/* 开云体育 - 共享样式系统
   无障碍观赛控制台 + 体育场导航图 + 辅助科技研究档案
   仅供 index.html / accessibility.html / parasports.html / viewing.html / ai.html / research.html / app.html / download.html 共用
   页面若需要额外样式，请在该页面 <head> 内使用局部 <style> 补充，不要修改本文件的规则名。

   本站主题是体育无障碍科技，因此本文件本身必须提供基础可访问性支持：
   可见焦点样式、跳转链接、足够对比度、不依赖颜色单独表达状态、
   尊重 prefers-reduced-motion。 */

:root{
  --ink: #1f2733;
  --ink-soft: #4d5563;
  --paper: #f6f4ef;
  --paper-raised: #fffefb;
  --line: #ded9cd;
  --line-strong: #bdb6a4;
  --a11y-blue: #1f5c9e;
  --a11y-blue-bg: #e2ecf6;
  --nav-green: #2f7a4f;
  --nav-green-bg: #e3efe6;
  --alert-orange: #b5651d;
  --alert-orange-bg: #f5e7d8;
  --assist-purple: #6a4e8c;
  --assist-purple-bg: #ece5f2;
  --warn-red: #9c3d33;
  --warn-red-bg: #f6e6e3;
  --focus-ring: #b5651d;
  --radius: 6px;
  --max-w: 1220px;
  --font: "PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:0.001ms !important;animation-iteration-count:1 !important;transition-duration:0.001ms !important;}
}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--paper);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block;}
a{color:var(--a11y-blue);text-decoration:underline;text-underline-offset:2px;}
a:hover{color:#164a80;}
h1,h2,h3,h4{color:var(--ink);line-height:1.35;font-weight:700;margin:0 0 .6em;}
h1{font-size:1.9rem;}
h2{font-size:1.4rem;margin-top:2.2em;padding-top:.2em;}
h3{font-size:1.15rem;margin-top:1.6em;}
p{margin:0 0 1em;}
ul,ol{margin:0 0 1em;padding-left:1.4em;}
table{border-collapse:collapse;width:100%;margin:1em 0;font-size:.95rem;}
.wrap{max-width:var(--max-w);margin:0 auto;padding:0 20px;}

/* ---------- Accessibility baseline ---------- */
.skip-link{
  position:absolute;left:12px;top:-60px;background:var(--ink);color:#fff;padding:10px 16px;
  border-radius:var(--radius);z-index:100;transition:top .15s ease;text-decoration:none;font-weight:600;
}
.skip-link:focus{top:12px;}
:focus-visible{outline:3px solid var(--focus-ring);outline-offset:2px;}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{
  outline:3px solid var(--focus-ring);outline-offset:2px;border-radius:3px;
}
.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0;
}

/* ---------- Header / Nav ---------- */
.site-header{
  background:var(--paper-raised);
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:40;
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.05rem;color:var(--ink);text-decoration:none;}
.brand img{height:32px;width:32px;}
.brand:hover{text-decoration:underline;}
.main-nav{display:flex;gap:2px;}
.main-nav a{
  padding:10px 14px;border-radius:var(--radius);color:var(--ink-soft);font-size:.95rem;white-space:nowrap;
  text-decoration:none;
}
.main-nav a:hover{background:var(--a11y-blue-bg);color:var(--ink);}
.main-nav a[aria-current="page"]{background:var(--ink);color:#fff;font-weight:600;}
.nav-toggle{
  display:none;background:none;border:1px solid var(--line-strong);border-radius:var(--radius);
  padding:8px 10px;font-size:1.1rem;cursor:pointer;color:var(--ink);
}
@media (max-width:900px){
  .main-nav{
    display:none;position:absolute;left:0;right:0;top:64px;background:var(--paper-raised);
    flex-direction:column;border-bottom:1px solid var(--line);padding:8px 20px 16px;
  }
  .main-nav.is-open{display:flex;}
  .main-nav a{padding:12px 6px;border-bottom:1px solid var(--line);border-radius:0;}
  .nav-toggle{display:inline-block;}
}

/* ---------- Breadcrumb ---------- */
.breadcrumb{font-size:.85rem;color:var(--ink-soft);padding:14px 0 0;}
.breadcrumb a{color:var(--ink-soft);}
.breadcrumb .sep{margin:0 6px;color:var(--line-strong);}

/* ---------- Hero ---------- */
.hero{display:flex;gap:40px;align-items:center;padding:32px 0 20px;flex-wrap:wrap;}
.hero-text{flex:1 1 480px;min-width:280px;}
.hero-text h1{font-size:1.75rem;}
.hero-media{flex:0 0 440px;max-width:460px;}
.hero .lede{font-size:1.05rem;color:var(--ink-soft);}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px;}
.btn{
  display:inline-block;padding:10px 18px;border-radius:var(--radius);font-size:.92rem;font-weight:600;
  border:1px solid var(--ink);color:var(--ink);background:transparent;text-decoration:none;
}
.btn:hover{background:var(--ink);color:#fff;}
.btn-solid{background:var(--ink);color:#fff;}
.btn-solid:hover{background:#000;}

/* ---------- Section rhythm ---------- */
main{display:block;padding-bottom:60px;}
.section{padding:26px 0;border-top:1px solid var(--line);}
.section:first-of-type{border-top:none;}
.section-kicker{
  text-transform:uppercase;letter-spacing:.06em;font-size:.78rem;color:var(--ink-soft);
  font-weight:700;margin-bottom:6px;
}

/* ---------- Editorial callout ---------- */
.editorial-block{
  background:var(--paper-raised);border-left:4px solid var(--nav-green);
  border-radius:0 var(--radius) var(--radius) 0;padding:20px 24px;margin:1.2em 0;
}
.editorial-block h3{margin-top:0;}
.core-quote{
  font-size:1.15rem;font-weight:700;color:var(--ink);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:16px 0;margin:1.4em 0;
}
.safety-notice{
  background:var(--warn-red-bg);border:1px solid #e0c3bd;border-radius:var(--radius);
  padding:16px 20px;margin:1.2em 0;color:#5c2820;
}
.safety-notice strong{color:var(--warn-red);}
.source-note{
  font-size:.85rem;color:var(--ink-soft);background:var(--paper-raised);
  border:1px dashed var(--line-strong);border-radius:var(--radius);padding:12px 16px;margin:1em 0;
}
.source-note a{word-break:break-all;}

/* ---------- Four-channel / spectrum grid ---------- */
.channel-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:1.4em 0;}
.channel-card{background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);padding:16px;}
.channel-card img{margin-bottom:10px;}
.channel-card h4{margin:0 0 6px;font-size:1rem;}
.channel-card p{margin:0;font-size:.9rem;color:var(--ink-soft);}
@media (max-width:900px){.channel-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.channel-grid{grid-template-columns:1fr;}}

/* Alias used by some pages */
.evidence-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:1.4em 0;}
.evidence-card{background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);padding:16px;}
.evidence-card img{margin-bottom:10px;}
.evidence-card h4{margin:0 0 6px;font-size:1rem;}
.evidence-card p{margin:0;font-size:.9rem;color:var(--ink-soft);}
@media (max-width:900px){.evidence-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.evidence-grid{grid-template-columns:1fr;}}

/* ---------- Timeline / caption timeline ---------- */
.caption-timeline{display:flex;gap:2px;margin:1.2em 0;overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--ink);padding:10px;}
.caption-marker{
  flex:0 0 auto;background:#fff;color:var(--ink);border-radius:4px;padding:8px 12px;font-size:.78rem;
  min-width:120px;
}
.caption-marker time{display:block;font-weight:700;color:var(--a11y-blue);margin-bottom:3px;}

/* ---------- Chips / tags ---------- */
.chip{display:inline-block;padding:2px 10px;border-radius:20px;font-size:.75rem;margin:2px 4px 2px 0;font-weight:600;}
.chip-blue{background:var(--a11y-blue-bg);color:var(--a11y-blue);}
.chip-green{background:var(--nav-green-bg);color:var(--nav-green);}
.chip-orange{background:var(--alert-orange-bg);color:var(--alert-orange);}
.chip-purple{background:var(--assist-purple-bg);color:var(--assist-purple);}
.chip-red{background:var(--warn-red-bg);color:var(--warn-red);}

/* ---------- Comparison columns / table ---------- */
.compare-columns{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:1.2em 0;}
.compare-col{border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;background:var(--paper-raised);}
.compare-col h4{margin-top:0;}
@media (max-width:700px){.compare-columns{grid-template-columns:1fr;}}
.data-table{overflow-x:auto;display:block;}
.data-table th,.data-table td{border:1px solid var(--line);padding:10px 12px;text-align:left;}
.data-table th{background:var(--paper-raised);}

/* ---------- Route / pipeline flow ---------- */
.flow-steps{list-style:none;padding:0;margin:1.2em 0;display:flex;flex-direction:column;gap:0;}
.flow-steps li{
  position:relative;padding:12px 16px 12px 40px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--paper-raised);margin-bottom:8px;
}
.flow-steps li::before{
  content:counter(flow-count);counter-increment:flow-count;
  position:absolute;left:10px;top:50%;transform:translateY(-50%);
  width:20px;height:20px;border-radius:50%;background:var(--a11y-blue);color:#fff;
  font-size:.75rem;font-weight:700;display:flex;align-items:center;justify-content:center;
}
.flow-steps{counter-reset:flow-count;}

/* ---------- Article grid / cards ---------- */
.filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 16px;}
.filter-bar button{
  background:var(--paper-raised);border:1px solid var(--line-strong);border-radius:20px;
  padding:6px 14px;font-size:.85rem;cursor:pointer;color:var(--ink-soft);
}
.filter-bar button[aria-pressed="true"]{background:var(--ink);color:#fff;border-color:var(--ink);}
.article-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin:1.2em 0;}
.article-card{
  background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px;display:flex;flex-direction:column;
}
.article-card img{border-radius:4px;margin-bottom:10px;}
.article-card time{font-size:.78rem;color:var(--ink-soft);}
.article-card .tag{font-size:.75rem;color:var(--a11y-blue);font-weight:600;margin-left:8px;}
.article-card h3{font-size:1.02rem;margin:8px 0 6px;}
.article-card .summary{font-size:.88rem;color:var(--ink-soft);}
.article-card .preview{font-size:.86rem;color:var(--ink-soft);border-top:1px dashed var(--line);padding-top:8px;margin-top:auto;}
.article-card .read-more{display:inline-block;margin-top:10px;font-weight:600;font-size:.88rem;}
@media (max-width:800px){.article-grid{grid-template-columns:1fr;}}

/* ---------- Timeline (viewing.html article index) ---------- */
.timeline{list-style:none;padding:0;margin:1.2em 0;border-left:2px solid var(--line-strong);}
.timeline li{position:relative;padding:0 0 16px 22px;}
.timeline li::before{
  content:"";position:absolute;left:-6px;top:5px;width:10px;height:10px;border-radius:50%;
  background:var(--nav-green);
}
.timeline time{font-size:.8rem;color:var(--ink-soft);display:block;}
.timeline a{font-weight:600;}

/* ---------- Full article ---------- */
.article-full{border-top:1px solid var(--line);padding-top:28px;margin-top:34px;}
.article-full:first-of-type{margin-top:0;}
.article-meta{
  display:flex;flex-wrap:wrap;gap:6px 16px;font-size:.82rem;color:var(--ink-soft);
  background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);
  padding:10px 14px;margin:10px 0 18px;
}
.article-meta span strong{color:var(--ink);}

/* ---------- FAQ ---------- */
.faq-list{margin:1.2em 0;}
.faq-list details{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-raised);
  padding:12px 16px;margin-bottom:10px;
}
.faq-list summary{font-weight:600;cursor:pointer;list-style:none;position:relative;padding-right:24px;}
.faq-list summary::-webkit-details-marker{display:none;}
.faq-list summary::after{content:"+";position:absolute;right:0;top:0;font-size:1.2rem;color:var(--ink-soft);}
.faq-list details[open] summary::after{content:"–";}
.faq-list p{margin:10px 0 0;color:var(--ink-soft);}

/* ---------- Company / footer ---------- */
.company-box{
  background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 24px;margin:1.2em 0;
}
.company-box dl{display:grid;grid-template-columns:120px 1fr;gap:6px 12px;font-size:.9rem;margin:12px 0 0;}
.company-box dt{color:var(--ink-soft);}
.company-box dd{margin:0;}

.site-footer{background:var(--ink);color:#d8dae0;margin-top:40px;}
.site-footer .wrap{padding:36px 20px 26px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:26px;}
.footer-grid h4{color:#fff;font-size:.95rem;margin-bottom:10px;}
.site-footer a{color:#c3c8d4;}
.site-footer .brand-line{color:#fff;font-weight:700;font-size:1.1rem;margin-bottom:6px;}
.footer-tagline{color:#9aa0af;font-size:.85rem;margin-bottom:16px;}
.footer-nav-list{list-style:none;padding:0;margin:0;}
.footer-nav-list li{margin-bottom:6px;}
.footer-bottom{
  border-top:1px solid #333a48;margin-top:22px;padding-top:16px;font-size:.8rem;color:#868da0;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:6px;
}
@media (max-width:800px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:520px){.footer-grid{grid-template-columns:1fr;}}

/* ---------- Back to top ---------- */
.back-to-top{
  position:fixed;right:20px;bottom:20px;width:42px;height:42px;border-radius:50%;
  background:var(--ink);color:#fff;border:none;font-size:1.1rem;cursor:pointer;display:none;
  align-items:center;justify-content:center;box-shadow:0 2px 8px rgba(0,0,0,.25);z-index:50;
}
.back-to-top.is-visible{display:flex;}

/* ---------- Misc ---------- */
.tag-label{display:inline-block;background:var(--a11y-blue-bg);color:var(--a11y-blue);font-size:.78rem;padding:2px 10px;border-radius:20px;font-weight:600;}
.small-note{font-size:.82rem;color:var(--ink-soft);}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
@media (max-width:800px){.two-col{grid-template-columns:1fr;}}

/* Responsive breakpoints per spec: 1440 / 1200 / 768 / 430 / 390 / 360 */
@media (max-width:430px){
  .hero{padding:22px 0 14px;}
  h1{font-size:1.5rem;}
  h2{font-size:1.2rem;}
}
