/* ==========================================================================
   半岛体育 · 共享站点样式 /assets/site.css
   深海蓝底 + 框架式导航 + 精密网格 + 荧光青绿高亮
   ========================================================================== */

:root{
  --deep:#0A1B2E;
  --midnight:#050A12;
  --pitch:#12314F;
  --line:#1E3A55;
  --mint:#2BE8A5;
  --mint-dim:#0E7A5A;
  --gold:#F2C24B;
  --red:#E84B4B;
  --paper:#E8EDF2;
  --paper-2:#C6D3E0;
  --muted:#93A6BA;
  --grad-clear:linear-gradient(135deg,#0A1B2E 0%,#12314F 55%,#0E7A5A 100%);
  --maxw:1440px;
  --gutter:24px;
  --header-h:64px;
  --ease:cubic-bezier(0.22,0.61,0.36,1);
  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-num:ui-monospace,SFMono-Regular,Menlo,Consolas,"DejaVu Sans Mono","Courier New",monospace;
}

@media (min-width:1024px){
  :root{ --header-h:78px; }
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html,body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,fieldset,legend{margin:0;padding:0}
ul,ol{list-style:none}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  background-color:var(--deep);
  background-image:
    linear-gradient(180deg,rgba(18,49,79,.55) 0%,rgba(10,27,46,0) 44%),
    repeating-linear-gradient(0deg,rgba(30,58,85,.30) 0 1px,transparent 1px 48px),
    repeating-linear-gradient(90deg,rgba(30,58,85,.22) 0 1px,transparent 1px 48px);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
[hidden]{display:none !important}
:focus-visible{outline:2px solid var(--mint);outline-offset:2px;border-radius:1px}
::selection{background:var(--mint);color:var(--midnight)}

/* ---------- 跳转链接 ---------- */
.bs-skip{
  position:fixed;
  top:-64px;left:12px;
  z-index:200;
  padding:10px 18px;
  background:var(--mint);
  color:var(--midnight);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  border:1px solid var(--mint);
  transition:top 160ms var(--ease);
}
.bs-skip:focus{ top:12px; }

/* ---------- 页头框架 ---------- */
.bs-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(5,10,18,.88);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  color:var(--paper);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.bs-header::before{
  content:"";
  position:absolute;
  left:0;top:0;bottom:0;
  width:3px;
  background:linear-gradient(180deg,var(--mint) 0%,var(--mint-dim) 34%,rgba(14,122,90,0) 78%);
  pointer-events:none;
}
.bs-header[data-scrolled]{
  background:rgba(5,10,18,.96);
  box-shadow:0 12px 28px -22px rgba(0,0,0,.9);
}
.bs-frame{
  position:relative;
  max-width:var(--maxw);
  margin:0 auto;
  border-left:1px solid var(--line);
  border-right:1px solid var(--line);
}
.bs-frame::before,.bs-frame::after{
  content:"";
  position:absolute;
  top:-1px;
  width:10px;height:10px;
  pointer-events:none;
}
.bs-frame::before{
  left:-1px;
  border-top:2px solid var(--mint);
  border-left:2px solid var(--mint);
}
.bs-frame::after{
  right:-1px;
  border-top:2px solid var(--mint);
  border-right:2px solid var(--mint);
}
.bs-header__inner{
  display:flex;
  align-items:center;
  gap:16px;
  height:var(--header-h);
  padding:0 16px;
}

/* ---------- 品牌 ---------- */
.bs-brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--paper);
  min-width:0;
}
.bs-brand__mark{
  flex:0 0 auto;
  width:14px;height:26px;
  background:linear-gradient(160deg,var(--mint) 0%,var(--mint-dim) 100%);
  clip-path:polygon(0 0,100% 18%,100% 100%,0 82%);
  transition:transform 200ms var(--ease);
}
.bs-brand:hover .bs-brand__mark{ transform:skewX(-8deg); }
.bs-brand__text{
  display:flex;
  flex-direction:column;
  gap:2px;
  line-height:1.1;
  min-width:0;
}
.bs-brand__name{
  display:inline-block;
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  letter-spacing:.02em;
  transform:skewX(-4deg);
  transform-origin:left center;
}
.bs-brand__tagline{
  font-size:11px;
  letter-spacing:.06em;
  color:var(--muted);
  white-space:nowrap;
}
.bs-brand--footer .bs-brand__name{ font-size:22px; }
.bs-brand--footer .bs-brand__tagline{ letter-spacing:.08em; }

/* ---------- 移动导航按钮 ---------- */
.bs-nav-toggle{
  display:none;
  margin-left:auto;
  align-items:center;
  gap:10px;
  padding:9px 12px;
  border:1px solid var(--line);
  color:var(--paper);
  font-size:13px;
  letter-spacing:.08em;
  transition:border-color 160ms var(--ease),color 160ms var(--ease),background-color 160ms var(--ease);
}
.bs-nav-toggle:hover{ border-color:var(--mint); color:var(--mint); }
.bs-nav-toggle__bars{
  position:relative;
  display:block;
  width:20px;height:12px;
}
.bs-nav-toggle__bars::before,
.bs-nav-toggle__bars::after{
  content:"";
  position:absolute;left:0;
  width:100%;height:2px;
  background:currentColor;
  transition:transform 200ms var(--ease);
}
.bs-nav-toggle__bars::before{ top:0; }
.bs-nav-toggle__bars::after{ bottom:0; }
.bs-header[data-open] .bs-nav-toggle{ border-color:var(--mint); color:var(--mint); }
.bs-header[data-open] .bs-nav-toggle__bars::before{ transform:translateY(5px) rotate(45deg); }
.bs-header[data-open] .bs-nav-toggle__bars::after{ transform:translateY(-5px) rotate(-45deg); }

/* ---------- 主导航 ---------- */
.bs-nav{
  display:flex;
  align-items:center;
  gap:8px;
  margin-left:auto;
}
.bs-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
}
.bs-nav__item{ display:block; }
.bs-nav__link{
  position:relative;
  display:block;
  padding:9px 12px;
  font-size:15px;
  letter-spacing:.02em;
  color:var(--paper);
  border:1px solid transparent;
  transition:color 160ms var(--ease),background-color 160ms var(--ease),border-color 160ms var(--ease);
}
.bs-nav__link::after{
  content:"";
  position:absolute;
  left:8px;right:8px;bottom:2px;
  height:2px;
  background:var(--mint);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform 200ms var(--ease);
}
.bs-nav__link:hover{
  color:var(--mint);
  background:rgba(43,232,165,.07);
}
.bs-nav__link:hover::after{ transform:scaleX(1); }
.bs-nav__link[aria-current="page"]{
  color:var(--mint);
  border-color:var(--mint-dim);
  background:rgba(43,232,165,.09);
}
.bs-nav__link[aria-current="page"]::after{ transform:scaleX(1); }
.bs-nav__actions{
  display:flex;
  align-items:center;
  gap:8px;
  margin-left:10px;
  padding-left:14px;
  border-left:1px solid var(--line);
}

/* ---------- 按钮 ---------- */
.bs-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.2;
  border:1px solid var(--line);
  background:transparent;
  color:var(--paper);
  transition:background-color 160ms var(--ease),color 160ms var(--ease),border-color 160ms var(--ease),transform 160ms var(--ease);
}
.bs-btn:hover{ border-color:var(--mint); color:var(--mint); }
.bs-btn:active{ transform:translateY(1px); }
.bs-btn--solid{
  background:var(--mint);
  border-color:var(--mint);
  color:var(--midnight);
  font-weight:800;
}
.bs-btn--solid:hover{
  background:#5cf3bd;
  border-color:#5cf3bd;
  color:var(--midnight);
}
.bs-btn--ghost{ border-color:rgba(232,237,242,.28); }
.bs-btn--ghost:hover{ border-color:var(--mint); }
.bs-btn--sm{ padding:6px 12px; font-size:13px; letter-spacing:.06em; }

/* ---------- 滚动进度 ---------- */
.bs-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:rgba(30,58,85,.65);
  overflow:hidden;
  pointer-events:none;
}
.bs-progress__bar{
  display:block;
  width:100%;height:100%;
  background:linear-gradient(90deg,var(--mint-dim) 0%,var(--mint) 70%,var(--gold) 100%);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform 120ms linear;
}

/* ---------- 页脚 ---------- */
.bs-footer{
  position:relative;
  overflow:hidden;
  margin-top:80px;
  background:var(--midnight);
  border-top:1px solid var(--line);
  color:var(--paper);
}
.bs-footer__wedge{
  position:absolute;
  top:0;left:0;right:0;
  height:140px;
  background:linear-gradient(150deg,rgba(18,49,79,.9) 0%,rgba(14,122,90,.22) 44%,rgba(5,10,18,0) 72%);
  clip-path:polygon(0 0,100% 0,100% 22%,0 100%);
  pointer-events:none;
}
.bs-footer__inner{
  position:relative;
  z-index:1;
  padding:64px 0 24px;
}
.bs-footer__grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:32px;
  padding-bottom:40px;
  border-bottom:1px solid var(--line);
}
.bs-footer__brand{ min-width:0; }
.bs-footer__blurb{
  margin-top:18px;
  max-width:34ch;
  font-size:15px;
  line-height:1.7;
  color:var(--paper-2);
}
.bs-footer__contact{
  display:grid;
  gap:8px;
  margin-top:20px;
}
.bs-footer__contact-row{
  display:flex;
  gap:10px;
  font-size:14px;
  line-height:1.6;
  color:var(--paper-2);
}
.bs-footer__contact-key{
  flex:0 0 44px;
  font-size:13px;
  letter-spacing:.06em;
  color:var(--muted);
}
.bs-footer__note{
  margin-top:16px;
  max-width:44ch;
  padding-left:10px;
  border-left:2px solid var(--line);
  font-size:13px;
  line-height:1.7;
  color:var(--muted);
}
.bs-footer__col{ min-width:0; }
.bs-footer__col-title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  font-size:13px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--muted);
}
.bs-footer__col-title::before{
  content:"";
  width:14px;height:2px;
  background:var(--mint);
  flex:0 0 auto;
}
.bs-footer__list{ display:grid; gap:9px; }
.bs-footer__link{
  display:inline-block;
  font-size:15px;
  color:var(--paper-2);
  border-bottom:1px solid transparent;
  transition:color 160ms var(--ease),border-color 160ms var(--ease),transform 160ms var(--ease);
}
.bs-footer__link:hover{
  color:var(--mint);
  border-color:var(--mint-dim);
  transform:translateX(3px);
}
.bs-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:20px 0 8px;
  font-size:13px;
  color:var(--muted);
}
.bs-footer__legal{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.bs-footer__closing{ letter-spacing:.02em; }

/* ---------- 布局容器 ---------- */
.bs-shell{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
}
.bs-section{ padding:72px 0; }
.bs-section--tight{ padding:40px 0; }
.bs-section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  padding-bottom:16px;
  margin-bottom:32px;
  border-bottom:1px solid var(--line);
}
.bs-grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gutter);
}
.bs-col-3{ grid-column:span 3; }
.bs-col-4{ grid-column:span 4; }
.bs-col-5{ grid-column:span 5; }
.bs-col-6{ grid-column:span 6; }
.bs-col-7{ grid-column:span 7; }
.bs-col-8{ grid-column:span 8; }
.bs-col-9{ grid-column:span 9; }
.bs-col-12{ grid-column:span 12; }
.bs-divider{
  position:relative;
  height:1px;
  margin:32px 0;
  border:0;
  background:var(--line);
}
.bs-divider::after{
  content:"";
  position:absolute;
  left:0;top:-1px;
  width:96px;height:3px;
  background:linear-gradient(90deg,var(--mint) 0%,rgba(43,232,165,0) 100%);
}

/* ---------- 排版 ---------- */
.bs-title{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.06;
  letter-spacing:-.02em;
  font-stretch:condensed;
  color:var(--paper);
}
.bs-title--xl{ font-size:clamp(34px,7vw,56px); }
.bs-title--lg{ font-size:clamp(28px,4.6vw,40px); }
.bs-title--md{ font-size:clamp(22px,3vw,28px); }
.bs-title--sm{ font-size:20px; }
.bs-title--slant{
  transform:skewX(-5deg);
  transform-origin:left bottom;
}
.bs-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--mint);
}
.bs-eyebrow::before{
  content:"";
  display:block;
  width:18px;height:2px;
  background:var(--mint);
}
.bs-lede{
  max-width:64ch;
  font-size:17px;
  line-height:1.78;
  color:var(--paper-2);
}
.bs-note{
  padding-left:12px;
  border-left:2px solid var(--line);
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}

/* ---------- 面包屑 ---------- */
.bs-breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--muted);
}
.bs-breadcrumb__item{ display:inline-flex; align-items:center; gap:8px; }
.bs-breadcrumb__item a{ color:var(--muted); transition:color 160ms var(--ease); }
.bs-breadcrumb__item a:hover{ color:var(--mint); }
.bs-breadcrumb__sep{ color:var(--line); }
.bs-breadcrumb__current{ color:var(--paper); }

/* ---------- 卡片 ---------- */
.bs-card{
  position:relative;
  padding:20px;
  border:1px solid var(--line);
  background:linear-gradient(180deg,rgba(18,49,79,.6) 0%,rgba(5,10,18,.68) 100%);
  transition:border-color 200ms var(--ease),transform 200ms var(--ease);
}
.bs-card::before{
  content:"";
  position:absolute;
  left:0;top:0;
  width:36px;height:2px;
  background:var(--mint);
}
.bs-card:hover{ border-color:var(--mint-dim); }
.bs-card--offset{ transform:translateY(24px); }
.bs-card--offset-lg{ transform:translateY(48px); }
.bs-card__head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  margin-bottom:12px;
}
.bs-card__title{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:800;
  letter-spacing:-.01em;
  line-height:1.25;
}
.bs-card__meta{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:13px;
  color:var(--muted);
  white-space:nowrap;
}
.bs-card__body{
  font-size:15px;
  line-height:1.72;
  color:var(--paper-2);
}

/* ---------- 标签 ---------- */
.bs-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 8px;
  border:1px solid var(--line);
  background:rgba(18,49,79,.6);
  color:var(--muted);
  font-size:13px;
  letter-spacing:.08em;
  text-transform:uppercase;
  line-height:1.5;
}
.bs-tag__dot{
  display:inline-block;
  width:6px;height:6px;
  background:currentColor;
}
.bs-tag--mint{
  color:var(--mint);
  border-color:var(--mint-dim);
  background:rgba(43,232,165,.1);
}
.bs-tag--gold{
  color:var(--gold);
  border-color:rgba(242,194,75,.5);
  background:rgba(242,194,75,.08);
}
.bs-tag--red{
  color:var(--red);
  border-color:rgba(232,75,75,.5);
  background:rgba(232,75,75,.08);
}

/* ---------- 数字与指标 ---------- */
.bs-num{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
}
.bs-metric{
  padding-left:12px;
  border-left:2px solid var(--mint);
}
.bs-metric__value{
  display:block;
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:clamp(28px,4vw,40px);
  font-weight:700;
  line-height:1;
  color:var(--paper);
}
.bs-metric__label{
  margin-top:8px;
  font-size:13px;
  letter-spacing:.08em;
  color:var(--muted);
}
.bs-metric--gold{ border-color:var(--gold); }
.bs-metric--gold .bs-metric__value{ color:var(--gold); }
.bs-metric--red{ border-color:var(--red); }
.bs-metric--red .bs-metric__value{ color:var(--red); }

/* ---------- 索引列表 ---------- */
.bs-index{
  display:grid;
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.bs-index__item{
  display:grid;
  grid-template-columns:64px minmax(0,1fr) auto;
  align-items:center;
  gap:16px;
  padding:14px 16px;
  background:var(--deep);
  transition:background-color 180ms var(--ease);
}
.bs-index__item:hover{ background:var(--pitch); }
.bs-index__no{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:14px;
  color:var(--mint);
}
.bs-index__label{ font-weight:600; }
.bs-index__meta{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:13px;
  color:var(--muted);
  text-align:right;
  white-space:nowrap;
}

/* ---------- 键值档案 ---------- */
.bs-kv{ border:1px solid var(--line); }
.bs-kv__row{
  display:grid;
  grid-template-columns:180px minmax(0,1fr);
  gap:16px;
  padding:12px 16px;
  border-top:1px solid var(--line);
}
.bs-kv__row:first-child{ border-top:0; }
.bs-kv__key{
  font-size:14px;
  color:var(--muted);
}
.bs-kv__val{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:15px;
  color:var(--paper);
}

/* ---------- 正文 ---------- */
.bs-prose{
  max-width:72ch;
  font-size:17px;
  line-height:1.78;
  color:var(--paper-2);
}
.bs-prose p + p{ margin-top:1.2em; }
.bs-prose h2,
.bs-prose h3{
  margin-top:1.6em;
  margin-bottom:.6em;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.25;
  color:var(--paper);
}
.bs-prose h2{ font-size:28px; }
.bs-prose h3{ font-size:20px; }
.bs-prose a{
  color:var(--mint);
  border-bottom:1px solid var(--mint-dim);
  transition:border-color 160ms var(--ease);
}
.bs-prose a:hover{ border-color:var(--mint); }
.bs-prose ul,
.bs-prose ol{ margin:1.2em 0; display:grid; gap:.5em; }
.bs-prose li{ padding-left:20px; position:relative; }
.bs-prose li::before{
  content:"";
  position:absolute;
  left:0;top:.72em;
  width:8px;height:2px;
  background:var(--mint);
}
.bs-prose strong{ color:var(--paper); }

/* ---------- 图片容器（供页面阶段放置图片） ---------- */
.bs-media{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(160deg,#0A1B2E 0%,#12314F 60%,#0E7A5A 100%);
  aspect-ratio:16 / 9;
}
.bs-media--wide{ aspect-ratio:21 / 9; }
.bs-media--tall{ aspect-ratio:4 / 5; }
.bs-media--square{ aspect-ratio:1 / 1; }
.bs-media__img{
  width:100%;height:100%;
  object-fit:cover;
}
.bs-media__grid{
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.4;
  background-image:
    repeating-linear-gradient(0deg,rgba(232,237,242,.08) 0 1px,transparent 1px 26px),
    repeating-linear-gradient(90deg,rgba(232,237,242,.06) 0 1px,transparent 1px 26px);
}
.bs-media__caption{
  position:absolute;
  left:0;bottom:0;right:0;
  padding:8px 12px;
  font-size:13px;
  color:var(--paper);
  background:rgba(5,10,18,.74);
  border-top:1px solid var(--line);
}

/* ---------- 标签页 ---------- */
.bs-tabs{ margin-top:8px; }
.bs-tablist{
  display:flex;
  flex-wrap:wrap;
  gap:1px;
  padding:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.bs-tab{
  position:relative;
  padding:10px 16px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.02em;
  color:var(--muted);
  background:var(--deep);
  border-radius:2px 2px 0 0;
  transition:color 160ms var(--ease),background-color 160ms var(--ease);
}
.bs-tab:hover{ color:var(--paper); background:var(--pitch); }
.bs-tab[aria-selected="true"]{
  color:var(--midnight);
  background:var(--mint);
}
.bs-tabpanel{
  padding:22px 0 0;
  border-top:1px solid var(--line);
}

/* ---------- 筛选 ---------- */
.bs-filter{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.bs-filter__btn{
  display:inline-flex;
  align-items:center;
  padding:6px 12px;
  border:1px solid var(--line);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--muted);
  transition:color 160ms var(--ease),background-color 160ms var(--ease),border-color 160ms var(--ease);
}
.bs-filter__btn:hover{ color:var(--paper); border-color:var(--mint-dim); }
.bs-filter__btn[aria-pressed="true"]{
  color:var(--midnight);
  background:var(--mint);
  border-color:var(--mint);
}
.bs-filter__count{
  margin-left:6px;
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:12px;
  opacity:.7;
}

/* ---------- 显现与回顶 ---------- */
.bs-reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity 260ms var(--ease),transform 260ms var(--ease);
}
.bs-reveal.is-visible{
  opacity:1;
  transform:none;
}
.bs-backtop{
  position:fixed;
  right:20px;bottom:20px;
  z-index:70;
  display:grid;
  place-items:center;
  width:44px;height:44px;
  border:1px solid var(--line);
  background:rgba(5,10,18,.88);
  color:var(--mint);
  font-family:var(--font-num);
  font-size:16px;
  opacity:0;
  visibility:hidden;
  transition:opacity 200ms var(--ease),visibility 200ms var(--ease),border-color 200ms var(--ease);
}
.bs-backtop[data-visible]{
  opacity:1;
  visibility:visible;
}
.bs-backtop:hover{ border-color:var(--mint); }

/* ---------- 响应式 ---------- */
@media (max-width:1023px){
  .bs-header__inner{ padding:0 14px; gap:12px; }
  .bs-nav-toggle{ display:inline-flex; }
  .bs-nav{
    position:fixed;
    left:0;right:0;
    top:var(--header-h);
    bottom:0;
    z-index:79;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin:0;
    padding:20px 16px 48px;
    background:var(--midnight);
    border-top:1px solid var(--line);
    overflow-y:auto;
  }
  .bs-header[data-open] .bs-nav{
    display:flex;
    animation:bs-nav-in 200ms var(--ease);
  }
  .bs-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
  }
  .bs-nav__item{ background:var(--deep); }
  .bs-nav__link{
    padding:14px 16px;
    font-size:16px;
    border-color:transparent;
  }
  .bs-nav__link::after{
    left:0;right:auto;top:0;bottom:0;
    width:3px;height:auto;
    transform:scaleY(0);
    transform-origin:center top;
  }
  .bs-nav__link:hover::after,
  .bs-nav__link[aria-current="page"]::after{ transform:scaleY(1); }
  .bs-nav__link[aria-current="page"]{
    border-color:transparent;
    box-shadow:inset 0 0 0 1px var(--mint-dim);
  }
  .bs-nav__actions{
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    margin:20px 0 0;
    padding:20px 0 0;
    border-left:0;
    border-top:1px solid var(--line);
  }
  .bs-nav__actions .bs-btn{ width:100%; }
  .bs-col-3,.bs-col-4,.bs-col-5{ grid-column:span 6; }
  .bs-col-7,.bs-col-8,.bs-col-9{ grid-column:span 12; }
  .bs-section{ padding:56px 0; }
  .bs-card--offset,
  .bs-card--offset-lg{ transform:none; }
  .bs-footer__grid{ grid-template-columns:1fr 1fr; }
  .bs-footer__brand{ grid-column:1 / -1; }
  .bs-kv__row{ grid-template-columns:140px minmax(0,1fr); }
}

@keyframes bs-nav-in{
  from{ opacity:0; transform:translateY(-8px); }
  to{ opacity:1; transform:translateY(0); }
}

@media (max-width:639px){
  :root{ --gutter:16px; }
  .bs-grid > *{ grid-column:span 12; }
  .bs-section{ padding:44px 0; }
  .bs-section__head{ margin-bottom:24px; }
  .bs-index__item{
    grid-template-columns:52px minmax(0,1fr);
    gap:12px;
  }
  .bs-index__meta{ grid-column:2; text-align:left; }
  .bs-kv__row{ grid-template-columns:1fr; gap:6px; }
  .bs-footer__grid{ grid-template-columns:1fr; }
  .bs-footer__inner{ padding:48px 0 20px; }
  .bs-footer__bottom{ flex-direction:column; align-items:flex-start; }
  .bs-backtop{ right:14px; bottom:14px; }
}

@media (max-width:479px){
  .bs-brand__tagline{ display:none; }
  .bs-nav-toggle__label{ display:none; }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .bs-reveal{ opacity:1; transform:none; }
  .bs-header[data-open] .bs-nav{ animation:none; }
}