/* ==========================================================================
   米博体育中心 · 共享站点样式 /assets/site.css
   夜场墨绿底 + 荧光青数据线 + 暖橙信号点
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#071512;
  --ink-2:#0C2A24;
  --moss:#2F5D4B;
  --stone:#8C9490;
  --bone:#F1EEE4;
  --clay:#B5623C;
  --cyan:#35F0C8;
  --cyan-dim:#12B99A;
  --orange:#FF7A3D;
  --orange-soft:#FFC9A8;
  --data-gray:#4A6B60;

  --line-cyan:rgba(53,240,200,.18);
  --line-cyan-strong:rgba(53,240,200,.42);
  --line-soft:rgba(241,238,228,.12);
  --text-soft:rgba(241,238,228,.78);
  --text-mute:rgba(241,238,228,.62);
  --ink-text-soft:rgba(7,21,18,.8);

  --font-display:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",system-ui,sans-serif;
  --font-serif:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-body:"PingFang SC","Noto Sans SC","Microsoft YaHei",-apple-system,"Segoe UI",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --content-w:1320px;
  --gap:32px;
  --radius-card:20px 20px 20px 4px;
  --radius-soft:16px 16px 16px 3px;
  --header-h:74px;
}

/* ---------- 2. 重置与基础排版 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}
body{
  margin:0;
  background-color:var(--ink);
  color:var(--bone);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body.nav-open{overflow:hidden}
h1,h2,h3,h4,h5{margin:0;font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;line-height:1.12}
p{margin:0 0 1.2em}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
hr{border:0;height:1px;background:var(--line-cyan);margin:0}
::selection{background:var(--cyan);color:var(--ink)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}

/* ---------- 3. 文字层级 ---------- */
.display-1{font-size:clamp(38px,7vw,88px);line-height:.98;letter-spacing:-.03em}
.display-2{font-size:clamp(30px,4.6vw,56px);line-height:1.04}
.display-3{font-size:clamp(24px,2.6vw,34px);line-height:1.14}
.kicker{
  display:inline-flex;align-items:center;gap:12px;
  font-family:var(--font-serif);font-size:16px;font-weight:600;
  letter-spacing:.14em;color:var(--cyan);
}
.kicker::before{content:"";width:34px;height:1px;background:currentColor;opacity:.7}
.lede{font-size:clamp(17px,1.4vw,20px);line-height:1.8;color:var(--text-soft);max-width:62ch}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.serif{font-family:var(--font-serif);letter-spacing:.04em}
.prose{max-width:68ch;font-size:17px;line-height:1.9;color:var(--text-soft)}
.prose p{margin-bottom:1.15em}
.prose ul{list-style:disc;padding-left:1.25em;margin-bottom:1.2em}
.prose ol{list-style:decimal;padding-left:1.25em;margin-bottom:1.2em}
.prose li{margin-bottom:.45em}
.prose a{color:var(--cyan);border-bottom:1px solid var(--line-cyan-strong)}
.prose a:hover{border-bottom-color:var(--cyan)}

/* ---------- 4. 容器、分区、栅格 ---------- */
.container{width:min(var(--content-w),100% - 48px);margin-inline:auto}
.section{padding-block:clamp(64px,8vw,112px)}
.section--tight{padding-block:clamp(40px,5vw,64px)}
.section--bone{background-color:var(--bone);color:var(--ink)}
.section--bone .lede,
.section--bone .prose{color:var(--ink-text-soft)}
.section--bone .kicker{color:var(--clay)}
.section--bone .rule{background:rgba(7,21,18,.16)}
.section--bone .prose a{color:#0B6B57;border-bottom-color:rgba(11,107,87,.5)}
.rule{height:1px;background:var(--line-cyan);margin:0}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.span-1{grid-column:span 1}
.span-2{grid-column:span 2}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-10{grid-column:span 10}
.span-11{grid-column:span 11}
.span-12{grid-column:span 12}
.start-2{grid-column-start:2}
.start-3{grid-column-start:3}
.start-4{grid-column-start:4}

/* ---------- 5. 按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  min-height:44px;padding:11px 22px;border-radius:999px;
  font-family:var(--font-body);font-size:15px;font-weight:600;letter-spacing:.02em;
  line-height:1;border:1px solid transparent;cursor:pointer;
  transition:background-color .25s ease,color .25s ease,border-color .25s ease,transform .25s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--signal{background-color:var(--orange);color:#20100A}
.btn--signal:hover{background-color:#FF9160}
.btn--ghost{border-color:var(--line-cyan-strong);color:var(--cyan);background-color:rgba(53,240,200,.06)}
.btn--ghost:hover{background-color:rgba(53,240,200,.14)}
.btn--bone{background-color:var(--bone);color:var(--ink)}
.btn--bone:hover{background-color:#FFFFFF}
.btn--ink{background-color:var(--ink);color:var(--bone)}
.btn--ink:hover{background-color:var(--ink-2)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:999px;
  font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.06em;
  border:1px solid var(--line-cyan-strong);color:var(--cyan);background-color:rgba(53,240,200,.08);
}
.tag--signal{border-color:rgba(255,122,61,.5);color:var(--orange);background-color:rgba(255,122,61,.12)}
.tag--clay{border-color:rgba(181,98,60,.55);color:var(--orange-soft);background-color:rgba(181,98,60,.2)}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb{padding-block:10px 0}
.breadcrumb__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--stone);
}
.breadcrumb__list li+li::before{content:"/";margin-right:8px;color:rgba(140,148,144,.55)}
.breadcrumb__list a{color:var(--stone);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.breadcrumb__list a:hover{color:var(--cyan);border-bottom-color:var(--line-cyan-strong)}
.breadcrumb__list [aria-current="page"]{color:var(--bone)}

/* ---------- 7. 页头 ---------- */
.skip-link{
  position:absolute;top:10px;left:16px;z-index:6;
  transform:translateY(-220%);
  padding:10px 16px;border-radius:8px;
  background-color:var(--cyan);color:var(--ink);
  font-size:14px;font-weight:700;line-height:1;
  transition:transform .2s ease;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

.site-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  background-image:linear-gradient(180deg,rgba(7,21,18,.8),rgba(7,21,18,0));
  transition:background-color .4s ease,box-shadow .4s ease;
}
.site-header.is-scrolled{
  background-color:rgba(7,21,18,.97);
  background-image:none;
  box-shadow:0 1px 0 var(--line-cyan),0 22px 44px -34px rgba(0,0,0,.95);
}
.site-header__inner{
  position:relative;z-index:3;
  display:flex;align-items:center;gap:clamp(14px,2vw,32px);
  min-height:var(--header-h);
  padding-block:14px;
  transition:min-height .3s ease,padding .3s ease;
}
.site-header.is-scrolled .site-header__inner{min-height:58px;padding-block:8px}

.site-header__brand{display:flex;align-items:center;gap:12px;flex:none}
.brand-mark{
  position:relative;flex:none;width:30px;height:30px;
  border:2px solid var(--cyan);
  border-radius:8px 8px 8px 2px;
  background-image:linear-gradient(135deg,rgba(53,240,200,.3),rgba(53,240,200,0) 62%);
}
.brand-mark::after{
  content:"";position:absolute;right:5px;bottom:5px;width:10px;height:10px;
  border-right:2px solid var(--orange);border-bottom:2px solid var(--orange);
}
.brand-mark--lg{width:40px;height:40px;border-radius:12px 12px 12px 3px}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font-family:var(--font-display);font-size:17px;font-weight:800;letter-spacing:-.01em;color:var(--bone)}
.brand-line{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--stone)}

.site-nav{margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:clamp(8px,1.5vw,26px)}
.site-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:7px;
  padding:10px 2px;font-size:15px;font-weight:500;color:var(--text-soft);
  transition:color .25s ease;
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:2px;
  background-color:var(--cyan);transform:scaleX(0);transform-origin:left center;
  transition:transform .3s ease;
}
.site-nav__link:hover,
.site-nav__link:focus-visible{color:var(--bone)}
.site-nav__link:hover::after{transform:scaleX(.5)}
.site-nav__link[aria-current="page"]{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav-index{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.08em;color:var(--cyan-dim)}

.site-header__actions{display:flex;align-items:center;gap:12px;flex:none}
.site-header__actions .btn{padding:11px 20px}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  min-height:44px;min-width:44px;padding:10px 12px;
  border:1px solid var(--line-cyan-strong);border-radius:10px;
  color:var(--bone);font-size:13px;font-weight:600;line-height:1;cursor:pointer;
  transition:border-color .25s ease,background-color .25s ease;
}
.nav-toggle:hover{background-color:rgba(53,240,200,.1)}
.nav-toggle__text{white-space:nowrap}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:2px;width:100%;background-color:var(--cyan);transition:transform .3s ease,opacity .2s ease}
.site-header[data-open] .nav-toggle__bars span:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:last-child{transform:translateY(-3px) rotate(-45deg)}

.site-header__scrim{
  display:none;position:fixed;inset:0;z-index:-1;
  background-color:rgba(4,12,10,.66);
  opacity:0;pointer-events:none;
  transition:opacity .3s ease;
}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background-image:linear-gradient(90deg,var(--cyan),var(--orange));
  transform:scaleX(var(--progress,0));transform-origin:left center;
}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  background-color:var(--ink-2);
  color:var(--text-soft);
  border-top:1px solid var(--line-cyan);
  overflow:hidden;
}
.footer-pitch{
  height:76px;
  border-bottom:1px solid rgba(53,240,200,.12);
  background-image:
    repeating-linear-gradient(90deg,rgba(53,240,200,.16) 0 1px,transparent 1px 64px),
    repeating-linear-gradient(0deg,rgba(53,240,200,.16) 0 1px,transparent 1px 38px);
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 16%,#000 84%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 16%,#000 84%,transparent);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(230px,1.5fr) repeat(3,minmax(128px,1fr)) minmax(220px,1.35fr);
  gap:clamp(24px,3vw,48px);
  padding-block:clamp(44px,5vw,72px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer-brand__name{margin:0;font-family:var(--font-display);font-size:20px;font-weight:800;letter-spacing:-.01em;color:var(--bone)}
.footer-brand__line{margin:0;font-family:var(--font-serif);font-size:16px;letter-spacing:.06em;color:var(--cyan)}
.footer-brand__meta{margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--stone)}
.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-serif);font-size:16px;font-weight:600;letter-spacing:.1em;
  color:var(--bone);
}
.footer-col__list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-block;min-height:24px;
  font-size:15px;color:var(--text-soft);
  border-bottom:1px solid transparent;
  transition:color .25s ease,border-color .25s ease;
}
.footer-link:hover,
.footer-link:focus-visible{color:var(--cyan);border-bottom-color:var(--line-cyan-strong)}
.footer-link[aria-current="page"]{color:var(--cyan)}
.footer-contact__list{display:flex;flex-direction:column;gap:10px;font-size:14px;line-height:1.7;color:var(--text-mute)}
.footer-contact__list li{display:flex;gap:10px}
.footer-contact__key{
  flex:none;padding-top:3px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--stone);
}
.footer-note{
  margin:16px 0 0;padding-top:14px;
  border-top:1px solid var(--line-soft);
  font-size:13px;line-height:1.7;color:var(--stone);
}
.footer-bottom{background-color:rgba(7,21,18,.55);border-top:1px solid var(--line-soft)}
.footer-bottom__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 28px;padding-block:20px;
  font-size:13px;color:var(--stone);
}
.footer-year{margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px}
.footer-legal__item{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em}
.footer-legal__item .footer-link{font-family:var(--font-mono);font-size:12px}

/* ---------- 9. 基础组件：研究板 / 指标 / 图片容器 ---------- */
.board{
  position:relative;overflow:hidden;
  padding:clamp(20px,3vw,32px);
  border:1px solid var(--line-cyan);
  border-radius:var(--radius-card);
  background-image:linear-gradient(180deg,rgba(12,42,36,.92),rgba(7,21,18,.92));
}
.board::before{content:"";position:absolute;top:0;left:0;width:52px;height:3px;background-color:var(--orange)}
.board__head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:14px}
.board__title{margin:0;font-family:var(--font-serif);font-size:20px;font-weight:600;letter-spacing:.06em;color:var(--bone)}
.board__summary{margin:0 0 16px;font-size:16px;line-height:1.85;color:var(--text-soft)}
.board__bounds{
  margin:0;padding-left:14px;
  border-left:2px solid var(--stone);
  font-size:14px;line-height:1.75;color:var(--stone);
}
.board__terms{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.section--bone .board{background-image:none;background-color:#FFFFFF;border-color:rgba(7,21,18,.12)}
.section--bone .board__title{color:var(--ink)}
.section--bone .board__summary{color:var(--ink-text-soft)}

.metric-card{
  display:flex;flex-direction:column;gap:8px;
  padding:20px 22px;
  background-color:var(--ink-2);
  border:1px solid rgba(53,240,200,.14);
  border-radius:var(--radius-soft);
}
.metric-card__label{font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.1em;color:var(--stone)}
.metric-card__value{
  font-family:var(--font-display);font-size:clamp(30px,4vw,44px);font-weight:800;line-height:1;
  letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--cyan);
}
.metric-card__note{font-size:13px;line-height:1.7;color:var(--stone)}
.metric-card--signal .metric-card__value{color:var(--orange)}
.section--bone .metric-card{background-color:#FFFFFF;border-color:rgba(7,21,18,.12)}
.section--bone .metric-card__value{color:#0B6B57}
.section--bone .metric-card--signal .metric-card__value{color:var(--clay)}

.media-frame{
  position:relative;overflow:hidden;isolation:isolate;
  border:1px solid var(--line-cyan);
  border-radius:var(--radius-card);
  background-image:linear-gradient(155deg,var(--moss),var(--ink-2) 72%);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(241,238,228,.06) 0 1px,transparent 1px 30px),
    repeating-linear-gradient(90deg,rgba(241,238,228,.06) 0 1px,transparent 1px 30px);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--pitch{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame--heat{aspect-ratio:21/9}
.media-frame__label{
  position:absolute;left:16px;top:16px;z-index:2;
  padding:5px 12px;border-radius:999px;
  background-color:rgba(7,21,18,.7);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--cyan);
}
.media-frame__caption{
  margin-top:12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--stone);
}

/* ---------- 10. 动效与显现 ---------- */
html.js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .28s ease-out,transform .3s ease-out;
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 11. 响应式 ---------- */
@media (max-width:1200px){
  .container{width:min(var(--content-w),100% - 40px)}
  .footer-top{grid-template-columns:minmax(220px,1.4fr) repeat(2,minmax(0,1fr)) minmax(210px,1.2fr)}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:992px){
  .container{width:calc(100% - 40px)}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));gap:24px}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-10,.span-11,.span-12{grid-column:span 6}
  .span-3{grid-column:span 3}
  .span-2{grid-column:span 2}
  .start-2,.start-3,.start-4{grid-column-start:auto}

  .brand-line{display:none}
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand,.footer-contact{grid-column:1/-1}

  .nav-toggle{display:inline-flex}
  .site-header__scrim{display:block}
  .site-header[data-open] .site-header__scrim{opacity:1;pointer-events:auto}

  .site-nav{
    position:fixed;top:0;right:0;bottom:0;z-index:2;
    width:min(88vw,380px);
    margin-left:0;
    padding:96px 26px 40px;
    overflow-y:auto;
    background-color:var(--ink-2);
    border-left:1px solid var(--line-cyan);
    box-shadow:-40px 0 70px -46px #000;
    transform:translateX(102%);
    transition:transform .38s cubic-bezier(.22,.74,.2,1);
  }
  .site-header[data-open] .site-nav{transform:none}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{border-bottom:1px solid var(--line-soft)}
  .site-nav__link{
    display:flex;align-items:baseline;gap:12px;
    padding:18px 2px;
    font-family:var(--font-display);font-size:22px;font-weight:800;letter-spacing:-.01em;
    color:var(--bone);
  }
  .site-nav__link::after{display:none}
  .site-nav__link:hover,
  .site-nav__link[aria-current="page"]{color:var(--cyan)}
  .nav-index{font-size:12px}
}
@media (max-width:640px){
  body{font-size:16px}
  .container{width:calc(100% - 32px)}
  .grid-12{grid-template-columns:minmax(0,1fr);gap:20px}
  .span-1,.span-2,.span-3,.span-4,.span-5,.span-6,
  .span-7,.span-8,.span-9,.span-10,.span-11,.span-12{grid-column:1/-1}
  .footer-top{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-brand,.footer-contact{grid-column:auto}
  .footer-bottom__inner{justify-content:flex-start}
  .site-header__actions .btn{padding:10px 14px;font-size:13px}
  .brand-mark{width:26px;height:26px}
  .nav-toggle__text{display:none}
}

/* ---------- 12. 可访问性：减少动态 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.12s !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
}