/* ==========================================================================
   365平台 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 轨道头部 / 页脚 / 通用组件 / 网格 / 响应式
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body, h1, h2, h3, h4, h5, h6, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: 0; }
main { display: block; }

/* ---------- 设计变量 ---------- */
:root {
  --ink-950: #0A1424;
  --ink-900: #12203A;
  --blue-700: #1B3E77;
  --teal-500: #14B8A6;
  --teal-700: #0F766E;
  --amber-500: #F59E0B;
  --rust-600: #C2410C;
  --cream-050: #FAF6EC;
  --cream-100: #EFE7D6;
  --slate-300: #BFCCDE;
  --slate-600: #5A6B85;
  --white: #FFFFFF;

  --line-dark: rgba(191, 204, 222, 0.24);
  --line-light: rgba(10, 20, 36, 0.16);
  --line-cream: rgba(10, 20, 36, 0.12);

  --font-display: "Archivo", "Space Grotesk", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --font-body: "Inter", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "Source Han Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 1240px;
  --rail-h: 68px;
  --rail-w: 0px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ---------- 基础排版 ---------- */
body {
  background: var(--ink-950);
  color: var(--cream-050);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  padding-top: var(--rail-h);
  padding-left: var(--rail-w);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.h-display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 5.6vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}
.h-1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 3.8vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.h-2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.2;
}
.lead {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.7;
  color: rgba(250, 246, 236, 0.82);
  max-width: 60ch;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal-500);
}
.sheet .eyebrow, .ink-panel .eyebrow { color: var(--teal-500); }
.sheet .eyebrow { color: var(--teal-700); }

.sec-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 3.6vw, 48px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--rust-600);
}
.figure-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--amber-500);
  font-variant-numeric: tabular-nums;
}
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.text-muted { color: var(--slate-600); }
.sheet .text-muted { color: var(--slate-600); }
.u-visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

#main-content { scroll-margin-top: 84px; }

/* ---------- 底色分区 ---------- */
.sheet { background: var(--cream-050); color: var(--ink-950); }
.sheet--tint { background: var(--cream-100); color: var(--ink-950); }
.ink-panel { background: var(--ink-950); color: var(--cream-050); }
.ink-panel--deep { background: var(--ink-900); color: var(--cream-050); }

/* ---------- 容器与网格 ---------- */
.shell {
  width: 100%;
  max-width: calc(var(--shell) + 48px);
  margin-inline: auto;
  padding-inline: 20px;
}
@media (min-width: 760px) { .shell { padding-inline: 32px; } }

.section { padding-block: clamp(56px, 7vw, 104px); }
.section--tight { padding-block: clamp(36px, 4vw, 60px); }

.grid, .bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

@media (min-width: 640px) and (max-width: 1023px) {
  .grid, .bento { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 18px; }
  .col-3 { grid-column: span 3; }
  .col-4 { grid-column: span 3; }
  .col-6, .col-8, .col-12 { grid-column: span 6; }
}
@media (max-width: 639px) {
  .grid, .bento { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 16px; }
  .col-3 { grid-column: span 3; }
  .col-4, .col-6, .col-8, .col-12 { grid-column: span 6; }
}

.prose { max-width: 68ch; }
.prose p + p { margin-top: 1.2em; }
.prose h2 { margin-top: 1.6em; margin-bottom: 0.6em; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 20px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  text-align: center;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.btn--primary { background: var(--amber-500); color: var(--ink-950); border-color: var(--amber-500); }
.btn--primary:hover { background: #FFB224; border-color: #FFB224; }
.btn--ghost { background: transparent; color: var(--cream-050); border-color: rgba(191, 204, 222, 0.42); }
.btn--ghost:hover { border-color: var(--teal-500); color: var(--white); }
.sheet .btn--ghost, .sheet--tint .btn--ghost { color: var(--ink-950); border-color: rgba(10, 20, 36, 0.28); }
.sheet .btn--ghost:hover, .sheet--tint .btn--ghost:hover { border-color: var(--teal-700); color: var(--teal-700); }
.btn--block { width: 100%; }
.btn:active { transform: translateY(1px); }

/* ---------- 卡片与框景 ---------- */
.card {
  background: var(--cream-050);
  color: var(--ink-950);
  border: 1px solid var(--line-light);
  padding: 24px;
  box-shadow: 0 22px 48px -34px rgba(0, 0, 0, 0.75);
}
.card--ink { background: var(--ink-900); color: var(--cream-050); border-color: var(--line-dark); }
.card--teal {
  background: linear-gradient(180deg, rgba(20, 184, 166, 0.16), rgba(10, 20, 36, 0.2));
  border-color: rgba(20, 184, 166, 0.42);
  color: var(--cream-050);
}
.card__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--rust-600);
}
.card--ink .card__index, .card--teal .card__index { color: var(--amber-500); }

.stage {
  position: relative;
  border: 1px solid var(--line-dark);
  padding: clamp(28px, 5vw, 72px);
}
.stage::before, .stage::after {
  content: "";
  position: absolute;
  width: 14px; height: 14px;
  border: 1px solid var(--teal-500);
}
.stage::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.stage::after { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }
.sheet .stage { border-color: var(--line-light); }

.ticks {
  height: 10px;
  background: repeating-linear-gradient(90deg, currentColor 0 1px, transparent 1px 12px);
  opacity: 0.35;
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate-300);
}
.breadcrumbs a { text-decoration: none; border-bottom: 1px solid currentColor; }
.breadcrumbs a:hover { color: var(--teal-500); }
.breadcrumbs .sep { color: var(--rust-600); }
.sheet .breadcrumbs { color: var(--slate-600); }

/* ---------- 筛选按钮组 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-dark);
}
.sheet .filter-bar, .sheet--tint .filter-bar { border-bottom-color: var(--line-light); }
.chip {
  min-height: 40px;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid rgba(191, 204, 222, 0.38);
  background: transparent;
  color: inherit;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.chip:hover { border-color: var(--teal-500); }
.chip[aria-pressed="true"] {
  background: var(--teal-500);
  border-color: var(--teal-500);
  color: var(--ink-950);
  font-weight: 700;
}
.sheet .chip, .sheet--tint .chip { border-color: rgba(10, 20, 36, 0.24); }
.sheet .chip[aria-pressed="true"], .sheet--tint .chip[aria-pressed="true"] {
  background: var(--teal-700);
  border-color: var(--teal-700);
  color: var(--cream-050);
}

[data-filter-item] { transition: opacity 0.16s linear, transform 0.16s var(--ease); }
[data-filter-item].is-out { opacity: 0; transform: scale(0.985); }

/* ---------- 数据表 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line-dark); }
.sheet .table-wrap, .sheet--tint .table-wrap { border-color: var(--line-light); }
.data-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.5;
}
.data-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--blue-700);
  color: var(--white);
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 14px 16px;
  white-space: nowrap;
}
.data-table td {
  padding: 14px 16px;
  border-top: 1px solid var(--line-dark);
  vertical-align: top;
}
.sheet .data-table td, .sheet--tint .data-table td { border-top-color: var(--line-cream); }
.data-table tbody tr { transition: background-color 0.16s linear; }
.data-table tbody tr:hover { background: rgba(20, 184, 166, 0.14); }
.sheet .data-table tbody tr:hover { background: rgba(20, 184, 166, 0.16); }
.data-table .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ---------- 图片 / 图形容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-dark);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(180deg, rgba(20, 184, 166, 0.16), rgba(10, 20, 36, 0) 62%),
    repeating-linear-gradient(0deg, rgba(191, 204, 222, 0.14) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, rgba(191, 204, 222, 0.14) 0 1px, transparent 1px 32px);
}
.media > img, .media > svg, .media > picture > img {
  width: 100%; height: 100%; object-fit: cover;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media__caption {
  position: absolute;
  left: 0; bottom: 0;
  padding: 10px 14px;
  background: rgba(10, 20, 36, 0.8);
  color: var(--cream-050);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}
.sheet .media { border-color: var(--line-light); }

/* ---------- 进入动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
  transition-delay: calc(var(--reveal-delay, 0) * 60ms);
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 跳转链接与焦点 ---------- */
.skip-link {
  position: fixed;
  top: 8px; left: 8px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--teal-500);
  color: var(--ink-950);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.18s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

:focus-visible { outline: 2px solid var(--teal-500); outline-offset: 2px; }

/* ==========================================================================
   头部 · 侧边轨道导航
   ========================================================================== */
.site-rail {
  position: fixed;
  top: 0; left: 0;
  z-index: 60;
  width: 100%;
  height: var(--rail-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 16px;
  background: var(--ink-950);
  color: var(--cream-050);
  border-bottom: 1px solid var(--line-dark);
}

.brand {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--cream-050);
  min-width: 0;
}
.brand__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.brand__tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--teal-500);
  white-space: nowrap;
}

.rail-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid rgba(191, 204, 222, 0.38);
  color: var(--cream-050);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.rail-toggle__bars { display: inline-flex; flex-direction: column; gap: 4px; width: 18px; }
.rail-toggle__bars i { display: block; height: 1px; background: currentColor; }
.rail-toggle__bars i:nth-child(2) { width: 70%; }
.site-rail[data-open="true"] .rail-toggle { border-color: var(--teal-500); color: var(--teal-500); }

.rail-nav {
  position: fixed;
  top: var(--rail-h);
  left: 0; right: 0; bottom: 0;
  z-index: 59;
  display: flex;
  flex-direction: column;
  padding: 24px 20px 32px;
  background: var(--ink-950);
  border-top: 1px solid var(--line-dark);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s linear;
}
.site-rail[data-open="true"] .rail-nav {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.rail-nav__list { display: flex; flex-direction: column; }
.rail-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 58px;
  padding: 0 8px;
  border-left: 2px solid transparent;
  text-decoration: none;
  color: rgba(250, 246, 236, 0.78);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.rail-nav__link:hover { color: var(--white); background: rgba(20, 184, 166, 0.1); }
.rail-nav__link:focus-visible { outline-offset: -2px; }
.rail-nav__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--amber-500);
}
.rail-nav__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.rail-nav__link[aria-current="page"] {
  color: var(--cream-050);
  border-left-color: var(--teal-500);
  background: linear-gradient(90deg, rgba(20, 184, 166, 0.18), rgba(20, 184, 166, 0) 78%);
}
.rail-nav__link[aria-current="page"] .rail-nav__num { color: var(--rust-600); }
.rail-nav__link[aria-current="page"] .rail-nav__label { color: var(--white); }

.rail-nav__foot {
  margin-top: auto;
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--line-dark);
}
.rail-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(250, 246, 236, 0.62);
  padding-bottom: 6px;
}

.rail-progress {
  position: absolute;
  left: 0; bottom: -1px;
  width: 100%; height: 2px;
  background: var(--teal-500);
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
  pointer-events: none;
}

body.is-nav-open { overflow: hidden; }

/* ---------- 桌面：轨道 ---------- */
@media (min-width: 900px) {
  :root { --rail-w: 88px; --rail-h: 0px; }

  body { padding-top: 0; padding-left: var(--rail-w); }

  .site-rail {
    width: var(--rail-w);
    height: 100vh;
    height: 100dvh;
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 22px 0 0;
    border-bottom: 0;
    border-right: 1px solid var(--line-dark);
    transition: width 0.24s var(--ease);
  }

  .brand { flex-direction: column; align-items: center; gap: 4px; }
  .brand__tagline { display: none; }

  .rail-toggle { display: none; }

  .rail-nav {
    position: static;
    flex: 1 1 auto;
    width: 100%;
    padding: 24px 0 0;
    border-top: 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    overflow: visible;
    background: transparent;
  }

  .rail-nav__link {
    justify-content: center;
    gap: 0;
    min-height: 52px;
    padding: 0;
    border-left: 0;
  }
  .rail-nav__link::before {
    content: "";
    position: absolute;
    left: 0; top: 8px; bottom: 8px;
    width: 3px;
    background: transparent;
    transition: background-color 0.18s var(--ease);
  }
  .rail-nav__link[aria-current="page"] {
    background: linear-gradient(90deg, rgba(20, 184, 166, 0.22), rgba(20, 184, 166, 0) 90%);
  }
  .rail-nav__link[aria-current="page"]::before { background: var(--teal-500); }

  .rail-nav__num { font-size: 13px; }

  .rail-nav__foot {
    margin-top: auto;
    padding: 14px 0 18px;
    gap: 8px;
    border-top: 1px solid var(--line-dark);
  }
  .rail-meta { display: none; }
  .rail-nav__foot .btn--ghost { display: none; }
  .rail-nav__foot .btn {
    width: 100%;
    min-height: 0;
    border-radius: 0;
  }
  .rail-nav__foot .btn--primary {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    padding: 18px 0;
    font-size: 13px;
    letter-spacing: 0.14em;
  }

  .rail-progress {
    left: auto; right: -1px; bottom: 0;
    width: 2px; height: 100%;
    transform: scaleY(var(--progress, 0));
    transform-origin: center top;
  }

  body.is-nav-open { overflow: auto; }
}

/* 窄轨（900–1399px）：编号常驻，栏目名悬停/聚焦滑出 */
@media (min-width: 900px) and (max-width: 1399px) {
  .rail-nav__label {
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%) translateX(-6px);
    padding: 6px 12px;
    background: var(--cream-050);
    color: var(--ink-950);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.02em;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    box-shadow: 0 16px 30px -18px rgba(0, 0, 0, 0.8);
    transition: opacity 0.16s var(--ease), transform 0.16s var(--ease);
  }
  .rail-nav__link:hover .rail-nav__label,
  .rail-nav__link:focus-visible .rail-nav__label {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
  }
}

/* 宽轨（≥1400px）：轨道展开，栏目名常驻 */
@media (min-width: 1400px) {
  :root { --rail-w: 216px; }

  .site-rail { align-items: stretch; padding: 26px 0 0; }
  .brand { flex-direction: column; align-items: flex-start; gap: 4px; padding: 0 20px; }
  .brand__tagline { display: block; }

  .rail-nav { padding: 28px 0 0; }
  .rail-nav__link {
    justify-content: flex-start;
    gap: 14px;
    min-height: 54px;
    padding: 0 20px;
  }
  .rail-nav__link::before { top: 0; bottom: 0; }
  .rail-nav__num { width: 34px; font-size: 13px; }
  .rail-nav__label { position: static; font-size: 15px; opacity: 1; }

  .rail-nav__foot { padding: 16px 20px 22px; }
  .rail-meta { display: block; font-size: 11px; }
  .rail-nav__foot .btn--ghost { display: inline-flex; }
  .rail-nav__foot .btn--primary {
    writing-mode: horizontal-tb;
    padding: 0 14px;
    font-size: 14px;
    letter-spacing: 0.02em;
  }
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-foot {
  background: var(--ink-950);
  color: var(--cream-050);
  border-top: 1px solid var(--line-dark);
  padding-block: clamp(48px, 6vw, 84px) 28px;
  margin-top: clamp(40px, 6vw, 80px);
}
.site-foot__inner { display: block; }

.site-foot__eyebrow {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.site-foot__eyebrow::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--line-dark);
}

.site-foot__grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 36px 24px;
}
.site-foot__brand, .site-foot__contact, .site-foot__cols { grid-column: span 12; }

.site-foot__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 2.6vw, 30px);
  letter-spacing: -0.02em;
}
.site-foot__sub {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--teal-500);
  margin-top: 6px;
}
.site-foot__note {
  margin-top: 18px;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(250, 246, 236, 0.72);
}
.site-foot__note--sm { font-size: 13px; line-height: 1.65; color: rgba(250, 246, 236, 0.58); margin-top: 14px; }

.site-foot__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber-500);
  margin-bottom: 14px;
}

.site-foot__contact-list { display: block; }
.foot-row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(191, 204, 222, 0.14);
}
.foot-row dt {
  flex: 0 0 56px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate-300);
}
.foot-row dd { font-size: 15px; color: var(--cream-050); word-break: break-word; }

.site-foot__cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 24px;
}
.site-foot__col a {
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  color: rgba(250, 246, 236, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.site-foot__col a:hover { color: var(--cream-050); border-bottom-color: var(--teal-500); }

.site-foot__legal {
  margin-top: clamp(36px, 5vw, 56px);
  padding-top: 20px;
  border-top: 1px solid var(--line-dark);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(250, 246, 236, 0.6);
}
.site-foot__legal-item { word-break: break-word; }

@media (min-width: 760px) {
  .site-foot__brand { grid-column: span 6; }
  .site-foot__contact { grid-column: span 6; }
  .site-foot__cols { grid-column: span 12; }
}
@media (min-width: 1024px) {
  .site-foot__brand { grid-column: span 4; }
  .site-foot__contact { grid-column: span 4; }
  .site-foot__cols { grid-column: span 4; }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
  .rail-progress { transition: none; }
}