:root {
  /* Core theme */
  --color-site-bg: #12101c;
  --color-site-bg-soft: #1b1730;
  --color-panel: #fffdf9;
  --color-panel-raised: #ffffff;
  --color-panel-soft: #f5f2ee;
  --color-nav: #171329;
  --color-nav-raised: #211b3b;
  --color-nav-text: #f8f5ff;
  --color-nav-muted: #b9b2cd;
  --color-accent: #7357d8;
  --color-accent-strong: #563bb7;
  --color-accent-soft: #eeeaff;
  --color-secondary: #168b85;
  --color-secondary-soft: #dcf6f2;
  --color-text: #292632;
  --color-text-strong: #17141f;
  --color-muted: #6f6979;
  --color-border: #dcd6df;
  --color-border-strong: #bdb5c5;
  --color-link: #2c62b5;
  --color-link-hover: #1d4789;
  --color-wanted: #a6344f;
  --color-wanted-soft: #fff0f3;
  --color-success: #197347;
  --color-success-soft: #e9f8ef;
  --color-warning: #936006;
  --color-warning-soft: #fff5d7;
  --color-danger: #ae2e3f;
  --color-danger-soft: #ffedf0;
  --color-focus: #f5bd42;
  --color-code-bg: #24202d;
  --color-code-text: #f8f6fb;

  /* Typography: system stacks keep the site fully offline. */
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: Georgia, "Times New Roman", serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: clamp(1.25rem, 2vw, 1.5rem);
  --text-2xl: clamp(1.65rem, 3vw, 2.15rem);
  --text-3xl: clamp(2.15rem, 5vw, 3.55rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Shape and depth */
  --radius-sm: 0.3rem;
  --radius-md: 0.55rem;
  --radius-lg: 0.85rem;
  --radius-xl: 1.2rem;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgb(20 15 35 / 10%), 0 2px 7px rgb(20 15 35 / 7%);
  --shadow-md: 0 9px 30px rgb(9 6 20 / 15%);
  --shadow-lg: 0 18px 60px rgb(7 4 15 / 30%);
  --focus-ring: 0 0 0 3px var(--color-focus);

  /* Layout */
  --sidebar-width: 16.25rem;
  --content-width: 78rem;
  --reading-width: 49rem;
  --banner-height: 15rem;
  --topbar-height: 4.25rem;
  --infobox-width: 19rem;
  --transition-fast: 140ms ease;
  --transition-base: 220ms ease;
}

@media (prefers-contrast: more) {
  :root {
    --color-border: #8f8798;
    --color-muted: #4f4958;
    --color-link: #174b98;
  }
}