/* ==========================================================================
   B体育娱乐 · 共享样式表 /assets/site.css
   夜场深靛蓝底 + 荧光橙/电光青强调 · 框架式导航 · 非对称编辑部节奏
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption, blockquote, dl, dt, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, picture, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B1330;
  --ink-deep: #070E24;
  --indigo: #1B1B47;
  --teal: #08262A;
  --wine: #5B1230;
  --orange: #FF6A1A;
  --cyan: #14E0C8;
  --white: #FFF6EA;
  --silver: #A9B4CF;
  --gold: #FFC24B;
  --paper: #EFE7D8;
  --black: #14161F;

  --line: rgba(169, 180, 207, 0.22);
  --line-strong: rgba(169, 180, 207, 0.42);

  --rail: 78px;
  --topbar: 72px;
  --shell: 1440px;
  --gutter: clamp(20px, 4vw, 56px);
  --radius: 4px;
  --slope: -4deg;

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

  --ease: cubic-bezier(.22, .8, .24, 1);
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(60% 42% at 12% -8%, rgba(255, 106, 26, 0.16), transparent 70%),
    radial-gradient(52% 38% at 88% 2%, rgba(20, 224, 200, 0.14), transparent 72%),
    radial-gradient(70% 55% at 50% 108%, rgba(91, 18, 48, 0.26), transparent 75%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 900; line-height: 1.06; letter-spacing: -.01em; }
h1 { font-size: clamp(40px, 7vw, 104px); }
h2 { font-size: clamp(28px, 4.2vw, 54px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: 18px; font-weight: 500; letter-spacing: .02em; }

::selection { background: var(--orange); color: #180A02; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 2px; }

/* ---------- 4. 版心 / 网格 ---------- */
.shell { width: 100%; max-width: var(--shell); margin-inline: auto; padding-inline: var(--gutter); }
.grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(16px, 2.4vw, 32px); }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }
.measure { max-width: 30ch; }
.flow > * + * { margin-top: 1.15em; }
.flow--tight > * + * { margin-top: .6em; }

main { display: block; }
@media (min-width: 1024px) {
  main { padding-left: var(--rail); }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  padding: 11px 20px;
  font-family: var(--font-head); font-size: 14px; font-weight: 900; letter-spacing: .06em;
  color: var(--white);
  background: rgba(255, 246, 234, 0.04);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn--solid { background: var(--orange); border-color: var(--orange); color: #1A0A02; }
.btn--solid:hover { background: #FF7F3A; border-color: #FF7F3A; }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn--quiet { padding: 8px 0; border: 0; color: var(--cyan); border-bottom: 1px solid rgba(20, 224, 200, .5); border-radius: 0; }
.btn--quiet:hover { color: var(--orange); border-color: var(--orange); }

/* ---------- 6. 标签 / 徽标 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-head); font-size: 12px; font-weight: 900; letter-spacing: .28em;
  color: var(--orange); text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--orange); transform: skewX(-24deg); }

.tag {
  display: inline-flex; align-items: center; gap: .4em;
  padding: 4px 10px; font-size: 12px; letter-spacing: .14em;
  color: var(--silver); border: 1px solid var(--line-strong); border-radius: 2px;
}
.tag--wine { background: var(--wine); border-color: transparent; color: var(--white); }
.tag--cyan { color: var(--cyan); border-color: rgba(20, 224, 200, .45); }
.tag--orange { color: var(--orange); border-color: rgba(255, 106, 26, .5); }
.tag--gold { color: var(--gold); border-color: rgba(255, 194, 75, .5); }

.chip {
  display: inline-flex; align-items: center;
  padding: 4px 10px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em;
  color: var(--silver); border: 1px solid var(--line-strong); border-radius: 2px;
}
.chip--gold { color: var(--gold); border-color: rgba(255, 194, 75, .45); }

/* ---------- 7. 文字组件 ---------- */
.lede { font-size: clamp(18px, 1.6vw, 22px); line-height: 1.65; color: rgba(255, 246, 234, .8); max-width: 46ch; }
.num, .display { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.display { font-weight: 700; line-height: .92; letter-spacing: -.04em; }
.headline-slant { display: inline-block; transform: skewX(-6deg); transform-origin: left bottom; }

.prose { max-width: 38ch; }
.prose > * + * { margin-top: 1.1em; }
.prose p { color: rgba(255, 246, 234, .86); }
.prose h2 { font-size: clamp(26px, 3.4vw, 40px); margin-top: 1.8em; }
.prose h3 { font-size: clamp(20px, 2.2vw, 26px); margin-top: 1.5em; }
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(20, 224, 200, .45); }
.prose a:hover { color: var(--orange); border-color: var(--orange); }
.prose strong { color: var(--white); font-weight: 700; }
.prose ul { padding-left: 1.1em; }
.prose li { position: relative; color: rgba(255, 246, 234, .86); }
.prose ul > li::before {
  content: ""; position: absolute; left: -1.1em; top: .72em;
  width: 6px; height: 6px; background: var(--orange); transform: skewX(-12deg);
}
.prose blockquote {
  border-left: 2px solid var(--orange); padding-left: 1em;
  font-size: 19px; color: rgba(255, 246, 234, .9);
}

/* ---------- 8. 面包屑 ---------- */
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 13px; letter-spacing: .08em; color: var(--silver); }
.crumbs li { display: inline-flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "/"; color: rgba(169, 180, 207, .5); }
.crumbs a:hover { color: var(--cyan); }
.crumbs [aria-current="page"] { color: var(--white); }

/* ---------- 9. 分区与斜切 ---------- */
.section { position: relative; padding-block: clamp(56px, 8vw, 120px); }
.section--indigo { background: var(--indigo); }
.section--teal { background: var(--teal); }
.section--wine { background: var(--wine); }
.section--paper { background: var(--paper); color: var(--black); }
.section--paper .lede,
.section--paper .prose p,
.section--paper .prose li { color: rgba(20, 22, 31, .82); }
.section--paper .prose strong { color: var(--black); }
.section--paper .prose a { color: #8A3A00; border-color: rgba(138, 58, 0, .4); }
.section--paper .eyebrow { color: var(--wine); }
.section--paper .eyebrow::before { background: var(--wine); }
.slant-top { clip-path: polygon(0 clamp(22px, 3.2vw, 54px), 100% 0, 100% 100%, 0 100%); }
.slant-bottom { clip-path: polygon(0 0, 100% 0, 100% calc(100% - clamp(22px, 3.2vw, 54px)), 0 100%); }

/* ---------- 10. 纸张叠层卡片 ---------- */
.stack-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: rgba(27, 27, 71, .72);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: 6px 6px 0 -1px rgba(20, 224, 200, .12), 12px 12px 0 -2px rgba(255, 106, 26, .08);
  transition: background-color .25s var(--ease), box-shadow .25s var(--ease);
}
.stack-card:hover { background: rgba(27, 27, 71, .9); box-shadow: 6px 6px 0 -1px rgba(20, 224, 200, .2), 12px 12px 0 -2px rgba(255, 106, 26, .14); }
.stack-card::before {
  content: ""; position: absolute; left: 0; top: 0; width: 38px; height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--gold));
}

/* ---------- 11. 数据表 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(8, 38, 42, .55);
  -webkit-overflow-scrolling: touch;
}
.data-table { min-width: 640px; font-size: 15px; }
.data-table th, .data-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--line); }
.data-table thead th {
  position: sticky; top: 0; z-index: 2;
  background: #061F23; color: var(--silver);
  font-family: var(--font-head); font-size: 12px; font-weight: 500; letter-spacing: .16em;
}
.data-table tbody tr { transition: background-color .18s var(--ease); }
.data-table tbody tr:hover { background: rgba(20, 224, 200, .07); }
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table .num, .data-table td.is-num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ---------- 12. 图像容器（页面阶段放图） ---------- */
.media {
  position: relative; overflow: hidden; border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(140deg, var(--indigo), var(--teal));
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media__img { width: 100%; height: 100%; object-fit: cover; }
.media__glow {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(45% 40% at 18% 8%, rgba(255, 106, 26, .28), transparent 70%),
    radial-gradient(40% 45% at 86% 88%, rgba(20, 224, 200, .22), transparent 72%);
  mix-blend-mode: screen;
}
.media__tag {
  position: absolute; left: 12px; bottom: 12px;
  padding: 4px 10px; font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  color: var(--white); background: rgba(7, 14, 36, .78); border: 1px solid var(--line-strong); border-radius: 2px;
}
.media__caption { margin-top: 8px; font-size: 13px; color: var(--silver); }

/* ---------- 13. 显现 ---------- */
.has-reveal [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 18px, 0);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
.has-reveal [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 14. 跳至主要内容 ---------- */
.skip-link {
  position: fixed; left: 12px; top: 10px; z-index: 200;
  padding: 10px 16px;
  background: var(--cyan); color: #04201C;
  font-family: var(--font-head); font-size: 14px; font-weight: 900; letter-spacing: .06em;
  border-radius: 3px;
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: none; }

/* ---------- 15. 头部：顶框 + 左侧栏目轨道 ---------- */
.site-header { position: sticky; top: 0; z-index: 80; }

.header-bar {
  position: relative; z-index: 75;
  display: flex; align-items: center; gap: clamp(12px, 2vw, 28px);
  min-height: var(--topbar);
  padding-inline: var(--gutter);
  background:
    linear-gradient(90deg, rgba(255, 106, 26, .12) 0%, rgba(7, 14, 36, 0) 26%),
    linear-gradient(180deg, rgba(7, 14, 36, .96), rgba(7, 14, 36, .88));
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-bar::after {
  content: ""; position: absolute; left: 0; bottom: -1px;
  width: min(180px, 26vw); height: 2px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 106, 26, 0));
}

.brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.brand__mark {
  width: 38px; height: 38px; display: grid; place-items: center;
  font-family: var(--font-head); font-size: 20px; font-weight: 900; color: #1A0A02;
  background: linear-gradient(140deg, var(--orange), var(--gold));
  border-radius: 3px; transform: skewX(-8deg);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__name { font-family: var(--font-head); font-size: 19px; font-weight: 900; letter-spacing: .02em; }
.brand__tag { font-size: 11px; letter-spacing: .18em; color: var(--silver); }

.version-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; color: var(--cyan);
  background: rgba(20, 224, 200, .07);
  border: 1px solid rgba(20, 224, 200, .35); border-radius: 2px;
  white-space: nowrap;
}
.version-chip__pulse {
  width: 6px; height: 6px; border-radius: 50%; background: var(--cyan);
  animation: bs-pulse 2.4s infinite;
}
@keyframes bs-pulse {
  0% { box-shadow: 0 0 0 0 rgba(20, 224, 200, .55); }
  70% { box-shadow: 0 0 0 8px rgba(20, 224, 200, 0); }
  100% { box-shadow: 0 0 0 0 rgba(20, 224, 200, 0); }
}

.header-cta { display: flex; align-items: center; gap: 10px; margin-inline-start: auto; }

.nav-toggle {
  display: none; align-items: center; gap: 8px;
  margin-inline-start: auto;
  padding: 9px 12px;
  font-size: 13px; letter-spacing: .12em; color: var(--white);
  border: 1px solid var(--line-strong); border-radius: 3px;
}
.nav-toggle__bars { position: relative; width: 16px; height: 2px; background: var(--orange); }
.nav-toggle__bars::before,
.nav-toggle__bars::after { content: ""; position: absolute; left: 0; width: 16px; height: 2px; background: var(--orange); }
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle__text { white-space: nowrap; }

/* 左侧轨道 */
.site-nav {
  position: fixed; left: 0; top: var(--topbar); bottom: 0; z-index: 70;
  width: var(--rail);
  display: flex; flex-direction: column; align-items: center; justify-content: space-between;
  padding: 18px 0 22px;
  overflow-y: auto; overflow-x: hidden;
  background: linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 42%, var(--teal) 100%);
  border-right: 1px solid var(--line);
  scrollbar-width: none;
}
.site-nav::-webkit-scrollbar { width: 0; height: 0; }

.site-nav__caption {
  writing-mode: vertical-rl; text-orientation: upright;
  font-size: 11px; letter-spacing: .36em; color: var(--silver); opacity: .75;
  transition: opacity .3s var(--ease);
}
.site-nav__list { display: flex; flex-direction: column; align-items: center; gap: 6px; margin: auto 0; }
.site-nav__item { display: flex; }

.site-nav__link {
  position: relative; display: block;
  writing-mode: vertical-rl; text-orientation: upright;
  padding: 8px 0;
  font-family: var(--font-head); font-size: 12px; font-weight: 900; letter-spacing: .12em;
  color: rgba(255, 246, 234, .74);
  transition: color .22s var(--ease);
}
.site-nav__num { font-family: var(--font-mono); font-weight: 500; font-size: 10px; letter-spacing: .08em; color: var(--orange); }
.site-nav__label { margin-inline-start: .75em; transition: opacity .3s var(--ease); }
.site-nav__link:hover { color: var(--cyan); }
.site-nav__link[aria-current="page"] { color: var(--white); }
.site-nav__link[aria-current="page"]::after {
  content: ""; position: absolute; left: -1px; top: 0; width: 2px; height: 100%;
  background: var(--orange);
}
.site-nav__actions { display: none; }
.site-nav__foot { writing-mode: vertical-rl; text-orientation: upright; font-size: 10px; letter-spacing: .3em; color: var(--silver); opacity: .6; transition: opacity .3s var(--ease); }

/* 滚动后轨道收缩为编号标签 */
.site-header[data-scrolled] .site-nav__label,
.site-header[data-scrolled] .site-nav__caption { opacity: 0; }
.site-header[data-scrolled] .site-nav:hover .site-nav__label,
.site-header[data-scrolled] .site-nav:focus-within .site-nav__label,
.site-header[data-scrolled] .site-nav:hover .site-nav__caption,
.site-header[data-scrolled] .site-nav:focus-within .site-nav__caption { opacity: .9; }

/* 移动端遮罩 */
.nav-scrim {
  position: fixed; inset: 0; z-index: 60;
  background: rgba(4, 8, 20, .74);
  opacity: 0; visibility: hidden;
  transition: opacity .3s var(--ease), visibility .3s var(--ease);
}
.nav-scrim[data-open] { opacity: 1; visibility: visible; }

/* ---------- 16. 页脚 ---------- */
.site-footer { position: relative; background: var(--teal); color: var(--white); border-top: 1px solid var(--line); }
.site-footer::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--cyan) 42%, rgba(20, 224, 200, 0) 100%);
}
.footer-inner {
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr);
  gap: clamp(28px, 4vw, 64px);
  width: 100%; max-width: var(--shell); margin-inline: auto;
  padding: clamp(40px, 6vw, 76px) var(--gutter) clamp(28px, 4vw, 48px);
}
.footer-brand__name { font-family: var(--font-head); font-size: clamp(24px, 3vw, 34px); font-weight: 900; letter-spacing: -.01em; }
.footer-brand__desc { margin-top: 12px; font-size: 15px; color: rgba(255, 246, 234, .72); max-width: 34ch; }
.footer-brand__meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }

.footer-cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(20px, 3vw, 40px); }
.footer-col__title {
  margin-bottom: 14px; padding-bottom: 10px;
  font-family: var(--font-head); font-size: 12px; font-weight: 900; letter-spacing: .24em;
  color: var(--orange);
  border-bottom: 1px solid var(--line);
}
.footer-col__list { display: flex; flex-direction: column; gap: 10px; font-size: 15px; }
.footer-col__list a { color: rgba(255, 246, 234, .78); transition: color .2s var(--ease); }
.footer-col__list a:hover { color: var(--cyan); }

.footer-legal {
  display: flex; flex-direction: column; gap: 10px;
  width: 100%; max-width: var(--shell); margin-inline: auto;
  padding: 20px var(--gutter) 30px;
  border-top: 1px solid var(--line);
  font-size: 13px; color: var(--silver);
}
.footer-legal__links { display: flex; flex-wrap: wrap; gap: 8px 14px; }
.footer-legal__links a {
  padding: 5px 10px; font-size: 12px; letter-spacing: .1em;
  border: 1px solid var(--line-strong); border-radius: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.footer-legal__links a:hover { color: var(--cyan); border-color: rgba(20, 224, 200, .5); }
.footer-contact { letter-spacing: .02em; }
.footer-icp { font-family: var(--font-mono); font-size: 12px; letter-spacing: .04em; }

@media (min-width: 1024px) {
  .site-footer { padding-left: var(--rail); }
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1023px) {
  :root { --topbar: 64px; }

  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-scrim { display: block; }

  .site-nav {
    top: var(--topbar); left: auto; right: 0; bottom: 0;
    width: min(88vw, 420px);
    align-items: stretch; justify-content: flex-start; gap: 18px;
    padding: 26px var(--gutter) 32px;
    background: linear-gradient(180deg, #0B1330 0%, #08262A 100%);
    border-right: 0; border-left: 1px solid var(--line);
    transform: translateX(103%);
    transition: transform .38s var(--ease);
    overflow-y: auto;
  }
  .site-nav[data-open] { transform: none; }

  .site-nav__caption,
  .site-nav__foot {
    writing-mode: horizontal-tb; text-orientation: mixed;
    font-size: 11px; letter-spacing: .28em; opacity: .7;
  }
  .site-header[data-scrolled] .site-nav__caption { opacity: .7; }

  .site-nav__list { align-items: stretch; gap: 0; margin: 0; }
  .site-nav__item { display: block; }
  .site-nav__link {
    display: flex; align-items: baseline; gap: 14px;
    writing-mode: horizontal-tb; text-orientation: mixed;
    padding: 16px 0; font-size: 22px; letter-spacing: .04em;
    border-bottom: 1px solid var(--line);
  }
  .site-nav__link[aria-current="page"]::after { left: auto; right: 0; top: 50%; width: 22px; height: 2px; }
  .site-nav__num { font-size: 12px; }
  .site-nav__label { margin-inline-start: 0; }
  .site-header[data-scrolled] .site-nav__label { opacity: 1; }

  .site-nav__actions { display: flex; flex-direction: column; gap: 10px; margin-top: auto; }
  .site-nav__actions .btn { width: 100%; padding: 13px 18px; font-size: 15px; }

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

@media (max-width: 920px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: span 6; }
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .brand__tag { display: none; }
  .version-chip { display: none; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .footer-legal { align-items: flex-start; }
}

@media (min-width: 1024px) and (max-width: 1180px) {
  :root { --rail: 68px; }
}

/* ---------- 18. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }
  .version-chip__pulse { animation: none; }
  .has-reveal [data-reveal] { opacity: 1; transform: none; }
  .site-nav { transition: none; }
}