/* ============================================================
   完美体育看台 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

:root{
  --pitch-900:#06140F;
  --pitch-800:#0B241A;
  --pitch-700:#123C2C;
  --ink:#E8FFF6;
  --cyan:#7CF7D4;
  --mint:#0ED9A5;
  --flare:#FF5A36;
  --amber:#FFB020;
  --mist:#A9C3B8;
  --grid:#2A4840;
  --line:rgba(124,247,212,.20);
  --line-soft:rgba(169,195,184,.16);
  --wash:rgba(18,60,44,.42);
  --shell:1300px;
  --rail:300px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --gut:clamp(1rem,3.4vw,2.6rem);
  --font-sans:"Noto Sans SC","HarmonyOS Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","IBM Plex Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:7rem}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
main{display:block}

/* ---------- 2. 中文排版与底色 ---------- */
body{
  min-height:100vh;
  background-color:var(--pitch-900);
  background-image:
    radial-gradient(1100px 560px at 84% -8%, rgba(14,217,165,.10), transparent 62%),
    radial-gradient(760px 420px at -6% 4%, rgba(124,247,212,.07), transparent 58%),
    linear-gradient(to right, rgba(42,72,64,.30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42,72,64,.30) 1px, transparent 1px);
  background-size:auto,auto,76px 76px,76px 76px;
  background-repeat:no-repeat,no-repeat,repeat,repeat;
  background-position:0 0,0 0,0 0,0 0;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4{line-height:1.25;font-weight:800;letter-spacing:-.01em}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--ink)}
strong{font-weight:700}
::selection{background:var(--cyan);color:var(--pitch-900)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:1px}

/* ---------- 3. 通用容器与章节 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gut);
}
.section{padding-block:clamp(3rem,8vw,6rem)}
.section--tight{padding-block:clamp(2rem,5vw,3.5rem)}
.section__head{display:grid;gap:.7rem;max-width:64ch}
.section__eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mint);
}
.section__title{font-size:clamp(1.6rem,3vw,2.8rem);font-weight:800}
.section__lead{color:var(--mist);font-size:15px;max-width:56ch}

.rule{height:1px;border:0;margin:0;background:linear-gradient(90deg,var(--cyan),rgba(124,247,212,0) 72%)}

/* ---------- 4. 布局骨架 ---------- */
.layout-rail{
  display:grid;
  grid-template-columns:var(--rail) minmax(0,1fr);
  gap:clamp(1.5rem,4vw,3.5rem);
  align-items:start;
}
.rail{min-width:0}
.rail__sticky{position:sticky;top:6.5rem}
.grid{display:grid;gap:clamp(1rem,2.4vw,1.75rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

@media (max-width:1080px){
  .layout-rail{grid-template-columns:1fr}
  .rail__sticky{position:static;top:auto}
}
@media (max-width:1024px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .grid--2,.grid--3{grid-template-columns:1fr}
}

/* ---------- 5. 基础组件 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.7rem 1.15rem;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-sans);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn--primary{background:var(--flare);color:#1A0805;border-color:var(--flare)}
.btn--primary:hover{background:#FF7551;border-color:#FF7551;color:#1A0805}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn--ghost:hover{color:var(--cyan);border-color:var(--cyan);background:rgba(124,247,212,.08)}
.btn--sm{padding:.45rem .85rem;font-size:12px}
.btn--block{width:100%}

.chip{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.3rem .75rem;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
  text-decoration:none;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.chip:hover{color:var(--cyan);border-color:var(--cyan);background:rgba(124,247,212,.07)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.18rem .5rem;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--cyan);
}
.tag--flare{color:var(--flare);border-color:rgba(255,90,54,.45);background:rgba(255,90,54,.10)}
.tag--amber{color:var(--amber);border-color:rgba(255,176,32,.42);background:rgba(255,176,32,.08)}
.tag--mint{color:var(--mint);border-color:rgba(14,217,165,.42);background:rgba(14,217,165,.08)}

.num,.score{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:700;letter-spacing:0}
.score{font-size:clamp(1.4rem,2.6vw,2rem);font-weight:800;color:var(--ink)}

.panel{
  background:var(--wash);
  border:1px solid var(--line-soft);
  padding:clamp(1rem,2.2vw,1.5rem);
}
.panel--tick{border-left:2px solid var(--mint)}

.frame{
  position:relative;
  border:1px solid var(--line);
  background:rgba(11,36,26,.55);
  padding:clamp(1.25rem,3vw,2.5rem);
}
.frame::before,.frame::after{
  content:"";
  position:absolute;
  width:16px;height:16px;
  border:1px solid var(--cyan);
  pointer-events:none;
}
.frame::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.frame::after{bottom:-1px;right:-1px;border-left:0;border-top:0}

.breadcrumbs{font-size:12px;letter-spacing:.08em;color:var(--mist)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem}
.breadcrumbs li{display:flex;align-items:center;gap:.45rem}
.breadcrumbs li::after{content:"/";color:var(--grid)}
.breadcrumbs li:last-child::after{display:none}
.breadcrumbs a{color:var(--mist)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--ink)}

.prose{max-width:72ch;font-size:16px;line-height:1.9}
.prose h2{margin:2.4rem 0 .9rem;font-size:clamp(1.4rem,2.4vw,2rem);font-weight:800}
.prose h3{margin:1.8rem 0 .6rem;font-size:clamp(1.1rem,1.8vw,1.35rem);font-weight:700;color:var(--cyan)}
.prose p{margin:0 0 1.1rem;color:rgba(232,255,246,.86)}
.prose ul{margin:0 0 1.2rem}
.prose li{position:relative;padding-left:1.1rem;margin-bottom:.5rem;color:rgba(232,255,246,.86)}
.prose li::before{content:"";position:absolute;left:0;top:.9em;width:7px;height:1px;background:var(--cyan)}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(124,247,212,.4)}
.prose a:hover{color:var(--ink);border-color:var(--ink)}
.prose code{font-family:var(--font-mono);font-size:.92em;color:var(--mint)}

/* 表格 */
.data-table{width:100%;border-collapse:collapse;font-size:14px}
.data-table th,.data-table td{text-align:left;padding:.7rem .9rem;border-bottom:1px solid var(--line-soft)}
.data-table th{
  font-size:12px;
  font-weight:600;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--mist);
}
.data-table tbody tr:nth-child(odd){background:rgba(18,60,44,.38)}
.data-table td.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* 时间轴 */
.timeline{position:relative;padding-left:1.75rem}
.timeline::before{
  content:"";
  position:absolute;left:.3rem;top:.5rem;bottom:.5rem;width:1px;
  background:linear-gradient(var(--mint),var(--grid));
}
.timeline__item{position:relative;padding-bottom:1.5rem}
.timeline__item::before{
  content:"";
  position:absolute;left:-1.45rem;top:.62rem;
  width:8px;height:8px;border-radius:50%;
  background:var(--amber);
  box-shadow:0 0 0 3px rgba(255,176,32,.16);
}

/* 横向赛事走廊 */
.scroll-rail{position:relative}
.scroll-rail__track{
  display:flex;
  gap:clamp(.75rem,1.6vw,1.25rem);
  overflow-x:auto;
  overscroll-behavior-x:contain;
  scroll-snap-type:x proximity;
  padding-bottom:1rem;
  scrollbar-width:thin;
  scrollbar-color:var(--grid) transparent;
}
.scroll-rail__track > *{flex:0 0 clamp(240px,30vw,340px);scroll-snap-align:start}
.scroll-rail__track::-webkit-scrollbar{height:6px}
.scroll-rail__track::-webkit-scrollbar-track{background:transparent}
.scroll-rail__track::-webkit-scrollbar-thumb{background:var(--grid)}

/* 图片容器基础规则 */
.figure{display:block;margin:0}
.figure__media{
  position:relative;
  aspect-ratio:16/9;
  overflow:hidden;
  border:1px solid var(--line);
  background:
    linear-gradient(160deg,var(--pitch-700),var(--pitch-900));
}
.figure__media > img{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
}
.figure__media::after{
  content:"";
  position:absolute;inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(42,72,64,.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42,72,64,.55) 1px, transparent 1px);
  background-size:44px 44px;
  opacity:.55;
  mix-blend-mode:normal;
}
.figure--wide .figure__media{aspect-ratio:21/9}
.figure--tall .figure__media{aspect-ratio:4/5}
.figure__caption{
  margin-top:.6rem;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
}

/* 进入视口上浮 */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
}
html.js [data-reveal].is-visible{
  opacity:1;
  transform:none;
  transition:opacity .24s var(--ease),transform .24s var(--ease);
}

/* ---------- 6. 头部 ---------- */
.skip-link{
  position:absolute;
  top:-120px;
  left:var(--gut);
  z-index:200;
  padding:.6rem 1rem;
  background:var(--cyan);
  color:var(--pitch-900);
  font-size:13px;
  font-weight:700;
  border-radius:2px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:.6rem;color:var(--pitch-900)}

.site-header{
  position:sticky;
  top:0;
  z-index:60;
  padding:0 var(--gut);
  background:rgba(6,20,15,.94);
  border-bottom:1px solid var(--line-soft);
  box-shadow:0 16px 32px -28px rgba(0,0,0,.95);
}
.read-progress{
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:2px;
  z-index:5;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--mint),var(--cyan) 55%,var(--flare));
  will-change:transform;
}
.header-rail{
  max-width:var(--shell);
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:clamp(.75rem,2vw,1.5rem);
  padding:clamp(.5rem,1.2vw,.75rem) 0;
}
.header-actions{display:flex;align-items:center;gap:.5rem;flex:none}

.brand{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  color:var(--ink);
  text-decoration:none;
  padding-right:.4rem;
}
.brand:hover{color:var(--ink)}
.brand__mark{
  position:relative;
  flex:none;
  width:34px;height:34px;
  border:1px solid var(--cyan);
  background:linear-gradient(135deg,rgba(14,217,165,.38),rgba(6,20,15,0) 72%);
}
.brand__mark::after{
  content:"";
  position:absolute;
  inset:6px;
  border:1px solid rgba(124,247,212,.6);
  border-radius:50%;
}
.brand__text{display:flex;flex-direction:column;line-height:1.25}
.brand__name{font-size:17px;font-weight:800;letter-spacing:.02em}
.brand__tag{font-size:11px;letter-spacing:.08em;color:var(--mist)}

.site-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:.15rem}
.nav-link{
  display:inline-block;
  padding:.5rem .85rem;
  border:1px solid transparent;
  border-radius:999px;
  font-size:14px;
  letter-spacing:.02em;
  color:var(--mist);
  text-decoration:none;
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
}
.nav-link:hover{color:var(--ink);background:rgba(124,247,212,.10);border-color:var(--line)}
.nav-link[aria-current="page"]{
  color:var(--pitch-900);
  background:var(--cyan);
  border-color:var(--cyan);
  font-weight:700;
}

.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  flex:none;
  width:40px;height:40px;
  border:1px solid var(--line-soft);
  border-radius:2px;
  color:var(--ink);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:4px;width:18px}
.nav-toggle__bars span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .24s var(--ease),opacity .24s var(--ease);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.header-tags{
  max-width:var(--shell);
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:.5rem;
  padding:0 0 .65rem;
}
.header-tags__label{
  margin-right:.25rem;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--grid);
}

.nav-scrim{
  position:fixed;
  inset:0;
  z-index:55;
  background:rgba(3,11,8,.70);
  opacity:0;
  visibility:hidden;
  transition:opacity .25s var(--ease),visibility .25s var(--ease);
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,8vw,6rem);
  background:var(--pitch-800);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:min(260px,42%);
  height:2px;
  background:linear-gradient(90deg,var(--flare),transparent);
}
.footer-shell{
  max-width:var(--shell);
  margin:0 auto;
  padding:clamp(2.5rem,6vw,4rem) var(--gut) clamp(1.5rem,3vw,2.25rem);
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr;
  gap:clamp(1.5rem,4vw,3rem);
}
.footer-brand{display:grid;gap:1rem;align-content:start}
.footer-line{color:var(--mist);font-size:14px;max-width:38ch}
.footer-contact{display:grid;gap:.5rem}
.footer-contact li{
  display:flex;
  align-items:baseline;
  gap:.7rem;
  font-size:13px;
  color:var(--mist);
  line-height:1.7;
  word-break:break-word;
}
.footer-contact li > span:first-child{
  flex:none;
  min-width:3.4em;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mint);
}
.footer-note{
  font-size:12px;
  color:var(--grid);
  line-height:1.7;
  max-width:40ch;
}
.footer-col__title{
  margin-bottom:1rem;
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-links li{margin-bottom:.55rem}
.footer-links a{
  display:inline-flex;
  align-items:center;
  color:var(--mist);
  font-size:14px;
  transition:color .2s var(--ease);
}
.footer-links a::before{
  content:"";
  display:inline-block;
  width:8px;height:1px;
  margin-right:.55rem;
  background:var(--grid);
  transition:width .2s var(--ease),background-color .2s var(--ease);
}
.footer-links a:hover{color:var(--ink)}
.footer-links a:hover::before{width:18px;background:var(--cyan)}

.footer-base{
  max-width:var(--shell);
  margin:0 auto;
  padding:1.1rem var(--gut);
  border-top:1px solid var(--line-soft);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.5rem 1.5rem;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
}
.footer-base__hint{color:var(--grid)}

.to-top{
  position:fixed;
  right:clamp(1rem,3vw,2rem);
  bottom:clamp(1rem,3vw,2rem);
  z-index:80;
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.6rem .95rem;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(11,36,26,.94);
  color:var(--ink);
  font-size:12px;
  letter-spacing:.08em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.to-top[hidden]{display:none}
.to-top:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 8. 响应式 ---------- */
@media (max-width:980px){
  .header-tags{display:none}
  .nav-toggle{display:inline-flex}
  .brand__tag{display:none}

  .site-nav{
    position:fixed;
    top:0;right:0;bottom:0;
    z-index:70;
    width:min(86vw,340px);
    padding:5.5rem 1.25rem 2rem;
    background:var(--pitch-800);
    border-left:1px solid var(--line);
    overflow-y:auto;
    transform:translateX(103%);
    visibility:hidden;
    transition:transform .34s var(--ease),visibility .34s var(--ease);
  }
  .site-header[data-open] .site-nav{transform:translateX(0);visibility:visible}
  .site-header[data-open] .nav-scrim{opacity:1;visibility:visible}

  .nav-list{display:block}
  .nav-link{
    display:block;
    padding:.9rem .6rem;
    border-radius:0;
    font-size:15px;
    border-left:2px solid transparent;
    border-bottom:1px solid var(--line-soft);
  }
  .nav-link:hover,.nav-link:focus-visible{
    background:none;
    color:var(--cyan);
    border-top-color:transparent;
    border-right-color:transparent;
    border-left-color:var(--cyan);
  }
  .nav-link[aria-current="page"]{
    background:none;
    color:var(--cyan);
    border-left-color:var(--cyan);
    border-top-color:transparent;
    border-right-color:transparent;
    border-bottom-color:var(--line-soft);
  }
}

@media (max-width:820px){
  .footer-shell{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  body{background-size:auto,auto,48px 48px,48px 48px}
}

@media (max-width:700px){
  .header-actions .btn--primary{display:none}
}

@media (max-width:560px){
  .footer-shell{grid-template-columns:1fr}
  .footer-base{font-size:11px}
  .scroll-rail__track > *{flex-basis:min(78vw,300px)}
}

/* ---------- 9. 无障碍与减动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .scroll-rail__track{scroll-snap-type:none}
}

@media print{
  .site-header,.nav-scrim,.to-top,.read-progress{display:none !important}
  body{background:#fff;color:#111}
}