/* =========================================================
   博业体育 · 共享样式表  /assets/site.css
   夜幕墨绿底 + 荧光青数据 + 暖橙节点，期刊报头式骨架
   ========================================================= */

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

/* ---------- 2. 变量 ---------- */
:root{
  --night:#08130F;
  --court:#0E241C;
  --moss:#1C3A2E;
  --cyan:#3FF0C8;
  --mist:#A8F5E2;
  --amber:#FF8A3D;
  --clay:#B56A4A;
  --stone:#6E7C77;
  --stone-2:#96A49E;
  --paper:#F2EFE6;
  --graphite:#12211C;
  --ink-soft:#C9D6D0;
  --ink-on-paper:#0C5A47;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-data:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shell:1180px;
  --rail:88px;
  --r-card:18px;
  --r-soft:14px;
  --r-pill:999px;

  --dur:320ms;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-deep:0 22px 48px -28px rgba(0,0,0,.9);
}

/* ---------- 3. 基础排版（中文优先） ---------- */
body{
  background:var(--night);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1.18;
}
h1{font-size:clamp(40px,7vw,96px);line-height:1.06}
h2{font-size:clamp(26px,3.4vw,44px)}
h3{font-size:clamp(19px,2vw,24px);line-height:1.3}
h4{font-size:clamp(16px,1.5vw,19px);line-height:1.35}
p{max-width:64ch}
strong{font-weight:700;color:var(--cyan)}
::selection{background:var(--cyan);color:var(--night)}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
.section--paper :focus-visible{outline-color:var(--ink-on-paper)}

#main-content{scroll-margin-top:112px}

/* ---------- 4. 布局骨架 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:20px}
.section{padding:clamp(48px,7vw,96px) 0}
.section--court{background:var(--court)}
.section--paper{background:var(--paper);color:var(--graphite)}
.section--paper h1,.section--paper h2,.section--paper h3{color:var(--graphite)}
.section--paper a{color:var(--ink-on-paper);text-decoration:underline;text-underline-offset:3px}
.section--paper strong{color:var(--graphite)}

.grid{display:grid;gap:16px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}

.layout-rail{
  display:grid;
  grid-template-columns:var(--rail) minmax(0,1fr);
  gap:clamp(20px,3vw,40px);
  align-items:start;
}

/* 轮次轴 */
.rail{
  position:sticky;
  top:120px;
  display:flex;
  flex-direction:column;
  gap:6px;
  font-family:var(--font-data);
}
.rail__link{
  display:block;
  padding:8px 10px;
  border-left:2px solid var(--moss);
  color:var(--stone-2);
  font-size:12px;
  letter-spacing:.08em;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.rail__link:hover{color:var(--mist);border-color:var(--mist)}
.rail__link.is-active,
.rail__link[aria-current="true"]{
  color:var(--cyan);
  border-color:var(--cyan);
  background:rgba(63,240,200,.08);
}

/* ---------- 5. 段头与标签文字 ---------- */
.eyebrow{
  display:inline-block;
  font-family:var(--font-data);
  font-size:12px;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.section--paper .eyebrow{color:var(--ink-on-paper)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:clamp(20px,3vw,36px);
}
.section__title{margin-top:6px}
.section__lede{
  max-width:44ch;
  color:var(--ink-soft);
  font-size:15px;
  line-height:1.8;
}
.section--paper .section__lede{color:#3B4A44}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.2;
  cursor:pointer;
  transition:transform .2s var(--ease),background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn--primary{background:var(--amber);color:var(--night)}
.btn--primary:hover{background:#FFA564;transform:translateY(-2px)}
.btn--ghost{background:transparent;border-color:var(--moss);color:var(--mist)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}

/* ---------- 7. 标签 ---------- */
.tag-list{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;
  align-items:center;
  padding:5px 12px;
  border:1px solid var(--moss);
  border-radius:var(--r-pill);
  background:rgba(168,245,226,.1);
  color:var(--mist);
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  line-height:1.5;
}
.tag--cyan{background:rgba(63,240,200,.14);border-color:rgba(63,240,200,.4);color:var(--cyan)}
.tag--amber{background:rgba(255,138,61,.14);border-color:rgba(255,138,61,.38);color:var(--amber)}
.section--paper .tag{background:rgba(18,33,28,.06);border-color:rgba(18,33,28,.18);color:var(--graphite)}

/* ---------- 8. 卡片与数据 ---------- */
.card{
  position:relative;
  display:block;
  padding:20px;
  background:var(--court);
  border:1px solid var(--moss);
  border-radius:var(--r-card);
  transition:border-color .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease);
}
.card:hover{border-color:rgba(63,240,200,.5);transform:translateY(-3px);box-shadow:var(--shadow-deep)}
.card__head{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.card__title{font-family:var(--font-body);font-size:17px;font-weight:700;line-height:1.35;letter-spacing:.01em}
.card__meta{font-family:var(--font-data);font-size:12px;letter-spacing:.04em;color:var(--stone-2);white-space:nowrap}
.card__body{margin-top:10px;color:var(--ink-soft);font-size:14.5px;line-height:1.7}
.card__foot{
  margin-top:16px;
  padding-top:12px;
  border-top:1px solid var(--moss);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  font-size:12.5px;
  color:var(--stone-2);
}
.card.is-copied{border-color:var(--cyan)}

.num{font-family:var(--font-data);font-weight:700;letter-spacing:.02em;font-variant-numeric:tabular-nums}
.num--xl{
  display:block;
  font-family:var(--font-data);
  font-weight:700;
  font-size:clamp(40px,7vw,84px);
  line-height:.9;
  letter-spacing:-.03em;
  color:var(--cyan);
}

.stat{display:flex;flex-direction:column;gap:2px}
.stat__value{font-family:var(--font-data);font-weight:700;font-size:clamp(26px,3.6vw,42px);line-height:1;color:var(--cyan)}
.stat__label{font-size:12px;letter-spacing:.12em;color:var(--stone-2)}

/* ---------- 9. 正文容器与面包屑 ---------- */
.prose{max-width:34em;font-size:16px;line-height:1.85}
.prose > * + *{margin-top:1.1em}
.prose h2{margin-top:2em;font-size:clamp(22px,2.6vw,32px)}
.prose h3{margin-top:1.6em}
.prose ul{list-style:none}
.prose li{position:relative;padding-left:1.15em}
.prose li + li{margin-top:.4em}
.prose li::before{
  content:"";
  position:absolute;
  left:0;top:.72em;
  width:6px;height:6px;
  border-radius:2px;
  background:var(--cyan);
}
.section--paper .prose li::before{background:var(--clay)}

.breadcrumbs{padding-top:20px}
.breadcrumbs__list{
  display:flex;
  flex-wrap:wrap;
  gap:4px;
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--stone-2);
}
.breadcrumbs__item{display:inline-flex;align-items:center}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";margin-right:8px;color:var(--stone)}
.breadcrumbs__item a{color:var(--mist)}
.breadcrumbs__item a:hover{color:var(--cyan)}

/* ---------- 10. 手风琴（FAQ） ---------- */
.accordion{border-top:1px solid var(--moss)}
.accordion__item{border-bottom:1px solid var(--moss)}
.accordion__summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 0;
  cursor:pointer;
  font-size:16.5px;
  font-weight:700;
  list-style:none;
}
.accordion__summary::-webkit-details-marker{display:none}
.accordion__summary::after{
  content:"+";
  flex:none;
  font-family:var(--font-data);
  font-weight:700;
  color:var(--cyan);
  font-size:20px;
  line-height:1;
}
.accordion__item[open] .accordion__summary::after{content:"–"}
.accordion__panel{padding-bottom:20px;color:var(--ink-soft);font-size:15px;line-height:1.8}
.section--paper .accordion{border-color:rgba(18,33,28,.16)}
.section--paper .accordion__item{border-color:rgba(18,33,28,.16)}
.section--paper .accordion__panel{color:#3B4A44}

/* ---------- 11. 图像容器 ---------- */
.media{
  position:relative;
  overflow:hidden;
  border-radius:var(--r-card);
  background:linear-gradient(142deg,var(--court),var(--night) 62%,#0a1a14);
}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(.72) contrast(1.06)}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:linear-gradient(135deg,rgba(181,106,74,.34),rgba(8,19,15,.72) 64%);
}
.media__caption{
  position:absolute;
  left:16px;right:16px;bottom:14px;
  z-index:2;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}

/* ---------- 12. 动效 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 13. 页头 / 刊头 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-70px;
  z-index:120;
  padding:10px 18px;
  border-radius:var(--r-pill);
  background:var(--cyan);
  color:var(--night);
  font-size:14px;
  font-weight:700;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--night);
  border-bottom:1px solid var(--moss);
  transition:box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
}
.site-header.is-compact{
  background:var(--court);
  box-shadow:0 16px 34px -26px rgba(0,0,0,.95);
}
.site-header__inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  grid-template-areas:
    "lead brand cta"
    "nav nav nav";
  align-items:center;
  justify-items:center;
  gap:2px 16px;
  padding:26px 0 14px;
  transition:padding var(--dur) var(--ease);
}
.brand{
  grid-area:brand;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:3px;
  text-align:center;
}
.brand__name{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(24px,3.2vw,38px);
  letter-spacing:-.02em;
  line-height:1.05;
  color:var(--paper);
}
.brand__tagline{
  font-size:12px;
  letter-spacing:.2em;
  color:var(--mist);
  white-space:nowrap;
}
.site-nav{grid-area:nav;width:100%;border-top:1px solid var(--moss);padding-top:10px;margin-top:10px}
.site-nav__list{display:flex;flex-wrap:wrap;justify-content:center;gap:4px}
.site-nav__item{display:block}
.site-nav__link{
  display:inline-block;
  padding:8px 14px;
  border-radius:var(--r-pill);
  font-size:14px;
  letter-spacing:.06em;
  color:var(--mist);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.site-nav__link:hover{color:var(--cyan);background:rgba(63,240,200,.08)}
.site-nav__link[aria-current="page"]{
  color:var(--cyan);
  background:rgba(63,240,200,.1);
  box-shadow:inset 0 -2px 0 var(--cyan);
}
.site-header__actions{
  grid-area:cta;
  justify-self:end;
  display:flex;
  align-items:center;
  gap:10px;
}
.site-header__cta{white-space:nowrap}
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:9px 14px;
  border:1px solid var(--moss);
  border-radius:var(--r-pill);
  color:var(--mist);
  font-size:12px;
  letter-spacing:.12em;
}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;right:0;
  height:2px;
  background:var(--cyan);
  transition:transform .24s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4px) rotate(-45deg)}

/* 桌面端压缩态：一行吸顶 */
@media (min-width:901px){
  .site-header.is-compact .site-header__inner{
    grid-template-columns:auto 1fr auto;
    grid-template-areas:"brand nav cta";
    padding:8px 0;
    gap:12px 24px;
  }
  .site-header.is-compact .brand{align-items:flex-start;text-align:left}
  .site-header.is-compact .brand__name{font-size:22px}
  .site-header.is-compact .brand__tagline{display:none}
  .site-header.is-compact .site-nav{border-top-color:transparent;padding-top:0;margin-top:0}
}

/* ---------- 14. 页脚 / 期刊版权页 ---------- */
.site-footer{
  background:var(--night);
  border-top:1px solid var(--moss);
  color:var(--mist);
  padding-top:clamp(40px,6vw,72px);
}
.site-footer__inner{
  display:grid;
  grid-template-columns:1.15fr 1fr 1.25fr;
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(28px,4vw,48px);
}
.footer__col{min-width:0}
.footer__brand{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(22px,2.4vw,28px);
  letter-spacing:-.01em;
  color:var(--paper);
}
.footer__tagline{margin-top:10px;max-width:26ch;font-size:14px;line-height:1.8;color:var(--ink-soft)}
.footer__meta{margin-top:10px;font-size:12.5px;letter-spacing:.06em;color:var(--stone-2)}
.footer__title{
  font-family:var(--font-body);
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--cyan);
  margin-bottom:14px;
}
.footer__list li + li{margin-top:8px}
.footer__list a,.footer__address{
  font-size:14px;
  line-height:1.7;
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer__list a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer__address{margin-top:14px;color:var(--ink-soft)}
.footer__col--contact .tag-list{margin-top:16px}
.site-footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 20px;
  padding-top:18px;
  padding-bottom:28px;
  border-top:1px solid var(--moss);
  font-family:var(--font-data);
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--stone-2);
}
.site-footer__base p{max-width:none}

/* ---------- 15. 响应式 ---------- */
@media (max-width:1080px){
  :root{--rail:72px}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  body{font-size:15px;line-height:1.8;padding-bottom:84px}
  .site-header__inner{
    grid-template-columns:1fr auto;
    grid-template-areas:
      "brand toggle"
      "nav nav";
    justify-items:stretch;
    gap:8px 12px;
    padding:14px 0 12px;
  }
  .brand{align-items:flex-start;text-align:left;justify-self:start}
  .brand__name{font-size:23px}
  .brand__tagline{font-size:10.5px;letter-spacing:.16em;white-space:normal}
  .site-header__actions{justify-self:end}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    border-top:1px solid var(--moss);
    padding-top:10px;
    margin-top:6px;
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;gap:2px;align-items:stretch}
  .site-nav__link{
    display:block;
    padding:13px 14px;
    border-radius:var(--r-soft);
    font-size:15.5px;
  }
  .site-nav__link[aria-current="page"]{box-shadow:inset 3px 0 0 var(--cyan)}
  .site-header__cta{
    position:fixed;
    left:16px;
    right:16px;
    bottom:16px;
    z-index:70;
    justify-content:center;
    padding:14px 20px;
    font-size:15px;
    box-shadow:0 18px 36px -18px rgba(255,138,61,.8);
  }
  .layout-rail{grid-template-columns:minmax(0,1fr);gap:20px}
  .rail{
    position:static;
    flex-direction:row;
    overflow-x:auto;
    gap:8px;
    padding-bottom:6px;
  }
  .rail__link{
    border-left:0;
    border-bottom:2px solid var(--moss);
    white-space:nowrap;
  }
  .rail__link.is-active,.rail__link[aria-current="true"]{border-bottom-color:var(--cyan)}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .section__head{align-items:flex-start}
  .site-footer__inner{grid-template-columns:minmax(0,1fr);gap:32px}
  .site-footer__base{justify-content:flex-start}
}
@media (max-width:560px){
  .shell{padding-inline:16px}
  .card{padding:16px;border-radius:var(--r-soft)}
  .section{padding:44px 0}
  .prose{max-width:100%}
}

/* ---------- 16. 可访问性与减弱动效 ---------- */
@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;transition:none}
  .btn:hover,.card:hover{transform:none}
}