/* ============================================================
   雅博体育主站 · /assets/site.css
   共享外壳：变量 / reset / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --deep:#08131F;
  --panel:#0E2136;
  --rock:#2E3742;
  --paper:#F2EFE6;
  --mist:#C7D3DC;
  --moss:#5F7A6A;
  --clay:#C0704B;
  --cyan:#35F0D0;
  --orange:#FF8A2B;
  --magenta:#E0467C;
  --ink:#05090F;

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-num:"Oswald","Barlow Condensed","Arial Narrow","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-body:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun","Times New Roman",Georgia,serif;

  --border:1px solid var(--rock);
  --maxw:1460px;
  --gutter:clamp(18px,3vw,44px);
  --radius:2px;
  --header-h:74px;
  --header-h-condensed:56px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{
  margin:0;
  background:var(--deep);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}
img,svg,video,canvas{max-width:100%;height:auto}
img,video{display:block}
button{font:inherit;color:inherit}
input,select,textarea{font:inherit}
ul,ol{margin:0;padding:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
a{color:inherit}
main{display:block}
#main-content{scroll-margin-top:calc(var(--header-h-condensed) + 12px)}
::selection{background:var(--cyan);color:#04211b}

/* ---------- 3. 中文排版与焦点 ---------- */
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.25;
  letter-spacing:.01em;
  color:var(--paper);
}
strong{font-weight:700}
:focus{outline:none}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:var(--radius)}

.visually-hidden{
  position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.skip-link{
  position:fixed;top:8px;left:8px;z-index:200;
  transform:translateY(-180%);
  background:var(--cyan);color:#04211b;
  padding:10px 18px;border-radius:var(--radius);
  font-family:var(--font-head);font-size:14px;font-weight:600;letter-spacing:.04em;
  text-decoration:none;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 4. 外框与容器 ---------- */
.frame{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
}
@media (min-width:1280px){
  .frame{border-left:var(--border);border-right:var(--border)}
}
.container{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
}
.split{
  --aside-w:28fr;
  --main-w:72fr;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  border-top:var(--border);
}
.split__aside{min-width:0;padding:0}
.split__main{min-width:0;padding:0}
@media (min-width:900px){
  .split{grid-template-columns:minmax(0,var(--aside-w)) minmax(0,var(--main-w))}
  .split__aside{border-right:var(--border)}
}
.rail{position:sticky;top:calc(var(--header-h-condensed) + 16px);padding:clamp(24px,4vw,48px) clamp(16px,2vw,28px)}

.grid{display:grid;gap:clamp(16px,2.2vw,30px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}

.paper{
  background:var(--paper);
  color:#182028;
}
.paper h1,.paper h2,.paper h3,.paper h4{color:#101820}

/* ---------- 5. 编号章节体系 ---------- */
.section-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap}
.section-head__num{
  font-family:var(--font-num);
  font-size:13px;
  letter-spacing:.22em;
  color:var(--orange);
  line-height:1;
}
.section-head__title{font-size:clamp(21px,2.6vw,30px);margin:0}
.chapter{display:block}
.chapter__num{
  display:block;
  font-family:var(--font-num);
  font-size:clamp(44px,7vw,96px);
  line-height:.85;
  letter-spacing:-.02em;
  color:var(--moss);
}

/* ---------- 6. 数据与标签 ---------- */
.metric{
  display:inline-block;
  font-family:var(--font-num);
  font-size:clamp(30px,4.6vw,56px);
  line-height:1;
  letter-spacing:-.01em;
  color:var(--cyan);
}
.metric--up{color:var(--cyan)}
.metric--down{color:var(--magenta)}
.metric-unit{
  font-family:var(--font-num);
  font-size:14px;
  letter-spacing:.12em;
  color:var(--mist);
  margin-left:6px;
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  height:26px;padding:0 10px;
  background:var(--moss);color:#eef3ef;
  border-radius:var(--radius);
  font-family:var(--font-head);font-size:12px;font-weight:600;letter-spacing:.06em;
  white-space:nowrap;
}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 18px;
  border:1px solid var(--rock);border-radius:var(--radius);
  background:transparent;color:var(--paper);
  font-family:var(--font-head);font-size:14px;font-weight:600;letter-spacing:.04em;
  text-decoration:none;white-space:nowrap;cursor:pointer;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.btn--accent{background:var(--orange);border-color:var(--orange);color:#0b1420}
.btn--accent:hover{background:#ffa055;border-color:#ffa055}
.btn--cyan{background:var(--cyan);border-color:var(--cyan);color:#062018}
.btn--cyan:hover{background:#5ff5dd;border-color:#5ff5dd}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 8. 页面头部（框架式导航） ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(8,19,31,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:var(--border);
}
.site-header::before{
  content:"";display:block;height:2px;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--orange) 62%,var(--magenta) 100%);
}
.header-frame{
  width:100%;max-width:var(--maxw);margin:0 auto;
  padding:0 var(--gutter);
  min-height:var(--header-h);
  display:flex;align-items:center;gap:clamp(10px,1.6vw,28px);
  transition:min-height .24s var(--ease);
}
.site-header[data-condensed="true"] .header-frame{min-height:var(--header-h-condensed)}

.brand{
  display:inline-flex;align-items:center;gap:10px;
  min-height:44px;
  color:var(--paper);text-decoration:none;flex:0 0 auto;
}
.brand__mark{display:block;width:40px;height:22px;color:var(--cyan)}
.brand__mark svg{display:block;width:100%;height:100%}
.brand__name{font-family:var(--font-head);font-size:20px;font-weight:800;letter-spacing:.08em;white-space:nowrap}
.brand--footer{color:var(--paper);margin-bottom:12px}
.brand--footer .brand__name{font-size:17px}

.nav{display:flex;flex:1 1 auto;justify-content:center;min-width:0}
.nav__list{display:flex;align-items:center;flex-wrap:wrap;gap:0;list-style:none}
.nav__link{
  position:relative;
  display:inline-flex;align-items:center;
  min-height:44px;padding:0 12px;
  color:var(--mist);text-decoration:none;
  font-family:var(--font-head);font-size:14px;font-weight:500;letter-spacing:.04em;
  transition:color .2s var(--ease);
}
.nav__link:hover{color:var(--paper)}
.nav__link[aria-current="page"]{color:var(--cyan)}
.nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:12px;right:12px;bottom:8px;height:2px;
  background:var(--cyan);border-radius:1px;
}

.header-actions{display:flex;align-items:center;gap:12px;margin-left:auto;flex:0 0 auto}
.stage-chip{
  display:inline-flex;align-items:center;gap:8px;
  height:30px;padding:0 12px;
  border:var(--border);border-radius:999px;
  color:var(--mist);
  font-family:var(--font-head);font-size:12px;font-weight:500;letter-spacing:.06em;
  white-space:nowrap;
}
.stage-chip::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--orange);box-shadow:0 0 0 3px rgba(255,138,43,.18);
}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  min-height:44px;min-width:44px;padding:0 10px;
  background:transparent;border:var(--border);border-radius:var(--radius);
  color:var(--paper);cursor:pointer;
  font-family:var(--font-head);font-size:13px;letter-spacing:.04em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__box{display:block;position:relative;width:18px;height:12px}
.nav-toggle__bar{
  position:absolute;left:0;width:18px;height:2px;background:currentColor;border-radius:1px;
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle__bar:first-child{top:0}
.nav-toggle__bar:last-child{top:10px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child{top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child{top:5px;transform:rotate(-45deg)}
.nav-toggle__text{display:inline}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,8vw,110px);
  background:var(--ink);
  border-top:var(--border);
  color:var(--mist);
}
.footer-inner{
  width:100%;max-width:var(--maxw);margin:0 auto;
  padding:clamp(40px,6vw,76px) var(--gutter) 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.4fr 1fr;
  gap:clamp(24px,4vw,56px);
}
.footer-col{min-width:0}
.footer-title{
  margin:0 0 14px;
  font-family:var(--font-head);font-size:13px;font-weight:700;letter-spacing:.16em;
  color:var(--paper);
}
.footer-list{list-style:none;display:flex;flex-direction:column;gap:0}
.footer-list a{
  display:inline-flex;align-items:center;min-height:40px;
  color:var(--mist);text-decoration:none;
  font-family:var(--font-head);font-size:14px;letter-spacing:.04em;
  transition:color .2s var(--ease);
}
.footer-list a:hover{color:var(--cyan)}
.footer-list--plain li{
  padding:8px 0;
  font-size:14px;line-height:1.7;
  font-family:var(--font-head);letter-spacing:.02em;
  overflow-wrap:anywhere;
}
.footer-meta{
  font-family:var(--font-num);font-size:14px;letter-spacing:.08em;
  color:rgba(199,211,220,.75);
}
.footer-note{
  margin-top:8px;
  font-size:13px;line-height:1.8;
  color:rgba(199,211,220,.7);
}
.footer-fix{
  display:inline-flex;align-items:center;min-height:44px;margin-top:4px;
  color:var(--orange);text-decoration:none;
  font-family:var(--font-head);font-size:14px;font-weight:600;letter-spacing:.04em;
  border-bottom:1px solid transparent;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.footer-fix:hover{color:#ffa055;border-bottom-color:#ffa055}
.footer-bottom{
  margin-top:clamp(32px,5vw,56px);
  padding:20px 0 28px;
  border-top:var(--border);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
}
.footer-copy{
  font-family:var(--font-num);font-size:13px;letter-spacing:.08em;
  color:rgba(199,211,220,.75);margin:0;
}
.footer-legal{list-style:none;display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{
  display:inline-flex;align-items:center;min-height:44px;
  color:var(--mist);text-decoration:none;
  font-family:var(--font-head);font-size:13px;letter-spacing:.06em;
  transition:color .2s var(--ease);
}
.footer-legal a:hover{color:var(--cyan)}

/* ---------- 10. 面包屑与正文 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:0;
  list-style:none;
  padding:16px 0;
  font-family:var(--font-head);font-size:12px;letter-spacing:.08em;color:var(--mist);
}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li::after{content:"/";margin:0 10px;color:var(--rock)}
.breadcrumb li:last-child::after{content:none}
.breadcrumb a{color:var(--mist);text-decoration:none}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

.prose{max-width:74ch;font-family:var(--font-body);font-size:17px;line-height:1.85}
.prose > * + *{margin-top:1.1em}
.prose h2{font-size:clamp(21px,2.4vw,28px);margin-top:1.9em}
.prose h3{font-size:clamp(18px,2vw,22px);margin-top:1.6em}
.prose ul,.prose ol{padding-left:1.4em;list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.45em}
.prose a{color:var(--clay);text-decoration:underline;text-underline-offset:3px}
.prose .paper a{color:#9c4f2e}
.prose code{
  font-family:var(--font-num);font-size:.94em;
  background:rgba(46,55,66,.35);padding:2px 6px;border-radius:var(--radius);
}

/* ---------- 11. 图片容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--panel);
  border:var(--border);
  border-radius:var(--radius);
}
.media::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(135deg,transparent 45%,rgba(53,240,208,.10) 45%,rgba(53,240,208,.10) 55%,transparent 55%);
}
.media img,.media video{
  display:block;width:100%;height:100%;object-fit:cover;
  transition:transform .5s var(--ease);
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media--wide{aspect-ratio:21/9}
.media__tag{
  position:absolute;top:0;left:0;z-index:2;
  display:inline-flex;align-items:center;height:26px;padding:0 10px;
  background:var(--orange);color:#0b1420;
  font-family:var(--font-num);font-size:12px;letter-spacing:.1em;
}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:22px 14px 10px;
  background:linear-gradient(180deg,transparent,rgba(5,9,15,.86));
  color:var(--mist);
  font-family:var(--font-head);font-size:12px;letter-spacing:.05em;line-height:1.6;
}

/* ---------- 12. 动效与脚本类 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

.back-to-top{
  position:fixed;right:clamp(14px,2vw,28px);bottom:clamp(14px,2vw,28px);z-index:70;
  width:48px;height:48px;
  display:grid;place-items:center;
  background:var(--panel);color:var(--cyan);
  border:var(--border);border-radius:50%;
  font-family:var(--font-num);font-size:20px;line-height:1;
  cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .25s var(--ease),transform .25s var(--ease),visibility .25s var(--ease),border-color .2s var(--ease);
}
.back-to-top.is-visible{opacity:1;visibility:visible;transform:none}
.back-to-top:hover{border-color:var(--cyan)}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1024px){
  .nav-toggle{display:inline-flex;order:3;margin-left:auto}
  .nav{
    position:absolute;top:100%;left:0;right:0;
    display:none;
    flex-direction:column;justify-content:flex-start;
    background:var(--panel);
    border-bottom:var(--border);
    padding:8px var(--gutter) 22px;
    max-height:calc(100vh - var(--header-h-condensed) - 2px);
    overflow-y:auto;
  }
  .site-header[data-open="true"] .nav{display:flex}
  .nav__list{flex-direction:column;align-items:stretch;width:100%}
  .nav__list li{width:100%}
  .nav__link{
    width:100%;min-height:54px;padding:0 4px;
    border-bottom:1px solid rgba(46,55,66,.7);
    font-size:16px;
  }
  .nav__link[aria-current="page"]::after{left:4px;right:auto;width:24px;bottom:16px}
  .header-actions{margin-left:0;order:2}
  .header-actions .stage-chip{display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  :root{--gutter:18px}
  .brand__name{font-size:17px}
  .brand__mark{width:34px;height:19px}
  .nav-toggle__text{display:none}
  .header-actions .btn{padding:0 12px;font-size:13px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* ---------- 14. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  [data-reveal]{opacity:1;transform:none}
  .site-header[data-condensed="true"] .header-frame{transition:none}
}