/* ==========================================================================
   云体育主站 · /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 头部 / 页脚 / 通用组件 / 响应式
   ========================================================================== */

/* ---------- 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{margin:0}
ul,ol{padding:0;list-style:none}
button{background:none;border:0;font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
img,svg,video,canvas{display:block;max-width:100%}
table{border-collapse:collapse}
:focus-visible{outline:2px solid var(--lime);outline-offset:2px;border-radius:2px}
::selection{background:var(--lime);color:var(--ink)}

/* ---------- 2. 变量 ---------- */
:root{
  --ink:#0B1418;
  --ink-green:#12332F;
  --mist:#9FC4C0;
  --teal:#24605C;
  --teal-deep:#1A4744;
  --orange:#F25C2A;
  --orange-deep:#CF4718;
  --blue:#2E7BFF;
  --lime:#C8F226;
  --paper:#F3EDE2;
  --white:#FFFFFF;
  --mono-gray:#8A9AA0;

  --line:rgba(159,196,192,.20);
  --line-strong:rgba(159,196,192,.42);

  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --wrap-max:1440px;
  --pad:clamp(1rem,3.2vw,3rem);
  --head-h:64px;
  --ease:cubic-bezier(.22,.61,.36,1);

  --surface:var(--ink);
  --grid-line:var(--line);
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  background:var(--ink);
  color:var(--white);
  font-family:var(--font-sans);
  font-size:clamp(.9375rem,.9rem + .18vw,1.0625rem);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

.display{
  font-family:var(--font-sans);
  font-weight:900;
  font-stretch:87.5%;
  letter-spacing:-.02em;
  line-height:.94;
  color:var(--paper);
  font-size:clamp(2.5rem,4.2vw + 1.1rem,6rem);
}
.h-sec{
  font-family:var(--font-sans);
  font-weight:900;
  font-stretch:87.5%;
  letter-spacing:-.015em;
  line-height:1.04;
  color:var(--paper);
  font-size:clamp(1.75rem,2.2vw + .8rem,3.25rem);
}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.03em;
}
.lead{
  color:var(--mist);
  font-size:clamp(1rem,.96rem + .2vw,1.125rem);
  line-height:1.8;
  max-width:44ch;
}
.prose{
  max-width:42ch;
  color:rgba(255,255,255,.86);
}
.prose p + p{margin-top:1em}
.band--mist .prose,.band--paper .prose{color:rgba(11,20,24,.84)}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.skip-link{
  position:absolute;left:var(--pad);top:0;z-index:200;
  transform:translateY(-130%);
  padding:.65rem 1rem;
  background:var(--lime);color:var(--ink);
  font-size:.8125rem;font-weight:500;letter-spacing:.04em;
  border-radius:0 0 2px 2px;
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 4. 容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap-max);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.wrap--narrow{max-width:820px}

/* ---------- 5. 色带 ---------- */
.band{
  position:relative;
  padding-block:clamp(3.5rem,7vw,7rem);
}
.band--ink{background:var(--ink);--surface:var(--ink);--grid-line:var(--line);color:var(--white)}
.band--green{background:var(--ink-green);--surface:var(--ink);--grid-line:var(--line);color:var(--white)}
.band--mist{background:var(--mist);--surface:#EDF3F1;--grid-line:rgba(11,20,24,.16);color:var(--ink)}
.band--paper{background:var(--paper);--surface:var(--white);--grid-line:rgba(11,20,24,.16);color:var(--ink)}
.band--mist .h-sec,.band--paper .h-sec{color:var(--ink-green)}
.band--mist .display,.band--paper .display{color:var(--ink-green)}
.band--mist .lead,.band--paper .lead{color:#2A4540}
.band--mist .tag,.band--paper .tag{border-color:rgba(11,20,24,.28);color:var(--ink-green)}
.band--mist .sec-head__lead,.band--paper .sec-head__lead{color:#2A4540}

/* ---------- 6. 章节头 ---------- */
.sec-head{
  display:grid;
  gap:.85rem;
  margin-bottom:clamp(1.75rem,3.4vw,3rem);
}
.sec-head__index{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:.75rem;
  letter-spacing:.14em;
  color:var(--orange);
}
.sec-head__title{
  font-family:var(--font-sans);
  font-weight:900;
  font-stretch:87.5%;
  letter-spacing:-.015em;
  line-height:1.04;
  color:var(--paper);
  font-size:clamp(1.75rem,2.2vw + .8rem,3.25rem);
}
.band--mist .sec-head__title,.band--paper .sec-head__title{color:var(--ink-green)}
.sec-head__lead{
  color:var(--mist);
  max-width:46ch;
  font-size:clamp(.9375rem,.92rem + .15vw,1.0625rem);
}

/* ---------- 7. 分屏与网格 ---------- */
.split{
  display:grid;
  grid-template-columns:minmax(200px,32fr) 68fr;
  gap:clamp(1.5rem,4vw,4rem);
  align-items:start;
}
.split--4-6{grid-template-columns:minmax(200px,40fr) 60fr}
.split__aside{position:sticky;top:116px}
.split__main{min-width:0}

.grid{
  display:grid;
  gap:1px;
  background:var(--grid-line);
  border:1px solid var(--grid-line);
}
.grid > *{background:var(--surface)}
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--4{grid-template-columns:repeat(4,1fr)}

/* ---------- 8. 卡片 ---------- */
.card{
  display:flex;
  flex-direction:column;
  gap:.65rem;
  padding:clamp(1.1rem,2vw,1.75rem);
  background:var(--surface);
  transition:background-color .25s var(--ease),box-shadow .25s var(--ease);
  box-shadow:inset 0 0 0 0 transparent;
}
.card:hover{box-shadow:inset 0 0 0 1px rgba(242,92,42,.75)}
.card__tag{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:.6875rem;
  letter-spacing:.12em;
  color:var(--orange);
}
.card__title{
  font-weight:900;
  font-stretch:87.5%;
  letter-spacing:-.01em;
  line-height:1.16;
  font-size:clamp(1.0625rem,1vw + .6rem,1.375rem);
  color:var(--paper);
}
.band--mist .card__title,.band--paper .card__title{color:var(--ink-green)}
.card__text{
  font-size:.875rem;
  line-height:1.72;
  color:var(--mist);
}
.band--mist .card__text,.band--paper .card__text{color:rgba(11,20,24,.72)}
.card__meta{
  margin-top:auto;
  padding-top:.6rem;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:.6875rem;
  letter-spacing:.06em;
  color:var(--mono-gray);
}

/* ---------- 9. 横向轨道 ---------- */
.rail{position:relative;border-block:1px solid var(--grid-line)}
.rail__track{
  display:flex;
  gap:1px;
  overflow-x:auto;
  scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}
.rail__track > *{flex:0 0 clamp(220px,26vw,320px);scroll-snap-align:start}

/* ---------- 10. 图像框景 ---------- */
.media-frame{
  position:relative;
  border:1px solid var(--line-strong);
  padding:10px;
  background:transparent;
}
.media-frame__inner{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  background:linear-gradient(135deg,var(--ink-green),var(--ink) 58%,var(--teal-deep));
  display:grid;
  place-items:center;
}
.media-frame__inner::after{
  content:"";
  position:absolute;inset:0;
  background-image:
    linear-gradient(var(--line) 1px,transparent 1px),
    linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:32px 32px;
  opacity:.6;
  pointer-events:none;
}
.media-frame__img{width:100%;height:100%;object-fit:cover}
.media-frame__cap{
  display:flex;align-items:center;gap:.6rem;
  margin-top:.65rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.05em;
  color:var(--mono-gray);
}
.media-frame__cap::before{
  content:"";flex:0 0 18px;height:1px;background:var(--orange);
}
.media-frame--wide .media-frame__inner{aspect-ratio:21/9}
.media-frame--tall .media-frame__inner{aspect-ratio:4/5}

/* ---------- 11. 面包屑 ---------- */
.crumbs{
  background:var(--ink);
  border-bottom:1px solid var(--line);
}
.crumbs__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  padding-block:.9rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.06em;
  color:var(--mono-gray);
}
.crumbs__list li + li::before{content:"/";margin-right:.5rem;color:var(--mono-gray);opacity:.7}
.crumbs__link{color:var(--mist);transition:color .2s var(--ease)}
.crumbs__link:hover{color:var(--lime)}

/* ---------- 12. 标签与按钮 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.2rem .5rem;
  border:1px solid var(--line-strong);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--mist);
}
.tag--lime{border-color:rgba(200,242,38,.55);color:var(--lime)}
.tag--orange{border-color:rgba(242,92,42,.6);color:var(--orange)}
.tag--teal{background:var(--teal);border-color:var(--teal);color:var(--paper)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.6rem 1rem;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-sans);
  font-size:.8125rem;
  font-weight:500;
  letter-spacing:.03em;
  cursor:pointer;
  transition:background-color .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease);
}
.btn--primary{background:var(--orange);color:var(--white)}
.btn--primary:hover{background:var(--orange-deep)}
.btn--ghost{border-color:var(--line-strong);color:var(--mist)}
.btn--ghost:hover{border-color:var(--lime);color:var(--lime)}

/* ---------- 13. 动效基元 ---------- */
.reveal{opacity:1;transform:none}
body[data-enhanced="true"] .reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .36s var(--ease),transform .36s var(--ease);
}
body[data-enhanced="true"] .reveal.is-visible{opacity:1;transform:none}

.reveal--line{height:1px;background:var(--grid-line);transform:none;opacity:1}
body[data-enhanced="true"] .reveal--line{
  opacity:1;
  clip-path:inset(0 100% 0 0);
  transition:clip-path .55s var(--ease);
}
body[data-enhanced="true"] .reveal--line.is-visible{clip-path:inset(0 0 0 0)}

/* ---------- 14. 头部外壳 ---------- */
.site-head{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(11,20,24,.96);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.site-head::before{
  content:"";
  position:absolute;inset:0 0 auto 0;height:2px;
  background:linear-gradient(90deg,var(--orange) 0 16%,var(--teal) 16% 74%,var(--lime) 74% 100%);
}

.cmdbar{position:relative}
.cmdbar__inner{
  display:flex;
  align-items:center;
  gap:clamp(.75rem,1.6vw,1.75rem);
  min-height:var(--head-h);
}

/* 品牌 */
.brand{
  position:relative;
  display:flex;
  align-items:center;
  gap:.7rem;
  padding-left:.85rem;
  flex-shrink:0;
}
.brand::before{
  content:"";
  position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:26px;background:var(--orange);
}
.brand__mark{
  font-weight:900;
  font-stretch:87.5%;
  letter-spacing:-.01em;
  font-size:1.0625rem;
  color:var(--white);
  white-space:nowrap;
}
.brand__tagline{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.06em;
  color:var(--mist);
  white-space:nowrap;
  padding-left:.7rem;
  border-left:1px solid var(--line-strong);
}
.brand__scale{display:flex;align-items:flex-end;gap:3px;height:16px}
.brand__scale i{display:block;width:1px;height:35%;background:var(--mist);opacity:.65}
.brand__scale i:nth-child(2){height:60%}
.brand__scale i:nth-child(3){height:100%}
.brand__scale i:nth-child(4){height:52%}
.brand__scale i:nth-child(5){height:82%}
.brand__scale i:nth-child(6){height:44%}

/* 命令栏导航 */
.cmdnav{margin-inline:auto}
.cmdnav__list{display:flex;align-items:center;gap:.1rem}
.cmdnav__link{
  position:relative;
  display:block;
  padding:.55rem .7rem;
  font-size:.8125rem;
  font-weight:500;
  letter-spacing:.02em;
  color:var(--mist);
  white-space:nowrap;
  transition:color .22s var(--ease);
}
.cmdnav__link::after{
  content:"";
  position:absolute;left:.7rem;right:.7rem;bottom:.3rem;height:2px;
  background:var(--lime);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .28s var(--ease),background-color .22s var(--ease);
}
.cmdnav__link:hover{color:var(--white)}
.cmdnav__link:hover::after{transform:scaleX(1);background:var(--orange)}
.cmdnav__link[aria-current="page"]{color:var(--white)}
.cmdnav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--lime)}

/* 右侧操作区 */
.cmdbar__actions{
  display:flex;align-items:center;gap:.6rem;flex-shrink:0;
}
.cmdbar__cta{white-space:nowrap}

.compat{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.45rem .62rem;
  border:1px solid var(--line-strong);
  border-radius:2px;
  font-size:.75rem;
  letter-spacing:.05em;
  color:var(--mist);
  cursor:pointer;
  white-space:nowrap;
  transition:color .22s var(--ease),border-color .22s var(--ease);
}
.compat__dot{
  width:7px;height:7px;border-radius:50%;
  border:1px solid currentColor;
  background:transparent;
  transition:background-color .22s var(--ease),box-shadow .22s var(--ease);
}
.compat:hover{color:var(--white);border-color:var(--white)}
.compat[aria-pressed="true"]{color:var(--lime);border-color:var(--lime)}
.compat[aria-pressed="true"] .compat__dot{
  background:var(--lime);border-color:var(--lime);
  box-shadow:0 0 0 3px rgba(200,242,38,.18);
}

.nav-toggle{
  display:none;
  position:relative;
  width:38px;height:34px;
  border:1px solid var(--line-strong);
  border-radius:2px;
  cursor:pointer;
}
.nav-toggle span{
  position:absolute;left:9px;right:9px;height:1.5px;
  background:var(--mist);
  transition:transform .24s var(--ease),opacity .18s var(--ease);
}
.nav-toggle span:nth-child(1){top:11px}
.nav-toggle span:nth-child(2){top:16px}
.nav-toggle span:nth-child(3){top:21px}
.nav-toggle:hover{border-color:var(--white)}
.nav-toggle:hover span{background:var(--white)}

/* 提示带 */
.rail-strip{
  background:var(--ink-green);
  border-top:1px solid var(--line);
}
.rail-strip__inner{
  display:flex;align-items:center;gap:.75rem;
  min-height:30px;
  font-size:.6875rem;
}
.rail-strip__module{
  font-family:var(--font-mono);
  letter-spacing:.1em;
  color:var(--lime);
  white-space:nowrap;
}
.rail-strip__scan{
  flex:0 0 54px;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(200,242,38,.9),transparent);
  background-size:200% 100%;
  animation:rail-scan 3s linear infinite;
}
@keyframes rail-scan{
  from{background-position:130% 0}
  to{background-position:-130% 0}
}
.rail-strip__meta{
  margin-left:auto;
  font-family:var(--font-mono);
  letter-spacing:.05em;
  color:var(--mono-gray);
  white-space:nowrap;
}

/* 兼容模式降级 */
body[data-compat="on"] .rail-strip__scan{animation:none;background:var(--lime);opacity:.85}
body[data-compat="on"] .site-head{backdrop-filter:none;background:var(--ink)}
body[data-compat="on"] .reveal{opacity:1;transform:none}
body[data-compat="on"] .reveal--line{clip-path:none}

/* ---------- 15. 页脚 ---------- */
.site-foot{
  position:relative;
  background:var(--ink);
  border-top:1px solid var(--line);
  padding-block:clamp(2.5rem,5vw,4rem) 1.6rem;
}
.foot-scale{
  height:12px;
  margin-bottom:clamp(1.75rem,3vw,2.75rem);
  background-image:repeating-linear-gradient(90deg,var(--line-strong) 0 1px,transparent 1px 24px);
  border-bottom:1px solid var(--line);
}
.foot-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.6fr;
  gap:clamp(1.25rem,3vw,3rem);
}
.foot-col{min-width:0}
.foot-col__title{
  margin-bottom:.9rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:400;
  letter-spacing:.14em;
  color:var(--mono-gray);
}
.foot-list{display:grid;gap:.45rem}
.foot-link{
  display:inline-block;
  font-size:.875rem;
  color:var(--mist);
  transition:color .2s var(--ease);
}
.foot-link:hover{color:var(--lime)}
.foot-brand{
  display:inline-block;
  font-weight:900;
  font-stretch:87.5%;
  letter-spacing:-.01em;
  font-size:1.25rem;
  color:var(--paper);
}
.foot-tagline{
  margin-top:.5rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.05em;
  color:var(--mist);
}
.foot-coord{
  margin-top:.9rem;
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--mono-gray);
}
.foot-contact{display:grid;gap:.55rem}
.foot-contact__line{
  display:flex;
  gap:.6rem;
  align-items:baseline;
  font-size:.8125rem;
  line-height:1.6;
  color:var(--mist);
}
.foot-contact__line b{
  flex:0 0 2.6em;
  font-family:var(--font-mono);
  font-weight:400;
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--mono-gray);
}
.foot-legal{
  display:flex;
  flex-wrap:wrap;
  gap:.5rem 1.5rem;
  margin-top:clamp(2rem,4vw,3rem);
  padding-top:1rem;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.04em;
  color:var(--mono-gray);
}

/* ---------- 16. 响应式 ---------- */
@media (max-width:1180px){
  .brand__scale{display:none}
  .cmdnav__link{padding:.5rem .55rem;font-size:.78rem}
}
@media (max-width:960px){
  :root{--head-h:58px}
  .brand__tagline{display:none}
  .nav-toggle{display:block}
  .cmdbar__inner{flex-wrap:nowrap}
  .cmdnav{
    position:absolute;
    left:0;right:0;top:100%;
    background:var(--ink);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    transition:max-height .3s var(--ease),visibility .3s var(--ease);
  }
  .cmdnav__list{
    display:block;
    padding:.4rem var(--pad) 1rem;
  }
  .cmdnav__link{
    padding:.75rem .2rem;
    font-size:.875rem;
    border-bottom:1px solid var(--line);
  }
  .cmdnav__link::after{left:.2rem;right:auto;width:24px;bottom:.55rem}
  [data-open="true"] .cmdnav{
    max-height:72vh;
    overflow-y:auto;
    visibility:visible;
  }
  [data-open="true"] .nav-toggle span:nth-child(1){transform:translateY(5px) rotate(45deg)}
  [data-open="true"] .nav-toggle span:nth-child(2){opacity:0}
  [data-open="true"] .nav-toggle span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
  [data-open="true"] .nav-toggle span{background:var(--lime)}
  .rail-strip__scan{flex-basis:34px}
}
@media (max-width:1024px){
  .grid--4,.grid--3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  .split,.split--4-6{grid-template-columns:1fr;gap:1.75rem}
  .split__aside{position:static}
}
@media (max-width:768px){
  .foot-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .compat__text{display:none}
  .compat{padding:.45rem .5rem}
  .cmdbar__cta{padding:.5rem .7rem;font-size:.75rem}
  .rail-strip__meta{display:none}
  .foot-grid{grid-template-columns:1fr;gap:1.75rem}
  .card{padding:1.1rem}
}

/* ---------- 17. 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1 !important;transform:none !important}
  .reveal--line{clip-path:none !important}
  .rail-strip__scan{animation:none;background:var(--lime);opacity:.7}
}