/* ============================================================
   百博体育 · 共享外壳样式 /assets/site.css
   夜场战术板 + 体育报纸天头
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --bb-red:#E02B3C;
  --bb-red-dark:#A3142A;
  --bb-blue:#1FA8FF;
  --bb-blue-light:#7FD0FF;
  --bb-gold:#C9A227;
  --bb-gold-light:#EBD08A;
  --bb-ink:#0E1116;
  --bb-board:#1C2230;
  --bb-paper:#F5F2EC;
  --bb-text:#2B2F36;
  --bb-green:#17C08A;
  --bb-line-dark:rgba(43,47,54,.18);
  --bb-line-light:rgba(245,242,236,.16);
  --bb-font:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --bb-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --bb-fs-56:clamp(2rem,4.6vw,3.5rem);
  --bb-fs-40:clamp(1.6rem,3.2vw,2.5rem);
  --bb-fs-32:clamp(1.35rem,2.4vw,2rem);
  --bb-fs-24:clamp(1.15rem,1.8vw,1.5rem);
  --bb-fs-18:1.125rem;
  --bb-fs-14:.875rem;
  --bb-fs-12:.75rem;
  --bb-wrap:1320px;
  --bb-gap:clamp(16px,2.4vw,28px);
  --bb-pad:clamp(16px,3vw,32px);
}

/* ---------- 2. Reset 与基础排版 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:168px;
}
body{
  margin:0;
  font-family:var(--bb-font);
  font-size:1rem;
  line-height:1.75;
  color:var(--bb-text);
  background-color:var(--bb-paper);
  background-image:repeating-linear-gradient(0deg,rgba(43,47,54,.022) 0 1px,transparent 1px 5px);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-weight:900;line-height:1.16;letter-spacing:-.01em;margin:0 0 .55em}
h1{font-size:var(--bb-fs-56)}
h2{font-size:var(--bb-fs-40)}
h3{font-size:var(--bb-fs-24)}
h4{font-size:var(--bb-fs-18);font-weight:800}
p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.05em;padding-left:1.35em}
a{color:var(--bb-blue);text-underline-offset:3px}
a:hover{color:var(--bb-red)}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--bb-blue);outline-offset:2px}
::selection{background:var(--bb-red);color:#fff}

/* ---------- 3. 跳转链接 ---------- */
.bb-skip{
  position:fixed;
  left:16px;
  top:-80px;
  z-index:200;
  padding:10px 16px;
  background:var(--bb-red);
  color:#fff;
  font-family:var(--bb-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-decoration:none;
  border:1px solid #fff;
  transition:top .22s ease;
}
.bb-skip:focus{top:12px;color:#fff}

/* ---------- 4. 页头框架 ---------- */
.bb-frame{
  position:sticky;
  top:0;
  z-index:120;
  background:var(--bb-ink);
  color:var(--bb-paper);
  border-bottom:2px solid var(--bb-red);
  transition:box-shadow .24s ease;
}
.bb-frame::before{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-6px;
  height:4px;
  background:repeating-linear-gradient(90deg,var(--bb-gold) 0 10px,transparent 10px 26px);
  opacity:.55;
  pointer-events:none;
}
.bb-frame[data-scrolled="true"]{box-shadow:0 14px 32px rgba(0,0,0,.45)}

.bb-index{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto auto;
  align-items:center;
  gap:clamp(12px,2vw,28px);
  max-width:var(--bb-wrap);
  margin:0 auto;
  padding:12px var(--bb-pad);
}
.bb-index__actions{display:flex;gap:10px;flex:none}

/* 品牌 */
.bb-brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:inherit;
  text-decoration:none;
  font-weight:900;
}
.bb-brand:hover{color:#fff}
.bb-brand__mark{
  position:relative;
  flex:none;
  width:26px;
  height:26px;
  background:var(--bb-red);
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.bb-brand__mark::after{
  content:"";
  position:absolute;
  left:6px;
  top:11px;
  width:14px;
  height:2px;
  background:var(--bb-paper);
}
.bb-brand__name{font-size:18px;letter-spacing:.02em;white-space:nowrap}
.bb-brand__sub{
  font-family:var(--bb-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--bb-blue-light);
  white-space:nowrap;
}
.bb-brand--footer{color:var(--bb-paper)}
.bb-brand--footer .bb-brand__mark{width:32px;height:32px}
.bb-brand--footer .bb-brand__name{font-size:22px}

/* 滚动快讯 */
.bb-ticker{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
  padding:0 14px;
  border-left:1px solid var(--bb-line-light);
  border-right:1px solid var(--bb-line-light);
  overflow:hidden;
}
.bb-ticker__tag{
  flex:none;
  padding:3px 8px;
  background:var(--bb-gold);
  color:var(--bb-ink);
  font-family:var(--bb-mono);
  font-size:11px;
  letter-spacing:.12em;
  font-weight:700;
}
.bb-ticker__track{
  display:flex;
  width:max-content;
  white-space:nowrap;
  animation:bb-marquee 38s linear infinite;
}
.bb-ticker__item{
  padding-right:38px;
  font-size:14px;
  color:rgba(245,242,236,.8);
}
.bb-ticker__item::before{
  content:"◆";
  margin-right:8px;
  color:var(--bb-blue);
  font-size:9px;
  vertical-align:2px;
}
@keyframes bb-marquee{
  from{transform:translateX(0)}
  to{transform:translateX(-50%)}
}

/* 导航格栅 */
.bb-nav{
  background:var(--bb-board);
  border-top:1px solid var(--bb-line-light);
}
.bb-nav__list{
  display:grid;
  grid-template-columns:repeat(6,minmax(0,1fr));
  max-width:var(--bb-wrap);
  margin:0 auto;
  padding:0;
  list-style:none;
}
.bb-nav__item{border-left:1px solid var(--bb-line-light)}
.bb-nav__item:first-child{border-left:3px solid var(--bb-red)}
.bb-nav__item:last-child{border-right:1px solid var(--bb-line-light)}
.bb-nav__link{
  display:flex;
  align-items:baseline;
  gap:8px;
  padding:14px 16px;
  color:var(--bb-paper);
  font-size:15px;
  font-weight:700;
  text-decoration:none;
  transition:background-color .22s ease,color .22s ease;
}
.bb-nav__link:hover{background:rgba(224,43,60,.18);color:#fff}
.bb-nav__num{
  font-family:var(--bb-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--bb-blue);
  font-weight:400;
}
.bb-nav__link[aria-current="page"]{
  background:rgba(224,43,60,.26);
  color:#fff;
  box-shadow:inset 0 -3px 0 var(--bb-red);
}
.bb-nav__link[aria-current="page"] .bb-nav__num{color:var(--bb-gold-light)}

/* 移动目录按钮 */
.bb-nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:9px 12px;
  background:transparent;
  border:1px solid var(--bb-line-light);
  color:var(--bb-paper);
  font-family:var(--bb-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  cursor:pointer;
  transition:background-color .22s ease,border-color .22s ease;
}
.bb-nav-toggle:hover{border-color:var(--bb-blue);background:rgba(31,168,255,.16)}
.bb-nav-toggle[data-open="true"]{background:var(--bb-red);border-color:var(--bb-red);color:#fff}
.bb-nav-toggle__bars{
  position:relative;
  flex:none;
  width:16px;
  height:10px;
  background-image:linear-gradient(currentColor,currentColor),linear-gradient(currentColor,currentColor),linear-gradient(currentColor,currentColor);
  background-repeat:no-repeat;
  background-position:0 0,0 4px,0 8px;
  background-size:100% 2px;
}
.bb-nav-toggle__text{white-space:nowrap}

/* 阅读进度 */
.bb-progress{
  height:3px;
  background:rgba(245,242,236,.1);
}
.bb-progress__bar{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--bb-blue),var(--bb-red) 68%,var(--bb-gold));
}

/* ---------- 5. 通用按钮 ---------- */
.bb-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:.62em 1.05em;
  font-family:var(--bb-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  text-decoration:none;
  cursor:pointer;
  background:transparent;
  color:var(--bb-paper);
  border:1px solid var(--bb-line-light);
  border-left-width:3px;
  border-left-color:var(--bb-blue);
  transition:background-color .22s ease,color .22s ease,border-color .22s ease;
}
.bb-btn:hover,.bb-btn:focus-visible{background:rgba(31,168,255,.18);border-color:var(--bb-blue);color:#fff}
.bb-btn--solid{background:var(--bb-red);border-color:var(--bb-red);border-left-color:var(--bb-red-dark);color:#fff}
.bb-btn--solid:hover,.bb-btn--solid:focus-visible{background:var(--bb-red-dark);border-color:var(--bb-red-dark);color:#fff}
.bb-btn--line{border-left-color:var(--bb-gold)}
.bb-btn--line:hover,.bb-btn--line:focus-visible{background:rgba(201,162,39,.2);border-color:var(--bb-gold);color:var(--bb-gold-light)}
.bb-btn--paper{color:var(--bb-text);border-color:var(--bb-line-dark);border-left-color:var(--bb-red)}
.bb-btn--paper:hover,.bb-btn--paper:focus-visible{background:rgba(224,43,60,.1);border-color:var(--bb-red);color:var(--bb-red-dark)}

/* ---------- 6. 页脚档案区 ---------- */
.bb-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--bb-ink);
  color:var(--bb-paper);
  border-top:2px solid var(--bb-gold);
}
.bb-footer__grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.2fr 1fr;
  gap:clamp(20px,3.4vw,48px);
  max-width:var(--bb-wrap);
  margin:0 auto;
  padding:clamp(36px,5.5vw,64px) var(--bb-pad) clamp(20px,3vw,32px);
}
.bb-footer__col{min-width:0}
.bb-footer__title{
  margin:0 0 16px;
  padding-bottom:8px;
  font-family:var(--bb-mono);
  font-size:12px;
  font-weight:400;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--bb-gold-light);
  border-bottom:1px solid rgba(235,208,138,.28);
}
.bb-footer__desc{
  margin:16px 0 0;
  font-size:14px;
  line-height:1.8;
  color:rgba(245,242,236,.7);
}
.bb-footer__list{
  display:grid;
  gap:9px;
  margin:0;
  padding:0;
  list-style:none;
}
.bb-footer__item{min-width:0}
.bb-footer__link{
  font-size:15px;
  color:rgba(245,242,236,.84);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.bb-footer__link:hover,.bb-footer__link:focus-visible{color:#fff;border-bottom-color:var(--bb-red)}
.bb-footer__key{
  display:block;
  font-family:var(--bb-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--bb-blue-light);
}
.bb-footer__value{
  display:block;
  font-size:15px;
  color:rgba(245,242,236,.88);
  word-break:break-word;
}
.bb-footer__value--mono{font-family:var(--bb-mono);letter-spacing:.04em}
.bb-footer__note{
  max-width:var(--bb-wrap);
  margin:0 auto;
  padding:0 var(--bb-pad) 20px;
  font-size:14px;
  color:var(--bb-gold-light);
}
.bb-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  max-width:var(--bb-wrap);
  margin:0 auto;
  padding:16px var(--bb-pad) 30px;
  border-top:1px solid rgba(235,208,138,.28);
}
.bb-footer__meta{
  margin:0;
  font-family:var(--bb-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(245,242,236,.6);
}
.bb-footer__badge{
  display:inline-block;
  padding:3px 9px;
  font-family:var(--bb-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--bb-gold-light);
  border:1px solid rgba(201,162,39,.5);
  background:rgba(201,162,39,.08);
}

/* ---------- 7. 版式容器与分区 ---------- */
.bb-wrap{
  width:100%;
  max-width:var(--bb-wrap);
  margin:0 auto;
  padding:0 var(--bb-pad);
}
.bb-section{
  position:relative;
  padding:clamp(40px,6vw,80px) 0;
}
.bb-section--paper{background:var(--bb-paper)}
.bb-section--ink{background:var(--bb-ink);color:var(--bb-paper)}
.bb-section--board{background:var(--bb-board);color:var(--bb-paper)}
.bb-section--ink a,.bb-section--board a{color:var(--bb-blue-light)}
.bb-section--ink a:hover,.bb-section--board a:hover{color:#fff}
.bb-section--ink .bb-lede,.bb-section--board .bb-lede{color:rgba(245,242,236,.75)}
.bb-section--ink .bb-label,.bb-section--board .bb-label{color:var(--bb-gold-light)}
.bb-section--ink .bb-rule,.bb-section--board .bb-rule{background:linear-gradient(90deg,var(--bb-gold),transparent)}
.bb-section--ink .bb-tabs__list,.bb-section--board .bb-tabs__list{border-bottom-color:var(--bb-line-light)}
.bb-section--ink .bb-tab,.bb-section--board .bb-tab{color:rgba(245,242,236,.66)}
.bb-section--ink .bb-prose a,.bb-section--board .bb-prose a{color:var(--bb-blue-light)}

.bb-label{
  display:inline-block;
  margin:0 0 12px;
  font-family:var(--bb-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--bb-red);
}
.bb-label--gold{color:var(--bb-gold)}
.bb-label--blue{color:var(--bb-blue)}
.bb-lede{
  max-width:60ch;
  margin:0 0 1.2em;
  font-size:var(--bb-fs-18);
  color:rgba(43,47,54,.78);
}
.bb-rule{
  height:1px;
  margin:clamp(24px,4vw,40px) 0;
  border:0;
  background:linear-gradient(90deg,var(--bb-gold),transparent);
}
.bb-prose{max-width:74ch}
.bb-prose p{margin:0 0 1.15em}
.bb-prose h2,.bb-prose h3{margin-top:1.6em}
.bb-prose ul,.bb-prose ol{margin:0 0 1.15em}

/* ---------- 8. 网格 ---------- */
.bb-grid{display:grid;gap:var(--bb-gap)}
.bb-grid--auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.bb-grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.bb-span-4{grid-column:span 4}
.bb-span-5{grid-column:span 5}
.bb-span-6{grid-column:span 6}
.bb-span-7{grid-column:span 7}
.bb-span-8{grid-column:span 8}

/* ---------- 9. 面板 / 标签 / 数据 ---------- */
.bb-panel{
  position:relative;
  padding:var(--bb-gap);
  background:var(--bb-board);
  color:var(--bb-paper);
  border:1px solid var(--bb-line-light);
}
.bb-panel--paper{
  background:#fff;
  color:var(--bb-text);
  border-color:var(--bb-line-dark);
}
.bb-panel--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%)}

.bb-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  font-family:var(--bb-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  border:1px solid currentColor;
  color:var(--bb-blue);
}
.bb-tag--red{color:var(--bb-red)}
.bb-tag--gold{color:var(--bb-gold)}
.bb-tag--green{color:var(--bb-green)}
.bb-badge{
  display:inline-flex;
  align-items:center;
  padding:6px 12px;
  font-family:var(--bb-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
  color:#fff;
  background:var(--bb-red);
  clip-path:polygon(0 0,100% 0,calc(100% - 10px) 100%,0 100%);
}
.bb-stat{display:grid;gap:6px}
.bb-stat__num{
  font-family:var(--bb-mono);
  font-weight:700;
  font-size:clamp(2.4rem,7vw,4.2rem);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--bb-red);
}
.bb-stat__num--blue{color:var(--bb-blue)}
.bb-stat__num--gold{color:var(--bb-gold)}
.bb-stat__label{
  font-size:13px;
  letter-spacing:.08em;
  color:rgba(43,47,54,.7);
}
.bb-section--ink .bb-stat__label,.bb-section--board .bb-stat__label,
.bb-panel .bb-stat__label{color:rgba(245,242,236,.72)}

/* ---------- 10. 图片容器（页面阶段放置占位/图片） ---------- */
.bb-media{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  background:var(--bb-board);
  border:1px solid var(--bb-line-dark);
}
.bb-media__img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.92) contrast(1.06);
}
.bb-media__cap{
  position:absolute;
  left:0;
  bottom:0;
  z-index:2;
  padding:6px 10px;
  background:var(--bb-ink);
  color:var(--bb-paper);
  font-family:var(--bb-mono);
  font-size:11px;
  letter-spacing:.08em;
}
.bb-media::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(255,255,255,.05) 0 1px,transparent 1px 4px);
}
.bb-media::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  box-shadow:inset 0 0 0 1px rgba(245,242,236,.12);
}
.bb-media--ph{
  background-image:
    repeating-linear-gradient(135deg,rgba(31,168,255,.12) 0 10px,transparent 10px 20px),
    repeating-linear-gradient(0deg,rgba(245,242,236,.05) 0 1px,transparent 1px 4px);
}
.bb-media--4x3{aspect-ratio:4/3}
.bb-media--1x1{aspect-ratio:1/1}
.bb-media--3x4{aspect-ratio:3/4}
.bb-media--21x9{aspect-ratio:21/9}

/* ---------- 11. 折叠面板 ---------- */
.bb-accordion{
  display:grid;
  gap:1px;
  background:var(--bb-line-dark);
  border:1px solid var(--bb-line-dark);
}
.bb-accordion__item{background:var(--bb-paper)}
.bb-accordion__item.is-open{background:#fff}
.bb-accordion__trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  padding:16px 18px;
  background:transparent;
  border:0;
  font-weight:700;
  font-size:16px;
  text-align:left;
  color:inherit;
  cursor:pointer;
}
.bb-accordion__trigger::after{
  content:"+";
  flex:none;
  font-family:var(--bb-mono);
  font-size:18px;
  line-height:1;
  color:var(--bb-red);
}
.bb-accordion__item.is-open .bb-accordion__trigger::after{content:"–"}
.bb-accordion__trigger:hover{background:rgba(224,43,60,.06)}
.bb-accordion__trigger:focus-visible{outline:2px solid var(--bb-blue);outline-offset:-3px}
.bb-accordion__panel{padding:0 18px 18px;font-size:15px}
.bb-accordion__panel[hidden]{display:none}

/* ---------- 12. 标签页 ---------- */
.bb-tabs{display:grid;gap:var(--bb-gap)}
.bb-tabs__list{
  display:flex;
  flex-wrap:wrap;
  gap:1px;
  border-bottom:1px solid var(--bb-line-dark);
}
.bb-tab{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  background:transparent;
  border:0;
  border-bottom:2px solid transparent;
  font-family:var(--bb-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(43,47,54,.62);
  cursor:pointer;
  transition:color .2s ease,background-color .2s ease,border-color .2s ease;
}
.bb-tab:hover{color:var(--bb-red)}
.bb-tab.is-active{
  color:var(--bb-red);
  background:rgba(224,43,60,.07);
  border-bottom-color:var(--bb-red);
}
.bb-tab:focus-visible{outline:2px solid var(--bb-blue);outline-offset:-2px}
.bb-tabs__panel[hidden]{display:none}
.bb-tabs__panel:focus{outline:none}

/* ---------- 13. 面包屑与锚点目录 ---------- */
.bb-crumb{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:0 0 18px;
  font-family:var(--bb-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:rgba(43,47,54,.6);
}
.bb-crumb a{color:inherit;text-decoration:none;border-bottom:1px solid rgba(43,47,54,.3)}
.bb-crumb a:hover{color:var(--bb-red);border-bottom-color:var(--bb-red)}
.bb-crumb__sep{color:var(--bb-gold)}
.bb-crumb [aria-current="page"]{color:var(--bb-red)}
.bb-spy{display:grid;gap:2px;margin:0;padding:0;list-style:none}
.bb-spy__link{
  display:block;
  padding:7px 12px;
  font-size:14px;
  color:rgba(43,47,54,.7);
  text-decoration:none;
  border-left:2px solid transparent;
  transition:color .2s ease,border-color .2s ease,background-color .2s ease;
}
.bb-spy__link:hover{color:var(--bb-red)}
.bb-spy__link.is-active{
  color:var(--bb-red);
  border-left-color:var(--bb-red);
  background:rgba(224,43,60,.07);
}
.bb-section--ink .bb-spy__link,.bb-section--board .bb-spy__link{color:rgba(245,242,236,.7)}
.bb-section--ink .bb-spy__link.is-active,.bb-section--board .bb-spy__link.is-active{color:#fff}

/* ---------- 14. 显现动效 ---------- */
.bb-js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .32s ease,transform .32s ease;
}
.bb-js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 15. 响应式 ---------- */
@media (max-width:1080px){
  .bb-footer__grid{grid-template-columns:1fr 1fr}
  .bb-span-4,.bb-span-5,.bb-span-7,.bb-span-8{grid-column:span 12}
  .bb-span-6{grid-column:span 12}
}
@media (max-width:999px){
  html{scroll-padding-top:150px}
  .bb-nav-toggle{display:inline-flex}
  .bb-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    z-index:130;
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    border-top:1px solid var(--bb-line-light);
    transition:max-height .28s ease,visibility .28s ease;
  }
  .bb-nav[data-open]{
    max-height:72vh;
    overflow:auto;
    visibility:visible;
    border-bottom:2px solid var(--bb-red);
  }
  .bb-nav__list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .bb-nav__item{border-left:0;border-top:1px solid var(--bb-line-light)}
  .bb-nav__item:first-child{border-left:0}
  .bb-nav__item:last-child{border-right:0}
  .bb-nav__link{padding:15px 18px}
  .bb-grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
}
@media (max-width:720px){
  .bb-index{
    grid-template-columns:minmax(0,1fr) auto;
    row-gap:10px;
    padding:10px 14px;
  }
  .bb-index__actions{display:none}
  .bb-brand__sub{display:none}
  .bb-ticker{
    grid-column:1 / -1;
    padding:0;
    border-left:0;
    border-right:0;
    border-top:1px solid var(--bb-line-light);
    padding-top:8px;
  }
  .bb-nav__list{grid-template-columns:minmax(0,1fr)}
  .bb-footer__grid{grid-template-columns:minmax(0,1fr)}
  .bb-footer__bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .bb-grid--12{grid-template-columns:minmax(0,1fr)}
  .bb-span-4,.bb-span-5,.bb-span-6,.bb-span-7,.bb-span-8{grid-column:span 1}
  .bb-media--21x9{aspect-ratio:16/9}
}

/* ---------- 16. 减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .bb-ticker__track{animation:none}
  .bb-js [data-reveal]{opacity:1;transform:none}
  .bb-nav{transition:none}
}