:root{
  --c-void:#0A1A16;
  --c-carbon:#101418;
  --c-pine:#16302A;
  --c-cyan:#00E5C3;
  --c-mist:#7FF3E0;
  --c-diff:#FF6B35;
  --c-paper:#F4F1E8;
  --c-body:#A9BDB6;
  --c-white:#FFFFFF;
  --c-line:#2C4A42;

  --font-display:"Barlow Condensed","PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-serif:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,"SF Mono",Consolas,monospace;

  --fs-12:0.75rem;
  --fs-14:0.875rem;
  --fs-16:1rem;
  --fs-20:1.25rem;
  --fs-26:1.625rem;
  --fs-34:2.125rem;
  --fs-48:3rem;
  --fs-72:4.5rem;

  --maxw:1240px;
  --gutter:clamp(1rem,3vw,2.5rem);
  --header-h:104px;
}
@media (max-width:900px){
  :root{--header-h:96px}
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  background-color:var(--c-void);
  background-image:repeating-linear-gradient(90deg,rgba(44,74,66,.16) 0 1px,transparent 1px 96px);
  background-attachment:fixed;
  color:var(--c-body);
  font-family:var(--font-body);
  font-size:var(--fs-16);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.14;
  letter-spacing:-0.01em;
  color:var(--c-white);
}
h1{font-size:clamp(2.25rem,5.4vw,4.5rem)}
h2{font-size:clamp(1.5rem,3.2vw,2.125rem)}
h3{font-size:var(--fs-20)}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:var(--c-cyan);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--c-mist)}
img,picture,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
hr{border:0;margin:0}
:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px}
::selection{background:var(--c-cyan);color:var(--c-carbon)}

.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;
}
.skip-link{
  position:absolute;left:1rem;top:-5rem;z-index:200;
  display:inline-block;padding:.65rem 1rem;
  background:var(--c-cyan);color:var(--c-carbon);
  font-weight:700;font-size:var(--fs-14);letter-spacing:.02em;
  transition:top .2s ease;
}
.skip-link:focus{top:.75rem;color:var(--c-carbon)}

.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.site-main{display:block;padding-bottom:clamp(2.5rem,6vw,5rem)}
#main-content{scroll-margin-top:calc(var(--header-h) + 1rem)}

.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-family:var(--font-serif);font-size:var(--fs-12);
  letter-spacing:.18em;color:var(--c-mist);text-transform:uppercase;
}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--c-cyan)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.rule{height:1px;background:var(--c-line);width:100%}
.rule-cyan{height:2px;background:var(--c-cyan);width:100%}

.section{padding-block:clamp(2.25rem,5vw,4rem)}
.section-head{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.85fr);
  gap:1rem 2rem;align-items:end;
  padding-bottom:1.1rem;margin-bottom:clamp(1.25rem,3vw,2rem);
  border-bottom:1px solid var(--c-line);
}
.section-head p{font-size:var(--fs-14);line-height:1.65;color:var(--c-body)}
@media (max-width:700px){.section-head{grid-template-columns:1fr}}

.grid{display:grid;gap:clamp(1rem,2.5vw,2rem)}
.grid-12{grid-template-columns:repeat(12,1fr)}
.col-main{grid-column:span 7}
.col-side{grid-column:span 3}
.col-gap{grid-column:span 2}
@media (max-width:900px){
  .col-main,.col-side,.col-gap{grid-column:1/-1}
}

.board{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:clamp(.75rem,1.6vw,1.25rem);
}
.board-cell{grid-column:span 1}
.board-cell--wide{grid-column:span 2}
.board-cell--tall{grid-row:span 2}
@media (max-width:900px){.board{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){
  .board{grid-template-columns:1fr}
  .board-cell,.board-cell--wide{grid-column:1/-1}
  .board-cell--tall{grid-row:auto}
}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.7rem 1.15rem;
  border:1px solid var(--c-cyan);
  color:var(--c-cyan);background:transparent;
  font-size:var(--fs-14);font-weight:700;letter-spacing:.02em;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{background:var(--c-cyan);color:var(--c-carbon)}
.btn-primary{background:var(--c-cyan);color:var(--c-carbon)}
.btn-primary:hover{background:var(--c-mist);border-color:var(--c-mist);color:var(--c-carbon)}
.btn-ghost{border-color:var(--c-line);color:var(--c-white)}
.btn-ghost:hover{border-color:var(--c-cyan);color:var(--c-cyan);background:rgba(0,229,195,.08)}
.btn-diff{border-color:var(--c-diff);color:var(--c-diff);background:rgba(255,107,53,.08)}
.btn-diff:hover{background:var(--c-diff);color:#1b0c05;border-color:var(--c-diff)}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.2rem .5rem;
  border:1px solid var(--c-line);background:rgba(22,48,42,.65);
  font-family:var(--font-mono);font-size:var(--fs-12);
  letter-spacing:.04em;color:var(--c-mist);
}
.tag-accent{border-color:var(--c-cyan);color:var(--c-cyan);background:rgba(0,229,195,.08)}
.tag-diff{border-color:var(--c-diff);color:var(--c-diff);background:rgba(255,107,53,.1)}

.panel{
  position:relative;
  background:var(--c-pine);
  border:1px solid var(--c-line);
  padding:clamp(1.1rem,2.5vw,1.9rem);
}
.panel-paper{background:var(--c-paper);border-color:var(--c-line);color:#22302b}
.panel-paper h2,.panel-paper h3,.panel-paper h4{color:var(--c-void)}
.panel-paper a{color:#0a6f5f}
.panel-paper a:hover{color:#08302a}
.panel-stack{
  box-shadow:6px 6px 0 0 var(--c-carbon),12px 12px 0 0 rgba(44,74,66,.55);
}
.card-lift{transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease}
.card-lift:hover{
  transform:translateY(-4px);
  border-color:var(--c-cyan);
  box-shadow:6px 10px 0 0 var(--c-carbon),12px 16px 0 0 rgba(44,74,66,.55);
}

.stat-band{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));
  border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);
  background:var(--c-carbon);
}
.stat{padding:1.1rem 1.25rem;border-left:1px solid var(--c-line)}
.stat:first-child{border-left:0}
.stat-value{
  display:block;font-family:var(--font-mono);font-weight:700;
  font-size:clamp(1.6rem,3.4vw,2.125rem);line-height:1.1;
  letter-spacing:-.02em;color:var(--c-cyan);
  border-bottom:1px solid var(--c-line);padding-bottom:.4rem;
}
.stat-label{display:block;margin-top:.45rem;font-size:var(--fs-12);letter-spacing:.08em;color:var(--c-body)}

.breadcrumb{padding-block:.9rem;border-bottom:1px solid var(--c-line)}
.crumb-list{
  display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;
  font-family:var(--font-mono);font-size:var(--fs-12);
}
.crumb-link{color:var(--c-body)}
.crumb-link:hover{color:var(--c-cyan)}
.crumb-sep{color:var(--c-line)}
.crumb-current{color:var(--c-cyan)}

.prose{max-width:68ch;font-size:var(--fs-16);line-height:1.75;color:var(--c-body)}
.prose h2{font-size:clamp(1.4rem,3vw,1.75rem);margin:2rem 0 .75rem}
.prose h3{font-size:var(--fs-20);margin:1.5rem 0 .5rem}
.prose p{margin-bottom:1rem}
.prose ul{margin-bottom:1rem}
.prose li{position:relative;padding-left:1.1rem;margin-bottom:.4rem}
.prose li::before{
  content:"";position:absolute;left:0;top:.78em;
  width:7px;height:1px;background:var(--c-cyan);
}
.prose-paper{max-width:68ch;color:#22302b}
.prose-paper li::before{background:#0a6f5f}

.toc{
  position:sticky;top:calc(var(--header-h) + 1rem);
  border:1px solid var(--c-line);
  background:rgba(16,20,24,.9);
  padding:1rem;
}
.toc-title{
  font-family:var(--font-serif);font-size:var(--fs-12);
  letter-spacing:.16em;color:var(--c-white);
  margin-bottom:.7rem;text-transform:uppercase;
}
.toc-list{display:flex;flex-direction:column;gap:.1rem}
.toc-link{
  display:block;padding:.4rem .5rem;
  border-left:2px solid transparent;
  font-size:var(--fs-14);color:var(--c-body);
  transition:color .18s ease,background .18s ease,border-color .18s ease;
}
.toc-link:hover{color:var(--c-white);background:rgba(0,229,195,.06)}
.toc-link.is-active{
  color:var(--c-cyan);border-left-color:var(--c-cyan);
  background:rgba(0,229,195,.08);
}
.toc-item--sub .toc-link{padding-left:1.2rem;font-size:var(--fs-12)}
@media (max-width:900px){.toc{position:static}}

.media-frame{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--c-line);background:var(--c-pine);
  aspect-ratio:16/9;
}
.media-frame img,.media-frame picture,.media-frame .media-placeholder{
  width:100%;height:100%;object-fit:cover;
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  box-shadow:inset 0 0 0 1px rgba(244,241,232,.08);
}
.media-frame--slice{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-placeholder{
  display:grid;place-items:center;
  background-image:repeating-linear-gradient(135deg,rgba(0,229,195,.07) 0 1px,transparent 1px 12px);
  color:var(--c-line);font-family:var(--font-mono);font-size:var(--fs-12);letter-spacing:.1em;
}
.media-label{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:.28rem .6rem;
  background:var(--c-carbon);
  border-top:1px solid var(--c-line);border-right:1px solid var(--c-line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--c-mist);
}

/* ---------- 页头 ---------- */
.site-header{position:sticky;top:0;z-index:80;background:var(--c-carbon)}
.header-utility{
  height:40px;background:var(--c-carbon);
  border-bottom:1px solid var(--c-line);
  display:flex;align-items:center;
}
.utility-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:1rem;height:100%;min-width:0;
}
.utility-brand{
  display:flex;align-items:center;gap:.5rem;min-width:0;
  font-size:var(--fs-12);letter-spacing:.06em;color:var(--c-body);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.utility-pip{
  flex:none;width:6px;height:6px;background:var(--c-cyan);
  box-shadow:0 0 8px rgba(0,229,195,.85);
}
.utility-meta{
  display:flex;align-items:center;gap:.55rem;flex:none;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.02em;color:var(--c-body);
}
.utility-mail{color:var(--c-mist)}
.utility-sep{color:var(--c-line)}
.utility-hours{color:var(--c-body)}

.header-main{position:relative;background:var(--c-carbon);border-bottom:1px solid var(--c-line)}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:1.5rem;min-height:64px;padding-block:.55rem;
}
.brand{display:inline-flex;align-items:center;gap:.65rem;flex:none;color:var(--c-white)}
.brand:hover{color:var(--c-white)}
.brand-mark{
  display:grid;place-items:center;flex:none;
  width:36px;height:36px;
  background:var(--c-pine);border:1px solid var(--c-cyan);
  color:var(--c-cyan);font-family:var(--font-display);
  font-weight:800;font-size:var(--fs-20);line-height:1;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{
  font-family:var(--font-display);font-weight:800;
  font-size:var(--fs-20);letter-spacing:.02em;color:inherit;
}
.brand-sub{
  font-family:var(--font-mono);font-size:10px;
  letter-spacing:.16em;color:var(--c-body);text-transform:uppercase;
}

.primary-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(.5rem,1.4vw,1.35rem)}
.nav-link{
  position:relative;display:inline-block;padding:.35rem 0;
  font-size:15px;font-weight:600;color:var(--c-body);white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-3px;height:2px;
  background:var(--c-cyan);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .22s ease;
}
.nav-link:hover{color:var(--c-white)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--c-cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.nav-item-cta{margin-left:.35rem}
.nav-cta{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.5rem .85rem;white-space:nowrap;
  border:1px solid var(--c-cyan);
  background:rgba(0,229,195,.06);
  color:var(--c-cyan);font-size:var(--fs-14);font-weight:700;letter-spacing:.02em;
  transition:background .18s ease,color .18s ease;
}
.nav-cta::before{content:"";width:6px;height:6px;background:currentColor;transform:rotate(45deg)}
.nav-cta:hover{background:var(--c-cyan);color:var(--c-carbon)}

.nav-toggle{
  display:none;align-items:center;gap:.55rem;
  padding:.45rem .55rem;
  border:1px solid var(--c-line);color:var(--c-body);
  font-size:var(--fs-12);letter-spacing:.08em;
  transition:color .18s ease,border-color .18s ease;
}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars span{display:block;height:2px;background:currentColor;transition:transform .2s ease}
.nav-toggle-label{white-space:nowrap}
.nav-toggle:hover{color:var(--c-white);border-color:var(--c-mist)}
.nav-toggle[aria-expanded="true"]{color:var(--c-cyan);border-color:var(--c-cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){transform:translateY(-3px) rotate(-45deg)}

.index-panel{
  position:absolute;top:100%;left:0;right:0;z-index:5;
  background:var(--c-pine);
  border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);
  box-shadow:0 20px 34px rgba(0,0,0,.45);
}
.index-panel[hidden]{display:none}
.index-panel-inner{
  display:grid;grid-template-columns:1fr 1fr;
  gap:clamp(1rem,3vw,2.5rem);
  padding-block:1.5rem;
}
.index-step{min-width:0}
.index-step-label{
  display:flex;align-items:center;gap:.5rem;
  font-family:var(--font-serif);font-size:var(--fs-14);
  letter-spacing:.06em;color:var(--c-white);margin-bottom:.8rem;
}
.index-step-label .mono{color:var(--c-cyan);font-size:var(--fs-12)}
.index-cluster{display:flex;flex-wrap:wrap;gap:.5rem .9rem}
.index-link{
  display:inline-block;padding:.2rem .05rem;
  font-size:15px;font-weight:600;color:var(--c-white);
  border-bottom:1px solid transparent;
}
.index-link:hover{color:var(--c-cyan);border-bottom-color:var(--c-cyan)}
.index-tags{display:flex;flex-wrap:wrap;gap:.4rem}
.index-tag{
  display:inline-block;padding:.2rem .55rem;
  border:1px solid var(--c-line);background:rgba(10,26,22,.6);
  font-family:var(--font-mono);font-size:var(--fs-12);color:var(--c-mist);
}
.index-note{margin-top:.8rem;font-size:var(--fs-12);line-height:1.6;color:var(--c-body)}

.nav-backdrop{
  display:none;position:fixed;inset:0;z-index:65;
  background:rgba(10,26,22,.74);
}
.nav-backdrop[data-open]{display:block}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--c-carbon);
  border-top:1px solid var(--c-line);
  color:var(--c-body);
}
.footer-inner{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);
  gap:clamp(1.5rem,4vw,3.5rem);
  padding-block:clamp(2rem,5vw,3.25rem);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:.9rem}
.footer-tagline{max-width:34ch;font-size:var(--fs-14);line-height:1.7;color:var(--c-body)}
.footer-icp{
  font-family:var(--font-mono);font-size:var(--fs-12);
  letter-spacing:.04em;color:var(--c-line);
  border-top:1px solid var(--c-line);padding-top:.75rem;width:100%;
}
.footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem}
.footer-col-title{
  font-family:var(--font-serif);font-weight:600;
  font-size:var(--fs-12);letter-spacing:.16em;
  color:var(--c-white);margin-bottom:.75rem;
}
.footer-links{display:flex;flex-direction:column;gap:.45rem}
.footer-link{font-size:var(--fs-14);color:var(--c-body)}
.footer-link:hover{color:var(--c-cyan)}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.75rem 1.75rem;
  padding-block:1.15rem;
  border-top:1px solid var(--c-line);
}
.footer-contact-line{
  font-family:var(--font-mono);font-size:11px;
  letter-spacing:.02em;color:var(--c-body);word-break:break-word;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:.5rem 1rem}
.legal-link{font-size:var(--fs-12);color:var(--c-body)}
.legal-link:hover{color:var(--c-cyan)}
.footer-copy{font-family:var(--font-mono);font-size:11px;color:var(--c-line)}

/* ---------- 滚动辅助 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:120;
  pointer-events:none;background:transparent;
}
.scroll-progress-bar{
  height:100%;width:100%;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-mist));
  transform:scaleX(0);transform-origin:left center;
}
.to-top{
  position:fixed;right:clamp(.75rem,2vw,1.5rem);bottom:clamp(.75rem,2vw,1.5rem);
  z-index:90;display:inline-flex;align-items:center;gap:.45rem;
  padding:.6rem .8rem;
  background:var(--c-carbon);border:1px solid var(--c-line);
  color:var(--c-body);font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s ease,color .18s ease,border-color .18s ease;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--c-cyan);color:var(--c-cyan)}

.js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
.js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .utility-hours{display:none}
  .utility-sep{display:none}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:fixed;top:0;right:0;bottom:0;
    width:min(88vw,360px);
    margin-left:0;padding:5rem 1.5rem 2rem;
    background:var(--c-carbon);border-left:1px solid var(--c-line);
    overflow-y:auto;z-index:70;
    transform:translateX(100%);
    visibility:hidden;
    transition:transform .28s ease,visibility .28s ease;
  }
  .primary-nav[data-open]{transform:translateX(0);visibility:visible}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{display:block;padding:.85rem 0;font-size:var(--fs-16);border-bottom:1px solid var(--c-line)}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--c-cyan)}
  .nav-item-cta{margin:1.25rem 0 0}
  .nav-cta{width:100%;justify-content:center;padding:.8rem}
  .index-panel{
    position:fixed;top:auto;left:0;right:0;bottom:0;
    max-height:72vh;overflow-y:auto;z-index:76;
    border-top:1px solid var(--c-cyan);
    box-shadow:0 -20px 34px rgba(0,0,0,.5);
  }
  .index-panel-inner{grid-template-columns:1fr;padding-block:1.35rem}
  .footer-inner{grid-template-columns:1fr}
}
@media (max-width:700px){
  .utility-meta{display:none}
  .footer-cols{grid-template-columns:repeat(2,1fr)}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:420px){
  .brand-sub{display:none}
  .brand-mark{width:32px;height:32px;font-size:var(--fs-16)}
}

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