/* ============================================================
   奥迪电玩 · 共享样式 /assets/site.css
   主题：夜间电竞数据舱
   ============================================================ */

/* ---------- 1 Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,dl,dt,dd,figure,blockquote,table{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video{display:block;max-width:100%;}
a{color:inherit;}
button,input,select,textarea{font:inherit;color:inherit;}
table{border-collapse:collapse;border-spacing:0;}
[hidden]{display:none !important;}

/* ---------- 2 变量 ---------- */
:root{
  --ink-0:#0B0E13;
  --ink-1:#12161F;
  --line:#1C2230;
  --line-strong:#2A3244;
  --red:#E4002B;
  --cyan:#00E5FF;
  --violet:#B14BFF;
  --teal:#0E3B3A;
  --wine:#3A0E1A;
  --indigo:#241A4D;
  --text:#E8EDF5;
  --muted:#8A94A6;
  --amber:#F5C24B;

  --font-head:Oswald,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:Inter,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,"Courier New",monospace;

  --shadow-hard:8px 8px 0 rgba(0,0,0,.5);
  --shadow-hard-sm:5px 5px 0 rgba(0,0,0,.5);
  --edge:2px solid var(--line);
  --radius:4px;
  --container:1240px;
  --header-main-h:68px;
  --header-main-h-compact:56px;
}

/* ---------- 3 基础排版 ---------- */
body{
  min-height:100%;
  background-color:var(--ink-0);
  background-image:
    linear-gradient(to right, rgba(28,34,48,.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28,34,48,.5) 1px, transparent 1px),
    radial-gradient(120% 70% at 8% -10%, rgba(0,229,255,.10), transparent 58%),
    radial-gradient(90% 60% at 94% 0%, rgba(177,75,255,.09), transparent 60%),
    linear-gradient(180deg,#0B0E13 0%,#090C11 55%,#0B0E13 100%);
  background-size:72px 72px,72px 72px,100% 100%,100% 100%,100% 100%;
  background-repeat:repeat,repeat,no-repeat,no-repeat,no-repeat;
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.06;
}
h1{font-size:clamp(40px,6vw,84px);}
h2{font-size:clamp(28px,3.4vw,48px);}
h3{font-size:clamp(20px,2vw,28px);font-weight:800;}
p{max-width:42em;}
.num,.mono{font-family:var(--font-mono);letter-spacing:.02em;}
::selection{background:var(--red);color:#fff;}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;}

/* ---------- 4 跳过链接 ---------- */
.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:200;
  padding:10px 18px;
  background:var(--red);
  color:#fff;
  font-family:var(--font-mono);
  font-size:13px;
  text-decoration:none;
  border-radius:0 0 var(--radius) 0;
}
.skip-link:focus{left:0;}

/* ---------- 5 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(11,14,19,.96);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.site-header[data-scrolled]{
  border-bottom-color:var(--line-strong);
  box-shadow:0 16px 32px rgba(0,0,0,.55);
}

.header-top{
  position:relative;
  z-index:3;
  max-height:64px;
  overflow:hidden;
  background:var(--ink-0);
  border-bottom:1px solid var(--line);
  transition:max-height .34s cubic-bezier(.22,.8,.3,1),opacity .2s linear,border-color .2s linear;
}
.header-top__inner{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:7px 24px;
  min-height:46px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.site-header[data-scrolled] .header-top{
  max-height:0;
  opacity:0;
  border-bottom-color:transparent;
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--text);
}
.brand__mark{
  flex:0 0 auto;
  width:14px;
  height:26px;
  border:2px solid var(--red);
  background:linear-gradient(180deg,var(--red) 0 34%,transparent 34% 66%,var(--red) 66% 100%);
  transform:skewY(-12deg);
  box-shadow:3px 3px 0 rgba(0,0,0,.6);
}
.brand__text{display:flex;flex-direction:column;line-height:1.25;}
.brand__name{
  font-family:var(--font-head);
  font-weight:900;
  font-size:20px;
  letter-spacing:.05em;
}
.brand__tag{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.02em;
  color:var(--muted);
}

.telemetry{display:flex;align-items:center;gap:18px;}
.telemetry__item{display:flex;align-items:baseline;gap:8px;}
.telemetry__key{
  margin:0;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--muted);
}
.telemetry__val{
  margin:0;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
  color:var(--cyan);
}

.header-main{position:static;}
.header-main__inner{
  position:relative;
  z-index:3;
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
  min-height:var(--header-main-h);
  display:flex;
  align-items:center;
  gap:18px;
  background:var(--ink-0);
  transition:min-height .28s ease;
}
.site-header[data-scrolled] .header-main__inner{min-height:var(--header-main-h-compact);}

.nav{flex:1 1 auto;}
.nav__list{display:flex;align-items:center;flex-wrap:wrap;gap:2px;}
.nav__item{display:block;}
.nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:7px;
  padding:10px 12px;
  color:var(--text);
  font-size:15px;
  font-weight:500;
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .18s ease,background-color .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.nav__index{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--muted);
  transition:color .18s ease;
}
.nav__link:hover{
  color:#fff;
  background:rgba(0,229,255,.08);
  box-shadow:inset 0 -2px 0 var(--cyan);
}
.nav__link:hover .nav__index{color:var(--cyan);}
.nav__link[aria-current="page"]{
  color:#fff;
  border-bottom-color:var(--red);
  background:rgba(228,0,43,.10);
}
.nav__link[aria-current="page"] .nav__index{color:var(--red);}

.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
}

/* ---------- 6 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border:2px solid var(--line);
  border-radius:var(--radius);
  background:var(--ink-1);
  color:var(--text);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease,color .16s ease,border-color .16s ease;
}
.btn:hover{transform:translate(-2px,-2px);}
.btn:active{transform:translate(0,0);}
.btn--primary{
  background:var(--red);
  border-color:#000;
  color:#fff;
  font-weight:700;
  box-shadow:var(--shadow-hard-sm);
}
.btn--primary:hover{background:#FF1B45;box-shadow:var(--shadow-hard);}
.btn--ghost{
  background:transparent;
  border-color:var(--cyan);
  color:var(--cyan);
  box-shadow:5px 5px 0 rgba(0,229,255,.14);
}
.btn--ghost:hover{background:rgba(0,229,255,.1);box-shadow:8px 8px 0 rgba(0,229,255,.18);}
.header-cta{white-space:nowrap;}

/* ---------- 7 移动导航开关 ---------- */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  background:var(--ink-1);
  border:2px solid var(--line);
  border-radius:var(--radius);
  color:var(--text);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  cursor:pointer;
}
.nav-toggle__bars{display:grid;gap:4px;width:18px;}
.nav-toggle__bars span{
  display:block;
  height:2px;
  background:var(--cyan);
  transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle[aria-expanded="true"]{border-color:var(--red);}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

/* ---------- 8 阅读进度条 ---------- */
.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  z-index:4;
  overflow:hidden;
}
.scroll-meter__fill{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--red),var(--violet) 48%,var(--cyan));
  transition:transform .12s linear;
}

/* ---------- 9 通用布局 ---------- */
.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}
.section{position:relative;padding:72px 0;}
.section--tight{padding:44px 0;}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:12px;
  padding-bottom:16px;
  margin-bottom:28px;
  border-bottom:1px solid var(--line);
}
.section-head__title{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(28px,3.4vw,48px);
  line-height:1.04;
  letter-spacing:-.02em;
}
.section-head__note{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--cyan);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  background:var(--red);
  transform:skewX(-24deg);
}
.lede{
  font-size:clamp(17px,2vw,21px);
  line-height:1.72;
  color:var(--text);
}

.rail{
  height:2px;
  width:100%;
  background:linear-gradient(90deg,transparent,var(--red) 18%,var(--violet) 52%,var(--cyan) 84%,transparent);
}

.grid{
  display:grid;
  gap:24px;
  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-12{grid-column:span 12;}

/* ---------- 10 珠宝色分区 ---------- */
.zone{position:relative;padding:64px 0;}
.zone::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(118deg,rgba(0,229,255,.07),transparent 44%);
}
.zone--teal{background:linear-gradient(180deg,rgba(14,59,58,.62),rgba(14,59,58,.16));}
.zone--wine{background:linear-gradient(180deg,rgba(58,14,26,.68),rgba(58,14,26,.18));}
.zone--indigo{background:linear-gradient(180deg,rgba(36,26,77,.68),rgba(36,26,77,.18));}

/* ---------- 11 面板与数据锚点 ---------- */
.panel{
  position:relative;
  padding:22px;
  background:var(--ink-1);
  border:var(--edge);
  border-radius:var(--radius);
  box-shadow:var(--shadow-hard);
}
.panel--teal{
  background:linear-gradient(160deg,rgba(14,59,58,.92),var(--ink-1) 72%);
  border-color:#17524F;
}
.panel--wine{
  background:linear-gradient(160deg,rgba(58,14,26,.94),var(--ink-1) 72%);
  border-color:#5C1A2B;
}
.panel--indigo{
  background:linear-gradient(160deg,rgba(36,26,77,.94),var(--ink-1) 72%);
  border-color:#3B2C78;
}
.panel__title{
  font-family:var(--font-head);
  font-weight:800;
  font-size:clamp(20px,2vw,28px);
  letter-spacing:-.01em;
  line-height:1.15;
}
.panel__body{margin-top:10px;color:var(--muted);font-size:15px;}

.stat{display:flex;flex-direction:column;gap:6px;}
.stat__value{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(30px,4.4vw,56px);
  line-height:1;
  letter-spacing:.02em;
  color:var(--text);
}
.stat__value--cyan{color:var(--cyan);}
.stat__value--violet{color:var(--violet);}
.stat__value--red{color:var(--red);}
.stat__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--muted);
}

.meter-ring{
  --p:0;
  position:relative;
  width:clamp(96px,14vw,132px);
  aspect-ratio:1;
  border-radius:50%;
  display:grid;
  place-items:center;
  background:conic-gradient(var(--cyan) calc(var(--p) * 1%),var(--line) 0);
  box-shadow:0 0 0 2px rgba(0,229,255,.14);
}
.meter-ring::after{
  content:"";
  position:absolute;
  inset:10px;
  border-radius:50%;
  background:var(--ink-1);
}
.meter-ring__value{
  position:relative;
  z-index:1;
  font-family:var(--font-mono);
  font-size:clamp(16px,1.8vw,22px);
  color:var(--cyan);
}

/* ---------- 12 表格 ---------- */
.table-wrap{
  width:100%;
  overflow-x:auto;
  border:var(--edge);
  border-radius:var(--radius);
  background:var(--ink-1);
  box-shadow:var(--shadow-hard);
}
.data-table{width:100%;min-width:560px;font-size:14px;}
.data-table caption{
  padding:14px 16px;
  text-align:left;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
  border-bottom:1px solid var(--line);
}
.data-table th{
  padding:12px 14px;
  text-align:left;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.1em;
  color:var(--muted);
  background:rgba(28,34,48,.45);
  border-bottom:1px solid var(--line);
  white-space:nowrap;
}
.data-table td{
  padding:12px 14px;
  border-bottom:1px solid var(--line);
  color:var(--text);
  vertical-align:top;
}
.data-table tbody tr{transition:background-color .16s ease,box-shadow .16s ease;}
.data-table tbody tr:hover{
  background:rgba(0,229,255,.07);
  box-shadow:inset 3px 0 0 var(--cyan);
}
.data-table tbody tr:last-child td{border-bottom:0;}
.data-table .num{font-family:var(--font-mono);color:var(--cyan);}

.copy-btn{
  padding:4px 8px;
  background:transparent;
  border:1px solid var(--line);
  border-radius:3px;
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  cursor:pointer;
  transition:color .16s ease,border-color .16s ease;
}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan);}
.copy-btn[data-copied]{color:var(--cyan);border-color:var(--cyan);}

/* ---------- 13 折叠面板 ---------- */
.accordion{
  border:var(--edge);
  border-radius:var(--radius);
  background:var(--ink-1);
  overflow:hidden;
  box-shadow:var(--shadow-hard);
}
.accordion__item{border-bottom:1px solid var(--line);}
.accordion__item:last-child{border-bottom:0;}
.accordion__trigger{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 18px;
  background:transparent;
  border:0;
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:600;
  text-align:left;
  cursor:pointer;
  transition:background-color .16s ease,color .16s ease;
}
.accordion__trigger:hover{background:rgba(0,229,255,.06);}
.accordion__trigger::after{
  content:"+";
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:18px;
  color:var(--cyan);
}
.accordion__item[data-open] .accordion__trigger{color:#fff;box-shadow:inset 3px 0 0 var(--red);}
.accordion__item[data-open] .accordion__trigger::after{content:"–";color:var(--red);}
.accordion__panel{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows .3s ease;
}
.accordion__item[data-open] .accordion__panel{grid-template-rows:1fr;}
.accordion__inner{
  overflow:hidden;
  visibility:hidden;
  transition:visibility .3s linear;
}
.accordion__item[data-open] .accordion__inner{visibility:visible;}
.accordion__inner > *{
  padding:0 18px 18px;
  color:var(--muted);
  font-size:15px;
}

/* ---------- 14 筛选器 ---------- */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.filter-btn{
  padding:8px 14px;
  background:var(--ink-1);
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  cursor:pointer;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.filter-btn:hover{color:var(--cyan);border-color:var(--cyan);}
.filter-btn[aria-pressed="true"]{
  background:var(--red);
  border-color:var(--red);
  color:#fff;
}
.filter-count{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--muted);
}

/* ---------- 15 面包屑 ---------- */
.breadcrumb{padding:20px 0 0;}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--muted);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--line-strong);}
.breadcrumb__link{
  color:var(--muted);
  text-decoration:none;
  transition:color .16s ease;
}
.breadcrumb__link:hover{color:var(--cyan);}

/* ---------- 16 图片容器 ---------- */
.media-frame{
  position:relative;
  border:var(--edge);
  border-radius:var(--radius);
  background:var(--ink-1);
  overflow:hidden;
  box-shadow:var(--shadow-hard);
}
.media-frame__media{
  display:block;
  width:100%;
  aspect-ratio:16 / 9;
  background:
    linear-gradient(125deg,rgba(228,0,43,.16),transparent 46%),
    linear-gradient(0deg,rgba(0,229,255,.10),transparent 60%),
    var(--ink-1);
  overflow:hidden;
}
.media-frame--wide .media-frame__media{aspect-ratio:21 / 9;}
.media-frame--tall .media-frame__media{aspect-ratio:3 / 4;}
.media-frame__img{width:100%;height:100%;object-fit:cover;}
.media-frame__caption{
  padding:10px 14px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--muted);
}

/* ---------- 17 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid currentColor;
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
}
.tag--red{color:var(--red);}
.tag--cyan{color:var(--cyan);}
.tag--violet{color:var(--violet);}
.tag--amber{color:var(--amber);}

/* ---------- 18 页脚 ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:96px;
  padding-top:64px;
  background:
    radial-gradient(80% 60% at 90% 0,rgba(36,26,77,.5),transparent 62%),
    linear-gradient(180deg,rgba(18,22,31,.92),var(--ink-0) 48%);
  border-top:2px solid var(--line);
}
.footer-grid{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px 48px;
  display:grid;
  grid-template-columns:1.15fr 1.5fr 1.15fr;
  gap:44px 32px;
}
.footer-brand__name{
  font-family:var(--font-head);
  font-weight:900;
  font-size:26px;
  letter-spacing:.05em;
}
.footer-brand__tag{
  margin-top:4px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--cyan);
}
.footer-brand__note{
  margin-top:14px;
  max-width:34em;
  color:var(--muted);
  font-size:14px;
  line-height:1.7;
}
.footer-badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.footer-badge{
  padding:5px 11px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:rgba(11,14,19,.7);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--muted);
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.footer-col__title{
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.12em;
  color:var(--muted);
}
.footer-col__title::before{
  content:"";
  display:inline-block;
  width:10px;
  height:2px;
  margin-right:8px;
  vertical-align:middle;
  background:var(--red);
  transform:skewX(-24deg);
}
.footer-links{display:grid;gap:9px;}
.footer-links__item{display:block;}
.footer-links__link{
  color:var(--text);
  font-size:14px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.footer-links__link:hover{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
}
.footer-contact__list{display:grid;gap:10px;}
.footer-contact__item{display:flex;flex-wrap:wrap;gap:8px;font-size:14px;}
.footer-contact__key{
  flex:0 0 68px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--muted);
  padding-top:2px;
}
.footer-contact__val{color:var(--text);word-break:break-word;}
.footer-contact__note{
  margin-top:14px;
  color:var(--muted);
  font-size:13px;
}
.footer-legal{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:18px 24px 22px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px;
}
.footer-legal__text,
.footer-legal__meta{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--muted);
}
.footer-return{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  padding:14px 24px;
  background:var(--red);
  border-top:2px solid #000;
}
.footer-return__label{
  margin-right:auto;
  padding-left:calc((100% - var(--container)) / 2 > 0px ? 0px : 0px);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:rgba(255,255,255,.82);
}
.footer-return__link{
  padding:5px 14px;
  border:1px solid rgba(255,255,255,.55);
  border-radius:999px;
  color:#fff;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:background-color .16s ease,color .16s ease;
}
.footer-return__link:hover{background:#fff;color:var(--red);}

/* ---------- 19 右下返回浮条 ---------- */
.return-dock{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:70;
  display:flex;
  align-items:center;
  gap:8px;
  padding:8px;
  background:rgba(11,14,19,.94);
  border:2px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-hard);
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity .25s ease,transform .25s ease,visibility .25s linear;
}
.return-dock[data-visible]{
  opacity:1;
  visibility:visible;
  transform:none;
}
.return-dock__link{
  padding:9px 14px;
  background:var(--ink-1);
  border:1px solid var(--line);
  border-radius:3px;
  color:var(--text);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.return-dock__link:first-child{
  background:var(--red);
  border-color:#000;
  color:#fff;
}
.return-dock__link:hover{border-color:var(--cyan);color:var(--cyan);}
.return-dock__link:first-child:hover{background:#FF1B45;border-color:#000;color:#fff;}

/* ---------- 20 滚动显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s ease,transform .5s ease;
}
[data-reveal].is-visible{
  opacity:1;
  transform:none;
}
.reveal-group > [data-reveal]:nth-child(2){transition-delay:.12s;}
.reveal-group > [data-reveal]:nth-child(3){transition-delay:.24s;}
.reveal-group > [data-reveal]:nth-child(4){transition-delay:.36s;}
.reveal-group > [data-reveal]:nth-child(5){transition-delay:.48s;}
.reveal-group > [data-reveal]:nth-child(6){transition-delay:.6s;}

/* ---------- 21 响应式 ---------- */
@media (max-width:1024px){
  .span-3,.span-4,.span-5,.span-6{grid-column:span 6;}
  .span-7,.span-8{grid-column:span 12;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .footer-brand{grid-column:1 / -1;}
}

@media (max-width:900px){
  body{font-size:15.5px;}
  .nav-toggle{display:inline-flex;}
  .nav{
    position:fixed;
    inset:0;
    z-index:2;
    display:block;
    overflow-y:auto;
    padding:118px 20px 132px;
    background:
      radial-gradient(120% 70% at 85% -5%,rgba(228,0,43,.18),transparent 55%),
      radial-gradient(90% 60% at 8% 8%,rgba(0,229,255,.12),transparent 60%),
      var(--ink-0);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .26s ease,transform .26s ease,visibility .26s linear;
  }
  .site-header[data-open] .nav{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  html.nav-open{overflow:hidden;}
  .nav__list{display:grid;gap:6px;}
  .nav__link{
    width:100%;
    padding:14px 16px;
    font-size:clamp(17px,4.6vw,22px);
    border:1px solid var(--line);
    background:rgba(18,22,31,.72);
  }
  .nav__index{font-size:12px;}
  .header-main__inner{
    justify-content:flex-end;
    padding:0 18px;
    min-height:60px;
  }
  .site-header[data-scrolled] .header-main__inner{min-height:56px;}
  .header-actions{margin-left:0;}
  .section{padding:56px 0;}
  .zone{padding:48px 0;}
  .site-footer{margin-top:72px;padding-top:48px;}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));}
  .return-dock{right:12px;bottom:12px;padding:6px;}
  .return-dock__link{padding:8px 11px;font-size:11px;}
}

@media (max-width:640px){
  .container{padding:0 18px;}
  .header-top__inner{padding:7px 18px;gap:10px;}
  .brand__tag{display:none;}
  .telemetry__item + .telemetry__item{display:none;}
  .telemetry__val{font-size:12px;}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 12;}
  .grid{gap:18px;}
  .footer-grid{grid-template-columns:1fr;padding:0 18px 36px;gap:32px;}
  .footer-cols{grid-template-columns:1fr;gap:22px;}
  .footer-legal{padding:16px 18px 20px;}
  .footer-return{padding:12px 18px;}
  .footer-return__label{width:100%;margin:0 0 4px;}
  .panel{padding:18px;box-shadow:var(--shadow-hard-sm);}
  .section-head{margin-bottom:22px;}
}

/* ---------- 22 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 !important;
    transform:none !important;
  }
  .reveal-group > [data-reveal]{transition-delay:0s !important;}
  .return-dock{transform:none;}
}