/* =========================================================
   /assets/site.css — 星空体育入口 共享外壳样式
   深空数据舱 · 侧边轨道 · 切角面板 · 双色脉冲
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink-900:#050B1C;
  --ink-800:#0B1B3A;
  --ink-700:#16264A;
  --violet:#6C3FC5;
  --cyan:#00E5FF;
  --amber:#FF8A3D;
  --green:#2FD6A5;
  --line:#24406F;
  --text:#E8EDF7;
  --text-dim:#9AA9C4;

  --rail-w:250px;
  --bar-h:62px;
  --maxw:1180px;
  --pad-x:clamp(20px,4.5vw,64px);

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
  --cut:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
  --cut-sm:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
  --cut-tr:polygon(0 0,calc(100% - 16px) 0,100% 16px,100% 100%,0 100%);
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ol,ul{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--violet);color:#fff}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.btn:focus-visible,.nav-toggle:focus-visible,.to-top:focus-visible,.tag:focus-visible{
  outline:2px solid var(--cyan);outline-offset:-2px
}

/* ---------- 3. 基础排版 ---------- */
body{
  margin:0;
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(760px 560px at 82% -8%, rgba(108,63,197,.32), transparent 68%),
    radial-gradient(620px 480px at 4% 38%, rgba(0,229,255,.10), transparent 72%),
    radial-gradient(540px 440px at 96% 92%, rgba(255,138,61,.10), transparent 74%);
  background-attachment:fixed;
  color:var(--text);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(36,64,111,.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36,64,111,.22) 1px, transparent 1px);
  background-size:88px 88px;
  -webkit-mask-image:radial-gradient(120% 92% at 50% 0%, #000 12%, transparent 76%);
  mask-image:radial-gradient(120% 92% at 50% 0%, #000 12%, transparent 76%);
}
main{position:relative;z-index:1;display:block}

h1,h2,h3,h4{font-weight:700;line-height:1.35;letter-spacing:.01em}
p{font-size:17px}
strong{font-weight:700;color:#fff}
a:hover{color:var(--cyan)}

.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;border:0;
  clip:rect(0 0 0 0);clip-path:inset(50%);
  overflow:hidden;white-space:nowrap;
}

@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
}

/* ---------- 4. 容器与章节骨架 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}

.chapter{position:relative;padding-top:clamp(72px,9vw,140px)}
.chapter-head{max-width:900px;display:grid;gap:0 24px}
.chapter-num{
  display:block;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(56px,7vw,84px);
  line-height:.86;
  letter-spacing:-.03em;
  color:transparent;
  -webkit-text-stroke:1.5px var(--violet);
  margin-bottom:18px;
}
.chapter-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(30px,4.4vw,44px);
  line-height:1.24;
  letter-spacing:.01em;
  color:#fff;
}
.chapter-lede{
  margin-top:16px;
  max-width:62ch;
  color:var(--text-dim);
}
@media (min-width:1024px){
  .chapter-head{grid-template-columns:190px minmax(0,1fr)}
  .chapter-num{grid-column:1;grid-row:1 / span 2;margin-bottom:0}
  .chapter-title{grid-column:2;grid-row:1}
  .chapter-lede{grid-column:2;grid-row:2}
}

.band{
  height:8px;
  margin-block:clamp(40px,5vw,72px);
  background:linear-gradient(90deg,var(--violet) 0%,#3B7BD4 48%,var(--cyan) 100%);
  clip-path:polygon(0 0,100% 0,calc(100% - 14px) 100%,0 100%);
  transform-origin:left center;
  transition:transform 1.05s var(--ease);
}
.band.is-off{transform:scaleX(.4)}

/* ---------- 5. 侧边轨道 / 页头 ---------- */
.site-rail{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--rail-w);
  z-index:60;
  display:flex;
  flex-direction:column;
  background:linear-gradient(180deg,#081126 0%,#0B1B3A 46%,#08152E 100%);
  border-right:1px solid var(--line);
}
.site-rail::after{
  content:"";
  position:absolute;
  top:0;right:-1px;
  width:1px;height:100%;
  background:linear-gradient(180deg,transparent 0%,var(--violet) 32%,var(--cyan) 70%,transparent 100%);
  opacity:.55;
}
.rail-inner{
  flex:1 1 auto;
  min-height:0;
  display:flex;
  flex-direction:column;
  gap:18px;
  padding:28px 22px 24px;
  overflow-y:auto;
  overscroll-behavior:contain;
}

.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  clip-path:var(--cut-sm);
  transform:translateY(-200%);
  transition:transform .25s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--ink-900)}

.brand{display:flex;align-items:center;gap:12px}
.brand-mark{
  position:relative;
  flex:0 0 auto;
  width:30px;height:30px;
  border:1.5px solid var(--cyan);
  border-radius:2px;
  transform:rotate(45deg);
}
.brand-mark::before{
  content:"";
  position:absolute;
  inset:7px;
  background:var(--violet);
  border-radius:1px;
  transition:background .3s var(--ease);
}
.brand:hover .brand-mark::before{background:var(--amber)}
.brand-text{display:block;min-width:0}
.brand-name{
  display:block;
  font-family:var(--font-display);
  font-weight:800;
  font-size:19px;
  line-height:1.25;
  letter-spacing:.02em;
  color:#fff;
}
.brand-sub{
  display:block;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.24em;
  color:var(--text-dim);
  text-transform:uppercase;
}

.nav-toggle{display:none}
.nav-toggle-icon{
  position:relative;
  display:block;
  width:15px;height:11px;
}
.nav-toggle-icon::before,
.nav-toggle-icon::after{
  content:"";
  position:absolute;
  left:0;right:0;
  height:1.5px;
  background:var(--cyan);
  transition:transform .3s var(--ease);
}
.nav-toggle-icon::before{top:1px}
.nav-toggle-icon::after{bottom:1px}

.rail-meta{display:grid;gap:10px}
.rail-status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  width:fit-content;
  padding:5px 11px;
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.5;
  letter-spacing:.02em;
  color:var(--amber);
  background:rgba(255,138,61,.10);
  border:1px solid rgba(255,138,61,.38);
  clip-path:var(--cut-sm);
}
.pulse-dot{
  flex:0 0 auto;
  width:7px;height:7px;
  border-radius:50%;
  background:var(--cyan);
  animation:pulse 3.2s var(--ease) infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(0,229,255,.55)}
  70%{box-shadow:0 0 0 9px rgba(0,229,255,0)}
  100%{box-shadow:0 0 0 0 rgba(0,229,255,0)}
}
.rail-tagline{font-size:13.5px;line-height:1.65;color:var(--text-dim)}

.rail-nav{
  flex:1 1 auto;
  display:flex;
  flex-direction:column;
  margin-top:4px;
}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-list a{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:11px 12px;
  border-left:2px solid transparent;
  border-radius:2px;
  font-size:15px;
  line-height:1.45;
  color:var(--text-dim);
  transition:color .25s var(--ease),background .25s var(--ease),border-color .25s var(--ease);
}
.nav-list a:hover{
  color:var(--text);
  background:rgba(0,229,255,.07);
}
.nav-idx{
  flex:0 0 auto;
  min-width:20px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--violet);
  transition:color .25s var(--ease);
}
.nav-list a:hover .nav-idx{color:var(--cyan)}
.nav-list a[aria-current="page"]{
  color:#fff;
  border-left-color:var(--cyan);
  background:linear-gradient(90deg,rgba(108,63,197,.34) 0%,rgba(0,229,255,.08) 68%,transparent 100%);
}
.nav-list a[aria-current="page"] .nav-idx{color:var(--cyan)}
.nav-label{display:block}

.rail-cta{margin-top:auto;padding-top:22px}

.rail-scrim{display:none}

.rail-progress{
  position:absolute;
  top:0;right:0;
  width:2px;height:100%;
  background:rgba(36,64,111,.45);
}
.rail-progress > span{
  display:block;
  width:100%;height:0;
  background:linear-gradient(180deg,var(--violet),var(--cyan));
  transition:height .12s linear;
}

/* ---------- 6. 按钮与徽章 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  font-size:14.5px;
  font-weight:500;
  line-height:1.25;
  color:var(--text);
  border:1px solid transparent;
  clip-path:var(--cut);
  cursor:pointer;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),transform .18s var(--ease);
}
.btn-primary{
  background:linear-gradient(120deg,#7B4CD8 0%,#00E5FF 100%);
  color:#04101F;
  font-weight:700;
}
.btn-primary:hover{color:#04101F;transform:translateY(-1px);filter:brightness(1.08)}
.btn-ghost{
  background:transparent;
  border-color:rgba(0,229,255,.55);
  color:var(--cyan);
}
.btn-ghost:hover{background:rgba(0,229,255,.12);color:var(--cyan)}
.btn-block{width:100%}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.5;
  color:var(--text-dim);
  background:rgba(22,38,74,.72);
  border:1px solid var(--line);
  clip-path:var(--cut-sm);
}
.tag--live{color:var(--green);border-color:rgba(47,214,165,.42)}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--cyan);
}

/* ---------- 7. 面板、网格、数据 ---------- */
.panel{
  position:relative;
  background:var(--ink-700);
  border:1px solid var(--line);
  padding:clamp(20px,3vw,32px);
  clip-path:var(--cut-tr);
  transition:background .3s var(--ease),border-color .3s var(--ease),transform .25s var(--ease);
}
.panel::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:0;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  transition:width .45s var(--ease);
}
.panel:hover{background:#1B2D57;border-color:rgba(0,229,255,.6);transform:translateY(-2px)}
.panel:hover::after{width:100%}

.grid{display:grid;gap:clamp(18px,2.4vw,28px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-split{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
@media (max-width:900px){
  .grid-2,.grid-3,.grid-split{grid-template-columns:minmax(0,1fr)}
}

.data-num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--cyan);
}
.data-num--amber{color:var(--amber)}

/* ---------- 8. 图片占位容器 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:linear-gradient(150deg,var(--ink-700) 0%,var(--ink-800) 100%);
  border:1px solid var(--line);
  clip-path:var(--cut-tr);
}
.media-frame > img{
  width:100%;height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(120% 90% at 12% 8%, rgba(108,63,197,.30), transparent 62%),
    radial-gradient(110% 80% at 92% 96%, rgba(0,229,255,.20), transparent 66%);
  mix-blend-mode:screen;
}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--wide{aspect-ratio:21/9}
@media (max-width:640px){
  .media-frame--wide{aspect-ratio:16/9}
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
  color:var(--text-dim);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";color:var(--violet);opacity:.85}
.breadcrumbs a:hover{color:var(--cyan)}

/* ---------- 10. 页脚 ---------- */
.site-foot{
  position:relative;
  z-index:1;
  margin-top:clamp(72px,9vw,132px);
  padding-block:clamp(56px,7vw,92px) 28px;
  background:linear-gradient(180deg,var(--ink-800) 0%,#081126 64%,var(--ink-900) 100%);
  border-top:1px solid var(--line);
  overflow:hidden;
}
.site-foot::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:6px;
  background:linear-gradient(90deg,var(--violet) 0%,var(--cyan) 58%,var(--amber) 100%);
  opacity:.92;
}
.site-foot::after{
  content:"";
  position:absolute;
  top:-30%;right:-12%;
  width:58%;height:172%;
  pointer-events:none;
  background:radial-gradient(closest-side, rgba(108,63,197,.30), transparent 72%);
  transform:rotate(14deg);
}

.foot-inner{
  position:relative;
  z-index:1;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--pad-x);
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,1.85fr);
  gap:clamp(32px,5vw,72px);
}
@media (max-width:980px){
  .foot-inner{grid-template-columns:minmax(0,1fr)}
}

.foot-wordmark{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(22px,2.6vw,28px);
  line-height:1.3;
  color:#fff;
}
.foot-domain{
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--cyan);
}
.foot-contact{display:grid;gap:10px;margin-top:22px}
.foot-contact li{
  display:grid;
  grid-template-columns:52px minmax(0,1fr);
  gap:12px;
  align-items:baseline;
  font-size:14px;
  line-height:1.7;
}
.foot-key{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--violet);
}
.foot-val{color:var(--text-dim);word-break:break-word}

.foot-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(22px,3vw,40px);
}
@media (max-width:760px){
  .foot-cols{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
}
.foot-col-title{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--text);
  padding-bottom:12px;
  margin-bottom:14px;
  border-bottom:1px solid var(--line);
}
.foot-list{display:grid;gap:10px}
.foot-list a{
  font-size:14.5px;
  color:var(--text-dim);
  transition:color .22s var(--ease),padding-left .22s var(--ease);
}
.foot-list a:hover{color:var(--cyan);padding-left:5px}

.foot-base{
  position:relative;
  z-index:1;
  max-width:var(--maxw);
  margin:clamp(36px,5vw,60px) auto 0;
  padding:22px var(--pad-x) 0;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  gap:16px 24px;
  align-items:center;
  justify-content:space-between;
}
.foot-legal{
  font-family:var(--font-mono);
  font-size:12.5px;
  line-height:1.7;
  letter-spacing:.01em;
  color:var(--text-dim);
}
.to-top{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 15px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--text-dim);
  border:1px solid var(--line);
  clip-path:var(--cut-sm);
  transition:color .25s var(--ease),border-color .25s var(--ease),background .25s var(--ease);
}
.to-top:hover{color:var(--cyan);border-color:rgba(0,229,255,.6);background:rgba(0,229,255,.08)}
.to-top-arrow{color:var(--cyan);line-height:1}

/* ---------- 11. 动效基元 ---------- */
[data-reveal]{
  transition:opacity .72s var(--ease),transform .72s var(--ease);
}
[data-reveal].is-hidden{
  opacity:0;
  transform:translateY(20px);
}

/* ---------- 12. 移动端：轨道收为抽屉 ---------- */
@media (max-width:1023px){
  .site-rail{
    position:sticky;
    top:0;left:0;right:0;bottom:auto;
    width:100%;
    height:auto;
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .site-rail::after{display:none}
  .rail-inner{
    flex-direction:row;
    align-items:center;
    gap:14px;
    min-height:var(--bar-h);
    padding:0 16px;
    overflow:visible;
  }
  .brand-sub{display:none}
  .brand-name{font-size:17px}
  .rail-meta{display:none}
  .rail-progress{display:none}

  .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:8px;
    margin-left:auto;
    padding:9px 13px;
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.1em;
    color:var(--text);
    border:1px solid var(--line);
    clip-path:var(--cut-sm);
    transition:border-color .25s var(--ease),color .25s var(--ease),background .25s var(--ease);
  }
  .nav-toggle:hover{border-color:rgba(0,229,255,.6);color:var(--cyan)}
  .nav-toggle-label{display:inline}

  .rail-nav{
    position:fixed;
    top:var(--bar-h);
    left:0;
    bottom:0;
    width:min(86vw,340px);
    margin-top:0;
    padding:20px 18px calc(24px + env(safe-area-inset-bottom));
    background:linear-gradient(180deg,#0B1B3A 0%,#071129 100%);
    border-right:1px solid var(--line);
    overflow-y:auto;
    overscroll-behavior:contain;
    transform:translateX(-102%);
    transition:transform .36s var(--ease);
    z-index:62;
  }
  .rail-nav .nav-list a{font-size:16px;padding:13px 12px}
  .rail-cta{padding-top:26px}

  .rail-scrim{
    display:block;
    position:fixed;
    inset:0;
    z-index:61;
    background:rgba(5,11,28,.7);
    opacity:0;
    visibility:hidden;
    transition:opacity .3s var(--ease),visibility .3s var(--ease);
  }

  .site-rail[data-open] .rail-nav{transform:translateX(0)}
  .site-rail[data-open] .rail-scrim{opacity:1;visibility:visible}
  .site-rail[data-open] .nav-toggle{border-color:rgba(0,229,255,.7);color:var(--cyan)}
  .site-rail[data-open] .nav-toggle-icon::before{transform:translateY(4.5px) rotate(45deg)}
  .site-rail[data-open] .nav-toggle-icon::after{transform:translateY(-4.5px) rotate(-45deg)}
}

@media (min-width:1024px){
  .nav-toggle{display:none}
  .rail-nav .nav-list a:hover{color:var(--text)}
}

/* ---------- 13. 无障碍动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .band,
  .band.is-off{transform:none}
  [data-reveal],
  [data-reveal].is-hidden{opacity:1;transform:none}
}