/* ==========================================================================
   HG13 赛场 · 共享样式表 /assets/site.css
   沥青黑底 + 计时器荧光绿 / 海报式分层 / 编号体系 / 赛道中央分割线
   ========================================================================== */

/* ---------- 变量 ---------- */
:root{
  --c-asphalt:#0A0C0B;
  --c-graphite:#141A18;
  --c-steel:#1F2725;
  --c-line:#2E3A36;
  --c-neon:#C8FF2E;
  --c-neon-deep:#7FA31F;
  --c-flag-red:#FF3B30;
  --c-warn-yellow:#FFC400;
  --c-paper:#E9ECE6;
  --c-white:#F3F6F2;
  --c-muted:#8C9793;

  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Noto Sans Mono CJK SC",monospace;

  --fs-display:clamp(48px,9vw,160px);
  --fs-h2:clamp(24px,3.2vw,40px);
  --fs-h3:clamp(20px,2.4vw,34px);
  --fs-label:11px;

  --shell:min(1320px,100% - clamp(24px,5vw,72px));
  --gap:clamp(14px,1.6vw,22px);
  --pad:clamp(16px,2vw,28px);
  --ease:cubic-bezier(.16,.84,.44,1);
  --header-h:70px;
  --z-header:60;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--c-asphalt);
  color:var(--c-white);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.55;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  background-image:
    linear-gradient(to right,rgba(46,58,54,.30) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(46,58,54,.20) 1px,transparent 1px);
  background-size:88px 88px,88px 88px;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
input{font:inherit}
table{border-collapse:collapse;width:100%}
#main-content{display:block;outline:none}
:focus-visible{outline:2px solid var(--c-neon);outline-offset:3px}
::selection{background:var(--c-neon);color:#0A0C0B}

/* ---------- 通用工具 ---------- */
.shell{width:var(--shell);margin-inline:auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.mono,.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.label{display:inline-block;font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.14em;text-transform:uppercase;color:var(--c-muted)}
.stack>*+*{margin-top:var(--gap)}
.cluster{display:flex;flex-wrap:wrap;gap:10px;align-items:center}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 16px;background:var(--c-neon);color:#0A0C0B;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;font-weight:700;
  transform:translateY(-180%);transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:var(--z-header);
  background:transparent;border-bottom:1px solid transparent;
  transition:background .28s var(--ease),border-color .28s var(--ease);
}
.site-header.is-condensed{
  background:rgba(20,26,24,.95);
  border-bottom-color:var(--c-line);
  backdrop-filter:blur(10px);
}
.site-header__inner{
  width:var(--shell);margin-inline:auto;
  display:flex;align-items:center;gap:clamp(12px,2.2vw,34px);
  min-height:var(--header-h);padding-block:10px;
}
.brand{display:flex;align-items:baseline;gap:10px;flex:0 0 auto}
.brand__mark{
  font-family:var(--font-display);font-weight:900;font-style:italic;
  font-size:clamp(22px,2.6vw,30px);line-height:1;letter-spacing:.02em;
  color:var(--c-white);transition:color .24s var(--ease);
}
.brand:hover .brand__mark{color:var(--c-neon)}
.brand__line{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--c-muted);white-space:nowrap;
}
.brand--footer{margin-bottom:12px}
.brand--footer .brand__mark{font-size:26px}

.header-rail{
  flex:1 1 auto;min-width:0;position:relative;
  display:flex;align-items:center;justify-content:center;gap:12px;
}
.header-rail::before{
  content:"";position:absolute;left:0;right:0;top:50%;height:1px;
  background:linear-gradient(90deg,transparent,var(--c-line) 10%,var(--c-line) 90%,transparent);
}
.rail-link{
  position:relative;z-index:1;background:var(--c-asphalt);
  padding:6px 12px;border:1px solid var(--c-line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--c-muted);
  transition:color .24s var(--ease),border-color .24s var(--ease);
}
.rail-link:hover{color:var(--c-neon);border-color:var(--c-neon-deep)}
.sync{
  position:relative;z-index:1;display:inline-flex;align-items:center;gap:8px;
  padding:6px 12px;background:var(--c-asphalt);border:1px solid var(--c-line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--c-muted);white-space:nowrap;
}
.sync__dot{
  width:7px;height:7px;border-radius:50%;background:var(--c-neon);
  animation:pulse 2.6s var(--ease) infinite;
}
.sync__text{color:currentColor}
.sync--live{color:var(--c-neon);border-color:rgba(200,255,46,.35)}
.sync--pending{color:var(--c-warn-yellow);border-color:rgba(255,196,0,.35)}
.sync--pending .sync__dot{background:var(--c-warn-yellow);animation-name:pulse-warn}
.sync--fix{color:var(--c-flag-red);border-color:rgba(255,59,48,.4)}
.sync--fix .sync__dot{background:var(--c-flag-red);animation:none}

@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(200,255,46,.55)}
  70%{box-shadow:0 0 0 8px rgba(200,255,46,0)}
  100%{box-shadow:0 0 0 0 rgba(200,255,46,0)}
}
@keyframes pulse-warn{
  0%{box-shadow:0 0 0 0 rgba(255,196,0,.55)}
  70%{box-shadow:0 0 0 8px rgba(255,196,0,0)}
  100%{box-shadow:0 0 0 0 rgba(255,196,0,0)}
}

/* 导航 */
.nav{flex:0 0 auto}
.nav__list{display:flex;align-items:center;gap:clamp(2px,1vw,14px)}
.nav__item{display:block}
.nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 10px;font-size:14px;line-height:1;
  color:var(--c-white);transition:color .2s var(--ease);
}
.nav__idx{font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;color:var(--c-muted);transition:color .2s var(--ease)}
.nav__link::after{
  content:"";position:absolute;left:10px;right:10px;bottom:3px;height:2px;
  background:var(--c-neon);transform:scaleX(0);transform-origin:left;
  transition:transform .28s var(--ease),background-color .2s var(--ease);
}
.nav__link:hover{color:var(--c-neon)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--c-neon)}
.nav__link[aria-current="page"] .nav__idx{color:var(--c-neon-deep)}
.nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--c-flag-red)}

/* 移动导航按钮 */
.nav-toggle{
  display:none;position:relative;flex:0 0 auto;
  width:46px;height:40px;border:1px solid var(--c-line);background:var(--c-graphite);
  cursor:pointer;transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--c-neon-deep);background:var(--c-steel)}
.nav-toggle__bars{position:absolute;inset:0;display:block}
.nav-toggle__bar{position:absolute;left:12px;right:12px;height:2px;background:var(--c-white);transition:transform .24s var(--ease),opacity .18s var(--ease),background-color .2s var(--ease)}
.nav-toggle__bar:nth-child(1){top:14px}
.nav-toggle__bar:nth-child(2){top:19px}
.nav-toggle__bar:nth-child(3){top:24px}
.nav-toggle[aria-expanded="true"]{border-color:var(--c-neon)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar{background:var(--c-neon)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* 滚动进度（计时器读数条） */
.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none}
.scroll-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--c-neon-deep),var(--c-neon))}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;margin-top:clamp(40px,6vw,84px);background:var(--c-graphite);border-top:1px solid var(--c-line)}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:-1px;height:3px;
  background:linear-gradient(90deg,var(--c-neon) 0 14%,transparent 14% 86%,var(--c-flag-red) 86% 100%);
  opacity:.85;
}
.footer__inner{
  width:var(--shell);margin-inline:auto;
  display:grid;grid-template-columns:minmax(190px,1.1fr) minmax(0,2fr) minmax(250px,1.5fr);
  gap:clamp(20px,3vw,48px);padding-block:clamp(28px,4vw,46px);
}
.footer__brand{display:flex;flex-direction:column;align-items:flex-start}
.footer__note{font-size:13px;line-height:1.6;color:var(--c-muted);max-width:34ch}
.footer__brand .tag{margin-top:14px}
.footer__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--gap)}
.footer__col{min-width:0}
.footer__title{
  margin:0 0 10px;padding-bottom:8px;border-bottom:1px solid var(--c-line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;font-weight:500;
  text-transform:uppercase;color:var(--c-muted);
}
.footer__list{display:flex;flex-direction:column;gap:2px}
.footer__link{
  display:inline-block;padding:3px 0;font-size:14px;color:var(--c-white);
  border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer__link:hover{color:var(--c-neon);border-bottom-color:var(--c-neon-deep)}
.footer__contact{display:flex;flex-direction:column}
.footer__meta{font-size:13px;line-height:1.7;color:var(--c-white);margin-bottom:2px}
.footer__meta .mono{color:var(--c-neon)}
.footer__contact .footer__note{margin-top:8px;max-width:36ch}
.footer__legal{
  width:var(--shell);margin-inline:auto;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 20px;align-items:center;
  padding-block:14px 20px;border-top:1px solid var(--c-line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--c-muted);
}
.footer__icp{color:var(--c-muted)}

/* ---------- 章节与标题 ---------- */
.section{padding-block:clamp(44px,6.5vw,100px);position:relative}
.section--tight{padding-block:clamp(26px,4vw,56px)}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:12px 20px;margin-bottom:clamp(18px,2.6vw,32px)}
.section__num{
  font-family:var(--font-mono);font-size:clamp(28px,3.6vw,52px);line-height:.85;
  color:var(--c-neon);
}
@supports (-webkit-text-stroke:1px #000){
  .section__num{color:transparent;-webkit-text-stroke:1px var(--c-neon-deep)}
}
.section__title{font-size:var(--fs-h3);font-weight:700;line-height:1.15;letter-spacing:-.01em}
.section__desc{font-size:14px;color:var(--c-muted);max-width:56ch;flex:1 1 260px}

/* ---------- 页头 / 正文 ---------- */
.page__head{
  padding-block:clamp(26px,4vw,56px) clamp(20px,3vw,36px);
  border-bottom:1px solid var(--c-line);
}
.page__title{
  font-family:var(--font-display);font-weight:900;font-style:italic;
  text-transform:uppercase;font-size:clamp(38px,6.4vw,96px);line-height:.95;letter-spacing:-.01em;
}
.page__lead{margin-top:14px;max-width:62ch;font-size:15px;color:var(--c-muted)}
.prose{max-width:74ch;font-size:15px;color:var(--c-white)}
.prose p+p{margin-top:12px}
.prose h2{margin-top:26px;font-size:var(--fs-h3);font-weight:700;line-height:1.2}
.prose ul{margin-top:12px;padding-left:18px;list-style:square}
.prose li+li{margin-top:6px}

/* ---------- 面包屑 ---------- */
.crumb{padding-block:14px;border-bottom:1px solid var(--c-line)}
.crumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--c-muted)}
.crumb__item{display:inline-flex;align-items:center;gap:8px}
.crumb__item+.crumb__item::before{content:"/";color:var(--c-line)}
.crumb__item[aria-current="page"]{color:var(--c-white)}
.crumb__link{color:var(--c-muted);transition:color .2s var(--ease)}
.crumb__link:hover{color:var(--c-neon)}

/* ---------- 栅格 ---------- */
.grid{display:grid;gap:var(--gap)}
.grid--cols{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}
.col-main{grid-column:1 / span 8}
.col-side{grid-column:9 / span 4}

/* 赛道式中央分割线 */
.rail-divider{position:relative}
.rail-divider::before{
  content:"";position:absolute;top:0;bottom:0;left:50%;width:1px;
  background:linear-gradient(180deg,transparent,var(--c-line) 8%,var(--c-line) 92%,transparent);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;border:1px solid var(--c-line);background:var(--c-graphite);
  color:var(--c-white);cursor:pointer;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,0 100%);
  transition:background-color .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease);
}
.btn:hover{border-color:var(--c-neon);color:var(--c-neon)}
.btn--neon{background:var(--c-neon);border-color:var(--c-neon);color:#0A0C0B;font-weight:700}
.btn--neon:hover{background:var(--c-white);border-color:var(--c-white);color:#0A0C0B}
.btn--ghost{background:transparent}
.btn--sm{padding:8px 14px;font-size:11px;letter-spacing:.1em}

/* ---------- 卡片 / 纸张 / 标签 ---------- */
.card{
  position:relative;background:var(--c-graphite);border:1px solid var(--c-line);
  padding:var(--pad);
  clip-path:polygon(0 0,calc(100% - 18px) 0,100% 18px,100% 100%,0 100%);
  transition:background-color .28s var(--ease),border-color .28s var(--ease);
}
.card:hover{background:var(--c-steel);border-color:var(--c-neon-deep)}
.card--accent{border-left:3px solid var(--c-neon)}
.card__title{font-size:19px;font-weight:700;line-height:1.25}
.card__meta{margin-top:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--c-muted)}
.card__body{margin-top:10px;font-size:14px;line-height:1.6;color:var(--c-muted)}
.card__body strong{color:var(--c-white)}

.plate{
  display:inline-block;padding:8px 13px;background:var(--c-paper);color:#0A0C0B;
  border:1px solid #0A0C0B;box-shadow:4px 4px 0 rgba(200,255,46,.85);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
}
.tag{
  display:inline-flex;align-items:center;gap:6px;padding:3px 9px;
  border:1px solid var(--c-line);background:var(--c-steel);color:var(--c-muted);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;line-height:1.6;
}
.tag--neon{background:var(--c-neon);border-color:var(--c-neon);color:#0A0C0B;font-weight:700}
.tag--red{background:rgba(255,59,48,.10);border-color:rgba(255,59,48,.5);color:var(--c-flag-red)}
.tag--warn{background:rgba(255,196,0,.10);border-color:rgba(255,196,0,.5);color:var(--c-warn-yellow)}
.tag--paper{background:var(--c-paper);border-color:var(--c-paper);color:#0A0C0B}

/* ---------- 数据表 ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--c-line);background:var(--c-graphite);-webkit-overflow-scrolling:touch}
.data-table{width:100%;min-width:520px;font-size:14px}
.data-table caption{caption-side:top;text-align:left;padding:12px 14px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--c-muted);border-bottom:1px solid var(--c-line)}
.data-table th{
  padding:10px 14px;text-align:left;font-family:var(--font-mono);
  font-size:11px;font-weight:500;letter-spacing:.1em;text-transform:uppercase;
  color:var(--c-muted);border-bottom:1px solid var(--c-line);white-space:nowrap;
}
.data-table td{padding:11px 14px;border-bottom:1px solid var(--c-steel);vertical-align:top;color:var(--c-white)}
.data-table tbody tr:nth-child(even){background:rgba(31,39,37,.45)}
.data-table tbody tr:hover{background:var(--c-steel)}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table .num{color:var(--c-white)}
.data-table .is-key{color:var(--c-neon);font-family:var(--font-mono);font-weight:700})

/* ---------- 指标块 ---------- */
.stat{border-left:2px solid var(--c-neon);padding:6px 0 6px 14px}
.stat__value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(26px,3vw,38px);font-weight:700;line-height:1;color:var(--c-neon);
}
.stat__label{margin-top:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--c-muted)}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  background:var(--c-graphite);border:1px solid var(--c-line);
  clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,0 100%);
}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(.88) contrast(1.06)}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(10,12,11,0) 42%,rgba(10,12,11,.74));
}
.media--plain::after{display:none}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media__ph{
  position:absolute;inset:0;display:grid;place-items:center;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--c-muted);
  background:repeating-linear-gradient(135deg,var(--c-graphite) 0 10px,var(--c-steel) 10px 20px);
}
.media__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:.08em;color:var(--c-white);
}

/* ---------- 横向数据带 ---------- */
.band{
  position:relative;overflow-x:auto;overflow-y:hidden;
  scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;
  scrollbar-width:none;border-block:1px solid var(--c-line);
}
.band::-webkit-scrollbar{display:none}
.band:focus-visible{outline:2px solid var(--c-neon);outline-offset:-2px}
.band__track{display:flex;gap:1px;background:var(--c-line);min-width:100%}
.band__item{
  flex:0 0 clamp(240px,26vw,340px);scroll-snap-align:start;
  background:var(--c-graphite);padding:var(--pad);
}

/* ---------- 折叠面板 ---------- */
.fold{border-bottom:1px solid var(--c-line)}
.fold__summary{
  display:flex;align-items:center;gap:12px;padding:15px 2px;cursor:pointer;
  font-size:15px;font-weight:500;list-style:none;transition:color .2s var(--ease);
}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary::after{content:"+";margin-left:auto;font-family:var(--font-mono);font-size:16px;color:var(--c-neon)}
.fold[open] .fold__summary{color:var(--c-neon)}
.fold[open] .fold__summary::after{content:"–"}
.fold__idx{font-family:var(--font-mono);font-size:11px;color:var(--c-muted)}
.fold__body{padding:0 2px 16px;font-size:14px;line-height:1.65;color:var(--c-muted);max-width:72ch}

/* ---------- 分级筛选（纯 CSS radio） ---------- */
.filter{display:inline-flex;flex-wrap:wrap;border:1px solid var(--c-line);background:var(--c-graphite);max-width:100%}
.filter__input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.filter__label{
  display:inline-flex;align-items:center;gap:8px;padding:10px 16px;
  border-right:1px solid var(--c-line);cursor:pointer;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--c-muted);transition:background-color .2s var(--ease),color .2s var(--ease);
}
.filter__label:last-of-type{border-right:0}
.filter__label:hover{color:var(--c-white);background:var(--c-steel)}
.filter__input:checked+.filter__label{background:var(--c-neon);color:#0A0C0B;font-weight:700}
.filter__input:focus-visible+.filter__label{outline:2px solid var(--c-neon);outline-offset:-2px}

/* ---------- 锚点目录 ---------- */
.toc{position:sticky;top:calc(var(--header-h) + 18px);border-left:1px solid var(--c-line);padding-left:14px}
.toc__list{display:flex;flex-direction:column;gap:2px}
.toc__link{
  display:flex;align-items:baseline;gap:10px;padding:5px 0;
  font-size:13px;color:var(--c-muted);transition:color .2s var(--ease);
}
.toc__link:hover{color:var(--c-white)}
.toc__link[aria-current="true"]{color:var(--c-neon)}
.toc__idx{font-family:var(--font-mono);font-size:11px;opacity:.75}

/* ---------- 显现动画 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .36s var(--ease),transform .36s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .nav__link{padding:9px 8px;font-size:13px}
  .brand__line{display:none}
}
@media (max-width:1024px){
  :root{--header-h:64px}
  .header-rail{justify-content:flex-end}
  .header-rail::before{display:none}
  .rail-link{display:none}
  .nav-toggle{display:block}
  .nav{
    position:absolute;top:calc(100% + 1px);left:0;right:0;display:none;
    background:var(--c-graphite);border-block:1px solid var(--c-line);
    box-shadow:0 26px 48px rgba(0,0,0,.55);
    max-height:calc(100vh - var(--header-h) - 40px);overflow-y:auto;
  }
  .nav[data-open="true"]{display:block}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{
    display:flex;justify-content:flex-start;padding:15px clamp(16px,5vw,28px);
    font-size:16px;border-bottom:1px solid var(--c-steel);
  }
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{background:var(--c-steel)}
  .nav__item:last-child .nav__link{border-bottom:0}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .col-main,.col-side,.col-3,.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12}
  .rail-divider::before{display:none}
  .footer__inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer__contact{grid-column:span 2}
  .toc{position:static;border-left:0;border-top:1px solid var(--c-line);padding-left:0;padding-top:12px}
}
@media (max-width:760px){
  body{font-size:15px;background-size:64px 64px,64px 64px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer__inner{grid-template-columns:minmax(0,1fr);gap:24px}
  .footer__contact{grid-column:auto}
  .footer__cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
  .footer__legal{flex-direction:column;align-items:flex-start}
  .band__item{flex-basis:80%}
}
@media (max-width:480px){
  .footer__cols{grid-template-columns:minmax(0,1fr)}
  .brand__line{display:none}
}

/* ---------- 降级动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .reveal{opacity:1;transform:none}
  .sync__dot{animation:none;box-shadow:none}
}