/* ============================================================
   一体育官网 · /assets/site.css
   共享外壳：reset、变量、中文排版、头部轨道、页脚刻度、通用组件
   ============================================================ */

:root{
  --ink:#0A1F33;
  --ink-soft:rgba(10,31,51,.92);
  --field:#0B6E4F;
  --signal:#FF6B1A;
  --paper:#F4EEE3;
  --mist:#E8ECEF;
  --brown:#241C17;
  --slate:#4A6172;
  --mint:#7FD1AE;
  --rule:#D9C7A7;
  --alert:#B23A2E;

  --rail-w:88px;
  --toolbar-h:40px;

  --radius-sm:14px;
  --radius:24px;
  --radius-lg:40px;

  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-num:"Barlow Condensed","Oswald","Roboto Condensed","Arial Narrow","Noto Sans SC",system-ui,sans-serif;

  --edge:clamp(20px,4vw,56px);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  background:var(--paper);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
body{
  margin:0;
  padding-left:var(--rail-w);
  padding-top:var(--toolbar-h);
  background:transparent;
  color:var(--brown);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  min-height:100vh;
}
/* 蓝图坐标网格：常驻底层，低透明度 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(to right, rgba(217,199,167,.20) 0 1px, transparent 1px calc(100% / 12)),
    repeating-linear-gradient(to bottom, rgba(217,199,167,.10) 0 1px, transparent 1px 96px);
  opacity:.75;
}
img,svg,video{max-width:100%;display:block}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
h1,h2,h3,h4{font-weight:400;line-height:1.16;letter-spacing:.005em}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
a:hover{color:var(--signal)}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

:focus-visible{
  outline:2px solid var(--signal);
  outline-offset:3px;
  border-radius:6px;
}
::selection{background:var(--signal);color:var(--ink)}

/* ---------- 排版 ---------- */
.display-1{
  font-size:clamp(3.2rem,8.5vw,8.5rem);
  font-weight:300;
  line-height:.98;
  letter-spacing:.01em;
  color:var(--brown);
}
.display-2{
  font-size:clamp(1.9rem,4vw,3.4rem);
  font-weight:300;
  line-height:1.1;
  letter-spacing:.01em;
}
.eyebrow,.index-tag{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.16em;
  line-height:1.4;
  color:var(--slate);
  text-transform:uppercase;
}
.index-tag--signal{color:var(--signal);border:1px solid currentColor;border-radius:999px;padding:2px 10px}
.index-tag--mint{color:var(--field)}
.num{
  font-family:var(--font-num);
  font-weight:600;
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
  line-height:1;
}
.num-unit{
  font-family:var(--font-num);
  font-size:.42em;
  font-weight:500;
  letter-spacing:.06em;
  margin-left:.12em;
  color:var(--slate);
}
.prose{
  max-width:34em;
  font-size:17px;
  line-height:1.85;
}
.prose p + p{margin-top:1.2em}
.prose h3{font-size:18px;margin:1.8em 0 .7em;letter-spacing:.04em}
.lede{
  max-width:32em;
  font-size:clamp(1rem,1.4vw,1.15rem);
  line-height:1.9;
  color:var(--slate);
}
.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;
}

/* ---------- 容器与栅格 ---------- */
.container{
  width:100%;
  max-width:1240px;
  margin:0 auto;
  padding-left:var(--edge);
  padding-right:var(--edge);
}
.container--wide{max-width:1560px}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.grid-12 > *{grid-column:1 / -1}
@media (min-width:1024px){
  .col-2{grid-column:span 2}
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
  .col-9{grid-column:span 9}
  .col-12{grid-column:span 12}
}
.band{padding:clamp(40px,7vw,96px) 0}
.band--dark{background:var(--ink);color:var(--mist)}
.band--paper{background:var(--paper);color:var(--brown)}
.rule{
  height:1px;
  border:0;
  margin:clamp(28px,5vw,64px) 0;
  background:linear-gradient(90deg,var(--rule) 0%,rgba(217,199,167,.16) 60%,transparent 100%);
}
.tick-band{
  display:block;
  height:12px;
  background-image:repeating-linear-gradient(90deg,var(--rule) 0 1px,transparent 1px 32px);
  opacity:.5;
}

/* ---------- 按钮 / 胶囊 / 标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  padding:12px 22px;
  border-radius:999px;
  font-size:14px;
  letter-spacing:.08em;
  line-height:1.2;
  border:1px solid transparent;
  cursor:pointer;
  transition:background-color .22s ease,color .22s ease,border-color .22s ease,transform .22s ease;
}
.btn--signal{background:var(--signal);color:var(--ink);font-weight:500}
.btn--signal:hover{background:#ff8342;color:var(--ink)}
.btn--ghost{border-color:rgba(217,199,167,.5);color:var(--mist)}
.btn--ghost:hover{border-color:var(--mint);color:var(--mint)}
.btn--quiet{color:var(--field);border-color:rgba(11,110,79,.35)}
.btn--quiet:hover{background:var(--field);color:var(--paper);border-color:var(--field)}

.pill{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:8px 16px;
  border-radius:999px;
  border:1px solid rgba(217,199,167,.6);
  background:transparent;
  font-size:13px;
  letter-spacing:.08em;
  color:var(--slate);
  cursor:pointer;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.pill:hover{border-color:var(--field);color:var(--field)}
.pill[aria-pressed="true"]{
  background:var(--field);
  border-color:var(--field);
  color:var(--paper);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:3px 10px;
  border-radius:999px;
  font-size:11px;
  letter-spacing:.14em;
  border:1px solid currentColor;
  color:var(--field);
}
.tag--alert{color:var(--alert)}
.tag--signal{color:var(--signal)}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.7em;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--slate);
  padding:18px 0 0;
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.7em}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  color:var(--rule);
  letter-spacing:0;
}
.breadcrumb__item a:hover{color:var(--signal)}

/* ---------- 面板 / 数据簇 ---------- */
.panel{
  background:var(--paper);
  border-radius:var(--radius-lg);
  padding:clamp(24px,3.4vw,48px);
}
.panel--dark{
  background:var(--ink);
  color:var(--mist);
  box-shadow:0 30px 70px -56px rgba(10,31,51,.9);
}
.panel--bleed{
  width:100vw;
  max-width:none;
  margin-left:calc(50% - 50vw);
  border-radius:0;
}
.stat{display:flex;flex-direction:column;gap:.4em}
.stat__num{
  font-family:var(--font-num);
  font-weight:600;
  font-size:clamp(2.2rem,4.6vw,3.6rem);
  line-height:1;
  letter-spacing:.01em;
  font-variant-numeric:tabular-nums;
}
.stat__label{
  font-size:11px;
  letter-spacing:.16em;
  color:var(--slate);
}
.stat--signal .stat__num{color:var(--signal)}
.stat--mint .stat__num{color:var(--mint)}

/* ---------- 媒体容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  border-radius:var(--radius);
  background:var(--ink);
  isolation:isolate;
}
.media img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media--wide{aspect-ratio:16 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--pan{aspect-ratio:21 / 9;border-radius:var(--radius-lg)}
.media--placeholder{
  background:
    repeating-linear-gradient(90deg, rgba(217,199,167,.22) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(217,199,167,.14) 0 1px, transparent 1px 48px),
    linear-gradient(160deg,#0A1F33 0%,#0B6E4F 100%);
}
.media--placeholder::after{
  content:attr(data-label);
  position:absolute;
  left:18px;
  bottom:14px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--mint);
}
.media__caption{
  margin-top:.75em;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--slate);
}

/* ---------- 可展开内容组 ---------- */
.accordion{border-top:1px solid rgba(217,199,167,.5)}
.accordion__item{border-bottom:1px solid rgba(217,199,167,.5)}
.accordion__trigger{
  width:100%;
  display:flex;
  align-items:baseline;
  gap:16px;
  padding:20px 0;
  text-align:left;
  cursor:pointer;
}
.accordion__idx{
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--slate);
  transition:color .22s ease;
}
.accordion__label{
  flex:1;
  font-size:16px;
  letter-spacing:.02em;
}
.accordion__trigger:hover .accordion__label{color:var(--field)}
.accordion__trigger[aria-expanded="true"] .accordion__idx{color:var(--signal)}
.accordion__panel{
  padding:0 0 24px 32px;
  font-size:16px;
  line-height:1.85;
  color:var(--slate);
}
.accordion__meta{
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--mint);
}

/* ---------- 章节收尾索引条 ---------- */
.chapter-nav{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:22px 0;
  border-top:1px solid rgba(217,199,167,.5);
  border-bottom:1px solid rgba(217,199,167,.5);
  font-size:13px;
  letter-spacing:.08em;
}
.chapter-nav__link{color:var(--field)}
.chapter-nav__link:hover{color:var(--signal)}
.chapter-nav__current{
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--slate);
}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:50%;
  transform:translate(-50%,-180%);
  z-index:200;
  padding:10px 20px;
  border-radius:999px;
  background:var(--signal);
  color:var(--ink);
  font-size:13px;
  letter-spacing:.1em;
  transition:transform .2s ease;
}
.skip-link:focus{transform:translate(-50%,0);color:var(--ink)}

/* ---------- 头部：轨道 + 工具条 ---------- */
.site-header{position:relative}
.rail{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--rail-w);
  z-index:60;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:18px;
  padding:18px 0 20px;
  background:var(--ink);
  color:var(--mist);
  border-right:1px solid rgba(217,199,167,.22);
}
.rail__brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:10px;
  color:var(--mist);
}
.rail__brand:hover{color:var(--mist)}
.rail__mark{
  width:26px;height:26px;
  border-radius:50%;
  background:linear-gradient(140deg,var(--signal) 0%,var(--field) 100%);
  box-shadow:0 0 0 1px rgba(217,199,167,.45),0 0 22px -6px rgba(255,107,26,.7);
}
.rail__brand-name{
  writing-mode:vertical-rl;
  font-size:12px;
  letter-spacing:.3em;
  color:var(--mist);
}
.rail__nav{
  flex:1;
  width:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:0;
}
.rail__list{
  width:100%;
  display:flex;
  flex-direction:column;
  gap:4px;
}
.rail__item{width:100%}
.rail__link{
  position:relative;
  width:100%;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:5px;
  padding:9px 4px;
  border-radius:var(--radius-sm);
  color:rgba(232,236,239,.62);
  transition:color .22s ease,background-color .22s ease;
}
.rail__link:hover{
  color:var(--mist);
  background:rgba(127,209,174,.09);
}
.rail__idx{
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(127,209,174,.72);
}
.rail__label{
  writing-mode:vertical-rl;
  font-size:13px;
  letter-spacing:.22em;
}
.rail__link[aria-current="page"]{color:var(--signal)}
.rail__link[aria-current="page"] .rail__idx{color:var(--signal)}
.rail__link[aria-current="page"]::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:3px;
  height:22px;
  transform:translateY(-50%);
  border-radius:0 3px 3px 0;
  background:var(--signal);
}
.rail__stamp{
  font-family:var(--font-num);
  font-size:10px;
  line-height:1.7;
  letter-spacing:.18em;
  text-align:center;
  color:rgba(232,236,239,.4);
}

.nav-toggle{
  display:none;
  position:fixed;
  top:6px;
  left:12px;
  z-index:80;
  align-items:center;
  gap:8px;
  height:28px;
  padding:0 12px;
  border-radius:999px;
  border:1px solid rgba(217,199,167,.4);
  background:rgba(10,31,51,.88);
  color:var(--mist);
  font-size:11px;
  letter-spacing:.16em;
  cursor:pointer;
}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:14px;
  height:8px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;right:0;
  height:1px;
  background:var(--signal);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}

.toolbar{
  position:fixed;
  top:0;
  left:var(--rail-w);
  right:0;
  z-index:70;
  height:var(--toolbar-h);
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  padding:0 clamp(16px,3vw,48px);
  background:var(--ink-soft);
  border-bottom:1px solid rgba(217,199,167,.22);
  color:var(--mist);
  font-size:12px;
  letter-spacing:.14em;
  transition:height .24s ease;
}
.toolbar__chapter{display:inline-flex;align-items:center;gap:8px}
.toolbar__label{color:rgba(232,236,239,.5);font-size:11px;letter-spacing:.16em}
.toolbar__num{
  font-family:var(--font-num);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--signal);
}
.toolbar__sep{
  width:1px;
  height:14px;
  background:rgba(217,199,167,.35);
}
.toolbar__meta{color:rgba(232,236,239,.62)}
.toolbar__link{
  margin-left:auto;
  color:var(--mint);
  font-size:12px;
  letter-spacing:.14em;
}
.toolbar__link:hover{color:var(--signal)}
.toolbar__progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  background:linear-gradient(90deg,var(--field),var(--signal));
  transition:transform .12s linear;
}
body[data-scrolled="true"] .toolbar{height:32px}

.nav-scrim{
  position:fixed;
  inset:0;
  z-index:75;
  display:none;
  background:var(--ink-soft);
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,120px);
  padding:clamp(44px,6vw,84px) 0 28px;
  background:var(--ink);
  color:var(--mist);
}
.site-footer .tick-band{
  position:absolute;
  top:0;left:0;right:0;
  background-image:repeating-linear-gradient(90deg,rgba(217,199,167,.55) 0 1px,transparent 1px 34px);
  opacity:.6;
}
.footer__grid{
  display:grid;
  grid-template-columns:1.4fr .8fr .8fr 1.3fr;
  gap:clamp(24px,3vw,52px);
}
.footer__col{min-width:0}
.footer__brand{
  font-size:22px;
  letter-spacing:.14em;
  color:var(--mist);
}
.footer__brand-note{
  margin-top:.5em;
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mint);
}
.footer__note{
  margin-top:1.2em;
  max-width:30em;
  font-size:14px;
  line-height:1.9;
  color:rgba(232,236,239,.62);
}
.footer__title{
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mint);
  padding-bottom:12px;
  margin-bottom:14px;
  border-bottom:1px solid rgba(217,199,167,.28);
}
.footer__list{display:flex;flex-direction:column;gap:8px}
.footer__link{
  font-size:14px;
  letter-spacing:.04em;
  color:rgba(232,236,239,.78);
  transition:color .2s ease;
}
.footer__link:hover{color:var(--signal)}
.footer__list--kv li{
  display:flex;
  flex-wrap:wrap;
  gap:6px 12px;
  align-items:baseline;
}
.footer__k{
  flex:0 0 4.6em;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--slate);
}
.footer__v{
  flex:1 1 12em;
  min-width:0;
  font-size:14px;
  line-height:1.7;
  color:rgba(232,236,239,.82);
  word-break:break-word;
}
.footer__statement{
  margin-top:18px;
  padding-top:14px;
  border-top:1px solid rgba(217,199,167,.22);
  font-size:13px;
  line-height:1.8;
  color:rgba(232,236,239,.6);
}
.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px clamp(16px,3vw,36px);
  margin-top:clamp(32px,5vw,56px);
  padding-top:20px;
  border-top:1px solid rgba(217,199,167,.28);
  font-size:12px;
  letter-spacing:.12em;
}
.footer__icp{color:rgba(232,236,239,.72)}
.footer__legal{display:flex;flex-wrap:wrap;gap:18px}
.footer__meta{margin-left:auto;color:rgba(232,236,239,.5)}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .footer__grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:1023px){
  :root{--rail-w:0px}
  body{padding-left:0}
  .toolbar{left:0;padding-left:64px;padding-right:16px;gap:12px}
  .toolbar__meta{display:none}
  .nav-toggle{display:inline-flex}

  .rail{
    width:min(300px,84vw);
    align-items:stretch;
    gap:0;
    padding:20px 18px 26px;
    transform:translateX(-100%);
    transition:transform .28s cubic-bezier(.4,0,.2,1);
    box-shadow:0 0 60px -20px rgba(0,0,0,.7);
  }
  .rail[data-open="true"],
  .rail__nav[data-open="true"]{transform:translateX(0)}
  .rail__brand{
    flex-direction:row;
    gap:12px;
    padding:4px 6px 18px;
    border-bottom:1px solid rgba(217,199,167,.24);
  }
  .rail__brand-name{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.22em;
  }
  .rail__nav{
    display:block;
    flex:1;
    overflow-y:auto;
    padding-top:16px;
  }
  .rail__list{gap:2px}
  .rail__link{
    flex-direction:row;
    justify-content:flex-start;
    align-items:center;
    gap:14px;
    padding:13px 14px;
    border-radius:16px;
  }
  .rail__label{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.14em;
  }
  .rail__link[aria-current="page"]{background:rgba(255,107,26,.1)}
  .rail__link[aria-current="page"]::before{
    left:auto;
    right:14px;
    top:50%;
    width:18px;
    height:2px;
    border-radius:2px;
    transform:translateY(-50%);
  }
  .rail__stamp{display:none}
  .nav-scrim[data-open="true"]{display:block}
}
@media (max-width:767px){
  body{font-size:16px;line-height:1.8}
  .footer__grid{grid-template-columns:1fr}
  .footer__meta{margin-left:0}
  .accordion__panel{padding-left:0}
  .chapter-nav{flex-direction:column;align-items:flex-start;gap:10px}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    transition-duration:.01ms !important;
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
  }
  .toolbar__progress{transition:none}
}