:root {
  /* Brand palette — light, professional, easy on the eyes */
  --c-bg: #f7f7fb;
  --c-surface: #ffffff;
  --c-surface-2: #f1f1f7;
  --c-surface-tint: #eef1fb;
  --c-border: #e3e4ee;
  --c-border-strong: #c9cbdc;

  --c-ink: #1f2240;          /* primary text */
  --c-ink-soft: #4a4d6b;
  --c-ink-muted: #6c708a;

  --c-primary: #3b3a8c;      /* deep indigo */
  --c-primary-soft: #5b59b8;
  --c-primary-50: #ecebfa;

  --c-accent-teal: #0e9aa7;
  --c-accent-teal-50: #e2f5f6;
  --c-accent-amber: #d97706;
  --c-accent-amber-50: #fdf1de;
  --c-accent-indigo: #6366f1;
  --c-accent-indigo-50: #eef0ff;
  --c-accent-rose: #db2777;
  --c-accent-rose-50: #fde7f1;

  --c-success: #047857;
  --c-warn: #b45309;
  --c-danger: #b91c1c;

  --c-code-bg: #f4f4fb;
  --c-code-inline-bg: #eef0fa;
  --c-code-ink: #2a2c4d;
  --c-code-keyword: #6d28d9;
  --c-code-string: #047857;
  --c-code-number: #b45309;
  --c-code-comment: #8a8da8;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  /* Radii */
  --radius-1: 4px;
  --radius-2: 8px;
  --radius-3: 12px;
  --radius-4: 18px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-1: 0 1px 2px rgba(31, 34, 64, 0.06), 0 1px 1px rgba(31, 34, 64, 0.04);
  --shadow-2: 0 4px 10px rgba(31, 34, 64, 0.08), 0 2px 4px rgba(31, 34, 64, 0.05);
  --shadow-3: 0 16px 40px rgba(31, 34, 64, 0.12), 0 6px 12px rgba(31, 34, 64, 0.06);

  /* Typography */
  --ff-sans: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --ff-mono: "JetBrains Mono", "Fira Code", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --ff-display: "Inter", system-ui, sans-serif;

  --fs-1: 0.78rem;
  --fs-2: 0.875rem;
  --fs-3: 1rem;
  --fs-4: 1.125rem;
  --fs-5: 1.35rem;
  --fs-6: 1.65rem;
  --fs-7: 2.05rem;
  --fs-8: 2.6rem;
  --fs-9: 3.4rem;

  --lh-tight: 1.18;
  --lh-snug: 1.32;
  --lh-base: 1.65;

  /* Layout */
  --content-max: min(1680px, 94vw);
  --prose-max: 78ch;
  --header-height: 68px;

  /* Motion */
  --t-fast: 120ms cubic-bezier(0.4, 0, 0.2, 1);
  --t-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --t-slow: 380ms cubic-bezier(0.4, 0, 0.2, 1);
}

@media (min-width: 1280px) {
  :root {
    --header-height: 76px;
  }
}

@media (min-width: 1920px) {
  :root {
    --content-max: min(1840px, 96vw);
  }
}