/* ============================================================
   B体育主站 · 共享样式 /assets/site.css
   未来运动数据舱：深空蓝底 / 侧边轨道 / 堆叠画板 / 等宽索引
   ============================================================ */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:var(--c-cyan);text-decoration:none}
a:hover{text-decoration:none}

/* ---------- 2. 变量 ---------- */
:root{
  --c-deep:#07111F;
  --c-pod:#0B1B33;
  --c-line:#1E3A5F;
  --c-cyan:#22E6D2;
  --c-orange:#FF7A1A;
  --c-green:#4DE38A;
  --c-purple:#8B5CF6;
  --c-ink:#E6F1FF;
  --c-dim:#9BB0C9;
  --c-danger:#FF5C7A;

  --rail-w:288px;
  --topbar-h:64px;
  --shell-max:1200px;
  --pad:clamp(18px,4vw,44px);
  --gap:clamp(16px,2.4vw,28px);

  --font-display:"Helvetica Neue","Arial Black",ui-sans-serif,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",sans-serif;
  --font-body:ui-sans-serif,-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --r-sm:10px;
  --r-md:16px;
  --r-lg:26px;
  --r-pill:999px;
  --ease:cubic-bezier(.2,.7,.2,1);
  --shadow-1:0 26px 64px -36px rgba(0,0,0,.95);
  --shadow-2:0 18px 44px -24px rgba(34,230,210,.45);
}

/* ---------- 3. 基础与中文排版 ---------- */
body{
  min-height:100vh;
  padding-left:var(--rail-w);
  background-color:var(--c-deep);
  background-image:
    radial-gradient(circle at 78% -12%,rgba(34,230,210,.12),transparent 46%),
    radial-gradient(circle at 10% 6%,rgba(139,92,246,.12),transparent 42%);
  background-attachment:fixed;
  color:var(--c-ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
#main-content{display:block;min-height:56vh;scroll-margin-top:88px}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.14;
  letter-spacing:.005em;
  color:var(--c-ink);
  text-wrap:balance;
}
p{text-wrap:pretty}
:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px;border-radius:6px}

/* ---------- 4. 排版与通用文本组件 ---------- */
.display-1{font-size:clamp(2.4rem,5vw,5.6rem);line-height:1.02;letter-spacing:-.01em}
.h-section{font-size:clamp(1.5rem,3vw,2.6rem)}
.lede{max-width:62ch;font-size:clamp(1rem,1.4vw,1.125rem);line-height:1.8;color:var(--c-dim)}
.eyebrow{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--c-cyan);
}
.eyebrow::before{content:"";width:24px;height:1px;background:currentColor;opacity:.7}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.rule{height:1px;border:0;margin-block:clamp(22px,3vw,36px);
  background:linear-gradient(90deg,rgba(34,230,210,.55),rgba(139,92,246,.35) 52%,transparent)}

/* ---------- 5. 容器与画板 ---------- */
.shell{width:100%;max-width:var(--shell-max);margin-inline:auto;padding-inline:var(--pad)}
.section{position:relative;padding-block:clamp(36px,5vw,72px)}
.grid{display:grid;gap:var(--gap)}
.layout{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--gap)}
.layout__main,.layout__aside{min-width:0}
.panel{
  position:relative;
  padding:clamp(18px,2.4vw,32px);
  border:1px solid var(--c-line);
  border-radius:var(--r-lg);
  background:linear-gradient(165deg,rgba(11,27,51,.97),rgba(7,17,31,.93));
  box-shadow:var(--shadow-1);
  overflow:hidden;
}
.panel::before{
  content:"";position:absolute;inset:0 0 auto 0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(34,230,210,.6),transparent);
}
.panel__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:14px;margin-bottom:14px}
.panel__idx{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;color:var(--c-dim)}
.panel__title{font-size:clamp(1.15rem,1.8vw,1.5rem)}
.panel__body{color:var(--c-dim);font-size:15.5px;line-height:1.8}
.panel__body + .panel__body{margin-top:.9em}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:12px 22px;border:1px solid transparent;border-radius:var(--r-pill);
  font-family:var(--font-display);font-size:14.5px;font-weight:800;letter-spacing:.03em;
  text-decoration:none;cursor:pointer;
  transition:transform .22s var(--ease),box-shadow .24s var(--ease),
             background-color .24s var(--ease),border-color .24s var(--ease),color .24s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--signal{
  background:linear-gradient(135deg,var(--c-orange),#FF9B4D);
  color:#0A1420;
  box-shadow:0 14px 30px -16px rgba(255,122,26,.95);
}
.btn--signal:hover{box-shadow:0 18px 36px -14px rgba(255,122,26,.9)}
.btn--ghost{
  border-color:var(--c-line);color:var(--c-ink);
  background:rgba(30,58,95,.34);
}
.btn--ghost:hover{border-color:rgba(34,230,210,.6);color:var(--c-cyan)}
.btn--quiet{color:var(--c-dim);padding:10px 16px;font-weight:700}
.btn--quiet:hover{color:var(--c-cyan)}
.btn--block{width:100%}

/* ---------- 7. 标签 / 统计 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.5em;white-space:nowrap;
  padding:5px 12px;border:1px solid var(--c-line);border-radius:var(--r-pill);
  background:rgba(30,58,95,.28);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--c-dim);
}
.tag--cyan{color:var(--c-cyan);border-color:rgba(34,230,210,.45);background:rgba(34,230,210,.1)}
.tag--orange{color:var(--c-orange);border-color:rgba(255,122,26,.45);background:rgba(255,122,26,.1)}
.tag--purple{color:#B69CFF;border-color:rgba(139,92,246,.5);background:rgba(139,92,246,.14)}
.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(2.8rem,7vw,7rem);line-height:.92;letter-spacing:-.02em;
  background:linear-gradient(120deg,var(--c-cyan),var(--c-green) 56%,var(--c-purple));
  -webkit-background-clip:text;background-clip:text;
  color:transparent;-webkit-text-fill-color:transparent;
}
.stat__label{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--c-dim);
}

/* ---------- 8. 图片容器（页面阶段放置 img） ---------- */
.media{
  position:relative;display:block;width:100%;aspect-ratio:16/9;
  border:1px solid var(--c-line);border-radius:var(--r-md);overflow:hidden;
  background:
    radial-gradient(80% 120% at 18% 0%,rgba(34,230,210,.22),transparent 60%),
    radial-gradient(90% 120% at 92% 100%,rgba(139,92,246,.24),transparent 62%),
    linear-gradient(150deg,#0C1F3A,#071523);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(34,230,210,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,230,210,.07) 1px,transparent 1px);
  background-size:32px 32px;
}
.media__img{width:100%;height:100%;object-fit:cover}
.media__frame{position:absolute;inset:0;display:block}
.media__caption{
  position:absolute;left:14px;bottom:12px;z-index:2;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:rgba(230,241,255,.85);
}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}

/* ---------- 9. 面包屑 ---------- */
.crumbs{margin-bottom:clamp(14px,2vw,22px)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--c-dim)}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:var(--c-line)}
.crumbs a{color:var(--c-dim);transition:color .2s var(--ease)}
.crumbs a:hover{color:var(--c-cyan)}
.crumbs [aria-current="page"]{color:var(--c-ink)}

/* ---------- 10. 侧边轨道头部 ---------- */
.skip-link{
  position:absolute;left:14px;top:-120px;z-index:200;
  padding:10px 20px;border-radius:var(--r-pill);
  background:var(--c-cyan);color:#05131F;
  font-family:var(--font-display);font-weight:800;font-size:14px;
  transition:top .24s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{top:14px;outline:2px solid #05131F;outline-offset:2px}

.site-rail{
  position:fixed;top:0;left:0;bottom:0;z-index:120;
  width:var(--rail-w);
  display:flex;flex-direction:column;gap:20px;
  padding:20px 16px 18px;
  overflow:hidden;
  border-right:1px solid var(--c-line);
  background:linear-gradient(180deg,rgba(11,27,51,.98),rgba(7,17,31,.99));
  box-shadow:24px 0 60px -50px #000;
}
.site-rail::before{
  content:"";position:absolute;top:-120px;right:-140px;
  width:340px;height:340px;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,rgba(34,230,210,.2),transparent 62%);
}
.rail__progress{
  position:absolute;top:0;right:0;z-index:3;
  width:2px;height:100%;pointer-events:none;
  background:linear-gradient(180deg,var(--c-cyan),var(--c-purple) 62%,var(--c-orange));
  transform:scaleY(var(--progress,0));transform-origin:top;
  transition:transform .12s linear;
}
.rail__bar{
  position:relative;z-index:2;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.rail__brand{display:flex;align-items:center;gap:12px;min-width:0;color:var(--c-ink)}
.brand-mark{
  position:relative;flex:none;display:grid;place-items:center;
  width:44px;height:44px;border-radius:14px;
  background:conic-gradient(from 140deg,var(--c-cyan),var(--c-purple),var(--c-orange),var(--c-cyan));
  box-shadow:0 12px 26px -16px rgba(34,230,210,.95);
}
.brand-mark::before{
  content:"";position:absolute;inset:2px;border-radius:12px;
  background:linear-gradient(160deg,#0B1B33,#07111F);
}
.brand-mark__core{
  position:relative;z-index:1;
  font-family:var(--font-display);font-weight:900;font-size:20px;
  letter-spacing:.02em;color:var(--c-ink);
}
.brand-text{display:flex;flex-direction:column;min-width:0;line-height:1.18}
.brand-text__name{font-family:var(--font-display);font-weight:900;font-size:19px;letter-spacing:.04em}
.brand-text__tag{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--c-cyan);
}
.rail__toggle{
  display:none;flex:none;align-items:center;justify-content:center;
  width:44px;height:44px;border:1px solid var(--c-line);border-radius:12px;
  background:rgba(30,58,95,.4);color:var(--c-ink);
  transition:border-color .22s var(--ease),background-color .22s var(--ease);
}
.rail__toggle:hover{border-color:rgba(34,230,210,.6)}
.rail__toggle-lines{
  position:relative;display:block;width:18px;height:2px;border-radius:2px;
  background:var(--c-ink);
  transition:background-color .22s var(--ease);
}
.rail__toggle-lines::before,
.rail__toggle-lines::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;
  background:var(--c-ink);
  transition:transform .3s var(--ease);
}
.rail__toggle-lines::before{top:-6px}
.rail__toggle-lines::after{top:6px}
.rail__toggle[aria-expanded="true"] .rail__toggle-lines{background:transparent}
.rail__toggle[aria-expanded="true"] .rail__toggle-lines::before{transform:translateY(6px) rotate(45deg)}
.rail__toggle[aria-expanded="true"] .rail__toggle-lines::after{transform:translateY(-6px) rotate(-45deg)}

.rail__panel{
  position:relative;z-index:2;
  display:flex;flex-direction:column;gap:18px;
  flex:1;min-height:0;overflow-y:auto;
  padding-right:2px;
}
.rail__nav ul{display:flex;flex-direction:column;gap:4px}
.rail__nav a{
  position:relative;
  display:grid;grid-template-columns:26px minmax(0,1fr);align-items:center;gap:10px;
  padding:11px 12px;border:1px solid transparent;border-radius:var(--r-sm);
  color:var(--c-dim);
  transition:color .2s var(--ease),background-color .24s var(--ease),
             border-color .24s var(--ease),transform .24s var(--ease);
}
.rail__nav a::after{
  content:"";position:absolute;left:-1px;top:50%;
  width:2px;height:0;border-radius:2px;background:var(--c-cyan);
  transform:translateY(-50%);
  transition:height .28s var(--ease);
}
.rail__nav a:hover{
  color:var(--c-ink);
  background:rgba(30,58,95,.36);
  border-color:rgba(30,58,95,.95);
  transform:translateX(2px);
}
.rail__nav a[aria-current="page"]{
  color:var(--c-ink);
  background:linear-gradient(90deg,rgba(34,230,210,.17),rgba(34,230,210,.02));
  border-color:rgba(34,230,210,.42);
}
.rail__nav a[aria-current="page"]::after{height:56%}
.rail__nav a[aria-current="page"] .rail__idx{color:var(--c-cyan)}
.rail__idx{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;
  color:#4E6B8E;transition:color .2s var(--ease);
}
.rail__label{
  font-family:var(--font-display);font-weight:700;font-size:14px;
  line-height:1.35;letter-spacing:.02em;
}
.rail__meta{
  margin-top:auto;display:flex;flex-direction:column;gap:12px;
  padding-top:16px;border-top:1px solid rgba(30,58,95,.9);
}
.rail__status{
  display:flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--c-dim);
}
.rail__status::before{
  content:"";flex:none;width:7px;height:7px;border-radius:50%;
  background:var(--c-green);
  animation:railPulse 2.6s infinite;
}
@keyframes railPulse{
  0%{box-shadow:0 0 0 0 rgba(77,227,138,.55)}
  70%{box-shadow:0 0 0 9px rgba(77,227,138,0)}
  100%{box-shadow:0 0 0 0 rgba(77,227,138,0)}
}

/* ---------- 11. 页脚 ---------- */
.site-foot{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,7vw,96px);
  padding:clamp(36px,5vw,64px) 0 24px;
  border-top:1px solid rgba(30,58,95,.8);
  background:
    radial-gradient(circle at 88% 0%,rgba(139,92,246,.16),transparent 46%),
    radial-gradient(circle at 6% 100%,rgba(34,230,210,.12),transparent 44%),
    linear-gradient(180deg,#08152A,#050D18);
}
.site-foot::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-purple) 46%,var(--c-orange));
  opacity:.9;
}
.site-foot::after{
  content:"";position:absolute;top:-70px;left:-10%;
  width:120%;height:140px;pointer-events:none;opacity:.35;
  background:linear-gradient(90deg,transparent,rgba(34,230,210,.16),transparent);
  transform:rotate(-3deg);
}
.foot__wrap{position:relative;z-index:1;width:100%;max-width:var(--shell-max);margin-inline:auto;padding-inline:var(--pad)}
.foot__grid{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(24px,3.4vw,48px)}
.foot__brand{display:flex;flex-direction:column;gap:12px}
.foot__kicker{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--c-cyan);
}
.foot__lede{max-width:44ch;font-size:15px;line-height:1.8;color:var(--c-dim)}
.foot__hint{
  align-self:flex-start;
  padding:5px 12px;border:1px solid rgba(77,227,138,.45);border-radius:var(--r-pill);
  background:rgba(77,227,138,.1);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--c-green);
}
.foot__col{display:flex;flex-direction:column;gap:12px;min-width:0}
.foot__title{
  font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.2em;
  text-transform:uppercase;color:var(--c-dim);
}
.foot__title::after{
  content:"";display:block;width:28px;height:1px;margin-top:8px;
  background:linear-gradient(90deg,var(--c-cyan),transparent);
}
.foot__list{display:flex;flex-direction:column;gap:8px}
.foot__list a{
  display:inline-block;color:var(--c-ink);font-size:14.5px;
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.foot__list a:hover{color:var(--c-cyan);transform:translateX(3px)}
.foot__contact{gap:10px}
.foot__item{display:grid;grid-template-columns:46px minmax(0,1fr);gap:10px;align-items:baseline}
.foot__item-key{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--c-dim);
}
.foot__item-val{color:var(--c-ink);font-size:14.5px;word-break:break-word}
.foot__note{font-size:13px;line-height:1.7;color:var(--c-dim);max-width:38ch}
.foot__copy{
  align-self:flex-start;margin-top:4px;
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border:1px dashed rgba(34,230,210,.5);border-radius:var(--r-pill);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--c-cyan);
  transition:background-color .22s var(--ease),border-color .22s var(--ease),color .22s var(--ease);
}
.foot__copy:hover{background:rgba(34,230,210,.1);border-style:solid}
.foot__copy.is-copied{
  border-color:rgba(77,227,138,.7);border-style:solid;
  background:rgba(77,227,138,.12);color:var(--c-green);
}
.foot__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px 24px;margin-top:clamp(28px,4vw,48px);padding-top:18px;
  border-top:1px solid rgba(30,58,95,.7);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--c-dim);
}
.foot__legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.foot__legal a{color:var(--c-dim);transition:color .2s var(--ease)}
.foot__legal a:hover{color:var(--c-cyan)}
.foot__meta{color:var(--c-dim)}
.foot__icp{color:var(--c-dim)}
.foot__top{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 16px;border:1px solid var(--c-line);border-radius:var(--r-pill);
  background:rgba(30,58,95,.3);color:var(--c-ink);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  transition:border-color .22s var(--ease),color .22s var(--ease),background-color .22s var(--ease);
}
.foot__top:hover{border-color:rgba(34,230,210,.6);color:var(--c-cyan);background:rgba(34,230,210,.08)}

/* ---------- 12. 进场显现 ---------- */
.reveal{transition:opacity .6s var(--ease),transform .6s var(--ease)}
html.js .reveal{opacity:0;transform:translateY(18px)}
html.js .reveal.is-visible{opacity:1;transform:none}

/* ---------- 13. 响应式 ---------- */
@media (min-width:720px){
  .foot__grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .foot__brand{grid-column:1 / -1}
}
@media (min-width:900px){
  .layout{grid-template-columns:minmax(0,7fr) minmax(0,4fr);align-items:start}
  .layout--rev{grid-template-columns:minmax(0,4fr) minmax(0,7fr)}
}
@media (min-width:1024px){
  .foot__grid{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr) minmax(0,1.35fr)}
  .foot__brand{grid-column:auto}
}
@media (max-width:1023px){
  body{padding-left:0;padding-top:var(--topbar-h);background-attachment:scroll}
  .site-rail{
    top:0;right:0;bottom:auto;left:0;
    width:100%;height:var(--topbar-h);
    flex-direction:row;align-items:center;gap:0;
    padding:0 14px;
    border-right:0;border-bottom:1px solid var(--c-line);
    box-shadow:0 18px 40px -34px #000;
  }
  .site-rail::before{display:none}
  .rail__bar{width:100%}
  .rail__toggle{display:inline-flex}
  .rail__progress{
    top:auto;bottom:-1px;left:0;right:auto;
    width:100%;height:2px;
    transform:scaleX(var(--progress,0));transform-origin:left;
  }
  .rail__panel{
    position:fixed;left:0;right:0;top:var(--topbar-h);
    max-height:calc(100dvh - var(--topbar-h));
    overflow-y:auto;-webkit-overflow-scrolling:touch;
    padding:16px 16px 26px;
    border-bottom:1px solid var(--c-line);
    border-radius:0 0 var(--r-lg) var(--r-lg);
    background:linear-gradient(180deg,#0B1B33,#08152A);
    box-shadow:0 32px 70px -34px #000;
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-12px);
    transition:opacity .26s var(--ease),transform .3s var(--ease),visibility .26s;
    z-index:110;
  }
  .site-rail[data-open] .rail__panel,
  .rail__panel[data-open]{
    opacity:1;visibility:visible;pointer-events:auto;transform:none;
  }
  .rail__meta{margin-top:8px}
  .rail__nav a{padding:13px 12px}
  .rail__label{font-size:15px}
  #main-content{scroll-margin-top:calc(var(--topbar-h) + 16px)}
}
@media (max-width:519px){
  .foot__bottom{flex-direction:column;align-items:flex-start}
  .brand-text__tag{letter-spacing:.12em}
}

/* ---------- 14. 减少动态 ---------- */
@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 !important;transform:none !important}
  .rail__progress{transition:none}
  .rail__status::before{animation:none}
}