/* ==========================================================================
   安博体育官网 · 共享样式表 /assets/site.css
   视觉系统：赛场数据舱 —— 深墨绿底 · 荧光青数据 · 暖橙补时
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink-950:#05130F;
  --ink-900:#0A1F18;
  --ink-800:#0F2B22;
  --line:#1C4A3C;
  --line-soft:rgba(28,74,60,.55);
  --grid-line:rgba(28,74,60,.42);
  --cyan:#45F0D6;
  --cyan-soft:#A8FFF0;
  --cyan-dim:rgba(69,240,214,.14);
  --orange:#FF7A2F;
  --orange-soft:#FFC79A;
  --orange-dim:rgba(255,122,47,.13);
  --paper:#F2F7F3;
  --mist:#7C9A8F;
  --alert:#C4453C;

  --font-display:"Archivo Narrow","Oswald","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --wrap:1280px;
  --pad:clamp(16px,4vw,40px);
  --gap:clamp(12px,1.6vw,24px);
  --header-h:62px;
  --speed:.2s;
}

/* ---------- 2. Reset 与基础 ---------- */
*,
*::before,
*::after{box-sizing:border-box}

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

body{
  margin:0;
  background:var(--ink-950);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  font-weight:400;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}

img,svg,video,canvas{display:block;max-width:100%;height:auto}

a{color:var(--cyan-soft);text-decoration:none}
a:hover{color:var(--cyan)}
button{font:inherit;color:inherit}
ul,ol{margin:0}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:var(--cyan);color:var(--ink-950)}

:target{scroll-margin-top:calc(var(--header-h) + 20px)}

.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;
}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-200%);
  background:var(--cyan);color:var(--ink-950);
  padding:10px 18px;font-size:14px;font-weight:700;
  border:1px solid var(--cyan);
  transition:transform var(--speed) ease;
}
.skip-link:focus{transform:translateY(0);color:var(--ink-950)}

/* ---------- 3. 中文排版 ---------- */
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.12;
  letter-spacing:-.01em;
  color:var(--paper);
  text-wrap:balance;
}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
strong{font-weight:700}
small{font-size:13px}
time{font-family:var(--font-mono);font-size:.92em;letter-spacing:.02em}

.display{font-family:var(--font-display);font-weight:700;line-height:1.05;letter-spacing:-.015em}
.h-page{font-size:clamp(32px,5.4vw,56px)}
.h-2{font-size:clamp(22px,3vw,32px)}
.h-3{font-size:clamp(18px,2.2vw,20px)}
.h-4{font-size:17px}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cyan);
  margin:0 0 10px;
}
.lede{
  font-size:clamp(16px,1.6vw,19px);
  line-height:1.75;
  color:var(--mist);
  max-width:64ch;
  margin:0;
}
.mono{font-family:var(--font-mono);letter-spacing:.02em}

.sec-index{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(44px,7vw,88px);
  line-height:.82;
  letter-spacing:-.03em;
  color:var(--ink-800);
  -webkit-text-stroke:1px var(--line);
  display:block;
  margin:0 0 8px;
}
@supports not (-webkit-text-stroke:1px black){
  .sec-index{color:var(--line)}
}

.sec-head{margin-bottom:clamp(20px,3vw,36px)}
.sec-head__row{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:12px 24px;
  border-bottom:1px solid var(--line);
  padding-bottom:14px;
}

/* ---------- 4. 布局骨架 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding-left:var(--pad);
  padding-right:var(--pad);
}

.rail-layout{
  display:grid;
  grid-template-columns:minmax(0,3fr) minmax(0,9fr);
  gap:clamp(20px,3vw,48px);
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding-left:var(--pad);
  padding-right:var(--pad);
}

.rail{
  position:relative;
  border-right:1px solid var(--line);
  padding-right:clamp(12px,2vw,24px);
}
.rail__sticky{position:sticky;top:calc(var(--header-h) + 28px)}
.content-col{min-width:0}

.section{padding:clamp(40px,7vw,88px) 0;border-top:1px solid var(--line)}
.section:first-of-type{border-top:0}
.section--light{background:var(--paper);color:#0A1F18}
.section--light h1,
.section--light h2,
.section--light h3,
.section--light .display{color:#05130F}
.section--light .lede,
.section--light p{color:#26443A}
.section--light .sec-head__row{border-bottom-color:rgba(5,19,15,.2)}
.section--light .sec-index{color:transparent;-webkit-text-stroke:1px rgba(5,19,15,.28)}

.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}

.stack{display:grid;gap:var(--gap)}
.stack--tight{gap:8px}
.hairline{border:0;border-top:1px solid var(--line);margin:0}

/* ---------- 5. 通用组件 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  line-height:1.2;
  letter-spacing:.01em;
  color:var(--paper);
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:0;
  cursor:pointer;
  text-decoration:none;
  transition:background var(--speed) ease,color var(--speed) ease,border-color var(--speed) ease;
}
.btn:hover{color:var(--cyan);border-color:var(--cyan);background:var(--ink-900)}
.btn--primary{background:var(--cyan);color:var(--ink-950);border-color:var(--cyan)}
.btn--primary:hover{background:var(--cyan-soft);color:var(--ink-950);border-color:var(--cyan-soft)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--paper)}
.btn--ghost:hover{background:var(--cyan-dim);color:var(--cyan)}
.btn--orange{background:var(--orange);color:var(--ink-950);border-color:var(--orange)}
.btn--orange:hover{background:var(--orange-soft);color:var(--ink-950);border-color:var(--orange-soft)}
.btn--sm{padding:7px 12px;font-size:13px}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  background:rgba(28,74,60,.28);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  text-transform:uppercase;
  white-space:nowrap;
}
.tag--live{
  color:var(--orange);
  border-color:rgba(255,122,47,.5);
  background:var(--orange-dim);
}
.tag--sealed{
  color:var(--cyan-soft);
  border-color:rgba(69,240,214,.35);
  background:var(--cyan-dim);
}

.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--cyan);
  line-height:1.2;
}
.num--orange{color:var(--orange)}
.num--muted{color:var(--mist);font-weight:500}
.num--xl{font-size:clamp(28px,4vw,44px)}

@keyframes score-pulse{
  0%,88%{color:var(--cyan);text-shadow:none}
  92%{color:var(--cyan-soft);text-shadow:0 0 16px rgba(69,240,214,.6)}
  100%{color:var(--cyan);text-shadow:none}
}
.is-live{animation:score-pulse 4.5s ease-out infinite}

.panel{
  position:relative;
  background:var(--ink-900);
  border:1px solid var(--line);
  padding:clamp(16px,2vw,24px);
  overflow:hidden;
}
.panel--deep{background:var(--ink-800)}
.panel--cut{clip-path:polygon(0 0,calc(100% - 18px) 0,100% 18px,100% 100%,0 100%)}
.panel--grid::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(var(--grid-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:24px 24px;
  opacity:.55;
}
.panel > *{position:relative;z-index:1}

.card{
  position:relative;
  display:block;
  background:var(--ink-900);
  border:1px solid var(--line);
  padding:clamp(16px,2vw,22px);
  color:var(--paper);
  transition:border-color var(--speed) ease,background var(--speed) ease,transform var(--speed) ease;
}
.card:hover{border-color:var(--cyan);background:var(--ink-800)}
.card--wide{grid-column:span 2}
.card--tall{padding-bottom:clamp(28px,4vw,40px)}

.panel__title,
.card__title{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-size:19px;
  font-weight:700;
  letter-spacing:-.005em;
  color:var(--paper);
}
.card__meta{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--mist);
  letter-spacing:.03em;
}
.card__text{margin:8px 0 0;font-size:15px;color:var(--mist);line-height:1.7}

.track{
  display:grid;
  grid-auto-flow:column;
  grid-auto-columns:minmax(260px,1fr);
  gap:var(--gap);
  overflow-x:auto;
  padding-bottom:8px;
  scroll-snap-type:x proximity;
  scrollbar-width:thin;
  scrollbar-color:var(--line) transparent;
}
.track__item{scroll-snap-align:start}
.track::-webkit-scrollbar{height:6px}
.track::-webkit-scrollbar-track{background:transparent}
.track::-webkit-scrollbar-thumb{background:var(--line)}
.track__hint{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--mist);
  letter-spacing:.06em;
  margin:0 0 10px;
}

/* ---------- 6. 图像容器（页面阶段放置图片占位） ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  width:100%;
  aspect-ratio:16 / 10;
  background:linear-gradient(140deg,var(--ink-800) 0%,var(--ink-900) 55%,var(--ink-950) 100%);
  border:1px solid var(--line);
}
.media-frame > img,
.media-frame > video,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(var(--grid-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:32px 32px;
  opacity:.4;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--free{aspect-ratio:auto;min-height:220px}
.media-frame__cap{
  position:absolute;
  left:0;right:0;bottom:0;
  z-index:2;
  padding:10px 14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--cyan-soft);
  background:linear-gradient(transparent,rgba(5,19,15,.88));
}

/* ---------- 7. 面包屑与正文 ---------- */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
  margin:0 0 clamp(16px,2vw,26px);
}
.breadcrumb ol{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:0;
  margin:0;
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--line)}
.breadcrumb a{color:var(--mist)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--cyan-soft)}

.prose{
  font-size:17px;
  line-height:1.75;
  color:var(--paper);
  max-width:74ch;
}
.prose > * + *{margin-top:1em}
.prose h2{
  font-size:clamp(22px,3vw,30px);
  margin-top:1.8em;
  padding-top:18px;
  border-top:1px solid var(--line);
}
.prose h3{font-size:19px;margin-top:1.5em}
.prose ul,.prose ol{padding-left:1.25em}
.prose li{margin-bottom:.4em}
.prose a{
  color:var(--cyan-soft);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}
.prose a:hover{color:var(--cyan)}
.prose strong{color:var(--paper)}
.prose blockquote{
  margin:1.4em 0;
  padding:14px 18px;
  border-left:3px solid var(--orange);
  background:var(--ink-900);
  color:var(--mist);
}
.section--light .prose{color:#26443A}
.section--light .prose strong{color:#05130F}
.section--light .prose a{color:#0B6B58}

/* ---------- 8. 章节目录 ---------- */
.toc{
  list-style:none;
  padding:0;
  display:grid;
  gap:2px;
}
.toc__link{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:9px;
  align-items:baseline;
  padding:7px 9px;
  font-size:13px;
  line-height:1.5;
  color:var(--mist);
  border-left:2px solid transparent;
  transition:color var(--speed) ease,background var(--speed) ease,border-color var(--speed) ease;
}
.toc__link:hover{color:var(--paper);background:var(--ink-900)}
.toc__link[aria-current="true"]{
  color:var(--cyan);
  border-left-color:var(--cyan);
  background:var(--cyan-dim);
}
.toc__num{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.05em;
  color:var(--line);
}
.toc__link[aria-current="true"] .toc__num{color:var(--cyan)}

/* ---------- 9. 显现动效 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .48s ease,transform .48s cubic-bezier(.22,.7,.24,1);
}
.js [data-reveal].is-in{opacity:1;transform:none}
.no-motion [data-reveal]{opacity:1;transform:none;transition:none}

/* ---------- 10. 头部命令栏 ---------- */
.cmd-bar{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink-950);
  border-bottom:1px solid var(--line);
}
.cmd-bar__inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,32px);
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--pad);
  min-height:var(--header-h);
}

.cmd-brand{flex:0 0 auto;min-width:0}
.cmd-brand__link{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--paper);
  text-decoration:none;
}
.cmd-brand__link:hover{color:var(--paper)}
.cmd-brand__mark{
  width:26px;
  height:26px;
  flex:0 0 26px;
  background:var(--cyan);
  clip-path:polygon(0 0,100% 0,100% 66%,66% 100%,0 100%);
  position:relative;
}
.cmd-brand__mark::after{
  content:"";
  position:absolute;
  left:7px;top:7px;
  width:8px;height:8px;
  background:var(--ink-950);
}
.cmd-brand__text{display:flex;flex-direction:column;line-height:1.15}
.cmd-brand__name{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:700;
  letter-spacing:.02em;
}
.cmd-brand__note{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--mist);
}

.cmd-nav{
  flex:1 1 auto;
  min-width:0;
  display:flex;
  align-items:center;
}
.cmd-nav__list{
  list-style:none;
  display:flex;
  align-items:center;
  gap:2px;
  padding:0;
  margin:0;
  overflow-x:auto;
  scrollbar-width:none;
}
.cmd-nav__list::-webkit-scrollbar{display:none}
.cmd-nav__item{flex:0 0 auto}
.cmd-nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:7px;
  padding:9px 11px;
  font-size:14px;
  font-weight:500;
  color:var(--mist);
  white-space:nowrap;
  border-bottom:2px solid transparent;
  transition:color var(--speed) ease,background var(--speed) ease,border-color var(--speed) ease;
}
.cmd-nav__link:hover{color:var(--paper);background:var(--ink-900)}
.cmd-nav__index{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.08em;
  color:var(--line);
}
.cmd-nav__link[aria-current="page"]{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
}
.cmd-nav__link[aria-current="page"] .cmd-nav__index{color:var(--cyan)}

.cmd-nav__meta{display:none}

.cmd-bar__side{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:12px;
  margin-left:auto;
}
.cmd-status{
  display:flex;
  align-items:center;
  gap:8px;
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.03em;
  color:var(--mist);
  white-space:nowrap;
}
.cmd-status__dot{
  width:6px;
  height:6px;
  flex:0 0 6px;
  border-radius:50%;
  background:var(--orange);
  animation:pulse-dot 2.6s ease-out infinite;
}
@keyframes pulse-dot{
  0%{box-shadow:0 0 0 0 rgba(255,122,47,.55)}
  70%{box-shadow:0 0 0 7px rgba(255,122,47,0)}
  100%{box-shadow:0 0 0 0 rgba(255,122,47,0)}
}
.cmd-bar__cta{white-space:nowrap}

.cmd-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  padding:0;
  background:transparent;
  border:1px solid var(--line);
  border-radius:0;
  cursor:pointer;
  color:var(--paper);
  transition:border-color var(--speed) ease,background var(--speed) ease;
}
.cmd-toggle:hover{border-color:var(--cyan);background:var(--cyan-dim)}
.cmd-toggle__bars{
  display:flex;
  flex-direction:column;
  gap:4px;
  width:18px;
}
.cmd-toggle__bar{
  display:block;
  width:18px;
  height:2px;
  background:currentColor;
  transition:transform var(--speed) ease,opacity var(--speed) ease;
}
.cmd-bar[data-open] .cmd-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.cmd-bar[data-open] .cmd-toggle__bar:nth-child(2){opacity:0}
.cmd-bar[data-open] .cmd-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.scroll-progress{
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
}

/* ---------- 11. 页脚 ---------- */
.ft{
  margin-top:auto;
  background:var(--ink-950);
  border-top:1px solid var(--line);
  color:var(--paper);
}
.ft__inner{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(32px,5vw,64px) var(--pad) 28px;
}
.ft__top{
  display:grid;
  grid-template-columns:minmax(220px,4fr) repeat(3,minmax(0,3fr));
  gap:clamp(20px,3vw,40px);
}
.ft__mark{
  margin:0;
  font-family:var(--font-display);
  font-size:20px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--paper);
}
.ft__brand-note{
  margin:5px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--cyan);
}
.ft__brand-desc{
  margin:14px 0 0;
  font-size:14px;
  line-height:1.7;
  color:var(--mist);
  max-width:34ch;
}
.ft__col-title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
}
.ft__links{
  list-style:none;
  padding:0;
  display:grid;
  gap:9px;
}
.ft__link{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-size:14px;
  color:var(--paper);
  border-bottom:1px solid transparent;
  transition:color var(--speed) ease,border-color var(--speed) ease;
}
.ft__link::before{
  content:"";
  width:5px;
  height:5px;
  flex:0 0 5px;
  background:var(--line);
  transition:background var(--speed) ease;
}
.ft__link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.ft__link:hover::before{background:var(--cyan)}

.ft__contact{
  margin-top:clamp(28px,4vw,44px);
  padding-top:20px;
  border-top:1px solid var(--line);
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:10px 32px;
}
.ft__contact-line{
  margin:0;
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:9px;
  font-size:14px;
  color:var(--paper);
}
.ft__contact-key{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}
.ft__contact-val{font-family:var(--font-mono);letter-spacing:.02em;color:var(--paper)}
.ft__contact-line--note{
  grid-column:1 / -1;
  font-size:13px;
  color:var(--mist);
}

.ft__bottom{
  margin-top:24px;
  padding-top:18px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.03em;
  color:var(--mist);
}
.ft__copy{margin:0}
.ft__legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.ft__legal a{
  color:var(--mist);
  border-bottom:1px solid var(--line);
  transition:color var(--speed) ease,border-color var(--speed) ease;
}
.ft__legal a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.ft__icp{margin:0}
.ft__note{
  margin:16px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.7;
  letter-spacing:.02em;
  color:rgba(124,154,143,.72);
}

/* ---------- 12. 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(12px,3vw,28px);
  bottom:clamp(12px,3vw,28px);
  z-index:75;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:0;
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:16px;
  line-height:1;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .24s ease,transform .24s ease,visibility .24s ease,border-color var(--speed) ease,background var(--speed) ease;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--cyan);background:var(--cyan-dim)}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1180px){
  .cmd-status--desk{display:none}
}

@media (max-width:900px){
  :root{--header-h:56px}

  .cmd-bar__inner{gap:10px}
  .cmd-brand__note{display:none}
  .cmd-bar__cta{display:none}
  .cmd-toggle{display:inline-flex}

  .cmd-nav{
    position:fixed;
    top:var(--header-h);
    left:0;
    right:0;
    max-height:calc(100vh - var(--header-h));
    max-height:calc(100dvh - var(--header-h));
    display:block;
    overflow-y:auto;
    background:var(--ink-900);
    border-bottom:1px solid var(--line);
    padding:10px var(--pad) 24px;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity var(--speed) ease,transform var(--speed) ease,visibility var(--speed) ease;
  }
  .cmd-bar[data-open] .cmd-nav{
    opacity:1;
    visibility:visible;
    transform:none;
    pointer-events:auto;
  }
  .cmd-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    overflow:visible;
  }
  .cmd-nav__item{width:100%}
  .cmd-nav__link{
    width:100%;
    justify-content:flex-start;
    gap:12px;
    padding:14px 4px;
    font-size:16px;
    border-bottom:1px solid var(--line);
    border-left:2px solid transparent;
  }
  .cmd-nav__link[aria-current="page"]{border-bottom-color:var(--line);border-left-color:var(--cyan)}
  .cmd-nav__meta{
    display:grid;
    gap:12px;
    margin-top:18px;
  }
  .cmd-nav__cta{width:100%}

  .rail-layout{grid-template-columns:1fr;gap:22px}
  .rail{
    border-right:0;
    border-bottom:1px solid var(--line);
    padding-right:0;
    padding-bottom:16px;
  }
  .rail__sticky{position:static}
  .toc{
    grid-auto-flow:column;
    grid-auto-columns:max-content;
    overflow-x:auto;
    gap:6px;
    padding-bottom:6px;
    scrollbar-width:none;
  }
  .toc::-webkit-scrollbar{display:none}
  .toc__link{
    border-left:0;
    border-bottom:2px solid transparent;
    white-space:nowrap;
    padding:7px 10px;
  }
  .toc__link[aria-current="true"]{
    border-left:0;
    border-bottom-color:var(--cyan);
  }

  .grid--2,.grid--3{grid-template-columns:1fr}
  .card--wide{grid-column:auto}

  .ft__top{grid-template-columns:1fr 1fr}
  .ft__brand{grid-column:1 / -1}
}

@media (max-width:560px){
  .ft__top{grid-template-columns:1fr}
  .ft__bottom{flex-direction:column;align-items:flex-start}
  .cmd-brand__name{font-size:16px}
  .media-frame{aspect-ratio:3 / 2}
}

/* ---------- 14. 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .cmd-status__dot{animation:none}
  .is-live{animation:none}
}