/* =========================================================
   火博体育 · 共享外壳样式  /assets/site.css
   骨架：技术蓝图网格 + 侧边索引轨 + 夜场数据看板
   ========================================================= */

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

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-900);
  color: var(--text-1);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  padding-left: var(--rail-w);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, p, figure, blockquote { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0E1013;
  --ink-850: #12151A;
  --ink-800: #171A1F;
  --line: #2A2F36;
  --line-soft: #1F242B;
  --orange: #FF6A1A;
  --orange-soft: #FFA05C;
  --mint: #2BE3B0;
  --yellow: #FFD32A;
  --red: #FF3B3B;
  --paper: #F5F1EA;
  --ink-text: #10131A;

  --text-1: #F2F0EC;
  --text-2: #A8B0BA;
  --text-3: #6E7883;

  --rail-w: 118px;
  --top-h: 64px;
  --pad-x: clamp(20px, 4vw, 64px);
  --maxw: 1320px;

  --font-sans: "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --font-display: "Arial Narrow", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --font-num: "SFMono-Regular", Menlo, Consolas, "DejaVu Sans Mono", "Courier New", monospace;

  --ease-out: cubic-bezier(.22, .7, .3, 1);
}

/* ---------- 3. 蓝图网格底层 ---------- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(42, 47, 54, .62) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 47, 54, .62) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: .55;
}

/* ---------- 4. 排版层级 ---------- */
.t-display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(40px, 6.4vw, 92px);
  line-height: 1.02;
  letter-spacing: -.02em;
}

.t-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 3.6vw, 48px);
  line-height: 1.1;
  letter-spacing: -.01em;
}

.t-h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.25;
  letter-spacing: -.005em;
}

.t-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1;
}

.t-label,
.eyebrow {
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-3);
  line-height: 1.6;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  flex: none;
  background: var(--orange);
}

.prose {
  max-width: 38em;
  color: var(--text-2);
  font-size: 17px;
  line-height: 1.85;
}

.prose p + p { margin-top: 1em; }

.prose strong {
  font-weight: 600;
  color: var(--orange-soft);
  box-shadow: inset 0 -1px 0 rgba(255, 106, 26, .55);
}

.prose a {
  color: var(--orange-soft);
  text-decoration: none;
  box-shadow: inset 0 -1px 0 rgba(255, 160, 92, .5);
}

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

/* ---------- 5. 布局容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.section {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
}

.section--line { border-top: 1px solid var(--line); }
.section--deep { background: var(--ink-850); }
.section--paper {
  background: var(--paper);
  color: var(--ink-text);
}
.section--paper .t-label,
.section--paper .eyebrow { color: #6B6459; }
.section--paper .prose { color: #3A3742; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 28px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 6. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--orange);
  color: var(--ink-900);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  text-decoration: none;
  border-radius: 3px;
  transform: translateY(-160%);
  transition: transform .18s var(--ease-out);
}

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

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .18s var(--ease-out),
              color .18s var(--ease-out),
              border-color .18s var(--ease-out),
              transform .18s var(--ease-out);
}

.btn--primary {
  background: var(--orange);
  color: var(--ink-900);
}
.btn--primary:hover { background: var(--orange-soft); }

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text-1);
}
.btn--ghost:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.btn--block { width: 100%; }

/* ---------- 8. 状态点与标签 ---------- */
.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--text-3);
}
.dot--mint {
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(43, 227, 176, .16);
  animation: dotPulse 2.4s ease-in-out infinite;
}
.dot--orange { background: var(--orange); }
.dot--yellow { background: var(--yellow); }
.dot--red { background: var(--red); }

@keyframes dotPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .45; }
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ink-800);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--text-2);
}

/* ---------- 9. 分段控件 ---------- */
.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--ink-800);
  overflow: hidden;
}

.segmented__btn {
  padding: 10px 16px;
  border-right: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--text-2);
  cursor: pointer;
  transition: background-color .18s var(--ease-out), color .18s var(--ease-out);
}

.segmented__btn:last-child { border-right: 0; }

.segmented__btn:hover { color: var(--text-1); }

.segmented__btn[aria-selected="true"] {
  background: var(--orange);
  color: var(--ink-900);
  font-weight: 700;
}

/* ---------- 10. 纸张叠层卡片 ---------- */
.card-paper {
  position: relative;
  background: var(--paper);
  color: var(--ink-text);
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid #D8D2C8;
  box-shadow: 7px 7px 0 rgba(255, 106, 26, .18);
}

.card-paper__tag {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 8px;
  background: var(--ink-text);
  color: var(--paper);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.card-paper .t-h3 { color: var(--ink-text); }
.card-paper p { color: #3A3742; }

/* ---------- 11. 图片容器（页面阶段放 img） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(255, 106, 26, .14), rgba(43, 227, 176, .06)),
    var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(42, 47, 54, .7) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 47, 54, .7) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: .5;
}

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

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

.media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 6px 12px;
  background: var(--ink-900);
  color: var(--text-2);
  font-size: 11px;
  letter-spacing: .14em;
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-3);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li::after {
  content: "/";
  color: var(--line);
}

.breadcrumb li:last-child::after { content: ""; }

.breadcrumb a {
  color: var(--text-2);
  text-decoration: none;
}

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

/* ---------- 13. 横向索引轨道 ---------- */
.index-track {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 10px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.index-track::-webkit-scrollbar { height: 4px; }
.index-track::-webkit-scrollbar-track { background: var(--line-soft); }
.index-track::-webkit-scrollbar-thumb { background: var(--line); }

.index-track__item {
  flex: none;
  scroll-snap-align: start;
  min-width: 154px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--ink-800);
  color: var(--text-2);
  text-decoration: none;
  transition: border-color .18s var(--ease-out),
              color .18s var(--ease-out),
              transform .18s var(--ease-out);
}

.index-track__item:hover {
  border-color: var(--orange);
  color: var(--text-1);
  transform: translateY(-2px);
}

.index-track__item[aria-current="page"] {
  border-color: var(--orange);
  background: rgba(255, 106, 26, .1);
  color: var(--paper);
}

/* ---------- 14. 站点头部：侧边索引轨 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 120;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  padding: 22px 0 20px;
  background: var(--ink-800);
  border-right: 1px solid var(--line);
}

/* 品牌 */
.rail-brand {
  margin: 0 14px 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}

.rail-brand__mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.rail-brand__glyph {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--orange);
  color: var(--ink-900);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0;
  clip-path: polygon(0 0, 100% 0, 100% 78%, 78% 100%, 0 100%);
}

.rail-brand__text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  text-align: center;
}

.rail-brand__name {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--text-1);
  white-space: nowrap;
}

.rail-brand__sub {
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--text-3);
  white-space: nowrap;
}

/* 抽屉按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--text-2);
  font-size: 12px;
  letter-spacing: .14em;
  cursor: pointer;
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: var(--orange);
  transition: transform .2s var(--ease-out), opacity .2s var(--ease-out);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 遮罩（桌面隐藏） */
.nav-scrim { display: none; }

/* 主导航 */
.rail-nav {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  margin: 0 14px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.rail-nav::-webkit-scrollbar { width: 3px; }
.rail-nav::-webkit-scrollbar-thumb { background: var(--line); }

.rail-nav__label {
  margin-bottom: 12px;
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--text-3);
}

.rail-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.rail-nav__list a {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 8px 9px 12px;
  border-left: 2px solid transparent;
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: color .18s var(--ease-out),
              border-color .18s var(--ease-out),
              background-color .18s var(--ease-out);
}

.rail-nav__list a:hover {
  color: var(--text-1);
  background: rgba(255, 106, 26, .07);
}

.rail-nav__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--text-3);
}

.rail-nav__text { display: block; }

.rail-nav__list a[aria-current="page"] {
  color: var(--paper);
  border-left-color: var(--orange);
  background: linear-gradient(90deg, rgba(255, 106, 26, .18), rgba(255, 106, 26, 0) 88%);
}

.rail-nav__list a[aria-current="page"] .rail-nav__num { color: var(--orange); }

.rail-nav__foot {
  position: relative;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rail-nav__foot .btn {
  padding: 10px 8px;
  font-size: 13px;
  line-height: 1.35;
  text-align: center;
}

.chip-status {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 7px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: transparent;
  color: var(--text-2);
  font-size: 10px;
  letter-spacing: .12em;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
  transition: border-color .18s var(--ease-out), color .18s var(--ease-out);
}

.chip-status:hover {
  border-color: var(--mint);
  color: var(--text-1);
}

.chip-status__note {
  position: absolute;
  left: calc(100% + 12px);
  bottom: 0;
  z-index: 140;
  width: 236px;
  padding: 12px 14px;
  background: var(--ink-850);
  border: 1px solid var(--line);
  border-left: 2px solid var(--mint);
  border-radius: 3px;
  color: var(--text-2);
  font-size: 12px;
  letter-spacing: .01em;
  line-height: 1.7;
}

/* 滚动进度（竖向） */
.rail-progress {
  position: absolute;
  top: 0;
  right: -1px;
  bottom: 0;
  width: 2px;
  overflow: hidden;
  pointer-events: none;
}

.rail-progress__bar {
  display: block;
  width: 100%;
  height: calc(var(--p, 0) * 100%);
  background: linear-gradient(180deg, var(--orange), var(--orange-soft));
}

/* ---------- 15. 站点页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 110px);
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
  border-top: 1px solid var(--line);
  color: var(--text-2);
  font-size: 14px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(90px, 18vw, 220px);
  height: 2px;
  background: var(--orange);
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 64px) var(--pad-x) clamp(24px, 3vw, 36px);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 48px);
}

.footer-brand__label {
  margin-bottom: 14px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-3);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--paper);
}

.footer-brand__tag {
  margin-top: 8px;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--orange-soft);
}

.footer-brand__status {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-3);
}

.footer-col__title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-3);
}

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

.footer-col__list a {
  color: var(--text-2);
  font-size: 14px;
  text-decoration: none;
  transition: color .18s var(--ease-out);
}

.footer-col__list a:hover { color: var(--orange); }

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 32px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
}

.footer-meta__line {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-3);
}

.footer-meta__legal {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-3);
}

/* ---------- 16. 渐显 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .32s var(--ease-out), transform .32s var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

html.has-js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 17. 移动端：顶部条 + 抽屉 ---------- */
@media (max-width: 1023px) {
  body {
    padding-left: 0;
    padding-top: var(--top-h);
  }

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

  body::before { background-size: 56px 56px; }

  .site-header {
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--top-h);
    flex-direction: row;
    align-items: center;
    gap: 12px;
    padding: 0 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rail-brand {
    flex: 1 1 auto;
    min-width: 0;
    margin: 0;
    padding: 0;
    border-bottom: 0;
  }

  .rail-brand__mark {
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }

  .rail-brand__glyph {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  .rail-brand__text {
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
    text-align: left;
  }

  .rail-brand__name { font-size: 14px; }
  .rail-brand__sub { display: none; }

  .nav-toggle { display: inline-flex; }

  .nav-scrim {
    display: block;
    position: fixed;
    top: var(--top-h);
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 110;
    background: rgba(14, 16, 19, .72);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .22s var(--ease-out), visibility .22s var(--ease-out);
  }

  .site-header[data-nav-open="true"] .nav-scrim {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .rail-nav {
    position: fixed;
    top: var(--top-h);
    left: 0;
    bottom: 0;
    z-index: 115;
    width: min(86vw, 330px);
    margin: 0;
    padding: 22px 18px 32px;
    background: var(--ink-800);
    border-right: 1px solid var(--line);
    transform: translateX(-104%);
    transition: transform .24s var(--ease-out);
  }

  .site-header[data-nav-open="true"] .rail-nav {
    transform: translateX(0);
  }

  .rail-nav__label { font-size: 11px; }

  .rail-nav__list a {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
    padding: 12px 10px 12px 14px;
    font-size: 16px;
  }

  .rail-nav__num { font-size: 11px; }

  .rail-nav__foot { margin-top: 28px; }

  .rail-nav__foot .btn {
    padding: 13px 16px;
    font-size: 14px;
  }

  .chip-status {
    justify-content: flex-start;
    padding: 10px 12px;
    font-size: 11px;
  }

  .chip-status__note {
    position: static;
    width: auto;
    margin-top: 4px;
    border-left-width: 1px;
    border-top: 2px solid var(--mint);
  }

  .rail-progress {
    top: auto;
    right: 0;
    bottom: -1px;
    left: 0;
    width: auto;
    height: 2px;
  }

  .rail-progress__bar {
    width: calc(var(--p, 0) * 100%);
    height: 100%;
    background: linear-gradient(90deg, var(--orange), var(--orange-soft));
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

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

  .footer-meta { flex-direction: column; }

  .segmented { width: 100%; }
  .segmented__btn { flex: 1 1 auto; text-align: center; }
}

/* ---------- 18. 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;
  }

  html.has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .rail-nav,
  .nav-scrim { transition: none; }
}