diff --git a/apps/web/src/routes/cards/[id]/edit/+page.svelte b/apps/web/src/routes/cards/[id]/edit/+page.svelte
new file mode 100644
index 0000000..ea10954
--- /dev/null
+++ b/apps/web/src/routes/cards/[id]/edit/+page.svelte
@@ -0,0 +1,236 @@
+<script lang="ts">
+	import { onMount } from 'svelte';
+	import { goto } from '$app/navigation';
+	import { page } from '$app/state';
+	import {
+		extractClusterIds,
+		renderClozePrompt,
+		type Card,
+		type CardType,
+	} from '@cards/domain';
+	import { getCard, updateCard, deleteCard } from '$lib/api/cards.ts';
+	import { devUser } from '$lib/auth/dev-stub.svelte.ts';
+	import { renderMarkdown } from '$lib/markdown.ts';
+	import { toasts } from '$lib/stores/toasts.svelte.ts';
+
+	let card = $state<Card | null>(null);
+	let cardType = $state<CardType>('basic');
+	let front = $state('');
+	let back = $state('');
+	let text = $state('');
+	let extra = $state('');
+	let loading = $state(true);
+	let saving = $state(false);
+	let error = $state<string | null>(null);
+
+	const cardId = $derived(page.params.id ?? '');
+
+	const frontHtml = $derived(renderMarkdown(front));
+	const backHtml = $derived(renderMarkdown(back));
+	const clusterIds = $derived(extractClusterIds(text));
+	const clozePreviewHtml = $derived.by(() => {
+		const firstCluster = clusterIds[0];
+		if (firstCluster === undefined) return '';
+		return renderMarkdown(renderClozePrompt(text, firstCluster));
+	});
+
+	onMount(async () => {
+		if (!devUser.id) {
+			goto('/');
+			return;
+		}
+		try {
+			const c = await getCard(cardId);
+			card = c;
+			cardType = c.type;
+			const fields = c.fields as Record<string, string>;
+			if (c.type === 'cloze') {
+				text = fields.text ?? '';
+				extra = fields.extra ?? '';
+			} else {
+				front = fields.front ?? '';
+				back = fields.back ?? '';
+			}
+		} catch (e) {
+			error = (e as Error).message;
+		} finally {
+			loading = false;
+		}
+	});
+
+	const canSave = $derived.by(() => {
+		if (saving) return false;
+		if (cardType === 'cloze') {
+			return text.trim().length > 0 && clusterIds.length > 0;
+		}
+		return front.trim().length > 0 && back.trim().length > 0;
+	});
+
+	async function onSubmit(e: SubmitEvent) {
+		e.preventDefault();
+		if (!card || !canSave) return;
+		saving = true;
+		try {
+			const fields: Record<string, string> =
+				cardType === 'cloze'
+					? extra.trim()
+						? { text: text.trim(), extra: extra.trim() }
+						: { text: text.trim() }
+					: { front: front.trim(), back: back.trim() };
+			const updated = await updateCard(card.id, { fields });
+			toasts.success('Karte aktualisiert');
+			goto(`/decks/${updated.deck_id}`);
+		} catch (e) {
+			toasts.error(`Speichern fehlgeschlagen: ${(e as Error).message}`);
+			saving = false;
+		}
+	}
+
+	async function onDelete() {
+		if (!card) return;
+		if (!confirm('Karte wirklich löschen? Reviews werden mit gelöscht.')) return;
+		try {
+			await deleteCard(card.id);
+			toasts.success('Karte gelöscht');
+			goto(`/decks/${card.deck_id}`);
+		} catch (e) {
+			toasts.error(`Löschen fehlgeschlagen: ${(e as Error).message}`);
+		}
+	}
+</script>
+
+<svelte:head>
+	<title>Karte bearbeiten · Cards</title>
+</svelte:head>
+
+<div class="mx-auto max-w-3xl px-4 py-6">
+	{#if loading}
+		<p class="text-[var(--color-muted)]">Lade…</p>
+	{:else if error}
+		<p class="text-[var(--color-danger)]">Fehler: {error}</p>
+	{:else if card}
+		<a
+			href="/decks/{card.deck_id}"
+			class="text-sm text-[var(--color-muted)] hover:text-[var(--color-fg)]">← Zurück zum Deck</a
+		>
+		<div class="mt-2 flex items-baseline justify-between gap-3">
+			<h1 class="text-2xl font-semibold">Karte bearbeiten</h1>
+			<span class="rounded bg-[var(--color-border)] px-2 py-0.5 text-xs text-[var(--color-muted)]">
+				{cardType}
+			</span>
+		</div>
+		<p class="mt-1 text-xs text-[var(--color-muted)]">
+			Der Card-Type kann nicht geändert werden — die Reviews-Tabelle hängt am Type.
+		</p>
+
+		<form class="mt-6 space-y-5" onsubmit={onSubmit}>
+			{#if cardType === 'cloze'}
+				<div>
+					<label class="block">
+						<span class="text-sm font-medium">Text mit Lücken (Markdown)</span>
+						<textarea
+							bind:value={text}
+							required
+							rows="6"
+							placeholder="Die Hauptstadt von {'{{c1::Frankreich}}'} ist {'{{c2::Paris}}'}."
+							class="mt-1 block w-full rounded border bg-[var(--color-card)] border-[var(--color-border)] px-3 py-2 font-mono text-sm"
+						></textarea>
+					</label>
+					<p class="mt-1 text-xs text-[var(--color-muted)]">
+						<code>{'{{c1::Antwort}}'}</code> definiert eine Lücke. Pro Cluster-ID
+						(<code>c1</code>, <code>c2</code>, …) entsteht ein eigenes Review.
+					</p>
+					{#if text.trim() && clusterIds.length === 0}
+						<p class="mt-1 text-xs text-[var(--color-danger)]">
+							Mindestens ein <code>{'{{cN::…}}'}</code>-Cluster wird gebraucht.
+						</p>
+					{:else if clusterIds.length > 0}
+						<p class="mt-1 text-xs text-[var(--color-muted)]">
+							{clusterIds.length} Cluster erkannt: c{clusterIds.join(', c')} → {clusterIds.length}
+							Reviews.
+						</p>
+					{/if}
+				</div>
+
+				{#if clozePreviewHtml}
+					<div class="rounded border border-[var(--color-border)] bg-[var(--color-card)] p-3 text-sm">
+						<div class="mb-1 text-xs uppercase text-[var(--color-muted)]">
+							Vorschau (c{clusterIds[0]} maskiert)
+						</div>
+						<div class="prose prose-sm max-w-none">{@html clozePreviewHtml}</div>
+					</div>
+				{/if}
+
+				<label class="block">
+					<span class="text-sm font-medium">Extra (optional)</span>
+					<textarea
+						bind:value={extra}
+						rows="3"
+						placeholder="Zusätzlicher Kontext, wird unter der Antwort gezeigt."
+						class="mt-1 block w-full rounded border bg-[var(--color-card)] border-[var(--color-border)] px-3 py-2 font-mono text-sm"
+					></textarea>
+				</label>
+			{:else}
+				<div class="grid grid-cols-1 gap-4 sm:grid-cols-2">
+					<div>
+						<label class="block">
+							<span class="text-sm font-medium">Vorderseite (Markdown)</span>
+							<textarea
+								bind:value={front}
+								required
+								rows="8"
+								class="mt-1 block w-full rounded border bg-[var(--color-card)] border-[var(--color-border)] px-3 py-2 font-mono text-sm"
+							></textarea>
+						</label>
+						{#if front.trim()}
+							<div class="mt-2 rounded border border-[var(--color-border)] bg-[var(--color-card)] p-3 text-sm">
+								<div class="mb-1 text-xs uppercase text-[var(--color-muted)]">Vorschau</div>
+								<div class="prose prose-sm max-w-none">{@html frontHtml}</div>
+							</div>
+						{/if}
+					</div>
+					<div>
+						<label class="block">
+							<span class="text-sm font-medium">Rückseite (Markdown)</span>
+							<textarea
+								bind:value={back}
+								required
+								rows="8"
+								class="mt-1 block w-full rounded border bg-[var(--color-card)] border-[var(--color-border)] px-3 py-2 font-mono text-sm"
+							></textarea>
+						</label>
+						{#if back.trim()}
+							<div class="mt-2 rounded border border-[var(--color-border)] bg-[var(--color-card)] p-3 text-sm">
+								<div class="mb-1 text-xs uppercase text-[var(--color-muted)]">Vorschau</div>
+								<div class="prose prose-sm max-w-none">{@html backHtml}</div>
+							</div>
+						{/if}
+					</div>
+				</div>
+			{/if}
+
+			<div class="flex items-center justify-between gap-3">
+				<div class="flex items-center gap-3">
+					<button
+						type="submit"
+						disabled={!canSave}
+						class="rounded bg-[var(--color-primary)] px-4 py-2 text-sm text-[var(--color-primary-fg)] disabled:opacity-50"
+					>
+						{saving ? 'Speichere…' : 'Speichern'}
+					</button>
+					<a
+						href="/decks/{card.deck_id}"
+						class="text-sm text-[var(--color-muted)] hover:text-[var(--color-fg)]">Abbrechen</a
+					>
+				</div>
+				<button
+					type="button"
+					onclick={onDelete}
+					class="text-sm text-[var(--color-muted)] hover:text-[var(--color-danger)]"
+				>
+					Löschen
+				</button>
+			</div>
+		</form>
+	{/if}
+</div>
diff --git a/apps/web/src/routes/decks/[id]/+page.svelte b/apps/web/src/routes/decks/[id]/+page.svelte
index 2ba9a8f..e2feb20 100644
--- a/apps/web/src/routes/decks/[id]/+page.svelte
+++ b/apps/web/src/routes/decks/[id]/+page.svelte
@@ -121,17 +121,24 @@
 		<ul class="mt-6 divide-y divide-[var(--color-border)] rounded-lg border border-[var(--color-border)] bg-[var(--color-card)]">
 			{#each cards as card (card.id)}
 				<li class="group flex items-start justify-between gap-4 px-4 py-3">
-					<div class="min-w-0 flex-1">
+					<a
+						href="/cards/{card.id}/edit"
+						class="min-w-0 flex-1 hover:text-[var(--color-primary)]"
+					>
 						<div class="flex items-center gap-2">
 							<span
 								class="rounded bg-[var(--color-border)] px-2 py-0.5 text-xs text-[var(--color-muted)]"
 							>{card.type}</span>
 						</div>
 						<p class="mt-1 truncate text-sm">
-							<span class="font-medium">{card.fields.front ?? '(leer)'}</span>
-							<span class="text-[var(--color-muted)]"> → {card.fields.back ?? '(leer)'}</span>
+							{#if card.type === 'cloze'}
+								<span class="font-medium">{card.fields.text ?? '(leer)'}</span>
+							{:else}
+								<span class="font-medium">{card.fields.front ?? '(leer)'}</span>
+								<span class="text-[var(--color-muted)]"> → {card.fields.back ?? '(leer)'}</span>
+							{/if}
 						</p>
-					</div>
+					</a>
 					<button
 						class="opacity-0 group-hover:opacity-100 text-sm text-[var(--color-muted)] hover:text-[var(--color-danger)]"
 						onclick={() => onDeleteCard(card.id)}