/* =========================================================
   云开赛场 / site.css — 共享外壳、令牌与通用组件
   ========================================================= */

/* 1. 重置与令牌 ------------------------------------------------ */
*,*::before,*::after{box-sizing:border-box}

:root{
  --ink:#081226;
  --ink-2:#12244A;
  --ink-3:#0B1730;
  --panel:#0E1E3C;
  --teal:#17D1C6;
  --blue:#3AA0FF;
  --violet:#7A5CFF;
  --orange:#FF7A2F;
  --lime:#B8FF3D;
  --line:#29406A;
  --line-soft:rgba(41,64,106,.55);
  --paper:#F2F6FC;
  --text:#DCE5F2;
  --muted:#8C9CB5;
  --black:#03080F;
  --title:#F2F6FC;

  --rail-w:84px;
  --bar-h:58px;
  --shell:1240px;
  --pad:clamp(16px,4vw,32px);
  --cut:18px;

  --font-display:"Oswald","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",Consolas,"SFMono-Regular","Courier New",monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
}

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

body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  background:var(--ink);
  color:var(--text);
  overflow-x:hidden;
}

/* 蓝图底层纹理：主网格 120px + 索引网格 24px */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(41,64,106,.5) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(41,64,106,.5) 1px,transparent 1px),
    linear-gradient(to right,rgba(41,64,106,.2) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(41,64,106,.2) 1px,transparent 1px);
  background-size:120px 120px,120px 120px,24px 24px,24px 24px;
}

main{position:relative;z-index:1;display:block}

img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5,h6,p{margin:0}
h1,h2,h3,h4{font-weight:600;line-height:1.2}
table{border-collapse:collapse;width:100%}
[id]{scroll-margin-top:96px}

:focus-visible{outline:2px solid var(--lime);outline-offset:3px;border-radius:2px}
::selection{background:var(--teal);color:var(--ink)}

body.is-locked{overflow:hidden}

/* 2. 排版 ------------------------------------------------------ */
.h-display{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(38px,6.4vw,76px);
  line-height:1.02;
  letter-spacing:.02em;
  text-transform:uppercase;
  color:var(--title);
}
.section-title{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(24px,3vw,38px);
  line-height:1.16;
  letter-spacing:.02em;
  color:var(--title);
}
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--teal);
}
.lede{
  font-size:clamp(16px,1.5vw,19px);
  line-height:1.8;
  color:var(--muted);
  max-width:64ch;
}
.num-ghost{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(52px,8vw,120px);
  line-height:.82;
  letter-spacing:.02em;
  color:transparent;
  -webkit-text-stroke:1px var(--line);
}
.mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.12em}
.text-accent{color:var(--teal)}
.text-muted{color:var(--muted)}
.prose{max-width:74ch;font-size:16.5px;line-height:1.85}
.prose p{margin-bottom:1.1em}
.prose h3{margin:1.8em 0 .6em;font-size:20px;color:var(--title)}
.prose ul{margin:0 0 1.2em 1.1em;list-style:square}
.prose li{margin-bottom:.5em}
.prose strong{color:var(--title)}

/* 3. 工具类 ---------------------------------------------------- */
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;border:0;
  clip:rect(0 0 0 0);clip-path:inset(50%);
  overflow:hidden;white-space:nowrap;
}
.u-stack{display:flex;flex-direction:column;gap:14px}

/* 4. 布局 ------------------------------------------------------ */
.container{width:min(var(--shell),calc(100% - 2 * var(--pad)));margin-inline:auto}

.section{position:relative;z-index:1;padding:clamp(56px,8vw,110px) 0}
.section > .container{position:relative;z-index:1}

.section--paper{
  background:var(--paper);
  color:#0A1A33;
  --text:#0A1A33;
  --muted:#4C6285;
  --line:#C6D3E6;
  --line-soft:rgba(8,18,38,.14);
  --title:#081226;
  --panel:#FFFFFF;
}
.section--paper::before{
  content:"";
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(8,18,38,.07) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(8,18,38,.07) 1px,transparent 1px);
  background-size:32px 32px;
}
.section--paper .num-ghost{-webkit-text-stroke:1px #B9C9DE;color:transparent}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-start;
  gap:clamp(14px,3vw,34px);
  margin-bottom:clamp(26px,4vw,48px);
}
.section-head > .u-stack{flex:1 1 320px;min-width:0}

.grid{display:grid;gap:clamp(18px,2.4vw,30px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.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-12{grid-column:span 12}

/* 5. 按钮与操作 ------------------------------------------------ */
.btn{
  position:relative;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--text);
  background:rgba(18,36,74,.72);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
  transition:background .24s var(--ease),border-color .24s var(--ease),color .24s var(--ease),transform .24s var(--ease);
}
.btn:hover{background:rgba(23,209,198,.14);border-color:var(--teal);color:#FFFFFF;transform:translateY(-1px)}
.btn--accent{background:var(--orange);border-color:transparent;color:#180A02;font-weight:700}
.btn--accent:hover{background:#FF9250;border-color:transparent;color:#180A02}
.btn--ghost{background:transparent}
.btn--sm{padding:8px 12px;font-size:11px;letter-spacing:.12em}
.btn--rail{writing-mode:vertical-rl;padding:16px 9px;letter-spacing:.22em}

.copybtn{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  padding:3px 8px;
  border:1px solid var(--line);
  color:var(--teal);
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.copybtn:hover{border-color:var(--teal);background:rgba(23,209,198,.14)}
.copybtn[data-copied="true"]{background:var(--lime);border-color:var(--lime);color:var(--ink)}

/* 6. 头部：移动条 + 桌面轨道 ------------------------------------ */
.site-header{position:relative;z-index:60}

.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  padding:10px 16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--ink);
  background:var(--lime);
  transform:translateY(-220%);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* 移动顶条 */
.mobilebar{
  position:fixed;
  top:0;left:0;right:0;
  z-index:80;
  height:var(--bar-h);
  display:flex;
  align-items:center;
  gap:10px;
  padding:0 14px;
  background:rgba(8,18,38,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
}
.mobilebar__brand{display:inline-flex;align-items:center;gap:8px;min-width:0}
.mobilebar__name{
  font-family:var(--font-display);
  font-weight:600;
  font-size:15px;
  letter-spacing:.08em;
  color:var(--paper);
  white-space:nowrap;
}
.mobilebar__code{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--muted);
  border:1px solid var(--line);
  padding:2px 6px;
  white-space:nowrap;
}
.mobilebar__cta{margin-left:auto}

.brandmark{
  display:grid;
  place-items:center;
  flex:none;
  width:26px;height:26px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  color:var(--ink);
  background:linear-gradient(135deg,var(--teal),var(--blue));
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
}
.brandmark--lg{width:38px;height:38px;font-size:17px}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--text);
  border:1px solid var(--line);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--teal);color:var(--paper)}
.nav-toggle__bars{display:grid;gap:3px}
.nav-toggle__bars i{display:block;width:16px;height:1.5px;background:var(--teal);transition:transform .26s var(--ease),opacity .26s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(4.5px) 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(-4.5px) rotate(-45deg)}

/* 桌面轨道 */
.rail{
  position:fixed;
  left:0;top:0;bottom:0;
  z-index:70;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  padding:16px 0 18px;
  background:linear-gradient(180deg,#0A1730 0%,#12244A 58%,#0B1730 100%);
  border-right:1px solid var(--line);
  overflow:hidden;
}
.rail::after{
  content:"";
  position:absolute;
  top:0;bottom:0;right:0;
  width:6px;
  pointer-events:none;
  background-image:repeating-linear-gradient(to bottom,rgba(140,156,181,.55) 0 1px,transparent 1px 14px);
  opacity:.65;
}
.rail__brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:9px;
  width:100%;
  padding:4px 0 14px;
  border-bottom:1px solid var(--line-soft);
}
.rail__mark{
  display:grid;
  place-items:center;
  width:32px;height:32px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  color:var(--ink);
  background:linear-gradient(135deg,var(--teal),var(--blue));
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.rail__name{
  writing-mode:vertical-rl;
  font-family:var(--font-display);
  font-weight:600;
  font-size:14px;
  letter-spacing:.14em;
  color:var(--paper);
}
.rail__sub{
  font-family:var(--font-mono);
  font-size:9px;
  letter-spacing:.18em;
  color:var(--muted);
}
.rail__progress{
  position:absolute;
  left:0;top:0;
  width:2px;height:0;
  background:linear-gradient(180deg,var(--teal),var(--lime));
  box-shadow:0 0 12px rgba(23,209,198,.6);
}

/* 侧边轨道导航（桌面竖排 / 移动抽屉） */
.sitenav{
  display:flex;
  flex:1 1 auto;
  flex-direction:column;
  align-items:center;
  gap:10px;
  width:100%;
  min-height:0;
  overflow-y:auto;
  overflow-x:hidden;
  scrollbar-width:none;
}
.sitenav::-webkit-scrollbar{display:none}
.sitenav__head{display:none}
.sitenav__list{display:flex;flex-direction:column;align-items:center;gap:2px;width:100%}
.sitenav__item{width:100%}
.sitenav__link{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:5px;
  width:100%;
  padding:8px 4px;
  color:var(--muted);
  border-left:2px solid transparent;
  transition:color .22s var(--ease),background .22s var(--ease),border-color .22s var(--ease);
}
.sitenav__link:hover{color:var(--paper);background:rgba(23,209,198,.1)}
.sitenav__link[aria-current="page"]{
  color:#FFFFFF;
  border-left-color:var(--orange);
  background:linear-gradient(90deg,rgba(255,122,47,.26),rgba(255,122,47,0));
}
.sitenav__link[aria-current="page"] .sitenav__index{color:var(--orange)}
.sitenav__index{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--muted);
  transition:color .22s var(--ease);
}
.sitenav__label{
  writing-mode:vertical-rl;
  font-size:12.5px;
  letter-spacing:.08em;
  line-height:1.1;
}
.sitenav__foot{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:10px;
  width:100%;
  padding-top:10px;
  border-top:1px solid var(--line-soft);
}
.sitenav__note{display:none}

.nav-scrim{
  display:none;
  position:fixed;
  inset:0;
  z-index:85;
  background:rgba(3,8,15,.74);
  opacity:0;
  visibility:hidden;
  transition:opacity .3s var(--ease),visibility .3s var(--ease);
}

/* 7. 页脚 ------------------------------------------------------ */
.site-footer{
  position:relative;
  z-index:1;
  padding:clamp(48px,6vw,78px) 0 26px;
  background:var(--black);
  border-top:1px solid var(--line);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(41,64,106,.6) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(41,64,106,.6) 1px,transparent 1px);
  background-size:64px 64px;
  opacity:.35;
}
.footer__accent{
  position:absolute;
  top:0;left:0;right:0;
  height:6px;
  background:linear-gradient(90deg,var(--teal) 0 22%,var(--blue) 22% 46%,var(--violet) 46% 68%,var(--orange) 68% 86%,var(--lime) 86% 100%);
  clip-path:polygon(0 0,100% 0,100% 55%,0 100%);
}
.footer__inner{position:relative;z-index:2}

.footer__top{
  display:grid;
  grid-template-columns:1.5fr .85fr .85fr .85fr;
  gap:clamp(24px,3vw,48px);
  padding-bottom:34px;
  border-bottom:1px solid var(--line-soft);
}
.footer__brand{display:flex;flex-direction:column;gap:14px;max-width:42ch}
.footer__logo{display:inline-flex;align-items:center;gap:10px}
.footer__logotext{
  font-family:var(--font-display);
  font-weight:600;
  font-size:20px;
  letter-spacing:.06em;
  color:var(--paper);
}
.footer__note{font-size:14px;line-height:1.7;color:var(--muted)}
.footer__coord{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:rgba(140,156,181,.72);
}
.footer__contactlist{display:flex;flex-direction:column;gap:10px}
.footer__contactitem{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12.5px;
}
.footer__ctag{
  padding:2px 6px;
  font-size:10px;
  letter-spacing:.16em;
  color:var(--teal);
  border:1px solid rgba(23,209,198,.4);
}
.footer__cvalue{color:var(--text);word-break:break-all}

.footer__coltitle{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--teal);
}
.footer__colindex{color:rgba(140,156,181,.62);font-size:10px}
.footer__links{display:flex;flex-direction:column;gap:9px}
.footer__links a{
  font-size:14.5px;
  color:var(--text);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer__links a:hover{color:var(--teal);border-bottom-color:var(--teal)}

.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:14px 26px;
  padding-top:22px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--muted);
}
.footer__facts{display:flex;flex-direction:column;gap:6px;max-width:60ch}
.footer__addr{color:var(--muted)}
.footer__meta{color:rgba(140,156,181,.85)}
.footer__legal{display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px}
.footer__legal a{color:var(--text);transition:color .2s var(--ease)}
.footer__legal a:hover{color:var(--lime)}
.footer__icp,.footer__year{color:var(--muted)}

/* 8. 通用内容组件 ---------------------------------------------- */
.panel{
  position:relative;
  padding:clamp(18px,2.2vw,26px);
  background:linear-gradient(160deg,rgba(18,36,74,.94),rgba(11,23,48,.94));
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
  transition:border-color .26s var(--ease),transform .26s var(--ease);
}
.panel:hover{border-color:rgba(23,209,198,.6);transform:translateY(-3px)}
.section--paper .panel{background:#FFFFFF;border-color:#C6D3E6;box-shadow:0 12px 26px rgba(8,18,38,.08)}
.panel__index{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--teal);
}
.panel__title{
  margin-bottom:8px;
  font-family:var(--font-display);
  font-size:20px;
  letter-spacing:.03em;
  color:var(--title);
}
.panel__text{font-size:15px;line-height:1.75;color:var(--muted)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
  background:rgba(8,18,38,.55);
  border:1px solid var(--line);
}
.tag--live{color:var(--lime);border-color:rgba(184,255,61,.45)}
.tag--hot{color:var(--orange);border-color:rgba(255,122,47,.5)}
.tag--violet{color:#B9A9FF;border-color:rgba(122,92,255,.55)}
.section--paper .tag{background:#FFFFFF;border-color:#C6D3E6;color:#4C6285}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(22px,3vw,34px);
  line-height:1.1;
  color:var(--lime);
  letter-spacing:.02em;
}
.stat__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--muted);
}
.stat-row{display:flex;flex-wrap:wrap;gap:clamp(20px,4vw,54px)}

.track{
  display:flex;
  gap:16px;
  padding:6px 4px 20px;
  overflow-x:auto;
  overscroll-behavior-x:contain;
  scroll-snap-type:x proximity;
  scrollbar-width:thin;
  scrollbar-color:var(--line) transparent;
}
.track::-webkit-scrollbar{height:6px}
.track::-webkit-scrollbar-track{background:rgba(41,64,106,.25)}
.track::-webkit-scrollbar-thumb{background:var(--line)}
.track__item{flex:0 0 auto;scroll-snap-align:start}

.media{
  position:relative;
  overflow:hidden;
  background:linear-gradient(135deg,#0C1B36,#12244A);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,20px 100%,0 calc(100% - 20px));
}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(1.05) contrast(1.05)}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--scan::after{
  content:"";
  position:absolute;inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(180deg,rgba(23,209,198,.08) 0 1px,transparent 1px 5px);
}
.media__cap{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:10px 12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--text);
  background:linear-gradient(0deg,rgba(3,8,15,.88),transparent);
}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:20px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--muted);
}
.breadcrumb a{color:var(--muted);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--teal)}
.breadcrumb__sep{color:var(--line)}
.breadcrumb [aria-current="page"]{color:var(--teal)}

.accordion{border-top:1px solid var(--line)}
.accordion__item{border-bottom:1px solid var(--line)}
.accordion__head{
  display:flex;
  align-items:center;
  gap:12px;
  padding:16px 4px;
  font-family:var(--font-body);
  font-size:17px;
  color:var(--title);
  cursor:pointer;
  list-style:none;
}
.accordion__head::-webkit-details-marker{display:none}
.accordion__head::before{
  content:"+";
  font-family:var(--font-mono);
  font-size:14px;
  color:var(--teal);
}
.accordion__item[open] > .accordion__head::before{content:"−";color:var(--orange)}
.accordion__body{padding:0 0 20px 26px;font-size:16px;line-height:1.8;color:var(--muted)}

/* 9. 滚动显现 -------------------------------------------------- */
[data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .48s var(--ease),transform .48s var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* 10. 断点：桌面轨道布局 --------------------------------------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .mobilebar{display:none}
  .nav-scrim{display:none}
}

/* 11. 断点：平板与手机（抽屉导航） ------------------------------ */
@media (max-width:1023px){
  body{padding-top:var(--bar-h)}

  .rail{
    position:static;
    display:block;
    width:auto;
    padding:0;
    background:none;
    border:0;
    overflow:visible;
  }
  .rail::after{display:none}
  .rail__brand{display:none}
  .rail__progress{display:none}

  .sitenav{
    position:fixed;
    top:0;left:0;bottom:0;
    z-index:90;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    width:min(320px,86vw);
    height:100%;
    padding:18px 18px 24px;
    gap:0;
    background:linear-gradient(160deg,#0B1730,#12244A);
    border-right:1px solid var(--line);
    transform:translateX(-104%);
    transition:transform .36s var(--ease);
    overflow-y:auto;
  }
  .sitenav[data-open]{transform:translateX(0)}
  .sitenav__head{
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding-bottom:14px;
    border-bottom:1px solid var(--line-soft);
  }
  .sitenav__headlabel{
    font-family:var(--font-mono);
    font-size:11px;
    letter-spacing:.24em;
    text-transform:uppercase;
    color:var(--teal);
  }
  .sitenav__close{
    display:grid;
    place-items:center;
    width:34px;height:34px;
    font-size:18px;
    line-height:1;
    color:var(--text);
    border:1px solid var(--line);
  }
  .sitenav__close:hover{border-color:var(--orange);color:var(--orange)}

  .sitenav__list{flex-direction:column;align-items:stretch;gap:4px;margin-top:14px}
  .sitenav__link{
    flex-direction:row;
    align-items:center;
    justify-content:flex-start;
    gap:14px;
    padding:12px 12px;
    border-left:2px solid transparent;
  }
  .sitenav__index{font-size:12px;letter-spacing:.18em}
  .sitenav__label{writing-mode:horizontal-tb;font-size:16px;letter-spacing:.06em}

  .sitenav__foot{
    align-items:stretch;
    margin-top:auto;
    padding-top:18px;
  }
  .btn--rail{writing-mode:horizontal-tb;width:100%;padding:14px}
  .sitenav__note{
    display:block;
    font-family:var(--font-mono);
    font-size:11.5px;
    line-height:1.7;
    letter-spacing:.02em;
    color:var(--muted);
  }

  .nav-scrim{display:block}
  .nav-scrim[data-open]{opacity:1;visibility:visible}

  .grid--12 > [class*="col-"]{grid-column:span 12}
  .footer__top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__brand{grid-column:span 2;max-width:none}
  .footer__bottom{flex-direction:column}
}

@media (max-width:720px){
  body{font-size:16px}
  .footer__top{grid-template-columns:1fr}
  .footer__brand{grid-column:span 1}
  .rail__name{font-size:13px}
}

@media (max-width:480px){
  .mobilebar__code{display:none}
  .mobilebar__name{font-size:14px}
  .num-ghost{font-size:56px}
}

/* 12. 无障碍与动效降级 ----------------------------------------- */
@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}
  .btn:hover,.panel:hover{transform:none}
}