:root {
  --paper: #FAF6EC;
  --paper-warm: #F7F1E4;
  --paper-fold: #EDE4D0;
  --ink: #2A2520;
  --ink-soft: #4A413A;
  --ink-mute: #6B5D4F;
  --hair: rgba(42, 37, 32, 0.18);
  --hair-strong: rgba(42, 37, 32, 0.42);

  --pine: #5D7063;
  --wax: #C4997A;
  --wax-deep: #9C6E50;

  --sea-1: #1A2632;
  --sea-2: #2A3A4A;
  --sea-3: #4A6070;
  --sea-4: #8AA0B0;
  --sea-foam: #D9E2E6;
  --moon: #F0E6D2;

  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", Georgia, "Times New Roman", serif;
  --serif-italic: "Songti SC", "Noto Serif SC", "Cormorant Garamond", Georgia, serif;

  --type-display:  clamp(2.4rem, 1rem + 3.5vw, 5rem);
  --type-h1:       clamp(2rem, 1rem + 2.4vw, 3.4rem);
  --type-h2:       clamp(1.6rem, 1rem + 1.6vw, 2.4rem);
  --type-h3:       clamp(1.25rem, 1rem + 1vw, 1.75rem);
  --type-body:     clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --type-fine:     0.8125rem;
  --type-caps:     0.75rem;

  --leading-tight: 1.18;
  --leading-prose: 1.7;
  --tracking-caps: 0.22em;
  --tracking-title: 0.04em;

  --gutter: clamp(1.25rem, 1rem + 1.6vw, 2.5rem);
  --shell:  min(1440px, 100% - var(--gutter) * 2);
  --rule:   1px;

  --space-xs: 0.5rem;
  --space-s:  1rem;
  --space-m:  1.75rem;
  --space-l:  3rem;
  --space-xl: 5rem;
  --space-2xl: clamp(6rem, 4rem + 6vw, 10rem);

  --duration-quick: 180ms;
  --duration-base:  320ms;
  --duration-slow:  720ms;
  --duration-drift: 14s;
  --ease-paper: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-ink:   cubic-bezier(0.4, 0, 0.2, 1);
  --ease-tide:  cubic-bezier(0.45, 0, 0.55, 1);

  /* legacy aliases — sites/legacy-* 与 check-web-surfaces 期望 --lv-* 前缀。
     新代码用上方 token；旧引用通过这一段桥接。 */
  --lv-paper: var(--paper);
  --lv-paper-warm: var(--paper-warm);
  --lv-ink: var(--ink);
  --lv-ink-soft: var(--ink-soft);
  --lv-ink-mute: var(--ink-mute);
  --lv-pine: var(--pine);
  --lv-clay: var(--wax);
  --lv-sea-1: var(--sea-1);
  --lv-sea-2: var(--sea-2);
  --lv-sea-3: var(--sea-3);
  --lv-sea-4: var(--sea-4);
  --lv-rule: var(--hair);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: light;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 400;
  font-size: var(--type-body);
  line-height: var(--leading-prose);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
input, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--ink); color: var(--paper); }

.shell { width: var(--shell); margin-inline: auto; }

.rule { border: 0; height: var(--rule); background: var(--hair); margin: 0; }

.eyebrow {
  font-size: var(--type-caps);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--ink-mute);
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}