/* ===========================================================
   亚文网 CN 站 · 共享样式 /assets/site.css
   结构：Reset → 变量 → 中文排版 → 通用组件 → 侧轨头部 → 页脚 → 动效 → 响应式
   =========================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

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

/* ---------- 2. 变量 ---------- */
:root {
  /* 品牌色 */
  --cinnabar: #C0322B;
  --cinnabar-deep: #8C1F1A;
  --ink: #17161A;
  --charcoal: #2F2C33;
  --bamboo: #2E6B57;
  --bamboo-pale: #D9E7E0;
  --gold: #B8912F;
  --warm-bg: #F2EDE6;
  --paper: #FBF8F2;
  --line: #DAD2C6;
  --muted: #5B564E;
  --night-text: #F6F2EA;

  /* 尺寸 */
  --rail-w: 96px;
  --topbar-h: 64px;
  --content-max: 1180px;
  --measure: 34em;

  /* 字体 */
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, "Courier New", monospace;

  /* 字号阶梯 */
  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-16: 1rem;
  --fs-18: 1.125rem;
  --fs-22: 1.375rem;
  --fs-28: 1.75rem;
  --fs-38: 2.375rem;
  --fs-56: 3.5rem;
  --fs-84: 5.25rem;
  --fs-128: 8rem;

  --ease: cubic-bezier(.2, .7, .2, 1);
  --reveal-y: 16px;
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--warm-bg);
  background-image: radial-gradient(circle at 1px 1px, rgba(23, 22, 26, .055) 1px, transparent 0);
  background-size: 22px 22px;
  color: var(--charcoal);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(192, 50, 43, .18); color: var(--ink); }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--ink);
}
h1 { font-size: clamp(2.25rem, 5vw, var(--fs-56)); }
h2 { font-size: clamp(1.625rem, 3.4vw, var(--fs-38)); }
h3 { font-size: clamp(1.1875rem, 2vw, var(--fs-22)); line-height: 1.35; letter-spacing: -.01em; }
h4 { font-family: var(--font-body); font-weight: 700; font-size: var(--fs-18); line-height: 1.5; color: var(--ink); }

p { max-width: var(--measure); }

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

main { display: block; }
main:focus { outline: none; }

/* ---------- 4. 通用工具 ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: .86em;
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.wrap {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
}

.section { padding-block: clamp(44px, 7vw, 92px); }
.section--tight { padding-block: clamp(28px, 4vw, 52px); }

.lead {
  font-size: clamp(1rem, 1.4vw, var(--fs-18));
  line-height: 1.85;
  color: var(--charcoal);
  max-width: 32em;
}

.t-display {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.75rem, 9vw, var(--fs-84));
  line-height: .98;
  letter-spacing: -.03em;
  color: var(--ink);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--cinnabar);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  flex: none;
}

.rule {
  position: relative;
  height: 34px;
  margin-block: clamp(28px, 5vw, 56px);
  overflow: hidden;
}
.rule::before,
.rule::after {
  content: "";
  position: absolute;
  inset-inline: -4%;
  height: 1px;
  transform-origin: left center;
}
.rule::before { top: 14px; background: var(--cinnabar); transform: rotate(-3.2deg); opacity: .75; }
.rule::after { top: 22px; background: var(--bamboo); transform: rotate(-3.2deg); opacity: .55; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-family: var(--font-body);
  font-size: var(--fs-16);
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.2;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background-color .24s var(--ease), color .24s var(--ease), box-shadow .24s var(--ease);
}
.btn--primary { background: var(--cinnabar); color: #fff; }
.btn--primary:hover { background: var(--cinnabar-deep); }
.btn--ghost {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--ink);
}
.btn--ghost:hover { background: var(--ink); color: var(--night-text); }
.btn--bamboo { background: var(--bamboo); color: #fff; }
.btn--bamboo:hover { background: #245645; }

/* ---------- 6. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  line-height: 1.6;
  background: var(--bamboo-pale);
  color: var(--bamboo);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 6px 100%);
}
.tag--gold { background: rgba(184, 145, 47, .16); color: #86691c; }
.tag--ink { background: rgba(23, 22, 26, .08); color: var(--charcoal); }

/* ---------- 7. 面包屑 ---------- */
.crumbs { padding-block: 18px 0; }
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--muted);
}
.crumbs li + li::before { content: "/"; margin-inline-end: 8px; color: var(--line); }
.crumbs a { border-bottom: 1px solid transparent; transition: color .2s var(--ease), border-color .2s var(--ease); }
.crumbs a:hover { color: var(--cinnabar); border-bottom-color: var(--cinnabar); }

/* ---------- 8. 栅格与面板 ---------- */
.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.panel {
  position: relative;
  background: var(--paper);
  padding: clamp(20px, 2.6vw, 30px);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%, 0 18px);
}
.panel--ink {
  background: var(--ink);
  color: var(--night-text);
  box-shadow: inset 0 0 0 1px rgba(184, 145, 47, .34);
}
.panel--ink h2, .panel--ink h3 { color: var(--night-text); }
.panel--ink p { color: rgba(246, 242, 234, .78); }

/* ---------- 9. 图片容器（页面阶段放入 img） ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background:
    repeating-linear-gradient(135deg, rgba(23, 22, 26, .05) 0 1px, transparent 1px 12px),
    linear-gradient(150deg, #e9e2d8, #d7cec0);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(22px 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%, 0 22px);
}
.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}
.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media__cap {
  position: absolute;
  inset-inline-start: 0;
  inset-block-end: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  background: rgba(23, 22, 26, .84);
  color: var(--night-text);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 10px 100%);
}

/* ---------- 10. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  inset-block-start: 8px;
  inset-inline-start: 8px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--paper);
  color: var(--ink);
  font-size: var(--fs-14);
  font-weight: 600;
  box-shadow: inset 0 0 0 1px var(--cinnabar);
  transform: translateY(-180%);
  transition: transform .22s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 11. 侧轨头部（桌面） ---------- */
.rail {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  width: var(--rail-w);
  padding: 18px 0 16px;
  background: var(--ink);
  color: var(--night-text);
  border-inline-end: 1px solid rgba(184, 145, 47, .3);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: none;
}
.rail::-webkit-scrollbar { width: 0; height: 0; }

.rail__toggle { display: none; }

/* 品牌 */
.rail__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding-block: 2px;
}
.rail__mark {
  position: relative;
  display: block;
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  overflow: hidden;
}
.rail__mark svg { width: 100%; height: 100%; }
.rail__mark::after {
  content: "";
  position: absolute;
  inset: -30%;
  background: linear-gradient(105deg, transparent 42%, rgba(255, 255, 255, .55) 50%, transparent 58%);
  transform: translateX(-130%);
  animation: seal-sweep 1.7s var(--ease) .45s 1 both;
  pointer-events: none;
}
@keyframes seal-sweep { to { transform: translateX(130%); } }

.rail__brandtext {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 9px;
}
.rail__name {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1;
  letter-spacing: .16em;
  color: var(--night-text);
}
.rail__tag {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1;
  letter-spacing: .2em;
  color: rgba(246, 242, 234, .48);
}

/* 导航 */
.rail__nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  flex: 1 1 auto;
}
.rail__navtitle { display: none; }
.rail__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 100%;
}
.rail__link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  width: 100%;
  padding: 9px 4px;
  color: rgba(246, 242, 234, .7);
  transition: color .24s var(--ease), background-color .24s var(--ease);
}
.rail__link::before {
  content: "";
  position: absolute;
  inset-block: 8px;
  inset-inline-end: 0;
  width: 2px;
  background: var(--cinnabar);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform .28s var(--ease);
}
.rail__link:hover { color: var(--night-text); background: rgba(246, 242, 234, .06); }
.rail__link:hover::before { transform: scaleY(1); }
.rail__link[aria-current="page"] {
  color: var(--night-text);
  background: rgba(192, 50, 43, .18);
}
.rail__link[aria-current="page"]::before { transform: scaleY(1); }
.rail__link[aria-current="page"] .rail__idx { color: var(--gold); }
.rail__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
  color: rgba(184, 145, 47, .7);
}
.rail__txt {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 13px;
  line-height: 1.15;
  letter-spacing: .08em;
}

/* 侧轨 CTA */
.rail__cta {
  display: block;
  margin-block-start: auto;
  width: 56px;
  padding: 18px 0;
  text-align: center;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .22em;
  background: var(--cinnabar);
  color: #fff;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background-color .24s var(--ease), box-shadow .24s var(--ease);
}
.rail__cta:hover {
  background: var(--cinnabar-deep);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .22);
}

.rail__scrim { display: none; }

/* 主内容让位 */
@media (min-width: 1024px) {
  main,
  .site-footer { margin-inline-start: var(--rail-w); }
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-block-start: clamp(56px, 8vw, 112px);
  padding-block-start: clamp(40px, 6vw, 72px);
  background: var(--ink);
  color: var(--night-text);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-start: 0;
  height: 2px;
  background: linear-gradient(90deg,
      var(--cinnabar) 0 36%,
      var(--gold) 36% 58%,
      var(--bamboo) 58% 100%);
  opacity: .95;
}

.site-footer__inner {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.45fr);
  gap: clamp(30px, 5vw, 64px);
  align-items: start;
}

.site-footer__brand { max-width: 30em; }
.site-footer__mark {
  display: block;
  width: 46px;
  height: 46px;
  margin-block-end: 18px;
}
.site-footer__mark svg { width: 100%; height: 100%; }
.site-footer__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.0625rem, 1.6vw, var(--fs-22));
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--night-text);
  max-width: 18em;
  margin-block-end: 12px;
}
.site-footer__statement {
  font-size: var(--fs-14);
  line-height: 1.85;
  color: rgba(246, 242, 234, .62);
  max-width: 26em;
}

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
}
.site-footer__group-title {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
  padding-block-end: 10px;
  margin-block-end: 14px;
  border-block-end: 1px solid rgba(184, 145, 47, .28);
}
.site-footer__list { display: grid; gap: 11px; }
.site-footer__link {
  display: inline-block;
  font-size: var(--fs-14);
  color: rgba(246, 242, 234, .76);
  border-block-end: 1px solid transparent;
  transition: color .22s var(--ease), border-color .22s var(--ease);
}
.site-footer__link:hover { color: var(--night-text); border-block-end-color: var(--cinnabar); }

.site-footer__info { display: grid; gap: 2px; }
.site-footer__key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: rgba(246, 242, 234, .4);
}
.site-footer__val {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: rgba(246, 242, 234, .8);
  overflow-wrap: anywhere;
}

.site-footer__meta {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  margin-block-start: clamp(32px, 5vw, 56px);
  padding: 20px clamp(20px, 4vw, 48px) 30px;
  border-block-start: 1px solid rgba(246, 242, 234, .14);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: rgba(246, 242, 234, .58);
}
.site-footer__meta-item { white-space: nowrap; }
.site-footer__legal {
  position: relative;
  padding-inline-start: 12px;
  color: rgba(246, 242, 234, .72);
  transition: color .22s var(--ease);
}
.site-footer__legal::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: 50%;
  width: 4px;
  height: 4px;
  background: var(--bamboo);
  transform: translateY(-50%) rotate(45deg);
}
.site-footer__legal:hover { color: var(--cinnabar); }

/* ---------- 13. 滚动显现 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(var(--reveal-y));
  transition: opacity .42s var(--ease), transform .42s var(--ease);
  will-change: opacity, transform;
}
html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1023px) {
  html { scroll-padding-top: calc(var(--topbar-h) + 16px); }

  .rail {
    inset-block: 0 auto;
    inset-inline: 0;
    flex-direction: row;
    align-items: center;
    gap: 14px;
    width: auto;
    height: var(--topbar-h);
    padding: 0 clamp(12px, 3vw, 20px);
    overflow: visible;
    border-inline-end: 0;
    border-block-end: 1px solid rgba(184, 145, 47, .3);
  }

  .rail__toggle {
    position: relative;
    z-index: 75;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex: none;
    padding: 9px 13px;
    color: var(--night-text);
    box-shadow: inset 0 0 0 1px rgba(246, 242, 234, .24);
    cursor: pointer;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
    transition: box-shadow .22s var(--ease), background-color .22s var(--ease);
  }
  .rail__toggle:hover { box-shadow: inset 0 0 0 1px rgba(184, 145, 47, .8); }
  .rail__burger { display: grid; gap: 4px; width: 16px; }
  .rail__burger i {
    display: block;
    width: 16px;
    height: 1.5px;
    background: currentColor;
    transition: transform .26s var(--ease), opacity .2s var(--ease);
  }
  .rail[data-open] .rail__burger i:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
  .rail[data-open] .rail__burger i:nth-child(2) { opacity: 0; }
  .rail[data-open] .rail__burger i:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }
  .rail__toggle-text {
    font-size: var(--fs-12);
    letter-spacing: .1em;
    white-space: nowrap;
  }

  .rail__brand { flex-direction: row; align-items: center; gap: 10px; width: auto; }
  .rail__mark { width: 34px; height: 34px; border-radius: 6px; }
  .rail__brandtext { flex-direction: column; align-items: flex-start; gap: 2px; }
  .rail__name {
    writing-mode: horizontal-tb;
    font-size: 16px;
    letter-spacing: .06em;
  }
  .rail__tag {
    writing-mode: horizontal-tb;
    font-size: 9px;
    letter-spacing: .14em;
    color: rgba(246, 242, 234, .5);
  }

  .rail__nav {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    z-index: 70;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 22px;
    width: min(86vw, 340px);
    max-height: 100vh;
    padding: calc(var(--topbar-h) + 22px) 26px 34px;
    background: var(--ink);
    border-inline-end: 1px solid rgba(184, 145, 47, .32);
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(-102%);
    transition: transform .34s var(--ease);
  }
  .rail[data-open] .rail__nav { transform: translateX(0); }

  .rail__navtitle {
    display: block;
    font-family: var(--font-mono);
    font-size: var(--fs-12);
    letter-spacing: .22em;
    color: var(--gold);
    padding-block-end: 12px;
    border-block-end: 1px solid rgba(184, 145, 47, .3);
    max-width: none;
  }
  .rail__list { align-items: stretch; gap: 0; }
  .rail__link {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
    padding: 14px 4px;
    border-block-end: 1px solid rgba(246, 242, 234, .09);
  }
  .rail__link::before {
    inset-block: 10px;
    inset-inline: auto 0;
    width: 2px;
  }
  .rail__link[aria-current="page"] { background: rgba(192, 50, 43, .16); }
  .rail__idx { font-size: 11px; color: rgba(184, 145, 47, .8); }
  .rail__txt {
    writing-mode: horizontal-tb;
    font-size: 16px;
    letter-spacing: .06em;
    line-height: 1.4;
  }

  .rail__cta {
    margin-block-start: 4px;
    width: 100%;
    padding: 14px 0;
    writing-mode: horizontal-tb;
    letter-spacing: .1em;
    font-size: 15px;
  }

  .rail__scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 60;
    background: rgba(23, 22, 26, .58);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s var(--ease), visibility .3s var(--ease);
  }
  .rail[data-open] ~ * .rail__scrim,
  .rail[data-open] .rail__scrim {
    opacity: 1;
    visibility: visible;
  }

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

  .site-footer__inner { grid-template-columns: 1fr; }
  .site-footer__statement { max-width: none; }
}

@media (max-width: 760px) {
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .site-footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__group:last-child { grid-column: 1 / -1; }
  .site-footer__meta { gap: 8px 16px; }
  .rail__toggle-text { display: none; }
  .rail__tag { display: none; }
}

@media (max-width: 420px) {
  .site-footer__nav { grid-template-columns: minmax(0, 1fr); }
  .site-footer__group:last-child { grid-column: auto; }
}

@media (max-height: 800px) and (min-width: 1024px) {
  .rail { gap: 12px; padding-block: 14px; }
  .rail__tag { display: none; }
  .rail__brand { gap: 10px; }
  .rail__link { padding-block: 7px; }
  .rail__list { gap: 2px; }
  .rail__cta { padding-block: 14px; }
}

/* ---------- 15. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .rail__mark::after { display: none; }
  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}