/* ==========================================================================
   风云体育官网 · 共享样式表  /assets/site.css
   语言：夜场深蓝基底 + 电光青轨迹 + 活力橙脉冲；切角面板；斜向网格
   ========================================================================== */

/* ---------- 0. 设计变量 ---------- */
:root{
  --c-ink:#061426;
  --c-panel:#0C2138;
  --c-band:#143A5C;
  --c-steel:#1E5C7A;
  --c-cyan:#16C8D8;
  --c-cyan-soft:#7FE7F0;
  --c-orange:#FF6A1F;
  --c-orange-soft:#FFB27A;
  --c-paper:#E7EDF2;
  --c-muted:#93A6B5;
  --c-alert:#E2453F;

  --rail:88px;
  --rail-top:58px;
  --gutter:24px;
  --pad-x:32px;
  --maxw:1280px;
  --cut:14px;

  --f-display:"Arial Narrow","Helvetica Neue","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --f-editorial:Georgia,"Songti SC","STSong","SimSun",serif;
  --f-body:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --f-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --t-64:clamp(34px,6vw,64px);
  --t-44:clamp(27px,4vw,44px);
  --t-30:clamp(22px,2.6vw,30px);
  --t-22:22px;
  --t-17:17px;
  --t-14:14px;

  --ease:200ms cubic-bezier(.4,0,.2,1);
  --cut-tr:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
  --cut-both:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--c-ink);
  background-image:
    radial-gradient(1100px 620px at 78% -12%, rgba(22,200,216,.10), transparent 62%),
    radial-gradient(900px 520px at -12% 104%, rgba(255,106,31,.08), transparent 60%),
    repeating-linear-gradient(112deg, rgba(30,92,122,.18) 0 1px, transparent 1px 72px);
  background-attachment:fixed;
  color:var(--c-paper);
  font-family:var(--f-body);
  font-size:var(--t-17);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  min-height:100dvh;
}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:800;line-height:1.12;letter-spacing:-.01em;margin:0 0 .5em}
p{margin:0 0 1em}
a{color:var(--c-cyan);text-decoration:none;transition:color var(--ease)}
a:hover{color:var(--c-cyan-soft)}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--c-cyan-soft);outline-offset:3px}
::selection{background:var(--c-cyan);color:var(--c-ink)}
#main-content{display:block}

/* ---------- 2. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:calc(var(--rail) + 12px);
  top:12px;
  z-index:200;
  transform:translateY(-220%);
  background:var(--c-cyan);
  color:var(--c-ink);
  font-family:var(--f-display);
  font-weight:800;
  font-size:14px;
  letter-spacing:.08em;
  padding:10px 18px;
  clip-path:var(--cut-tr);
  transition:transform var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--c-ink);text-decoration:none}

/* ---------- 3. 页头 · 左侧轨道 ---------- */
.site-header{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail);
  z-index:80;
  background:linear-gradient(180deg,#0C2138 0%,#061426 46%,#061426 100%);
  border-right:1px solid rgba(30,92,122,.85);
  display:flex;
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  background:repeating-linear-gradient(148deg, rgba(30,92,122,.28) 0 1px, transparent 1px 20px);
  opacity:.55;
  pointer-events:none;
}
.site-header[data-open]{border-right-color:rgba(22,200,216,.6)}
.site-header__inner{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  width:100%;
  height:100%;
  padding:18px 0 20px;
}

/* 品牌 */
.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:12px;
  color:var(--c-paper);
  text-decoration:none;
}
.brand:hover{color:var(--c-paper);text-decoration:none}
.brand__glyph{
  width:44px;height:44px;
  display:grid;place-items:center;
  font-family:var(--f-display);font-weight:800;font-size:22px;
  color:var(--c-ink);
  background:linear-gradient(140deg,var(--c-cyan),var(--c-cyan-soft));
  clip-path:polygon(0 0,100% 0,100% 66%,66% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;align-items:center;gap:8px}
.brand__name{
  writing-mode:vertical-rl;
  font-family:var(--f-display);
  font-weight:800;
  font-size:15px;
  letter-spacing:.22em;
  line-height:1;
  color:var(--c-paper);
}
.brand__sub{display:none}

/* 移动导航按钮（桌面隐藏） */
.nav-toggle{display:none}

/* 导航：桌面为竖向轨道 */
.site-nav{
  flex:1 1 auto;
  width:100%;
  min-height:0;
  overflow-y:auto;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:8px 0;
}
.site-nav__list{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
}
.site-nav__item{display:flex;justify-content:center;width:100%}
.site-nav__link{
  position:relative;
  width:64px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  padding:11px 4px;
  color:var(--c-muted);
  border:1px solid transparent;
  text-decoration:none;
  transition:color var(--ease),border-color var(--ease),background var(--ease);
}
.site-nav__link:hover{
  color:var(--c-paper);
  background:rgba(22,200,216,.09);
  border-color:rgba(30,92,122,.95);
  text-decoration:none;
}
.site-nav__link[aria-current="page"]{
  color:var(--c-cyan);
  border-color:rgba(22,200,216,.55);
  background:linear-gradient(180deg,rgba(22,200,216,.18),rgba(22,200,216,.02));
}
.site-nav__link[aria-current="page"]::before{
  content:"";
  position:absolute;
  left:-2px;top:50%;
  transform:translateY(-50%);
  width:3px;height:26px;
  background:var(--c-orange);
}
.site-nav__index{
  font-family:var(--f-mono);
  font-size:10px;
  letter-spacing:.06em;
  opacity:.8;
}
.site-nav__label{
  writing-mode:vertical-rl;
  font-family:var(--f-display);
  font-weight:700;
  font-size:14px;
  letter-spacing:.16em;
  line-height:1;
}
.site-nav__meta{display:none}

/* 轨道底部主行动 */
.rail-cta{
  margin-top:auto;
  display:grid;
  place-items:center;
  padding:16px 8px;
  writing-mode:vertical-rl;
  font-family:var(--f-display);
  font-weight:800;
  font-size:13px;
  letter-spacing:.2em;
  color:var(--c-ink);
  background:linear-gradient(180deg,var(--c-orange),#d9520f);
  clip-path:polygon(0 0,100% 0,100% 84%,84% 100%,0 100%);
  transition:filter var(--ease),transform var(--ease);
}
.rail-cta:hover{color:var(--c-ink);filter:brightness(1.1);transform:translateX(-2px);text-decoration:none}

/* 滚动进度线 */
.header-progress{
  position:absolute;
  top:0;bottom:0;right:0;
  width:3px;
  background:rgba(30,92,122,.45);
  pointer-events:none;
}
.header-progress__bar{
  display:block;
  width:100%;height:100%;
  transform-origin:top center;
  transform:scaleY(var(--progress,0));
  background:linear-gradient(180deg,var(--c-cyan),var(--c-orange));
}

/* ---------- 4. 页面骨架与容器 ---------- */
@media (min-width:901px){
  body{padding-left:var(--rail)}
}
.shell{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--pad-x);
}
.shell--read{max-width:min(62ch,760px);margin-left:auto;margin-right:auto}
.section{padding:72px 0;position:relative}
.section--tight{padding:44px 0}
.section--band{
  background:linear-gradient(100deg, rgba(20,58,92,.92) 0%, rgba(12,33,56,.55) 58%, rgba(6,20,38,0) 100%);
  border-top:1px solid rgba(30,92,122,.6);
  border-bottom:1px solid rgba(30,92,122,.6);
}
.rule{
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,rgba(22,200,216,.75),rgba(30,92,122,.35) 46%,rgba(255,106,31,.55));
  transform:skewY(-.6deg);
}
.prose{max-width:62ch;font-size:var(--t-17)}
.prose p{margin:0 0 1.1em}
.prose ul{list-style:disc;padding-left:1.3em;margin:0 0 1.1em}
.prose li{margin:0 0 .4em}

/* 章节编号标题 */
.sec-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px 18px;
  margin:0 0 28px;
  padding-bottom:14px;
  border-bottom:1px solid rgba(30,92,122,.6);
}
.sec-head__num{
  font-family:var(--f-mono);
  font-size:14px;
  letter-spacing:.12em;
  color:var(--c-orange);
}
.sec-head__title{font-size:var(--t-30);margin:0;letter-spacing:-.015em}
.sec-head__note{
  font-family:var(--f-editorial);
  font-size:16px;
  color:var(--c-muted);
  margin:0 0 0 auto;
}

/* ---------- 5. 网格 ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gutter);
}
.grid--tight{gap:16px}
.grid--wide{gap:var(--gutter) 40px}
.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-10{grid-column:span 10}
.col-12{grid-column:span 12}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  font-family:var(--f-display);
  font-weight:800;
  font-size:14px;
  letter-spacing:.09em;
  color:var(--c-paper);
  background:rgba(12,33,56,.85);
  border:1px solid var(--c-steel);
  clip-path:var(--cut-tr);
  text-decoration:none;
  transition:background var(--ease),border-color var(--ease),transform var(--ease),color var(--ease);
}
.btn:hover{color:var(--c-paper);border-color:var(--c-cyan);transform:translateY(-2px);text-decoration:none}
.btn--primary{
  color:var(--c-ink);
  border-color:transparent;
  background:linear-gradient(122deg,var(--c-orange),var(--c-orange-soft));
}
.btn--primary:hover{color:var(--c-ink);filter:brightness(1.06)}
.btn--cyan{
  color:var(--c-cyan);
  background:rgba(22,200,216,.08);
  border-color:rgba(22,200,216,.6);
}
.btn--cyan:hover{color:var(--c-ink);background:var(--c-cyan)}
.btn--ghost{color:var(--c-muted);background:transparent}

/* ---------- 7. 卡片 / 标签 / 数据 ---------- */
.panel{
  position:relative;
  padding:22px;
  background:linear-gradient(158deg, rgba(20,58,92,.62), rgba(12,33,56,.94));
  border:1px solid rgba(30,92,122,.75);
  clip-path:var(--cut-both);
  transition:transform var(--ease),border-color var(--ease),background var(--ease);
}
.panel:hover{transform:translateY(-2px);border-color:rgba(22,200,216,.7)}
.panel__head{
  display:flex;align-items:baseline;justify-content:space-between;gap:12px;
  margin:0 0 12px;
  padding-bottom:10px;
  border-bottom:1px solid rgba(30,92,122,.55);
}
.panel__title{font-size:var(--t-22);margin:0}
.panel__meta{font-family:var(--f-mono);font-size:12px;color:var(--c-muted)}
.panel__body{margin:0;color:var(--c-paper)}
.panel--flat{background:rgba(12,33,56,.7)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 11px;
  font-family:var(--f-display);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--c-muted);
  background:rgba(6,20,38,.7);
  border:1px solid rgba(30,92,122,.9);
  clip-path:polygon(0 0,calc(100% - 9px) 0,100% 9px,100% 100%,0 100%);
  text-decoration:none;
  transition:color var(--ease),background var(--ease),border-color var(--ease);
}
.tag:hover,.tag[aria-pressed="true"]{
  color:var(--c-ink);
  background:var(--c-cyan);
  border-color:var(--c-cyan);
}
.tag--warm:hover,.tag--warm[aria-pressed="true"]{
  background:var(--c-orange);
  border-color:var(--c-orange);
}
.tag--muted{color:var(--c-muted)}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__num{
  font-family:var(--f-mono);
  font-weight:700;
  font-size:var(--t-44);
  line-height:1;
  letter-spacing:.01em;
  color:var(--c-orange);
}
.stat__num--cyan{color:var(--c-cyan)}
.stat__unit{font-size:.42em;margin-left:.15em;color:var(--c-muted);letter-spacing:.05em}
.stat__label{
  font-family:var(--f-display);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--c-muted);
}

.data-row{
  display:flex;
  align-items:baseline;
  gap:14px;
  padding:12px 0;
  border-bottom:1px dashed rgba(30,92,122,.6);
}
.data-row:hover{background:rgba(22,200,216,.05)}
.data-row__key{
  flex:0 0 auto;
  font-family:var(--f-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--c-cyan);
}
.data-row__main{flex:1 1 auto;color:var(--c-paper)}
.data-row__note{font-size:14px;color:var(--c-muted)}

/* ---------- 8. 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 9;
  background:linear-gradient(140deg,#143A5C,#061426 70%);
  border:1px solid rgba(30,92,122,.8);
  clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,0 100%);
}
.media::after{
  content:"";
  position:absolute;
  inset:auto 0 0 0;
  height:3px;
  background:linear-gradient(90deg,var(--c-cyan),rgba(255,106,31,.9));
  opacity:.75;
  pointer-events:none;
}
.media img,
.media > picture > img{
  width:100%;height:100%;
  object-fit:cover;
  filter:saturate(.92) contrast(1.06);
  transition:transform 320ms cubic-bezier(.4,0,.2,1);
}
.media:hover img{transform:scale(1.02)}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--square{aspect-ratio:1 / 1}
.media--tilt{transform:rotate(-2.2deg)}
.media__caption{
  position:absolute;
  inset:auto 0 0 0;
  padding:26px 14px 12px;
  font-size:13px;
  letter-spacing:.04em;
  color:var(--c-paper);
  background:linear-gradient(transparent, rgba(6,20,38,.9));
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb{
  padding:22px 0 0;
  font-family:var(--f-display);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--c-muted);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item a{color:var(--c-muted)}
.breadcrumb__item a:hover{color:var(--c-cyan)}
.breadcrumb__item [aria-current="page"]{color:var(--c-paper)}
.breadcrumb__sep{color:var(--c-steel)}

/* ---------- 10. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:64px;
  background:linear-gradient(180deg,rgba(12,33,56,.92),#061426 62%);
  border-top:1px solid rgba(30,92,122,.85);
}
.site-footer__band{
  height:6px;
  background:linear-gradient(90deg,var(--c-cyan) 0%,var(--c-orange) 58%,var(--c-steel) 100%);
  transform:skewY(-.7deg);
}
.site-footer__inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:56px var(--pad-x) 28px;
}
.site-footer__grid{
  display:grid;
  grid-template-columns:1.6fr .9fr .9fr .9fr 1.5fr;
  gap:32px;
}
.foot-lead__brand{
  font-family:var(--f-display);
  font-weight:800;
  font-size:26px;
  letter-spacing:-.01em;
  margin:0 0 10px;
}
.foot-lead__text{
  max-width:34ch;
  font-size:15px;
  line-height:1.75;
  color:var(--c-muted);
  margin:0 0 20px;
}
.foot-col{min-width:0}
.foot-col__title{
  display:flex;
  align-items:center;
  gap:8px;
  font-family:var(--f-display);
  font-size:13px;
  font-weight:800;
  letter-spacing:.16em;
  color:var(--c-cyan-soft);
  margin:0 0 16px;
}
.foot-col__title::before{
  content:"";
  width:12px;height:2px;
  background:var(--c-orange);
  flex:0 0 auto;
}
.foot-links{display:grid;gap:10px}
.foot-links a{
  position:relative;
  display:inline-block;
  padding-left:0;
  font-size:15px;
  color:var(--c-muted);
  transition:color var(--ease),padding-left var(--ease);
}
.foot-links a::before{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:0;height:1px;
  background:var(--c-cyan);
  transition:width var(--ease);
}
.foot-links a:hover{color:var(--c-paper);padding-left:14px;text-decoration:none}
.foot-links a:hover::before{width:10px}

.contact-list{display:grid;gap:14px}
.contact-list__item{display:grid;gap:2px}
.contact-list__key{
  font-family:var(--f-display);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--c-steel);
  filter:brightness(1.6);
}
.contact-list__val{
  font-family:var(--f-mono);
  font-size:13px;
  line-height:1.6;
  color:var(--c-paper);
  word-break:break-word;
}
.foot-col__note{
  margin:16px 0 0;
  padding-top:12px;
  border-top:1px dashed rgba(30,92,122,.7);
  font-size:13px;
  line-height:1.7;
  color:var(--c-muted);
}

.site-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-top:48px;
  padding-top:20px;
  border-top:1px dashed rgba(30,92,122,.7);
}
.foot-legal{
  display:flex;
  flex-wrap:wrap;
  gap:8px 22px;
  font-family:var(--f-display);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--c-muted);
}
.foot-legal__copy{color:var(--c-muted)}
.to-top{
  padding:10px 18px;
  font-family:var(--f-display);
  font-weight:800;
  font-size:13px;
  letter-spacing:.12em;
  color:var(--c-cyan);
  background:rgba(22,200,216,.08);
  border:1px solid rgba(22,200,216,.55);
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,0 100%);
  transition:color var(--ease),background var(--ease),transform var(--ease);
}
.to-top:hover{color:var(--c-ink);background:var(--c-cyan);transform:translateY(-2px)}

/* ---------- 11. 工具类 ---------- */
.u-mono{font-family:var(--f-mono)}
.u-serif{font-family:var(--f-editorial)}
.u-muted{color:var(--c-muted)}
.u-cyan{color:var(--c-cyan)}
.u-orange{color:var(--c-orange)}
.u-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;
}

/* ---------- 12. 显现动效 ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity 520ms ease,transform 520ms ease;
  transition-delay:var(--reveal-delay,0ms);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 13. 平板 ---------- */
@media (max-width:1080px){
  :root{--pad-x:24px;--gutter:20px}
  .grid{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-2,.col-3,.col-4{grid-column:span 3}
  .col-5,.col-6,.col-7{grid-column:span 6}
  .col-8,.col-9,.col-10,.col-12{grid-column:span 6}
  .site-footer__grid{grid-template-columns:1.4fr 1fr 1fr;gap:28px}
  .foot-lead{grid-column:span 3}
}
@media (max-width:720px){
  .site-footer__grid{grid-template-columns:1fr 1fr}
  .foot-lead{grid-column:span 2}
  .foot-col--contact{grid-column:span 2}
}

/* ---------- 14. 移动端：轨道收为顶栏 + 抽屉 ---------- */
@media (max-width:900px){
  :root{--pad-x:18px;--gutter:16px}
  body{font-size:16px;padding-left:0}
  .skip-link{left:12px}

  .site-header{
    position:sticky;
    top:0;left:auto;right:auto;bottom:auto;
    width:auto;height:auto;
    border-right:0;
    border-bottom:1px solid rgba(30,92,122,.85);
  }
  .site-header::before{opacity:.35}
  .site-header__inner{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    height:var(--rail-top);
    padding:0 14px;
  }
  .brand{flex-direction:row;gap:10px}
  .brand__glyph{width:36px;height:36px;font-size:18px}
  .brand__text{flex-direction:column;align-items:flex-start;gap:0}
  .brand__name{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.05em;
    line-height:1.25;
  }
  .brand__sub{
    display:block;
    font-family:var(--f-display);
    font-size:10px;
    letter-spacing:.16em;
    line-height:1.3;
    color:var(--c-muted);
  }

  .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:9px;
    padding:9px 13px;
    font-family:var(--f-display);
    font-weight:800;
    font-size:12px;
    letter-spacing:.14em;
    color:var(--c-paper);
    background:rgba(12,33,56,.92);
    border:1px solid rgba(30,92,122,.95);
    clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,0 100%);
    transition:border-color var(--ease),color var(--ease);
  }
  .nav-toggle:hover{border-color:var(--c-cyan)}
  .nav-toggle[aria-expanded="true"]{color:var(--c-cyan);border-color:rgba(22,200,216,.7)}
  .nav-toggle__bars{display:grid;gap:4px;width:16px}
  .nav-toggle__bar{
    display:block;
    width:16px;height:2px;
    background:var(--c-cyan);
    transition:transform var(--ease);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child{transform:translateY(3px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child{transform:translateY(-3px) rotate(-45deg)}
  .nav-toggle__label{white-space:nowrap}

  .site-nav{
    position:fixed;
    top:var(--rail-top);
    left:0;right:0;
    width:auto;
    max-height:calc(100dvh - var(--rail-top));
    padding:16px 16px 26px;
    overflow-y:auto;
    display:block;
    background:linear-gradient(180deg,#0C2138,#061426 72%);
    border-bottom:1px solid rgba(22,200,216,.4);
    box-shadow:0 24px 48px rgba(0,0,0,.45);
    visibility:hidden;
    opacity:0;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity 220ms ease,transform 220ms ease,visibility 220ms;
    z-index:70;
  }
  .site-nav[data-open]{
    visibility:visible;
    opacity:1;
    transform:none;
    pointer-events:auto;
  }
  .site-nav__list{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:8px;
  }
  .site-nav__item{width:auto;display:block}
  .site-nav__link{
    width:auto;
    flex-direction:row;
    align-items:center;
    justify-content:flex-start;
    gap:10px;
    padding:13px 14px;
    color:var(--c-paper);
    background:rgba(6,20,38,.62);
    border:1px solid rgba(30,92,122,.85);
    clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,0 100%);
  }
  .site-nav__link[aria-current="page"]{color:var(--c-cyan)}
  .site-nav__link[aria-current="page"]::before{
    left:0;bottom:0;top:auto;
    width:100%;height:3px;
    transform:none;
  }
  .site-nav__index{font-size:11px}
  .site-nav__label{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.05em;
  }
  .site-nav__meta{
    display:grid;
    gap:12px;
    margin-top:16px;
    padding-top:16px;
    border-top:1px dashed rgba(30,92,122,.8);
  }
  .site-nav__tagline{
    margin:0;
    font-family:var(--f-editorial);
    font-size:13px;
    line-height:1.7;
    color:var(--c-muted);
  }
  .site-nav__cta{
    display:inline-flex;
    justify-content:center;
    padding:12px 18px;
    font-family:var(--f-display);
    font-weight:800;
    font-size:13px;
    letter-spacing:.12em;
    color:var(--c-cyan);
    background:rgba(22,200,216,.1);
    border:1px solid rgba(22,200,216,.6);
    clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,0 100%);
  }
  .site-nav__cta:hover{color:var(--c-ink);background:var(--c-cyan);text-decoration:none}

  .rail-cta{display:none}

  .header-progress{
    top:auto;bottom:0;left:0;right:0;
    width:auto;height:3px;
  }
  .header-progress__bar{
    transform-origin:left center;
    transform:scaleX(var(--progress,0));
    background:linear-gradient(90deg,var(--c-cyan),var(--c-orange));
  }

  .section{padding:52px 0}
  .sec-head__note{margin:0;flex-basis:100%}
  .site-footer__inner{padding:44px var(--pad-x) 24px}
  .foot-lead__brand{font-size:22px}
  .site-footer__bottom{margin-top:36px}
}

@media (max-width:480px){
  .site-nav__list{grid-template-columns:1fr}
  .site-footer__grid{grid-template-columns:1fr}
  .foot-lead{grid-column:span 1}
  .foot-col--contact{grid-column:span 1}
  .site-footer__bottom{flex-direction:column;align-items:flex-start}
}

/* ---------- 15. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
}