/* ============================================================
   /assets/site.css — 完美体育赛事 共享外壳样式
   夜墨绿基调 / 框架式导航 / 精密细线网格 / 等宽索引
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#0D1F1A;
  --ink-deep:#0B1915;
  --graphite:#1B262A;
  --cream:#F1E9D9;
  --brown:#241E1B;
  --cyan:#3FE0CE;
  --cyan-soft:rgba(63,224,206,.10);
  --orange:#E4752B;
  --blue:#3F6280;
  --line:#2C4640;
  --text:#C6D1CC;
  --mist:#8A9A95;
  --font-sans:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --rail-w:212px;
  --bar-h:64px;
  --edge:clamp(16px,4vw,40px);
  --wrap:1280px;
  --gap:24px;
  --ease:cubic-bezier(.2,.7,.2,1);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  background:var(--ink);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
body{
  margin:0;
  background:transparent;
  color:var(--text);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
/* 全站精密网格底纹 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(44,70,64,.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(44,70,64,.32) 1px, transparent 1px);
  background-size:104px 104px;
  opacity:.55;
}
img,svg,video{max-width:100%;height:auto;display:block}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure,table{margin:0}
ul,ol{padding:0}
a{color:inherit}
hr{border:0;height:1px;background:var(--line)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}
[hidden]{display:none !important}

/* ---------- 3. 排版工具 ---------- */
.mono,.index-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
  margin:0 0 18px;
}
.eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:var(--cyan);
  display:block;
}
.dot{
  display:inline-block;
  width:7px;height:7px;
  border-radius:50%;
  background:var(--orange);
  margin-right:8px;
  vertical-align:middle;
  animation:pulse 2.4s var(--ease) infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}

/* ---------- 4. 跳转链接 / 进度条 ---------- */
.skip-link{
  position:absolute;
  left:12px;
  top:-64px;
  z-index:140;
  padding:10px 16px;
  background:var(--cyan);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:10px}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--blue));
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .12s linear;
  pointer-events:none;
}

/* ---------- 5. 页头框架 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:linear-gradient(180deg,rgba(13,31,26,.99),rgba(13,31,26,.92));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(8px);
}
.header-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  height:var(--bar-h);
  padding:0 var(--edge);
}
.brand{display:flex;align-items:center;min-width:0}
.brand__link{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  min-width:0;
}
.brand__mark{
  flex:0 0 auto;
  width:22px;
  height:28px;
  background:linear-gradient(180deg,var(--cyan) 0 62%,var(--blue) 62% 100%);
  clip-path:polygon(0 0,100% 0,100% 66%,0 100%);
}
.brand__text{display:block;min-width:0}
.brand__name{
  display:block;
  font-size:17px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--cream);
  line-height:1.25;
}
.brand__line{
  display:block;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:var(--mist);
  line-height:1.4;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.header-bar__meta{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}
.header-bar__stamp{
  display:inline-flex;
  align-items:center;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
  border-left:1px solid var(--line);
  padding-left:14px;
}

/* ---------- 6. 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  border:1px solid var(--line);
  border-radius:0;
  background:transparent;
  color:var(--cream);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--primary{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink);
  font-weight:700;
}
.btn--primary:hover{background:#66ecdc;border-color:#66ecdc;color:var(--ink)}
.btn--ghost:hover{color:var(--cyan)}
.btn--sm{padding:7px 12px;font-size:11px;letter-spacing:.1em}

/* ---------- 7. 导航开关 ---------- */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 12px;
  border:1px solid var(--line);
  border-radius:0;
  background:transparent;
  color:var(--cream);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{
  display:block;
  width:16px;
  height:2px;
  background:var(--cyan);
  box-shadow:0 -5px 0 var(--cyan),0 5px 0 var(--cyan);
}
.nav-toggle__label{display:block}

/* ---------- 8. 主导航：桌面竖向框架导轨 ---------- */
.site-nav{
  position:fixed;
  top:var(--bar-h);
  left:0;
  bottom:0;
  width:var(--rail-w);
  z-index:85;
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:30px 20px 22px;
  background:linear-gradient(180deg,#0D1F1A 0%,#0F211C 62%,#0E1D19 100%);
  border-right:1px solid var(--line);
  scrollbar-width:none;
}
.site-nav::-webkit-scrollbar{display:none}
.site-nav__title{margin:0 0 12px;padding-left:12px}
.site-nav__list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:2px;
  counter-reset:navidx;
}
.site-nav__list li{counter-increment:navidx}
.site-nav__list a{
  position:relative;
  display:flex;
  align-items:center;
  gap:10px;
  padding:11px 12px;
  color:var(--text);
  font-size:15px;
  letter-spacing:.02em;
  text-decoration:none;
  border:1px solid transparent;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.site-nav__list a::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.08em;
  color:var(--mist);
}
.site-nav__list a::after{
  content:"";
  position:absolute;
  left:0;
  top:9px;
  bottom:9px;
  width:2px;
  background:transparent;
  transition:background .2s var(--ease);
}
.site-nav__list a:hover{color:var(--cream);background:var(--cyan-soft)}
.site-nav__list a[aria-current="page"]{
  color:var(--cream);
  background:rgba(63,224,206,.09);
}
.site-nav__list a[aria-current="page"]::after{background:var(--cyan)}
.site-nav__foot{
  margin:auto 0 0;
  padding-top:16px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:var(--mist);
  line-height:1.9;
}

/* 内容让位给框架导轨（桌面） */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .site-header{padding-left:var(--rail-w)}
}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  position:relative;
  z-index:2;
  margin-top:0;
  background:linear-gradient(180deg,rgba(11,25,21,.6),#0B1915 40%);
  border-top:1px solid var(--line);
  color:var(--text);
}
.footer-frame{
  width:min(var(--wrap),100% - (var(--edge) * 2));
  margin:0 auto;
  padding:clamp(40px,5vw,64px) 0 clamp(24px,3vw,36px);
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.15fr;
  gap:clamp(24px,4vw,48px);
}
.footer-brand__name{
  font-size:20px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--cream);
}
.footer-brand__line{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--cyan);
  text-transform:uppercase;
}
.footer-brand__note{
  margin-top:16px;
  max-width:36ch;
  font-size:14px;
  line-height:1.85;
  color:var(--mist);
}
.footer-col__title{
  margin:0 0 16px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:9px;
  font-size:15px;
}
.footer-list a{
  color:var(--text);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-list a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-list--split li{display:flex;justify-content:space-between;gap:10px}
.footer-round{
  border:1px solid var(--line);
  padding:16px 16px 18px;
  background:rgba(27,38,42,.6);
}
.footer-round__label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--mist);
}
.footer-round__value{
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:26px;
  line-height:1.1;
  letter-spacing:0;
  color:var(--cyan);
}
.footer-round__note{
  margin-top:10px;
  font-size:13px;
  line-height:1.75;
  color:var(--mist);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding:22px 0 clamp(28px,4vw,40px);
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
}
.footer-legal__links{display:flex;align-items:center;gap:8px}
.footer-legal__links a{
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-legal__links a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-legal__sep{color:var(--line)}
.footer-contact{line-height:1.8}
.footer-copy{line-height:1.8}

/* ---------- 10. 回到顶部 ---------- */
.to-top{
  position:fixed;
  right:var(--edge);
  bottom:calc(var(--edge) + 4px);
  z-index:88;
  width:auto;
  padding:11px 16px;
  border:1px solid var(--line);
  border-radius:0;
  background:var(--graphite);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  cursor:pointer;
  opacity:0;
  transform:translateY(8px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),border-color .2s var(--ease);
}
.to-top[data-visible]{opacity:1;transform:translateY(0)}
.to-top:hover{border-color:var(--cyan)}

/* ---------- 11. 布局工具 ---------- */
.wrap{
  width:min(var(--wrap),100% - (var(--edge) * 2));
  margin-inline:auto;
}
.section{
  position:relative;
  padding:clamp(44px,7vw,84px) 0;
}
.section--graphite{background:var(--graphite)}
.section--cream{
  background:var(--cream);
  color:var(--brown);
  border-top:1px solid rgba(36,30,27,.14);
  border-bottom:1px solid rgba(36,30,27,.14);
}
.section--cream .index-label,
.section--cream .eyebrow{color:var(--blue)}
.section--cream .eyebrow::before{background:var(--orange)}
.section__head{max-width:62ch;margin-bottom:clamp(24px,3vw,40px)}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.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-9{grid-column:span 9}
.col-12{grid-column:span 12}
.rail{display:flex;flex-direction:column;gap:20px;min-width:0}
.rail--sticky{position:sticky;top:calc(var(--bar-h) + 24px)}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* ---------- 12. 面板 / 数据卡 ---------- */
.panel{
  position:relative;
  background:var(--graphite);
  border:1px solid var(--line);
  border-radius:0;
  padding:clamp(18px,2.6vw,30px);
}
.panel--cream{
  background:var(--cream);
  border-color:rgba(36,30,27,.16);
  color:var(--brown);
}
.panel--cream h2,.panel--cream h3,.panel--cream strong{color:var(--brown)}
.panel__cut{
  position:absolute;
  top:-1px;
  right:-1px;
  width:38px;
  height:38px;
  background:var(--cyan);
  clip-path:polygon(100% 0,100% 100%,0 0);
}
.panel--cream .panel__cut{background:var(--orange)}

.stat-row{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.stat{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:18px 18px 20px;
  background:var(--graphite);
}
.section--cream .stat{background:transparent}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(30px,5vw,46px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--cyan);
}
.section--cream .stat__value{color:#1E5D55}
.stat__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--mist);
}
.section--cream .stat__label{color:#6C625A}

.meter{
  position:relative;
  height:10px;
  border-radius:2px;
  background:rgba(44,70,64,.65);
  overflow:hidden;
}
.section--cream .meter{background:rgba(36,30,27,.12)}
.meter__fill{
  display:block;
  height:100%;
  width:0;
  border-radius:2px;
  background:linear-gradient(90deg,var(--cyan),var(--blue));
  transition:width .6s var(--ease);
}
.meter--warn .meter__fill{background:linear-gradient(90deg,var(--orange),var(--blue))}

/* ---------- 13. 筛选 / 标签 ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:0;
  background:transparent;
  color:var(--text);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.chip:hover{border-color:var(--cyan);color:var(--cream)}
.chip[aria-pressed="true"],
.chip.is-active{
  background:rgba(63,224,206,.14);
  border-color:var(--cyan);
  color:var(--cyan);
}
.section--cream .chip{border-color:rgba(36,30,27,.25);color:#3B332E}
.section--cream .chip[aria-pressed="true"],
.section--cream .chip.is-active{
  background:rgba(63,98,128,.14);
  border-color:var(--blue);
  color:#1F3A4A;
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  text-transform:uppercase;
  border:1px solid var(--line);
  color:var(--mist);
}
.tag--warn{border-color:var(--orange);color:var(--orange)}
.tag--live{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 14. 章节索引 ---------- */
.section-index{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:2px;
  margin:0;
  padding:0;
  border-left:1px solid var(--line);
}
.section-index__link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:9px 12px;
  color:var(--mist);
  font-size:14px;
  text-decoration:none;
  border-left:2px solid transparent;
  margin-left:-1px;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.section-index__link:hover{color:var(--cream);background:var(--cyan-soft)}
.section-index__link.is-active{
  color:var(--cyan);
  border-left-color:var(--cyan);
  background:rgba(63,224,206,.08);
}
.section-index__num{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  color:inherit;
  opacity:.75;
}

/* ---------- 15. 面包屑 / 正文 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
  margin:0 0 26px;
  padding:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--line)}
.breadcrumb a{
  color:var(--mist);
  text-decoration:none;
  transition:color .2s var(--ease);
}
.breadcrumb a:hover{color:var(--cyan)}
.section--cream .breadcrumb,
.section--cream .breadcrumb a{color:#7A6F66}
.section--cream .breadcrumb a:hover{color:#1E5D55}

.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.9;
  color:var(--text);
}
.prose h2{
  margin:2.1em 0 .6em;
  font-size:clamp(22px,2.6vw,30px);
  line-height:1.3;
  letter-spacing:-.01em;
  color:var(--cream);
}
.prose h3{
  margin:1.8em 0 .5em;
  font-size:19px;
  line-height:1.4;
  color:var(--cream);
}
.prose h2:first-child,.prose h3:first-child{margin-top:0}
.prose p{margin:0 0 1.1em}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.3em}
.prose li{margin:.35em 0}
.prose strong{color:var(--cream)}
.prose a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(63,224,206,.4);
}
.prose--cream{color:#3B332E}
.prose--cream h2,.prose--cream h3,.prose--cream strong{color:var(--brown)}
.prose--cream a{color:#1E5D55;border-bottom-color:rgba(30,93,85,.4)}

/* ---------- 16. 表格 ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line)}
.data-table{
  width:100%;
  border-collapse:collapse;
  font-size:15px;
  min-width:520px;
}
.data-table th,
.data-table td{
  text-align:left;
  padding:13px 16px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.data-table th{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table--num td{font-family:var(--font-mono);letter-spacing:0}
.section--cream .table-wrap{border-color:rgba(36,30,27,.18)}
.section--cream .data-table th,
.section--cream .data-table td{border-bottom-color:rgba(36,30,27,.14);color:#3B332E}

/* ---------- 17. 折叠问答 ---------- */
.faq{border-top:1px solid var(--line)}
.faq__item{border-bottom:1px solid var(--line)}
.faq__q{
  display:flex;
  align-items:flex-start;
  gap:14px;
  padding:18px 4px;
  font-size:17px;
  color:var(--cream);
  cursor:pointer;
  list-style:none;
}
.faq__q::-webkit-details-marker{display:none}
.faq__q::before{
  content:"+";
  font-family:var(--font-mono);
  font-size:16px;
  line-height:1.5;
  color:var(--cyan);
  flex:0 0 auto;
}
.faq__item[open] .faq__q::before{content:"—";color:var(--orange)}
.faq__a{
  padding:0 4px 20px 30px;
  font-size:16px;
  line-height:1.85;
  color:var(--text);
  max-width:70ch;
}
.section--cream .faq,.section--cream .faq__item{border-color:rgba(36,30,27,.16)}
.section--cream .faq__q{color:var(--brown)}
.section--cream .faq__a{color:#3B332E}

/* ---------- 18. 图片容器 ---------- */
.figure{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--graphite);
  border:1px solid var(--line);
}
.figure::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(63,224,206,.10) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(63,224,206,.08) 1px, transparent 1px);
  background-size:64px 64px;
}
.figure__img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.55) contrast(1.08) brightness(.85);
}
.figure__cap{
  position:absolute;
  left:0;
  bottom:0;
  padding:8px 12px;
  background:rgba(13,31,26,.82);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:var(--mist);
}
.figure--16x9{aspect-ratio:16 / 9}
.figure--4x3{aspect-ratio:4 / 3}
.figure--1x1{aspect-ratio:1 / 1}
.figure--wide{aspect-ratio:21 / 9}

/* ---------- 19. 锚点偏移 ---------- */
#main-content,
[id][data-section],
.section[id]{scroll-margin-top:calc(var(--bar-h) + 20px)}

/* ============================================================
   20. 响应式：平板与移动
   ============================================================ */
@media (max-width:1023px){
  :root{--bar-h:58px}
  .nav-toggle{display:inline-flex}
  .header-bar__stamp{display:none}
  .site-header{padding-left:0}
  body{padding-left:0;padding-bottom:calc(62px + env(safe-area-inset-bottom))}

  /* 底部固定索引条 */
  .site-nav{
    position:fixed;
    top:auto;
    bottom:0;
    left:0;
    right:0;
    width:auto;
    border-right:0;
    border-top:1px solid var(--line);
    background:#0F211C;
    flex-direction:row;
    align-items:stretch;
    gap:0;
    padding:0 0 env(safe-area-inset-bottom);
    overflow-x:auto;
    overflow-y:hidden;
    transition:transform .3s var(--ease);
  }
  .site-nav__title{display:none}
  .site-nav__list{
    flex-direction:row;
    flex:1 0 auto;
    gap:0;
    counter-reset:navidx;
  }
  .site-nav__list li{flex:1 1 0;min-width:62px}
  .site-nav__list a{
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:3px;
    padding:9px 6px 8px;
    font-size:11px;
    letter-spacing:0;
    text-align:center;
    white-space:nowrap;
    height:100%;
  }
  .site-nav__list a::before{font-size:9px;line-height:1;letter-spacing:.06em}
  .site-nav__list a::after{
    left:22%;
    right:22%;
    top:auto;
    bottom:0;
    width:auto;
    height:2px;
  }
  .site-nav__foot{display:none}

  /* 展开态：全屏索引层 */
  .site-nav[data-open]{
    top:var(--bar-h);
    bottom:0;
    flex-direction:column;
    overflow-y:auto;
    padding:24px var(--edge) calc(40px + env(safe-area-inset-bottom));
    background:linear-gradient(180deg,#0D1F1A,#0F211C);
  }
  .site-nav[data-open] .site-nav__title{display:block;padding-left:12px;margin-bottom:10px}
  .site-nav[data-open] .site-nav__list{flex-direction:column;flex:1 1 auto;gap:2px}
  .site-nav[data-open] .site-nav__list li{flex:0 0 auto;min-width:0}
  .site-nav[data-open] .site-nav__list a{
    flex-direction:row;
    align-items:center;
    justify-content:flex-start;
    gap:14px;
    padding:16px 12px;
    font-size:21px;
    letter-spacing:.02em;
  }
  .site-nav[data-open] .site-nav__list a::before{font-size:11px}
  .site-nav[data-open] .site-nav__list a::after{
    left:0;
    right:auto;
    top:12px;
    bottom:12px;
    width:2px;
    height:auto;
  }
  .site-nav[data-open] .site-nav__foot{display:block;margin-top:26px}
  html[data-nav-open]{overflow:hidden}

  .to-top{bottom:calc(78px + env(safe-area-inset-bottom))}

  .footer-frame{grid-template-columns:1fr 1fr}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

@media (max-width:760px){
  body{font-size:16px;line-height:1.8}
  .col-3,.col-4,.col-6,.col-8,.col-9,.col-12{grid-column:span 12}
  .grid-12{gap:20px}
  .rail--sticky{position:static}
  .stat-row{grid-template-columns:repeat(2,minmax(0,1fr))}
  .prose{font-size:16px}
}

@media (max-width:560px){
  .btn--ghost{display:none}
  .brand__line{max-width:52vw}
  .header-bar{gap:10px}
  .btn{padding:9px 13px;font-size:11px;letter-spacing:.08em}
  .footer-frame{grid-template-columns:1fr;gap:28px}
  .footer-legal{font-size:11px}
  .stat-row{grid-template-columns:1fr}
  .figure--wide{aspect-ratio:16 / 9}
}

/* ---------- 21. 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .scroll-progress{transition:none}
  .to-top{transition:none}
  .meter__fill{transition:none}
}