.eventService.findByIdOrThrow(dto.eventId, userId);
+
+		// Calculate reminder time
+		const eventStartTime = new Date(event.startTime);
+		const reminderTime = new Date(eventStartTime.getTime() - dto.minutesBefore * 60 * 1000);
+
+		const newReminder: NewReminder = {
+			eventId: dto.eventId,
+			userId,
+			minutesBefore: dto.minutesBefore,
+			reminderTime,
+			notifyPush: dto.notifyPush ?? true,
+			notifyEmail: dto.notifyEmail ?? false,
+			status: 'pending',
+		};
+
+		const [created] = await this.db.insert(reminders).values(newReminder).returning();
+		return created;
+	}
+
+	async delete(id: string, userId: string): Promise<void> {
+		const reminder = await this.findById(id, userId);
+		if (!reminder) {
+			throw new NotFoundException(`Reminder with id ${id} not found`);
+		}
+
+		await this.db
+			.delete(reminders)
+			.where(and(eq(reminders.id, id), eq(reminders.userId, userId)));
+	}
+
+	async getPendingReminders(): Promise<Reminder[]> {
+		const now = new Date();
+		// Get reminders that are due within the next minute
+		const oneMinuteFromNow = new Date(now.getTime() + 60 * 1000);
+
+		return this.db
+			.select()
+			.from(reminders)
+			.where(
+				and(eq(reminders.status, 'pending'), lte(reminders.reminderTime, oneMinuteFromNow))
+			);
+	}
+
+	async markAsSent(id: string): Promise<void> {
+		await this.db
+			.update(reminders)
+			.set({ status: 'sent', sentAt: new Date() })
+			.where(eq(reminders.id, id));
+	}
+
+	async markAsFailed(id: string, error: string): Promise<void> {
+		await this.db.update(reminders).set({ status: 'failed' }).where(eq(reminders.id, id));
+		console.error(`Reminder ${id} failed:`, error);
+	}
+
+	/**
+	 * Process pending reminders every minute
+	 * In production, this would send push notifications and emails
+	 */
+	@Cron(CronExpression.EVERY_MINUTE)
+	async processReminders() {
+		const pendingReminders = await this.getPendingReminders();
+
+		for (const reminder of pendingReminders) {
+			try {
+				// Get event details for the notification
+				const eventResult = await this.db
+					.select()
+					.from(events)
+					.where(eq(events.id, reminder.eventId));
+
+				if (eventResult.length === 0) {
+					await this.markAsFailed(reminder.id, 'Event not found');
+					continue;
+				}
+
+				const event = eventResult[0];
+
+				// TODO: Implement actual notification sending
+				// For now, just log and mark as sent
+				console.log(`[Reminder] Event "${event.title}" starting in ${reminder.minutesBefore} minutes`);
+
+				if (reminder.notifyPush) {
+					// TODO: Send push notification via Expo Push API
+					console.log(`  - Would send push notification to user ${reminder.userId}`);
+				}
+
+				if (reminder.notifyEmail) {
+					// TODO: Send email notification
+					console.log(`  - Would send email to user ${reminder.userId}`);
+				}
+
+				await this.markAsSent(reminder.id);
+			} catch (error) {
+				await this.markAsFailed(reminder.id, (error as Error).message);
+			}
+		}
+	}
+
+	/**
+	 * Update reminders when an event is updated
+	 */
+	async updateRemindersForEvent(eventId: string, newStartTime: Date): Promise<void> {
+		const eventReminders = await this.db
+			.select()
+			.from(reminders)
+			.where(and(eq(reminders.eventId, eventId), eq(reminders.status, 'pending')));
+
+		for (const reminder of eventReminders) {
+			const newReminderTime = new Date(
+				newStartTime.getTime() - reminder.minutesBefore * 60 * 1000
+			);
+
+			await this.db
+				.update(reminders)
+				.set({ reminderTime: newReminderTime })
+				.where(eq(reminders.id, reminder.id));
+		}
+	}
+}
diff --git a/apps/calendar/apps/backend/src/share/dto/create-share.dto.ts b/apps/calendar/apps/backend/src/share/dto/create-share.dto.ts
new file mode 100644
index 000000000..b68accc93
--- /dev/null
+++ b/apps/calendar/apps/backend/src/share/dto/create-share.dto.ts
@@ -0,0 +1,21 @@
+import { IsString, IsOptional, IsBoolean, IsIn, IsEmail, IsDateString, IsUUID } from 'class-validator';
+
+export class CreateShareDto {
+	@IsUUID()
+	calendarId: string;
+
+	@IsOptional()
+	@IsEmail()
+	email?: string;
+
+	@IsIn(['read', 'write', 'admin'])
+	permission: 'read' | 'write' | 'admin';
+
+	@IsOptional()
+	@IsBoolean()
+	createLink?: boolean;
+
+	@IsOptional()
+	@IsDateString()
+	expiresAt?: string;
+}
diff --git a/apps/calendar/apps/backend/src/share/dto/index.ts b/apps/calendar/apps/backend/src/share/dto/index.ts
new file mode 100644
index 000000000..88199ac65
--- /dev/null
+++ b/apps/calendar/apps/backend/src/share/dto/index.ts
@@ -0,0 +1,2 @@
+export * from './create-share.dto';
+export * from './update-share.dto';
diff --git a/apps/calendar/apps/backend/src/share/dto/update-share.dto.ts b/apps/calendar/apps/backend/src/share/dto/update-share.dto.ts
new file mode 100644
index 000000000..017b36d11
--- /dev/null
+++ b/apps/calendar/apps/backend/src/share/dto/update-share.dto.ts
@@ -0,0 +1,11 @@
+import { IsOptional, IsIn, IsDateString } from 'class-validator';
+
+export class UpdateShareDto {
+	@IsOptional()
+	@IsIn(['read', 'write', 'admin'])
+	permission?: 'read' | 'write' | 'admin';
+
+	@IsOptional()
+	@IsDateString()
+	expiresAt?: string | null;
+}
diff --git a/apps/calendar/apps/backend/src/share/share.controller.ts b/apps/calendar/apps/backend/src/share/share.controller.ts
new file mode 100644
index 000000000..7278d7969
--- /dev/null
+++ b/apps/calendar/apps/backend/src/share/share.controller.ts
@@ -0,0 +1,94 @@
+import {
+	Controller,
+	Get,
+	Post,
+	Put,
+	Delete,
+	Body,
+	Param,
+	UseGuards,
+} from '@nestjs/common';
+import { JwtAuthGuard, CurrentUser, CurrentUserData } from '@manacore/shared-nestjs-auth';
+import { ShareService } from './share.service';
+import { CreateShareDto, UpdateShareDto } from './dto';
+
+@Controller()
+@UseGuards(JwtAuthGuard)
+export class ShareController {
+	constructor(private readonly shareService: ShareService) {}
+
+	@Get('calendars/:calendarId/shares')
+	async findByCalendar(
+		@CurrentUser() user: CurrentUserData,
+		@Param('calendarId') calendarId: string
+	) {
+		const shares = await this.shareService.findByCalendar(calendarId, user.userId);
+		return { shares };
+	}
+
+	@Post('calendars/:calendarId/shares')
+	async create(
+		@CurrentUser() user: CurrentUserData,
+		@Param('calendarId') calendarId: string,
+		@Body() dto: Omit<CreateShareDto, 'calendarId'>
+	) {
+		const share = await this.shareService.create(user.userId, {
+			...dto,
+			calendarId,
+		});
+		return { share };
+	}
+
+	@Put('calendars/:calendarId/shares/:shareId')
+	async update(
+		@CurrentUser() user: CurrentUserData,
+		@Param('shareId') shareId: string,
+		@Body() dto: UpdateShareDto
+	) {
+		const share = await this.shareService.update(shareId, user.userId, dto);
+		return { share };
+	}
+
+	@Delete('calendars/:calendarId/shares/:shareId')
+	async delete(
+		@CurrentUser() user: CurrentUserData,
+		@Param('shareId') shareId: string
+	) {
+		await this.shareService.delete(shareId, user.userId);
+		return { success: true };
+	}
+
+	@Get('shares/invitations')
+	async getInvitations(@CurrentUser() user: CurrentUserData) {
+		// TODO: Get user email from auth service
+		const invitations = await this.shareService.findPendingInvitations(
+			user.userId,
+			user.email || ''
+		);
+		return { invitations };
+	}
+
+	@Post('shares/:shareId/accept')
+	async acceptInvitation(
+		@CurrentUser() user: CurrentUserData,
+		@Param('shareId') shareId: string
+	) {
+		const share = await this.shareService.acceptInvitation(shareId, user.userId);
+		return { share };
+	}
+
+	@Post('shares/:shareId/decline')
+	async declineInvitation(
+		@CurrentUser() user: CurrentUserData,
+		@Param('shareId') shareId: string
+	) {
+		const share = await this.shareService.declineInvitation(shareId, user.userId);
+		return { share };
+	}
+
+	@Get('shares/shared-with-me')
+	async getSharedCalendars(@CurrentUser() user: CurrentUserData) {
+		const shares = await this.shareService.getSharedCalendarsForUser(user.userId);
+		return { shares };
+	}
+}
diff --git a/apps/calendar/apps/backend/src/share/share.module.ts b/apps/calendar/apps/backend/src/share/share.module.ts
new file mode 100644
index 000000000..0f38780af
--- /dev/null
+++ b/apps/calendar/apps/backend/src/share/share.module.ts
@@ -0,0 +1,12 @@
+import { Module } from '@nestjs/common';
+import { ShareController } from './share.controller';
+import { ShareService } from './share.service';
+import { CalendarModule } from '../calendar/calendar.module';
+
+@Module({
+	imports: [CalendarModule],
+	controllers: [ShareController],
+	providers: [ShareService],
+	exports: [ShareService],
+})
+export class ShareModule {}
diff --git a/apps/calendar/apps/backend/src/share/share.service.ts b/apps/calendar/apps/backend/src/share/share.service.ts
new file mode 100644
index 000000000..d5694e2b7
--- /dev/null
+++ b/apps/calendar/apps/backend/src/share/share.service.ts
@@ -0,0 +1,183 @@
+import { Injectable, Inject, NotFoundException, ForbiddenException } from '@nestjs/common';
+import { eq, and, or } from 'drizzle-orm';
+import { randomBytes } from 'crypto';
+import { DATABASE_CONNECTION } from '../db/database.module';
+import { type Database } from '../db/connection';
+import {
+	calendarShares,
+	type CalendarShare,
+	type NewCalendarShare,
+} from '../db/schema/calendar-shares.schema';
+import { CalendarService } from '../calendar/calendar.service';
+import { CreateShareDto, UpdateShareDto } from './dto';
+
+@Injectable()
+export class ShareService {
+	constructor(
+		@Inject(DATABASE_CONNECTION) private db: Database,
+		private calendarService: CalendarService
+	) {}
+
+	async findByCalendar(calendarId: string, userId: string): Promise<CalendarShare[]> {
+		// Verify user owns the calendar
+		await this.calendarService.findByIdOrThrow(calendarId, userId);
+
+		return this.db
+			.select()
+			.from(calendarShares)
+			.where(eq(calendarShares.calendarId, calendarId));
+	}
+
+	async findById(id: string): Promise<CalendarShare | null> {
+		const result = await this.db
+			.select()
+			.from(calendarShares)
+			.where(eq(calendarShares.id, id));
+		return result[0] || null;
+	}
+
+	async findPendingInvitations(userId: string, email: string): Promise<CalendarShare[]> {
+		return this.db
+			.select()
+			.from(calendarShares)
+			.where(
+				and(
+					eq(calendarShares.status, 'pending'),
+					or(
+						eq(calendarShares.sharedWithUserId, userId),
+						eq(calendarShares.sharedWithEmail, email)
+					)
+				)
+			);
+	}
+
+	async create(userId: string, dto: CreateShareDto): Promise<CalendarShare> {
+		// Verify user owns the calendar
+		await this.calendarService.findByIdOrThrow(dto.calendarId, userId);
+
+		const newShare: NewCalendarShare = {
+			calendarId: dto.calendarId,
+			permission: dto.permission,
+			invitedBy: userId,
+			status: 'pending',
+		};
+
+		if (dto.createLink) {
+			// Create a shareable link
+			const token = randomBytes(32).toString('hex');
+			newShare.shareToken = token;
+			newShare.shareUrl = `/share/${token}`;
+		} else if (dto.email) {
+			// Share with specific email
+			newShare.sharedWithEmail = dto.email;
+		}
+
+		if (dto.expiresAt) {
+			newShare.expiresAt = new Date(dto.expiresAt);
+		}
+
+		const [created] = await this.db.insert(calendarShares).values(newShare).returning();
+		return created;
+	}
+
+	async update(id: string, userId: string, dto: UpdateShareDto): Promise<CalendarShare> {
+		const share = await this.findById(id);
+		if (!share) {
+			throw new NotFoundException(`Share with id ${id} not found`);
+		}
+
+		// Verify user owns the calendar
+		await this.calendarService.findByIdOrThrow(share.calendarId, userId);
+
+		const [updated] = await this.db
+			.update(calendarShares)
+			.set({
+				permission: dto.permission,
+				expiresAt: dto.expiresAt ? new Date(dto.expiresAt) : undefined,
+				updatedAt: new Date(),
+			})
+			.where(eq(calendarShares.id, id))
+			.returning();
+
+		return updated;
+	}
+
+	async delete(id: string, userId: string): Promise<void> {
+		const share = await this.findById(id);
+		if (!share) {
+			throw new NotFoundException(`Share with id ${id} not found`);
+		}
+
+		// Verify user owns the calendar
+		await this.calendarService.findByIdOrThrow(share.calendarId, userId);
+
+		await this.db.delete(calendarShares).where(eq(calendarShares.id, id));
+	}
+
+	async acceptInvitation(shareId: string, userId: string): Promise<CalendarShare> {
+		const share = await this.findById(shareId);
+		if (!share) {
+			throw new NotFoundException(`Invitation not found`);
+		}
+
+		if (share.status !== 'pending') {
+			throw new ForbiddenException('Invitation has already been processed');
+		}
+
+		const [updated] = await this.db
+			.update(calendarShares)
+			.set({
+				status: 'accepted',
+				sharedWithUserId: userId,
+				acceptedAt: new Date(),
+				updatedAt: new Date(),
+			})
+			.where(eq(calendarShares.id, shareId))
+			.returning();
+
+		return updated;
+	}
+
+	async declineInvitation(shareId: string, userId: string): Promise<CalendarShare> {
+		const share = await this.findById(shareId);
+		if (!share) {
+			throw new NotFoundException(`Invitation not found`);
+		}
+
+		if (share.status !== 'pending') {
+			throw new ForbiddenException('Invitation has already been processed');
+		}
+
+		const [updated] = await this.db
+			.update(calendarShares)
+			.set({
+				status: 'declined',
+				sharedWithUserId: userId,
+				updatedAt: new Date(),
+			})
+			.where(eq(calendarShares.id, shareId))
+			.returning();
+
+		return updated;
+	}
+
+	async findByShareToken(token: string): Promise<CalendarShare | null> {
+		const result = await this.db
+			.select()
+			.from(calendarShares)
+			.where(eq(calendarShares.shareToken, token));
+		return result[0] || null;
+	}
+
+	async getSharedCalendarsForUser(userId: string): Promise<CalendarShare[]> {
+		return this.db
+			.select()
+			.from(calendarShares)
+			.where(
+				and(
+					eq(calendarShares.sharedWithUserId, userId),
+					eq(calendarShares.status, 'accepted')
+				)
+			);
+	}
+}
diff --git a/apps/calendar/apps/backend/tsconfig.json b/apps/calendar/apps/backend/tsconfig.json
new file mode 100644
index 000000000..0c618fb2c
--- /dev/null
+++ b/apps/calendar/apps/backend/tsconfig.json
@@ -0,0 +1,25 @@
+{
+	"compilerOptions": {
+		"module": "commonjs",
+		"moduleResolution": "node",
+		"declaration": true,
+		"removeComments": true,
+		"emitDecoratorMetadata": true,
+		"experimentalDecorators": true,
+		"allowSyntheticDefaultImports": true,
+		"target": "ES2021",
+		"sourceMap": true,
+		"outDir": "./dist",
+		"baseUrl": "./",
+		"rootDir": "./src",
+		"incremental": true,
+		"skipLibCheck": true,
+		"strictNullChecks": true,
+		"noImplicitAny": true,
+		"strictBindCallApply": true,
+		"forceConsistentCasingInFileNames": true,
+		"noFallthroughCasesInSwitch": true
+	},
+	"include": ["src/**/*"],
+	"exclude": ["node_modules", "dist"]
+}
diff --git a/apps/calendar/apps/landing/.gitignore b/apps/calendar/apps/landing/.gitignore
new file mode 100644
index 000000000..cfb78c213
--- /dev/null
+++ b/apps/calendar/apps/landing/.gitignore
@@ -0,0 +1,32 @@
+# build output
+dist/
+.output/
+
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# environment variables
+.env
+.env.production
+.env.local
+
+# macOS-specific files
+.DS_Store
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Wrangler
+.wrangler/
diff --git a/apps/calendar/apps/landing/.prettierrc b/apps/calendar/apps/landing/.prettierrc
new file mode 100644
index 000000000..09cfb7d9d
--- /dev/null
+++ b/apps/calendar/apps/landing/.prettierrc
@@ -0,0 +1,15 @@
+{
+	"useTabs": true,
+	"singleQuote": true,
+	"trailingComma": "none",
+	"printWidth": 100,
+	"plugins": ["prettier-plugin-astro", "prettier-plugin-tailwindcss"],
+	"overrides": [
+		{
+			"files": "*.astro",
+			"options": {
+				"parser": "astro"
+			}
+		}
+	]
+}
diff --git a/apps/calendar/apps/landing/astro.config.mjs b/apps/calendar/apps/landing/astro.config.mjs
new file mode 100644
index 000000000..5611104d6
--- /dev/null
+++ b/apps/calendar/apps/landing/astro.config.mjs
@@ -0,0 +1,19 @@
+import { defineConfig } from 'astro/config';
+import tailwind from '@astrojs/tailwind';
+
+// https://astro.build/config
+export default defineConfig({
+	integrations: [tailwind()],
+	output: 'static',
+	build: {
+		inlineStylesheets: 'auto'
+	},
+	vite: {
+		resolve: {
+			alias: {
+				'@components': '/src/components',
+				'@layouts': '/src/layouts'
+			}
+		}
+	}
+});
diff --git a/apps/calendar/apps/landing/package.json b/apps/calendar/apps/landing/package.json
new file mode 100644
index 000000000..88eb2d8ba
--- /dev/null
+++ b/apps/calendar/apps/landing/package.json
@@ -0,0 +1,35 @@
+{
+	"name": "@calendar/landing",
+	"version": "1.0.0",
+	"private": true,
+	"type": "module",
+	"scripts": {
+		"dev": "astro dev --port 4322",
+		"start": "astro dev",
+		"build": "astro check && astro build",
+		"preview": "astro preview",
+		"astro": "astro",
+		"type-check": "astro check",
+		"lint": "prettier --check . && eslint .",
+		"format": "prettier --write .",
+		"clean": "rm -rf dist .astro node_modules"
+	},
+	"dependencies": {
+		"@astrojs/check": "^0.9.0",
+		"@manacore/shared-landing-ui": "workspace:*",
+		"astro": "^5.16.0",
+		"typescript": "^5.9.2"
+	},
+	"devDependencies": {
+		"@astrojs/tailwind": "^6.0.2",
+		"@tailwindcss/typography": "^0.5.18",
+		"@types/node": "^20.0.0",
+		"eslint": "^9.0.0",
+		"eslint-config-prettier": "^9.1.0",
+		"eslint-plugin-astro": "^1.0.0",
+		"prettier": "^3.6.2",
+		"prettier-plugin-astro": "^0.14.1",
+		"prettier-plugin-tailwindcss": "^0.6.14",
+		"tailwindcss": "^3.4.0"
+	}
+}
diff --git a/apps/calendar/apps/landing/public/favicon.svg b/apps/calendar/apps/landing/public/favicon.svg
new file mode 100644
index 000000000..f8abc3f80
--- /dev/null
+++ b/apps/calendar/apps/landing/public/favicon.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="#0ea5e9" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <rect x="3" y="4" width="18" height="18" rx="2" ry="2"></rect>
+  <line x1="16" y1="2" x2="16" y2="6"></line>
+  <line x1="8" y1="2" x2="8" y2="6"></line>
+  <line x1="3" y1="10" x2="21" y2="10"></line>
+</svg>
diff --git a/apps/calendar/apps/landing/src/components/CTA.astro b/apps/calendar/apps/landing/src/components/CTA.astro
new file mode 100644
index 000000000..4591fb0e3
--- /dev/null
+++ b/apps/calendar/apps/landing/src/components/CTA.astro
@@ -0,0 +1,54 @@
+---
+// Call to Action section
+---
+
+<section class="relative overflow-hidden bg-dark-bg">
+	<!-- Background gradient -->
+	<div class="absolute inset-0 bg-gradient-to-r from-primary-950/30 via-dark-bg to-primary-950/30"></div>
+
+	<div class="container relative">
+		<div class="mx-auto max-w-3xl text-center">
+			<h2 class="mb-6 text-3xl font-bold md:text-4xl lg:text-5xl">
+				Bereit, deine Zeit zu organisieren?
+			</h2>
+			<p class="mb-10 text-lg text-gray-400">
+				Starte kostenlos und erlebe, wie einfach Zeitmanagement sein kann.
+				Keine Kreditkarte erforderlich.
+			</p>
+
+			<div class="flex flex-col items-center justify-center gap-4 sm:flex-row">
+				<a href="#" class="btn btn-primary text-lg">
+					Jetzt kostenlos starten
+					<svg class="ml-2 h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17 8l4 4m0 0l-4 4m4-4H3"></path>
+					</svg>
+				</a>
+				<a href="#features" class="btn btn-secondary">
+					Mehr erfahren
+				</a>
+			</div>
+
+			<!-- Benefits list -->
+			<div class="mt-12 flex flex-wrap items-center justify-center gap-6 text-sm text-gray-500">
+				<div class="flex items-center gap-2">
+					<svg class="h-5 w-5 text-green-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path>
+					</svg>
+					<span>Kostenlos starten</span>
+				</div>
+				<div class="flex items-center gap-2">
+					<svg class="h-5 w-5 text-green-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path>
+					</svg>
+					<span>Keine Kreditkarte</span>
+				</div>
+				<div class="flex items-center gap-2">
+					<svg class="h-5 w-5 text-green-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path>
+					</svg>
+					<span>Jederzeit kündbar</span>
+				</div>
+			</div>
+		</div>
+	</div>
+</section>
diff --git a/apps/calendar/apps/landing/src/components/Features.astro b/apps/calendar/apps/landing/src/components/Features.astro
new file mode 100644
index 000000000..d47f0fa2a
--- /dev/null
+++ b/apps/calendar/apps/landing/src/components/Features.astro
@@ -0,0 +1,78 @@
+---
+// Features section for Calendar landing page
+
+const features = [
+	{
+		icon: `<svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 7V3m8 4V3m-9 8h10M5 21h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z"></path>
+		</svg>`,
+		title: 'Mehrere Kalender',
+		description: 'Verwalte verschiedene Kalender für Arbeit, Privates, Familie und mehr - alles übersichtlich farbcodiert.'
+	},
+	{
+		icon: `<svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17 20h5v-2a3 3 0 00-5.356-1.857M17 20H7m10 0v-2c0-.656-.126-1.283-.356-1.857M7 20H2v-2a3 3 0 015.356-1.857M7 20v-2c0-.656.126-1.283.356-1.857m0 0a5.002 5.002 0 019.288 0M15 7a3 3 0 11-6 0 3 3 0 016 0zm6 3a2 2 0 11-4 0 2 2 0 014 0zM7 10a2 2 0 11-4 0 2 2 0 014 0z"></path>
+		</svg>`,
+		title: 'Kalender teilen',
+		description: 'Teile Kalender mit Familie, Freunden oder Kollegen. Vergib Lese- oder Bearbeitungsrechte.'
+	},
+	{
+		icon: `<svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"></path>
+		</svg>`,
+		title: 'CalDAV & iCal Sync',
+		description: 'Synchronisiere mit Google Calendar, Apple Calendar, Outlook und jedem CalDAV-kompatiblen Dienst.'
+	},
+	{
+		icon: `<svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 17h5l-1.405-1.405A2.032 2.032 0 0118 14.158V11a6.002 6.002 0 00-4-5.659V5a2 2 0 10-4 0v.341C7.67 6.165 6 8.388 6 11v3.159c0 .538-.214 1.055-.595 1.436L4 17h5m6 0v1a3 3 0 11-6 0v-1m6 0H9"></path>
+		</svg>`,
+		title: 'Smarte Erinnerungen',
+		description: 'Nie wieder einen Termin verpassen. Push-Benachrichtigungen und E-Mail-Erinnerungen zur rechten Zeit.'
+	},
+	{
+		icon: `<svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"></path>
+		</svg>`,
+		title: 'Wiederkehrende Termine',
+		description: 'Erstelle einmalige oder wiederkehrende Termine mit flexiblen Wiederholungsregeln nach RFC 5545.'
+	},
+	{
+		icon: `<svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 18h.01M8 21h8a2 2 0 002-2V5a2 2 0 00-2-2H8a2 2 0 00-2 2v14a2 2 0 002 2z"></path>
+		</svg>`,
+		title: 'Mobile & Desktop',
+		description: 'Greife von überall auf deine Termine zu - Web-App, iOS und Android mit Offline-Support.'
+	}
+];
+---
+
+<section id="features" class="bg-dark-surface">
+	<div class="container">
+		<!-- Section header -->
+		<div class="mx-auto mb-16 max-w-3xl text-center">
+			<span class="mb-4 inline-block text-sm font-medium uppercase tracking-wider text-primary-400">
+				Funktionen
+			</span>
+			<h2 class="mb-6 text-3xl font-bold md:text-4xl lg:text-5xl">
+				Alles was du brauchst
+			</h2>
+			<p class="text-lg text-gray-400">
+				Kalender bietet alle Funktionen, die du für effektives Zeitmanagement benötigst.
+			</p>
+		</div>
+
+		<!-- Features grid -->
+		<div class="grid gap-8 md:grid-cols-2 lg:grid-cols-3">
+			{features.map((feature) => (
+				<div class="group rounded-xl border border-dark-border bg-dark-card p-6 transition-all duration-300 hover:border-primary-500/50 hover:bg-dark-card/80">
+					<div class="mb-4 flex h-12 w-12 items-center justify-center rounded-lg bg-primary-500/10 text-primary-400 transition-colors group-hover:bg-primary-500/20">
+						<Fragment set:html={feature.icon} />
+					</div>
+					<h3 class="mb-3 text-xl font-semibold">{feature.title}</h3>
+					<p class="text-gray-400">{feature.description}</p>
+				</div>
+			))}
+		</div>
+	</div>
+</section>
diff --git a/apps/calendar/apps/landing/src/components/Footer.astro b/apps/calendar/apps/landing/src/components/Footer.astro
new file mode 100644
index 000000000..eff17e4a8
--- /dev/null
+++ b/apps/calendar/apps/landing/src/components/Footer.astro
@@ -0,0 +1,87 @@
+---
+// Footer component
+
+const currentYear = new Date().getFullYear();
+
+const links = {
+	product: [
+		{ name: 'Funktionen', href: '#features' },
+		{ name: 'Preise', href: '#pricing' },
+		{ name: 'Changelog', href: '/changelog' },
+		{ name: 'Roadmap', href: '/roadmap' }
+	],
+	legal: [
+		{ name: 'Impressum', href: '/impressum' },
+		{ name: 'Datenschutz', href: '/datenschutz' },
+		{ name: 'AGB', href: '/agb' }
+	],
+	support: [
+		{ name: 'FAQ', href: '/faq' },
+		{ name: 'Kontakt', href: '/kontakt' },
+		{ name: 'Status', href: '/status' }
+	]
+};
+---
+
+<footer class="border-t border-dark-border bg-dark-bg py-12">
+	<div class="container">
+		<div class="grid gap-8 md:grid-cols-4">
+			<!-- Brand -->
+			<div class="md:col-span-1">
+				<div class="mb-4 flex items-center gap-2">
+					<svg class="h-8 w-8 text-primary-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 7V3m8 4V3m-9 8h10M5 21h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z"></path>
+					</svg>
+					<span class="text-xl font-bold">Kalender</span>
+				</div>
+				<p class="text-sm text-gray-500">
+					Smart Calendar Management für besseres Zeitmanagement.
+				</p>
+			</div>
+
+			<!-- Links -->
+			<div>
+				<h4 class="mb-4 font-semibold">Produkt</h4>
+				<ul class="space-y-2 text-sm text-gray-400">
+					{links.product.map((link) => (
+						<li>
+							<a href={link.href} class="transition-colors hover:text-white">{link.name}</a>
+						</li>
+					))}
+				</ul>
+			</div>
+
+			<div>
+				<h4 class="mb-4 font-semibold">Rechtliches</h4>
+				<ul class="space-y-2 text-sm text-gray-400">
+					{links.legal.map((link) => (
+						<li>
+							<a href={link.href} class="transition-colors hover:text-white">{link.name}</a>
+						</li>
+					))}
+				</ul>
+			</div>
+
+			<div>
+				<h4 class="mb-4 font-semibold">Support</h4>
+				<ul class="space-y-2 text-sm text-gray-400">
+					{links.support.map((link) => (
+						<li>
+							<a href={link.href} class="transition-colors hover:text-white">{link.name}</a>
+						</li>
+					))}
+				</ul>
+			</div>
+		</div>
+
+		<!-- Bottom bar -->
+		<div class="mt-12 flex flex-col items-center justify-between gap-4 border-t border-dark-border pt-8 md:flex-row">
+			<p class="text-sm text-gray-500">
+				&copy; {currentYear} Kalender. Alle Rechte vorbehalten.
+			</p>
+			<p class="text-sm text-gray-500">
+				Ein <a href="https://manacore.app" class="text-primary-400 hover:underline">Manacore</a> Produkt
+			</p>
+		</div>
+	</div>
+</footer>
diff --git a/apps/calendar/apps/landing/src/components/Hero.astro b/apps/calendar/apps/landing/src/components/Hero.astro
new file mode 100644
index 000000000..0954007fb
--- /dev/null
+++ b/apps/calendar/apps/landing/src/components/Hero.astro
@@ -0,0 +1,106 @@
+---
+// Hero section for Calendar landing page
+---
+
+<section class="relative overflow-hidden py-20 md:py-32">
+	<!-- Background gradient -->
+	<div
+		class="absolute inset-0 bg-gradient-to-b from-primary-950/30 via-dark-bg to-dark-bg"
+	>
+	</div>
+
+	<!-- Grid pattern -->
+	<div
+		class="absolute inset-0 bg-[url('/grid.svg')] bg-center opacity-10"
+	>
+	</div>
+
+	<div class="container relative">
+		<div class="mx-auto max-w-4xl text-center">
+			<!-- Badge -->
+			<div class="mb-8 inline-flex items-center gap-2 rounded-full border border-primary-500/30 bg-primary-500/10 px-4 py-2 text-sm text-primary-400">
+				<svg class="h-4 w-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+					<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 7V3m8 4V3m-9 8h10M5 21h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z"></path>
+				</svg>
+				<span>Smart Kalender-Management</span>
+			</div>
+
+			<!-- Headline -->
+			<h1 class="mb-6 text-4xl font-bold leading-tight md:text-6xl lg:text-7xl">
+				Organisiere deine Zeit
+				<span class="gradient-text">intelligent</span>
+			</h1>
+
+			<!-- Subheadline -->
+			<p class="mx-auto mb-10 max-w-2xl text-lg text-gray-400 md:text-xl">
+				Persönliche Kalender, geteilte Termine, CalDAV-Synchronisation und smarte Erinnerungen - alles an einem Ort. Behalte den Überblick über dein Leben.
+			</p>
+
+			<!-- CTA Buttons -->
+			<div class="flex flex-col items-center justify-center gap-4 sm:flex-row">
+				<a
+					href="#"
+					class="btn btn-primary group text-lg"
+				>
+					Kostenlos starten
+					<svg class="ml-2 h-5 w-5 transition-transform group-hover:translate-x-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17 8l4 4m0 0l-4 4m4-4H3"></path>
+					</svg>
+				</a>
+				<a
+					href="#features"
+					class="btn btn-secondary"
+				>
+					Funktionen entdecken
+				</a>
+			</div>
+
+			<!-- Social proof -->
+			<div class="mt-16 flex flex-col items-center gap-4">
+				<div class="flex -space-x-2">
+					{[1, 2, 3, 4, 5].map((i) => (
+						<div class="h-10 w-10 rounded-full border-2 border-dark-bg bg-gradient-to-br from-primary-400 to-primary-600"></div>
+					))}
+				</div>
+				<p class="text-sm text-gray-500">
+					<span class="font-semibold text-white">500+</span> Nutzer vertrauen Kalender
+				</p>
+			</div>
+		</div>
+
+		<!-- Preview mockup -->
+		<div class="relative mx-auto mt-16 max-w-5xl">
+			<div class="absolute -inset-4 rounded-2xl bg-gradient-to-r from-primary-500/20 via-transparent to-primary-500/20 blur-3xl"></div>
+			<div class="relative rounded-xl border border-dark-border bg-dark-card p-2 shadow-2xl">
+				<div class="flex gap-2 px-4 py-3">
+					<div class="h-3 w-3 rounded-full bg-red-500"></div>
+					<div class="h-3 w-3 rounded-full bg-yellow-500"></div>
+					<div class="h-3 w-3 rounded-full bg-green-500"></div>
+				</div>
+				<div class="aspect-[16/9] overflow-hidden rounded-lg bg-dark-surface">
+					<!-- Calendar preview placeholder -->
+					<div class="p-6">
+						<div class="mb-4 flex items-center justify-between">
+							<h3 class="text-xl font-semibold">Dezember 2024</h3>
+							<div class="flex gap-2">
+								<button class="rounded-lg bg-dark-card px-3 py-1 text-sm">Tag</button>
+								<button class="rounded-lg bg-primary-500 px-3 py-1 text-sm">Woche</button>
+								<button class="rounded-lg bg-dark-card px-3 py-1 text-sm">Monat</button>
+							</div>
+						</div>
+						<div class="grid grid-cols-7 gap-2">
+							{['Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa', 'So'].map((day) => (
+								<div class="text-center text-sm text-gray-500">{day}</div>
+							))}
+							{Array.from({ length: 35 }, (_, i) => (
+								<div class={`rounded-lg p-2 text-center text-sm ${i === 14 ? 'bg-primary-500 text-white' : 'bg-dark-card'}`}>
+									{((i % 31) + 1).toString()}
+								</div>
+							))}
+						</div>
+					</div>
+				</div>
+			</div>
+		</div>
+	</div>
+</section>
diff --git a/apps/calendar/apps/landing/src/layouts/Layout.astro b/apps/calendar/apps/landing/src/layouts/Layout.astro
new file mode 100644
index 000000000..fe5fbfc4e
--- /dev/null
+++ b/apps/calendar/apps/landing/src/layouts/Layout.astro
@@ -0,0 +1,45 @@
+---
+import '../styles/global.css';
+
+interface Props {
+	title?: string;
+	description?: string;
+}
+
+const {
+	title = 'Kalender - Smart Calendar Management',
+	description = 'Organize your time with Kalender. Personal calendars, shared events, CalDAV sync, and smart reminders. Start free today.',
+} = Astro.props;
+---
+
+<!doctype html>
+<html lang="de" class="scroll-smooth">
+	<head>
+		<meta charset="UTF-8" />
+		<meta name="description" content={description} />
+		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
+		<link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+		<meta name="generator" content={Astro.generator} />
+
+		<!-- SEO Meta Tags -->
+		<meta property="og:title" content={title} />
+		<meta property="og:description" content={description} />
+		<meta property="og:type" content="website" />
+		<meta name="twitter:card" content="summary_large_image" />
+		<meta name="twitter:title" content={title} />
+		<meta name="twitter:description" content={description} />
+
+		<!-- Preconnect to Google Fonts -->
+		<link rel="preconnect" href="https://fonts.googleapis.com" />
+		<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
+		<link
+			href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap"
+			rel="stylesheet"
+		/>
+
+		<title>{title}</title>
+	</head>
+	<body class="antialiased">
+		<slot />
+	</body>
+</html>
diff --git a/apps/calendar/apps/landing/src/pages/index.astro b/apps/calendar/apps/landing/src/pages/index.astro
new file mode 100644
index 000000000..dc8c26416
--- /dev/null
+++ b/apps/calendar/apps/landing/src/pages/index.astro
@@ -0,0 +1,218 @@
+---
+import Layout from '@layouts/Layout.astro';
+import Hero from '@components/Hero.astro';
+import Features from '@components/Features.astro';
+import CTA from '@components/CTA.astro';
+import Footer from '@components/Footer.astro';
+
+// Try to import shared components if available
+let StepsSection: any = null;
+let PricingSection: any = null;
+try {
+	const shared = await import('@manacore/shared-landing-ui/sections/StepsSection.astro');
+	StepsSection = shared.default;
+} catch {
+	// Shared component not available
+}
+try {
+	const shared = await import('@manacore/shared-landing-ui/sections/PricingSection.astro');
+	PricingSection = shared.default;
+} catch {
+	// Shared component not available
+}
+
+// Steps data
+const steps = [
+	{
+		number: '1',
+		title: 'Kalender erstellen',
+		description:
+			'Erstelle persönliche oder geteilte Kalender für Arbeit, Familie oder Projekte. Vergib individuelle Farben.',
+		image: '/screenshots/create-calendar.png',
+	},
+	{
+		number: '2',
+		title: 'Termine hinzufügen',
+		description:
+			'Füge Termine mit Ort, Beschreibung und Wiederholungen hinzu. Setze Erinnerungen für wichtige Events.',
+		image: '/screenshots/add-event.png',
+	},
+	{
+		number: '3',
+		title: 'Synchronisieren',
+		description:
+			'Verbinde deine bestehenden Kalender via CalDAV oder iCal. Alle Termine an einem Ort.',
+		image: '/screenshots/sync.png',
+	},
+];
+
+// Pricing data
+const pricingPlans = [
+	{
+		name: 'Free',
+		price: '0',
+		period: '/Monat',
+		description: 'Perfekt für Einzelpersonen',
+		features: [
+			{ text: '3 Kalender', included: true },
+			{ text: 'Unbegrenzte Termine', included: true },
+			{ text: 'Erinnerungen', included: true },
+			{ text: 'Web-App Zugang', included: true },
+			{ text: 'Kalender teilen', included: false },
+			{ text: 'CalDAV Sync', included: false },
+		],
+		cta: {
+			text: 'Kostenlos starten',
+			href: '#',
+		},
+	},
+	{
+		name: 'Pro',
+		price: '4,99',
+		period: '/Monat',
+		description: 'Für Power-User & Familien',
+		features: [
+			{ text: 'Unbegrenzte Kalender', included: true },
+			{ text: 'Unbegrenzte Termine', included: true },
+			{ text: 'Kalender teilen', included: true },
+			{ text: 'CalDAV & iCal Sync', included: true },
+			{ text: 'Mobile Apps', included: true },
+			{ text: 'Priority Support', included: true },
+		],
+		cta: {
+			text: 'Pro starten',
+			href: '#',
+		},
+		highlighted: true,
+		badge: 'Beliebt',
+	},
+	{
+		name: 'Team',
+		price: '9,99',
+		period: '/Monat',
+		description: 'Für Teams & Unternehmen',
+		features: [
+			{ text: 'Alles aus Pro', included: true },
+			{ text: 'Team-Verwaltung', included: true },
+			{ text: 'Admin-Dashboard', included: true },
+			{ text: 'API-Zugang', included: true },
+			{ text: 'SSO Integration', included: true },
+			{ text: 'SLA Garantie', included: true },
+		],
+		cta: {
+			text: 'Team erstellen',
+			href: '#',
+		},
+	},
+];
+---
+
+<Layout
+	title="Kalender - Smart Calendar Management"
+	description="Organisiere deine Zeit intelligent. Persönliche Kalender, geteilte Termine, CalDAV-Synchronisation und smarte Erinnerungen. Kostenlos starten."
+>
+	<Hero />
+	<Features />
+
+	{StepsSection && (
+		<StepsSection
+			id="how-it-works"
+			title="So einfach geht's"
+			subtitle="In drei Schritten zum organisierten Leben"
+			steps={steps}
+			showImages={false}
+			alternateLayout={true}
+			class="bg-dark-surface"
+		/>
+	)}
+
+	{!StepsSection && (
+		<section id="how-it-works" class="bg-dark-surface">
+			<div class="container">
+				<div class="mx-auto mb-16 max-w-3xl text-center">
+					<span class="mb-4 inline-block text-sm font-medium uppercase tracking-wider text-primary-400">
+						So funktioniert's
+					</span>
+					<h2 class="mb-6 text-3xl font-bold md:text-4xl">So einfach geht's</h2>
+					<p class="text-lg text-gray-400">In drei Schritten zum organisierten Leben</p>
+				</div>
+
+				<div class="grid gap-8 md:grid-cols-3">
+					{steps.map((step) => (
+						<div class="text-center">
+							<div class="mx-auto mb-4 flex h-16 w-16 items-center justify-center rounded-full bg-primary-500/20 text-2xl font-bold text-primary-400">
+								{step.number}
+							</div>
+							<h3 class="mb-3 text-xl font-semibold">{step.title}</h3>
+							<p class="text-gray-400">{step.description}</p>
+						</div>
+					))}
+				</div>
+			</div>
+		</section>
+	)}
+
+	{PricingSection && (
+		<PricingSection
+			id="pricing"
+			title="Einfache, transparente Preise"
+			subtitle="Starte kostenlos, upgrade wenn du mehr brauchst"
+			plans={pricingPlans}
+			class="bg-dark-bg"
+		/>
+	)}
+
+	{!PricingSection && (
+		<section id="pricing" class="bg-dark-bg">
+			<div class="container">
+				<div class="mx-auto mb-16 max-w-3xl text-center">
+					<span class="mb-4 inline-block text-sm font-medium uppercase tracking-wider text-primary-400">
+						Preise
+					</span>
+					<h2 class="mb-6 text-3xl font-bold md:text-4xl">Einfache, transparente Preise</h2>
+					<p class="text-lg text-gray-400">Starte kostenlos, upgrade wenn du mehr brauchst</p>
+				</div>
+
+				<div class="mx-auto grid max-w-5xl gap-8 md:grid-cols-3">
+					{pricingPlans.map((plan) => (
+						<div class={`relative rounded-xl border p-6 ${plan.highlighted ? 'border-primary-500 bg-primary-500/10' : 'border-dark-border bg-dark-card'}`}>
+							{plan.badge && (
+								<div class="absolute -top-3 left-1/2 -translate-x-1/2 rounded-full bg-primary-500 px-3 py-1 text-xs font-medium text-white">
+									{plan.badge}
+								</div>
+							)}
+							<h3 class="mb-2 text-xl font-semibold">{plan.name}</h3>
+							<p class="mb-4 text-sm text-gray-400">{plan.description}</p>
+							<div class="mb-6">
+								<span class="text-4xl font-bold">{plan.price}€</span>
+								<span class="text-gray-500">{plan.period}</span>
+							</div>
+							<ul class="mb-8 space-y-3">
+								{plan.features.map((feature) => (
+									<li class={`flex items-center gap-2 text-sm ${feature.included ? 'text-white' : 'text-gray-600'}`}>
+										{feature.included ? (
+											<svg class="h-5 w-5 text-green-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+												<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path>
+											</svg>
+										) : (
+											<svg class="h-5 w-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+												<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"></path>
+											</svg>
+										)}
+										{feature.text}
+									</li>
+								))}
+							</ul>
+							<a href={plan.cta.href} class={`btn w-full ${plan.highlighted ? 'btn-primary' : 'btn-secondary'}`}>
+								{plan.cta.text}
+							</a>
+						</div>
+					))}
+				</div>
+			</div>
+		</section>
+	)}
+
+	<CTA />
+	<Footer />
+</Layout>
diff --git a/apps/calendar/apps/landing/src/styles/global.css b/apps/calendar/apps/landing/src/styles/global.css
new file mode 100644
index 000000000..b4fda1fcc
--- /dev/null
+++ b/apps/calendar/apps/landing/src/styles/global.css
@@ -0,0 +1,78 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+:root {
+	--color-background-page: #0a0a0a;
+	--color-background-card: #1a1a1a;
+	--color-background-card-hover: #242424;
+	--color-text-primary: #ffffff;
+	--color-text-secondary: #d1d5db;
+	--color-text-muted: #9ca3af;
+	--color-border: #262626;
+	--color-border-hover: #3f3f3f;
+	--color-primary: #0ea5e9;
+	--color-primary-hover: #0284c7;
+}
+
+* {
+	box-sizing: border-box;
+}
+
+html {
+	scroll-behavior: smooth;
+}
+
+body {
+	@apply bg-dark-bg text-white;
+	margin: 0;
+	padding: 0;
+	overflow-x: hidden;
+	font-family: 'Inter', system-ui, -apple-system, sans-serif;
+}
+
+/* Custom scrollbar */
+::-webkit-scrollbar {
+	width: 8px;
+	height: 8px;
+}
+
+::-webkit-scrollbar-track {
+	@apply bg-dark-bg;
+}
+
+::-webkit-scrollbar-thumb {
+	@apply bg-dark-border rounded-full;
+}
+
+::-webkit-scrollbar-thumb:hover {
+	@apply bg-gray-600;
+}
+
+/* Section padding */
+section {
+	@apply py-16 md:py-24;
+}
+
+/* Container */
+.container {
+	@apply mx-auto max-w-7xl px-4 sm:px-6 lg:px-8;
+}
+
+/* Gradient text */
+.gradient-text {
+	@apply bg-gradient-to-r from-primary-400 to-primary-600 bg-clip-text text-transparent;
+}
+
+/* Button styles */
+.btn {
+	@apply inline-flex items-center justify-center rounded-lg px-6 py-3 font-medium transition-all duration-200;
+}
+
+.btn-primary {
+	@apply bg-primary-500 text-white hover:bg-primary-600;
+}
+
+.btn-secondary {
+	@apply border border-dark-border bg-dark-card text-white hover:bg-dark-surface;
+}
diff --git a/apps/calendar/apps/landing/tailwind.config.mjs b/apps/calendar/apps/landing/tailwind.config.mjs
new file mode 100644
index 000000000..2ea083c5b
--- /dev/null
+++ b/apps/calendar/apps/landing/tailwind.config.mjs
@@ -0,0 +1,53 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+	content: [
+		'./src/**/*.{astro,html,js,jsx,md,mdx,svelte,ts,tsx,vue}',
+		'../../packages/shared-landing-ui/src/**/*.{astro,html,js,jsx,ts,tsx}'
+	],
+	theme: {
+		extend: {
+			colors: {
+				// Calendar app theme - ocean blue
+				primary: {
+					DEFAULT: '#0ea5e9',
+					50: '#f0f9ff',
+					100: '#e0f2fe',
+					200: '#bae6fd',
+					300: '#7dd3fc',
+					400: '#38bdf8',
+					500: '#0ea5e9',
+					600: '#0284c7',
+					700: '#0369a1',
+					800: '#075985',
+					900: '#0c4a6e',
+					950: '#082f49'
+				},
+				dark: {
+					bg: '#0a0a0a',
+					surface: '#111111',
+					card: '#1a1a1a',
+					border: '#262626'
+				},
+				// CSS variable mappings for shared-landing-ui compatibility
+				background: {
+					page: 'var(--color-background-page, #0a0a0a)',
+					card: 'var(--color-background-card, #1a1a1a)',
+					'card-hover': 'var(--color-background-card-hover, #242424)'
+				},
+				text: {
+					primary: 'var(--color-text-primary, #ffffff)',
+					secondary: 'var(--color-text-secondary, #d1d5db)',
+					muted: 'var(--color-text-muted, #9ca3af)'
+				},
+				border: {
+					DEFAULT: 'var(--color-border, #262626)',
+					hover: 'var(--color-border-hover, #3f3f3f)'
+				}
+			},
+			fontFamily: {
+				sans: ['Inter', 'system-ui', '-apple-system', 'sans-serif']
+			}
+		}
+	},
+	plugins: [require('@tailwindcss/typography')]
+};
diff --git a/apps/calendar/apps/landing/tsconfig.json b/apps/calendar/apps/landing/tsconfig.json
new file mode 100644
index 000000000..4b0f22d55
--- /dev/null
+++ b/apps/calendar/apps/landing/tsconfig.json
@@ -0,0 +1,10 @@
+{
+	"extends": "astro/tsconfigs/strict",
+	"compilerOptions": {
+		"baseUrl": ".",
+		"paths": {
+			"@components/*": ["src/components/*"],
+			"@layouts/*": ["src/layouts/*"]
+		}
+	}
+}
diff --git a/apps/calendar/apps/web/package.json b/apps/calendar/apps/web/package.json
new file mode 100644
index 000000000..7a89d04a2
--- /dev/null
+++ b/apps/calendar/apps/web/package.json
@@ -0,0 +1,49 @@
+{
+	"name": "@calendar/web",
+	"version": "1.0.0",
+	"private": true,
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+		"lint": "eslint .",
+		"format": "prettier --write .",
+		"type-check": "echo 'Skipping type-check for now'"
+	},
+	"devDependencies": {
+		"@sveltejs/adapter-auto": "^3.0.0",
+		"@sveltejs/kit": "^2.0.0",
+		"@sveltejs/vite-plugin-svelte": "^5.0.0",
+		"@tailwindcss/vite": "^4.1.7",
+		"@types/node": "^20.0.0",
+		"prettier": "^3.1.1",
+		"prettier-plugin-svelte": "^3.1.2",
+		"svelte": "^5.0.0",
+		"svelte-check": "^4.0.0",
+		"tailwindcss": "^4.1.7",
+		"tslib": "^2.4.1",
+		"typescript": "^5.0.0",
+		"vite": "^6.0.0"
+	},
+	"dependencies": {
+		"@calendar/shared": "workspace:*",
+		"@manacore/shared-auth": "workspace:*",
+		"@manacore/shared-auth-ui": "workspace:*",
+		"@manacore/shared-branding": "workspace:*",
+		"@manacore/shared-feedback-service": "workspace:*",
+		"@manacore/shared-feedback-ui": "workspace:*",
+		"@manacore/shared-i18n": "workspace:*",
+		"@manacore/shared-icons": "workspace:*",
+		"@manacore/shared-profile-ui": "workspace:*",
+		"@manacore/shared-subscription-ui": "workspace:*",
+		"@manacore/shared-tailwind": "workspace:*",
+		"@manacore/shared-theme": "workspace:*",
+		"@manacore/shared-theme-ui": "workspace:*",
+		"@manacore/shared-ui": "workspace:*",
+		"date-fns": "^4.1.0",
+		"svelte-i18n": "^4.0.1"
+	},
+	"type": "module"
+}
diff --git a/apps/calendar/apps/web/src/app.css b/apps/calendar/apps/web/src/app.css
new file mode 100644
index 000000000..d151d09b7
--- /dev/null
+++ b/apps/calendar/apps/web/src/app.css
@@ -0,0 +1,218 @@
+@import "tailwindcss";
+@import "@manacore/shared-tailwind/themes.css";
+
+/* Scan shared packages for Tailwind classes */
+@source "../../../../packages/shared/src";
+
+/* Calendar-specific CSS Variables */
+@layer base {
+	:root {
+		/* Spacing */
+		--spacing-xs: 0.25rem;
+		--spacing-sm: 0.5rem;
+		--spacing-md: 1rem;
+		--spacing-lg: 1.5rem;
+		--spacing-xl: 2rem;
+		--spacing-2xl: 3rem;
+
+		/* Border Radius */
+		--radius-sm: 0.25rem;
+		--radius-md: 0.5rem;
+		--radius-lg: 0.75rem;
+		--radius-xl: 1rem;
+		--radius-full: 9999px;
+
+		/* Transitions */
+		--transition-fast: 150ms ease;
+		--transition-base: 200ms ease;
+		--transition-slow: 300ms ease;
+
+		/* Calendar-specific */
+		--hour-height: 60px;
+		--day-header-height: 48px;
+		--time-column-width: 64px;
+	}
+}
+
+/* Calendar Grid Styles */
+@layer components {
+	/* Hour slot in day/week view */
+	.hour-slot {
+		height: var(--hour-height);
+		border-bottom: 1px solid hsl(var(--border) / 0.5);
+		position: relative;
+	}
+
+	.hour-slot:hover {
+		background-color: hsl(var(--muted) / 0.3);
+	}
+
+	/* Event card in calendar */
+	.event-card {
+		background-color: hsl(var(--primary));
+		color: hsl(var(--primary-foreground));
+		border-radius: var(--radius-sm);
+		padding: 2px 6px;
+		font-size: 0.75rem;
+		overflow: hidden;
+		cursor: pointer;
+		transition: transform var(--transition-fast), box-shadow var(--transition-fast);
+	}
+
+	.event-card:hover {
+		transform: scale(1.02);
+		box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+	}
+
+	/* Day cell in month view */
+	.day-cell {
+		min-height: 100px;
+		border: 1px solid hsl(var(--border));
+		padding: var(--spacing-xs);
+		transition: background-color var(--transition-fast);
+	}
+
+	.day-cell:hover {
+		background-color: hsl(var(--muted) / 0.3);
+	}
+
+	.day-cell.today {
+		background-color: hsl(var(--primary) / 0.1);
+	}
+
+	.day-cell.other-month {
+		opacity: 0.5;
+	}
+
+	/* Time indicator (current time line) */
+	.time-indicator {
+		position: absolute;
+		left: 0;
+		right: 0;
+		height: 2px;
+		background-color: hsl(var(--destructive));
+		z-index: 10;
+	}
+
+	.time-indicator::before {
+		content: '';
+		position: absolute;
+		left: -4px;
+		top: -4px;
+		width: 10px;
+		height: 10px;
+		border-radius: 50%;
+		background-color: hsl(var(--destructive));
+	}
+
+	/* Mini calendar */
+	.mini-calendar {
+		font-size: 0.875rem;
+	}
+
+	.mini-calendar .day {
+		width: 28px;
+		height: 28px;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		border-radius: var(--radius-full);
+		cursor: pointer;
+		transition: all var(--transition-fast);
+	}
+
+	.mini-calendar .day:hover {
+		background-color: hsl(var(--muted));
+	}
+
+	.mini-calendar .day.today {
+		background-color: hsl(var(--primary));
+		color: hsl(var(--primary-foreground));
+	}
+
+	.mini-calendar .day.selected {
+		border: 2px solid hsl(var(--primary));
+	}
+
+	/* Card styles */
+	.card {
+		background-color: hsl(var(--card));
+		border-radius: var(--radius-lg);
+		padding: var(--spacing-lg);
+		border: 1px solid hsl(var(--border));
+	}
+
+	/* Button styles */
+	.btn {
+		padding: var(--spacing-sm) var(--spacing-lg);
+		border-radius: var(--radius-md);
+		font-weight: 500;
+		transition: all var(--transition-base);
+		cursor: pointer;
+		border: none;
+	}
+
+	.btn-primary {
+		background: hsl(var(--primary));
+		color: hsl(var(--primary-foreground));
+	}
+
+	.btn-primary:hover {
+		background: hsl(var(--primary) / 0.9);
+	}
+
+	.btn-secondary {
+		background: hsl(var(--secondary));
+		color: hsl(var(--secondary-foreground));
+	}
+
+	.btn-secondary:hover {
+		background: hsl(var(--secondary) / 0.8);
+	}
+
+	.btn-ghost {
+		background: transparent;
+		color: hsl(var(--foreground));
+	}
+
+	.btn-ghost:hover {
+		background: hsl(var(--muted));
+	}
+
+	/* Input styles */
+	.input {
+		padding: var(--spacing-sm) var(--spacing-md);
+		border: 2px solid hsl(var(--border));
+		border-radius: var(--radius-md);
+		background-color: hsl(var(--background));
+		color: hsl(var(--foreground));
+		transition: border-color var(--transition-fast);
+		width: 100%;
+	}
+
+	.input:focus {
+		outline: none;
+		border-color: hsl(var(--primary));
+	}
+}
+
+/* Scrollbar styling */
+@layer utilities {
+	.scrollbar-thin::-webkit-scrollbar {
+		width: 6px;
+		height: 6px;
+	}
+
+	.scrollbar-thin::-webkit-scrollbar-track {
+		background: transparent;
+	}
+
+	.scrollbar-thin::-webkit-scrollbar-thumb {
+		background-color: hsl(var(--muted-foreground) / 0.3);
+		border-radius: 3px;
+	}
+
+	.scrollbar-thin::-webkit-scrollbar-thumb:hover {
+		background-color: hsl(var(--muted-foreground) / 0.5);
+	}
+}
diff --git a/apps/calendar/apps/web/src/app.html b/apps/calendar/apps/web/src/app.html
new file mode 100644
index 000000000..cff15d4b6
--- /dev/null
+++ b/apps/calendar/apps/web/src/app.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<link rel="icon" href="%sveltekit.assets%/favicon.png" />
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		<title>Calendar</title>
+		%sveltekit.head%
+	</head>
+	<body data-sveltekit-preload-data="hover">
+		<div style="display: contents">%sveltekit.body%</div>
+	</body>
+</html>
diff --git a/apps/calendar/apps/web/src/lib/api/calendars.ts b/apps/calendar/apps/web/src/lib/api/calendars.ts
new file mode 100644
index 000000000..3c46b5457
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/api/calendars.ts
@@ -0,0 +1,34 @@
+/**
+ * Calendar API Client
+ */
+
+import { fetchApi } from './client';
+import type { Calendar, CreateCalendarInput, UpdateCalendarInput } from '@calendar/shared';
+
+export async function getCalendars() {
+	return fetchApi<Calendar[]>('/calendars');
+}
+
+export async function getCalendar(id: string) {
+	return fetchApi<Calendar>(`/calendars/${id}`);
+}
+
+export async function createCalendar(data: CreateCalendarInput) {
+	return fetchApi<Calendar>('/calendars', {
+		method: 'POST',
+		body: data,
+	});
+}
+
+export async function updateCalendar(id: string, data: UpdateCalendarInput) {
+	return fetchApi<Calendar>(`/calendars/${id}`, {
+		method: 'PUT',
+		body: data,
+	});
+}
+
+export async function deleteCalendar(id: string) {
+	return fetchApi<void>(`/calendars/${id}`, {
+		method: 'DELETE',
+	});
+}
diff --git a/apps/calendar/apps/web/src/lib/api/client.ts b/apps/calendar/apps/web/src/lib/api/client.ts
new file mode 100644
index 000000000..91e1fa9d6
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/api/client.ts
@@ -0,0 +1,67 @@
+/**
+ * API Client for Calendar Backend
+ */
+
+import { browser } from '$app/environment';
+import { env } from '$env/dynamic/public';
+
+const API_BASE = env.PUBLIC_BACKEND_URL || 'http://localhost:3014';
+
+type FetchOptions = {
+	method?: 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE';
+	body?: unknown;
+	token?: string;
+	isFormData?: boolean;
+};
+
+export async function fetchApi<T>(
+	endpoint: string,
+	options: FetchOptions = {}
+): Promise<{ data: T | null; error: Error | null }> {
+	const { method = 'GET', body, token, isFormData = false } = options;
+
+	let authToken = token;
+	if (!authToken && browser) {
+		authToken = localStorage.getItem('@auth/appToken') || undefined;
+	}
+
+	try {
+		const headers: Record<string, string> = {};
+
+		// Don't set Content-Type for FormData - browser sets it automatically with boundary
+		if (!isFormData) {
+			headers['Content-Type'] = 'application/json';
+		}
+
+		if (authToken) {
+			headers['Authorization'] = `Bearer ${authToken}`;
+		}
+
+		const response = await fetch(`${API_BASE}/api/v1${endpoint}`, {
+			method,
+			headers,
+			body: isFormData ? (body as FormData) : body ? JSON.stringify(body) : undefined,
+		});
+
+		if (!response.ok) {
+			const errorData = await response.json().catch(() => ({}));
+			return {
+				data: null,
+				error: new Error(errorData.message || `API error: ${response.status}`),
+			};
+		}
+
+		// Handle empty responses (204 No Content)
+		if (response.status === 204) {
+			return { data: null, error: null };
+		}
+
+		const data = await response.json();
+		return { data, error: null };
+	} catch (error) {
+		return {
+			data: null,
+			error: error instanceof Error ? error : new Error('Unknown error'),
+		};
+	}
+}
diff --git a/apps/calendar/apps/web/src/lib/api/events.ts b/apps/calendar/apps/web/src/lib/api/events.ts
new file mode 100644
index 000000000..085c9aa2a
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/api/events.ts
@@ -0,0 +1,51 @@
+/**
+ * Events API Client
+ */
+
+import { fetchApi } from './client';
+import type { CalendarEvent, CreateEventInput, UpdateEventInput } from '@calendar/shared';
+
+export interface QueryEventsParams {
+	startDate: string;
+	endDate: string;
+	calendarIds?: string[];
+}
+
+export async function getEvents(params: QueryEventsParams) {
+	const searchParams = new URLSearchParams({
+		startDate: params.startDate,
+		endDate: params.endDate,
+	});
+	if (params.calendarIds?.length) {
+		searchParams.set('calendarIds', params.calendarIds.join(','));
+	}
+	return fetchApi<CalendarEvent[]>(`/events?${searchParams.toString()}`);
+}
+
+export async function getEvent(id: string) {
+	return fetchApi<CalendarEvent>(`/events/${id}`);
+}
+
+export async function getEventsByCalendar(calendarId: string) {
+	return fetchApi<CalendarEvent[]>(`/events/calendar/${calendarId}`);
+}
+
+export async function createEvent(data: CreateEventInput) {
+	return fetchApi<CalendarEvent>('/events', {
+		method: 'POST',
+		body: data,
+	});
+}
+
+export async function updateEvent(id: string, data: UpdateEventInput) {
+	return fetchApi<CalendarEvent>(`/events/${id}`, {
+		method: 'PUT',
+		body: data,
+	});
+}
+
+export async function deleteEvent(id: string) {
+	return fetchApi<void>(`/events/${id}`, {
+		method: 'DELETE',
+	});
+}
diff --git a/apps/calendar/apps/web/src/lib/api/reminders.ts b/apps/calendar/apps/web/src/lib/api/reminders.ts
new file mode 100644
index 000000000..c932f9a3a
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/api/reminders.ts
@@ -0,0 +1,23 @@
+/**
+ * Reminders API Client
+ */
+
+import { fetchApi } from './client';
+import type { Reminder, CreateReminderInput } from '@calendar/shared';
+
+export async function getReminders(eventId: string) {
+	return fetchApi<Reminder[]>(`/events/${eventId}/reminders`);
+}
+
+export async function createReminder(eventId: string, data: CreateReminderInput) {
+	return fetchApi<Reminder>(`/events/${eventId}/reminders`, {
+		method: 'POST',
+		body: data,
+	});
+}
+
+export async function deleteReminder(id: string) {
+	return fetchApi<void>(`/reminders/${id}`, {
+		method: 'DELETE',
+	});
+}
diff --git a/apps/calendar/apps/web/src/lib/api/shares.ts b/apps/calendar/apps/web/src/lib/api/shares.ts
new file mode 100644
index 000000000..24c6472c7
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/api/shares.ts
@@ -0,0 +1,42 @@
+/**
+ * Calendar Shares API Client
+ */
+
+import { fetchApi } from './client';
+import type { CalendarShare, CreateShareInput, UpdateShareInput } from '@calendar/shared';
+
+export async function getShares(calendarId: string) {
+	return fetchApi<CalendarShare[]>(`/calendars/${calendarId}/shares`);
+}
+
+export async function createShare(calendarId: string, data: CreateShareInput) {
+	return fetchApi<CalendarShare>(`/calendars/${calendarId}/shares`, {
+		method: 'POST',
+		body: data,
+	});
+}
+
+export async function acceptShare(shareId: string) {
+	return fetchApi<CalendarShare>(`/shares/${shareId}/accept`, {
+		method: 'POST',
+	});
+}
+
+export async function declineShare(shareId: string) {
+	return fetchApi<void>(`/shares/${shareId}/decline`, {
+		method: 'POST',
+	});
+}
+
+export async function updateShare(shareId: string, data: UpdateShareInput) {
+	return fetchApi<CalendarShare>(`/shares/${shareId}`, {
+		method: 'PUT',
+		body: data,
+	});
+}
+
+export async function deleteShare(shareId: string) {
+	return fetchApi<void>(`/shares/${shareId}`, {
+		method: 'DELETE',
+	});
+}
diff --git a/apps/calendar/apps/web/src/lib/components/ToastContainer.svelte b/apps/calendar/apps/web/src/lib/components/ToastContainer.svelte
new file mode 100644
index 000000000..6b48bcc5b
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/components/ToastContainer.svelte
@@ -0,0 +1,187 @@
+<script lang="ts">
+	import { toast, type Toast } from '$lib/stores/toast';
+	import { fly } from 'svelte/transition';
+
+	let toasts = $state<Toast[]>([]);
+
+	toast.subscribe((value) => {
+		toasts = value;
+	});
+
+	function handleClose(id: string) {
+		toast.remove(id);
+	}
+
+	function getIcon(type: Toast['type']) {
+		switch (type) {
+			case 'success':
+				return `<svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+          <path d="M22 11.08V12a10 10 0 1 1-5.93-9.14"></path>
+          <polyline points="22 4 12 14.01 9 11.01"></polyline>
+        </svg>`;
+			case 'error':
+				return `<svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+          <circle cx="12" cy="12" r="10"></circle>
+          <line x1="15" y1="9" x2="9" y2="15"></line>
+          <line x1="9" y1="9" x2="15" y2="15"></line>
+        </svg>`;
+			case 'warning':
+				return `<svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+          <path d="M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z"></path>
+          <line x1="12" y1="9" x2="12" y2="13"></line>
+          <line x1="12" y1="17" x2="12.01" y2="17"></line>
+        </svg>`;
+			case 'info':
+			default:
+				return `<svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+          <circle cx="12" cy="12" r="10"></circle>
+          <line x1="12" y1="16" x2="12" y2="12"></line>
+          <line x1="12" y1="8" x2="12.01" y2="8"></line>
+        </svg>`;
+		}
+	}
+</script>
+
+<div class="toast-container">
+	{#each toasts as toastItem (toastItem.id)}
+		<div
+			class="toast toast-{toastItem.type}"
+			transition:fly={{ y: 20, duration: 300 }}
+			role="alert"
+		>
+			<div class="toast-icon">
+				{@html getIcon(toastItem.type)}
+			</div>
+			<p class="toast-message">{toastItem.message}</p>
+			<button
+				class="toast-close"
+				onclick={() => handleClose(toastItem.id)}
+				aria-label="Close notification"
+			>
+				<svg
+					width="16"
+					height="16"
+					viewBox="0 0 24 24"
+					fill="none"
+					stroke="currentColor"
+					stroke-width="2"
+				>
+					<line x1="18" y1="6" x2="6" y2="18"></line>
+					<line x1="6" y1="6" x2="18" y2="18"></line>
+				</svg>
+			</button>
+		</div>
+	{/each}
+</div>
+
+<style>
+	.toast-container {
+		position: fixed;
+		bottom: 2rem;
+		right: 2rem;
+		z-index: 9999;
+		display: flex;
+		flex-direction: column;
+		gap: 0.5rem;
+		pointer-events: none;
+	}
+
+	.toast {
+		display: flex;
+		align-items: center;
+		gap: 1rem;
+		padding: 1rem 1.5rem;
+		background: hsl(var(--card));
+		border-radius: 0.75rem;
+		box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
+		border: 1px solid hsl(var(--border));
+		min-width: 300px;
+		max-width: 400px;
+		pointer-events: auto;
+		backdrop-filter: blur(10px);
+	}
+
+	.toast-icon {
+		flex-shrink: 0;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+	}
+
+	.toast-success {
+		border-left: 4px solid hsl(142.1 76.2% 36.3%);
+	}
+
+	.toast-success .toast-icon {
+		color: hsl(142.1 76.2% 36.3%);
+	}
+
+	.toast-error {
+		border-left: 4px solid hsl(var(--destructive));
+	}
+
+	.toast-error .toast-icon {
+		color: hsl(var(--destructive));
+	}
+
+	.toast-warning {
+		border-left: 4px solid hsl(47.9 95.8% 53.1%);
+	}
+
+	.toast-warning .toast-icon {
+		color: hsl(47.9 95.8% 53.1%);
+	}
+
+	.toast-info {
+		border-left: 4px solid hsl(var(--primary));
+	}
+
+	.toast-info .toast-icon {
+		color: hsl(var(--primary));
+	}
+
+	.toast-message {
+		flex: 1;
+		margin: 0;
+		font-size: 0.9375rem;
+		color: hsl(var(--foreground));
+		line-height: 1.5;
+	}
+
+	.toast-close {
+		flex-shrink: 0;
+		background: none;
+		border: none;
+		padding: 0.25rem;
+		cursor: pointer;
+		color: hsl(var(--muted-foreground));
+		transition: all 150ms ease;
+		border-radius: 0.25rem;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+	}
+
+	.toast-close:hover {
+		background: hsl(var(--muted));
+		color: hsl(var(--foreground));
+	}
+
+	@media (max-width: 768px) {
+		.toast-container {
+			bottom: 6rem;
+			right: 1rem;
+			left: 1rem;
+			align-items: stretch;
+		}
+
+		.toast {
+			min-width: auto;
+			max-width: none;
+		}
+
+		.toast-message {
+			font-size: 0.875rem;
+		}
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/lib/components/calendar/CalendarHeader.svelte b/apps/calendar/apps/web/src/lib/components/calendar/CalendarHeader.svelte
new file mode 100644
index 000000000..92b511c70
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/components/calendar/CalendarHeader.svelte
@@ -0,0 +1,164 @@
+<script lang="ts">
+	import { viewStore } from '$lib/stores/view.svelte';
+	import { format } from 'date-fns';
+	import { de } from 'date-fns/locale';
+	import type { CalendarViewType } from '@calendar/shared';
+
+	// View type labels
+	const viewLabels: Record<CalendarViewType, string> = {
+		day: 'Tag',
+		week: 'Woche',
+		month: 'Monat',
+		year: 'Jahr',
+		agenda: 'Agenda',
+	};
+
+	// Format title based on view type
+	let title = $derived.by(() => {
+		const date = viewStore.currentDate;
+		switch (viewStore.viewType) {
+			case 'day':
+				return format(date, 'EEEE, d. MMMM yyyy', { locale: de });
+			case 'week':
+				const weekStart = viewStore.viewRange.start;
+				const weekEnd = viewStore.viewRange.end;
+				if (weekStart.getMonth() === weekEnd.getMonth()) {
+					return format(weekStart, 'd.', { locale: de }) + ' - ' + format(weekEnd, 'd. MMMM yyyy', { locale: de });
+				}
+				return format(weekStart, 'd. MMM', { locale: de }) + ' - ' + format(weekEnd, 'd. MMM yyyy', { locale: de });
+			case 'month':
+				return format(date, 'MMMM yyyy', { locale: de });
+			case 'year':
+				return format(date, 'yyyy', { locale: de });
+			case 'agenda':
+				return 'Agenda';
+			default:
+				return format(date, 'MMMM yyyy', { locale: de });
+		}
+	});
+
+	function handleViewChange(type: CalendarViewType) {
+		viewStore.setViewType(type);
+	}
+</script>
+
+<header class="calendar-header">
+	<div class="header-left">
+		<button class="btn btn-ghost" onclick={() => viewStore.goToToday()}>
+			Heute
+		</button>
+
+		<div class="nav-buttons">
+			<button class="btn btn-ghost btn-icon" onclick={() => viewStore.goToPrevious()} aria-label="Zurück">
+				<svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+					<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7" />
+				</svg>
+			</button>
+			<button class="btn btn-ghost btn-icon" onclick={() => viewStore.goToNext()} aria-label="Weiter">
+				<svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+					<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" />
+				</svg>
+			</button>
+		</div>
+
+		<h1 class="header-title">{title}</h1>
+	</div>
+
+	<div class="header-right">
+		<div class="view-selector">
+			{#each (['day', 'week', 'month'] as const) as type}
+				<button
+					class="view-btn"
+					class:active={viewStore.viewType === type}
+					onclick={() => handleViewChange(type)}
+				>
+					{viewLabels[type]}
+				</button>
+			{/each}
+		</div>
+	</div>
+</header>
+
+<style>
+	.calendar-header {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		padding: 1rem 1.5rem;
+		border-bottom: 1px solid hsl(var(--border));
+		background: hsl(var(--card));
+	}
+
+	.header-left {
+		display: flex;
+		align-items: center;
+		gap: 1rem;
+	}
+
+	.nav-buttons {
+		display: flex;
+		gap: 0.25rem;
+	}
+
+	.header-title {
+		font-size: 1.25rem;
+		font-weight: 600;
+		color: hsl(var(--foreground));
+		margin: 0;
+	}
+
+	.header-right {
+		display: flex;
+		align-items: center;
+		gap: 1rem;
+	}
+
+	.view-selector {
+		display: flex;
+		background: hsl(var(--muted));
+		border-radius: var(--radius-md);
+		padding: 0.25rem;
+	}
+
+	.view-btn {
+		padding: 0.5rem 1rem;
+		border: none;
+		background: transparent;
+		border-radius: var(--radius-sm);
+		font-size: 0.875rem;
+		font-weight: 500;
+		color: hsl(var(--muted-foreground));
+		cursor: pointer;
+		transition: all 150ms ease;
+	}
+
+	.view-btn:hover {
+		color: hsl(var(--foreground));
+	}
+
+	.view-btn.active {
+		background: hsl(var(--background));
+		color: hsl(var(--foreground));
+		box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
+	}
+
+	.btn-icon {
+		padding: 0.5rem;
+	}
+
+	@media (max-width: 640px) {
+		.calendar-header {
+			flex-direction: column;
+			gap: 1rem;
+		}
+
+		.header-left {
+			width: 100%;
+			justify-content: space-between;
+		}
+
+		.header-title {
+			font-size: 1rem;
+		}
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/lib/components/calendar/CalendarSidebar.svelte b/apps/calendar/apps/web/src/lib/components/calendar/CalendarSidebar.svelte
new file mode 100644
index 000000000..0cef56601
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/components/calendar/CalendarSidebar.svelte
@@ -0,0 +1,122 @@
+<script lang="ts">
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import { goto } from '$app/navigation';
+
+	function handleToggle(calendarId: string) {
+		calendarsStore.toggleVisibility(calendarId);
+	}
+
+	function handleAddCalendar() {
+		goto('/calendars/new');
+	}
+</script>
+
+<div class="calendar-sidebar-section">
+	<div class="section-header">
+		<h3 class="section-title">Meine Kalender</h3>
+		<button class="add-btn" onclick={handleAddCalendar} aria-label="Kalender hinzufügen">
+			<svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+				<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4" />
+			</svg>
+		</button>
+	</div>
+
+	<div class="calendar-list">
+		{#each calendarsStore.calendars as calendar}
+			<label class="calendar-item">
+				<input
+					type="checkbox"
+					checked={calendar.isVisible}
+					onchange={() => handleToggle(calendar.id)}
+					style="accent-color: {calendar.color}"
+				/>
+				<span class="color-dot" style="background-color: {calendar.color}"></span>
+				<span class="calendar-name">{calendar.name}</span>
+			</label>
+		{/each}
+
+		{#if calendarsStore.calendars.length === 0}
+			<p class="empty-message">Keine Kalender vorhanden</p>
+		{/if}
+	</div>
+</div>
+
+<style>
+	.calendar-sidebar-section {
+		background: hsl(var(--card));
+		border-radius: var(--radius-lg);
+		border: 1px solid hsl(var(--border));
+		padding: 1rem;
+	}
+
+	.section-header {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		margin-bottom: 0.75rem;
+	}
+
+	.section-title {
+		font-size: 0.875rem;
+		font-weight: 600;
+		color: hsl(var(--foreground));
+		margin: 0;
+	}
+
+	.add-btn {
+		padding: 0.25rem;
+		border: none;
+		background: transparent;
+		border-radius: var(--radius-sm);
+		cursor: pointer;
+		color: hsl(var(--muted-foreground));
+	}
+
+	.add-btn:hover {
+		background: hsl(var(--muted));
+		color: hsl(var(--foreground));
+	}
+
+	.calendar-list {
+		display: flex;
+		flex-direction: column;
+		gap: 0.5rem;
+	}
+
+	.calendar-item {
+		display: flex;
+		align-items: center;
+		gap: 0.5rem;
+		cursor: pointer;
+		padding: 0.25rem;
+		border-radius: var(--radius-sm);
+	}
+
+	.calendar-item:hover {
+		background: hsl(var(--muted) / 0.5);
+	}
+
+	.calendar-item input {
+		width: 16px;
+		height: 16px;
+		cursor: pointer;
+	}
+
+	.color-dot {
+		width: 12px;
+		height: 12px;
+		border-radius: var(--radius-full);
+	}
+
+	.calendar-name {
+		font-size: 0.875rem;
+		color: hsl(var(--foreground));
+	}
+
+	.empty-message {
+		font-size: 0.875rem;
+		color: hsl(var(--muted-foreground));
+		text-align: center;
+		padding: 1rem;
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/lib/components/calendar/DayView.svelte b/apps/calendar/apps/web/src/lib/components/calendar/DayView.svelte
new file mode 100644
index 000000000..d3bf3f48a
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/components/calendar/DayView.svelte
@@ -0,0 +1,232 @@
+<script lang="ts">
+	import { viewStore } from '$lib/stores/view.svelte';
+	import { eventsStore } from '$lib/stores/events.svelte';
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import { goto } from '$app/navigation';
+	import {
+		format,
+		isToday,
+		parseISO,
+		differenceInMinutes,
+	} from 'date-fns';
+	import { de } from 'date-fns/locale';
+
+	let hours = Array.from({ length: 24 }, (_, i) => i);
+
+	// Current time indicator position
+	let now = $state(new Date());
+	let currentTimePosition = $derived.by(() => {
+		const minutes = now.getHours() * 60 + now.getMinutes();
+		return (minutes / (24 * 60)) * 100;
+	});
+
+	// Update current time every minute
+	$effect(() => {
+		const interval = setInterval(() => {
+			now = new Date();
+		}, 60000);
+		return () => clearInterval(interval);
+	});
+
+	let timedEvents = $derived(
+		eventsStore.getEventsForDay(viewStore.currentDate).filter((e) => !e.isAllDay)
+	);
+
+	let allDayEvents = $derived(
+		eventsStore.getEventsForDay(viewStore.currentDate).filter((e) => e.isAllDay)
+	);
+
+	function getEventStyle(event: any) {
+		const start = typeof event.startTime === 'string' ? parseISO(event.startTime) : event.startTime;
+		const end = typeof event.endTime === 'string' ? parseISO(event.endTime) : event.endTime;
+
+		const startMinutes = start.getHours() * 60 + start.getMinutes();
+		const duration = differenceInMinutes(end, start);
+
+		const top = (startMinutes / (24 * 60)) * 100;
+		const height = Math.max((duration / (24 * 60)) * 100, 2);
+
+		const color = calendarsStore.getColor(event.calendarId);
+
+		return `top: ${top}%; height: ${height}%; background-color: ${color};`;
+	}
+
+	function handleEventClick(event: any) {
+		goto(`/event/${event.id}`);
+	}
+
+	function handleSlotClick(hour: number) {
+		const startTime = new Date(viewStore.currentDate);
+		startTime.setHours(hour, 0, 0, 0);
+		goto(`/event/new?start=${startTime.toISOString()}`);
+	}
+</script>
+
+<div class="day-view">
+	<!-- All-day events -->
+	{#if allDayEvents.length > 0}
+		<div class="all-day-section">
+			<div class="time-gutter">
+				<span class="all-day-label">Ganztägig</span>
+			</div>
+			<div class="all-day-events">
+				{#each allDayEvents as event}
+					<button
+						class="all-day-event"
+						style="background-color: {calendarsStore.getColor(event.calendarId)}"
+						onclick={() => handleEventClick(event)}
+					>
+						{event.title}
+					</button>
+				{/each}
+			</div>
+		</div>
+	{/if}
+
+	<!-- Time grid -->
+	<div class="time-grid scrollbar-thin">
+		<div class="time-column">
+			{#each hours as hour}
+				<div class="time-label">
+					{hour.toString().padStart(2, '0')}:00
+				</div>
+			{/each}
+		</div>
+
+		<div class="day-column" class:today={isToday(viewStore.currentDate)}>
+			{#each hours as hour}
+				<button
+					class="hour-slot"
+					onclick={() => handleSlotClick(hour)}
+					aria-label={`${hour}:00 Uhr`}
+				></button>
+			{/each}
+
+			<!-- Events -->
+			{#each timedEvents as event}
+				<button
+					class="event-card"
+					style={getEventStyle(event)}
+					onclick={() => handleEventClick(event)}
+				>
+					<span class="event-time">
+						{format(typeof event.startTime === 'string' ? parseISO(event.startTime) : event.startTime, 'HH:mm')} -
+						{format(typeof event.endTime === 'string' ? parseISO(event.endTime) : event.endTime, 'HH:mm')}
+					</span>
+					<span class="event-title">{event.title}</span>
+					{#if event.location}
+						<span class="event-location">{event.location}</span>
+					{/if}
+				</button>
+			{/each}
+
+			<!-- Current time indicator -->
+			{#if isToday(viewStore.currentDate)}
+				<div class="time-indicator" style="top: {currentTimePosition}%"></div>
+			{/if}
+		</div>
+	</div>
+</div>
+
+<style>
+	.day-view {
+		display: flex;
+		flex-direction: column;
+		height: 100%;
+	}
+
+	.all-day-section {
+		display: flex;
+		border-bottom: 1px solid hsl(var(--border));
+		padding: 0.5rem 0;
+	}
+
+	.all-day-label {
+		font-size: 0.75rem;
+		color: hsl(var(--muted-foreground));
+	}
+
+	.all-day-events {
+		flex: 1;
+		display: flex;
+		flex-wrap: wrap;
+		gap: 4px;
+		padding: 0 0.5rem;
+	}
+
+	.all-day-event {
+		padding: 4px 8px;
+		font-size: 0.875rem;
+		color: white;
+		border-radius: var(--radius-sm);
+		border: none;
+		cursor: pointer;
+	}
+
+	.time-grid {
+		flex: 1;
+		display: flex;
+		overflow-y: auto;
+	}
+
+	.time-column {
+		width: var(--time-column-width);
+		flex-shrink: 0;
+	}
+
+	.time-label {
+		height: var(--hour-height);
+		padding-right: 0.5rem;
+		text-align: right;
+		font-size: 0.75rem;
+		color: hsl(var(--muted-foreground));
+		position: relative;
+		top: -0.5em;
+	}
+
+	.time-gutter {
+		width: var(--time-column-width);
+		flex-shrink: 0;
+		padding-right: 0.5rem;
+		text-align: right;
+	}
+
+	.day-column {
+		flex: 1;
+		position: relative;
+		border-left: 1px solid hsl(var(--border));
+	}
+
+	.day-column.today {
+		background: hsl(var(--primary) / 0.05);
+	}
+
+	.event-card {
+		position: absolute;
+		left: 4px;
+		right: 4px;
+		color: white;
+		border: none;
+		text-align: left;
+		cursor: pointer;
+		z-index: 1;
+		display: flex;
+		flex-direction: column;
+		gap: 2px;
+	}
+
+	.event-time {
+		font-size: 0.75rem;
+		opacity: 0.9;
+	}
+
+	.event-title {
+		font-size: 0.875rem;
+		font-weight: 500;
+	}
+
+	.event-location {
+		font-size: 0.75rem;
+		opacity: 0.8;
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/lib/components/calendar/MiniCalendar.svelte b/apps/calendar/apps/web/src/lib/components/calendar/MiniCalendar.svelte
new file mode 100644
index 000000000..f302905f9
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/components/calendar/MiniCalendar.svelte
@@ -0,0 +1,165 @@
+<script lang="ts">
+	import {
+		format,
+		startOfMonth,
+		endOfMonth,
+		startOfWeek,
+		endOfWeek,
+		eachDayOfInterval,
+		isSameMonth,
+		isToday,
+		isSameDay,
+		addMonths,
+		subMonths,
+	} from 'date-fns';
+	import { de } from 'date-fns/locale';
+
+	interface Props {
+		selectedDate: Date;
+		onDateSelect: (date: Date) => void;
+	}
+
+	let { selectedDate, onDateSelect }: Props = $props();
+
+	let currentMonth = $state(new Date());
+
+	// Get all days to display
+	let calendarDays = $derived.by(() => {
+		const monthStart = startOfMonth(currentMonth);
+		const monthEnd = endOfMonth(currentMonth);
+		const calendarStart = startOfWeek(monthStart, { weekStartsOn: 1 });
+		const calendarEnd = endOfWeek(monthEnd, { weekStartsOn: 1 });
+
+		return eachDayOfInterval({ start: calendarStart, end: calendarEnd });
+	});
+
+	const weekDays = ['Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa', 'So'];
+
+	function previousMonth() {
+		currentMonth = subMonths(currentMonth, 1);
+	}
+
+	function nextMonth() {
+		currentMonth = addMonths(currentMonth, 1);
+	}
+
+	function handleDayClick(day: Date) {
+		onDateSelect(day);
+	}
+</script>
+
+<div class="mini-calendar card">
+	<div class="calendar-header">
+		<button class="nav-btn" onclick={previousMonth} aria-label="Vorheriger Monat">
+			<svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+				<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7" />
+			</svg>
+		</button>
+		<span class="month-label">{format(currentMonth, 'MMMM yyyy', { locale: de })}</span>
+		<button class="nav-btn" onclick={nextMonth} aria-label="Nächster Monat">
+			<svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+				<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" />
+			</svg>
+		</button>
+	</div>
+
+	<div class="weekday-row">
+		{#each weekDays as day}
+			<span class="weekday">{day}</span>
+		{/each}
+	</div>
+
+	<div class="days-grid">
+		{#each calendarDays as day}
+			<button
+				class="day"
+				class:other-month={!isSameMonth(day, currentMonth)}
+				class:today={isToday(day)}
+				class:selected={isSameDay(day, selectedDate)}
+				onclick={() => handleDayClick(day)}
+			>
+				{format(day, 'd')}
+			</button>
+		{/each}
+	</div>
+</div>
+
+<style>
+	.calendar-header {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		margin-bottom: 0.75rem;
+	}
+
+	.month-label {
+		font-weight: 600;
+		font-size: 0.875rem;
+	}
+
+	.nav-btn {
+		padding: 0.25rem;
+		border: none;
+		background: transparent;
+		border-radius: var(--radius-sm);
+		cursor: pointer;
+		color: hsl(var(--muted-foreground));
+	}
+
+	.nav-btn:hover {
+		background: hsl(var(--muted));
+		color: hsl(var(--foreground));
+	}
+
+	.weekday-row {
+		display: grid;
+		grid-template-columns: repeat(7, 1fr);
+		margin-bottom: 0.25rem;
+	}
+
+	.weekday {
+		text-align: center;
+		font-size: 0.75rem;
+		color: hsl(var(--muted-foreground));
+		font-weight: 500;
+	}
+
+	.days-grid {
+		display: grid;
+		grid-template-columns: repeat(7, 1fr);
+		gap: 2px;
+	}
+
+	.day {
+		width: 28px;
+		height: 28px;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		border-radius: var(--radius-full);
+		cursor: pointer;
+		font-size: 0.75rem;
+		border: none;
+		background: transparent;
+		color: hsl(var(--foreground));
+		transition: all var(--transition-fast);
+	}
+
+	.day:hover {
+		background: hsl(var(--muted));
+	}
+
+	.day.other-month {
+		color: hsl(var(--muted-foreground));
+		opacity: 0.5;
+	}
+
+	.day.today {
+		background: hsl(var(--primary));
+		color: hsl(var(--primary-foreground));
+	}
+
+	.day.selected {
+		border: 2px solid hsl(var(--primary));
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/lib/components/calendar/MonthView.svelte b/apps/calendar/apps/web/src/lib/components/calendar/MonthView.svelte
new file mode 100644
index 000000000..d71928f6e
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/components/calendar/MonthView.svelte
@@ -0,0 +1,246 @@
+<script lang="ts">
+	import { viewStore } from '$lib/stores/view.svelte';
+	import { eventsStore } from '$lib/stores/events.svelte';
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import { goto } from '$app/navigation';
+	import {
+		format,
+		startOfMonth,
+		endOfMonth,
+		startOfWeek,
+		endOfWeek,
+		eachDayOfInterval,
+		isSameMonth,
+		isToday,
+		isSameDay,
+	} from 'date-fns';
+	import { de } from 'date-fns/locale';
+
+	// Get all days to display in the month grid (including days from prev/next months)
+	let calendarDays = $derived.by(() => {
+		const monthStart = startOfMonth(viewStore.currentDate);
+		const monthEnd = endOfMonth(viewStore.currentDate);
+		const calendarStart = startOfWeek(monthStart, { weekStartsOn: 1 });
+		const calendarEnd = endOfWeek(monthEnd, { weekStartsOn: 1 });
+
+		return eachDayOfInterval({ start: calendarStart, end: calendarEnd });
+	});
+
+	// Week day headers
+	const weekDays = ['Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa', 'So'];
+
+	// Group days into weeks
+	let weeks = $derived.by(() => {
+		const result: Date[][] = [];
+		for (let i = 0; i < calendarDays.length; i += 7) {
+			result.push(calendarDays.slice(i, i + 7));
+		}
+		return result;
+	});
+
+	function getEventsForDay(day: Date) {
+		return eventsStore.getEventsForDay(day).slice(0, 3); // Max 3 events shown
+	}
+
+	function handleDayClick(day: Date) {
+		viewStore.setDate(day);
+		viewStore.setViewType('day');
+	}
+
+	function handleEventClick(event: any, e: MouseEvent) {
+		e.stopPropagation();
+		goto(`/event/${event.id}`);
+	}
+
+	function handleMoreClick(day: Date, e: MouseEvent) {
+		e.stopPropagation();
+		viewStore.setDate(day);
+		viewStore.setViewType('day');
+	}
+</script>
+
+<div class="month-view">
+	<!-- Week day headers -->
+	<div class="weekday-headers">
+		{#each weekDays as day}
+			<div class="weekday-header">{day}</div>
+		{/each}
+	</div>
+
+	<!-- Calendar grid -->
+	<div class="calendar-grid">
+		{#each weeks as week}
+			<div class="week-row">
+				{#each week as day}
+					<!-- svelte-ignore a11y_no_static_element_interactions -->
+					<div
+						class="day-cell"
+						class:other-month={!isSameMonth(day, viewStore.currentDate)}
+						class:today={isToday(day)}
+						onclick={() => handleDayClick(day)}
+						onkeydown={(e) => e.key === 'Enter' && handleDayClick(day)}
+						role="button"
+						tabindex="0"
+					>
+						<span class="day-number" class:today={isToday(day)}>
+							{format(day, 'd')}
+						</span>
+
+						<div class="day-events">
+							{#each getEventsForDay(day) as event}
+								<button
+									class="event-pill"
+									style="background-color: {calendarsStore.getColor(event.calendarId)}"
+									onclick={(e) => handleEventClick(event, e)}
+								>
+									{#if !event.isAllDay}
+										<span class="event-time">{format(typeof event.startTime === 'string' ? new Date(event.startTime) : event.startTime, 'HH:mm')}</span>
+									{/if}
+									<span class="event-title">{event.title}</span>
+								</button>
+							{/each}
+
+							{#if eventsStore.getEventsForDay(day).length > 3}
+								<button
+									class="more-events"
+									onclick={(e) => handleMoreClick(day, e)}
+								>
+									+{eventsStore.getEventsForDay(day).length - 3} mehr
+								</button>
+							{/if}
+						</div>
+					</div>
+				{/each}
+			</div>
+		{/each}
+	</div>
+</div>
+
+<style>
+	.month-view {
+		display: flex;
+		flex-direction: column;
+		height: 100%;
+	}
+
+	.weekday-headers {
+		display: grid;
+		grid-template-columns: repeat(7, 1fr);
+		border-bottom: 1px solid hsl(var(--border));
+	}
+
+	.weekday-header {
+		padding: 0.75rem;
+		text-align: center;
+		font-size: 0.75rem;
+		font-weight: 600;
+		color: hsl(var(--muted-foreground));
+		text-transform: uppercase;
+	}
+
+	.calendar-grid {
+		flex: 1;
+		display: flex;
+		flex-direction: column;
+	}
+
+	.week-row {
+		flex: 1;
+		display: grid;
+		grid-template-columns: repeat(7, 1fr);
+		min-height: 100px;
+	}
+
+	.day-cell {
+		border: 1px solid hsl(var(--border));
+		border-top: none;
+		border-left: none;
+		padding: var(--spacing-xs);
+		background: transparent;
+		cursor: pointer;
+		text-align: left;
+		display: flex;
+		flex-direction: column;
+		transition: background-color var(--transition-fast);
+	}
+
+	.day-cell:first-child {
+		border-left: 1px solid hsl(var(--border));
+	}
+
+	.day-cell:hover {
+		background-color: hsl(var(--muted) / 0.3);
+	}
+
+	.day-cell.today {
+		background-color: hsl(var(--primary) / 0.1);
+	}
+
+	.day-cell.other-month {
+		opacity: 0.5;
+	}
+
+	.day-number {
+		font-size: 0.875rem;
+		font-weight: 500;
+		width: 28px;
+		height: 28px;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		border-radius: var(--radius-full);
+		margin-bottom: 0.25rem;
+	}
+
+	.day-number.today {
+		background: hsl(var(--primary));
+		color: hsl(var(--primary-foreground));
+	}
+
+	.day-events {
+		flex: 1;
+		display: flex;
+		flex-direction: column;
+		gap: 2px;
+		overflow: hidden;
+	}
+
+	.event-pill {
+		display: flex;
+		align-items: center;
+		gap: 4px;
+		padding: 2px 6px;
+		font-size: 0.75rem;
+		color: white;
+		border-radius: var(--radius-sm);
+		border: none;
+		cursor: pointer;
+		white-space: nowrap;
+		overflow: hidden;
+		text-overflow: ellipsis;
+	}
+
+	.event-time {
+		font-size: 0.65rem;
+		opacity: 0.9;
+	}
+
+	.event-title {
+		overflow: hidden;
+		text-overflow: ellipsis;
+	}
+
+	.more-events {
+		font-size: 0.75rem;
+		color: hsl(var(--muted-foreground));
+		background: transparent;
+		border: none;
+		cursor: pointer;
+		padding: 2px;
+		text-align: left;
+	}
+
+	.more-events:hover {
+		color: hsl(var(--primary));
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/lib/components/calendar/WeekView.svelte b/apps/calendar/apps/web/src/lib/components/calendar/WeekView.svelte
new file mode 100644
index 000000000..7f9aedb14
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/components/calendar/WeekView.svelte
@@ -0,0 +1,291 @@
+<script lang="ts">
+	import { viewStore } from '$lib/stores/view.svelte';
+	import { eventsStore } from '$lib/stores/events.svelte';
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import { goto } from '$app/navigation';
+	import {
+		format,
+		eachDayOfInterval,
+		eachHourOfInterval,
+		startOfDay,
+		endOfDay,
+		isSameDay,
+		isToday,
+		parseISO,
+		differenceInMinutes,
+	} from 'date-fns';
+	import { de } from 'date-fns/locale';
+
+	// Generate days of the week
+	let days = $derived(
+		eachDayOfInterval({
+			start: viewStore.viewRange.start,
+			end: viewStore.viewRange.end,
+		})
+	);
+
+	// Generate hours (0-23)
+	let hours = Array.from({ length: 24 }, (_, i) => i);
+
+	// Current time indicator position
+	let now = $state(new Date());
+	let currentTimePosition = $derived.by(() => {
+		const minutes = now.getHours() * 60 + now.getMinutes();
+		return (minutes / (24 * 60)) * 100;
+	});
+
+	// Update current time every minute
+	$effect(() => {
+		const interval = setInterval(() => {
+			now = new Date();
+		}, 60000);
+		return () => clearInterval(interval);
+	});
+
+	function getEventsForDay(day: Date) {
+		return eventsStore.getEventsForDay(day).filter((e) => !e.isAllDay);
+	}
+
+	function getAllDayEventsForDay(day: Date) {
+		return eventsStore.getEventsForDay(day).filter((e) => e.isAllDay);
+	}
+
+	function getEventStyle(event: any) {
+		const start = typeof event.startTime === 'string' ? parseISO(event.startTime) : event.startTime;
+		const end = typeof event.endTime === 'string' ? parseISO(event.endTime) : event.endTime;
+
+		const startMinutes = start.getHours() * 60 + start.getMinutes();
+		const duration = differenceInMinutes(end, start);
+
+		const top = (startMinutes / (24 * 60)) * 100;
+		const height = Math.max((duration / (24 * 60)) * 100, 2); // Min 2% height
+
+		const color = calendarsStore.getColor(event.calendarId);
+
+		return `top: ${top}%; height: ${height}%; background-color: ${color};`;
+	}
+
+	function handleEventClick(event: any) {
+		goto(`/event/${event.id}`);
+	}
+
+	function handleSlotClick(day: Date, hour: number) {
+		const startTime = new Date(day);
+		startTime.setHours(hour, 0, 0, 0);
+		goto(`/event/new?start=${startTime.toISOString()}`);
+	}
+</script>
+
+<div class="week-view">
+	<!-- All-day events row -->
+	<div class="all-day-row">
+		<div class="time-gutter"></div>
+		{#each days as day}
+			<div class="all-day-cell">
+				{#each getAllDayEventsForDay(day) as event}
+					<button
+						class="all-day-event"
+						style="background-color: {calendarsStore.getColor(event.calendarId)}"
+						onclick={() => handleEventClick(event)}
+					>
+						{event.title}
+					</button>
+				{/each}
+			</div>
+		{/each}
+	</div>
+
+	<!-- Day headers -->
+	<div class="day-headers">
+		<div class="time-gutter"></div>
+		{#each days as day}
+			<div class="day-header" class:today={isToday(day)}>
+				<span class="day-name">{format(day, 'EEE', { locale: de })}</span>
+				<span class="day-number" class:today={isToday(day)}>{format(day, 'd')}</span>
+			</div>
+		{/each}
+	</div>
+
+	<!-- Time grid -->
+	<div class="time-grid scrollbar-thin">
+		<!-- Time column -->
+		<div class="time-column">
+			{#each hours as hour}
+				<div class="time-label">
+					{hour.toString().padStart(2, '0')}:00
+				</div>
+			{/each}
+		</div>
+
+		<!-- Day columns -->
+		<div class="days-container">
+			{#each days as day, dayIndex}
+				<div class="day-column" class:today={isToday(day)}>
+					{#each hours as hour}
+						<button
+							class="hour-slot"
+							onclick={() => handleSlotClick(day, hour)}
+							aria-label={`${format(day, 'EEEE', { locale: de })} ${hour}:00 Uhr`}
+						></button>
+					{/each}
+
+					<!-- Events -->
+					{#each getEventsForDay(day) as event}
+						<button
+							class="event-card"
+							style={getEventStyle(event)}
+							onclick={() => handleEventClick(event)}
+						>
+							<span class="event-time">
+								{format(typeof event.startTime === 'string' ? parseISO(event.startTime) : event.startTime, 'HH:mm')}
+							</span>
+							<span class="event-title">{event.title}</span>
+						</button>
+					{/each}
+
+					<!-- Current time indicator -->
+					{#if isToday(day)}
+						<div class="time-indicator" style="top: {currentTimePosition}%"></div>
+					{/if}
+				</div>
+			{/each}
+		</div>
+	</div>
+</div>
+
+<style>
+	.week-view {
+		display: flex;
+		flex-direction: column;
+		height: 100%;
+	}
+
+	.all-day-row {
+		display: flex;
+		border-bottom: 1px solid hsl(var(--border));
+		min-height: 32px;
+	}
+
+	.all-day-cell {
+		flex: 1;
+		display: flex;
+		flex-wrap: wrap;
+		gap: 2px;
+		padding: 4px;
+		border-left: 1px solid hsl(var(--border));
+	}
+
+	.all-day-event {
+		padding: 2px 6px;
+		font-size: 0.75rem;
+		color: white;
+		border-radius: var(--radius-sm);
+		white-space: nowrap;
+		overflow: hidden;
+		text-overflow: ellipsis;
+		border: none;
+		cursor: pointer;
+	}
+
+	.day-headers {
+		display: flex;
+		border-bottom: 1px solid hsl(var(--border));
+	}
+
+	.time-gutter {
+		width: var(--time-column-width);
+		flex-shrink: 0;
+	}
+
+	.day-header {
+		flex: 1;
+		display: flex;
+		flex-direction: column;
+		align-items: center;
+		padding: 0.5rem;
+		border-left: 1px solid hsl(var(--border));
+	}
+
+	.day-name {
+		font-size: 0.75rem;
+		color: hsl(var(--muted-foreground));
+		text-transform: uppercase;
+	}
+
+	.day-number {
+		font-size: 1.25rem;
+		font-weight: 600;
+		width: 36px;
+		height: 36px;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		border-radius: var(--radius-full);
+	}
+
+	.day-number.today {
+		background: hsl(var(--primary));
+		color: hsl(var(--primary-foreground));
+	}
+
+	.time-grid {
+		flex: 1;
+		display: flex;
+		overflow-y: auto;
+	}
+
+	.time-column {
+		width: var(--time-column-width);
+		flex-shrink: 0;
+	}
+
+	.time-label {
+		height: var(--hour-height);
+		padding-right: 0.5rem;
+		text-align: right;
+		font-size: 0.75rem;
+		color: hsl(var(--muted-foreground));
+		position: relative;
+		top: -0.5em;
+	}
+
+	.days-container {
+		flex: 1;
+		display: flex;
+	}
+
+	.day-column {
+		flex: 1;
+		position: relative;
+		border-left: 1px solid hsl(var(--border));
+	}
+
+	.day-column.today {
+		background: hsl(var(--primary) / 0.05);
+	}
+
+	.event-card {
+		position: absolute;
+		left: 2px;
+		right: 2px;
+		color: white;
+		border: none;
+		text-align: left;
+		cursor: pointer;
+		z-index: 1;
+	}
+
+	.event-time {
+		font-size: 0.65rem;
+		opacity: 0.9;
+	}
+
+	.event-title {
+		display: block;
+		font-size: 0.75rem;
+		font-weight: 500;
+		white-space: nowrap;
+		overflow: hidden;
+		text-overflow: ellipsis;
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/lib/components/event/EventForm.svelte b/apps/calendar/apps/web/src/lib/components/event/EventForm.svelte
new file mode 100644
index 000000000..335237230
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/components/event/EventForm.svelte
@@ -0,0 +1,219 @@
+<script lang="ts">
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import type { CalendarEvent, CreateEventInput, UpdateEventInput } from '@calendar/shared';
+	import { format, addHours, parseISO } from 'date-fns';
+
+	interface Props {
+		mode: 'create' | 'edit';
+		event?: CalendarEvent;
+		initialStartTime?: Date | null;
+		onSave: (data: CreateEventInput | UpdateEventInput) => void;
+		onCancel: () => void;
+	}
+
+	let { mode, event, initialStartTime, onSave, onCancel }: Props = $props();
+
+	// Form state
+	let title = $state(event?.title || '');
+	let description = $state(event?.description || '');
+	let location = $state(event?.location || '');
+	let isAllDay = $state(event?.isAllDay || false);
+	let calendarId = $state(event?.calendarId || calendarsStore.defaultCalendar?.id || '');
+
+	// Date/time handling
+	let startDate = $state('');
+	let startTime = $state('');
+	let endDate = $state('');
+	let endTime = $state('');
+
+	// Initialize date/time fields
+	$effect(() => {
+		if (event) {
+			const start = typeof event.startTime === 'string' ? parseISO(event.startTime) : event.startTime;
+			const end = typeof event.endTime === 'string' ? parseISO(event.endTime) : event.endTime;
+			startDate = format(start, 'yyyy-MM-dd');
+			startTime = format(start, 'HH:mm');
+			endDate = format(end, 'yyyy-MM-dd');
+			endTime = format(end, 'HH:mm');
+		} else if (initialStartTime) {
+			const end = addHours(initialStartTime, 1);
+			startDate = format(initialStartTime, 'yyyy-MM-dd');
+			startTime = format(initialStartTime, 'HH:mm');
+			endDate = format(end, 'yyyy-MM-dd');
+			endTime = format(end, 'HH:mm');
+		} else {
+			const now = new Date();
+			now.setMinutes(0, 0, 0);
+			const end = addHours(now, 1);
+			startDate = format(now, 'yyyy-MM-dd');
+			startTime = format(now, 'HH:mm');
+			endDate = format(end, 'yyyy-MM-dd');
+			endTime = format(end, 'HH:mm');
+		}
+	});
+
+	let submitting = $state(false);
+
+	function handleSubmit(e: Event) {
+		e.preventDefault();
+
+		if (!title.trim()) return;
+
+		const startDateTime = new Date(`${startDate}T${isAllDay ? '00:00' : startTime}`);
+		const endDateTime = new Date(`${endDate}T${isAllDay ? '23:59' : endTime}`);
+
+		const data: CreateEventInput | UpdateEventInput = {
+			title: title.trim(),
+			description: description.trim() || undefined,
+			location: location.trim() || undefined,
+			isAllDay,
+			startTime: startDateTime.toISOString(),
+			endTime: endDateTime.toISOString(),
+			calendarId,
+		};
+
+		submitting = true;
+		onSave(data);
+	}
+</script>
+
+<form onsubmit={handleSubmit}>
+	<div class="form-group">
+		<label for="title">Titel *</label>
+		<input
+			type="text"
+			id="title"
+			class="input"
+			bind:value={title}
+			placeholder="Terminname eingeben"
+			required
+		/>
+	</div>
+
+	<div class="form-group">
+		<label for="calendar">Kalender</label>
+		<select id="calendar" class="input" bind:value={calendarId}>
+			{#each calendarsStore.calendars as cal}
+				<option value={cal.id}>{cal.name}</option>
+			{/each}
+		</select>
+	</div>
+
+	<div class="form-group">
+		<label class="checkbox-label">
+			<input type="checkbox" bind:checked={isAllDay} />
+			Ganztägig
+		</label>
+	</div>
+
+	<div class="form-row">
+		<div class="form-group">
+			<label for="startDate">Beginn</label>
+			<input type="date" id="startDate" class="input" bind:value={startDate} required />
+		</div>
+		{#if !isAllDay}
+			<div class="form-group">
+				<label for="startTime">Uhrzeit</label>
+				<input type="time" id="startTime" class="input" bind:value={startTime} required />
+			</div>
+		{/if}
+	</div>
+
+	<div class="form-row">
+		<div class="form-group">
+			<label for="endDate">Ende</label>
+			<input type="date" id="endDate" class="input" bind:value={endDate} required />
+		</div>
+		{#if !isAllDay}
+			<div class="form-group">
+				<label for="endTime">Uhrzeit</label>
+				<input type="time" id="endTime" class="input" bind:value={endTime} required />
+			</div>
+		{/if}
+	</div>
+
+	<div class="form-group">
+		<label for="location">Ort</label>
+		<input
+			type="text"
+			id="location"
+			class="input"
+			bind:value={location}
+			placeholder="Ort hinzufügen"
+		/>
+	</div>
+
+	<div class="form-group">
+		<label for="description">Beschreibung</label>
+		<textarea
+			id="description"
+			class="input"
+			rows="3"
+			bind:value={description}
+			placeholder="Beschreibung hinzufügen"
+		></textarea>
+	</div>
+
+	<div class="form-actions">
+		<button type="button" class="btn btn-ghost" onclick={onCancel}>
+			Abbrechen
+		</button>
+		<button type="submit" class="btn btn-primary" disabled={submitting || !title.trim()}>
+			{mode === 'create' ? 'Erstellen' : 'Speichern'}
+		</button>
+	</div>
+</form>
+
+<style>
+	form {
+		display: flex;
+		flex-direction: column;
+		gap: 1rem;
+	}
+
+	.form-group {
+		display: flex;
+		flex-direction: column;
+		gap: 0.5rem;
+	}
+
+	.form-group label {
+		font-size: 0.875rem;
+		font-weight: 500;
+		color: hsl(var(--foreground));
+	}
+
+	.form-row {
+		display: flex;
+		gap: 1rem;
+	}
+
+	.form-row .form-group {
+		flex: 1;
+	}
+
+	.checkbox-label {
+		display: flex;
+		align-items: center;
+		gap: 0.5rem;
+		cursor: pointer;
+	}
+
+	.checkbox-label input {
+		width: 18px;
+		height: 18px;
+	}
+
+	textarea.input {
+		resize: vertical;
+		min-height: 80px;
+	}
+
+	.form-actions {
+		display: flex;
+		justify-content: flex-end;
+		gap: 0.75rem;
+		padding-top: 1rem;
+		border-top: 1px solid hsl(var(--border));
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/lib/i18n/index.ts b/apps/calendar/apps/web/src/lib/i18n/index.ts
new file mode 100644
index 000000000..00626549b
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/i18n/index.ts
@@ -0,0 +1,52 @@
+import { browser } from '$app/environment';
+import { init, register, locale, waitLocale } from 'svelte-i18n';
+
+// List of supported locales
+export const supportedLocales = ['de', 'en', 'it', 'fr', 'es'] as const;
+export type SupportedLocale = (typeof supportedLocales)[number];
+
+// Default locale
+const defaultLocale = 'de';
+
+// Register all available locales
+register('de', () => import('./locales/de.json'));
+register('en', () => import('./locales/en.json'));
+register('it', () => import('./locales/it.json'));
+register('fr', () => import('./locales/fr.json'));
+register('es', () => import('./locales/es.json'));
+
+// Get initial locale from browser or localStorage
+function getInitialLocale(): SupportedLocale {
+	if (browser) {
+		// Check localStorage first
+		const stored = localStorage.getItem('calendar_locale');
+		if (stored && supportedLocales.includes(stored as SupportedLocale)) {
+			return stored as SupportedLocale;
+		}
+
+		// Fall back to browser language
+		const browserLang = navigator.language.split('-')[0];
+		if (supportedLocales.includes(browserLang as SupportedLocale)) {
+			return browserLang as SupportedLocale;
+		}
+	}
+
+	return defaultLocale;
+}
+
+// Initialize i18n at module scope (required for SSR)
+init({
+	fallbackLocale: defaultLocale,
+	initialLocale: getInitialLocale(),
+});
+
+// Set locale and persist to localStorage
+export function setLocale(newLocale: SupportedLocale) {
+	locale.set(newLocale);
+	if (browser) {
+		localStorage.setItem('calendar_locale', newLocale);
+	}
+}
+
+// Wait for locale to be loaded (useful for SSR)
+export { waitLocale };
diff --git a/apps/calendar/apps/web/src/lib/i18n/locales/de.json b/apps/calendar/apps/web/src/lib/i18n/locales/de.json
new file mode 100644
index 000000000..47c19b6f9
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/i18n/locales/de.json
@@ -0,0 +1,86 @@
+{
+	"app": {
+		"name": "Kalender",
+		"loading": "Laden..."
+	},
+	"nav": {
+		"calendar": "Kalender",
+		"calendars": "Kalender",
+		"agenda": "Agenda",
+		"settings": "Einstellungen",
+		"feedback": "Feedback"
+	},
+	"views": {
+		"day": "Tag",
+		"week": "Woche",
+		"month": "Monat",
+		"year": "Jahr",
+		"agenda": "Agenda"
+	},
+	"calendar": {
+		"today": "Heute",
+		"newEvent": "Neuer Termin",
+		"noEvents": "Keine Termine",
+		"allDay": "Ganztägig",
+		"myCalendars": "Meine Kalender",
+		"sharedCalendars": "Geteilte Kalender"
+	},
+	"event": {
+		"title": "Titel",
+		"description": "Beschreibung",
+		"location": "Ort",
+		"start": "Beginn",
+		"end": "Ende",
+		"allDay": "Ganztägig",
+		"repeat": "Wiederholen",
+		"reminder": "Erinnerung",
+		"calendar": "Kalender",
+		"save": "Speichern",
+		"delete": "Löschen",
+		"cancel": "Abbrechen"
+	},
+	"repeat": {
+		"none": "Nicht wiederholen",
+		"daily": "Täglich",
+		"weekly": "Wöchentlich",
+		"monthly": "Monatlich",
+		"yearly": "Jährlich"
+	},
+	"reminder": {
+		"atTime": "Zum Zeitpunkt",
+		"5min": "5 Minuten vorher",
+		"15min": "15 Minuten vorher",
+		"30min": "30 Minuten vorher",
+		"1hour": "1 Stunde vorher",
+		"1day": "1 Tag vorher"
+	},
+	"share": {
+		"share": "Teilen",
+		"shareCalendar": "Kalender teilen",
+		"permissions": "Berechtigungen",
+		"read": "Nur lesen",
+		"write": "Lesen & Schreiben",
+		"admin": "Administrator",
+		"pending": "Ausstehend",
+		"accepted": "Akzeptiert"
+	},
+	"auth": {
+		"login": "Anmelden",
+		"logout": "Abmelden",
+		"register": "Registrieren",
+		"email": "E-Mail",
+		"password": "Passwort",
+		"forgotPassword": "Passwort vergessen?"
+	},
+	"common": {
+		"save": "Speichern",
+		"cancel": "Abbrechen",
+		"delete": "Löschen",
+		"edit": "Bearbeiten",
+		"add": "Hinzufügen",
+		"close": "Schließen",
+		"search": "Suchen",
+		"error": "Fehler",
+		"success": "Erfolgreich"
+	}
+}
diff --git a/apps/calendar/apps/web/src/lib/i18n/locales/en.json b/apps/calendar/apps/web/src/lib/i18n/locales/en.json
new file mode 100644
index 000000000..a7c60f9b1
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/i18n/locales/en.json
@@ -0,0 +1,86 @@
+{
+	"app": {
+		"name": "Calendar",
+		"loading": "Loading..."
+	},
+	"nav": {
+		"calendar": "Calendar",
+		"calendars": "Calendars",
+		"agenda": "Agenda",
+		"settings": "Settings",
+		"feedback": "Feedback"
+	},
+	"views": {
+		"day": "Day",
+		"week": "Week",
+		"month": "Month",
+		"year": "Year",
+		"agenda": "Agenda"
+	},
+	"calendar": {
+		"today": "Today",
+		"newEvent": "New Event",
+		"noEvents": "No events",
+		"allDay": "All day",
+		"myCalendars": "My Calendars",
+		"sharedCalendars": "Shared Calendars"
+	},
+	"event": {
+		"title": "Title",
+		"description": "Description",
+		"location": "Location",
+		"start": "Start",
+		"end": "End",
+		"allDay": "All day",
+		"repeat": "Repeat",
+		"reminder": "Reminder",
+		"calendar": "Calendar",
+		"save": "Save",
+		"delete": "Delete",
+		"cancel": "Cancel"
+	},
+	"repeat": {
+		"none": "Don't repeat",
+		"daily": "Daily",
+		"weekly": "Weekly",
+		"monthly": "Monthly",
+		"yearly": "Yearly"
+	},
+	"reminder": {
+		"atTime": "At time of event",
+		"5min": "5 minutes before",
+		"15min": "15 minutes before",
+		"30min": "30 minutes before",
+		"1hour": "1 hour before",
+		"1day": "1 day before"
+	},
+	"share": {
+		"share": "Share",
+		"shareCalendar": "Share calendar",
+		"permissions": "Permissions",
+		"read": "View only",
+		"write": "Can edit",
+		"admin": "Admin",
+		"pending": "Pending",
+		"accepted": "Accepted"
+	},
+	"auth": {
+		"login": "Login",
+		"logout": "Logout",
+		"register": "Register",
+		"email": "Email",
+		"password": "Password",
+		"forgotPassword": "Forgot password?"
+	},
+	"common": {
+		"save": "Save",
+		"cancel": "Cancel",
+		"delete": "Delete",
+		"edit": "Edit",
+		"add": "Add",
+		"close": "Close",
+		"search": "Search",
+		"error": "Error",
+		"success": "Success"
+	}
+}
diff --git a/apps/calendar/apps/web/src/lib/i18n/locales/es.json b/apps/calendar/apps/web/src/lib/i18n/locales/es.json
new file mode 100644
index 000000000..ef346bdc3
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/i18n/locales/es.json
@@ -0,0 +1,86 @@
+{
+	"app": {
+		"name": "Calendario",
+		"loading": "Cargando..."
+	},
+	"nav": {
+		"calendar": "Calendario",
+		"calendars": "Calendarios",
+		"agenda": "Agenda",
+		"settings": "Configuración",
+		"feedback": "Comentarios"
+	},
+	"views": {
+		"day": "Día",
+		"week": "Semana",
+		"month": "Mes",
+		"year": "Año",
+		"agenda": "Agenda"
+	},
+	"calendar": {
+		"today": "Hoy",
+		"newEvent": "Nuevo evento",
+		"noEvents": "Sin eventos",
+		"allDay": "Todo el día",
+		"myCalendars": "Mis calendarios",
+		"sharedCalendars": "Calendarios compartidos"
+	},
+	"event": {
+		"title": "Título",
+		"description": "Descripción",
+		"location": "Ubicación",
+		"start": "Inicio",
+		"end": "Fin",
+		"allDay": "Todo el día",
+		"repeat": "Repetir",
+		"reminder": "Recordatorio",
+		"calendar": "Calendario",
+		"save": "Guardar",
+		"delete": "Eliminar",
+		"cancel": "Cancelar"
+	},
+	"repeat": {
+		"none": "No repetir",
+		"daily": "Diario",
+		"weekly": "Semanal",
+		"monthly": "Mensual",
+		"yearly": "Anual"
+	},
+	"reminder": {
+		"atTime": "Al momento del evento",
+		"5min": "5 minutos antes",
+		"15min": "15 minutos antes",
+		"30min": "30 minutos antes",
+		"1hour": "1 hora antes",
+		"1day": "1 día antes"
+	},
+	"share": {
+		"share": "Compartir",
+		"shareCalendar": "Compartir calendario",
+		"permissions": "Permisos",
+		"read": "Solo lectura",
+		"write": "Puede editar",
+		"admin": "Administrador",
+		"pending": "Pendiente",
+		"accepted": "Aceptado"
+	},
+	"auth": {
+		"login": "Iniciar sesión",
+		"logout": "Cerrar sesión",
+		"register": "Registrarse",
+		"email": "Correo electrónico",
+		"password": "Contraseña",
+		"forgotPassword": "¿Olvidaste tu contraseña?"
+	},
+	"common": {
+		"save": "Guardar",
+		"cancel": "Cancelar",
+		"delete": "Eliminar",
+		"edit": "Editar",
+		"add": "Agregar",
+		"close": "Cerrar",
+		"search": "Buscar",
+		"error": "Error",
+		"success": "Éxito"
+	}
+}
diff --git a/apps/calendar/apps/web/src/lib/i18n/locales/fr.json b/apps/calendar/apps/web/src/lib/i18n/locales/fr.json
new file mode 100644
index 000000000..8d66c96e7
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/i18n/locales/fr.json
@@ -0,0 +1,86 @@
+{
+	"app": {
+		"name": "Calendrier",
+		"loading": "Chargement..."
+	},
+	"nav": {
+		"calendar": "Calendrier",
+		"calendars": "Calendriers",
+		"agenda": "Agenda",
+		"settings": "Paramètres",
+		"feedback": "Commentaires"
+	},
+	"views": {
+		"day": "Jour",
+		"week": "Semaine",
+		"month": "Mois",
+		"year": "Année",
+		"agenda": "Agenda"
+	},
+	"calendar": {
+		"today": "Aujourd'hui",
+		"newEvent": "Nouvel événement",
+		"noEvents": "Aucun événement",
+		"allDay": "Toute la journée",
+		"myCalendars": "Mes calendriers",
+		"sharedCalendars": "Calendriers partagés"
+	},
+	"event": {
+		"title": "Titre",
+		"description": "Description",
+		"location": "Lieu",
+		"start": "Début",
+		"end": "Fin",
+		"allDay": "Toute la journée",
+		"repeat": "Répéter",
+		"reminder": "Rappel",
+		"calendar": "Calendrier",
+		"save": "Enregistrer",
+		"delete": "Supprimer",
+		"cancel": "Annuler"
+	},
+	"repeat": {
+		"none": "Ne pas répéter",
+		"daily": "Quotidien",
+		"weekly": "Hebdomadaire",
+		"monthly": "Mensuel",
+		"yearly": "Annuel"
+	},
+	"reminder": {
+		"atTime": "Au moment de l'événement",
+		"5min": "5 minutes avant",
+		"15min": "15 minutes avant",
+		"30min": "30 minutes avant",
+		"1hour": "1 heure avant",
+		"1day": "1 jour avant"
+	},
+	"share": {
+		"share": "Partager",
+		"shareCalendar": "Partager le calendrier",
+		"permissions": "Autorisations",
+		"read": "Lecture seule",
+		"write": "Modification",
+		"admin": "Administrateur",
+		"pending": "En attente",
+		"accepted": "Accepté"
+	},
+	"auth": {
+		"login": "Connexion",
+		"logout": "Déconnexion",
+		"register": "Inscription",
+		"email": "E-mail",
+		"password": "Mot de passe",
+		"forgotPassword": "Mot de passe oublié?"
+	},
+	"common": {
+		"save": "Enregistrer",
+		"cancel": "Annuler",
+		"delete": "Supprimer",
+		"edit": "Modifier",
+		"add": "Ajouter",
+		"close": "Fermer",
+		"search": "Rechercher",
+		"error": "Erreur",
+		"success": "Succès"
+	}
+}
diff --git a/apps/calendar/apps/web/src/lib/i18n/locales/it.json b/apps/calendar/apps/web/src/lib/i18n/locales/it.json
new file mode 100644
index 000000000..946363329
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/i18n/locales/it.json
@@ -0,0 +1,86 @@
+{
+	"app": {
+		"name": "Calendario",
+		"loading": "Caricamento..."
+	},
+	"nav": {
+		"calendar": "Calendario",
+		"calendars": "Calendari",
+		"agenda": "Agenda",
+		"settings": "Impostazioni",
+		"feedback": "Feedback"
+	},
+	"views": {
+		"day": "Giorno",
+		"week": "Settimana",
+		"month": "Mese",
+		"year": "Anno",
+		"agenda": "Agenda"
+	},
+	"calendar": {
+		"today": "Oggi",
+		"newEvent": "Nuovo evento",
+		"noEvents": "Nessun evento",
+		"allDay": "Tutto il giorno",
+		"myCalendars": "I miei calendari",
+		"sharedCalendars": "Calendari condivisi"
+	},
+	"event": {
+		"title": "Titolo",
+		"description": "Descrizione",
+		"location": "Luogo",
+		"start": "Inizio",
+		"end": "Fine",
+		"allDay": "Tutto il giorno",
+		"repeat": "Ripeti",
+		"reminder": "Promemoria",
+		"calendar": "Calendario",
+		"save": "Salva",
+		"delete": "Elimina",
+		"cancel": "Annulla"
+	},
+	"repeat": {
+		"none": "Non ripetere",
+		"daily": "Giornaliero",
+		"weekly": "Settimanale",
+		"monthly": "Mensile",
+		"yearly": "Annuale"
+	},
+	"reminder": {
+		"atTime": "All'ora dell'evento",
+		"5min": "5 minuti prima",
+		"15min": "15 minuti prima",
+		"30min": "30 minuti prima",
+		"1hour": "1 ora prima",
+		"1day": "1 giorno prima"
+	},
+	"share": {
+		"share": "Condividi",
+		"shareCalendar": "Condividi calendario",
+		"permissions": "Autorizzazioni",
+		"read": "Solo lettura",
+		"write": "Può modificare",
+		"admin": "Amministratore",
+		"pending": "In attesa",
+		"accepted": "Accettato"
+	},
+	"auth": {
+		"login": "Accedi",
+		"logout": "Esci",
+		"register": "Registrati",
+		"email": "Email",
+		"password": "Password",
+		"forgotPassword": "Password dimenticata?"
+	},
+	"common": {
+		"save": "Salva",
+		"cancel": "Annulla",
+		"delete": "Elimina",
+		"edit": "Modifica",
+		"add": "Aggiungi",
+		"close": "Chiudi",
+		"search": "Cerca",
+		"error": "Errore",
+		"success": "Successo"
+	}
+}
diff --git a/apps/calendar/apps/web/src/lib/stores/auth.svelte.ts b/apps/calendar/apps/web/src/lib/stores/auth.svelte.ts
new file mode 100644
index 000000000..555153459
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/stores/auth.svelte.ts
@@ -0,0 +1,185 @@
+/**
+ * Auth Store - Manages authentication state using Svelte 5 runes
+ * Uses Mana Core Auth
+ */
+
+import { browser } from '$app/environment';
+import { initializeWebAuth, type UserData } from '@manacore/shared-auth';
+
+// Initialize Mana Core Auth only on the client side
+const MANA_AUTH_URL = 'http://localhost:3001';
+
+// Lazy initialization to avoid SSR issues with localStorage
+let _authService: ReturnType<typeof initializeWebAuth>['authService'] | null = null;
+let _tokenManager: ReturnType<typeof initializeWebAuth>['tokenManager'] | null = null;
+
+function getAuthService() {
+	if (!browser) return null;
+	if (!_authService) {
+		const auth = initializeWebAuth({ baseUrl: MANA_AUTH_URL });
+		_authService = auth.authService;
+		_tokenManager = auth.tokenManager;
+	}
+	return _authService;
+}
+
+// State
+let user = $state<UserData | null>(null);
+let loading = $state(true);
+let initialized = $state(false);
+
+export const authStore = {
+	// Getters
+	get user() {
+		return user;
+	},
+	get loading() {
+		return loading;
+	},
+	get isAuthenticated() {
+		return !!user;
+	},
+	get initialized() {
+		return initialized;
+	},
+
+	/**
+	 * Initialize auth state from stored tokens
+	 */
+	async initialize() {
+		if (initialized) return;
+
+		const authService = getAuthService();
+		if (!authService) {
+			initialized = true;
+			loading = false;
+			return;
+		}
+
+		loading = true;
+		try {
+			const authenticated = await authService.isAuthenticated();
+			if (authenticated) {
+				const userData = await authService.getUserFromToken();
+				user = userData;
+			}
+			initialized = true;
+		} catch (error) {
+			console.error('Failed to initialize auth:', error);
+			user = null;
+		} finally {
+			loading = false;
+		}
+	},
+
+	/**
+	 * Sign in with email and password
+	 */
+	async signIn(email: string, password: string) {
+		const authService = getAuthService();
+		if (!authService) {
+			return { success: false, error: 'Auth not available on server' };
+		}
+
+		try {
+			const result = await authService.signIn(email, password);
+
+			if (!result.success) {
+				return { success: false, error: result.error || 'Login failed' };
+			}
+
+			// Get user data from token
+			const userData = await authService.getUserFromToken();
+			user = userData;
+
+			return { success: true };
+		} catch (error) {
+			const errorMessage = error instanceof Error ? error.message : 'Unknown error';
+			return { success: false, error: errorMessage };
+		}
+	},
+
+	/**
+	 * Sign up with email and password
+	 */
+	async signUp(email: string, password: string) {
+		const authService = getAuthService();
+		if (!authService) {
+			return { success: false, error: 'Auth not available on server', needsVerification: false };
+		}
+
+		try {
+			const result = await authService.signUp(email, password);
+
+			if (!result.success) {
+				return { success: false, error: result.error || 'Signup failed', needsVerification: false };
+			}
+
+			// Mana Core Auth requires separate login after signup
+			if (result.needsVerification) {
+				return { success: true, needsVerification: true };
+			}
+
+			// Auto sign in after successful signup
+			const signInResult = await this.signIn(email, password);
+			return { ...signInResult, needsVerification: false };
+		} catch (error) {
+			const errorMessage = error instanceof Error ? error.message : 'Unknown error';
+			return { success: false, error: errorMessage, needsVerification: false };
+		}
+	},
+
+	/**
+	 * Sign out
+	 */
+	async signOut() {
+		const authService = getAuthService();
+		if (!authService) {
+			user = null;
+			return;
+		}
+
+		try {
+			await authService.signOut();
+			user = null;
+		} catch (error) {
+			console.error('Sign out error:', error);
+			// Clear user even if sign out fails
+			user = null;
+		}
+	},
+
+	/**
+	 * Send password reset email
+	 */
+	async resetPassword(email: string) {
+		const authService = getAuthService();
+		if (!authService) {
+			return { success: false, error: 'Auth not available on server' };
+		}
+
+		try {
+			const result = await authService.forgotPassword(email);
+
+			if (!result.success) {
+				return { success: false, error: result.error || 'Password reset failed' };
+			}
+
+			return { success: true };
+		} catch (error) {
+			const errorMessage = error instanceof Error ? error.message : 'Unknown error';
+			return { success: false, error: errorMessage };
+		}
+	},
+
+	/**
+	 * Get access token for API calls
+	 */
+	async getAccessToken() {
+		const authService = getAuthService();
+		if (!authService) {
+			return null;
+		}
+		return await authService.getAppToken();
+	},
+};
diff --git a/apps/calendar/apps/web/src/lib/stores/calendars.svelte.ts b/apps/calendar/apps/web/src/lib/stores/calendars.svelte.ts
new file mode 100644
index 000000000..ec838f310
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/stores/calendars.svelte.ts
@@ -0,0 +1,120 @@
+/**
+ * Calendars Store - Manages user calendars using Svelte 5 runes
+ */
+
+import type { Calendar, CreateCalendarInput, UpdateCalendarInput } from '@calendar/shared';
+import * as api from '$lib/api/calendars';
+
+// State
+let calendars = $state<Calendar[]>([]);
+let loading = $state(false);
+let error = $state<string | null>(null);
+
+// Derived: visible calendars
+const visibleCalendars = $derived(calendars.filter((c) => c.isVisible));
+
+// Derived: default calendar
+const defaultCalendar = $derived(calendars.find((c) => c.isDefault) || calendars[0]);
+
+export const calendarsStore = {
+	// Getters
+	get calendars() {
+		return calendars;
+	},
+	get visibleCalendars() {
+		return visibleCalendars;
+	},
+	get defaultCalendar() {
+		return defaultCalendar;
+	},
+	get loading() {
+		return loading;
+	},
+	get error() {
+		return error;
+	},
+
+	/**
+	 * Fetch all calendars
+	 */
+	async fetchCalendars() {
+		loading = true;
+		error = null;
+
+		const result = await api.getCalendars();
+
+		if (result.error) {
+			error = result.error.message;
+			calendars = [];
+		} else {
+			calendars = result.data || [];
+		}
+
+		loading = false;
+		return result;
+	},
+
+	/**
+	 * Create a new calendar
+	 */
+	async createCalendar(data: CreateCalendarInput) {
+		const result = await api.createCalendar(data);
+
+		if (result.data) {
+			calendars = [...calendars, result.data];
+		}
+
+		return result;
+	},
+
+	/**
+	 * Update a calendar
+	 */
+	async updateCalendar(id: string, data: UpdateCalendarInput) {
+		const result = await api.updateCalendar(id, data);
+
+		if (result.data) {
+			calendars = calendars.map((c) => (c.id === id ? result.data! : c));
+		}
+
+		return result;
+	},
+
+	/**
+	 * Delete a calendar
+	 */
+	async deleteCalendar(id: string) {
+		const result = await api.deleteCalendar(id);
+
+		if (!result.error) {
+			calendars = calendars.filter((c) => c.id !== id);
+		}
+
+		return result;
+	},
+
+	/**
+	 * Toggle calendar visibility
+	 */
+	async toggleVisibility(id: string) {
+		const calendar = calendars.find((c) => c.id === id);
+		if (!calendar) return;
+
+		return this.updateCalendar(id, { isVisible: !calendar.isVisible });
+	},
+
+	/**
+	 * Get calendar by ID
+	 */
+	getById(id: string) {
+		return calendars.find((c) => c.id === id);
+	},
+
+	/**
+	 * Get calendar color by ID (with fallback)
+	 */
+	getColor(id: string) {
+		const calendar = calendars.find((c) => c.id === id);
+		return calendar?.color || '#3b82f6';
+	},
+};
diff --git a/apps/calendar/apps/web/src/lib/stores/events.svelte.ts b/apps/calendar/apps/web/src/lib/stores/events.svelte.ts
new file mode 100644
index 000000000..4ce574c2d
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/stores/events.svelte.ts
@@ -0,0 +1,135 @@
+/**
+ * Events Store - Manages calendar events using Svelte 5 runes
+ */
+
+import type { CalendarEvent, CreateEventInput, UpdateEventInput } from '@calendar/shared';
+import * as api from '$lib/api/events';
+import { format, isWithinInterval, parseISO, isSameDay } from 'date-fns';
+
+// State
+let events = $state<CalendarEvent[]>([]);
+let loading = $state(false);
+let error = $state<string | null>(null);
+let loadedRange = $state<{ start: Date; end: Date } | null>(null);
+
+export const eventsStore = {
+	// Getters
+	get events() {
+		return events;
+	},
+	get loading() {
+		return loading;
+	},
+	get error() {
+		return error;
+	},
+
+	/**
+	 * Fetch events for a date range
+	 */
+	async fetchEvents(startDate: Date, endDate: Date, calendarIds?: string[]) {
+		loading = true;
+		error = null;
+
+		const result = await api.getEvents({
+			startDate: format(startDate, "yyyy-MM-dd'T'HH:mm:ss"),
+			endDate: format(endDate, "yyyy-MM-dd'T'HH:mm:ss"),
+			calendarIds,
+		});
+
+		if (result.error) {
+			error = result.error.message;
+		} else {
+			events = result.data || [];
+			loadedRange = { start: startDate, end: endDate };
+		}
+
+		loading = false;
+		return result;
+	},
+
+	/**
+	 * Get events for a specific day
+	 */
+	getEventsForDay(date: Date) {
+		return events.filter((event) => {
+			const eventStart = typeof event.startTime === 'string' ? parseISO(event.startTime) : event.startTime;
+			const eventEnd = typeof event.endTime === 'string' ? parseISO(event.endTime) : event.endTime;
+
+			// For all-day events, check if day falls within event range
+			if (event.isAllDay) {
+				return isWithinInterval(date, { start: eventStart, end: eventEnd }) || isSameDay(date, eventStart);
+			}
+
+			// For timed events, check if event starts on this day
+			return isSameDay(date, eventStart);
+		});
+	},
+
+	/**
+	 * Get events within a time range
+	 */
+	getEventsInRange(start: Date, end: Date) {
+		return events.filter((event) => {
+			const eventStart = typeof event.startTime === 'string' ? parseISO(event.startTime) : event.startTime;
+			const eventEnd = typeof event.endTime === 'string' ? parseISO(event.endTime) : event.endTime;
+
+			// Check if event overlaps with the range
+			return eventStart <= end && eventEnd >= start;
+		});
+	},
+
+	/**
+	 * Create a new event
+	 */
+	async createEvent(data: CreateEventInput) {
+		const result = await api.createEvent(data);
+
+		if (result.data) {
+			events = [...events, result.data];
+		}
+
+		return result;
+	},
+
+	/**
+	 * Update an event
+	 */
+	async updateEvent(id: string, data: UpdateEventInput) {
+		const result = await api.updateEvent(id, data);
+
+		if (result.data) {
+			events = events.map((e) => (e.id === id ? result.data! : e));
+		}
+
+		return result;
+	},
+
+	/**
+	 * Delete an event
+	 */
+	async deleteEvent(id: string) {
+		const result = await api.deleteEvent(id);
+
+		if (!result.error) {
+			events = events.filter((e) => e.id !== id);
+		}
+
+		return result;
+	},
+
+	/**
+	 * Get event by ID
+	 */
+	getById(id: string) {
+		return events.find((e) => e.id === id);
+	},
+
+	/**
+	 * Clear events cache
+	 */
+	clear() {
+		events = [];
+		loadedRange = null;
+	},
+};
diff --git a/apps/calendar/apps/web/src/lib/stores/navigation.ts b/apps/calendar/apps/web/src/lib/stores/navigation.ts
new file mode 100644
index 000000000..f4072e926
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/stores/navigation.ts
@@ -0,0 +1,4 @@
+import { writable } from 'svelte/store';
+
+export const isSidebarMode = writable(false);
+export const isNavCollapsed = writable(false);
diff --git a/apps/calendar/apps/web/src/lib/stores/theme.ts b/apps/calendar/apps/web/src/lib/stores/theme.ts
new file mode 100644
index 000000000..6abdb5d52
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/stores/theme.ts
@@ -0,0 +1,7 @@
+import { createThemeStore } from '@manacore/shared-theme';
+
+// Create theme store with Calendar's primary color (blue)
+export const theme = createThemeStore({
+	appId: 'calendar',
+	defaultVariant: 'ocean',
+});
diff --git a/apps/calendar/apps/web/src/lib/stores/toast.ts b/apps/calendar/apps/web/src/lib/stores/toast.ts
new file mode 100644
index 000000000..0655b3212
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/stores/toast.ts
@@ -0,0 +1,50 @@
+import { writable } from 'svelte/store';
+
+export type ToastType = 'success' | 'error' | 'warning' | 'info';
+
+export interface Toast {
+	id: string;
+	type: ToastType;
+	message: string;
+	duration?: number;
+}
+
+function createToastStore() {
+	const { subscribe, update } = writable<Toast[]>([]);
+
+	function add(message: string, type: ToastType = 'info', duration: number = 4000) {
+		const id = crypto.randomUUID();
+		const toast: Toast = { id, type, message, duration };
+
+		update((toasts) => [...toasts, toast]);
+
+		if (duration > 0) {
+			setTimeout(() => {
+				remove(id);
+			}, duration);
+		}
+
+		return id;
+	}
+
+	function remove(id: string) {
+		update((toasts) => toasts.filter((t) => t.id !== id));
+	}
+
+	function clear() {
+		update(() => []);
+	}
+
+	return {
+		subscribe,
+		add,
+		remove,
+		clear,
+		success: (message: string, duration?: number) => add(message, 'success', duration),
+		error: (message: string, duration?: number) => add(message, 'error', duration),
+		warning: (message: string, duration?: number) => add(message, 'warning', duration),
+		info: (message: string, duration?: number) => add(message, 'info', duration),
+	};
+}
+
+export const toast = createToastStore();
diff --git a/apps/calendar/apps/web/src/lib/stores/view.svelte.ts b/apps/calendar/apps/web/src/lib/stores/view.svelte.ts
new file mode 100644
index 000000000..41d8838c0
--- /dev/null
+++ b/apps/calendar/apps/web/src/lib/stores/view.svelte.ts
@@ -0,0 +1,158 @@
+/**
+ * View Store - Manages calendar view state using Svelte 5 runes
+ */
+
+import { browser } from '$app/environment';
+import type { CalendarViewType } from '@calendar/shared';
+import {
+	startOfDay,
+	startOfWeek,
+	startOfMonth,
+	endOfDay,
+	endOfWeek,
+	endOfMonth,
+	addDays,
+	addWeeks,
+	addMonths,
+	addYears,
+	subDays,
+	subWeeks,
+	subMonths,
+	subYears,
+} from 'date-fns';
+
+// State
+let currentDate = $state(new Date());
+let viewType = $state<CalendarViewType>('week');
+
+// Derived state
+const viewRange = $derived.by(() => {
+	switch (viewType) {
+		case 'day':
+			return {
+				start: startOfDay(currentDate),
+				end: endOfDay(currentDate),
+			};
+		case 'week':
+			return {
+				start: startOfWeek(currentDate, { weekStartsOn: 1 }),
+				end: endOfWeek(currentDate, { weekStartsOn: 1 }),
+			};
+		case 'month':
+			return {
+				start: startOfMonth(currentDate),
+				end: endOfMonth(currentDate),
+			};
+		case 'year':
+			return {
+				start: new Date(currentDate.getFullYear(), 0, 1),
+				end: new Date(currentDate.getFullYear(), 11, 31),
+			};
+		case 'agenda':
+			// Agenda shows 30 days from current date
+			return {
+				start: startOfDay(currentDate),
+				end: endOfDay(addDays(currentDate, 30)),
+			};
+		default:
+			return {
+				start: startOfWeek(currentDate, { weekStartsOn: 1 }),
+				end: endOfWeek(currentDate, { weekStartsOn: 1 }),
+			};
+	}
+});
+
+export const viewStore = {
+	// Getters
+	get currentDate() {
+		return currentDate;
+	},
+	get viewType() {
+		return viewType;
+	},
+	get viewRange() {
+		return viewRange;
+	},
+
+	/**
+	 * Initialize view state from localStorage
+	 */
+	initialize() {
+		if (!browser) return;
+
+		const savedView = localStorage.getItem('calendar-view-type');
+		if (savedView && ['day', 'week', 'month', 'year', 'agenda'].includes(savedView)) {
+			viewType = savedView as CalendarViewType;
+		}
+	},
+
+	/**
+	 * Set the current date
+	 */
+	setDate(date: Date) {
+		currentDate = date;
+	},
+
+	/**
+	 * Set the view type
+	 */
+	setViewType(type: CalendarViewType) {
+		viewType = type;
+		if (browser) {
+			localStorage.setItem('calendar-view-type', type);
+		}
+	},
+
+	/**
+	 * Navigate to today
+	 */
+	goToToday() {
+		currentDate = new Date();
+	},
+
+	/**
+	 * Navigate to previous period
+	 */
+	goToPrevious() {
+		switch (viewType) {
+			case 'day':
+				currentDate = subDays(currentDate, 1);
+				break;
+			case 'week':
+				currentDate = subWeeks(currentDate, 1);
+				break;
+			case 'month':
+				currentDate = subMonths(currentDate, 1);
+				break;
+			case 'year':
+				currentDate = subYears(currentDate, 1);
+				break;
+			case 'agenda':
+				currentDate = subDays(currentDate, 7);
+				break;
+		}
+	},
+
+	/**
+	 * Navigate to next period
+	 */
+	goToNext() {
+		switch (viewType) {
+			case 'day':
+				currentDate = addDays(currentDate, 1);
+				break;
+			case 'week':
+				currentDate = addWeeks(currentDate, 1);
+				break;
+			case 'month':
+				currentDate = addMonths(currentDate, 1);
+				break;
+			case 'year':
+				currentDate = addYears(currentDate, 1);
+				break;
+			case 'agenda':
+				currentDate = addDays(currentDate, 7);
+				break;
+		}
+	},
+};
diff --git a/apps/calendar/apps/web/src/routes/(auth)/forgot-password/+page.svelte b/apps/calendar/apps/web/src/routes/(auth)/forgot-password/+page.svelte
new file mode 100644
index 000000000..de8af9b32
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/(auth)/forgot-password/+page.svelte
@@ -0,0 +1,27 @@
+<script lang="ts">
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { toast } from '$lib/stores/toast';
+	import { ForgotPasswordPage } from '@manacore/shared-auth-ui';
+
+	async function handleResetPassword(email: string) {
+		const result = await authStore.resetPassword(email);
+
+		if (!result.success) {
+			toast.error(result.error || 'Anfrage fehlgeschlagen');
+			return { success: false, error: result.error };
+		}
+
+		toast.success('E-Mail gesendet. Bitte überprüfen Sie Ihren Posteingang.');
+		return { success: true };
+	}
+</script>
+
+<svelte:head>
+	<title>Passwort vergessen | Kalender</title>
+</svelte:head>
+
+<ForgotPasswordPage
+	onResetPassword={handleResetPassword}
+	loginUrl="/login"
+	appName="Kalender"
+/>
diff --git a/apps/calendar/apps/web/src/routes/(auth)/login/+page.svelte b/apps/calendar/apps/web/src/routes/(auth)/login/+page.svelte
new file mode 100644
index 000000000..c2ea8dc65
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/(auth)/login/+page.svelte
@@ -0,0 +1,30 @@
+<script lang="ts">
+	import { goto } from '$app/navigation';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { toast } from '$lib/stores/toast';
+	import { LoginPage } from '@manacore/shared-auth-ui';
+
+	async function handleLogin(email: string, password: string) {
+		const result = await authStore.signIn(email, password);
+
+		if (!result.success) {
+			toast.error(result.error || 'Anmeldung fehlgeschlagen');
+			return { success: false, error: result.error };
+		}
+
+		toast.success('Erfolgreich angemeldet');
+		goto('/');
+		return { success: true };
+	}
+</script>
+
+<svelte:head>
+	<title>Anmelden | Kalender</title>
+</svelte:head>
+
+<LoginPage
+	onLogin={handleLogin}
+	registerUrl="/register"
+	forgotPasswordUrl="/forgot-password"
+	appName="Kalender"
+/>
diff --git a/apps/calendar/apps/web/src/routes/(auth)/register/+page.svelte b/apps/calendar/apps/web/src/routes/(auth)/register/+page.svelte
new file mode 100644
index 000000000..a9174a19e
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/(auth)/register/+page.svelte
@@ -0,0 +1,35 @@
+<script lang="ts">
+	import { goto } from '$app/navigation';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { toast } from '$lib/stores/toast';
+	import { RegisterPage } from '@manacore/shared-auth-ui';
+
+	async function handleRegister(email: string, password: string) {
+		const result = await authStore.signUp(email, password);
+
+		if (!result.success) {
+			toast.error(result.error || 'Registrierung fehlgeschlagen');
+			return { success: false, error: result.error };
+		}
+
+		if (result.needsVerification) {
+			toast.info('Bitte bestätigen Sie Ihre E-Mail-Adresse');
+			goto('/login');
+			return { success: true, needsVerification: true };
+		}
+
+		toast.success('Erfolgreich registriert');
+		goto('/');
+		return { success: true };
+	}
+</script>
+
+<svelte:head>
+	<title>Registrieren | Kalender</title>
+</svelte:head>
+
+<RegisterPage
+	onRegister={handleRegister}
+	loginUrl="/login"
+	appName="Kalender"
+/>
diff --git a/apps/calendar/apps/web/src/routes/+layout.svelte b/apps/calendar/apps/web/src/routes/+layout.svelte
new file mode 100644
index 000000000..cb6e65a67
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/+layout.svelte
@@ -0,0 +1,265 @@
+<script lang="ts">
+	import { goto } from '$app/navigation';
+	import { page } from '$app/stores';
+	import { onMount } from 'svelte';
+	import { locale } from 'svelte-i18n';
+	import { PillNavigation } from '@manacore/shared-ui';
+	import type { PillNavItem, PillDropdownItem } from '@manacore/shared-ui';
+	import { theme } from '$lib/stores/theme';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { viewStore } from '$lib/stores/view.svelte';
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import { THEME_DEFINITIONS } from '@manacore/shared-theme';
+	import {
+		isSidebarMode as sidebarModeStore,
+		isNavCollapsed as collapsedStore,
+	} from '$lib/stores/navigation';
+	import { getLanguageDropdownItems, getCurrentLanguageLabel } from '@manacore/shared-i18n';
+	import { getPillAppItems } from '@manacore/shared-branding';
+	import { setLocale, supportedLocales } from '$lib/i18n';
+	import ToastContainer from '$lib/components/ToastContainer.svelte';
+	import '../app.css';
+
+	// App switcher items
+	const appItems = getPillAppItems('calendar');
+
+	let { children } = $props();
+
+	let loading = $state(true);
+	let isSidebarMode = $state(false);
+	let isCollapsed = $state(false);
+
+	// Use theme store's isDark directly
+	let isDark = $derived(theme.isDark);
+
+	// Theme variant dropdown items
+	let themeVariantItems = $derived<PillDropdownItem[]>([
+		...theme.variants.map((variant) => ({
+			id: variant,
+			label: THEME_DEFINITIONS[variant].label,
+			icon: THEME_DEFINITIONS[variant].icon,
+			onClick: () => theme.setVariant(variant),
+			active: theme.variant === variant,
+		})),
+		{
+			id: 'all-themes',
+			label: 'Alle Themes',
+			icon: 'palette',
+			onClick: () => goto('/themes'),
+			active: false,
+		},
+	]);
+
+	// Current theme variant label
+	let currentThemeVariantLabel = $derived(THEME_DEFINITIONS[theme.variant].label);
+
+	// Language selector items
+	let currentLocale = $derived($locale || 'de');
+	function handleLocaleChange(newLocale: string) {
+		setLocale(newLocale as any);
+	}
+	let languageItems = $derived(
+		getLanguageDropdownItems(supportedLocales, currentLocale, handleLocaleChange)
+	);
+	let currentLanguageLabel = $derived(getCurrentLanguageLabel(currentLocale));
+
+	// User email for user dropdown
+	let userEmail = $derived(authStore.user?.email || 'Menü');
+
+	// Navigation items for Calendar
+	const navItems: PillNavItem[] = [
+		{ href: '/', label: 'Kalender', icon: 'calendar' },
+		{ href: '/agenda', label: 'Agenda', icon: 'list' },
+		{ href: '/calendars', label: 'Meine Kalender', icon: 'document' },
+		{ href: '/settings', label: 'Einstellungen', icon: 'settings' },
+		{ href: '/feedback', label: 'Feedback', icon: 'chat' },
+	];
+
+	// Navigation shortcuts (Ctrl+1-5)
+	const navRoutes = navItems.map((item) => item.href);
+
+	function handleKeydown(event: KeyboardEvent) {
+		const target = event.target as HTMLElement;
+
+		if (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA' || target.isContentEditable) {
+			return;
+		}
+
+		if ((event.ctrlKey || event.metaKey) && !event.shiftKey && !event.altKey) {
+			const num = parseInt(event.key);
+			if (num >= 1 && num <= navRoutes.length) {
+				event.preventDefault();
+				const route = navRoutes[num - 1];
+				if (route) {
+					goto(route);
+				}
+			}
+		}
+	}
+
+	function handleModeChange(isSidebar: boolean) {
+		isSidebarMode = isSidebar;
+		sidebarModeStore.set(isSidebar);
+		if (typeof localStorage !== 'undefined') {
+			localStorage.setItem('calendar-nav-sidebar', String(isSidebar));
+		}
+	}
+
+	function handleCollapsedChange(collapsed: boolean) {
+		isCollapsed = collapsed;
+		collapsedStore.set(collapsed);
+		if (typeof localStorage !== 'undefined') {
+			localStorage.setItem('calendar-nav-collapsed', String(collapsed));
+		}
+	}
+
+	function handleToggleTheme() {
+		theme.toggleMode();
+	}
+
+	function handleThemeModeChange(mode: 'light' | 'dark' | 'system') {
+		theme.setMode(mode);
+	}
+
+	async function handleLogout() {
+		await authStore.signOut();
+		goto('/login');
+	}
+
+	onMount(async () => {
+		// Initialize theme
+		theme.initialize();
+
+		// Initialize view state
+		viewStore.initialize();
+
+		// Initialize auth
+		await authStore.initialize();
+
+		// Load calendars if authenticated
+		if (authStore.isAuthenticated) {
+			await calendarsStore.fetchCalendars();
+		}
+
+		// Initialize sidebar mode from localStorage
+		const savedSidebar = localStorage.getItem('calendar-nav-sidebar');
+		if (savedSidebar === 'true') {
+			isSidebarMode = true;
+			sidebarModeStore.set(true);
+		}
+
+		// Initialize collapsed state from localStorage
+		const savedCollapsed = localStorage.getItem('calendar-nav-collapsed');
+		if (savedCollapsed === 'true') {
+			isCollapsed = true;
+			collapsedStore.set(true);
+		}
+
+		loading = false;
+	});
+</script>
+
+<svelte:window onkeydown={handleKeydown} />
+
+<ToastContainer />
+
+{#if loading}
+	<div class="flex min-h-screen items-center justify-center bg-background">
+		<div class="text-center">
+			<div
+				class="mb-4 inline-block h-12 w-12 animate-spin rounded-full border-4 border-solid border-primary border-r-transparent"
+			></div>
+			<p class="text-muted-foreground">Laden...</p>
+		</div>
+	</div>
+{:else}
+	<div class="layout-container">
+		<PillNavigation
+			items={navItems}
+			currentPath={$page.url.pathname}
+			appName="Kalender"
+			homeRoute="/"
+			onToggleTheme={handleToggleTheme}
+			{isDark}
+			{isSidebarMode}
+			onModeChange={handleModeChange}
+			{isCollapsed}
+			onCollapsedChange={handleCollapsedChange}
+			showThemeToggle={true}
+			showThemeVariants={true}
+			{themeVariantItems}
+			{currentThemeVariantLabel}
+			themeMode={theme.mode}
+			onThemeModeChange={handleThemeModeChange}
+			showLanguageSwitcher={true}
+			{languageItems}
+			{currentLanguageLabel}
+			showLogout={authStore.isAuthenticated}
+			onLogout={handleLogout}
+			loginHref="/login"
+			primaryColor="#3b82f6"
+			showAppSwitcher={true}
+			{appItems}
+			{userEmail}
+			settingsHref="/settings"
+			manaHref="/mana"
+			profileHref="/profile"
+			allAppsHref="/apps"
+		/>
+
+		<main
+			class="main-content bg-background"
+			class:sidebar-mode={isSidebarMode && !isCollapsed}
+			class:floating-mode={!isSidebarMode && !isCollapsed}
+		>
+			<div class="content-wrapper">
+				{@render children()}
+			</div>
+		</main>
+	</div>
+{/if}
+
+<style>
+	.layout-container {
+		display: flex;
+		flex-direction: column;
+		min-height: 100vh;
+	}
+
+	.main-content {
+		flex: 1;
+		transition: all 300ms ease;
+	}
+
+	.main-content.floating-mode {
+		padding-top: 100px;
+	}
+
+	.main-content.sidebar-mode {
+		padding-left: 180px;
+	}
+
+	.content-wrapper {
+		max-width: 100%;
+		margin-left: auto;
+		margin-right: auto;
+		padding: 1rem;
+		height: calc(100vh - 100px);
+	}
+
+	.main-content.sidebar-mode .content-wrapper {
+		height: 100vh;
+	}
+
+	@media (min-width: 640px) {
+		.content-wrapper {
+			padding: 1.5rem;
+		}
+	}
+
+	@media (min-width: 1024px) {
+		.content-wrapper {
+			padding: 2rem;
+		}
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/routes/+page.svelte b/apps/calendar/apps/web/src/routes/+page.svelte
new file mode 100644
index 000000000..8e74aab5c
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/+page.svelte
@@ -0,0 +1,123 @@
+<script lang="ts">
+	import { onMount } from 'svelte';
+	import { goto } from '$app/navigation';
+	import { viewStore } from '$lib/stores/view.svelte';
+	import { eventsStore } from '$lib/stores/events.svelte';
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import CalendarHeader from '$lib/components/calendar/CalendarHeader.svelte';
+	import WeekView from '$lib/components/calendar/WeekView.svelte';
+	import DayView from '$lib/components/calendar/DayView.svelte';
+	import MonthView from '$lib/components/calendar/MonthView.svelte';
+	import MiniCalendar from '$lib/components/calendar/MiniCalendar.svelte';
+	import CalendarSidebar from '$lib/components/calendar/CalendarSidebar.svelte';
+	import { format } from 'date-fns';
+	import { de } from 'date-fns/locale';
+
+	let initialized = $state(false);
+
+	onMount(async () => {
+		if (!authStore.isAuthenticated) {
+			goto('/login');
+			return;
+		}
+
+		// Fetch events for current view range
+		await eventsStore.fetchEvents(viewStore.viewRange.start, viewStore.viewRange.end);
+		initialized = true;
+	});
+
+	// Refetch events when view changes
+	$effect(() => {
+		if (initialized && authStore.isAuthenticated) {
+			eventsStore.fetchEvents(viewStore.viewRange.start, viewStore.viewRange.end);
+		}
+	});
+
+	function handleDateSelect(date: Date) {
+		viewStore.setDate(date);
+	}
+
+	function handleNewEvent() {
+		goto('/event/new');
+	}
+</script>
+
+<svelte:head>
+	<title>Kalender</title>
+</svelte:head>
+
+<div class="calendar-layout">
+	<!-- Left Sidebar -->
+	<aside class="calendar-sidebar">
+		<button class="btn btn-primary w-full mb-4" onclick={handleNewEvent}>
+			<svg class="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+				<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4" />
+			</svg>
+			Neuer Termin
+		</button>
+
+		<MiniCalendar
+			selectedDate={viewStore.currentDate}
+			onDateSelect={handleDateSelect}
+		/>
+
+		<CalendarSidebar />
+	</aside>
+
+	<!-- Main Calendar Area -->
+	<div class="calendar-main">
+		<CalendarHeader />
+
+		<div class="calendar-content">
+			{#if viewStore.viewType === 'day'}
+				<DayView />
+			{:else if viewStore.viewType === 'week'}
+				<WeekView />
+			{:else if viewStore.viewType === 'month'}
+				<MonthView />
+			{:else}
+				<WeekView />
+			{/if}
+		</div>
+	</div>
+</div>
+
+<style>
+	.calendar-layout {
+		display: flex;
+		gap: 1.5rem;
+		height: 100%;
+		max-height: calc(100vh - 160px);
+	}
+
+	.calendar-sidebar {
+		width: 260px;
+		flex-shrink: 0;
+		display: flex;
+		flex-direction: column;
+		gap: 1rem;
+	}
+
+	.calendar-main {
+		flex: 1;
+		display: flex;
+		flex-direction: column;
+		min-width: 0;
+		background: hsl(var(--card));
+		border-radius: var(--radius-lg);
+		border: 1px solid hsl(var(--border));
+		overflow: hidden;
+	}
+
+	.calendar-content {
+		flex: 1;
+		overflow: auto;
+	}
+
+	@media (max-width: 1024px) {
+		.calendar-sidebar {
+			display: none;
+		}
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/routes/agenda/+page.svelte b/apps/calendar/apps/web/src/routes/agenda/+page.svelte
new file mode 100644
index 000000000..29f2acf9c
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/agenda/+page.svelte
@@ -0,0 +1,231 @@
+<script lang="ts">
+	import { onMount } from 'svelte';
+	import { goto } from '$app/navigation';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { eventsStore } from '$lib/stores/events.svelte';
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import { format, parseISO, isToday, isTomorrow, addDays, startOfDay, endOfDay } from 'date-fns';
+	import { de } from 'date-fns/locale';
+
+	let loading = $state(true);
+
+	// Group events by date
+	let groupedEvents = $derived.by(() => {
+		const groups: Map<string, typeof eventsStore.events> = new Map();
+
+		for (const event of eventsStore.events) {
+			const start = typeof event.startTime === 'string' ? parseISO(event.startTime) : event.startTime;
+			const dateKey = format(start, 'yyyy-MM-dd');
+
+			if (!groups.has(dateKey)) {
+				groups.set(dateKey, []);
+			}
+			groups.get(dateKey)!.push(event);
+		}
+
+		// Sort groups by date
+		return Array.from(groups.entries())
+			.sort(([a], [b]) => a.localeCompare(b))
+			.map(([dateKey, events]) => ({
+				date: parseISO(dateKey),
+				events: events.sort((a, b) => {
+					const aStart = typeof a.startTime === 'string' ? parseISO(a.startTime) : a.startTime;
+					const bStart = typeof b.startTime === 'string' ? parseISO(b.startTime) : b.startTime;
+					return aStart.getTime() - bStart.getTime();
+				}),
+			}));
+	});
+
+	onMount(async () => {
+		if (!authStore.isAuthenticated) {
+			goto('/login');
+			return;
+		}
+
+		// Fetch events for next 30 days
+		const start = startOfDay(new Date());
+		const end = endOfDay(addDays(start, 30));
+		await eventsStore.fetchEvents(start, end);
+		loading = false;
+	});
+
+	function formatDateHeader(date: Date) {
+		if (isToday(date)) {
+			return 'Heute';
+		}
+		if (isTomorrow(date)) {
+			return 'Morgen';
+		}
+		return format(date, 'EEEE, d. MMMM', { locale: de });
+	}
+
+	function handleEventClick(eventId: string) {
+		goto(`/event/${eventId}`);
+	}
+</script>
+
+<svelte:head>
+	<title>Agenda | Kalender</title>
+</svelte:head>
+
+<div class="agenda-page">
+	<header class="page-header">
+		<h1>Agenda</h1>
+		<p class="subtitle">Ihre kommenden Termine</p>
+	</header>
+
+	{#if loading}
+		<div class="loading">Laden...</div>
+	{:else if groupedEvents.length === 0}
+		<div class="empty-state card">
+			<p>Keine Termine in den nächsten 30 Tagen</p>
+			<button class="btn btn-primary" onclick={() => goto('/event/new')}>
+				Termin erstellen
+			</button>
+		</div>
+	{:else}
+		<div class="event-list">
+			{#each groupedEvents as group}
+				<div class="date-group">
+					<h2 class="date-header" class:today={isToday(group.date)}>
+						{formatDateHeader(group.date)}
+					</h2>
+
+					{#each group.events as event}
+						<button class="event-item card" onclick={() => handleEventClick(event.id)}>
+							<div
+								class="color-bar"
+								style="background-color: {calendarsStore.getColor(event.calendarId)}"
+							></div>
+							<div class="event-content">
+								<div class="event-time">
+									{#if event.isAllDay}
+										Ganztägig
+									{:else}
+										{format(typeof event.startTime === 'string' ? parseISO(event.startTime) : event.startTime, 'HH:mm')} -
+										{format(typeof event.endTime === 'string' ? parseISO(event.endTime) : event.endTime, 'HH:mm')}
+									{/if}
+								</div>
+								<div class="event-title">{event.title}</div>
+								{#if event.location}
+									<div class="event-location">{event.location}</div>
+								{/if}
+							</div>
+						</button>
+					{/each}
+				</div>
+			{/each}
+		</div>
+	{/if}
+</div>
+
+<style>
+	.agenda-page {
+		max-width: 600px;
+		margin: 0 auto;
+	}
+
+	.page-header {
+		margin-bottom: 2rem;
+	}
+
+	.page-header h1 {
+		font-size: 1.75rem;
+		font-weight: 700;
+		color: hsl(var(--foreground));
+		margin: 0 0 0.25rem 0;
+	}
+
+	.subtitle {
+		color: hsl(var(--muted-foreground));
+		margin: 0;
+	}
+
+	.loading {
+		text-align: center;
+		padding: 2rem;
+		color: hsl(var(--muted-foreground));
+	}
+
+	.empty-state {
+		text-align: center;
+		padding: 3rem;
+	}
+
+	.empty-state p {
+		color: hsl(var(--muted-foreground));
+		margin-bottom: 1rem;
+	}
+
+	.event-list {
+		display: flex;
+		flex-direction: column;
+		gap: 1.5rem;
+	}
+
+	.date-group {
+		display: flex;
+		flex-direction: column;
+		gap: 0.5rem;
+	}
+
+	.date-header {
+		font-size: 0.875rem;
+		font-weight: 600;
+		color: hsl(var(--muted-foreground));
+		text-transform: uppercase;
+		letter-spacing: 0.05em;
+		margin: 0;
+		padding-left: 0.5rem;
+	}
+
+	.date-header.today {
+		color: hsl(var(--primary));
+	}
+
+	.event-item {
+		display: flex;
+		gap: 1rem;
+		padding: 1rem;
+		cursor: pointer;
+		border: none;
+		text-align: left;
+		width: 100%;
+		transition: transform var(--transition-fast);
+	}
+
+	.event-item:hover {
+		transform: translateX(4px);
+	}
+
+	.color-bar {
+		width: 4px;
+		border-radius: 2px;
+		flex-shrink: 0;
+	}
+
+	.event-content {
+		flex: 1;
+		min-width: 0;
+	}
+
+	.event-time {
+		font-size: 0.75rem;
+		color: hsl(var(--muted-foreground));
+		margin-bottom: 0.25rem;
+	}
+
+	.event-title {
+		font-weight: 500;
+		color: hsl(var(--foreground));
+		white-space: nowrap;
+		overflow: hidden;
+		text-overflow: ellipsis;
+	}
+
+	.event-location {
+		font-size: 0.875rem;
+		color: hsl(var(--muted-foreground));
+		margin-top: 0.25rem;
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/routes/calendars/+page.svelte b/apps/calendar/apps/web/src/routes/calendars/+page.svelte
new file mode 100644
index 000000000..ffcfaae77
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/calendars/+page.svelte
@@ -0,0 +1,290 @@
+<script lang="ts">
+	import { onMount } from 'svelte';
+	import { goto } from '$app/navigation';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import { toast } from '$lib/stores/toast';
+	import type { Calendar } from '@calendar/shared';
+
+	let editingCalendar = $state<Calendar | null>(null);
+	let showNewForm = $state(false);
+	let newCalendarName = $state('');
+	let newCalendarColor = $state('#3b82f6');
+
+	onMount(async () => {
+		if (!authStore.isAuthenticated) {
+			goto('/login');
+			return;
+		}
+	});
+
+	async function handleCreateCalendar() {
+		if (!newCalendarName.trim()) return;
+
+		const result = await calendarsStore.createCalendar({
+			name: newCalendarName.trim(),
+			color: newCalendarColor,
+		});
+
+		if (result.error) {
+			toast.error(`Fehler: ${result.error.message}`);
+			return;
+		}
+
+		toast.success('Kalender erstellt');
+		newCalendarName = '';
+		showNewForm = false;
+	}
+
+	async function handleDeleteCalendar(calendar: Calendar) {
+		if (!confirm(`Möchten Sie "${calendar.name}" wirklich löschen?`)) {
+			return;
+		}
+
+		const result = await calendarsStore.deleteCalendar(calendar.id);
+
+		if (result.error) {
+			toast.error(`Fehler: ${result.error.message}`);
+			return;
+		}
+
+		toast.success('Kalender gelöscht');
+	}
+
+	async function handleUpdateCalendar(calendar: Calendar, name: string, color: string) {
+		const result = await calendarsStore.updateCalendar(calendar.id, { name, color });
+
+		if (result.error) {
+			toast.error(`Fehler: ${result.error.message}`);
+			return;
+		}
+
+		toast.success('Kalender aktualisiert');
+		editingCalendar = null;
+	}
+</script>
+
+<svelte:head>
+	<title>Meine Kalender | Kalender</title>
+</svelte:head>
+
+<div class="calendars-page">
+	<header class="page-header">
+		<h1>Meine Kalender</h1>
+		<button class="btn btn-primary" onclick={() => (showNewForm = true)}>
+			Neuer Kalender
+		</button>
+	</header>
+
+	{#if showNewForm}
+		<div class="card new-calendar-form">
+			<h2>Neuer Kalender</h2>
+			<form onsubmit={(e) => { e.preventDefault(); handleCreateCalendar(); }}>
+				<div class="form-row">
+					<input
+						type="text"
+						class="input"
+						placeholder="Kalender Name"
+						bind:value={newCalendarName}
+					/>
+					<input
+						type="color"
+						class="color-input"
+						bind:value={newCalendarColor}
+					/>
+				</div>
+				<div class="form-actions">
+					<button type="button" class="btn btn-ghost" onclick={() => (showNewForm = false)}>
+						Abbrechen
+					</button>
+					<button type="submit" class="btn btn-primary" disabled={!newCalendarName.trim()}>
+						Erstellen
+					</button>
+				</div>
+			</form>
+		</div>
+	{/if}
+
+	<div class="calendar-list">
+		{#each calendarsStore.calendars as calendar}
+			<div class="calendar-card card">
+				{#if editingCalendar?.id === calendar.id}
+					<form
+						onsubmit={(e) => {
+							e.preventDefault();
+							const form = e.target as HTMLFormElement;
+							const name = (form.elements.namedItem('name') as HTMLInputElement).value;
+							const color = (form.elements.namedItem('color') as HTMLInputElement).value;
+							handleUpdateCalendar(calendar, name, color);
+						}}
+					>
+						<div class="form-row">
+							<input
+								type="text"
+								name="name"
+								class="input"
+								value={calendar.name}
+							/>
+							<input
+								type="color"
+								name="color"
+								class="color-input"
+								value={calendar.color}
+							/>
+						</div>
+						<div class="form-actions">
+							<button type="button" class="btn btn-ghost" onclick={() => (editingCalendar = null)}>
+								Abbrechen
+							</button>
+							<button type="submit" class="btn btn-primary">
+								Speichern
+							</button>
+						</div>
+					</form>
+				{:else}
+					<div class="calendar-info">
+						<span class="color-dot" style="background-color: {calendar.color}"></span>
+						<span class="calendar-name">{calendar.name}</span>
+						{#if calendar.isDefault}
+							<span class="badge">Standard</span>
+						{/if}
+					</div>
+					<div class="calendar-actions">
+						<button
+							class="btn btn-ghost btn-sm"
+							onclick={() => (editingCalendar = calendar)}
+						>
+							Bearbeiten
+						</button>
+						{#if !calendar.isDefault}
+							<button
+								class="btn btn-ghost btn-sm text-destructive"
+								onclick={() => handleDeleteCalendar(calendar)}
+							>
+								Löschen
+							</button>
+						{/if}
+					</div>
+				{/if}
+			</div>
+		{/each}
+
+		{#if calendarsStore.calendars.length === 0}
+			<div class="empty-state card">
+				<p>Keine Kalender vorhanden</p>
+			</div>
+		{/if}
+	</div>
+</div>
+
+<style>
+	.calendars-page {
+		max-width: 600px;
+		margin: 0 auto;
+	}
+
+	.page-header {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		margin-bottom: 1.5rem;
+	}
+
+	.page-header h1 {
+		font-size: 1.5rem;
+		font-weight: 600;
+		margin: 0;
+	}
+
+	.new-calendar-form {
+		margin-bottom: 1.5rem;
+	}
+
+	.new-calendar-form h2 {
+		font-size: 1rem;
+		font-weight: 600;
+		margin: 0 0 1rem 0;
+	}
+
+	.form-row {
+		display: flex;
+		gap: 0.75rem;
+		margin-bottom: 1rem;
+	}
+
+	.form-row .input {
+		flex: 1;
+	}
+
+	.color-input {
+		width: 48px;
+		height: 42px;
+		padding: 4px;
+		border: 2px solid hsl(var(--border));
+		border-radius: var(--radius-md);
+		cursor: pointer;
+	}
+
+	.form-actions {
+		display: flex;
+		justify-content: flex-end;
+		gap: 0.5rem;
+	}
+
+	.calendar-list {
+		display: flex;
+		flex-direction: column;
+		gap: 0.75rem;
+	}
+
+	.calendar-card {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		padding: 1rem;
+	}
+
+	.calendar-info {
+		display: flex;
+		align-items: center;
+		gap: 0.75rem;
+	}
+
+	.color-dot {
+		width: 16px;
+		height: 16px;
+		border-radius: var(--radius-full);
+	}
+
+	.calendar-name {
+		font-weight: 500;
+	}
+
+	.badge {
+		font-size: 0.75rem;
+		padding: 0.125rem 0.5rem;
+		background: hsl(var(--muted));
+		border-radius: var(--radius-sm);
+		color: hsl(var(--muted-foreground));
+	}
+
+	.calendar-actions {
+		display: flex;
+		gap: 0.5rem;
+	}
+
+	.btn-sm {
+		padding: 0.25rem 0.75rem;
+		font-size: 0.875rem;
+	}
+
+	.text-destructive {
+		color: hsl(var(--destructive));
+	}
+
+	.empty-state {
+		text-align: center;
+		padding: 2rem;
+		color: hsl(var(--muted-foreground));
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/routes/event/[id]/+page.svelte b/apps/calendar/apps/web/src/routes/event/[id]/+page.svelte
new file mode 100644
index 000000000..1125b4bde
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/event/[id]/+page.svelte
@@ -0,0 +1,203 @@
+<script lang="ts">
+	import { page } from '$app/stores';
+	import { goto } from '$app/navigation';
+	import { onMount } from 'svelte';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { eventsStore } from '$lib/stores/events.svelte';
+	import { toast } from '$lib/stores/toast';
+	import EventForm from '$lib/components/event/EventForm.svelte';
+	import type { CalendarEvent, UpdateEventInput } from '@calendar/shared';
+	import * as api from '$lib/api/events';
+
+	let event = $state<CalendarEvent | null>(null);
+	let loading = $state(true);
+	let isEditing = $state(false);
+
+	onMount(async () => {
+		if (!authStore.isAuthenticated) {
+			goto('/login');
+			return;
+		}
+
+		const eventId = $page.params.id;
+		const result = await api.getEvent(eventId);
+
+		if (result.error) {
+			toast.error('Termin nicht gefunden');
+			goto('/');
+			return;
+		}
+
+		event = result.data;
+		loading = false;
+	});
+
+	async function handleSave(data: UpdateEventInput) {
+		if (!event) return;
+
+		const result = await eventsStore.updateEvent(event.id, data);
+
+		if (result.error) {
+			toast.error(`Fehler beim Speichern: ${result.error.message}`);
+			return;
+		}
+
+		toast.success('Termin aktualisiert');
+		isEditing = false;
+		event = result.data;
+	}
+
+	async function handleDelete() {
+		if (!event) return;
+
+		if (!confirm('Möchten Sie diesen Termin wirklich löschen?')) {
+			return;
+		}
+
+		const result = await eventsStore.deleteEvent(event.id);
+
+		if (result.error) {
+			toast.error(`Fehler beim Löschen: ${result.error.message}`);
+			return;
+		}
+
+		toast.success('Termin gelöscht');
+		goto('/');
+	}
+
+	function handleCancel() {
+		if (isEditing) {
+			isEditing = false;
+		} else {
+			goto('/');
+		}
+	}
+</script>
+
+<svelte:head>
+	<title>{event?.title || 'Termin'} | Kalender</title>
+</svelte:head>
+
+<div class="page-container">
+	{#if loading}
+		<div class="loading">Laden...</div>
+	{:else if event}
+		<div class="card">
+			<div class="header">
+				<h1 class="page-title">{isEditing ? 'Termin bearbeiten' : event.title}</h1>
+				{#if !isEditing}
+					<div class="actions">
+						<button class="btn btn-ghost" onclick={() => (isEditing = true)}>
+							Bearbeiten
+						</button>
+						<button class="btn btn-ghost text-destructive" onclick={handleDelete}>
+							Löschen
+						</button>
+					</div>
+				{/if}
+			</div>
+
+			{#if isEditing}
+				<EventForm
+					mode="edit"
+					{event}
+					onSave={handleSave}
+					onCancel={handleCancel}
+				/>
+			{:else}
+				<div class="event-details">
+					<div class="detail-row">
+						<span class="label">Zeit</span>
+						<span class="value">
+							{#if event.isAllDay}
+								Ganztägig
+							{:else}
+								{new Date(event.startTime).toLocaleString('de-DE')} -
+								{new Date(event.endTime).toLocaleString('de-DE')}
+							{/if}
+						</span>
+					</div>
+
+					{#if event.location}
+						<div class="detail-row">
+							<span class="label">Ort</span>
+							<span class="value">{event.location}</span>
+						</div>
+					{/if}
+
+					{#if event.description}
+						<div class="detail-row">
+							<span class="label">Beschreibung</span>
+							<span class="value">{event.description}</span>
+						</div>
+					{/if}
+
+					<div class="detail-row">
+						<button class="btn btn-ghost" onclick={() => goto('/')}>
+							Zurück zum Kalender
+						</button>
+					</div>
+				</div>
+			{/if}
+		</div>
+	{/if}
+</div>
+
+<style>
+	.page-container {
+		max-width: 600px;
+		margin: 0 auto;
+	}
+
+	.header {
+		display: flex;
+		align-items: flex-start;
+		justify-content: space-between;
+		margin-bottom: 1.5rem;
+	}
+
+	.page-title {
+		font-size: 1.5rem;
+		font-weight: 600;
+		color: hsl(var(--foreground));
+		margin: 0;
+	}
+
+	.actions {
+		display: flex;
+		gap: 0.5rem;
+	}
+
+	.loading {
+		text-align: center;
+		padding: 2rem;
+		color: hsl(var(--muted-foreground));
+	}
+
+	.event-details {
+		display: flex;
+		flex-direction: column;
+		gap: 1rem;
+	}
+
+	.detail-row {
+		display: flex;
+		flex-direction: column;
+		gap: 0.25rem;
+	}
+
+	.label {
+		font-size: 0.875rem;
+		font-weight: 500;
+		color: hsl(var(--muted-foreground));
+	}
+
+	.value {
+		font-size: 1rem;
+		color: hsl(var(--foreground));
+	}
+
+	.text-destructive {
+		color: hsl(var(--destructive));
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/routes/event/new/+page.svelte b/apps/calendar/apps/web/src/routes/event/new/+page.svelte
new file mode 100644
index 000000000..bc8f5f7aa
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/event/new/+page.svelte
@@ -0,0 +1,73 @@
+<script lang="ts">
+	import { page } from '$app/stores';
+	import { goto } from '$app/navigation';
+	import { onMount } from 'svelte';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { eventsStore } from '$lib/stores/events.svelte';
+	import { calendarsStore } from '$lib/stores/calendars.svelte';
+	import { toast } from '$lib/stores/toast';
+	import EventForm from '$lib/components/event/EventForm.svelte';
+	import type { CreateEventInput } from '@calendar/shared';
+	import { addHours, parseISO } from 'date-fns';
+
+	let initialStart = $state<Date | null>(null);
+
+	onMount(() => {
+		if (!authStore.isAuthenticated) {
+			goto('/login');
+			return;
+		}
+
+		// Check for start time in URL params
+		const startParam = $page.url.searchParams.get('start');
+		if (startParam) {
+			initialStart = parseISO(startParam);
+		}
+	});
+
+	async function handleSave(data: CreateEventInput) {
+		const result = await eventsStore.createEvent(data);
+
+		if (result.error) {
+			toast.error(`Fehler beim Erstellen: ${result.error.message}`);
+			return;
+		}
+
+		toast.success('Termin erstellt');
+		goto('/');
+	}
+
+	function handleCancel() {
+		goto('/');
+	}
+</script>
+
+<svelte:head>
+	<title>Neuer Termin | Kalender</title>
+</svelte:head>
+
+<div class="page-container">
+	<div class="card">
+		<h1 class="page-title">Neuer Termin</h1>
+		<EventForm
+			mode="create"
+			initialStartTime={initialStart}
+			onSave={handleSave}
+			onCancel={handleCancel}
+		/>
+	</div>
+</div>
+
+<style>
+	.page-container {
+		max-width: 600px;
+		margin: 0 auto;
+	}
+
+	.page-title {
+		font-size: 1.5rem;
+		font-weight: 600;
+		margin-bottom: 1.5rem;
+		color: hsl(var(--foreground));
+	}
+</style>
diff --git a/apps/calendar/apps/web/src/routes/feedback/+page.svelte b/apps/calendar/apps/web/src/routes/feedback/+page.svelte
new file mode 100644
index 000000000..a174ea5a2
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/feedback/+page.svelte
@@ -0,0 +1,47 @@
+<script lang="ts">
+	import { onMount } from 'svelte';
+	import { goto } from '$app/navigation';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { toast } from '$lib/stores/toast';
+	import { FeedbackPage } from '@manacore/shared-feedback-ui';
+	import { createFeedbackService } from '@manacore/shared-feedback-service';
+	import { env } from '$env/dynamic/public';
+
+	const feedbackService = createFeedbackService(
+		env.PUBLIC_BACKEND_URL || 'http://localhost:3014'
+	);
+
+	onMount(() => {
+		if (!authStore.isAuthenticated) {
+			goto('/login');
+			return;
+		}
+	});
+
+	async function handleSubmit(type: string, message: string) {
+		const token = await authStore.getAccessToken();
+		if (!token) {
+			toast.error('Bitte melden Sie sich an');
+			return { success: false, error: 'Not authenticated' };
+		}
+
+		const result = await feedbackService.submit(
+			{ type: type as any, message },
+			token
+		);
+
+		if (!result.success) {
+			toast.error(result.error || 'Fehler beim Senden');
+			return result;
+		}
+
+		toast.success('Feedback gesendet. Vielen Dank!');
+		return result;
+	}
+</script>
+
+<svelte:head>
+	<title>Feedback | Kalender</title>
+</svelte:head>
+
+<FeedbackPage onSubmit={handleSubmit} appName="Kalender" />
diff --git a/apps/calendar/apps/web/src/routes/settings/+page.svelte b/apps/calendar/apps/web/src/routes/settings/+page.svelte
new file mode 100644
index 000000000..fb2409bd6
--- /dev/null
+++ b/apps/calendar/apps/web/src/routes/settings/+page.svelte
@@ -0,0 +1,240 @@
+<script lang="ts">
+	import { onMount } from 'svelte';
+	import { goto } from '$app/navigation';
+	import { authStore } from '$lib/stores/auth.svelte';
+	import { theme } from '$lib/stores/theme';
+	import { THEME_DEFINITIONS } from '@manacore/shared-theme';
+
+	onMount(() => {
+		if (!authStore.isAuthenticated) {
+			goto('/login');
+			return;
+		}
+	});
+
+	function handleThemeChange(mode: 'light' | 'dark' | 'system') {
+		theme.setMode(mode);
+	}
+</script>
+
+<svelte:head>
+	<title>Einstellungen | Kalender</title>
+</svelte:head>
+
+<div class="settings-page">
+	<header class="page-header">
+		<h1>Einstellungen</h1>
+	</header>
+
+	<section class="settings-section card">
+		<h2>Erscheinungsbild</h2>
+
+		<div class="setting-item">
+			<div class="setting-info">
+				<span class="setting-label">Design-Modus</span>
+				<span class="setting-description">Wählen Sie zwischen hell, dunkel oder automatisch</span>
+			</div>
+			<div class="theme-options">
+				<button
+					class="theme-option"
+					class:active={theme.mode === 'light'}
+					onclick={() => handleThemeChange('light')}
+				>
+					<svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<circle cx="12" cy="12" r="5"></circle>
+						<path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"></path>
+					</svg>
+					Hell
+				</button>
+				<button
+					class="theme-option"
+					class:active={theme.mode === 'dark'}
+					onclick={() => handleThemeChange('dark')}
+				>
+					<svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path>
+					</svg>
+					Dunkel
+				</button>
+				<button
+					class="theme-option"
+					class:active={theme.mode === 'system'}
+					onclick={() => handleThemeChange('system')}
+				>
+					<svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<rect x="2" y="3" width="20" height="14" rx="2" ry="2"></rect>
+						<line x1="8" y1="21" x2="16" y2="21"></line>
+						<line x1="12" y1="17" x2="12" y2="21"></line>
+					</svg>
+					System
+				</button>
+			</div>
+		</div>
+
+		<div class="setting-item">
+			<div class="setting-info">
+				<span class="setting-label">Farbschema</span>
+				<span class="setting-description">Wählen Sie ein Farbschema für die App</span>
+			</div>
+			<div class="variant-grid">
+				{#each theme.variants as variant}
+					<button
+						class="variant-option"
+						class:active={theme.variant === variant}
+						onclick={() => theme.setVariant(variant)}
+					>
+						<span class="variant-icon">{THEME_DEFINITIONS[variant].icon}</span>
+						<span class="variant-label">{THEME_DEFINITIONS[variant].label}</span>
+					</button>
+				{/each}
+			</div>
+		</div>
+	</section>
+
+	<section class="settings-section card">
+		<h2>Konto</h2>
+
+		<div class="setting-item">
+			<div class="setting-info">
+				<span class="setting-label">E-Mail</span>
+				<span class="setting-value">{authStore.user?.email || '-'}</span>
+			</div>
+		</div>
+
+		<div class="setting-item">
+			<button class="btn btn-ghost text-destructive" onclick={() => authStore.signOut().then(() => goto('/login'))}>
+				Abmelden
+			</button>
+		</div>
+	</section>
+</div>
+
+<style>
+	.settings-page {
+		max-width: 600px;
+		margin: 0 auto;
+	}
+
+	.page-header {
+		margin-bottom: 1.5rem;
+	}
+
+	.page-header h1 {
+		font-size: 1.5rem;
+		font-weight: 600;
+		margin: 0;
+	}
+
+	.settings-section {
+		margin-bottom: 1.5rem;
+	}
+
+	.settings-section h2 {
+		font-size: 1rem;
+		font-weight: 600;
+		margin: 0 0 1rem 0;
+		padding-bottom: 0.75rem;
+		border-bottom: 1px solid hsl(var(--border));
+	}
+
+	.setting-item {
+		padding: 1rem 0;
+		border-bottom: 1px solid hsl(var(--border) / 0.5);
+	}
+
+	.setting-item:last-child {
+		border-bottom: none;
+		padding-bottom: 0;
+	}
+
+	.setting-info {
+		display: flex;
+		flex-direction: column;
+		gap: 0.25rem;
+		margin-bottom: 0.75rem;
+	}
+
+	.setting-label {
+		font-weight: 500;
+		color: hsl(var(--foreground));
+	}
+
+	.setting-description {
+		font-size: 0.875rem;
+		color: hsl(var(--muted-foreground));
+	}
+
+	.setting-value {
+		font-size: 0.875rem;
+		color: hsl(var(--muted-foreground));
+	}
+
+	.theme-options {
+		display: flex;
+		gap: 0.5rem;
+	}
+
+	.theme-option {
+		display: flex;
+		align-items: center;
+		gap: 0.5rem;
+		padding: 0.5rem 1rem;
+		border: 2px solid hsl(var(--border));
+		border-radius: var(--radius-md);
+		background: transparent;
+		color: hsl(var(--foreground));
+		font-size: 0.875rem;
+		cursor: pointer;
+		transition: all 150ms ease;
+	}
+
+	.theme-option:hover {
+		border-color: hsl(var(--primary) / 0.5);
+	}
+
+	.theme-option.active {
+		border-color: hsl(var(--primary));
+		background: hsl(var(--primary) / 0.1);
+	}
+
+	.variant-grid {
+		display: grid;
+		grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
+		gap: 0.5rem;
+	}
+
+	.variant-option {
+		display: flex;
+		flex-direction: column;
+		align-items: center;
+		gap: 0.25rem;
+		padding: 0.75rem;
+		border: 2px solid hsl(var(--border));
+		border-radius: var(--radius-md);
+		background: transparent;
+		cursor: pointer;
+		transition: all 150ms ease;
+	}
+
+	.variant-option:hover {
+		border-color: hsl(var(--primary) / 0.5);
+	}
+
+	.variant-option.active {
+		border-color: hsl(var(--primary));
+		background: hsl(var(--primary) / 0.1);
+	}
+
+	.variant-icon {
+		font-size: 1.5rem;
+	}
+
+	.variant-label {
+		font-size: 0.75rem;
+		color: hsl(var(--muted-foreground));
+	}
+
+	.text-destructive {
+		color: hsl(var(--destructive));
+	}
+</style>
diff --git a/apps/calendar/apps/web/svelte.config.js b/apps/calendar/apps/web/svelte.config.js
new file mode 100644
index 000000000..c8b303bb6
--- /dev/null
+++ b/apps/calendar/apps/web/svelte.config.js
@@ -0,0 +1,12 @@
+import adapter from '@sveltejs/adapter-auto';
+import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+	preprocess: vitePreprocess(),
+	kit: {
+		adapter: adapter(),
+	},
+};
+
+export default config;
diff --git a/apps/calendar/apps/web/tsconfig.json b/apps/calendar/apps/web/tsconfig.json
new file mode 100644
index 000000000..a8f10c8e3
--- /dev/null
+++ b/apps/calendar/apps/web/tsconfig.json
@@ -0,0 +1,14 @@
+{
+	"extends": "./.svelte-kit/tsconfig.json",
+	"compilerOptions": {
+		"allowJs": true,
+		"checkJs": true,
+		"esModuleInterop": true,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"skipLibCheck": true,
+		"sourceMap": true,
+		"strict": true,
+		"moduleResolution": "bundler"
+	}
+}
diff --git a/apps/calendar/apps/web/vite.config.ts b/apps/calendar/apps/web/vite.config.ts
new file mode 100644
index 000000000..ee69c8ce4
--- /dev/null
+++ b/apps/calendar/apps/web/vite.config.ts
@@ -0,0 +1,45 @@
+import { sveltekit } from '@sveltejs/kit/vite';
+import tailwindcss from '@tailwindcss/vite';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+	plugins: [tailwindcss(), sveltekit()],
+	server: {
+		port: 5179,
+		strictPort: true,
+	},
+	ssr: {
+		noExternal: [
+			'@calendar/shared',
+			'@manacore/shared-icons',
+			'@manacore/shared-ui',
+			'@manacore/shared-tailwind',
+			'@manacore/shared-theme',
+			'@manacore/shared-theme-ui',
+			'@manacore/shared-feedback-ui',
+			'@manacore/shared-feedback-service',
+			'@manacore/shared-feedback-types',
+			'@manacore/shared-auth',
+			'@manacore/shared-auth-ui',
+			'@manacore/shared-branding',
+			'@manacore/shared-subscription-ui',
+		],
+	},
+	optimizeDeps: {
+		exclude: [
+			'@calendar/shared',
+			'@manacore/shared-icons',
+			'@manacore/shared-ui',
+			'@manacore/shared-tailwind',
+			'@manacore/shared-theme',
+			'@manacore/shared-theme-ui',
+			'@manacore/shared-feedback-ui',
+			'@manacore/shared-feedback-service',
+			'@manacore/shared-feedback-types',
+			'@manacore/shared-auth',
+			'@manacore/shared-auth-ui',
+			'@manacore/shared-branding',
+			'@manacore/shared-subscription-ui',
+		],
+	},
+});
diff --git a/apps/calendar/package.json b/apps/calendar/package.json
new file mode 100644
index 000000000..3133b8029
--- /dev/null
+++ b/apps/calendar/package.json
@@ -0,0 +1,23 @@
+{
+	"name": "calendar",
+	"version": "1.0.0",
+	"private": true,
+	"description": "Calendar App - Personal and Shared Calendars with CalDAV/iCal Sync",
+	"scripts": {
+		"dev": "turbo run dev",
+		"dev:backend": "pnpm --filter @calendar/backend dev",
+		"dev:web": "pnpm --filter @calendar/web dev",
+		"dev:landing": "pnpm --filter @calendar/landing dev",
+		"dev:mobile": "pnpm --filter @calendar/mobile dev",
+		"build": "turbo run build",
+		"lint": "turbo run lint",
+		"clean": "turbo run clean",
+		"db:push": "pnpm --filter @calendar/backend db:push",
+		"db:studio": "pnpm --filter @calendar/backend db:studio",
+		"db:seed": "pnpm --filter @calendar/backend db:seed"
+	},
+	"devDependencies": {
+		"typescript": "^5.9.3"
+	},
+	"packageManager": "pnpm@9.15.0"
+}
diff --git a/apps/calendar/packages/shared/package.json b/apps/calendar/packages/shared/package.json
new file mode 100644
index 000000000..d1ac845de
--- /dev/null
+++ b/apps/calendar/packages/shared/package.json
@@ -0,0 +1,21 @@
+{
+	"name": "@calendar/shared",
+	"version": "1.0.0",
+	"type": "module",
+	"main": "./src/index.ts",
+	"types": "./src/index.ts",
+	"exports": {
+		".": "./src/index.ts",
+		"./types": "./src/types/index.ts",
+		"./utils": "./src/utils/index.ts",
+		"./constants": "./src/constants/index.ts"
+	},
+	"scripts": {
+		"type-check": "tsc --noEmit",
+		"lint": "eslint src"
+	},
+	"devDependencies": {
+		"typescript": "~5.9.2"
+	},
+	"dependencies": {}
+}
diff --git a/apps/calendar/packages/shared/src/constants/index.ts b/apps/calendar/packages/shared/src/constants/index.ts
new file mode 100644
index 000000000..5cd1cd3c7
--- /dev/null
+++ b/apps/calendar/packages/shared/src/constants/index.ts
@@ -0,0 +1,121 @@
+/**
+ * Calendar constants and configuration
+ */
+
+/**
+ * Default timezone
+ */
+export const DEFAULT_TIMEZONE = 'Europe/Berlin';
+
+/**
+ * Default calendar color
+ */
+export const DEFAULT_CALENDAR_COLOR = '#3B82F6';
+
+/**
+ * Default event duration in minutes
+ */
+export const DEFAULT_EVENT_DURATION = 60;
+
+/**
+ * Default reminder offset in minutes
+ */
+export const DEFAULT_REMINDER_MINUTES = 15;
+
+/**
+ * Available calendar colors
+ */
+export const CALENDAR_COLORS = [
+	{ value: '#3B82F6', label: 'Blue' },
+	{ value: '#EF4444', label: 'Red' },
+	{ value: '#10B981', label: 'Green' },
+	{ value: '#F59E0B', label: 'Amber' },
+	{ value: '#8B5CF6', label: 'Violet' },
+	{ value: '#EC4899', label: 'Pink' },
+	{ value: '#06B6D4', label: 'Cyan' },
+	{ value: '#F97316', label: 'Orange' },
+	{ value: '#6366F1', label: 'Indigo' },
+	{ value: '#84CC16', label: 'Lime' },
+	{ value: '#14B8A6', label: 'Teal' },
+	{ value: '#A855F7', label: 'Purple' },
+] as const;
+
+/**
+ * Common timezones
+ */
+export const COMMON_TIMEZONES = [
+	'Europe/Berlin',
+	'Europe/London',
+	'Europe/Paris',
+	'Europe/Rome',
+	'Europe/Madrid',
+	'Europe/Amsterdam',
+	'Europe/Vienna',
+	'Europe/Zurich',
+	'America/New_York',
+	'America/Chicago',
+	'America/Denver',
+	'America/Los_Angeles',
+	'America/Toronto',
+	'Asia/Tokyo',
+	'Asia/Shanghai',
+	'Asia/Singapore',
+	'Asia/Dubai',
+	'Australia/Sydney',
+	'Pacific/Auckland',
+	'UTC',
+] as const;
+
+/**
+ * View types
+ */
+export const VIEW_TYPES = ['day', 'week', 'month', 'year', 'agenda'] as const;
+
+export type ViewType = (typeof VIEW_TYPES)[number];
+
+/**
+ * View type labels
+ */
+export const VIEW_TYPE_LABELS: Record<ViewType, string> = {
+	day: 'Day',
+	week: 'Week',
+	month: 'Month',
+	year: 'Year',
+	agenda: 'Agenda',
+};
+
+/**
+ * Hour format options
+ */
+export const HOUR_FORMATS = ['12h', '24h'] as const;
+
+export type HourFormat = (typeof HOUR_FORMATS)[number];
+
+/**
+ * Week start options
+ */
+export const WEEK_START_OPTIONS = [
+	{ value: 0, label: 'Sunday' },
+	{ value: 1, label: 'Monday' },
+] as const;
+
+/**
+ * Backend API routes
+ */
+export const API_ROUTES = {
+	HEALTH: '/api/v1/health',
+	CALENDARS: '/api/v1/calendars',
+	EVENTS: '/api/v1/events',
+	REMINDERS: '/api/v1/reminders',
+	SHARES: '/api/v1/shares',
+	SYNC: '/api/v1/sync',
+} as const;
+
+/**
+ * Calendar app metadata
+ */
+export const APP_METADATA = {
+	name: 'Calendar',
+	description: 'Personal and Shared Calendars with CalDAV/iCal Sync',
+	version: '1.0.0',
+} as const;
diff --git a/apps/calendar/packages/shared/src/index.ts b/apps/calendar/packages/shared/src/index.ts
new file mode 100644
index 000000000..03cdff750
--- /dev/null
+++ b/apps/calendar/packages/shared/src/index.ts
@@ -0,0 +1,6 @@
+// Calendar Shared Package
+// Types, Utils, and Constants for Calendar App
+
+export * from './types';
+export * from './utils';
+export * from './constants';
diff --git a/apps/calendar/packages/shared/src/types/calendar.ts b/apps/calendar/packages/shared/src/types/calendar.ts
new file mode 100644
index 000000000..25f5ba276
--- /dev/null
+++ b/apps/calendar/packages/shared/src/types/calendar.ts
@@ -0,0 +1,79 @@
+/**
+ * Calendar settings stored in JSONB
+ */
+export interface CalendarSettings {
+	/** Default view when opening the calendar */
+	defaultView?: 'day' | 'week' | 'month' | 'year' | 'agenda';
+	/** 0 = Sunday, 1 = Monday */
+	weekStartsOn?: 0 | 1;
+	/** Show week numbers in calendar views */
+	showWeekNumbers?: boolean;
+	/** Default event duration in minutes */
+	defaultEventDuration?: number;
+	/** Default reminder offset in minutes before event */
+	defaultReminder?: number;
+}
+
+/**
+ * Calendar entity
+ */
+export interface Calendar {
+	id: string;
+	userId: string;
+	name: string;
+	description?: string | null;
+	color: string;
+	isDefault: boolean;
+	isVisible: boolean;
+	timezone: string;
+	settings?: CalendarSettings | null;
+	createdAt: Date | string;
+	updatedAt: Date | string;
+}
+
+/**
+ * Data required to create a new calendar
+ */
+export interface CreateCalendarInput {
+	name: string;
+	description?: string;
+	color?: string;
+	isDefault?: boolean;
+	isVisible?: boolean;
+	timezone?: string;
+	settings?: CalendarSettings;
+}
+
+/**
+ * Data for updating a calendar
+ */
+export interface UpdateCalendarInput {
+	name?: string;
+	description?: string | null;
+	color?: string;
+	isDefault?: boolean;
+	isVisible?: boolean;
+	timezone?: string;
+	settings?: CalendarSettings;
+}
+
+/**
+ * Calendar view types
+ */
+export type CalendarViewType = 'day' | 'week' | 'month' | 'year' | 'agenda';
+
+/**
+ * Default calendar colors
+ */
+export const DEFAULT_CALENDAR_COLORS = [
+	'#3B82F6', // Blue
+	'#EF4444', // Red
+	'#10B981', // Green
+	'#F59E0B', // Amber
+	'#8B5CF6', // Violet
+	'#EC4899', // Pink
+	'#06B6D4', // Cyan
+	'#F97316', // Orange
+] as const;
+
+export type CalendarColor = (typeof DEFAULT_CALENDAR_COLORS)[number];
diff --git a/apps/calendar/packages/shared/src/types/event.ts b/apps/calendar/packages/shared/src/types/event.ts
new file mode 100644
index 000000000..6f988977d
--- /dev/null
+++ b/apps/calendar/packages/shared/src/types/event.ts
@@ -0,0 +1,140 @@
+/**
+ * Event attendee information
+ */
+export interface EventAttendee {
+	email: string;
+	name?: string;
+	status?: 'accepted' | 'declined' | 'tentative' | 'pending';
+}
+
+/**
+ * Event metadata stored in JSONB
+ */
+export interface EventMetadata {
+	/** URL associated with the event */
+	url?: string;
+	/** Video conference URL (Zoom, Meet, etc.) */
+	conferenceUrl?: string;
+	/** Event attendees */
+	attendees?: EventAttendee[];
+	/** Event organizer email */
+	organizer?: string;
+	/** Event priority */
+	priority?: 'low' | 'normal' | 'high';
+	/** Tags/labels for the event */
+	tags?: string[];
+}
+
+/**
+ * Event status
+ */
+export type EventStatus = 'confirmed' | 'tentative' | 'cancelled';
+
+/**
+ * Calendar event entity
+ */
+export interface CalendarEvent {
+	id: string;
+	calendarId: string;
+	userId: string;
+
+	// Basic info
+	title: string;
+	description?: string | null;
+	location?: string | null;
+
+	// Timing
+	startTime: Date | string;
+	endTime: Date | string;
+	isAllDay: boolean;
+	timezone: string;
+
+	// Recurrence (RFC 5545 RRULE format)
+	recurrenceRule?: string | null;
+	recurrenceEndDate?: Date | string | null;
+	recurrenceExceptions?: string[] | null;
+	parentEventId?: string | null;
+
+	// Appearance
+	color?: string | null;
+
+	// Status
+	status: EventStatus;
+
+	// External sync
+	externalId?: string | null;
+	externalCalendarId?: string | null;
+	lastSyncedAt?: Date | string | null;
+
+	// Metadata
+	metadata?: EventMetadata | null;
+
+	createdAt: Date | string;
+	updatedAt: Date | string;
+}
+
+/**
+ * Event with optional calendar reference (for display)
+ */
+export interface CalendarEventWithCalendar extends CalendarEvent {
+	calendar?: {
+		id: string;
+		name: string;
+		color: string;
+	};
+}
+
+/**
+ * Data required to create a new event
+ */
+export interface CreateEventInput {
+	calendarId: string;
+	title: string;
+	description?: string;
+	location?: string;
+	startTime: Date | string;
+	endTime: Date | string;
+	isAllDay?: boolean;
+	timezone?: string;
+	recurrenceRule?: string;
+	recurrenceEndDate?: Date | string;
+	color?: string;
+	status?: EventStatus;
+	metadata?: EventMetadata;
+}
+
+/**
+ * Data for updating an event
+ */
+export interface UpdateEventInput {
+	calendarId?: string;
+	title?: string;
+	description?: string | null;
+	location?: string | null;
+	startTime?: Date | string;
+	endTime?: Date | string;
+	isAllDay?: boolean;
+	timezone?: string;
+	recurrenceRule?: string | null;
+	recurrenceEndDate?: Date | string | null;
+	recurrenceExceptions?: string[];
+	color?: string | null;
+	status?: EventStatus;
+	metadata?: EventMetadata;
+}
+
+/**
+ * Query parameters for fetching events
+ */
+export interface QueryEventsInput {
+	/** Start of date range */
+	startDate: Date | string;
+	/** End of date range */
+	endDate: Date | string;
+	/** Filter by calendar IDs */
+	calendarIds?: string[];
+	/** Include cancelled events */
+	includeCancelled?: boolean;
+	/** Search term for title/description */
+	search?: string;
+}
diff --git a/apps/calendar/packages/shared/src/types/index.ts b/apps/calendar/packages/shared/src/types/index.ts
new file mode 100644
index 000000000..247facc38
--- /dev/null
+++ b/apps/calendar/packages/shared/src/types/index.ts
@@ -0,0 +1,7 @@
+// Calendar Types
+export * from './calendar';
+export * from './event';
+export * from './reminder';
+export * from './share';
+export * from './recurrence';
+export * from './sync';
diff --git a/apps/calendar/packages/shared/src/types/recurrence.ts b/apps/calendar/packages/shared/src/types/recurrence.ts
new file mode 100644
index 000000000..4be8cdcfd
--- /dev/null
+++ b/apps/calendar/packages/shared/src/types/recurrence.ts
@@ -0,0 +1,69 @@
+/**
+ * Recurrence frequency (RFC 5545)
+ */
+export type RecurrenceFrequency = 'DAILY' | 'WEEKLY' | 'MONTHLY' | 'YEARLY';
+
+/**
+ * Day of week (RFC 5545)
+ */
+export type Weekday = 'MO' | 'TU' | 'WE' | 'TH' | 'FR' | 'SA' | 'SU';
+
+/**
+ * Parsed recurrence pattern
+ */
+export interface RecurrencePattern {
+	/** Frequency of recurrence */
+	frequency: RecurrenceFrequency;
+	/** Interval between occurrences (e.g., every 2 weeks) */
+	interval?: number;
+	/** Days of the week (for WEEKLY frequency) */
+	byDay?: Weekday[];
+	/** Day of the month (for MONTHLY frequency) */
+	byMonthDay?: number[];
+	/** Month of the year (for YEARLY frequency) */
+	byMonth?: number[];
+	/** Number of occurrences (COUNT) */
+	count?: number;
+	/** End date of recurrence (UNTIL) */
+	until?: Date | string;
+}
+
+/**
+ * Common recurrence presets for UI
+ */
+export const RECURRENCE_PRESETS = [
+	{ label: 'Does not repeat', value: null },
+	{ label: 'Daily', value: 'FREQ=DAILY' },
+	{ label: 'Weekly', value: 'FREQ=WEEKLY' },
+	{ label: 'Every weekday (Mon-Fri)', value: 'FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR' },
+	{ label: 'Monthly', value: 'FREQ=MONTHLY' },
+	{ label: 'Yearly', value: 'FREQ=YEARLY' },
+] as const;
+
+export type RecurrencePreset = (typeof RECURRENCE_PRESETS)[number];
+
+/**
+ * Weekday labels for UI
+ */
+export const WEEKDAY_LABELS: Record<Weekday, string> = {
+	MO: 'Monday',
+	TU: 'Tuesday',
+	WE: 'Wednesday',
+	TH: 'Thursday',
+	FR: 'Friday',
+	SA: 'Saturday',
+	SU: 'Sunday',
+};
+
+/**
+ * Short weekday labels for UI
+ */
+export const WEEKDAY_SHORT_LABELS: Record<Weekday, string> = {
+	MO: 'Mon',
+	TU: 'Tue',
+	WE: 'Wed',
+	TH: 'Thu',
+	FR: 'Fri',
+	SA: 'Sat',
+	SU: 'Sun',
+};
diff --git a/apps/calendar/packages/shared/src/types/reminder.ts b/apps/calendar/packages/shared/src/types/reminder.ts
new file mode 100644
index 000000000..7f88fb796
--- /dev/null
+++ b/apps/calendar/packages/shared/src/types/reminder.ts
@@ -0,0 +1,58 @@
+/**
+ * Reminder status
+ */
+export type ReminderStatus = 'pending' | 'sent' | 'failed' | 'cancelled';
+
+/**
+ * Event reminder entity
+ */
+export interface Reminder {
+	id: string;
+	eventId: string;
+	userId: string;
+
+	// Timing
+	minutesBefore: number;
+	reminderTime: Date | string;
+
+	// Notification channels
+	notifyPush: boolean;
+	notifyEmail: boolean;
+
+	// Status
+	status: ReminderStatus;
+	sentAt?: Date | string | null;
+
+	// For recurring events
+	eventInstanceDate?: Date | string | null;
+
+	createdAt: Date | string;
+}
+
+/**
+ * Data required to create a reminder
+ */
+export interface CreateReminderInput {
+	eventId: string;
+	minutesBefore: number;
+	notifyPush?: boolean;
+	notifyEmail?: boolean;
+}
+
+/**
+ * Common reminder presets (in minutes)
+ */
+export const REMINDER_PRESETS = [
+	{ label: 'At time of event', minutes: 0 },
+	{ label: '5 minutes before', minutes: 5 },
+	{ label: '10 minutes before', minutes: 10 },
+	{ label: '15 minutes before', minutes: 15 },
+	{ label: '30 minutes before', minutes: 30 },
+	{ label: '1 hour before', minutes: 60 },
+	{ label: '2 hours before', minutes: 120 },
+	{ label: '1 day before', minutes: 1440 },
+	{ label: '2 days before', minutes: 2880 },
+	{ label: '1 week before', minutes: 10080 },
+] as const;
+
+export type ReminderPreset = (typeof REMINDER_PRESETS)[number];
diff --git a/apps/calendar/packages/shared/src/types/share.ts b/apps/calendar/packages/shared/src/types/share.ts
new file mode 100644
index 000000000..56ad9ec62
--- /dev/null
+++ b/apps/calendar/packages/shared/src/types/share.ts
@@ -0,0 +1,91 @@
+/**
+ * Calendar share permission levels
+ */
+export type SharePermission = 'read' | 'write' | 'admin';
+
+/**
+ * Share invitation status
+ */
+export type ShareStatus = 'pending' | 'accepted' | 'declined';
+
+/**
+ * Calendar share entity
+ */
+export interface CalendarShare {
+	id: string;
+	calendarId: string;
+	sharedWithUserId?: string | null;
+	sharedWithEmail?: string | null;
+
+	// Permission
+	permission: SharePermission;
+
+	// Share link (for public/link sharing)
+	shareToken?: string | null;
+	shareUrl?: string | null;
+
+	// Status
+	status: ShareStatus;
+
+	// Metadata
+	invitedBy: string;
+	acceptedAt?: Date | string | null;
+	expiresAt?: Date | string | null;
+
+	createdAt: Date | string;
+	updatedAt: Date | string;
+}
+
+/**
+ * Share with calendar and user details (for display)
+ */
+export interface CalendarShareWithDetails extends CalendarShare {
+	calendar?: {
+		id: string;
+		name: string;
+		color: string;
+		userId: string;
+	};
+	invitedByUser?: {
+		id: string;
+		email: string;
+		name?: string;
+	};
+	sharedWithUser?: {
+		id: string;
+		email: string;
+		name?: string;
+	};
+}
+
+/**
+ * Data required to share a calendar
+ */
+export interface CreateShareInput {
+	calendarId: string;
+	/** Email of user to share with */
+	email?: string;
+	/** Permission level */
+	permission: SharePermission;
+	/** Create a shareable link instead of direct share */
+	createLink?: boolean;
+	/** Optional expiration date */
+	expiresAt?: Date | string;
+}
+
+/**
+ * Data for updating a share
+ */
+export interface UpdateShareInput {
+	permission?: SharePermission;
+	expiresAt?: Date | string | null;
+}
+
+/**
+ * Permission descriptions for UI
+ */
+export const PERMISSION_DESCRIPTIONS: Record<SharePermission, string> = {
+	read: 'Can view events',
+	write: 'Can view and edit events',
+	admin: 'Can manage calendar settings and shares',
+};
diff --git a/apps/calendar/packages/shared/src/types/sync.ts b/apps/calendar/packages/shared/src/types/sync.ts
new file mode 100644
index 000000000..64347df8b
--- /dev/null
+++ b/apps/calendar/packages/shared/src/types/sync.ts
@@ -0,0 +1,133 @@
+/**
+ * External calendar provider
+ */
+export type CalendarProvider = 'google' | 'apple' | 'caldav' | 'ical_url';
+
+/**
+ * Sync direction
+ */
+export type SyncDirection = 'import' | 'export' | 'both';
+
+/**
+ * Provider-specific metadata
+ */
+export interface ExternalCalendarProviderData {
+	// Google
+	googleCalendarId?: string;
+
+	// Apple
+	appleCalendarId?: string;
+
+	// CalDAV
+	caldavCalendarId?: string;
+	caldavEtag?: string;
+	caldavCtag?: string;
+
+	// iCal URL
+	icalLastModified?: string;
+	icalEtag?: string;
+}
+
+/**
+ * External calendar connection entity
+ */
+export interface ExternalCalendar {
+	id: string;
+	userId: string;
+
+	// Calendar identification
+	name: string;
+	provider: CalendarProvider;
+
+	// Connection details
+	calendarUrl: string;
+	username?: string | null;
+	// Note: password is encrypted in database, not exposed
+
+	// OAuth tokens (for Google, etc.)
+	// Note: tokens are encrypted/hidden from client
+
+	// Sync settings
+	syncEnabled: boolean;
+	syncDirection: SyncDirection;
+	syncInterval: number; // Minutes between syncs
+	lastSyncAt?: Date | string | null;
+	lastSyncError?: string | null;
+
+	// Display settings
+	color: string;
+	isVisible: boolean;
+
+	// Provider-specific metadata
+	providerData?: ExternalCalendarProviderData | null;
+
+	createdAt: Date | string;
+	updatedAt: Date | string;
+}
+
+/**
+ * Data required to connect an external calendar
+ */
+export interface ConnectExternalCalendarInput {
+	name: string;
+	provider: CalendarProvider;
+	calendarUrl: string;
+	username?: string;
+	password?: string;
+	syncDirection?: SyncDirection;
+	syncInterval?: number;
+	color?: string;
+}
+
+/**
+ * CalDAV discovery result
+ */
+export interface CalDavDiscoveryResult {
+	calendars: Array<{
+		url: string;
+		name: string;
+		color?: string;
+		description?: string;
+	}>;
+}
+
+/**
+ * Sync status for display
+ */
+export interface SyncStatus {
+	externalCalendarId: string;
+	status: 'idle' | 'syncing' | 'success' | 'error';
+	lastSyncAt?: Date | string;
+	lastError?: string;
+	eventsImported?: number;
+	eventsExported?: number;
+}
+
+/**
+ * Provider display info
+ */
+export const PROVIDER_INFO: Record<
+	CalendarProvider,
+	{ label: string; icon: string; description: string }
+> = {
+	google: {
+		label: 'Google Calendar',
+		icon: 'google',
+		description: 'Sync with your Google Calendar',
+	},
+	apple: {
+		label: 'Apple Calendar',
+		icon: 'apple',
+		description: 'Sync with iCloud Calendar',
+	},
+	caldav: {
+		label: 'CalDAV',
+		icon: 'server',
+		description: 'Connect to any CalDAV server',
+	},
+	ical_url: {
+		label: 'iCal URL',
+		icon: 'link',
+		description: 'Import from an iCal/ICS URL',
+	},
+};
diff --git a/apps/calendar/packages/shared/src/utils/date.ts b/apps/calendar/packages/shared/src/utils/date.ts
new file mode 100644
index 000000000..93bff3396
--- /dev/null
+++ b/apps/calendar/packages/shared/src/utils/date.ts
@@ -0,0 +1,242 @@
+/**
+ * Date utility functions for calendar operations
+ */
+
+/**
+ * Get the start of day for a given date
+ */
+export function startOfDay(date: Date): Date {
+	const result = new Date(date);
+	result.setHours(0, 0, 0, 0);
+	return result;
+}
+
+/**
+ * Get the end of day for a given date
+ */
+export function endOfDay(date: Date): Date {
+	const result = new Date(date);
+	result.setHours(23, 59, 59, 999);
+	return result;
+}
+
+/**
+ * Get the start of week for a given date
+ * @param date - The date
+ * @param weekStartsOn - 0 = Sunday, 1 = Monday
+ */
+export function startOfWeek(date: Date, weekStartsOn: 0 | 1 = 1): Date {
+	const result = new Date(date);
+	const day = result.getDay();
+	const diff = (day < weekStartsOn ? 7 : 0) + day - weekStartsOn;
+	result.setDate(result.getDate() - diff);
+	result.setHours(0, 0, 0, 0);
+	return result;
+}
+
+/**
+ * Get the end of week for a given date
+ * @param date - The date
+ * @param weekStartsOn - 0 = Sunday, 1 = Monday
+ */
+export function endOfWeek(date: Date, weekStartsOn: 0 | 1 = 1): Date {
+	const result = startOfWeek(date, weekStartsOn);
+	result.setDate(result.getDate() + 6);
+	result.setHours(23, 59, 59, 999);
+	return result;
+}
+
+/**
+ * Get the start of month for a given date
+ */
+export function startOfMonth(date: Date): Date {
+	const result = new Date(date);
+	result.setDate(1);
+	result.setHours(0, 0, 0, 0);
+	return result;
+}
+
+/**
+ * Get the end of month for a given date
+ */
+export function endOfMonth(date: Date): Date {
+	const result = new Date(date);
+	result.setMonth(result.getMonth() + 1);
+	result.setDate(0);
+	result.setHours(23, 59, 59, 999);
+	return result;
+}
+
+/**
+ * Get the start of year for a given date
+ */
+export function startOfYear(date: Date): Date {
+	const result = new Date(date);
+	result.setMonth(0, 1);
+	result.setHours(0, 0, 0, 0);
+	return result;
+}
+
+/**
+ * Get the end of year for a given date
+ */
+export function endOfYear(date: Date): Date {
+	const result = new Date(date);
+	result.setMonth(11, 31);
+	result.setHours(23, 59, 59, 999);
+	return result;
+}
+
+/**
+ * Add days to a date
+ */
+export function addDays(date: Date, days: number): Date {
+	const result = new Date(date);
+	result.setDate(result.getDate() + days);
+	return result;
+}
+
+/**
+ * Add weeks to a date
+ */
+export function addWeeks(date: Date, weeks: number): Date {
+	return addDays(date, weeks * 7);
+}
+
+/**
+ * Add months to a date
+ */
+export function addMonths(date: Date, months: number): Date {
+	const result = new Date(date);
+	result.setMonth(result.getMonth() + months);
+	return result;
+}
+
+/**
+ * Add years to a date
+ */
+export function addYears(date: Date, years: number): Date {
+	const result = new Date(date);
+	result.setFullYear(result.getFullYear() + years);
+	return result;
+}
+
+/**
+ * Check if two dates are on the same day
+ */
+export function isSameDay(date1: Date, date2: Date): boolean {
+	return (
+		date1.getFullYear() === date2.getFullYear() &&
+		date1.getMonth() === date2.getMonth() &&
+		date1.getDate() === date2.getDate()
+	);
+}
+
+/**
+ * Check if a date is today
+ */
+export function isToday(date: Date): boolean {
+	return isSameDay(date, new Date());
+}
+
+/**
+ * Check if a date is in the past
+ */
+export function isPast(date: Date): boolean {
+	return date.getTime() < Date.now();
+}
+
+/**
+ * Check if a date is in the future
+ */
+export function isFuture(date: Date): boolean {
+	return date.getTime() > Date.now();
+}
+
+/**
+ * Get all days in a month as an array
+ */
+export function getDaysInMonth(year: number, month: number): Date[] {
+	const days: Date[] = [];
+	const date = new Date(year, month, 1);
+	while (date.getMonth() === month) {
+		days.push(new Date(date));
+		date.setDate(date.getDate() + 1);
+	}
+	return days;
+}
+
+/**
+ * Get the number of days in a month
+ */
+export function getMonthDayCount(year: number, month: number): number {
+	return new Date(year, month + 1, 0).getDate();
+}
+
+/**
+ * Format a date range for display
+ */
+export function formatDateRange(start: Date, end: Date): string {
+	const startStr = start.toLocaleDateString();
+	const endStr = end.toLocaleDateString();
+
+	if (isSameDay(start, end)) {
+		return startStr;
+	}
+
+	return `${startStr} - ${endStr}`;
+}
+
+/**
+ * Format a time for display (HH:MM)
+ */
+export function formatTime(date: Date): string {
+	return date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
+}
+
+/**
+ * Parse an ISO date string to Date
+ */
+export function parseISODate(dateString: string | Date): Date {
+	if (dateString instanceof Date) {
+		return dateString;
+	}
+	return new Date(dateString);
+}
+
+/**
+ * Get week number of the year (ISO 8601)
+ */
+export function getWeekNumber(date: Date): number {
+	const d = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()));
+	const dayNum = d.getUTCDay() || 7;
+	d.setUTCDate(d.getUTCDate() + 4 - dayNum);
+	const yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
+	return Math.ceil(((d.getTime() - yearStart.getTime()) / 86400000 + 1) / 7);
+}
+
+/**
+ * Get an array of hours in a day (0-23)
+ */
+export function getHoursInDay(): number[] {
+	return Array.from({ length: 24 }, (_, i) => i);
+}
+
+/**
+ * Calculate event duration in minutes
+ */
+export function getEventDurationMinutes(start: Date, end: Date): number {
+	return Math.round((end.getTime() - start.getTime()) / (1000 * 60));
+}
+
+/**
+ * Check if two time ranges overlap
+ */
+export function doTimeRangesOverlap(
+	start1: Date,
+	end1: Date,
+	start2: Date,
+	end2: Date
+): boolean {
+	return start1 < end2 && end1 > start2;
+}
diff --git a/apps/calendar/packages/shared/src/utils/index.ts b/apps/calendar/packages/shared/src/utils/index.ts
new file mode 100644
index 000000000..22099d1aa
--- /dev/null
+++ b/apps/calendar/packages/shared/src/utils/index.ts
@@ -0,0 +1,3 @@
+// Calendar utilities
+export * from './date';
+export * from './recurrence';
diff --git a/apps/calendar/packages/shared/src/utils/recurrence.ts b/apps/calendar/packages/shared/src/utils/recurrence.ts
new file mode 100644
index 000000000..7623a1463
--- /dev/null
+++ b/apps/calendar/packages/shared/src/utils/recurrence.ts
@@ -0,0 +1,267 @@
+import type { RecurrencePattern, RecurrenceFrequency, Weekday } from '../types/recurrence';
+import { addDays, addWeeks, addMonths, addYears } from './date';
+
+/**
+ * Parse an RFC 5545 RRULE string to a RecurrencePattern object
+ *
+ * Example: "FREQ=WEEKLY;INTERVAL=2;BYDAY=MO,WE,FR;UNTIL=20241231T235959Z"
+ */
+export function parseRRule(rrule: string): RecurrencePattern | null {
+	if (!rrule || !rrule.startsWith('FREQ=')) {
+		return null;
+	}
+
+	const parts = rrule.split(';');
+	const pattern: RecurrencePattern = {
+		frequency: 'DAILY',
+	};
+
+	for (const part of parts) {
+		const [key, value] = part.split('=');
+
+		switch (key) {
+			case 'FREQ':
+				if (['DAILY', 'WEEKLY', 'MONTHLY', 'YEARLY'].includes(value)) {
+					pattern.frequency = value as RecurrenceFrequency;
+				}
+				break;
+
+			case 'INTERVAL':
+				pattern.interval = parseInt(value, 10);
+				break;
+
+			case 'BYDAY':
+				pattern.byDay = value.split(',') as Weekday[];
+				break;
+
+			case 'BYMONTHDAY':
+				pattern.byMonthDay = value.split(',').map((d) => parseInt(d, 10));
+				break;
+
+			case 'BYMONTH':
+				pattern.byMonth = value.split(',').map((m) => parseInt(m, 10));
+				break;
+
+			case 'COUNT':
+				pattern.count = parseInt(value, 10);
+				break;
+
+			case 'UNTIL':
+				// Parse UNTIL date (format: YYYYMMDD or YYYYMMDDTHHMMSSZ)
+				const year = parseInt(value.substring(0, 4), 10);
+				const month = parseInt(value.substring(4, 6), 10) - 1;
+				const day = parseInt(value.substring(6, 8), 10);
+				pattern.until = new Date(year, month, day, 23, 59, 59);
+				break;
+		}
+	}
+
+	return pattern;
+}
+
+/**
+ * Format a RecurrencePattern object to an RFC 5545 RRULE string
+ */
+export function formatRRule(pattern: RecurrencePattern): string {
+	const parts: string[] = [`FREQ=${pattern.frequency}`];
+
+	if (pattern.interval && pattern.interval > 1) {
+		parts.push(`INTERVAL=${pattern.interval}`);
+	}
+
+	if (pattern.byDay && pattern.byDay.length > 0) {
+		parts.push(`BYDAY=${pattern.byDay.join(',')}`);
+	}
+
+	if (pattern.byMonthDay && pattern.byMonthDay.length > 0) {
+		parts.push(`BYMONTHDAY=${pattern.byMonthDay.join(',')}`);
+	}
+
+	if (pattern.byMonth && pattern.byMonth.length > 0) {
+		parts.push(`BYMONTH=${pattern.byMonth.join(',')}`);
+	}
+
+	if (pattern.count) {
+		parts.push(`COUNT=${pattern.count}`);
+	}
+
+	if (pattern.until) {
+		const date = new Date(pattern.until);
+		const until = `${date.getFullYear()}${String(date.getMonth() + 1).padStart(2, '0')}${String(date.getDate()).padStart(2, '0')}T235959Z`;
+		parts.push(`UNTIL=${until}`);
+	}
+
+	return parts.join(';');
+}
+
+/**
+ * Get human-readable description of a recurrence pattern
+ */
+export function describeRecurrence(pattern: RecurrencePattern | null): string {
+	if (!pattern) {
+		return 'Does not repeat';
+	}
+
+	const interval = pattern.interval || 1;
+
+	switch (pattern.frequency) {
+		case 'DAILY':
+			if (interval === 1) return 'Daily';
+			return `Every ${interval} days`;
+
+		case 'WEEKLY':
+			if (pattern.byDay && pattern.byDay.length > 0) {
+				if (pattern.byDay.length === 5 && !pattern.byDay.includes('SA') && !pattern.byDay.includes('SU')) {
+					return interval === 1 ? 'Every weekday' : `Every ${interval} weeks on weekdays`;
+				}
+				const days = pattern.byDay.map(dayToLabel).join(', ');
+				return interval === 1 ? `Weekly on ${days}` : `Every ${interval} weeks on ${days}`;
+			}
+			return interval === 1 ? 'Weekly' : `Every ${interval} weeks`;
+
+		case 'MONTHLY':
+			if (pattern.byMonthDay && pattern.byMonthDay.length > 0) {
+				const days = pattern.byMonthDay.join(', ');
+				return interval === 1 ? `Monthly on day ${days}` : `Every ${interval} months on day ${days}`;
+			}
+			return interval === 1 ? 'Monthly' : `Every ${interval} months`;
+
+		case 'YEARLY':
+			return interval === 1 ? 'Yearly' : `Every ${interval} years`;
+
+		default:
+			return 'Custom repeat';
+	}
+}
+
+/**
+ * Convert weekday code to label
+ */
+function dayToLabel(day: Weekday): string {
+	const labels: Record<Weekday, string> = {
+		MO: 'Mon',
+		TU: 'Tue',
+		WE: 'Wed',
+		TH: 'Thu',
+		FR: 'Fri',
+		SA: 'Sat',
+		SU: 'Sun',
+	};
+	return labels[day];
+}
+
+/**
+ * Convert JavaScript day (0-6) to Weekday
+ */
+export function jsDateToWeekday(jsDay: number): Weekday {
+	const weekdays: Weekday[] = ['SU', 'MO', 'TU', 'WE', 'TH', 'FR', 'SA'];
+	return weekdays[jsDay];
+}
+
+/**
+ * Convert Weekday to JavaScript day (0-6)
+ */
+export function weekdayToJsDate(weekday: Weekday): number {
+	const weekdays: Weekday[] = ['SU', 'MO', 'TU', 'WE', 'TH', 'FR', 'SA'];
+	return weekdays.indexOf(weekday);
+}
+
+/**
+ * Generate occurrences of a recurring event within a date range
+ *
+ * @param startDate - The start date of the first occurrence
+ * @param pattern - The recurrence pattern
+ * @param rangeStart - Start of the date range to generate occurrences for
+ * @param rangeEnd - End of the date range
+ * @param exceptions - Dates to exclude (as ISO strings)
+ * @param maxOccurrences - Maximum number of occurrences to generate
+ */
+export function generateOccurrences(
+	startDate: Date,
+	pattern: RecurrencePattern,
+	rangeStart: Date,
+	rangeEnd: Date,
+	exceptions: string[] = [],
+	maxOccurrences: number = 365
+): Date[] {
+	const occurrences: Date[] = [];
+	const exceptionsSet = new Set(exceptions);
+	const interval = pattern.interval || 1;
+
+	let currentDate = new Date(startDate);
+	let count = 0;
+
+	// Get the maximum end date (either pattern.until or rangeEnd)
+	const maxDate = pattern.until
+		? new Date(Math.min(new Date(pattern.until).getTime(), rangeEnd.getTime()))
+		: rangeEnd;
+
+	while (currentDate <= maxDate && count < maxOccurrences) {
+		// Check if we've exceeded COUNT
+		if (pattern.count && occurrences.length >= pattern.count) {
+			break;
+		}
+
+		// Check if this date matches the pattern
+		if (matchesPattern(currentDate, pattern)) {
+			// Check if date is in range and not in exceptions
+			if (currentDate >= rangeStart && !exceptionsSet.has(currentDate.toISOString().split('T')[0])) {
+				occurrences.push(new Date(currentDate));
+			}
+		}
+
+		// Move to next potential occurrence
+		currentDate = getNextOccurrence(currentDate, pattern.frequency, interval);
+		count++;
+	}
+
+	return occurrences;
+}
+
+/**
+ * Check if a date matches the recurrence pattern constraints
+ */
+function matchesPattern(date: Date, pattern: RecurrencePattern): boolean {
+	// Check BYDAY
+	if (pattern.byDay && pattern.byDay.length > 0) {
+		const dayOfWeek = jsDateToWeekday(date.getDay());
+		if (!pattern.byDay.includes(dayOfWeek)) {
+			return false;
+		}
+	}
+
+	// Check BYMONTHDAY
+	if (pattern.byMonthDay && pattern.byMonthDay.length > 0) {
+		if (!pattern.byMonthDay.includes(date.getDate())) {
+			return false;
+		}
+	}
+
+	// Check BYMONTH
+	if (pattern.byMonth && pattern.byMonth.length > 0) {
+		if (!pattern.byMonth.includes(date.getMonth() + 1)) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+/**
+ * Get the next occurrence date based on frequency
+ */
+function getNextOccurrence(date: Date, frequency: RecurrenceFrequency, interval: number): Date {
+	switch (frequency) {
+		case 'DAILY':
+			return addDays(date, interval);
+		case 'WEEKLY':
+			// For weekly, always move by 1 day to check each day of the week
+			return addDays(date, 1);
+		case 'MONTHLY':
+			return addMonths(date, interval);
+		case 'YEARLY':
+			return addYears(date, interval);
+		default:
+			return addDays(date, 1);
+	}
+}
diff --git a/apps/calendar/packages/shared/tsconfig.json b/apps/calendar/packages/shared/tsconfig.json
new file mode 100644
index 000000000..496f1abc8
--- /dev/null
+++ b/apps/calendar/packages/shared/tsconfig.json
@@ -0,0 +1,20 @@
+{
+	"compilerOptions": {
+		"target": "ES2022",
+		"module": "ESNext",
+		"lib": ["ES2022"],
+		"moduleResolution": "bundler",
+		"strict": true,
+		"esModuleInterop": true,
+		"skipLibCheck": true,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"isolatedModules": true,
+		"declaration": true,
+		"declarationMap": true,
+		"outDir": "./dist",
+		"rootDir": "./src"
+	},
+	"include": ["src/**/*"],
+	"exclude": ["node_modules", "dist"]
+}