:root {
  /* ─── Color Palette ─────────────────────────────── */
  --c-midnight-900: #05030a;
  --c-midnight-800: #0a0612;
  --c-midnight-700: #120b22;
  --c-midnight-600: #1a1033;
  --c-midnight-500: #241548;
  --c-purple-700: #2d1b5e;
  --c-purple-600: #3d2478;
  --c-purple-500: #5533a8;
  --c-purple-400: #7048c9;
  --c-gold-600: #b8860b;
  --c-gold-500: #d4a017;
  --c-gold-400: #f0c040;
  --c-gold-300: #ffd966;
  --c-gold-200: #ffeaa0;
  --c-cream: #fdf6e3;
  --c-ink: #1a1033;

  --c-king-500: #d4a017;
  --c-king-400: #f0c040;
  --c-king-300: #ffeaa0;
  --c-queen-500: #c2185b;
  --c-queen-400: #e91e63;
  --c-queen-300: #f8bbd0;
  --c-detective-500: #1565c0;
  --c-detective-400: #2196f3;
  --c-detective-300: #bbdefb;
  --c-thief-500: #b71c1c;
  --c-thief-400: #e53935;
  --c-thief-300: #ffcdd2;

  --c-success: #43a047;
  --c-error: #e53935;
  --c-warning: #fb8c00;
  --c-text: #f5f0ff;
  --c-text-muted: #b8a8d9;
  --c-text-dim: #7a6b9e;

  /* ─── Typography ────────────────────────────────── */
  --font-display: 'Georgia', 'Times New Roman', serif;
  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  --fs-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --fs-sm: clamp(0.8rem, 0.75rem + 0.3vw, 0.9rem);
  --fs-base: clamp(0.95rem, 0.9rem + 0.3vw, 1.05rem);
  --fs-md: clamp(1.1rem, 1rem + 0.5vw, 1.3rem);
  --fs-lg: clamp(1.4rem, 1.2rem + 1vw, 1.8rem);
  --fs-xl: clamp(1.8rem, 1.5rem + 1.5vw, 2.5rem);
  --fs-2xl: clamp(2.2rem, 1.8rem + 2vw, 3.2rem);
  --fs-3xl: clamp(2.8rem, 2rem + 3vw, 4.5rem);

  --lh-tight: 1.15;
  --lh-snug: 1.3;
  --lh-normal: 1.55;
  --lh-relaxed: 1.7;

  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  --ls-tight: -0.02em;
  --ls-normal: 0;
  --ls-wide: 0.05em;
  --ls-wider: 0.12em;
  --ls-widest: 0.2em;

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

  /* ─── Radii ─────────────────────────────────────── */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 18px;
  --r-xl: 28px;
  --r-full: 9999px;

  /* ─── Shadows & Elevation ───────────────────────── */
  --sh-sm: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --sh-md: 0 4px 12px rgba(0,0,0,0.35), 0 2px 4px rgba(0,0,0,0.2);
  --sh-lg: 0 10px 30px rgba(0,0,0,0.45), 0 4px 10px rgba(0,0,0,0.25);
  --sh-xl: 0 20px 50px rgba(0,0,0,0.55), 0 8px 20px rgba(0,0,0,0.3);
  --sh-gold: 0 0 20px rgba(212,160,23,0.35), 0 0 40px rgba(212,160,23,0.15);
  --sh-inner: inset 0 1px 0 rgba(255,255,255,0.08);
  --sh-focus: 0 0 0 3px var(--c-gold-400), 0 0 0 5px rgba(212,160,23,0.25);

  /* ─── Animation Timing ──────────────────────────── */
  --dur-instant: 80ms;
  --dur-fast: 150ms;
  --dur-normal: 280ms;
  --dur-slow: 450ms;
  --dur-slower: 700ms;
  --dur-cinematic: 1200ms;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in: cubic-bezier(0.64, 0, 0.78, 0);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-anticipate: cubic-bezier(0.36, 0, 0.66, -0.56);

  /* ─── Layout ────────────────────────────────────── */
  --max-w-app: 480px;
  --max-w-wide: 960px;
  --header-h: 60px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);

  /* ─── Z-index Scale ─────────────────────────────── */
  --z-base: 1;
  --z-above: 10;
  --z-overlay: 100;
  --z-modal: 200;
  --z-notification: 300;
  --z-top: 400;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --dur-instant: 0ms;
    --dur-fast: 0ms;
    --dur-normal: 0ms;
    --dur-slow: 0ms;
    --dur-slower: 0ms;
    --dur-cinematic: 0ms;
  }
}