/* ============================================================
   云开娱乐 · 赛程数据中心 / 共享样式 site.css
   1 reset  2 变量  3 中文排版  4 布局与骨架  5 通用组件
   6 头部  7 页脚  8 动效与工具类  9 响应式  10 可访问性
   ============================================================ */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h,70px) + 24px)}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{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%}
hr{border:0}

/* ---------- 2. 变量 ---------- */
:root{
  --ink-900:#05070E;
  --ink-800:#0B1324;
  --ink-700:#16203A;
  --line:#26325A;
  --line-soft:rgba(38,50,90,.55);
  --white:#F4F7FF;
  --soft:#C9D3E8;
  --muted:#93A0BC;
  --cyan:#22E8D0;
  --orange:#FF6A1E;
  --yellow:#FFC53D;
  --focus:#4B7BFF;

  --cyan-08:rgba(34,232,208,.08);
  --cyan-16:rgba(34,232,208,.18);
  --orange-10:rgba(255,106,30,.10);
  --white-04:rgba(244,247,255,.04);
  --white-08:rgba(244,247,255,.08);

  --font-sans:"Noto Sans SC","PingFang SC","Source Han Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","DIN Alternate","SFMono-Regular",ui-monospace,Menlo,Consolas,"Courier New",monospace;

  --fs-12:12px; --fs-13:13px; --fs-16:16px; --fs-18:18px;
  --fs-24:24px; --fs-34:34px; --fs-52:52px; --fs-84:84px; --fs-140:140px;
  --fs-body:clamp(16px,0.35vw + 15px,18px);
  --fs-display:clamp(32px,5.2vw,68px);
  --fs-num:clamp(84px,13vw,220px);
  --lh-tight:1.08;
  --lh-body:1.9;
  --tracking-annot:.08em;

  --r-xs:4px; --r-sm:10px; --r-md:14px; --r-lg:22px; --r-pill:999px;

  --sp-1:4px; --sp-2:8px; --sp-3:12px; --sp-4:16px; --sp-5:24px;
  --sp-6:32px; --sp-7:48px; --sp-8:64px; --sp-9:96px; --sp-10:140px;

  --shadow-paper:0 22px 48px -30px rgba(0,0,0,.98);
  --w-max:1400px;
  --header-h:70px;
}

/* ---------- 3. 中文排版与全局基底 ---------- */
body{
  background:var(--ink-900);
  color:var(--white);
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  line-height:var(--lh-body);
  letter-spacing:.01em;
  font-weight:400;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(900px 520px at 88% -10%,rgba(34,232,208,.10),transparent 62%),
    radial-gradient(760px 460px at 4% 10%,rgba(75,123,255,.09),transparent 60%),
    radial-gradient(600px 400px at 50% 120%,rgba(255,106,30,.05),transparent 65%);
}
main{position:relative;z-index:1;padding-top:var(--header-h)}
#main-content{outline:none}
h1,h2,h3,h4{line-height:1.2;font-weight:800;letter-spacing:-.01em}
h1{font-size:var(--fs-display);letter-spacing:-.02em;line-height:var(--lh-tight)}
h2{font-size:clamp(24px,2.6vw,34px)}
h3{font-size:var(--fs-24)}
h4{font-size:var(--fs-18)}
p{max-width:74ch}
::selection{background:var(--cyan);color:#04120F}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--ink-900)}
::-webkit-scrollbar-thumb{background:#1E2A4A;border-radius:6px;border:2px solid var(--ink-900)}
::-webkit-scrollbar-thumb:hover{background:#2C3C68}

.display{font-size:var(--fs-display);font-weight:800;line-height:var(--lh-tight);letter-spacing:-.02em;text-align:left}
.display--accent{color:var(--cyan)}
.lede{font-size:clamp(16px,1.1vw + 14px,19px);line-height:1.85;color:var(--soft);max-width:62ch}
.eyebrow{font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.2em;text-transform:uppercase;color:var(--cyan)}
.annot{font-size:var(--fs-13);letter-spacing:var(--tracking-annot);color:var(--muted)}
.side-note{
  position:absolute;top:0;right:0;
  writing-mode:vertical-rl;text-orientation:mixed;
  font-size:var(--fs-13);letter-spacing:.28em;color:var(--muted);
  padding-block:4px;border-inline-start:1px solid var(--line);
}
.num{
  font-family:var(--font-mono);font-weight:800;font-style:normal;
  font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1;
  letter-spacing:-.03em;line-height:.9;
}
.num--hero{font-size:var(--fs-num);color:var(--white)}
.num--cyan{color:var(--cyan)}
.num--orange{color:var(--orange)}
.num--sm{font-size:var(--fs-34)}
.prose{max-width:68ch;color:var(--soft);line-height:var(--lh-body)}
.prose>*+*{margin-top:1.1em}
.prose h2,.prose h3{color:var(--white);margin-top:2.2em}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:4px}
.prose strong{color:var(--white);
}

/* ---------- 4. 布局与骨架 ---------- */
.wrap{width:100%;max-width:var(--w-max);margin:0 auto;padding-inline:clamp(18px,4vw,56px)}
.wrap--narrow{max-width:900px}
.grid{display:grid;grid-template-columns:1fr;gap:clamp(16px,2.2vw,28px)}
.grid--tight{gap:var(--sp-3)}
.section{padding-block:clamp(56px,8vw,124px)}
.section--tight{padding-block:clamp(36px,5vw,68px)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:var(--sp-3) var(--sp-5);
  padding-bottom:var(--sp-4);margin-bottom:clamp(28px,4vw,52px);
  border-bottom:1px solid var(--line-soft);
}
.section__head>*:last-child{margin-inline-start:auto}
.hairline{height:1px;background:var(--line);width:100%}
.hairline--cyan{background:linear-gradient(90deg,var(--cyan),rgba(34,232,208,0) 70%)}
.band{
  display:flex;gap:clamp(14px,2vw,24px);
  overflow-x:auto;padding:6px 4px 20px;
  scroll-snap-type:x proximity;
}
.band>*{flex:0 0 clamp(240px,30vw,340px);scroll-snap-align:start}
.band--wide>*{flex-basis:clamp(300px,42vw,460px)}
.band::-webkit-scrollbar{height:6px}
.band::-webkit-scrollbar-thumb{background:var(--line);border-radius:3px}

/* ---------- 5. 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:var(--ink-700);color:var(--white);
  font-size:15px;font-weight:600;letter-spacing:.01em;line-height:1.2;
  transition:transform .12s ease,border-color .12s ease,background-color .12s ease,color .12s ease;
}
.btn:hover{transform:translateY(-2px);border-color:var(--cyan);color:var(--cyan)}
.btn--primary{background:var(--orange);border-color:var(--orange);color:#0B0400;font-weight:700}
.btn--primary:hover{background:#ff8244;border-color:#ff8244;color:#0B0400}
.btn--ghost{background:transparent;color:var(--soft)}
.btn--ghost:hover{color:var(--cyan);border-color:var(--cyan)}
.btn--quiet{border-color:transparent;background:transparent;color:var(--cyan);padding-inline:2px;text-decoration:underline;text-underline-offset:5px}
.btn--quiet:hover{transform:none}

.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.05em;color:var(--muted)}
.crumb a:hover{color:var(--cyan)}
.crumb__sep{color:var(--line)}
.crumb [aria-current="page"]{color:var(--white)}

.panel{background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-lg);padding:clamp(20px,2.6vw,36px)}
.card{
  position:relative;background:var(--ink-700);border:1px solid var(--line);
  border-radius:var(--r-md);padding:clamp(18px,2vw,26px);
  transition:transform .12s ease,border-color .12s ease,box-shadow .12s ease;
}
.card:hover{transform:translateY(-4px);border-color:var(--cyan);box-shadow:var(--shadow-paper)}
.card--paper{box-shadow:10px 10px 0 -1px var(--ink-800),11px 11px 0 0 var(--line)}
.card--paper:hover{box-shadow:10px 10px 0 -1px var(--ink-800),11px 11px 0 0 var(--cyan)}

.tag{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:var(--fs-12);letter-spacing:.12em;text-transform:uppercase;
  padding:5px 10px;border-radius:var(--r-xs);
  border:1px solid var(--line);background:var(--white-04);color:var(--muted);
}
.tag--cyan{color:var(--cyan);border-color:var(--cyan-16);background:var(--cyan-08)}
.tag--orange{color:var(--orange);border-color:rgba(255,106,30,.42);background:var(--orange-10)}
.tag--yellow{color:var(--yellow);border-color:rgba(255,197,61,.4);background:rgba(255,197,61,.08)}
.tag--tape{transform:rotate(-1.6deg);box-shadow:0 3px 0 rgba(5,7,14,.6)}

.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  font-size:14px;padding:8px 16px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:transparent;color:var(--muted);
  transition:color .12s ease,border-color .12s ease,background-color .12s ease;
}
.chip:hover{color:var(--white);border-color:var(--focus)}
.chip[aria-pressed="true"]{color:var(--cyan);border-color:var(--cyan);background:var(--cyan-08)}

.timeline{position:relative;display:grid;gap:clamp(24px,3vw,40px);padding-inline-start:30px}
.timeline::before{content:"";position:absolute;left:10px;top:6px;bottom:6px;width:1px;background:linear-gradient(180deg,var(--cyan),var(--line) 55%,rgba(38,50,90,0))}
.timeline__item{position:relative}
.timeline__item::before{
  content:"";position:absolute;left:-25px;top:9px;width:11px;height:11px;border-radius:50%;
  background:var(--ink-900);border:2px solid var(--cyan);
}
.timeline__mark{font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.08em;color:var(--cyan);display:block;margin-bottom:6px}

.stat-row{display:flex;flex-wrap:wrap;gap:clamp(20px,4vw,56px)}
.stat{display:flex;flex-direction:column;gap:6px;min-width:110px}
.stat__num{font-family:var(--font-mono);font-weight:800;font-variant-numeric:tabular-nums;font-size:clamp(34px,5vw,64px);line-height:1;color:var(--white)}
.stat__label{font-size:var(--fs-13);letter-spacing:var(--tracking-annot);color:var(--muted)}
.stat--cyan .stat__num{color:var(--cyan)}
.stat--orange .stat__num{color:var(--orange)}
[data-count]{font-variant-numeric:tabular-nums}

.media-frame{
  position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--r-md);
  background:
    linear-gradient(135deg,var(--ink-700) 0%,var(--ink-900) 100%);
  aspect-ratio:16/9;
}
.media-frame>img,.media-frame>picture>img{width:100%;height:100%;object-fit:cover;filter:saturate(.88) contrast(1.06)}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(5,7,14,.06),rgba(5,7,14,.62));
}
.media-frame__cap{position:absolute;inset-inline:14px;bottom:12px;z-index:1;font-size:var(--fs-13);letter-spacing:.06em;color:var(--soft)}
.media-frame--band{aspect-ratio:3/1}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}

.accordion{border-top:1px solid var(--line)}
.accordion details{border-bottom:1px solid var(--line)}
.accordion summary{
  position:relative;cursor:pointer;list-style:none;
  padding:20px 46px 20px 0;font-size:var(--fs-18);font-weight:600;color:var(--white);
  transition:color .12s ease;
}
.accordion summary::-webkit-details-marker{display:none}
.accordion summary:hover{color:var(--cyan)}
.accordion summary::after{
  content:"+";position:absolute;right:8px;top:50%;transform:translateY(-50%);
  font-family:var(--font-mono);font-size:20px;color:var(--cyan);
}
.accordion details[open]>summary::after{content:"−"}
.accordion__body{padding:0 46px 24px 0;color:var(--soft)}

/* ---------- 6. 头部 ---------- */
.skip-link{
  position:absolute;left:16px;top:-70px;z-index:130;
  padding:12px 18px;border-radius:var(--r-pill);
  background:var(--cyan);color:#04120F;font-weight:700;font-size:14px;
  transition:top .16s ease;
}
.skip-link:focus{top:14px}
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  background:rgba(5,7,14,.74);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
  border-bottom:1px solid rgba(38,50,90,.75);
  transition:background-color .18s ease,box-shadow .18s ease;
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,rgba(34,232,208,0),rgba(34,232,208,.5),rgba(255,106,30,.28),rgba(255,106,30,0));
}
.site-header[data-stuck]{background:rgba(5,7,14,.94);box-shadow:0 24px 50px -34px rgba(0,0,0,1)}
.header-rail{
  max-width:var(--w-max);margin:0 auto;
  padding:13px clamp(16px,3.2vw,48px);
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;color:var(--white)}
.brand__mark{
  display:grid;place-items:center;width:42px;height:42px;flex:0 0 auto;
  border-radius:var(--r-xs);border:1px solid var(--line);background:var(--ink-700);
  font-family:var(--font-mono);font-weight:800;font-size:16px;color:var(--cyan);
  box-shadow:inset 0 0 0 1px rgba(34,232,208,.14);
}
.brand__text{display:flex;flex-direction:column;line-height:1.22}
.brand__name{font-size:16px;font-weight:800;letter-spacing:.02em}
.brand__sub{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--muted)}
.brand:hover .brand__mark{border-color:var(--cyan)}
.header-actions{display:flex;align-items:center;gap:12px;margin-inline-start:auto}
.capsule-nav{
  display:flex;align-items:center;padding:5px;
  border-radius:var(--r-pill);border:1px solid var(--line);
  background:rgba(11,19,36,.88);
  box-shadow:0 14px 34px -26px rgba(0,0,0,1);
  overflow-x:auto;scrollbar-width:none;
}
.capsule-nav::-webkit-scrollbar{display:none}
.capsule-nav__list{display:flex;align-items:center;gap:2px}
.capsule-nav__link{
  display:block;padding:9px 15px;border-radius:var(--r-pill);
  font-size:14px;color:var(--muted);white-space:nowrap;
  transition:color .12s ease,background-color .12s ease,box-shadow .12s ease;
}
.capsule-nav__link:hover{color:var(--white);background:var(--cyan-08)}
.capsule-nav__link[aria-current="page"]{
  color:var(--cyan);background:var(--cyan-08);
  box-shadow:inset 0 0 0 1px var(--cyan);
}
.version-chip{
  display:inline-flex;align-items:center;gap:8px;flex:0 0 auto;
  padding:8px 14px;border-radius:var(--r-pill);
  border:1px solid rgba(255,106,30,.42);background:var(--orange-10);
  font-family:var(--font-mono);font-size:var(--fs-12);letter-spacing:.06em;color:var(--orange);
  transition:border-color .12s ease,background-color .12s ease;
}
.version-chip:hover{border-color:var(--orange);background:rgba(255,106,30,.18)}
.version-chip__label{font-family:var(--font-sans);color:var(--muted);letter-spacing:.04em}
.version-chip__num{font-weight:800;font-variant-numeric:tabular-nums}
.nav-toggle{
  display:none;position:relative;width:46px;height:46px;flex:0 0 auto;
  border-radius:var(--r-pill);border:1px solid var(--line);background:var(--ink-800);
}
.nav-toggle__bars{
  position:absolute;inset:0;margin:auto;width:20px;height:2px;border-radius:2px;
  background:var(--white);transition:background-color .12s ease;
}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:20px;height:2px;border-radius:2px;background:var(--white);
  transition:transform .16s ease,background-color .16s ease;
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg);background:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg);background:var(--cyan)}
.nav-scrim{
  position:fixed;inset:0;z-index:80;background:rgba(5,7,14,.74);
  opacity:0;visibility:hidden;transition:opacity .18s ease,visibility .18s ease;
}
.nav-scrim[data-visible]{opacity:1;visibility:visible}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;z-index:1;margin-top:clamp(64px,10vw,140px);
  background:var(--ink-900);border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto;height:2px;
  background:linear-gradient(90deg,rgba(34,232,208,.75),rgba(34,232,208,0) 38%,rgba(255,106,30,0) 62%,rgba(255,106,30,.7));
}
.footer-inner{
  max-width:var(--w-max);margin:0 auto;
  padding:clamp(44px,6vw,84px) clamp(18px,4vw,56px) clamp(26px,3.4vw,44px);
  display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:clamp(24px,4vw,56px);
}
.footer-brand__name{font-size:var(--fs-24);font-weight:800;letter-spacing:-.01em}
.footer-brand__domain{font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.04em;color:var(--muted);margin-top:8px}
.footer-brand__desc{margin-top:14px;max-width:34ch;font-size:15px;color:var(--soft);line-height:1.8}
.footer-brand .btn{margin-top:22px}
.footer-col__title{
  font-size:var(--fs-13);letter-spacing:.16em;color:var(--muted);
  margin-bottom:18px;text-transform:none;
}
.footer-col__list{display:grid;gap:12px}
.footer-col__list a{font-size:15px;color:var(--white);opacity:.88;transition:color .12s ease,opacity .12s ease}
.footer-col__list a::before{content:"/";margin-inline-end:8px;font-family:var(--font-mono);color:var(--line)}
.footer-col__list a:hover{color:var(--cyan);opacity:1}
.footer-base{
  max-width:var(--w-max);margin:0 auto;
  padding:clamp(20px,3vw,30px) clamp(18px,4vw,56px);
  border-top:1px solid var(--line-soft);
  display:flex;flex-wrap:wrap;gap:14px 32px;align-items:center;justify-content:space-between;
  font-size:var(--fs-13);color:var(--muted);
}
.footer-contact{display:flex;flex-wrap:wrap;gap:10px 22px;align-items:center;line-height:1.8}
.footer-contact__item{color:var(--soft)}
.copy-btn{
  padding:5px 12px;border-radius:var(--r-pill);
  border:1px solid var(--line);color:var(--muted);font-size:var(--fs-12);letter-spacing:.06em;
  transition:color .12s ease,border-color .12s ease;
}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan)}
.copy-btn[data-copied]{color:var(--cyan);border-color:var(--cyan);background:var(--cyan-08)}
.footer-legal{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center}
.footer-legal a{color:var(--muted);transition:color .12s ease}
.footer-legal a:hover{color:var(--cyan)}
.footer-icp{font-family:var(--font-mono);letter-spacing:.04em;color:#6F7C99}
.footer-note{
  max-width:var(--w-max);margin:0 auto;
  padding:0 clamp(18px,4vw,56px) clamp(30px,4vw,48px);
  font-size:var(--fs-12);line-height:1.9;letter-spacing:.02em;color:#6F7C99;
}

/* ---------- 8. 动效与工具类 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:120;pointer-events:none;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
}
.to-top{
  position:fixed;right:clamp(16px,3vw,32px);bottom:clamp(16px,3vw,32px);z-index:85;
  width:52px;height:52px;display:grid;place-items:center;
  border-radius:50%;border:1px solid var(--line);background:rgba(11,19,36,.94);
  color:var(--cyan);font-family:var(--font-mono);font-size:18px;
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease,border-color .12s ease;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--cyan)}
.to-top__arrow{line-height:1}
.reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.reveal[data-visible]{opacity:1;transform:none}
.toc-rail{
  position:fixed;right:clamp(14px,2vw,30px);top:50%;transform:translateY(-50%);z-index:70;
  display:flex;flex-direction:column;gap:12px;
  padding:16px 12px;border-radius:var(--r-pill);
  background:rgba(11,19,36,.7);border:1px solid var(--line);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.toc-rail__link{position:relative;display:block;width:8px;height:8px;border-radius:50%;background:var(--line);transition:background-color .16s ease,transform .16s ease,box-shadow .16s ease}
.toc-rail__link:hover{background:var(--focus)}
.toc-rail__link[aria-current="true"]{background:var(--cyan);transform:scale(1.35);box-shadow:0 0 0 4px var(--cyan-16)}
.toc-rail__text{
  position:absolute;right:22px;top:50%;transform:translateY(-50%);
  white-space:nowrap;font-size:var(--fs-12);letter-spacing:.08em;color:var(--soft);
  padding:5px 10px;border-radius:var(--r-xs);border:1px solid var(--line);background:var(--ink-800);
  opacity:0;pointer-events:none;transition:opacity .14s ease;
}
.toc-rail__link:hover .toc-rail__text,.toc-rail__link:focus-visible .toc-rail__text{opacity:1}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}
.is-hidden{display:none!important}
html.is-locked,html.is-locked body{overflow:hidden}

/* ---------- 9. 响应式 ---------- */
@media (min-width:760px){
  .grid{grid-template-columns:repeat(12,minmax(0,1fr))}
  .span-3{grid-column:span 3}
  .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-9{grid-column:span 9}
  .span-12{grid-column:span 12}
}
@media (min-width:901px){
  .stagger>*:nth-child(3n+2){margin-inline-start:16px}
  .stagger>*:nth-child(3n){margin-inline-start:32px}
}
@media (max-width:1200px){
  .toc-rail{display:none}
}
@media (max-width:1150px){
  .brand__sub{display:none}
  .capsule-nav__link{padding:8px 11px;font-size:13px}
}
@media (max-width:1000px){
  .footer-inner{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  :root{--header-h:66px}
  .site-header{
    -webkit-backdrop-filter:none;backdrop-filter:none;
    background:rgba(5,7,14,.96);
  }
  .header-rail{padding:11px clamp(16px,4vw,24px)}
  .nav-toggle{display:block}
  .version-chip__label{display:none}
  .capsule-nav{
    position:fixed;top:0;right:0;bottom:0;left:auto;z-index:95;
    width:min(340px,86vw);flex-direction:column;align-items:stretch;
    gap:0;padding:calc(var(--header-h) + 18px) 22px 32px;
    border:0;border-left:1px solid var(--line);border-radius:0;
    background:var(--ink-800);box-shadow:-34px 0 70px -46px #000;
    overflow-y:auto;
    transform:translateX(102%);transition:transform .22s ease;
  }
  .capsule-nav[data-open]{transform:translateX(0)}
  .capsule-nav__list{flex-direction:column;align-items:stretch;gap:6px}
  .capsule-nav__link{padding:14px 16px;font-size:16px;border-radius:var(--r-sm);box-shadow:none}
  .capsule-nav__link[aria-current="page"]{box-shadow:none;border:1px solid var(--cyan)}
  .capsule-nav__link:hover{background:var(--white-04)}
}
@media (max-width:760px){
  .footer-inner{grid-template-columns:1fr;gap:32px}
  .footer-base{flex-direction:column;align-items:flex-start}
  .side-note{position:static;writing-mode:horizontal-tb;border-inline-start:0;border-top:1px solid var(--line);padding-top:8px}
}
@media (max-width:420px){
  .brand__name{font-size:15px}
  .brand__mark{width:38px;height:38px}
}

/* ---------- 10. 可访问性 ---------- */
:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:var(--r-xs)}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--focus);outline-offset:3px}
@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;
  }
  .reveal{opacity:1;transform:none}
  .card:hover,.btn:hover{transform:none}
}