/* 8868赛场 · 共享样式 /assets/site.css */

/* ---------- 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,h6,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

/* ---------- 2. Tokens ---------- */
:root{
  --bg:#071A16;
  --bg-deep:#05100E;
  --panel:#0F1414;
  --panel-soft:#12201C;
  --rail-bg:#0A1512;
  --brown:#1B1512;
  --cream:#F1E7D6;
  --cream-ink:#121210;
  --cyan:#4CE0B3;
  --orange:#FF7A29;
  --amber:#FFC24B;
  --red:#D94A3D;
  --text:#E9F2EE;
  --muted:#8FA69E;
  --line:#24413A;
  --rail-w:104px;
  --strip-h:52px;
  --bar-h:60px;
  --cut:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-display:"Archivo Narrow","Oswald","Roboto Condensed","Arial Narrow","PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- 3. Base ---------- */
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  padding-top:var(--bar-h);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(58% 42% at 78% 3%,rgba(76,224,179,.10),transparent 68%),
    radial-gradient(46% 36% at 8% 84%,rgba(255,122,41,.09),transparent 72%),
    radial-gradient(90% 70% at 50% 118%,rgba(15,20,20,.92),transparent 72%);
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.18;color:var(--text)}
h1{font-size:clamp(38px,6vw,76px);line-height:1.06;letter-spacing:-.01em}
h2{font-size:clamp(26px,3.4vw,44px);line-height:1.14}
h3{font-size:clamp(19px,2vw,24px);font-weight:600;line-height:1.36}
h4{font-size:18px;font-weight:600;line-height:1.4}
p{max-width:64ch}
.mono,.data-num,.nav-link__idx,.timeline__time,time{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:var(--orange);color:var(--cream-ink)}

/* ---------- 4. 切角形状总表 ---------- */
.cut,.card,.media-frame,.btn,.nav-toggle,.skip-link,.status-tag,.tag,.tab,.accordion__item{
  clip-path:polygon(0 0,calc(100% - var(--cut,14px)) 0,100% var(--cut,14px),100% 100%,var(--cut,14px) 100%,0 calc(100% - var(--cut,14px)));
}

/* ---------- 5. 布局容器 ---------- */
.wrap{width:100%;max-width:1240px;margin-inline:auto;padding-inline:20px}
.section{position:relative;padding-block:clamp(56px,8vh,116px)}
.section--tight{padding-block:clamp(36px,5vh,68px)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:14px 32px;margin-bottom:clamp(26px,4vw,50px);
}
.section__head p{font-size:15px;color:var(--muted);max-width:52ch}
.eyebrow{font:600 12px/1 var(--font-mono);letter-spacing:.28em;text-transform:uppercase;color:var(--cyan)}

.grid{display:grid;gap:20px}
.grid--2,.grid--3,.grid--main{grid-template-columns:1fr}
@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1080px){
  .grid{gap:24px}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--main{grid-template-columns:minmax(0,8fr) minmax(0,4fr);gap:40px}
  .wrap{padding-inline:40px}
}

/* ---------- 6. 章节体系 ---------- */
.chapter{display:flex;gap:16px;align-items:flex-start}
.chapter__num{
  flex:0 0 auto;min-width:1.1em;
  font:700 clamp(44px,6vw,96px)/.85 var(--font-display);
  letter-spacing:-.02em;color:rgba(76,224,179,.20);
  transition:color 300ms var(--ease);
}
.chapter:hover .chapter__num{color:rgba(76,224,179,.38)}
.chapter__body{flex:1 1 auto;min-width:0;display:grid;gap:6px}
.chapter__kicker{font:600 12px/1 var(--font-mono);letter-spacing:.2em;color:var(--muted);text-transform:uppercase}
.chapter__title{font-family:var(--font-display);font-size:clamp(20px,2.4vw,30px);font-weight:700;line-height:1.26}

/* ---------- 7. 面板与卡片 ---------- */
.card{
  position:relative;padding:24px;
  background:linear-gradient(160deg,rgba(18,32,28,.96),rgba(15,20,20,.98));
  box-shadow:inset 0 0 0 1px var(--line);
  transition:transform 160ms var(--ease),box-shadow 160ms var(--ease);
}
.card:hover{transform:translateY(-2px);box-shadow:inset 0 0 0 1px var(--cyan)}
.card__title{font-family:var(--font-display);font-size:20px;font-weight:700;line-height:1.3}
.card__meta{font:500 12px/1.6 var(--font-mono);letter-spacing:.06em;color:var(--muted)}
.card--cream{background:var(--cream);color:var(--cream-ink);box-shadow:inset 0 0 0 1px var(--brown)}
.card--cream .card__title,.card--cream h3,.card--cream h2{color:var(--cream-ink)}
.card--cream .card__meta,.card--cream p{color:#4A423A}

/* ---------- 8. 数据与时间轴 ---------- */
.data-num{font-weight:600;letter-spacing:-.01em}
.data-num--xl{display:block;font-size:clamp(30px,4vw,46px);line-height:1;color:var(--cyan)}
.data-num--amber{color:var(--amber)}
.data-num--orange{color:var(--orange)}
.timeline{position:relative;padding-left:24px}
.timeline::before{content:"";position:absolute;left:5px;top:8px;bottom:8px;width:1px;background:var(--line)}
.timeline__item{position:relative;padding-block:14px}
.timeline__item::before{
  content:"";position:absolute;left:-24px;top:22px;width:11px;height:11px;border-radius:50%;
  background:var(--bg);box-shadow:inset 0 0 0 2px var(--line);
  transition:box-shadow 400ms var(--ease),background-color 400ms var(--ease);
}
.timeline__item.is-visible::before{background:var(--cyan);box-shadow:inset 0 0 0 2px var(--cyan)}
.timeline__time{display:block;font-size:13px;font-weight:600;letter-spacing:.04em;color:var(--amber)}
.timeline__title{margin-top:6px;font-size:16px;font-weight:600;line-height:1.5}
.timeline__text{margin-top:4px;font-size:14px;line-height:1.8;color:var(--muted);max-width:56ch}

/* ---------- 9. 标签与按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;
  font:600 14px/1 var(--font-sans);letter-spacing:.06em;
  color:var(--cream-ink);background:var(--orange);
  transition:background-color 160ms var(--ease),color 160ms var(--ease),box-shadow 160ms var(--ease),transform 160ms var(--ease);
}
.btn:hover{background:#FF8F4D}
.btn:active{transform:translateY(1px)}
.btn--sm{padding:8px 13px;font-size:12px}
.btn--ghost{color:var(--cyan);background:transparent;box-shadow:inset 0 0 0 1px var(--line)}
.btn--ghost:hover{color:var(--cyan);background:rgba(76,224,179,.10);box-shadow:inset 0 0 0 1px var(--cyan)}
.tag{
  --cut:8px;
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;font:500 12px/1.5 var(--font-sans);letter-spacing:.06em;
  color:var(--text);background:rgba(36,65,58,.45);box-shadow:inset 0 0 0 1px var(--line);
}
.tag--cyan{color:var(--cyan)}
.tag--amber{color:var(--amber)}
.tag--orange{color:var(--orange)}
.status-tags{display:flex;flex-wrap:wrap;gap:6px}
.status-tag{
  --cut:8px;
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 10px;
  font:500 11px/1.4 var(--font-sans);letter-spacing:.06em;
  color:var(--muted);background:rgba(36,65,58,.32);
  box-shadow:inset 0 0 0 1px var(--line);
  transition:color 160ms var(--ease),background-color 160ms var(--ease),box-shadow 160ms var(--ease);
}
.status-tag::before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor;flex:0 0 auto}
.status-tag:hover{color:var(--text);background:rgba(76,224,179,.12);box-shadow:inset 0 0 0 1px var(--cyan)}
.status-tag--red::before{background:var(--red);box-shadow:0 0 8px rgba(217,74,61,.8)}
.status-tag--amber::before{background:var(--amber)}
.status-tag--cyan::before{background:var(--cyan)}
.btn:focus-visible,.status-tag:focus-visible,.nav-toggle:focus-visible,.skip-link:focus-visible{
  outline:none;box-shadow:inset 0 0 0 2px var(--cyan);
}

/* ---------- 10. 正文、注释、面包屑 ---------- */
.prose{max-width:70ch;font-size:17px}
.prose p+p{margin-top:1.2em}
.prose h2{margin-top:1.6em;margin-bottom:.5em}
.prose h3{margin-top:1.4em;margin-bottom:.5em}
.prose ul{display:grid;gap:10px;margin-top:1em}
.prose ul li{position:relative;padding-left:20px}
.prose ul li::before{content:"";position:absolute;left:0;top:.78em;width:10px;height:1px;background:var(--cyan)}
.prose blockquote{
  margin-top:1.4em;padding:20px 22px;
  background:var(--cream);color:var(--cream-ink);
  box-shadow:inset 0 0 0 1px var(--brown);
}
.prose blockquote p{max-width:none}
.prose a{color:var(--cyan);box-shadow:inset 0 -1px 0 var(--line);transition:box-shadow 160ms var(--ease)}
.prose a:hover{box-shadow:inset 0 -2px 0 var(--cyan)}
.anno{font-size:12px;line-height:1.7;letter-spacing:.08em;color:var(--muted)}
.anno--vertical{writing-mode:vertical-rl;letter-spacing:.24em}
.anno--side{position:absolute;right:-6px;top:0;transform:rotate(90deg);transform-origin:right top}
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding-block:10px;font-size:13px;color:var(--muted)}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--line)}
.breadcrumbs a{transition:color 160ms var(--ease)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--text)}

/* ---------- 11. 图片容器基础 ---------- */
.media-frame{
  position:relative;overflow:hidden;aspect-ratio:16/10;
  background:
    radial-gradient(70% 90% at 20% 8%,rgba(76,224,179,.16),transparent 66%),
    radial-gradient(60% 80% at 86% 92%,rgba(255,122,41,.14),transparent 70%),
    linear-gradient(150deg,#0C1B17,#0F1414);
  box-shadow:inset 0 0 0 1px var(--line);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame__caption{
  position:absolute;left:14px;right:14px;bottom:12px;
  font-size:12px;letter-spacing:.08em;color:var(--muted);
}

/* ---------- 12. 显现动画 ---------- */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity 600ms var(--ease),transform 600ms var(--ease)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 13. 视图切换与折叠面板 ---------- */
.tabs{display:block}
.tabs__list{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px}
.tab{
  --cut:10px;
  padding:9px 16px;
  font:600 13px/1 var(--font-sans);letter-spacing:.08em;
  color:var(--muted);background:rgba(36,65,58,.28);
  box-shadow:inset 0 0 0 1px var(--line);
  transition:color 160ms var(--ease),background-color 160ms var(--ease),box-shadow 160ms var(--ease);
}
.tab:hover{color:var(--text);background:rgba(76,224,179,.12)}
.tab[aria-selected="true"]{color:var(--cream-ink);background:var(--cyan);box-shadow:inset 0 0 0 1px var(--cyan)}
.tab:focus-visible{outline:none;box-shadow:inset 0 0 0 2px var(--cyan)}
.tabpanel{padding-top:4px}
.accordion{display:grid;gap:10px}
.accordion__item{background:var(--panel);box-shadow:inset 0 0 0 1px var(--line)}
.accordion__trigger{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  width:100%;padding:16px 18px;text-align:left;
  font:600 16px/1.5 var(--font-sans);color:var(--text);
  transition:background-color 160ms var(--ease);
}
.accordion__trigger:hover{background:rgba(76,224,179,.07)}
.accordion__trigger::after{
  content:"";flex:0 0 auto;width:9px;height:9px;
  border-right:2px solid var(--cyan);border-bottom:2px solid var(--cyan);
  transform:rotate(45deg) translate(-2px,-2px);
  transition:transform 200ms var(--ease);
}
.accordion__trigger[aria-expanded="true"]::after{transform:rotate(-135deg) translate(-2px,-2px)}
.accordion__panel{padding:0 18px 18px;font-size:15px;line-height:1.85;color:var(--muted)}

/* ---------- 14. Header ---------- */
.site-header{position:fixed;top:0;left:0;right:0;height:var(--bar-h);z-index:80;pointer-events:none}
.skip-link{
  position:absolute;top:8px;left:8px;z-index:120;
  transform:translateY(-220%);pointer-events:auto;
  padding:12px 16px;
  font:600 14px/1 var(--font-sans);letter-spacing:.06em;
  background:var(--amber);color:var(--cream-ink);
  transition:transform 160ms var(--ease);
}
.skip-link:focus{transform:translateY(0)}
.rail{
  pointer-events:auto;position:absolute;top:0;left:0;right:0;
  height:var(--bar-h);display:flex;align-items:center;
  padding:0 14px;
  background:linear-gradient(90deg,#0A1512 0%,#081613 68%,rgba(7,26,22,.96) 100%);
  border-bottom:1px solid var(--line);
}
.rail-head{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%}
.brand{display:flex;align-items:baseline;gap:8px}
.brand__mark{font:600 16px/1 var(--font-mono);letter-spacing:.08em;color:var(--cyan)}
.brand__cn{font:700 17px/1 var(--font-sans);letter-spacing:.22em;color:var(--text)}
.nav-toggle{
  display:inline-flex;align-items:center;gap:8px;padding:10px 12px;
  color:var(--text);box-shadow:inset 0 0 0 1px var(--line);
  transition:background-color 160ms var(--ease),box-shadow 160ms var(--ease);
}
.nav-toggle:hover{background:rgba(76,224,179,.10);box-shadow:inset 0 0 0 1px var(--cyan)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px}
.nav-toggle__bars i{display:block;height:2px;background:var(--cyan);transition:transform 180ms var(--ease),opacity 180ms var(--ease)}
.nav-toggle__text{font:600 12px/1 var(--font-sans);letter-spacing:.14em;color:var(--muted)}
.site-header[data-open="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.site-nav{
  pointer-events:auto;position:fixed;top:var(--bar-h);left:0;bottom:0;z-index:90;
  width:min(320px,84vw);display:flex;flex-direction:column;gap:14px;
  padding:24px 18px 30px;overflow-y:auto;
  background:linear-gradient(180deg,#0B1614,#06110F);
  border-right:1px solid var(--line);
  box-shadow:30px 0 70px -40px #000;
  transform:translateX(-104%);
  transition:transform 240ms var(--ease);
}
.site-header[data-open="true"] .site-nav{transform:translateX(0)}
.site-nav__label{font:600 11px/1 var(--font-sans);letter-spacing:.3em;color:var(--muted);padding-bottom:10px;border-bottom:1px solid var(--line)}
.site-nav__list{display:flex;flex-direction:column;gap:2px}
.nav-link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:13px 12px;color:var(--muted);
  transition:color 160ms var(--ease),background-color 160ms var(--ease);
}
.nav-link::before{content:"";position:absolute;left:0;top:8px;bottom:8px;width:2px;background:transparent;transition:background-color 160ms var(--ease)}
.nav-link:hover{color:var(--text);background:rgba(76,224,179,.06)}
.nav-link:hover::before{background:var(--line)}
.nav-link[aria-current="page"]{color:var(--text);background:rgba(76,224,179,.10)}
.nav-link[aria-current="page"]::before{background:var(--cyan)}
.nav-link__idx{font-size:11px;letter-spacing:.1em;color:var(--muted)}
.nav-link[aria-current="page"] .nav-link__idx{color:var(--orange)}
.nav-link__text{font-size:16px;font-weight:500;letter-spacing:.04em;line-height:1.25;writing-mode:horizontal-tb}
.nav-tools{margin-top:auto;display:flex;flex-direction:column;gap:10px;padding-top:16px;border-top:1px solid var(--line)}
.nav-tools__title{font:600 11px/1 var(--font-sans);letter-spacing:.24em;color:var(--muted)}
.nav-tools .status-tags{flex-direction:column;align-items:stretch}
.nav-tools__switch{width:100%}
.utility-strip{display:none}
.nav-scrim{
  position:fixed;top:var(--bar-h);left:0;right:0;bottom:0;z-index:85;
  background:rgba(4,12,10,.72);opacity:0;pointer-events:none;
  transition:opacity 200ms var(--ease);
}
.site-header[data-open="true"] .nav-scrim{opacity:1;pointer-events:auto}

/* ---------- 15. Footer ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(72px,10vh,140px);
  background:linear-gradient(180deg,#081713 0%,#0B1512 46%,#0F1414 100%);
  border-top:1px solid var(--line);
}
.rule-diagonal{
  height:10px;
  background:linear-gradient(90deg,rgba(76,224,179,.35),rgba(255,122,41,.45) 58%,rgba(76,224,179,0));
  transform:skewY(-8deg);transform-origin:left center;
}
.footer-trail{position:relative;height:64px;border-bottom:1px solid var(--line);background:radial-gradient(70% 150% at 12% 0%,rgba(76,224,179,.10),transparent 70%)}
.footer-trail svg{width:100%;height:100%}
.footer-trail path{fill:none;stroke:var(--cyan);stroke-width:1.2;stroke-dasharray:8 10;opacity:.5}
.footer-trail circle{fill:var(--orange)}
.footer-inner{
  width:100%;max-width:1240px;margin-inline:auto;
  padding:48px 20px 32px;
  display:grid;gap:36px 32px;grid-template-columns:1fr;
}
.footer-brand__mark{font:700 26px/1.1 var(--font-display);letter-spacing:.04em;color:var(--text)}
.footer-brand__mark span{color:var(--cyan)}
.footer-brand__line{margin-top:10px;font-size:14px;color:var(--muted)}
.footer-brand__note{margin-top:14px;font-size:13px;line-height:1.9;color:var(--muted);max-width:36em}
.footer-col__title{
  font-family:var(--font-sans);font-size:12px;font-weight:600;line-height:1.4;
  letter-spacing:.24em;color:var(--amber);
  padding-bottom:12px;margin-bottom:14px;border-bottom:1px solid var(--line);
}
.footer-col__list{display:flex;flex-direction:column;gap:10px}
.footer-col__list a{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;color:var(--text);opacity:.9;
  transition:color 160ms var(--ease);
}
.footer-col__list a::before{content:"";width:10px;height:1px;background:var(--line);transition:width 160ms var(--ease),background-color 160ms var(--ease)}
.footer-col__list a:hover{color:var(--cyan)}
.footer-col__list a:hover::before{width:18px;background:var(--cyan)}
.footer-contact__row{font-size:13px;line-height:1.95;color:var(--muted);max-width:none}
.footer-contact__row .mono{font-size:13px;color:var(--text);letter-spacing:.02em}
.footer-service{margin-top:14px;font-size:12px;line-height:1.9;color:var(--muted);max-width:34em}
.footer-contact .btn{margin-top:16px}
.footer-bottom{border-top:1px solid var(--line);background:rgba(27,21,18,.42)}
.footer-meta{
  width:100%;max-width:1240px;margin-inline:auto;
  padding:18px 20px 24px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  font-size:12px;color:var(--muted);
}
.footer-meta__legal{font-family:var(--font-mono);letter-spacing:.02em}
.footer-meta__year{font-family:var(--font-mono);letter-spacing:.06em;color:var(--text)}

/* ---------- 16. 桌面端轨道版式 ---------- */
@media (min-width:640px){
  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (min-width:1080px){
  body{padding-left:var(--rail-w);padding-top:var(--strip-h)}
  .site-header{inset:0;height:auto}
  .rail{
    top:0;bottom:0;left:0;right:auto;width:var(--rail-w);height:auto;
    flex-direction:column;align-items:center;
    padding:16px 8px 20px;
    border-bottom:0;border-right:1px solid var(--line);
    background:
      radial-gradient(120% 26% at 50% 0%,rgba(76,224,179,.14),transparent 70%),
      linear-gradient(180deg,#0A1512,#06110F 56%,#081411);
    overflow-y:auto;overflow-x:hidden;scrollbar-width:none;
  }
  .rail::-webkit-scrollbar{width:0}
  .rail-head{
    flex-direction:column;align-items:center;justify-content:flex-start;
    gap:14px;width:100%;padding-bottom:14px;border-bottom:1px solid var(--line);
  }
  .brand{flex-direction:column;align-items:center;gap:6px}
  .brand__cn{font-size:15px;letter-spacing:.24em}
  .nav-toggle{display:none}
  .site-nav{
    position:static;top:auto;left:auto;bottom:auto;z-index:auto;
    width:100%;height:auto;flex:1 1 auto;min-height:0;
    padding:12px 0 0;overflow:visible;
    background:none;border:0;box-shadow:none;
    align-items:center;gap:8px;transform:none;transition:none;
  }
  .site-nav__label{
    writing-mode:vertical-rl;letter-spacing:.34em;font-size:10px;
    padding:4px 0;border-bottom:0;
  }
  .site-nav__list{width:100%;align-items:center;gap:2px}
  .nav-link{flex-direction:column;gap:6px;width:100%;padding:10px 2px;align-items:center}
  .nav-link::before{left:2px;top:10px;bottom:10px}
  .nav-link__text{writing-mode:vertical-rl;font-size:14px;letter-spacing:.14em}
  .nav-tools{width:100%;align-items:center;gap:8px;margin-top:auto;padding-top:12px}
  .nav-tools__title{font-size:10px;letter-spacing:.2em}
  .nav-tools .status-tags{width:100%;gap:4px}
  .nav-tools .status-tag{justify-content:flex-start;font-size:11px;padding:6px 8px}
  .utility-strip{
    pointer-events:auto;
    display:flex;position:absolute;top:0;left:var(--rail-w);right:0;height:var(--strip-h);
    align-items:center;gap:14px;padding:0 28px;
    background:linear-gradient(90deg,rgba(10,21,18,.98),rgba(7,26,22,.9));
    border-bottom:1px solid var(--line);
    backdrop-filter:blur(10px);
  }
  .utility-strip__tagline{font:500 12px/1 var(--font-sans);letter-spacing:.26em;color:var(--muted)}
  .utility-strip__tags{margin-left:auto}
  .utility-strip__cta{margin-left:6px}
  .nav-scrim{display:none}
  .footer-inner{grid-template-columns:1.5fr 1fr 1fr 1.4fr;padding:64px 40px 40px;gap:48px 40px}
  .footer-brand{grid-column:auto}
  .footer-meta{padding:20px 40px 28px}
}
@media (min-width:1080px) and (max-height:880px){
  .nav-link{padding:7px 2px}
  .nav-link__text{font-size:13px;letter-spacing:.06em}
  .site-nav__label{display:none}
  .nav-tools{padding-top:10px}
}

/* ---------- 17. 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;
  }
  [data-reveal]{opacity:1;transform:none}
  .card:hover{transform:none}
  .site-nav{transform:none}
  .site-nav{display:none}
  .site-header[data-open="true"] .site-nav{display:flex;transform:none}
}