/* ============================================================
   /assets/site.css — 完美体育登录 共享外壳
   深空底 + 荧光青轨道 + 橙红交互点 / 极细边界与仪表盘材质
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:170px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,dl,dt,dd,figure,blockquote{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
summary{list-style:none;cursor:pointer}
summary::-webkit-details-marker{display:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. Tokens ---------- */
:root{
  --c-void:#050B1C;
  --c-panel:#0B1636;
  --c-panel-hi:#0E1B41;
  --c-line:#12224A;
  --c-cyan:#00E5D0;
  --c-cyan-soft:#7FF6E8;
  --c-flame:#FF5A2B;
  --c-amber:#FFB020;
  --c-ink:#EAF2FF;
  --c-mute:#93A4C4;
  --c-press:#0E7C74;

  --font-display:"Archivo Black","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-body:"Inter","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --gutter:clamp(16px,4vw,44px);
  --maxw:1320px;
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. Base / 中文排版 ---------- */
body{
  background:var(--c-void);
  color:var(--c-ink);
  font-family:var(--font-body);
  font-size:1rem;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.006em;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.06;letter-spacing:-.02em;text-wrap:balance}
h1{font-size:clamp(2rem,5.2vw,4rem)}
h2{font-size:clamp(1.5rem,3vw,2.5rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.5rem)}
h4{font-size:1.0625rem;letter-spacing:-.01em}
p,li,dd{text-wrap:pretty}
strong{font-weight:700;color:#fff}
::selection{background:var(--c-cyan);color:var(--c-void)}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px;border-radius:var(--radius)}

/* ---------- 4. 容器 / 网格 ---------- */
.shell{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}

.split{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(20px,3vw,48px);align-items:start}
.split__aside{padding-right:clamp(16px,2.4vw,36px);border-right:1px solid var(--c-line);min-width:0}
.split__main{min-width:0}

.section{padding:clamp(40px,6vw,88px) 0;border-top:1px solid var(--c-line)}
.section:first-of-type{border-top:0}
.section__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 22px;margin-bottom:clamp(20px,3vw,36px)}
.section__title{font-size:clamp(1.35rem,2.4vw,2rem)}
.section__intro{max-width:46ch;color:var(--c-mute);font-size:15px}

.grid{display:grid;gap:clamp(12px,1.6vw,20px)}
.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))}

.rule{height:1px;background:var(--c-line);border:0;margin:0}

.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--c-cyan)}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--c-cyan);opacity:.75}

.prose{max-width:46ch}
.prose--wide{max-width:72ch}
.prose p+p{margin-top:1em}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:11px 20px;
  border:1px solid var(--c-line);
  border-radius:var(--radius);
  background:transparent;color:var(--c-ink);
  font-family:var(--font-body);font-size:14px;font-weight:700;line-height:1;letter-spacing:.02em;
  white-space:nowrap;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),filter .18s var(--ease);
}
.btn--sm{padding:7px 13px;font-size:12px;letter-spacing:.04em}
.btn--primary{background:var(--c-flame);border-color:var(--c-flame);color:#0A0F1E;font-weight:800}
.btn--primary:hover,.btn--primary:focus-visible{filter:brightness(1.12)}
.btn--primary:active{filter:brightness(.85)}
.btn--accent{background:var(--c-flame);border-color:var(--c-flame);color:#0A0F1E;font-weight:800}
.btn--accent:hover,.btn--accent:focus-visible{filter:brightness(1.12)}
.btn--accent:active{filter:brightness(.85)}
.btn--outline{border-color:var(--c-cyan);color:var(--c-cyan-soft)}
.btn--outline:hover,.btn--outline:focus-visible{background:rgba(0,229,208,.12);color:#fff}
.btn--outline:active{background:var(--c-press);border-color:var(--c-press);color:#fff}
.btn--ghost{border-color:var(--c-line);color:var(--c-mute)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--c-cyan);color:var(--c-ink);background:rgba(0,229,208,.07)}
.btn--ghost:active{background:var(--c-press);border-color:var(--c-press);color:#fff}

/* ---------- 6. 标签 / 卡片 / 索引 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--c-cyan);border:1px solid var(--c-line);background:rgba(0,229,208,.06);
  padding:4px 9px;border-radius:100px;
}
.tag--flame{color:var(--c-flame);border-color:rgba(255,90,43,.35);background:rgba(255,90,43,.08)}
.tag--amber{color:var(--c-amber);border-color:rgba(255,176,32,.32);background:rgba(255,176,32,.07)}

.card{
  position:relative;
  background:var(--c-panel);border:1px solid var(--c-line);
  padding:clamp(16px,2vw,24px);
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.card:hover,.card:focus-within{border-color:var(--c-cyan);background:var(--c-panel-hi)}
.card__meta{font-family:var(--font-mono);font-size:12px;color:var(--c-mute);letter-spacing:.04em;margin-bottom:8px}
.card__title{font-size:1.0625rem;font-weight:800;letter-spacing:-.01em;margin-bottom:6px}
.card__body{font-size:14px;line-height:1.75;color:var(--c-mute)}

.index-list{border-top:1px solid var(--c-line)}
.index-list__item{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:baseline;
  padding:12px 4px;border-bottom:1px solid var(--c-line);
  transition:background-color .16s var(--ease),padding-left .16s var(--ease),border-color .16s var(--ease);
}
.index-list__item:hover,.index-list__item:focus-within{background:rgba(0,229,208,.05);border-color:var(--c-cyan);padding-left:10px}
.index-list__num{font-family:var(--font-mono);font-size:12px;color:var(--c-cyan);min-width:2.2em}
.index-list__title{font-weight:700;font-size:15px}
.index-list__meta{font-family:var(--font-mono);font-size:12px;color:var(--c-mute)}

/* ---------- 7. 轨道块 ---------- */
.rail{
  border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);
  background:linear-gradient(90deg,rgba(0,229,208,.07),rgba(5,11,28,0) 46%);
  padding:16px 0;
}
.rail__inner{display:flex;overflow-x:auto;scrollbar-width:thin}
.rail__node{
  position:relative;flex:1 0 auto;min-width:150px;
  display:flex;flex-direction:column;gap:6px;
  padding:10px 20px 10px 22px;border-left:1px solid var(--c-line);
}
.rail__node:first-child{border-left:0;padding-left:0}
.rail__node-dot{width:7px;height:7px;border-radius:50%;background:var(--c-cyan);box-shadow:0 0 0 4px rgba(0,229,208,.14)}
.rail__node--now .rail__node-dot{background:var(--c-flame);box-shadow:0 0 0 4px rgba(255,90,43,.16);animation:breathe 1.6s ease-in-out infinite}
.rail__node-label{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--c-mute)}
.rail__node-title{font-size:14px;font-weight:700;color:var(--c-ink)}

@keyframes breathe{0%,100%{opacity:1}50%{opacity:.42}}

/* ---------- 8. 图片容器 ---------- */
.media{margin:0}
.media__frame{
  position:relative;display:block;width:100%;aspect-ratio:16/9;overflow:hidden;
  border:1px solid var(--c-line);
  background:
    radial-gradient(85% 120% at 18% 0%,rgba(0,229,208,.18),transparent 58%),
    linear-gradient(160deg,var(--c-panel),var(--c-void));
}
.media__frame::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(var(--c-line) 1px,transparent 1px),linear-gradient(90deg,var(--c-line) 1px,transparent 1px);
  background-size:32px 32px;
}
.media__frame img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.media__caption{margin-top:8px;font-family:var(--font-mono);font-size:12px;color:var(--c-mute)}
.media--wide .media__frame{aspect-ratio:21/9}
.media--tall .media__frame{aspect-ratio:4/5}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb{padding:14px 0;font-family:var(--font-mono);font-size:12px;color:var(--c-mute)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:0}
.breadcrumb__item{display:inline-flex;align-items:center}
.breadcrumb__item+.breadcrumb__item::before{content:"/";margin:0 9px;color:var(--c-line)}
.breadcrumb__link{color:var(--c-mute);transition:color .16s var(--ease)}
.breadcrumb__link:hover,.breadcrumb__link:focus-visible{color:var(--c-cyan-soft)}
.breadcrumb__current{color:var(--c-ink)}

/* ---------- 10. 显现动效 ---------- */
html.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.js .reveal.is-visible{opacity:1;transform:none}

/* ============================================================
   头部
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:120;
  background:var(--c-void);
  border-bottom:1px solid var(--c-line);
}

/* 顶部进度 */
.scroll-progress{position:absolute;top:0;left:0;right:0;height:2px;z-index:140;pointer-events:none}
.scroll-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--c-cyan),var(--c-flame))}

/* 跳转链接 */
.skip-link{
  position:fixed;left:var(--gutter);top:-80px;z-index:200;
  background:var(--c-cyan);color:var(--c-void);
  font-weight:800;font-size:14px;padding:10px 18px;border-radius:var(--radius);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:10px}

/* 工具条 */
.util-bar{
  background:var(--c-void);border-bottom:1px solid var(--c-line);font-size:12px;
  max-height:34px;overflow:hidden;
  transition:max-height .26s var(--ease),opacity .18s var(--ease);
}
.util-bar__inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  height:33px;width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter);
}
.util-bar__status{
  display:inline-flex;align-items:center;gap:8px;min-width:0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;color:var(--c-mute);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.status-dot{
  flex:none;width:6px;height:6px;border-radius:50%;background:var(--c-cyan);
  animation:pulse 1.6s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(0,229,208,.5)}
  50%{opacity:.5;box-shadow:0 0 0 6px rgba(0,229,208,0)}
}
.util-bar__actions{display:flex;align-items:center;gap:10px;flex:none}

/* 搜索 details */
.util-search{position:relative}
.util-search__trigger{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--font-mono);font-size:12px;color:var(--c-mute);
  padding:4px 9px;border:1px solid transparent;border-radius:var(--radius);
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.util-search__trigger::before{content:"";width:9px;height:9px;border:1.5px solid currentColor;border-radius:50%;flex:none}
.util-search__trigger:hover,.util-search__trigger:focus-visible{color:var(--c-cyan-soft);border-color:var(--c-line)}
.util-search[open] .util-search__trigger{color:var(--c-cyan);border-color:var(--c-line);background:rgba(0,229,208,.07)}
.util-search__panel{
  position:fixed;top:38px;
  right:max(var(--gutter),calc((100vw - var(--maxw)) / 2 + var(--gutter)));
  min-width:230px;z-index:150;
  background:var(--c-panel);border:1px solid var(--c-line);
  box-shadow:0 20px 44px -16px rgba(0,0,0,.92);
  padding:12px;
}
.util-search__panel::before{
  content:"按栏目检索";display:block;margin-bottom:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--c-mute);
}
.util-search__link{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:7px 8px;font-size:14px;font-weight:600;color:var(--c-ink);
  border-radius:var(--radius);
  transition:background-color .16s var(--ease),color .16s var(--ease);
}
.util-search__link span{font-family:var(--font-mono);font-size:11px;color:var(--c-mute);font-weight:400}
.util-search__link:hover,.util-search__link:focus-visible{background:var(--c-void);color:var(--c-cyan-soft)}

/* 刊头 */
.masthead{
  position:relative;background:var(--c-panel);border-bottom:1px solid var(--c-line);
  max-height:130px;overflow:hidden;
  transition:max-height .3s var(--ease),opacity .2s var(--ease);
}
.masthead::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(120% 150% at 50% -50%,rgba(0,229,208,.16),transparent 62%);
}
.masthead__inner{
  position:relative;z-index:1;
  display:flex;align-items:center;justify-content:center;gap:clamp(14px,2.4vw,28px);
  max-width:var(--maxw);margin-inline:auto;padding:22px var(--gutter) 20px;
}
.brand{display:flex;flex-direction:column;align-items:center;gap:7px;text-align:center;min-width:0}
.brand__mark{
  font-family:var(--font-display);font-weight:900;line-height:1;
  font-size:clamp(23px,3.4vw,40px);letter-spacing:-.02em;color:var(--c-ink);
  transition:color .18s var(--ease);
}
.brand:hover .brand__mark,.brand:focus-visible .brand__mark{color:var(--c-cyan-soft)}
.brand__tagline{font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;color:var(--c-mute)}
.masthead__rule{width:1px;align-self:stretch;min-height:40px;background:var(--c-line);flex:none}
.masthead__count{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--c-mute);white-space:nowrap;flex:none}
.masthead__count-num{font-size:22px;font-weight:700;color:var(--c-cyan);margin-right:6px;vertical-align:-1px}

/* 栏目横条 */
.nav-bar{background:var(--c-void);border-bottom:1px solid var(--c-line)}
.nav-bar__inner{
  position:relative;display:flex;align-items:center;justify-content:center;
  min-height:56px;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter);
}
.nav{display:block}
.nav__list{display:flex;align-items:center;gap:2px}
.nav__link{
  position:relative;display:block;padding:9px 14px;border-radius:var(--radius);
  font-size:14px;font-weight:600;color:var(--c-mute);letter-spacing:.02em;
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.nav__link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:0;height:2px;
  background:var(--c-cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .2s var(--ease);
}
.nav__link:hover,.nav__link:focus-visible{color:var(--c-ink);background:rgba(0,229,208,.07)}
.nav__link:hover::after,.nav__link:focus-visible::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--c-ink);font-weight:800}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}

.nav-bar__switch{position:absolute;right:var(--gutter);top:50%;transform:translateY(-50%)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  position:absolute;left:var(--gutter);top:50%;transform:translateY(-50%);
  padding:8px 12px;border:1px solid var(--c-line);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--c-mute);
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--c-cyan);color:var(--c-ink)}
.nav-toggle__bars{
  width:16px;height:10px;flex:none;
  background:
    linear-gradient(var(--c-cyan) 0 0) top/100% 1.5px no-repeat,
    linear-gradient(var(--c-cyan) 0 0) center/100% 1.5px no-repeat,
    linear-gradient(var(--c-cyan) 0 0) bottom/100% 1.5px no-repeat;
}
.nav-toggle[aria-expanded="true"]{border-color:var(--c-cyan);color:var(--c-ink)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{
  background:
    linear-gradient(var(--c-flame) 0 0) top/100% 1.5px no-repeat,
    linear-gradient(var(--c-flame) 0 0) center/100% 1.5px no-repeat,
    linear-gradient(var(--c-flame) 0 0) bottom/100% 1.5px no-repeat;
}
.nav-toggle__label{white-space:nowrap}

/* 主行动带 */
.header-cta{background:var(--c-panel);border-bottom:1px solid var(--c-line);transition:padding .2s var(--ease)}
.header-cta__inner{
  display:flex;align-items:center;gap:clamp(14px,3vw,32px);
  max-width:var(--maxw);margin-inline:auto;padding:12px var(--gutter);
}
.header-cta__track{
  flex:1 1 auto;min-width:40px;height:1px;position:relative;
  background:linear-gradient(90deg,var(--c-line),var(--c-cyan) 58%,var(--c-flame));
  opacity:.7;
}
.header-cta__track::after{
  content:"";position:absolute;right:0;top:-3.5px;width:8px;height:8px;border-radius:50%;
  background:var(--c-flame);box-shadow:0 0 0 3px rgba(255,90,43,.18);
}
.header-cta__actions{display:flex;align-items:center;gap:10px;flex:none}

/* 收拢态 */
.site-header[data-condensed] .util-bar,
.site-header[data-condensed] .masthead{max-height:0;opacity:0}
.site-header[data-condensed] .header-cta__inner{padding-top:8px;padding-bottom:8px}
.site-header[data-condensed] .util-search__panel{display:none}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{background:var(--c-panel);border-top:1px solid var(--c-line);margin-top:clamp(40px,7vw,96px)}
.footer__grid{
  display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr 1fr;
  gap:clamp(22px,3vw,44px);
  max-width:var(--maxw);margin-inline:auto;padding:clamp(36px,5vw,64px) var(--gutter);
}
.footer__brand{min-width:0;padding-right:clamp(0px,2vw,28px);border-right:1px solid var(--c-line)}
.footer__mark{font-family:var(--font-display);font-weight:900;font-size:clamp(20px,2.2vw,26px);letter-spacing:-.02em;line-height:1.1;color:var(--c-ink)}
.footer__tagline{margin-top:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--c-mute)}

.contact-list{margin-top:20px;border-top:1px solid var(--c-line)}
.contact-list__row{display:grid;grid-template-columns:5.2em minmax(0,1fr);gap:10px;padding:9px 0;border-bottom:1px solid var(--c-line)}
.contact-list__key{font-family:var(--font-mono);font-size:12px;color:var(--c-mute);letter-spacing:.04em}
.contact-list__val{font-size:14px;color:var(--c-ink);word-break:break-word;font-variant-numeric:tabular-nums}
.footer__note{margin-top:14px;font-size:12px;line-height:1.7;color:var(--c-mute);max-width:40ch}

.footer__col{min-width:0}
.footer__col-title{
  font-family:var(--font-mono);font-size:12px;font-weight:500;
  letter-spacing:.16em;color:var(--c-cyan);margin-bottom:14px;
}
.footer__list{display:flex;flex-direction:column;gap:2px}
.footer__link{
  display:inline-block;padding:5px 0;font-size:14px;color:var(--c-mute);
  transition:color .16s var(--ease),transform .16s var(--ease);
}
.footer__link:hover,.footer__link:focus-visible{color:var(--c-cyan-soft);transform:translateX(4px)}

.footer__legal{border-top:1px solid var(--c-line);background:var(--c-void)}
.footer__legal-inner{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;
  max-width:var(--maxw);margin-inline:auto;padding:18px var(--gutter);
}
.footer__legal-text{font-family:var(--font-mono);font-size:12px;color:var(--c-mute);letter-spacing:.02em}
.footer__legal-note{font-family:var(--font-mono);font-size:12px;color:var(--c-mute);opacity:.8}
.to-top{
  margin-left:auto;
  padding:7px 14px;border:1px solid var(--c-line);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--c-mute);
  transition:border-color .16s var(--ease),color .16s var(--ease),background-color .16s var(--ease);
}
.to-top:hover,.to-top:focus-visible{border-color:var(--c-cyan);color:var(--c-cyan-soft);background:rgba(0,229,208,.08)}
.to-top:active{background:var(--c-press);border-color:var(--c-press);color:#fff}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1180px){
  .split{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
  .footer__grid{grid-template-columns:1.5fr 1fr 1fr;row-gap:32px}
  .footer__brand{grid-column:1 / -1;border-right:0;border-bottom:1px solid var(--c-line);padding-right:0;padding-bottom:24px}
}
@media (max-width:1000px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  html{scroll-padding-top:120px}
  .nav-toggle{display:inline-flex}
  .nav{
    display:none;position:absolute;left:0;right:0;top:100%;z-index:135;
    background:var(--c-panel);border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);
    box-shadow:0 28px 48px -22px rgba(0,0,0,.95);
    padding:8px var(--gutter) 16px;
  }
  .nav[data-open]{display:block}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{padding:14px 4px;font-size:16px;border-bottom:1px solid var(--c-line);border-radius:0}
  .nav__link::after{left:0;right:auto;width:26px;bottom:-1px}
  .nav-bar__switch{position:static;transform:none;margin-left:auto}
  .nav-bar__inner{justify-content:space-between}
  .header-cta__track{display:none}
}
@media (max-width:860px){
  .split{grid-template-columns:minmax(0,1fr);gap:30px}
  .split__aside{border-right:0;border-bottom:1px solid var(--c-line);padding-right:0;padding-bottom:26px}
}
@media (max-width:720px){
  .util-bar__sub{display:none}
  .util-bar__inner{gap:10px}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__legal-inner{gap:8px 16px}
  .to-top{margin-left:0}
  .header-cta__inner{flex-direction:column;align-items:stretch;gap:10px}
  .header-cta__actions{justify-content:space-between;width:100%}
  .header-cta__actions .btn{flex:1 1 auto}
}
@media (max-width:640px){
  .masthead__inner{flex-direction:column;gap:8px;padding:16px var(--gutter) 14px}
  .masthead__rule{display:none}
  .masthead__count{font-size:11px}
  .brand__tagline{letter-spacing:.16em}
  .util-search__panel{left:var(--gutter);right:var(--gutter);min-width:0}
}
@media (max-width:620px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer__grid{grid-template-columns:minmax(0,1fr)}
  .contact-list__row{grid-template-columns:minmax(0,1fr);gap:2px}
}
@media (max-width:380px){
  .nav-bar__switch{padding:6px 9px;font-size:11px}
}

/* 无障碍与动效降级 */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js .reveal{opacity:1;transform:none}
}