/* =========================================================
   天行体育主站 · 共享样式 /assets/site.css
   夜跑数据流 · 粗野主义赛道体系
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#070C14;
  --board:#101A28;
  --lime:#C8FF3D;
  --orange:#FF6A1F;
  --cyan:#2FE0DC;
  --paper:#F2EDE1;
  --mist:#9DAAB9;
  --white:#FFFFFF;
  --amber:#FFB324;
  --grass:#14260B;

  --line:rgba(157,170,185,.26);
  --line-strong:rgba(157,170,185,.52);

  --shell:1360px;
  --gutter:24px;
  --edge:20px;
  --header-h:76px;
  --header-h-scrolled:58px;
  --quickbar-h:54px;

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",Inter,system-ui,sans-serif;
  --font-body:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;padding:0;cursor:pointer;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--lime);outline-offset:3px;}

/* ---------- 3. 中文排版基线 ---------- */
body{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  padding-bottom:var(--quickbar-h);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.15;
  letter-spacing:-.02em;
  color:var(--white);
}
h1{font-size:clamp(2.2rem,5.4vw,4.4rem);}
h2{font-size:clamp(1.6rem,3.4vw,2.6rem);}
h3{font-size:clamp(1.2rem,2.2vw,1.6rem);}
p{max-width:68ch;}
strong{color:var(--white);font-weight:800;}
.num,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 4. 布局骨架 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
#main-content{
  display:block;
  padding-top:var(--header-h);
  scroll-margin-top:var(--header-h);
}
body[data-overlay] #main-content{padding-top:0;}

.section{padding-top:88px;padding-bottom:88px;}
.section--tight{padding-top:56px;padding-bottom:56px;}
.section--paper{background:var(--paper);color:var(--ink);}
.section--panel{background:var(--board);}
.section--paper h1,.section--paper h2,.section--paper h3{color:var(--ink);}
.section--edge{border-top:2px solid var(--line);}

.section__head{margin-bottom:40px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--cyan);margin-bottom:16px;
}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--lime);flex:none;}
.lede{font-size:clamp(1rem,1.4vw,1.15rem);color:var(--mist);max-width:60ch;}

.grid{display:grid;gap:24px;}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr));}
.split{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:32px;align-items:start;}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;
  border:2px solid var(--white);
  background:transparent;
  color:var(--white);
  font-family:var(--font-body);
  font-size:15px;font-weight:700;letter-spacing:.02em;line-height:1;
  box-shadow:6px 6px 0 rgba(7,12,20,.85);
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:8px 8px 0 rgba(7,12,20,.85);}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 rgba(7,12,20,.85);}
.btn--lime{background:var(--lime);border-color:var(--lime);color:var(--ink);box-shadow:6px 6px 0 var(--grass);}
.btn--lime:hover{box-shadow:8px 8px 0 var(--grass);}
.btn--lime:active{box-shadow:2px 2px 0 var(--grass);}
.btn--orange{background:var(--orange);border-color:var(--orange);color:var(--ink);box-shadow:6px 6px 0 var(--grass);}
.btn--orange:hover{box-shadow:8px 8px 0 var(--grass);}
.btn--ghost{background:transparent;border-color:var(--lime);color:var(--lime);}
.btn--sm{padding:10px 15px;font-size:14px;box-shadow:4px 4px 0 var(--grass);}
.btn--sm:hover{box-shadow:5px 5px 0 var(--grass);}

/* ---------- 6. 标签 / 徽标 ---------- */
.badge,.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  border:2px solid currentColor;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;line-height:1.5;
  white-space:nowrap;
}
.badge--beta{color:var(--amber);}
.badge--beta::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:currentColor;flex:none;
}
.tag--lime{color:var(--lime);}
.tag--orange{color:var(--orange);}
.tag--cyan{color:var(--cyan);}
.tag--mist{color:var(--mist);}

/* ---------- 7. 面板 / 章节 / 数据 ---------- */
.panel{
  border:2px solid var(--line);
  background:var(--board);
  padding:24px;
}
.panel--lime{border-color:var(--lime);}
.panel--orange{border-color:var(--orange);}
.panel--cyan{border-color:var(--cyan);}
.panel--paper{background:var(--paper);color:var(--ink);border-color:var(--ink);}
.panel--paper h2,.panel--paper h3{color:var(--ink);}
.hard{box-shadow:6px 6px 0 var(--grass);}

.chapter{
  display:grid;
  grid-template-columns:104px minmax(0,1fr);
  gap:24px;
  padding:44px 0;
  border-top:2px solid var(--line);
}
.chapter__num{
  font-family:var(--font-mono);
  font-size:clamp(2rem,4vw,3.2rem);
  line-height:1;
  font-weight:700;
  letter-spacing:-.04em;
  color:var(--orange);
  font-variant-numeric:tabular-nums;
}
.chapter__title{margin-bottom:12px;}
.chapter__body{color:var(--mist);}

.stat{display:flex;flex-direction:column;gap:6px;padding-left:16px;border-left:2px solid var(--orange);}
.stat__num{
  font-family:var(--font-mono);
  font-size:clamp(2rem,4.4vw,3.4rem);
  line-height:1;color:var(--lime);
  font-variant-numeric:tabular-nums;letter-spacing:-.03em;
}
.stat__unit{font-size:.42em;color:var(--mist);margin-left:6px;letter-spacing:.08em;}
.stat__label{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--mist);text-transform:uppercase;}

/* ---------- 8. 图片容器 ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  border:2px solid var(--line);
  background:var(--board);
  min-height:180px;
}
.media img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/9;}
.media--wide img{aspect-ratio:21/9;}
.media--square img{aspect-ratio:1/1;}
.media--tall img{aspect-ratio:4/5;}
.media__grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(47,224,220,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(47,224,220,.16) 1px,transparent 1px);
  background-size:40px 40px;
}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:12px 14px;
  background:linear-gradient(0deg,rgba(7,12,20,.94),rgba(7,12,20,0));
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--paper);
}

/* ---------- 9. 正文容器 / 面包屑 ---------- */
.prose{max-width:68ch;font-size:17px;line-height:1.75;}
.prose > * + *{margin-top:1.2em;}
.prose h2{margin-top:2em;font-size:clamp(1.4rem,2.6vw,2rem);}
.prose h3{margin-top:1.6em;font-size:clamp(1.15rem,2vw,1.4rem);}
.prose ul li,.prose ol li{position:relative;padding-left:22px;margin-top:.5em;}
.prose ul li::before{
  content:"";position:absolute;left:0;top:.75em;
  width:10px;height:2px;background:var(--orange);
}
.prose ol{counter-reset:prose;}
.prose ol li{counter-increment:prose;}
.prose ol li::before{
  content:counter(prose,decimal-leading-zero);
  position:absolute;left:0;top:0;
  font-family:var(--font-mono);font-size:13px;color:var(--orange);
}
.prose a{color:var(--lime);border-bottom:2px solid rgba(200,255,61,.4);}
.prose a:hover{border-bottom-color:var(--lime);}
.prose blockquote{
  border-left:2px solid var(--cyan);padding-left:20px;
  color:var(--mist);font-size:1.05em;
}
.prose code{
  font-family:var(--font-mono);font-size:.9em;
  background:var(--board);border:2px solid var(--line);padding:2px 6px;
}
html[data-reading="paper"] .prose{
  background:var(--paper);color:var(--ink);
  padding:32px 32px 12px;
  border:2px solid var(--ink);
  box-shadow:6px 6px 0 rgba(7,12,20,.6);
}
html[data-reading="paper"] .prose h2,
html[data-reading="paper"] .prose h3,
html[data-reading="paper"] .prose strong{color:var(--ink);}
html[data-reading="paper"] .prose a{color:var(--board);border-bottom-color:rgba(16,26,40,.45);}
html[data-reading="paper"] .prose code{background:rgba(7,12,20,.07);border-color:rgba(7,12,20,.25);}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--mist);margin-bottom:24px;
}
.breadcrumb a:hover{color:var(--lime);}
.breadcrumb__sep{color:var(--orange);}

/* ---------- 10. 显现动效 ---------- */
.reveal{opacity:0;transform:translateY(8px);transition:opacity .5s ease,transform .5s ease;}
.reveal.is-visible{opacity:1;transform:none;}

/* ---------- 11. 页头 ---------- */
.site-header{
  position:fixed;left:0;right:0;top:0;z-index:80;
  background:linear-gradient(180deg,rgba(7,12,20,.94) 0%,rgba(7,12,20,.6) 62%,rgba(7,12,20,0) 100%);
  border-bottom:2px solid transparent;
  transition:background .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.site-header[data-scrolled]{
  background:var(--board);
  border-bottom-color:var(--line-strong);
  box-shadow:0 12px 30px rgba(0,0,0,.45);
}
.header__shell{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:24px;
  min-height:var(--header-h);
  transition:min-height .3s ease;
}
.site-header[data-scrolled] .header__shell{min-height:var(--header-h-scrolled);}

.skip-link{
  position:absolute;left:12px;top:-120px;z-index:120;
  padding:10px 16px;
  background:var(--lime);color:var(--ink);
  font-weight:700;font-size:14px;
  border:2px solid var(--ink);
  transition:top .2s ease;
}
.skip-link:focus{top:10px;}

.brand{display:flex;align-items:center;gap:12px;min-width:0;}
.brand__mark{display:flex;align-items:center;gap:10px;min-width:0;}
.brand__glyph{
  display:grid;place-items:center;flex:none;
  width:38px;height:38px;
  background:var(--lime);color:var(--ink);
  font-family:var(--font-mono);font-size:14px;font-weight:700;letter-spacing:.02em;
  border:2px solid var(--grass);
  box-shadow:4px 4px 0 var(--grass);
}
.brand__names{display:flex;flex-direction:column;line-height:1.15;min-width:0;}
.brand__name{
  font-family:var(--font-display);font-weight:900;font-size:17px;
  letter-spacing:.02em;color:var(--white);white-space:nowrap;
}
.brand__sub{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--cyan);text-transform:uppercase;white-space:nowrap;
}

.nav{display:flex;justify-content:center;min-width:0;}
.nav__list{display:flex;align-items:center;gap:2px;}
.nav__item{display:block;}
.nav__link{
  position:relative;display:block;
  padding:8px 12px;
  font-size:15px;font-weight:600;color:var(--mist);
  border:2px solid transparent;
  white-space:nowrap;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.nav__link:hover{color:var(--white);border-color:var(--line-strong);}
.nav__link[aria-current="page"]{color:var(--lime);}
.nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;
  height:2px;background:var(--lime);
}
.nav__item--cta{display:none;}
.nav__link--cta{
  color:var(--ink);background:var(--lime);border-color:var(--lime);
  text-align:center;font-weight:800;
}

.header__actions{display:flex;align-items:center;gap:12px;flex:none;}
.header__cta{white-space:nowrap;}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 11px;
  border:2px solid var(--line-strong);
  color:var(--white);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  transition:border-color .2s ease,color .2s ease;
}
.nav-toggle:hover{border-color:var(--lime);color:var(--lime);}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:var(--lime);}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--lime);
  transition:transform .22s ease;
}
.nav-toggle__bars::before{top:-6px;}
.nav-toggle__bars::after{top:6px;}
.site-header[data-open] .nav-toggle__bars{background:transparent;}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg);}

.trackline{
  height:3px;
  background:repeating-linear-gradient(90deg,var(--orange) 0 18px,transparent 18px 36px);
  opacity:0;
  transition:opacity .3s ease;
}
.site-header[data-scrolled] .trackline{opacity:.6;}

/* ---------- 12. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--board);
  border-top:2px solid var(--lime);
}
.footer__stripe{
  height:6px;
  background:repeating-linear-gradient(90deg,var(--orange) 0 28px,transparent 28px 56px);
  opacity:.7;
}
.footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,2fr);
  gap:48px;
  padding-top:64px;
  padding-bottom:44px;
}
.footer__brand{min-width:0;}
.footer__tagline{
  margin-top:20px;
  font-family:var(--font-display);font-weight:800;
  font-size:19px;line-height:1.5;color:var(--white);
  max-width:24ch;
}
.footer__signoff{
  margin-top:12px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;
  color:var(--lime);max-width:30ch;line-height:1.7;
}
.footer__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:32px;
}
.footer__col{min-width:0;}
.footer__col-title{
  font-family:var(--font-mono);font-weight:700;
  font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--lime);margin-bottom:14px;
}
.footer__links{display:flex;flex-direction:column;gap:10px;}
.footer__link{
  display:inline-block;
  font-size:15px;color:var(--mist);
  border-bottom:2px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer__link:hover{color:var(--white);border-bottom-color:var(--orange);}

.footer__contact{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
  padding-top:28px;
  padding-bottom:28px;
  border-top:2px solid var(--line);
  border-bottom:2px solid var(--line);
}
.footer__contact-item{display:flex;flex-direction:column;gap:6px;max-width:36ch;}
.footer__contact-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--orange);
}
.footer__contact-value{font-size:15px;color:var(--paper);line-height:1.6;}
.footer__contact-note{font-family:var(--font-mono);font-size:12px;color:var(--mist);}

.footer__base{background:var(--ink);border-top:2px solid var(--line);}
.footer__base-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 32px;
  padding-top:20px;
  padding-bottom:20px;
}
.footer__legal,.footer__year{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--mist);max-width:none;
}

/* ---------- 13. 底部通勤快捷栏 ---------- */
.quickbar{
  position:fixed;left:0;right:0;bottom:0;z-index:90;
  background:rgba(7,12,20,.96);
  border-top:2px solid var(--lime);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
}
.quickbar__track{
  position:absolute;left:0;right:0;top:-2px;height:2px;
  background:rgba(157,170,185,.22);
  overflow:hidden;
}
.quickbar__track span{
  display:block;width:100%;height:100%;
  background:var(--cyan);
  transform:scaleX(0);transform-origin:0 50%;
}
.quickbar__inner{
  display:flex;align-items:center;gap:2px;
  min-height:var(--quickbar-h);
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.quickbar__link{
  flex:1 1 auto;
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:8px 14px;
  border:2px solid transparent;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;
  color:var(--mist);white-space:nowrap;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.quickbar__link:hover{color:var(--white);border-color:var(--line-strong);}
.quickbar__link[aria-current="page"]{background:var(--lime);border-color:var(--lime);color:var(--ink);}
.quickbar__link--btn{font-family:var(--font-mono);}
.quickbar__link[aria-pressed="true"]{color:var(--cyan);border-color:var(--cyan);}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1080px){
  .header__shell{grid-template-columns:1fr auto;gap:12px;}
  .nav{
    position:absolute;
    top:100%;left:0;right:0;
    display:none;
    flex-direction:column;justify-content:flex-start;
    background:var(--ink);
    border-top:2px solid var(--line);
    border-bottom:2px solid var(--lime);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    padding:10px var(--edge) 22px;
  }
  .site-header[data-open] .nav{display:flex;}
  .nav__list{flex-direction:column;align-items:stretch;gap:0;width:100%;}
  .nav__item{width:100%;}
  .nav__link{
    padding:15px 10px;
    font-size:18px;
    border:0;
    border-bottom:2px solid var(--line);
  }
  .nav__link:hover{border-color:var(--line);background:rgba(157,170,185,.06);}
  .nav__link[aria-current="page"]::after{display:none;}
  .nav__link[aria-current="page"]{background:rgba(200,255,61,.1);padding-left:16px;}
  .nav__item--cta{display:block;margin-top:16px;}
  .nav__link--cta{
    padding:16px 14px;font-size:16px;font-weight:800;
    background:var(--lime);color:var(--ink);border:2px solid var(--lime);
    text-align:center;box-shadow:4px 4px 0 var(--grass);
  }
  .nav__link--cta:hover{background:var(--lime);color:var(--ink);border-color:var(--grass);}
  .nav-toggle{display:inline-flex;}
  .header__cta{display:none;}
}

@media (max-width:900px){
  :root{--header-h:64px;--header-h-scrolled:56px;}
  .section{padding-top:64px;padding-bottom:64px;}
  .split{grid-template-columns:1fr;gap:24px;}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr));}
  .chapter{grid-template-columns:1fr;gap:10px;padding:36px 0;}
  .chapter__num{font-size:2rem;}
  .footer__grid{grid-template-columns:1fr;gap:36px;padding-top:48px;padding-bottom:32px;}
  .footer__cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;}
  .footer__contact{grid-template-columns:1fr;gap:20px;}
  .media img{aspect-ratio:16/10;}
  .media--wide img{aspect-ratio:16/9;}
}

@media (max-width:640px){
  :root{--gutter:20px;--quickbar-h:50px;}
  body{font-size:16px;}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr;}
  .footer__cols{grid-template-columns:1fr;}
  .footer__base-inner{justify-content:flex-start;}
  .brand__name{font-size:16px;}
  .quickbar__link{font-size:12px;padding:8px 10px;}
  .panel{padding:18px;}
  .btn{padding:12px 18px;font-size:14px;}
  html[data-reading="paper"] .prose{padding:22px 20px 8px;}
}

/* ---------- 15. 动效可及性 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .reveal{opacity:1;transform:none;}
}