/* =============================================================
   U体育赛场 — 共享样式表 /assets/site.css
   夜场记分牌 · 数据流图层 · 档案卡片
   ============================================================= */

/* ---------- 01 变量 ---------- */
:root{
  --ink-950:#070D1C;
  --ink-900:#0C1530;
  --ink-800:#122043;
  --ink-700:#1B2A55;

  --pulse:#39FF88;
  --electric:#2E8BFF;
  --mist:#8FD9FF;
  --warm:#F4F1EA;
  --steel:#93A0BF;
  --paper:#EDE7DA;
  --amber:#FFB347;

  --font-display:"Barlow Condensed","Oswald","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-serif:"Noto Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-body:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;

  --shell:1200px;
  --header-h:72px;
  --radius:3px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:200ms;
  --line:1px solid var(--ink-700);
  --glow-pulse:0 0 0 1px rgba(57,255,136,.4),0 14px 34px -20px rgba(57,255,136,.6);
  --glow-blue:0 18px 38px -26px rgba(46,139,255,.85);
}

/* ---------- 02 Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  background:var(--ink-950);
}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%}
:focus-visible{outline:2px solid var(--pulse);outline-offset:3px;border-radius:2px}

/* ---------- 03 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  color:var(--warm);
  background-color:var(--ink-950);
  background-image:
    radial-gradient(900px 460px at 82% -8%, rgba(46,139,255,.16), rgba(7,13,28,0) 70%),
    radial-gradient(620px 340px at 4% 4%, rgba(57,255,136,.08), rgba(7,13,28,0) 72%),
    repeating-linear-gradient(90deg, rgba(147,160,191,.055) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(147,160,191,.04) 0 1px, transparent 1px 88px);
  background-attachment:fixed;
  min-height:100vh;
  overflow-x:hidden;
  text-rendering:optimizeLegibility;
}

h1,h2,h3{font-family:var(--font-display);font-weight:700;line-height:1.16;letter-spacing:.005em}
h1{font-size:clamp(34px,6vw,68px);text-transform:none}
p{max-width:74ch}
strong{color:var(--warm);font-weight:700}
em{font-style:normal;color:var(--mist)}

.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.divider{height:1px;background:linear-gradient(90deg,var(--ink-700),rgba(27,42,85,0) 92%);border:0;margin:26px 0}
.rule{height:1px;background:var(--ink-700);border:0;margin:18px 0}

/* ---------- 04 跳转与页面外壳 ---------- */
.skip-link{
  position:absolute;top:-64px;left:14px;z-index:200;
  padding:10px 16px;border-radius:var(--radius);
  background:var(--pulse);color:#04140A;
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.06em;
  transition:top 160ms var(--ease);
}
.skip-link:focus{top:12px}

.shell{
  width:min(100% - 2 * clamp(14px,3vw,24px), var(--shell));
  margin-inline:auto;
}

#main-content{display:block;padding-top:calc(var(--header-h) + 24px)}
#main-content.bleed-hero{padding-top:0}

/* ---------- 05 头部 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  background:linear-gradient(180deg, rgba(7,13,28,.86) 0%, rgba(7,13,28,.28) 62%, rgba(7,13,28,0) 100%);
  border-bottom:1px solid transparent;
  transition:background-color 220ms var(--ease),border-color 220ms var(--ease),box-shadow 220ms var(--ease);
}
.site-header.is-scrolled{
  background:rgba(7,13,28,.96);
  border-bottom-color:var(--ink-700);
  box-shadow:0 18px 40px -34px rgba(0,0,0,.95);
  backdrop-filter:saturate(140%) blur(8px);
}
.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(27,42,85,.65);overflow:hidden}
.scroll-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--electric),var(--pulse));transition:width 120ms linear}

.header-inner{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  min-height:var(--header-h);
}

.brand{display:inline-flex;align-items:center;gap:12px;padding:6px 0;border-radius:var(--radius)}
.brand__mark{
  display:grid;place-items:center;flex:none;
  width:38px;height:38px;border-radius:var(--radius);
  background:linear-gradient(150deg,var(--electric),rgba(57,255,136,.85));
  color:#04140A;font-family:var(--font-display);font-size:23px;font-weight:700;line-height:1;
  border:1px solid rgba(143,217,255,.55);
}
.brand__text{display:flex;flex-direction:column;gap:1px}
.brand__name{
  font-family:var(--font-display);font-size:21px;font-weight:700;letter-spacing:.04em;line-height:1.1;
  color:var(--warm);
}
.brand__tagline{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--steel);line-height:1.2;
}
.brand:hover .brand__name{color:var(--pulse)}

.primary-nav{display:flex;align-items:center;gap:10px}
.nav-drawer-head{display:none}

.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:block}

.nav-link{
  position:relative;display:inline-flex;align-items:center;gap:8px;
  padding:9px 12px;border-radius:var(--radius);
  font-size:14.5px;color:var(--steel);
  transition:color 160ms var(--ease),background-color 160ms var(--ease);
}
.nav-link__tick{
  width:6px;height:6px;flex:none;border-radius:50%;
  border:1px solid var(--ink-700);background:transparent;
  transition:background-color 160ms var(--ease),border-color 160ms var(--ease),box-shadow 160ms var(--ease);
}
.nav-link:hover{color:var(--warm);background:rgba(27,42,85,.55)}
.nav-link[aria-current="page"]{color:var(--warm);font-weight:700}
.nav-link[aria-current="page"] .nav-link__tick{
  background:var(--pulse);border-color:var(--pulse);box-shadow:0 0 10px rgba(57,255,136,.85);
}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;border-radius:2px;
  background:var(--pulse);
}

.header-cta{white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;border:var(--line);border-radius:999px;
  color:var(--warm);font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  transition:border-color 160ms var(--ease),color 160ms var(--ease);
}
.nav-toggle:hover{border-color:var(--pulse);color:var(--pulse)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:2px;background:currentColor;border-radius:2px;transition:transform 200ms var(--ease),opacity 160ms var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(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(-5px) rotate(-45deg)}

.nav-scrim{
  position:fixed;inset:0;z-index:60;
  background:rgba(4,8,18,.72);
  opacity:0;pointer-events:none;
  transition:opacity 220ms var(--ease);
}
body.nav-open .nav-scrim{opacity:1;pointer-events:auto}
body.nav-open{overflow:hidden}

/* ---------- 06 移动端底部赛程条 ---------- */
.dock-bar{
  display:none;
  position:fixed;left:12px;right:12px;bottom:12px;z-index:70;
  align-items:center;gap:6px;
  padding:8px 10px;
  background:rgba(12,21,48,.94);
  border:1px solid var(--ink-700);border-radius:999px;
  box-shadow:0 22px 44px -28px rgba(0,0,0,.95);
  backdrop-filter:blur(8px);
}
.dock-bar__live{display:inline-flex;align-items:center;gap:7px;padding:0 8px 0 4px;border-right:1px solid var(--ink-700);margin-right:2px}
.dock-bar__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--steel)}
.live-dot{width:7px;height:7px;border-radius:50%;background:var(--pulse);box-shadow:0 0 10px rgba(57,255,136,.9)}
.dock-link{
  flex:1 1 0;text-align:center;
  padding:7px 4px;border-radius:999px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--steel);
  transition:color 160ms var(--ease),background-color 160ms var(--ease);
}
.dock-link:hover,.dock-link:focus-visible{color:var(--ink-950);background:var(--pulse)}

/* ---------- 07 页脚 ---------- */
.site-footer{
  position:relative;margin-top:72px;
  background:linear-gradient(180deg,var(--ink-900),var(--ink-950) 78%);
  border-top:1px solid var(--ink-700);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:1px;
  background:repeating-linear-gradient(90deg,var(--pulse) 0 14px,rgba(27,42,85,.9) 14px 42px);
  opacity:.5;
}
.footer-inner{padding:44px 0 30px}

.footer-signature{display:flex;flex-wrap:wrap;align-items:baseline;gap:14px;padding-bottom:20px;border-bottom:1px solid var(--ink-700)}
.footer-brand{
  font-family:var(--font-display);font-size:30px;font-weight:700;letter-spacing:.03em;color:var(--warm);line-height:1;
}
.footer-claim{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--steel)}

.footer-grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:30px 32px;padding:28px 0 26px;
}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--font-mono);font-size:11.5px;font-weight:400;
  letter-spacing:.16em;color:var(--mist);
  padding-bottom:9px;margin-bottom:12px;
  border-bottom:1px solid var(--ink-700);
}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-links--plain{gap:11px}
.footer-link{
  display:inline-block;font-size:14.5px;color:var(--steel);
  border-bottom:1px solid transparent;
  transition:color 160ms var(--ease),border-color 160ms var(--ease);
}
.footer-link:hover{color:var(--pulse);border-bottom-color:rgba(57,255,136,.6)}
.footer-links--plain li{display:flex;flex-wrap:wrap;gap:4px 10px;align-items:baseline}
.footer-key{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--steel);min-width:58px}
.footer-val{font-size:14px;color:var(--warm);word-break:break-word}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  padding-top:18px;border-top:1px solid var(--ink-700);
}
.footer-legal__line{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--steel);
}
.footer-legal__meta{font-family:var(--font-mono);font-size:12px;color:var(--steel)}

.to-top{
  position:fixed;right:20px;bottom:22px;z-index:65;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border:1px solid rgba(57,255,136,.55);border-radius:999px;
  background:rgba(7,13,28,.94);color:var(--pulse);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  opacity:0;transform:translateY(10px);pointer-events:none;
  transition:opacity 200ms var(--ease),transform 200ms var(--ease),background-color 160ms var(--ease);
}
.to-top.is-visible{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:var(--pulse);color:#04140A}

/* ---------- 08 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;border:1px solid var(--ink-700);border-radius:999px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--warm);
  transition:transform 160ms var(--ease),border-color 160ms var(--ease),
             background-color 160ms var(--ease),color 160ms var(--ease),box-shadow 200ms var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--pulse{background:var(--pulse);border-color:var(--pulse);color:#04140A;font-weight:700}
.btn--pulse:hover{box-shadow:var(--glow-pulse)}
.btn--ghost{background:rgba(12,21,48,.6)}
.btn--ghost:hover{border-color:var(--electric);color:var(--mist);box-shadow:var(--glow-blue)}
.btn--tiny{padding:6px 12px;font-size:11.5px}

/* ---------- 09 面包屑 ---------- */
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:18px}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--steel)}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";color:var(--ink-700)}
.breadcrumbs__link{color:var(--steel);transition:color 160ms var(--ease)}
.breadcrumbs__link:hover{color:var(--pulse)}
.breadcrumbs__item[aria-current="page"] .breadcrumbs__link{color:var(--warm)}

/* ---------- 10 网格与章节 ---------- */
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:20px}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}

.section{margin:0 0 56px}
.section__head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:10px 20px;padding-bottom:12px;margin-bottom:22px;border-bottom:1px solid var(--ink-700)}
.section__title{font-family:var(--font-display);font-size:clamp(22px,3.2vw,32px);letter-spacing:.01em}
.section__note{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--steel)}

.chapter{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;align-items:baseline;margin-bottom:20px}
.chapter__num{
  grid-row:span 2;
  font-family:var(--font-mono);font-size:clamp(28px,4.4vw,46px);font-weight:700;line-height:.9;
  color:var(--electric);opacity:.18;
  transition:opacity 260ms var(--ease),color 260ms var(--ease);
}
.chapter__title{font-family:var(--font-serif);font-size:clamp(19px,2.4vw,25px);font-weight:700;line-height:1.3}
.chapter__sub{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;color:var(--steel)}
.chapter.is-visible .chapter__num,.chapter__num.is-visible{opacity:1;color:var(--pulse)}

.lede{font-size:clamp(17px,2.1vw,20px);line-height:1.7;color:#DFDBD1;max-width:62ch}

/* ---------- 11 数据与元信息 ---------- */
.stat{display:flex;flex-direction:column;gap:2px;padding:12px 0 12px 12px;border-left:2px solid var(--ink-700)}
.stat__value{font-family:var(--font-mono);font-size:24px;font-weight:700;color:var(--warm);letter-spacing:-.01em;line-height:1.1}
.stat__label{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;color:var(--steel)}
.stat--live{border-left-color:var(--pulse)}
.stat--live .stat__value{color:var(--pulse)}

.stamp{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--steel)}

.meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px}
.meta__item{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--steel)}
.meta__item + .meta__item::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--ink-700);margin-right:2px}

/* ---------- 12 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border:1px solid var(--ink-700);border-radius:999px;
  background:rgba(12,21,48,.75);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--steel);
}
.tag--live{color:var(--pulse);border-color:rgba(57,255,136,.55);background:rgba(57,255,136,.08)}
.tag--info{color:var(--mist);border-color:rgba(46,139,255,.6);background:rgba(46,139,255,.1)}
.tag--amber{color:var(--amber);border-color:rgba(255,179,71,.55);background:rgba(255,179,71,.08)}
.tag--paper{background:var(--paper);color:var(--ink-950);border-color:#CFC7B6;font-weight:700}

/* ---------- 13 卡片 ---------- */
.card{
  position:relative;
  background:var(--ink-900);
  border:var(--line);border-radius:var(--radius);
  padding:18px 20px;
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.card:hover,.card:focus-within{transform:translateY(-2px);border-color:var(--electric);box-shadow:var(--glow-blue)}
.card__head{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin-bottom:10px}
.card__body{font-size:15.5px;color:#D9D5CB}
.card__foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;margin-top:14px;padding-top:12px;border-top:1px solid var(--ink-700)}
.card--paper{
  background:var(--paper);color:var(--ink-950);border-color:#CFC7B6;
}
.card--paper .card__body,.card--paper p{color:#1A1F2E}
.card--paper .card__foot{border-top-color:rgba(7,13,28,.18)}
.card--flush{padding:0;overflow:hidden}
.card--live{border-color:rgba(57,255,136,.5)}
.card--live::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--pulse);border-radius:var(--radius) 0 0 var(--radius);
}

/* ---------- 14 时间轴 ---------- */
.timeline{position:relative;margin:24px 0 8px}
.timeline__rail{
  display:grid;grid-auto-flow:column;grid-auto-columns:minmax(150px,1fr);
  border-top:2px solid var(--ink-700);
  overflow-x:auto;overscroll-behavior-x:contain;
  padding-bottom:6px;
}
.timeline__item{position:relative;padding:18px 16px 4px 0}
.timeline__item::before{
  content:"";position:absolute;top:-2px;left:0;width:2px;height:10px;background:var(--ink-700);
  transition:height 200ms var(--ease),background-color 200ms var(--ease),box-shadow 200ms var(--ease);
}
.timeline__item:hover::before{height:16px;background:var(--electric)}
.timeline__item.is-live::before{height:18px;background:var(--pulse);box-shadow:0 0 14px rgba(57,255,136,.9)}
.timeline__time{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--steel)}
.timeline__item.is-live .timeline__time{color:var(--pulse)}

/* ---------- 15 图片容器 ---------- */
.media{display:block;margin:0}
.media__frame{
  position:relative;overflow:hidden;
  border:var(--line);border-radius:var(--radius);
  aspect-ratio:16/9;
  background:
    linear-gradient(140deg, rgba(46,139,255,.24), rgba(7,13,28,.92) 62%),
    radial-gradient(280px 160px at 78% 12%, rgba(57,255,136,.16), rgba(7,13,28,0) 70%),
    var(--ink-900);
}
.media__img{width:100%;height:100%;object-fit:cover;display:block}
.media__caption{margin-top:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--steel)}
.media__badge{position:absolute;left:10px;top:10px;z-index:2}
.media--portrait .media__frame{aspect-ratio:3/4}
.media--square .media__frame{aspect-ratio:1/1}
.media--wide .media__frame{aspect-ratio:21/9}
.media--skew .media__frame{clip-path:polygon(0 0,100% 0,100% 84%,0 100%)}

/* ---------- 16 正文 ---------- */
.prose{max-width:70ch;font-size:16.5px;line-height:1.78;color:#D9D5CB}
.prose > * + *{margin-top:14px}
.prose p + p{border-top:1px solid rgba(27,42,85,.9);padding-top:14px}
.prose h2{font-family:var(--font-serif);font-size:22px;font-weight:700;color:var(--warm);margin-top:28px}
.prose h3{
  font-family:var(--font-mono);font-size:12.5px;font-weight:400;
  letter-spacing:.14em;color:var(--mist);margin-top:22px;
}
.prose a{color:var(--mist);border-bottom:1px solid rgba(46,139,255,.5);transition:color 160ms var(--ease),border-color 160ms var(--ease)}
.prose a:hover{color:var(--pulse);border-bottom-color:var(--pulse)}
.prose ul{display:flex;flex-direction:column;gap:8px;padding-left:2px}
.prose ul li{padding-left:18px;position:relative}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:7px;height:2px;background:var(--electric)}
.prose blockquote{
  border-left:2px solid var(--pulse);padding:4px 0 4px 16px;color:var(--steel);font-family:var(--font-serif);
}

/* ---------- 17 显现动效 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(10px);transition:opacity 260ms var(--ease),transform 260ms var(--ease)}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 18 响应式 ---------- */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .span-7,.span-8{grid-column:span 12}
  .span-5{grid-column:span 6}
}

@media (max-width:920px){
  :root{--header-h:64px}
  .nav-toggle{display:inline-flex}
  .brand__tagline{display:none}

  .primary-nav{
    position:fixed;top:0;right:0;bottom:0;z-index:75;
    width:min(86vw,380px);
    display:flex;flex-direction:column;align-items:stretch;gap:16px;
    padding:calc(var(--header-h) + 22px) 22px 34px;
    background:linear-gradient(180deg,var(--ink-900),var(--ink-950));
    border-left:var(--line);
    box-shadow:-30px 0 60px -40px rgba(0,0,0,.95);
    transform:translateX(104%);
    transition:transform 240ms var(--ease);
    overflow-y:auto;
  }
  .primary-nav[data-open="true"]{transform:translateX(0)}
  .nav-drawer-head{
    display:block;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;color:var(--mist);
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{border-bottom:1px solid rgba(27,42,85,.85)}
  .nav-link{
    width:100%;padding:15px 2px;
    font-family:var(--font-display);font-size:19px;letter-spacing:.03em;
  }
  .nav-link[aria-current="page"]::after{left:2px;right:auto;width:26px;bottom:8px}
  .header-cta{width:100%;padding:13px 18px}

  .dock-bar{display:flex}
  .site-footer{padding-bottom:74px}
  .to-top{bottom:82px;right:14px;padding:9px 13px}
  .footer-inner{padding:36px 0 26px}
}

@media (max-width:680px){
  body{font-size:16px}
  .grid{grid-template-columns:repeat(6,minmax(0,1fr));gap:16px}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 6}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .section{margin-bottom:44px}
  .card{padding:16px}
  .timeline__rail{grid-auto-columns:minmax(132px,1fr)}
}

@media (max-width:400px){
  .dock-bar__label{display:none}
  .footer-key{min-width:auto}
}

/* ---------- 19 可访问性与动效偏好 ---------- */
@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-behavior:auto !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .card:hover,.card:focus-within{transform:none}
  .btn:hover{transform:none}
  .chapter__num{opacity:1}
  .to-top{transform:none}
}