/* Rush EM — Design Tokens
 * Dark theme. Swap --font-display / --font-body to 'Calibre' once Rush licenses
 * the brand webfont; everything else stays. */

:root {
  /* ---- Surfaces (near-black ascending to elevated card) ---- */
  --color-ink:              #0a0d0b;
  --color-ink-rgb:          10, 13, 11;
  --color-surface-1s:       #121815;
  --color-surface-2:        #1a221d;
  --color-surface-3:        #232c26;
  --color-hairline:         #2a342d;
  --color-hairline-strong:  #3a463d;

  /* ---- Text ---- */
  --color-bone:             #f3efe8;
  --color-bone-dim:         #c9c5be;
  --color-bone-muted:       #8d8a84;

  /* ---- Brand greens (re-tuned for dark UI) ---- */
  --color-green:            #3fb27a;
  --color-green-soft:       #6fd49d;
  --color-green-deep:       #006332;
  --color-green-glow:       rgba(63, 178, 122, 0.28);

  /* ---- Warm accents — used sparingly ---- */
  --color-ember:            #f26c52;
  --color-rush-red:         #ab2328;
  --color-blue:             #4ea7c4;

  /* ---- Semantic ---- */
  --color-link:             var(--color-green-soft);
  --color-link-hover:       var(--color-bone);
  --color-focus:            var(--color-green);

  /* ---- Typography ---- */
  --font-display: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body:    'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:    ui-monospace, 'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, monospace;
  --font-serif:   Georgia, 'Times New Roman', serif;

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

  /* Fluid type scale via clamp(min, vw-based, max) */
  --fs-display:   clamp(3rem, 6vw + 1rem, 6.5rem);
  --fs-h1:        clamp(2.25rem, 3vw + 1rem, 3.75rem);
  --fs-h2:        clamp(1.75rem, 1.6vw + 1rem, 2.5rem);
  --fs-h3:        clamp(1.375rem, 0.8vw + 1rem, 1.75rem);
  --fs-h4:        1.125rem;
  --fs-body:      1.0625rem;
  --fs-small:     0.9375rem;
  --fs-meta:      0.75rem;

  --lh-tight:     1.05;
  --lh-snug:      1.25;
  --lh-body:      1.6;

  --tracking-tight:  -0.02em;
  --tracking-meta:    0.14em;

  /* ---- Spacing scale ---- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --space-8: 6rem;
  --space-9: 9rem;

  /* ---- Radii ---- */
  --radius-xs:    2px;
  --radius-sm:    4px;
  --radius-md:    8px;
  --radius-lg:    16px;
  --radius-pill:  999px;

  /* ---- Motion ---- */
  --ease-out:     cubic-bezier(0.2, 0.8, 0.2, 1);
  --ease-inout:   cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast:     140ms;
  --dur-base:     240ms;
  --dur-slow:     480ms;

  /* ---- Shadows (dark UI: subtle, never grey ramps) ---- */
  --shadow-1:     0 1px 0 rgba(255,255,255,0.03) inset, 0 2px 6px rgba(0,0,0,0.5);
  --shadow-2:     0 1px 0 rgba(255,255,255,0.04) inset, 0 8px 24px rgba(0,0,0,0.55);
  --shadow-3:     0 1px 0 rgba(255,255,255,0.05) inset, 0 24px 64px rgba(0,0,0,0.6);
  --glow-green:   0 0 0 1px var(--color-green) inset, 0 0 24px var(--color-green-glow);

  /* ---- Layout ---- */
  --container-narrow:  56ch;
  --container-text:    72ch;
  --container-wide:    1200px;
  --container-bleed:   100%;
  --gutter-x:          clamp(1rem, 4vw, 3rem);
  --header-h:          72px;

  /* ---- Focus ---- */
  --focus-ring: 0 0 0 2px var(--color-ink), 0 0 0 4px var(--color-focus);
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --dur-fast: 0ms;
    --dur-base: 0ms;
    --dur-slow: 0ms;
  }
}