/* =========================================================
   ATOM Experience System v4.5 — Design Tokens
   Dark-only · Single source of truth
   Canonical palette per ATOM v4.5 prompt spec.
   Import first:  <link rel="stylesheet" href="css/atom-tokens.css">
   ========================================================= */

:root {
  /* ---- Type families (v4.5: Inter UI/body, JetBrains Mono specs/data) ---- */
  --atom-font-display: 'Inter', system-ui, -apple-system, sans-serif;
  --atom-font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --atom-font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', monospace;

  /* ---- Fluid type scale ---- */
  --atom-text-xs: clamp(0.75rem, 0.7rem + 0.2vw, 0.8125rem);
  --atom-text-sm: clamp(0.8125rem, 0.78rem + 0.3vw, 0.9375rem);
  --atom-text-base: clamp(0.9375rem, 0.9rem + 0.25vw, 1.0625rem);
  --atom-text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.45rem);
  --atom-text-xl: clamp(1.4rem, 1.1rem + 1.1vw, 2.1rem);
  --atom-text-2xl: clamp(1.9rem, 1.3rem + 2.6vw, 3.4rem);
  --atom-text-3xl: clamp(2.6rem, 1.4rem + 5vw, 6rem);
  --atom-text-hero: clamp(3rem, 1.2rem + 8vw, 8.5rem);

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

  /* ---- Radius ---- */
  --atom-radius-sm: 0.375rem; --atom-radius-md: 0.625rem; --atom-radius-lg: 0.875rem;
  --atom-radius-xl: 1.25rem;  --atom-radius-2xl: 1.75rem; --atom-radius-full: 9999px;

  /* ---- Surfaces: canonical v4.5 black field + graphite ---- */
  --atom-bg: #050708;
  --atom-surface: #0B0F11;
  --atom-surface-2: #11171A;
  --atom-surface-3: #171F23;
  --atom-surface-4: #1E282D;
  --atom-border: rgba(255,255,255,0.07);
  --atom-border-bright: rgba(45,212,212,0.28);
  --atom-divider: rgba(255,255,255,0.05);

  /* ---- Text ---- */
  --atom-text-color: #F2F7F8;
  --atom-text-muted: #9FB0B5;
  --atom-text-faint: #677a80;
  --atom-text-inverse: #04100f;

  /* ---- Primary: ATOM Cyan (canonical v4.5) ---- */
  --atom-cyan: #2DD4D4;
  --atom-cyan-bright: #5BD9DA;
  --atom-cyan-dim: #1a9a9a;
  --atom-cyan-glow: rgba(45,212,212,0.16);
  --atom-cyan-glow-strong: rgba(45,212,212,0.40);

  /* ---- Semantic (restrained) ---- */
  --atom-success: #2DD4D4;
  --atom-warning: #f5c842;
  --atom-danger:  #ff7b6b;

  /* ---- Elevation ---- */
  --atom-shadow-sm: 0 1px 3px rgba(0,0,0,0.5);
  --atom-shadow-md: 0 6px 22px rgba(0,0,0,0.55);
  --atom-shadow-lg: 0 18px 50px rgba(0,0,0,0.65);
  --atom-shadow-xl: 0 32px 80px rgba(0,0,0,0.75);
  --atom-glow: 0 0 48px var(--atom-cyan-glow);
  --atom-glow-strong: 0 0 60px var(--atom-cyan-glow-strong);

  /* ---- Motion ---- */
  --atom-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --atom-ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --atom-dur-fast: 140ms;
  --atom-dur-base: 240ms;
  --atom-dur-slow: 520ms;
  --atom-transition: var(--atom-dur-base) var(--atom-ease);

  /* ---- Layout ---- */
  --atom-content: 1180px;
  --atom-content-wide: 1440px;
  --atom-nav-h: 68px;
  color-scheme: dark;
}

@media (prefers-reduced-motion: reduce) {
  :root { --atom-dur-fast: 1ms; --atom-dur-base: 1ms; --atom-dur-slow: 1ms; }
}