/* Base Styles & Theme Variables */
@tailwind base;
@tailwind components;
@tailwind utilities;

@layer base {
  :root {
    /* Default Colors - Can be overridden per app */
    --color-primary: 102 126 234; /* #667eea */
    --color-primary-dark: 118 75 162; /* #764ba2 */
    --color-secondary: 236 72 153; /* #ec4899 */

    /* Semantic Colors - Light Mode */
    --color-background: 255 255 255;
    --color-surface: 245 245 245;
    --color-surface-elevated: 255 255 255;

    --color-text-primary: 51 51 51;
    --color-text-secondary: 102 102 102;
    --color-text-tertiary: 153 153 153;

    --color-border: 224 224 224;
    --color-border-hover: 189 189 189;

    /* Status Colors */
    --color-success: 34 197 94;
    --color-warning: 234 179 8;
    --color-error: 239 68 68;
    --color-info: 59 130 246;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* 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;
  }

  /* Dark Mode */
  [data-theme="dark"] {
    --color-background: 17 24 39; /* gray-900 */
    --color-surface: 31 41 55; /* gray-800 */
    --color-surface-elevated: 55 65 81; /* gray-700 */

    --color-text-primary: 243 244 246; /* gray-100 */
    --color-text-secondary: 209 213 219; /* gray-300 */
    --color-text-tertiary: 156 163 175; /* gray-400 */

    --color-border: 55 65 81; /* gray-700 */
    --color-border-hover: 75 85 99; /* gray-600 */

    /* Adjust shadows for dark mode */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  }

  /* Apply theme colors to base elements */
  body {
    background-color: rgb(var(--color-background));
    color: rgb(var(--color-text-primary));
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    transition: background-color var(--transition-base), color var(--transition-base);
  }

  * {
    box-sizing: border-box;
  }
}

/* Utility Classes */
@layer components {
  /* Gradient backgrounds */
  .gradient-primary {
    background: linear-gradient(135deg, rgb(var(--color-primary)) 0%, rgb(var(--color-primary-dark)) 100%);
  }

  /* Glass effect */
  .glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
  }

  [data-theme="dark"] .glass {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  /* Card styles */
  .card {
    background-color: rgb(var(--color-surface-elevated));
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid rgb(var(--color-border));
    transition: transform var(--transition-base), box-shadow var(--transition-base);
  }

  .card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
  }

  /* 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: rgb(var(--color-primary));
    color: white;
  }

  .btn-primary:hover {
    background: rgb(var(--color-primary-dark));
  }

  /* Input styles */
  .input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid rgb(var(--color-border));
    border-radius: var(--radius-md);
    background-color: rgb(var(--color-background));
    color: rgb(var(--color-text-primary));
    transition: border-color var(--transition-fast);
  }

  .input:focus {
    outline: none;
    border-color: rgb(var(--color-primary));
  }
}