/* ============================================================
   /assets/site.css — 欧博体育 共享外壳与基础组件
   夜间赛场指挥中心 · 左侧轨道导航 · 1px 线框 · 无投影
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body { margin: 0; }

h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }

ul, ol { padding: 0; list-style: none; }

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

img, svg { display: block; max-width: 100%; }

table { width: 100%; border-collapse: collapse; }

[hidden] { display: none !important; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 色彩 */
  --void: #070C0B;
  --deep: #0B1A16;
  --panel: #12241E;
  --line: #24352F;
  --cyan: #1FF0CE;
  --orange: #FF6A2B;
  --gold: #E2C48C;
  --silver: #9FAEAA;
  --paper: #F2F6F4;
  --mint: #6FE39A;
  --cyan-deep: #0E5F55;
  --ink: #04100D;

  /* 尺度 */
  --rail-w: 88px;
  --shell-w: 1280px;
  --gutter: clamp(20px, 4vw, 48px);
  --topbar-h: 64px;

  /* 字体 */
  --font-head: "Arial Narrow", "Helvetica Neue Condensed", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* 动效 */
  --dur-fast: 120ms;
  --dur-base: 300ms;
  --dur-slow: 560ms;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  background-color: var(--void);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(36, 53, 47, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 53, 47, 0.55) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.42;
}

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

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 4. 骨架容器 ---------- */
.shell {
  position: relative;
  z-index: 1;
  width: min(var(--shell-w), 100%);
  margin: 0;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  z-index: 1;
  padding-block: 64px;
}

.section--tight { padding-block: 40px; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 36px;
}

.section-head__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.eyebrow {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.lede {
  max-width: 38em;
  font-size: 18px;
  line-height: 1.9;
  color: var(--silver);
}

.divider {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

/* ---------- 5. 正文 ---------- */
.prose {
  max-width: 34em;
  color: var(--paper);
}

.prose p + p { margin-top: 1.2em; }

.prose p { color: var(--silver); }

.prose h2 {
  margin-top: 2em;
  margin-bottom: 0.6em;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.prose h3 {
  margin-top: 1.6em;
  margin-bottom: 0.5em;
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.prose ul,
.prose ol {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 1em;
}

.prose li {
  position: relative;
  padding-left: 22px;
  color: var(--silver);
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 6. 网格 ---------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

.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; }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--paper);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.2;
  transition:
    border-color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--cyan);
  background: rgba(31, 240, 206, 0.08);
  color: var(--cyan);
  transform: translateY(-2px);
}

.btn--primary {
  border-color: var(--cyan);
  background: var(--cyan);
  color: var(--ink);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--cyan-deep);
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--ghost { background: transparent; }

/* ---------- 8. 标签 / 芯片 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(18, 36, 30, 0.7);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.chip--cyan {
  border-color: rgba(31, 240, 206, 0.45);
  background: rgba(31, 240, 206, 0.08);
  color: var(--cyan);
}

.chip--mint {
  border-color: rgba(111, 227, 154, 0.4);
  background: rgba(111, 227, 154, 0.08);
  color: var(--mint);
}

.chip--orange {
  border-color: rgba(255, 106, 43, 0.4);
  background: rgba(255, 106, 43, 0.08);
  color: var(--orange);
}

/* ---------- 9. 卡片 ---------- */
.card {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  transition: border-color var(--dur-base) var(--ease);
}

.card:hover { border-color: rgba(31, 240, 206, 0.5); }

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.card__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.card__body {
  font-size: 15px;
  color: var(--silver);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

/* ---------- 10. 数字锚点 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.stat__label {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--silver);
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 32px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--line);
}

.breadcrumb a:hover { color: var(--cyan); }

.breadcrumb__item[aria-current="page"] { color: var(--paper); }

/* ---------- 12. 目录树 ---------- */
.tree {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tree__item {
  position: relative;
  padding-left: 26px;
}

.tree__item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.tree__item:last-child::before { bottom: auto; height: 22px; }

.tree__item::after {
  content: "";
  position: absolute;
  left: 9px;
  top: 22px;
  width: 11px;
  height: 1px;
  background: var(--line);
}

.tree__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  transition:
    border-color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease);
}

.tree__link:hover,
.tree__link:focus-visible {
  border-color: rgba(31, 240, 206, 0.45);
  background: rgba(31, 240, 206, 0.05);
}

.tree__level {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* ---------- 13. 标签页 / 分段切换 ---------- */
.tabs {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  width: fit-content;
  max-width: 100%;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(18, 36, 30, 0.6);
}

.tabs__tab {
  padding: 9px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--silver);
  transition:
    background-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease);
}

.tabs__tab:hover { color: var(--paper); border-color: var(--line); }

.tabs__tab[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.tabs__panel { outline: none; }

/* ---------- 14. 图片容器 ---------- */
.img-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(135deg, var(--deep), var(--void));
}

.img-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(115deg, rgba(31, 240, 206, 0.1), transparent 42%);
}

.img-frame--wide { aspect-ratio: 21 / 9; }
.img-frame--tall { aspect-ratio: 3 / 4; }
.img-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 15. 动效与进度 ---------- */
.reveal {
  opacity: 1;
  transform: none;
}

.js .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity var(--dur-slow) var(--ease),
    transform var(--dur-slow) var(--ease);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  z-index: 190;
  height: 2px;
  width: 0;
  pointer-events: none;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

/* ---------- 16. 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: calc(var(--rail-w) + 12px);
  z-index: 400;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--cyan);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transform: translateY(-200%);
  transition: transform var(--dur-base) var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 17. 站点头部：左侧竖向轨道 ---------- */
.site-header { display: block; }

.rail {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  z-index: 135;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  width: var(--rail-w);
  padding: 22px 0 22px;
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, var(--deep) 0%, var(--void) 68%);
}

/* 品牌 */
.rail-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.rail-brand__mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  border: 1px solid rgba(31, 240, 206, 0.5);
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 800;
  line-height: 1;
}

.rail-brand__text {
  display: none;
  flex-direction: column;
  gap: 2px;
}

.rail-brand__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.24em;
  writing-mode: vertical-rl;
  color: var(--paper);
}

.rail-brand__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--silver);
}

/* 实时状态条 */
.rail-status {
  writing-mode: vertical-rl;
  padding: 14px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(31, 240, 206, 0.06);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan);
  white-space: nowrap;
}

/* 栏目导航 */
.rail-nav {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
}

.rail-nav__list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rail-nav__link {
  position: relative;
  display: grid;
  place-items: center;
  width: 56px;
  height: 44px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--silver);
  transition:
    color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease);
}

.rail-nav__link:hover,
.rail-nav__link:focus-visible {
  border-color: rgba(31, 240, 206, 0.45);
  background: rgba(31, 240, 206, 0.07);
  color: var(--paper);
}

.rail-nav__link[aria-current="page"] {
  border-color: rgba(31, 240, 206, 0.5);
  background: rgba(31, 240, 206, 0.1);
  color: var(--cyan);
}

.rail-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -15px;
  top: 50%;
  width: 3px;
  height: 22px;
  border-radius: 2px;
  background: var(--cyan);
  transform: translateY(-50%);
}

.rail-nav__idx { line-height: 1; }

/* 栏目名浮层：不出现在内容流中 */
.rail-nav__label {
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  z-index: 6;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-6px, -50%);
  transition:
    opacity var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease),
    visibility var(--dur-fast) var(--ease);
}

.rail-nav__link:hover .rail-nav__label,
.rail-nav__link:focus-visible .rail-nav__label {
  opacity: 1;
  visibility: visible;
  transform: translate(0, -50%);
}

/* 轨道底部主行动 */
.rail-cta {
  writing-mode: vertical-rl;
  padding: 20px 9px;
  border-radius: 999px;
  background: var(--cyan);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.rail-cta:hover,
.rail-cta:focus-visible {
  background: var(--cyan-deep);
  color: var(--cyan);
}

/* 移动端遮罩与汉堡 */
.rail-scrim {
  position: fixed;
  inset: 0;
  z-index: 132;
  background: rgba(7, 12, 11, 0.74);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--dur-base) var(--ease),
    visibility var(--dur-base) var(--ease);
}

.rail-scrim[data-open="true"] { opacity: 1; visibility: visible; }

.mobile-brand,
.rail-toggle { display: none; }

.rail-toggle__bar {
  display: block;
  width: 16px;
  height: 1.5px;
  margin: 2.5px 0;
  border-radius: 2px;
  background: var(--paper);
  transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}

/* ---------- 18. 站点页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: 96px;
  border-top: 1px solid var(--line);
  background: var(--deep);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 190px;
  height: 2px;
  background: var(--cyan);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(240px, 1.1fr) 2fr;
  gap: 48px;
  width: min(var(--shell-w), 100%);
  margin: 0;
  padding: 64px var(--gutter) 32px;
}

.footer-brand__line {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.footer-brand__tag {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.footer-brand__summary {
  max-width: 34ch;
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--silver);
}

.footer-brand__cta { margin-top: 24px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.footer-col__title {
  margin-bottom: 16px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col__link {
  display: inline-block;
  border-bottom: 1px solid transparent;
  font-size: 14px;
  color: var(--silver);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.footer-col__link:hover,
.footer-col__link:focus-visible {
  border-color: rgba(31, 240, 206, 0.5);
  color: var(--cyan);
}

.footer-meta {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  margin-top: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.footer-meta__legal { color: var(--gold); }
.footer-meta__item { color: var(--silver); }

/* ---------- 19. 平板 ---------- */
@media (max-width: 1120px) {
  .col-3,
  .col-4 { grid-column: span 6; }
  .col-8 { grid-column: span 12; }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }
}

@media (max-width: 1024px) {
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 20. 移动端：轨道转右滑抽屉 ---------- */
@media (max-width: 900px) {
  body {
    padding-left: 0;
    padding-top: var(--topbar-h);
  }

  body::before { background-size: 64px 64px; }

  body.nav-open { overflow: hidden; }

  .skip-link { left: 12px; }

  .scroll-progress { left: 0; }

  .mobile-brand {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 130;
    display: flex;
    align-items: center;
    gap: 10px;
    height: var(--topbar-h);
    padding: 0 62px 0 16px;
    border-bottom: 1px solid var(--line);
    background: rgba(11, 26, 22, 0.94);
  }

  .mobile-brand__mark {
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    flex: 0 0 auto;
    border-radius: 10px;
    background: var(--cyan);
    color: var(--ink);
    font-family: var(--font-head);
    font-size: 16px;
    font-weight: 800;
  }

  .mobile-brand__name {
    overflow: hidden;
    font-family: var(--font-head);
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.08em;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  .rail-toggle {
    position: fixed;
    top: 12px;
    right: 14px;
    z-index: 140;
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--panel);
  }

  .rail-toggle[aria-expanded="true"] .rail-toggle__bar:nth-child(1) {
    transform: translateY(4px) rotate(45deg);
  }
  .rail-toggle[aria-expanded="true"] .rail-toggle__bar:nth-child(2) {
    opacity: 0;
  }
  .rail-toggle[aria-expanded="true"] .rail-toggle__bar:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
  }

  .rail {
    inset-inline-start: auto;
    inset-inline-end: 0;
    align-items: stretch;
    gap: 20px;
    width: min(300px, 86vw);
    padding: calc(var(--topbar-h) + 20px) 20px 24px;
    border-right: 0;
    border-left: 1px solid var(--line);
    background: linear-gradient(180deg, var(--deep), var(--void));
    visibility: hidden;
    transform: translateX(102%);
    transition:
      transform var(--dur-base) var(--ease),
      visibility var(--dur-base) var(--ease);
  }

  .rail[data-open="true"] {
    visibility: visible;
    transform: translateX(0);
  }

  .rail-brand { flex-direction: row; align-items: center; gap: 12px; }

  .rail-brand__text {
    display: flex;
    flex-direction: column;
  }

  .rail-brand__name { writing-mode: horizontal-tb; font-size: 15px; letter-spacing: 0.08em; }
  .rail-brand__sub { display: block; font-size: 11px; }

  .rail-status {
    writing-mode: horizontal-tb;
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 12px;
    white-space: normal;
    text-align: left;
  }

  .rail-nav { align-items: flex-start; }

  .rail-nav__list { width: 100%; gap: 2px; }

  .rail-nav__link {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    width: 100%;
    height: auto;
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 15px;
  }

  .rail-nav__link[aria-current="page"]::before {
    left: 0;
    height: 20px;
  }

  .rail-nav__label {
    position: static;
    padding: 0;
    border: 0;
    background: none;
    font-family: var(--font-body);
    font-size: 15px;
    color: inherit;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .rail-cta {
    writing-mode: horizontal-tb;
    padding: 14px 20px;
    text-align: center;
    letter-spacing: 0.12em;
  }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-inner { padding-top: 48px; }
}

/* ---------- 21. 手机 ---------- */
@media (max-width: 720px) {
  body { font-size: 16px; }

  .section { padding-block: 48px; }

  .col-3,
  .col-4,
  .col-6,
  .col-8 { grid-column: span 12; }

  .footer-cols { grid-template-columns: minmax(0, 1fr); }

  .footer-meta { flex-direction: column; gap: 10px; }

  .grid-12 { gap: 16px; }
}

/* ---------- 22. 低矮视口：压缩竖向轨道 ---------- */
@media (min-width: 901px) and (max-height: 800px) {
  .rail { gap: 14px; padding: 16px 0; }
  .rail-brand__mark { width: 38px; height: 38px; font-size: 17px; }
  .rail-brand__name { font-size: 11px; letter-spacing: 0.2em; }
  .rail-status { font-size: 9px; padding: 10px 7px; }
  .rail-nav__link { height: 38px; }
  .rail-cta { padding: 14px 8px; font-size: 12px; }
}

/* ---------- 23. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .js .reveal {
    opacity: 0;
    transform: none;
  }

  .js .reveal.is-visible { opacity: 1; }

  .btn:hover,
  .btn:focus-visible { transform: none; }
}