/* ==========================================================================
   Design Tokens — CSS Custom Properties
   Source of truth: frontend/tailwind.config.js
   ========================================================================== */

:root {
  /* Primary (blue-purple) */
  --primary-50: #f0f5ff;
  --primary-100: #e0ebff;
  --primary-200: #c7d9ff;
  --primary-300: #a4bfff;
  --primary-400: #7a9aff;
  --primary-500: #5271ff;
  --primary-600: #3b4ff5;
  --primary-700: #2f3de0;
  --primary-800: #2833b5;
  --primary-900: #26308e;
  --primary-950: #1a1f56;

  /* Surface (neutral grays) */
  --surface-50: #fafafa;
  --surface-100: #f4f4f5;
  --surface-200: #e4e4e7;
  --surface-300: #d4d4d8;
  --surface-400: #a1a1aa;
  --surface-500: #71717a;
  --surface-600: #52525b;
  --surface-700: #3f3f46;
  --surface-800: #27272a;
  --surface-900: #18181b;
  --surface-950: #09090b;

  /* Semantic */
  --success-50: #ecfdf5;
  --success-500: #10b981;
  --success-700: #047857;
  --warning-50: #fffbeb;
  --warning-500: #f59e0b;
  --warning-700: #b45309;
  --error-50: #fef2f2;
  --error-500: #ef4444;
  --error-700: #b91c1c;

  /* Typography */
  --font-sans: 'Inter var', 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.45, 0, 0.55, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 500ms;
  --duration-slower: 800ms;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --nav-height: 4rem;

  /* =======================================================================
     Themeable Slots — Per-site theme.css overrides these
     ======================================================================= */
  --bg-primary: var(--surface-50);
  --bg-secondary: var(--surface-100);
  --bg-card: #ffffff;
  --text-primary: var(--surface-900);
  --text-secondary: var(--surface-500);
  --text-muted: var(--surface-400);
  --accent: var(--primary-600);
  --accent-hover: var(--primary-700);
  --accent-alt: var(--primary-500);
  --border-color: var(--surface-200);
  --card-border: var(--surface-200);
  --nav-bg: rgba(255, 255, 255, 0.85);
  --nav-border: var(--surface-200);
}