/* ===========================================================
   小鸟体育 · 共享样式 /assets/site.css
   基调：看台夜色 · 荧光青数据 · 暖橙行动 · -6° 斜切
   =========================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,video{display:block;max-width:100%}
input{font:inherit}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

/* ---------- 2. 变量 ---------- */
:root{
  --bv-night:#0A1424;
  --bv-deep:#0F1E33;
  --bv-panel:#16294A;
  --bv-ink:#DCE7F5;
  --bv-mist:#8FA3BF;
  --bv-cyan:#2CE8C0;
  --bv-cyan-soft:#7CF5DC;
  --bv-orange:#FF8A3D;
  --bv-orange-hi:#FFA35F;
  --bv-line:#1B3A5C;
  --bv-paper:#E9F0FA;
  --bv-ink-dark:#101C2E;

  --bv-rail-w:220px;
  --bv-radius-l:28px;
  --bv-radius-m:20px;
  --bv-radius-s:14px;
  --bv-pill:999px;
  --bv-gap:24px;
  --bv-slant:-6deg;

  --bv-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --bv-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Noto Sans Mono CJK SC",monospace;
}

/* ---------- 3. 基础排版 ---------- */
body{
  background-color:var(--bv-night);
  color:var(--bv-ink);
  font-family:var(--bv-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(60% 42% at 82% -8%,rgba(44,232,192,.10),transparent 68%),
    radial-gradient(52% 34% at 6% 106%,rgba(255,138,61,.08),transparent 70%);
}
#main-content{position:relative;z-index:1;display:block}
#main-content:focus{outline:none}

:focus-visible{outline:2px solid var(--bv-cyan-soft);outline-offset:3px;border-radius:6px}

.bv-kicker{font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;color:var(--bv-mist);text-transform:uppercase}
.bv-note{font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;color:var(--bv-mist)}
.bv-h1{font-size:clamp(36px,6vw,72px);line-height:1.02;letter-spacing:-.02em;font-weight:800}
.bv-h2{font-size:clamp(26px,3.4vw,40px);line-height:1.1;letter-spacing:-.01em;font-weight:800}
.bv-h3{font-size:20px;line-height:1.35;font-weight:700}
.bv-lead{max-width:34em;font-size:clamp(18px,1.6vw,21px);line-height:1.7;color:var(--bv-ink)}
.bv-prose{max-width:38em;font-size:17px;line-height:1.75}
.bv-prose p{margin-bottom:1.2em}
.bv-prose a{color:var(--bv-cyan);border-bottom:1px solid rgba(44,232,192,.4)}
.bv-score{
  font-family:var(--bv-sans);font-weight:900;font-stretch:75%;
  font-size:clamp(46px,8vw,104px);line-height:.95;letter-spacing:-.04em;
  font-variant-numeric:tabular-nums;color:var(--bv-cyan);
}
.bv-tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--bv-mono);font-size:12px;letter-spacing:.06em;
  padding:4px 12px;border-radius:var(--bv-pill);
  border:1px solid var(--bv-line);background:rgba(22,41,74,.6);color:var(--bv-mist);
}
.bv-slash{display:block;width:58px;height:6px;border-radius:var(--bv-pill);background:var(--bv-cyan);transform:rotate(var(--bv-slant));transform-origin:left center}

/* ---------- 4. 容器与栅格 ---------- */
.bv-page{width:100%;max-width:1280px;margin:0 auto;padding:clamp(28px,4vw,64px) clamp(20px,3.5vw,52px) 0}
.bv-section{position:relative;padding-block:clamp(38px,5.5vw,84px)}
.bv-sep{height:1px;background:var(--bv-line);border:0;margin:0}
.bv-breathe{height:96px}
.bv-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--bv-gap)}
.bv-col-3{grid-column:span 3}
.bv-col-4{grid-column:span 4}
.bv-col-5{grid-column:span 5}
.bv-col-7{grid-column:span 7}
.bv-col-8{grid-column:span 8}
.bv-col-9{grid-column:span 9}
.bv-col-12{grid-column:span 12}
.bv-lift-sm{margin-top:24px}
.bv-lift-md{margin-top:48px}
.bv-lift-lg{margin-top:72px}

/* ---------- 5. 按钮 ---------- */
.bv-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 24px;border-radius:var(--bv-pill);
  border:1px solid transparent;font-size:15px;font-weight:600;line-height:1.2;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.bv-btn:hover{transform:translateY(-1px)}
.bv-btn--action{background:var(--bv-orange);color:var(--bv-ink-dark)}
.bv-btn--action:hover{background:var(--bv-orange-hi)}
.bv-btn--ghost{border-color:var(--bv-line);color:var(--bv-ink);background:rgba(22,41,74,.5)}
.bv-btn--ghost:hover{border-color:var(--bv-mist)}
.bv-btn--cyan{border-color:var(--bv-cyan);color:var(--bv-cyan);background:rgba(44,232,192,.08)}
.bv-btn--cyan:hover{background:rgba(44,232,192,.16)}

/* ---------- 6. 头部：跳过链接 / 顶条 / 轨道 ---------- */
.bv-skip{
  position:absolute;left:12px;top:-72px;z-index:80;
  background:var(--bv-orange);color:var(--bv-ink-dark);
  padding:10px 18px;border-radius:var(--bv-pill);
  font-size:14px;font-weight:600;transition:top .2s ease;
}
.bv-skip:focus{top:12px}

.bv-header{position:relative;z-index:50}

.bv-brand{display:flex;align-items:center;gap:10px;color:var(--bv-ink)}
.bv-brand__mark{
  position:relative;flex:0 0 auto;width:30px;height:30px;border-radius:10px;
  border:1px solid var(--bv-line);
  background:
    linear-gradient(-6deg,transparent 45%,var(--bv-cyan) 45%,var(--bv-cyan) 55%,transparent 55%),
    linear-gradient(160deg,#16294A,#0F1E33);
}
.bv-brand__mark::after{
  content:"";position:absolute;right:6px;top:6px;width:5px;height:5px;border-radius:50%;
  background:var(--bv-orange);
}
.bv-brand__mark--lg{width:40px;height:40px;border-radius:13px}
.bv-brand__text{display:flex;flex-direction:column;gap:2px;min-width:0}
.bv-brand__name{font-size:17px;font-weight:800;letter-spacing:.01em;line-height:1.2}
.bv-brand__sub{font-family:var(--bv-mono);font-size:11px;letter-spacing:.06em;color:var(--bv-mist);line-height:1.4}

/* 移动端顶条 */
.bv-topbar{
  display:none;align-items:center;justify-content:space-between;gap:12px;
  position:sticky;top:0;z-index:52;
  padding:10px 16px;
  background:rgba(10,20,36,.96);
  border-bottom:1px solid var(--bv-line);
}
.bv-brand--bar .bv-brand__sub{font-size:10px}
.bv-burger{
  display:inline-flex;align-items:center;gap:10px;
  padding:8px 16px;border-radius:var(--bv-pill);
  border:1px solid var(--bv-line);background:rgba(22,41,74,.6);
  font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;color:var(--bv-ink);
}
.bv-burger__bars{position:relative;display:block;width:18px;height:12px}
.bv-burger__bars::before,
.bv-burger__bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;border-radius:2px;background:var(--bv-cyan);
  transition:transform .25s ease,top .25s ease,bottom .25s ease;
}
.bv-burger__bars::before{top:1px}
.bv-burger__bars::after{bottom:1px}
.bv-burger[aria-expanded="true"] .bv-burger__bars::before{top:5px;transform:rotate(45deg)}
.bv-burger[aria-expanded="true"] .bv-burger__bars::after{bottom:5px;transform:rotate(-45deg)}

/* 侧边轨道 */
.bv-rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--bv-rail-w);z-index:55;
  display:flex;flex-direction:column;gap:22px;
  padding:26px 20px 22px;
  overflow-y:auto;
  background:linear-gradient(180deg,var(--bv-deep),var(--bv-night));
  border-right:1px solid var(--bv-line);
}
.bv-brand--rail{flex-direction:column;align-items:flex-start;gap:12px;padding:0 4px}
.bv-nav{display:block}
.bv-nav__label{
  display:block;margin:0 0 10px;padding-left:12px;
  font-family:var(--bv-mono);font-size:11px;letter-spacing:.1em;
  color:var(--bv-mist);text-transform:uppercase;
}
.bv-nav__list{display:flex;flex-direction:column;gap:2px}
.bv-nav__link{
  display:flex;align-items:center;gap:12px;
  padding:10px 12px;border-radius:var(--bv-radius-s);
  font-size:15px;color:var(--bv-mist);
  transition:color .2s ease,background-color .2s ease,transform .2s ease;
}
.bv-nav__link:hover{color:var(--bv-ink);background:rgba(22,41,74,.85)}
.bv-nav__link[aria-current="page"]{
  color:var(--bv-cyan);background:rgba(44,232,192,.09);transform:translateX(4px);
}
.bv-nav__idx{font-family:var(--bv-mono);font-size:12px;letter-spacing:.06em;opacity:.7}
.bv-nav__link[aria-current="page"] .bv-nav__idx{opacity:1}
.bv-nav__text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.bv-rail__search{display:block}
.bv-input{
  width:100%;padding:10px 14px;border-radius:var(--bv-pill);
  font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;
  color:var(--bv-ink);background:rgba(22,41,74,.55);
  border:1px solid var(--bv-line);
  transition:border-color .2s ease,background-color .2s ease;
}
.bv-input::placeholder{color:var(--bv-mist);opacity:.85}
.bv-input:focus{border-color:var(--bv-cyan);background:rgba(22,41,74,.9);outline:none}
.bv-input:focus-visible{outline:2px solid var(--bv-cyan-soft);outline-offset:2px}

.bv-rail__cta{width:100%}
.bv-rail__foot{
  display:flex;align-items:baseline;justify-content:space-between;gap:8px;
  margin-top:auto;padding:14px 12px 0;border-top:1px solid var(--bv-line);
}
.bv-rail__foot .bv-nav__label{margin:0;padding-left:0}
.bv-rail__pct{font-family:var(--bv-mono);font-size:14px;letter-spacing:.06em;color:var(--bv-cyan)}

.bv-scrim{
  position:fixed;inset:0;z-index:48;
  background:rgba(4,9,18,.66);
  opacity:0;pointer-events:none;
  transition:opacity .28s ease;
}
.bv-scrim[data-open]{opacity:1;pointer-events:auto}

.bv-progress{
  position:fixed;top:0;right:0;z-index:60;width:3px;height:100vh;
  background:rgba(27,58,92,.55);pointer-events:none;
}
.bv-progress__fill{display:block;width:100%;height:0;background:var(--bv-cyan)}

/* ---------- 7. 通用组件 ---------- */
.bv-crumbs{font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;color:var(--bv-mist)}
.bv-crumbs ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.bv-crumbs li::after{content:"/";margin-left:8px;color:var(--bv-line)}
.bv-crumbs li:last-child::after{content:"";margin:0}
.bv-crumbs__link:hover{color:var(--bv-cyan)}
.bv-crumbs__current{color:var(--bv-ink)}

.bv-card{
  position:relative;padding:24px 26px;
  border-radius:var(--bv-radius-l);
  background:var(--bv-deep);
  border:1px solid var(--bv-line);
}
.bv-card--score{padding:22px 24px;background:linear-gradient(160deg,var(--bv-panel),var(--bv-deep))}
.bv-score__note{margin-top:8px;font-family:var(--bv-mono);font-size:12px;letter-spacing:.06em;color:var(--bv-mist)}
.bv-card--board{padding:18px}
.bv-card--index{
  display:flex;align-items:center;gap:16px;padding:18px 22px;
  border-radius:var(--bv-radius-m);background:rgba(15,30,51,.86);
  transition:border-color .2s ease,background-color .2s ease;
}
.bv-card--index:hover{border-color:var(--bv-cyan);background:rgba(22,41,74,.9)}
.bv-card__num{font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;color:var(--bv-cyan)}
.bv-card__title{flex:1;font-weight:600;font-size:16px}
.bv-card__meta{font-family:var(--bv-mono);font-size:12px;letter-spacing:.06em;color:var(--bv-mist)}
.bv-card__arrow{color:var(--bv-mist);transition:transform .2s ease,color .2s ease}
.bv-card--index:hover .bv-card__arrow{transform:translateX(4px);color:var(--bv-cyan)}

.bv-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px}
.bv-pitch{
  position:relative;min-height:180px;border-radius:var(--bv-radius-m);
  border:1px solid var(--bv-line);background-color:rgba(22,41,74,.45);
  background-image:radial-gradient(circle,rgba(44,232,192,.34) 1.5px,transparent 1.6px);
  background-size:26px 26px;
}

.bv-table-wrap{overflow-x:auto;border-radius:var(--bv-radius-m);border:1px solid var(--bv-line);background:var(--bv-deep)}
.bv-table{min-width:560px;font-size:15px}
.bv-table caption{caption-side:top;text-align:left;padding:14px 16px;font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;color:var(--bv-mist)}
.bv-table th{
  padding:12px 16px;text-align:left;white-space:nowrap;
  font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;font-weight:500;
  color:var(--bv-mist);border-bottom:1px solid var(--bv-line);
}
.bv-table td{padding:12px 16px;height:44px;border-bottom:1px solid rgba(27,58,92,.6)}
.bv-table tbody tr:nth-child(odd){background:var(--bv-panel)}
.bv-table tbody tr:hover{background:rgba(44,232,192,.07)}
.bv-table .bv-num{font-family:var(--bv-mono);letter-spacing:.06em;color:var(--bv-cyan);font-variant-numeric:tabular-nums}

.bv-chips{display:flex;flex-wrap:wrap;gap:10px}
.bv-chip{
  padding:8px 16px;border-radius:var(--bv-pill);
  font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;
  color:var(--bv-mist);background:transparent;border:1px solid var(--bv-line);
  transition:color .2s ease,border-color .2s ease,background-color .2s ease;
}
.bv-chip:hover{color:var(--bv-ink);border-color:var(--bv-mist)}
.bv-chip[aria-pressed="true"],.bv-chip.is-active{color:var(--bv-cyan);border-color:var(--bv-cyan);background:rgba(44,232,192,.1)}

.bv-timeline{display:flex;flex-direction:column;gap:2px}
.bv-timeline__item{position:relative;padding:14px 16px 14px 34px;border-left:1px solid var(--bv-line)}
.bv-timeline__item::before{
  content:"";position:absolute;left:-4px;top:22px;
  width:7px;height:7px;border-radius:50%;background:var(--bv-cyan);
}
.bv-timeline__title{font-size:16px;font-weight:600}
.bv-timeline__source{
  display:block;margin-top:4px;
  font-family:var(--bv-mono);font-size:12px;letter-spacing:.06em;color:var(--bv-mist);
  opacity:0;transition:opacity .2s ease;
}
.bv-timeline__item:hover .bv-timeline__source,
.bv-timeline__item:focus-within .bv-timeline__source,
.bv-timeline__item[data-locked] .bv-timeline__source{opacity:1}

.bv-band{
  position:relative;padding:clamp(24px,4vw,46px);
  border-radius:var(--bv-radius-l);
  background:var(--bv-paper);color:var(--bv-ink-dark);
}
.bv-band--slant{
  border-radius:0 0 var(--bv-radius-l) var(--bv-radius-l);
  clip-path:polygon(0 30px,100% 0,100% 100%,0 100%);
  padding-top:calc(clamp(24px,4vw,46px) + 30px);
}
.bv-band .bv-kicker,
.bv-band .bv-note{color:#3B5578}
.bv-band a{color:#0E6B58;border-bottom:1px solid rgba(14,107,88,.35)}

.bv-media{
  position:relative;display:block;width:100%;aspect-ratio:16/9;
  border-radius:var(--bv-radius-l);overflow:hidden;
  border:1px solid var(--bv-line);
  background:linear-gradient(165deg,var(--bv-panel),var(--bv-night));
}
.bv-media img{width:100%;height:100%;object-fit:cover}
.bv-media--wide{aspect-ratio:21/9}
.bv-media--square{aspect-ratio:1/1}
.bv-media--tall{aspect-ratio:3/4}
.bv-media--slant{clip-path:polygon(0 0,100% 0,100% calc(100% - 34px),calc(100% - 68px) 100%,0 100%)}
.bv-media__caption{
  margin-top:8px;font-family:var(--bv-mono);font-size:12px;letter-spacing:.06em;color:var(--bv-mist);
}

/* ---------- 8. 页脚 ---------- */
.bv-footer{
  position:relative;z-index:1;margin-top:96px;
  border-top:1px solid var(--bv-line);
  background:linear-gradient(180deg,var(--bv-night),var(--bv-deep));
}
.bv-footer__inner{max-width:1280px;margin:0 auto;padding:56px clamp(20px,3.5vw,52px) 40px}
.bv-footer__top{
  display:flex;flex-wrap:wrap;gap:20px;align-items:flex-end;justify-content:space-between;
  padding-bottom:28px;border-bottom:1px solid var(--bv-line);
}
.bv-footer__brand{display:flex;flex-direction:column;gap:8px;align-items:flex-start}
.bv-footer__name{font-size:20px;font-weight:800;letter-spacing:.01em}
.bv-footer__tag{font-family:var(--bv-mono);font-size:12px;letter-spacing:.06em;color:var(--bv-mist)}
.bv-to-top{
  padding:10px 20px;border-radius:var(--bv-pill);
  border:1px solid var(--bv-line);background:rgba(22,41,74,.5);
  font-family:var(--bv-mono);font-size:13px;letter-spacing:.06em;color:var(--bv-ink);
  transition:border-color .2s ease,color .2s ease;
}
.bv-to-top:hover{border-color:var(--bv-cyan);color:var(--bv-cyan)}

.bv-footer__grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px;
  padding:34px 0;
}
.bv-footer__col{min-width:0}
.bv-footer__title{
  margin-bottom:14px;font-family:var(--bv-mono);font-size:12px;
  letter-spacing:.1em;font-weight:500;color:var(--bv-mist);text-transform:uppercase;
}
.bv-footer__list{display:flex;flex-direction:column;gap:4px}
.bv-footer__link{
  display:inline-block;padding:4px 0;font-size:15px;color:var(--bv-ink);
  transition:color .2s ease,transform .2s ease;
}
.bv-footer__link:hover{color:var(--bv-cyan);transform:translateX(3px)}

.bv-footer__contact{
  display:flex;flex-wrap:wrap;gap:8px 32px;align-items:baseline;
  padding:22px 0;border-top:1px solid var(--bv-line);border-bottom:1px solid var(--bv-line);
}
.bv-footer__contact-item{display:flex;align-items:baseline;gap:10px;font-size:15px}
.bv-footer__label{font-family:var(--bv-mono);font-size:12px;letter-spacing:.06em;color:var(--bv-mist)}
.bv-footer__value{color:var(--bv-ink);font-variant-numeric:tabular-nums}
.bv-footer__contact-note{flex:1 1 320px;font-size:14px;color:var(--bv-mist)}

.bv-footer__bottom{
  display:flex;flex-wrap:wrap;gap:8px 28px;align-items:baseline;justify-content:space-between;
  padding-top:22px;font-family:var(--bv-mono);font-size:12px;letter-spacing:.06em;color:var(--bv-mist);
}
.bv-footer__addr,.bv-footer__icp,.bv-footer__copy{margin:0}
.bv-footer__icp{color:var(--bv-mist)}

/* ---------- 9. 显现动画 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .4s ease,transform .32s ease;
  transition-delay:var(--bv-delay,0s);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 10. 响应式 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--bv-rail-w)}
  .bv-topbar{display:none}
  .bv-rail{transform:none}
  .bv-scrim{display:none}
}
@media (max-width:1023px){
  html{scroll-padding-top:70px}
  .bv-topbar{display:flex}
  .bv-rail{
    width:min(300px,86vw);
    transform:translateX(-104%);
    transition:transform .3s ease;
    box-shadow:0 0 40px rgba(0,0,0,.5);
  }
  .bv-rail[data-open]{transform:translateX(0)}
  body[data-nav-open]{overflow:hidden}
  .bv-grid{grid-template-columns:repeat(6,minmax(0,1fr))}
  .bv-col-3,.bv-col-4,.bv-col-5{grid-column:span 3}
  .bv-col-7,.bv-col-8,.bv-col-9{grid-column:span 6}
  .bv-lift-sm{margin-top:18px}
  .bv-lift-md{margin-top:28px}
  .bv-lift-lg{margin-top:36px}
}
@media (max-width:900px){
  .bv-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
}
@media (max-width:640px){
  body{font-size:16px}
  .bv-grid{grid-template-columns:1fr;gap:18px}
  .bv-col-3,.bv-col-4,.bv-col-5,.bv-col-7,.bv-col-8,.bv-col-9,.bv-col-12{grid-column:1 / -1}
  .bv-lift-sm,.bv-lift-md,.bv-lift-lg{margin-top:0}
  .bv-breathe{height:56px}
  .bv-card{padding:20px}
  .bv-band--slant{clip-path:polygon(0 18px,100% 0,100% 100%,0 100%);padding-top:calc(20px + 18px)}
  .bv-footer{margin-top:64px}
  .bv-footer__inner{padding-top:40px}
  .bv-footer__grid{grid-template-columns:1fr;gap:26px}
  .bv-footer__bottom{flex-direction:column;gap:6px}
  .bv-media{border-radius:var(--bv-radius-m)}
}

/* ---------- 11. 减少动态效果 ---------- */
@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;transform:none}
  .bv-btn:hover{transform:none}
  .bv-footer__link:hover{transform:none}
  .bv-nav__link[aria-current="page"]{transform:none}
}