/* ============================================================
   Design tokens - single source of truth. Mood: Warm Editorial (light).
   Rules: neutrals + ONE accent (willow green); secondary accent max once
   per page; max 3 font families; components read only from these variables.
   ============================================================ */

html { scrollbar-gutter: stable; } /* avoids layout shift when content becomes scrollable */

:root {
  --hue: 80; /* warm cream/brown family shared by every surface and the ink */

  /* Surface ladder: light theme, so raise/elev separate via tint + shadow */
  --surface-base:  oklch(97% 0.015 var(--hue));
  --surface-raise: oklch(99% 0.008 var(--hue));
  --surface-elev:  oklch(94% 0.020 var(--hue));
  --surface-ink:   oklch(22% 0.025 var(--hue)); /* dark band for contrast rhythm */

  /* Ink: one color, four alphas */
  --ink-primary: oklch(22% 0.025 var(--hue));
  --ink-soft:    oklch(22% 0.025 var(--hue) / 0.80);
  --ink-quiet:   oklch(22% 0.025 var(--hue) / 0.66); /* checked >= 4.5:1 on cream */
  --ink-faint:   oklch(22% 0.025 var(--hue) / 0.30); /* decoration only */
  --hairline:    oklch(22% 0.025 var(--hue) / 0.10);
  --ink-on-dark:       oklch(97% 0.015 var(--hue));
  --ink-on-dark-soft:  oklch(97% 0.015 var(--hue) / 0.76);
  --hairline-on-dark:  oklch(97% 0.015 var(--hue) / 0.16);

  /* Accent: the single dominant brand color */
  --accent:        oklch(46% 0.07 140);  /* deep willow: text/links on cream, >= 4.5:1 */
  --accent-bright: oklch(80% 0.09 140);  /* light willow on the dark band */
  --accent-soft:   oklch(46% 0.07 140 / 0.55);
  --accent-faint:  oklch(70% 0.08 140 / 0.18); /* willow tint for fills */
  --accent-hover:  oklch(39% 0.07 140);
  --on-accent:     oklch(98% 0.01 var(--hue));

  /* Typography: each family has ONE job */
  --font-display: "Literata", Georgia, serif;                              /* headings, big numbers */
  --font-ui:      "Onest", -apple-system, system-ui, "Segoe UI", sans-serif; /* body + UI */

  --fs-h1:    clamp(44px, 7vw, 84px);
  --fs-h2:    clamp(30px, 4.2vw, 48px);
  --fs-h3:    26px;
  --fs-h4:    20px;
  --fs-stat:  clamp(44px, 6vw, 72px);
  --fs-lead:  20px;
  --fs-body:  16px;
  --fs-small: 14px;
  --fs-label: 12px; /* uppercase + letter-spacing 0.1em */

  --lh-tight: 1.05;
  --lh-snug:  1.2;
  --lh-base:  1.6;

  /* Spacing: 4px base */
  --space-1: 4px;   --space-2: 8px;   --space-3: 12px;  --space-4: 16px;
  --space-5: 24px;  --space-6: 32px;  --space-7: 48px;  --space-8: 64px;
  --space-9: 96px;  --space-10: 128px;

  /* Layout */
  --container-max: 1200px;
  --measure:       640px; /* max width for section intros and body copy */
  --container-px:  32px;
  --section-py:    40px;
  --header-h:      64px;
  --touch:         44px;  /* minimum touch target */

  /* Shape: formal editorial, 4px everywhere */
  --radius:       4px;
  --radius-input: 4px;

  /* Elevation: two-layer shadows, warm-tinted */
  --shadow-sm: 0 1px 2px oklch(30% 0.03 var(--hue) / 0.10), 0 1px 1px oklch(30% 0.03 var(--hue) / 0.06);
  --shadow-md: 0 8px 20px oklch(30% 0.03 var(--hue) / 0.10), 0 2px 4px oklch(30% 0.03 var(--hue) / 0.06);
  --shadow-lg: 0 24px 48px oklch(30% 0.03 var(--hue) / 0.14), 0 8px 16px oklch(30% 0.03 var(--hue) / 0.08);

  /* Motion: one easing curve for everything */
  --ease:     cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast:   180ms var(--ease); /* hover/color feedback; over ~200ms feels laggy */
  --t-medium: 500ms var(--ease); /* reveals */
  --t-hero:   700ms var(--ease); /* one-time entrance on load */
  --stagger:  70ms;              /* delay between siblings; reads as a sequence, not a lag */
  --count-ms: 1600;              /* stat count-up duration, read by JS */
}

@media (max-width: 768px) {
  :root {
    --fs-h3: 22px;
    --fs-lead: 18px;
    --section-py: 28px;
    --container-px: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  :root { --t-fast: 0ms; --t-medium: 0ms; --t-hero: 0ms; --stagger: 0ms; --count-ms: 0; }
  *, *::before, *::after { animation-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* Visible focus for keyboard users */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }