:root {
  color-scheme: dark;

  /* Longtide / 潮汐测绘桌 */
  --lt-sea-1000: #040b0d;
  --lt-sea-950: #071214;
  --lt-sea-900: #0a1719;
  --lt-sea-850: #0d1c1f;
  --lt-sea-800: #122326;
  --lt-sea-750: #172b2e;
  --lt-paper-100: #f3ecd9;
  --lt-paper-150: #e9dfc7;
  --lt-paper-300: #cfc3aa;
  --lt-ink-900: #172122;
  --lt-text: #f0e8d5;
  --lt-text-soft: #c7cec7;
  --lt-text-muted: #9eadaa;
  --lt-brass: #c79a58;
  --lt-brass-bright: #e0b874;
  --lt-teal: #79a99f;
  --lt-teal-deep: #477b74;
  --lt-danger: #b56a5f;
  --lt-success: #78a692;
  --lt-divider: rgba(240, 232, 213, 0.14);
  --lt-divider-strong: rgba(240, 232, 213, 0.27);
  --lt-glass: rgba(7, 18, 20, 0.82);

  --lt-font-sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --lt-font-serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --lt-text-xs: clamp(0.75rem, 0.72rem + 0.08vw, 0.8125rem);
  --lt-text-sm: clamp(0.875rem, 0.84rem + 0.1vw, 0.9375rem);
  --lt-text-base: clamp(0.9375rem, 0.9rem + 0.12vw, 1rem);
  --lt-text-lg: clamp(1.0625rem, 1rem + 0.2vw, 1.1875rem);
  --lt-title-sm: clamp(1.45rem, 1.24rem + 0.72vw, 2rem);
  --lt-title: clamp(2rem, 1.58rem + 1.35vw, 2.75rem);

  --lt-space-1: 0.25rem;
  --lt-space-2: 0.5rem;
  --lt-space-3: 0.75rem;
  --lt-space-4: 1rem;
  --lt-space-5: 1.5rem;
  --lt-space-6: 2rem;
  --lt-space-7: 3rem;
  --lt-space-8: 4rem;

  --lt-radius-xs: 0.125rem;
  --lt-radius-sm: 0.25rem;
  --lt-radius-md: 0.5rem;
  --lt-radius-pill: 999px;
  --lt-hit: 2.75rem;
  --lt-topbar: 4rem;
  --lt-content-max: 92rem;

  --lt-shadow-float: 0 1.5rem 4rem rgba(0, 0, 0, 0.34);
  --lt-shadow-paper: 0 0.9rem 2.5rem rgba(0, 0, 0, 0.22);
  --lt-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --lt-ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --lt-motion-fast: 150ms;
  --lt-motion-page: 220ms;
  --lt-motion-panel: 300ms;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --lt-motion-fast: 0.01ms;
    --lt-motion-page: 0.01ms;
    --lt-motion-panel: 0.01ms;
  }
}