/* ============================================================
   168体育主站 · 共享样式表 /assets/site.css
   母题：脉搏原点（同心圆 · 脉冲折线 · 90 秒刻度）
   ============================================================ */

/* ---------- 0. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html,body,div,span,h1,h2,h3,h4,h5,h6,p,ul,ol,li,dl,dd,figure,figcaption,blockquote,address,header,footer,nav,main,section,article,aside{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video,picture{display:block;max-width:100%;height:auto}
table{border-collapse:collapse;width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
b,strong{font-weight:800}
address{font-style:normal}

/* ---------- 1. 变量 ---------- */
:root{
  color-scheme:dark;
  --void:#05070E;
  --panel:#0C1428;
  --lift:#131E3A;
  --cyan:#22E0FF;
  --pulse:#FF6A1A;
  --sage:#7E9C8C;
  --text:#E9EFF7;
  --dim:#9AA7BA;
  --line:#2A3A55;
  --alert:#FF4D5E;

  --font-head:"Archivo Narrow","Saira Condensed","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
  --font-body:"Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-data:"JetBrains Mono","SFMono-Regular","Roboto Mono",Consolas,"Liberation Mono","Courier New",monospace;

  --fs-hero:clamp(40px,6vw,72px);
  --fs-h2:clamp(28px,3.4vw,40px);
  --fs-h3:clamp(20px,2vw,24px);
  --fs-body:clamp(16px,1.05vw,17px);
  --fs-note:clamp(13px,.9vw,14px);

  --shell-max:1280px;
  --shell-pad:clamp(18px,4vw,40px);
  --gap:clamp(16px,2vw,28px);
  --band:clamp(24px,5vw,96px);
  --ease:120ms cubic-bezier(.32,.72,.28,1);
}

/* ---------- 2. 基础排版 ---------- */
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:110px}
body{
  min-height:100vh;
  background-color:var(--void);
  color:var(--text);
  font-family:var(--font-body);
  font-size:var(--fs-body);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(42,58,85,.26) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(42,58,85,.26) 1px,transparent 1px);
  background-size:96px 96px;
  opacity:.55;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.08;
  letter-spacing:-.01em;
  text-transform:uppercase;
}
h1{font-size:var(--fs-hero)}
h2{font-size:var(--fs-h2)}
h3{font-size:var(--fs-h3)}
p{max-width:42em}
::selection{background:rgba(34,224,255,.28);color:#fff}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

/* ---------- 3. 容器与工具 ---------- */
.shell{width:100%;max-width:var(--shell-max);margin-inline:auto;padding-inline:var(--shell-pad)}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{
  position:absolute;left:14px;top:-60px;z-index:120;
  padding:10px 16px;background:var(--cyan);color:#04121A;
  font-weight:700;font-size:14px;letter-spacing:.04em;
  transition:top var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 4. 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(5,7,14,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-top{
  display:none;
  background:linear-gradient(90deg,var(--panel) 0%,rgba(12,20,40,.35) 100%);
  border-bottom:1px solid var(--line);
}
.site-header[data-open] .header-top{display:block}
.header-top__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 18px;min-height:40px;padding-block:8px;
}
.header-top__tagline{
  display:flex;align-items:center;gap:9px;
  font-family:var(--font-data);font-size:12px;letter-spacing:.16em;
  color:var(--dim);max-width:none;
}
.header-top__tagline::before{
  content:"";width:7px;height:7px;flex:none;background:var(--cyan);
  box-shadow:0 0 0 3px rgba(34,224,255,.16);
  animation:pulse-dot 2.6s ease-in-out infinite;
}
@keyframes pulse-dot{0%,100%{opacity:1}50%{opacity:.35}}
.header-utility{display:flex;align-items:center;gap:16px}
.header-utility__link{
  display:inline-flex;align-items:center;
  padding:3px 0;border-bottom:1px solid transparent;
  font-size:13px;letter-spacing:.04em;color:var(--dim);
  transition:color var(--ease),border-color var(--ease);
}
.header-utility__link:hover,.header-utility__link:focus-visible{color:var(--text);border-bottom-color:var(--cyan)}
.header-utility__link--accent{color:var(--pulse)}
.header-utility__link--accent:hover,.header-utility__link--accent:focus-visible{color:var(--pulse);border-bottom-color:var(--pulse)}

.header-main__inner{
  position:relative;
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;min-height:60px;padding-block:10px;
}
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.brand__pulse{position:relative;width:24px;height:24px;flex:none;border:1px solid var(--cyan);border-radius:50%}
.brand__pulse::before{content:"";position:absolute;inset:4px;border:1px solid rgba(34,224,255,.45);border-radius:50%}
.brand__pulse::after{content:"";position:absolute;left:50%;top:50%;width:5px;height:5px;margin:-2.5px 0 0 -2.5px;background:var(--pulse)}
.brand__text{display:flex;flex-direction:column;line-height:1}
.brand__cn{font-family:var(--font-head);font-size:19px;font-weight:800;letter-spacing:-.01em;color:var(--text)}
.brand__en{font-family:var(--font-data);font-size:10px;letter-spacing:.24em;text-transform:uppercase;color:var(--sage);margin-top:5px}

.site-nav{display:none}
.site-header[data-open] .site-nav{
  display:block;position:absolute;left:0;right:0;top:100%;
  max-height:calc(100vh - 110px);overflow-y:auto;
  padding:6px var(--shell-pad) 20px;
  background:var(--panel);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.site-nav__list{display:flex;flex-direction:column}
.site-nav__item{border-bottom:1px solid rgba(42,58,85,.55)}
.site-nav__item:last-child{border-bottom:0}
.site-nav__link{
  position:relative;display:block;padding:14px 2px;
  font-family:var(--font-head);font-size:17px;font-weight:700;letter-spacing:.02em;
  color:var(--dim);
  transition:color var(--ease),padding-left var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;bottom:-1px;width:0;height:2px;
  background:var(--cyan);transition:width 180ms cubic-bezier(.32,.72,.28,1);
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--text);padding-left:6px}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{width:28px}
.site-nav__link[aria-current="page"]{color:var(--text)}
.site-nav__link[aria-current="page"]::after{width:36px;background:var(--pulse);transition-duration:0ms}

.header-search{display:none}
.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 13px;border:1px solid var(--line);
  font-size:13px;letter-spacing:.12em;color:var(--text);
  transition:border-color var(--ease),background var(--ease),color var(--ease);
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--cyan);background:rgba(34,224,255,.08)}
.nav-toggle[aria-expanded="true"]{border-color:var(--pulse);color:var(--pulse);background:rgba(255,106,26,.08)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:1px;background:currentColor;transition:transform 180ms ease,opacity 180ms ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(42,58,85,.7);overflow:hidden}
.scroll-progress__bar{
  display:block;width:100%;height:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--pulse) 100%);
}

@media (min-width:900px){
  .header-top{display:block}
  .header-top__inner{min-height:38px}
  .header-main__inner{min-height:66px}
  .nav-toggle{display:none}
  .site-nav,
  .site-header[data-open] .site-nav{
    display:block;position:static;left:auto;right:auto;top:auto;
    max-height:none;overflow:visible;padding:0;background:none;border:0;
  }
  .site-nav__list{flex-direction:row;align-items:center;gap:clamp(14px,2vw,30px)}
  .site-nav__item{border-bottom:0}
  .site-nav__link{padding:22px 0;font-size:16px}
  .site-nav__link:hover,.site-nav__link:focus-visible{padding-left:0}
  .header-search{
    display:inline-flex;align-items:center;gap:10px;
    min-width:208px;padding:9px 14px;
    border:1px solid var(--line);
    font-family:var(--font-data);font-size:12px;letter-spacing:.1em;color:var(--dim);
    transition:border-color var(--ease),color var(--ease),background var(--ease);
  }
  .header-search::before{content:"";width:8px;height:8px;flex:none;border:1px solid var(--cyan);transform:rotate(45deg)}
  .header-search:hover,.header-search:focus-visible{border-color:var(--cyan);color:var(--text);background:rgba(34,224,255,.06)}
}

/* ---------- 5. 章节与版式组件 ---------- */
.chapter{position:relative}
.section-band{padding-block:var(--band);border-top:1px solid var(--line)}
.section-band.chapter.is-active{border-top-color:var(--cyan)}
.section-head{display:grid;gap:14px;margin-bottom:clamp(20px,3vw,40px)}
.section-num{
  font-family:var(--font-data);font-size:clamp(28px,4vw,56px);line-height:1;
  color:var(--line);letter-spacing:.02em;
  transition:color 240ms ease;
}
.chapter.is-active .section-num{color:var(--pulse)}
.section-title{font-size:var(--fs-h2);max-width:22em}
.section-lead{font-size:var(--fs-body);color:var(--dim);max-width:38em}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-data);font-size:13px;letter-spacing:.16em;color:var(--pulse);
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--pulse)}

/* ---------- 6. 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 22px;border:1px solid var(--line);
  font-family:var(--font-head);font-size:15px;font-weight:800;letter-spacing:.04em;
  color:var(--text);background:transparent;border-radius:0;text-align:center;
  transition:color var(--ease),border-color var(--ease),background var(--ease),transform 180ms ease;
}
.btn:hover,.btn:focus-visible{border-color:var(--cyan);color:var(--cyan)}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--pulse);border-color:var(--pulse);color:#180800}
.btn--primary:hover,.btn--primary:focus-visible{background:#FF8340;border-color:#FF8340;color:#180800}
.btn--ghost{border-color:var(--cyan);color:var(--cyan)}
.btn--ghost:hover,.btn--ghost:focus-visible{background:rgba(34,224,255,.1);color:var(--cyan)}
.btn--quiet{border-color:transparent;color:var(--dim);padding-inline:6px}
.btn--quiet:hover,.btn--quiet:focus-visible{color:var(--cyan);border-color:transparent}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--line);background:rgba(42,58,85,.22);
  font-family:var(--font-data);font-size:12px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--dim);border-radius:0;
}
.tag--pulse{border-color:var(--pulse);background:rgba(255,106,26,.12);color:var(--pulse)}
.tag--cyan{border-color:var(--cyan);background:rgba(34,224,255,.1);color:var(--cyan)}
.tag--sage{border-color:var(--sage);background:rgba(126,156,140,.12);color:var(--sage)}

.card{
  position:relative;padding:clamp(18px,2.4vw,28px);
  background:var(--panel);border:1px solid var(--line);border-radius:0;
  display:grid;gap:12px;align-content:start;
  transition:border-color var(--ease),background var(--ease);
}
.card:hover{border-color:var(--cyan)}
.card--lift{background:var(--lift)}
.card--lift:hover{background:#16233F}
.card__label{font-family:var(--font-data);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--sage)}
.card__title{font-size:var(--fs-h3);letter-spacing:-.005em}
.card__meta{font-size:var(--fs-note);color:var(--dim)}

.stat{display:grid;gap:6px;padding-top:14px;border-top:1px solid var(--line)}
.stat__value{font-family:var(--font-data);font-size:clamp(24px,3vw,34px);line-height:1.1;color:var(--text);letter-spacing:-.01em}
.stat__label{font-family:var(--font-data);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.stat__delta{font-family:var(--font-data);font-size:12px;color:var(--cyan)}
.stat__delta--alert{color:var(--alert)}

.grid{display:grid;gap:var(--gap)}
@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:960px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--asym{grid-template-columns:minmax(0,7fr) minmax(0,3fr)}
}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-data);font-size:13px;letter-spacing:.06em;color:var(--dim);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item:not(:last-child)::after{content:"/";color:var(--line)}
.breadcrumb__item a{color:var(--dim);border-bottom:1px solid transparent;transition:color var(--ease),border-color var(--ease)}
.breadcrumb__item a:hover,.breadcrumb__item a:focus-visible{color:var(--cyan);border-bottom-color:var(--cyan)}

.prose{font-size:var(--fs-body);line-height:1.75;color:#CFD8E6}
.prose p{margin-bottom:1em;max-width:42em}
.prose h2,.prose h3{margin:1.4em 0 .6em;color:var(--text)}
.prose ul,.prose ol{margin:0 0 1em;padding-left:1.1em;max-width:42em}
.prose ul li{position:relative;padding-left:14px;margin-bottom:.5em}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:1px;background:var(--pulse)}
.prose ol{list-style:decimal}
.prose blockquote{
  margin:1.4em 0;padding:6px 0 6px 18px;
  border-left:2px solid var(--sage);color:var(--dim);
}
.prose a{border-bottom:1px solid rgba(34,224,255,.5);color:var(--cyan)}
.prose code{font-family:var(--font-data);font-size:.95em;color:var(--cyan)}

.media-frame{
  position:relative;overflow:hidden;border:1px solid var(--line);
  background:var(--lift);aspect-ratio:16/9;border-radius:0;
}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.85) contrast(1.06)}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:10px 14px;background:linear-gradient(180deg,transparent,rgba(5,7,14,.9));
  font-family:var(--font-data);font-size:12px;letter-spacing:.1em;color:var(--dim);
}

/* ---------- 7. 显现与章节高亮 ---------- */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity 480ms ease,transform 480ms cubic-bezier(.32,.72,.28,1)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(48px,8vw,120px);
  background:linear-gradient(180deg,rgba(12,20,40,.7) 0%,var(--void) 72%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;left:0;top:-1px;width:min(260px,45%);height:2px;
  background:linear-gradient(90deg,var(--cyan),transparent);
}
.footer__inner{
  display:grid;grid-template-columns:1fr;gap:clamp(24px,4vw,40px);
  padding-block:clamp(36px,5vw,64px);
}
.footer__brand{display:flex;flex-direction:column;gap:12px;max-width:34ch}
.footer__brandname{font-family:var(--font-head);font-size:24px;font-weight:800;letter-spacing:-.01em}
.footer__tagline{font-size:var(--fs-note);color:var(--dim)}
.footer__icp{font-family:var(--font-data);font-size:12px;letter-spacing:.06em;color:var(--sage)}
.footer__col{display:flex;flex-direction:column;gap:14px;min-width:0}
.footer__col-title{
  padding-bottom:10px;border-bottom:1px solid var(--line);
  font-family:var(--font-data);font-size:12px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--sage);
}
.footer__list{display:flex;flex-direction:column;gap:10px}
.footer__link{
  display:inline-block;font-size:var(--fs-note);color:var(--dim);
  transition:color var(--ease);
}
.footer__link:hover,.footer__link:focus-visible{color:var(--cyan)}
.footer__legal{border-top:1px solid var(--line);background:rgba(5,7,14,.65)}
.footer__contact{
  display:flex;flex-wrap:wrap;gap:6px 26px;
  padding-top:20px;font-size:var(--fs-note);color:var(--dim);
}
.footer__contact-row{display:inline-flex;align-items:center}
.footer__legal-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 26px;padding-block:18px;
  font-size:13px;color:var(--dim);
}
.footer__legal-line{font-family:var(--font-data);letter-spacing:.05em;max-width:none}
.footer__legal-meta{font-family:var(--font-data);letter-spacing:.05em;color:var(--sage);max-width:none}

@media (min-width:640px){
  .footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .footer__inner{grid-template-columns:1.6fr 1fr 1.2fr 1fr 1fr}
}

/* ---------- 9. 响应式与动效偏好 ---------- */
@media (min-width:768px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1180px){
  :root{--shell-pad:48px}
}
@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!important;transform:none!important}
  .scroll-progress__bar{transition:none}
}