:root{
  --deep-sea:#0B2A4A;
  --abyss:#06172A;
  --lane-blue:#16406B;
  --leyu-orange:#FF6B2C;
  --warm-orange:#FFB08A;
  --sub-teal:#2EC4B6;
  --teal-soft:#A8E6DF;
  --wine:#7A1F3D;
  --indigo:#2B2A6B;
  --fog:#F2F5F7;
  --steel:#9FB3C8;
  --mint:#62E6C8;
  --ink:#0E1420;
  --text-on-deep:#DCE6EF;
  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --max-w:1280px;
  --rail-w:96px;
  --gutter:24px;
  --radius-lg:28px;
  --radius-md:18px;
  --radius-pill:999px;
  --focus-ring:0 0 0 2px var(--deep-sea),0 0 0 4px var(--leyu-orange);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--deep-sea);
  color:var(--text-on-deep);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block}
h1,h2,h3,h4{
  margin:0;
  font-weight:800;
  letter-spacing:-.03em;
  line-height:1.06;
  color:#fff;
}
p{margin:0 0 1.15em}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
:focus-visible{outline:none;box-shadow:var(--focus-ring);border-radius:6px}
::selection{background:var(--leyu-orange);color:#fff}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:120;
  transform:translateY(-160%);
  background:var(--leyu-orange);
  color:#fff;
  font-size:14px;
  font-weight:700;
  padding:10px 20px;
  border-radius:var(--radius-pill);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--deep-sea);
  border-bottom:1px solid rgba(159,179,200,.22);
  transition:background .2s var(--ease),box-shadow .2s var(--ease);
}
.site-header[data-stuck]{
  background:rgba(6,23,42,.96);
  box-shadow:0 10px 30px rgba(0,0,0,.35);
}
.header-inner{
  max-width:var(--max-w);
  margin:0 auto;
  padding:16px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.site-header[data-stuck] .header-inner{padding-top:10px;padding-bottom:10px}
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
  min-width:0;
}
.brand-mark{
  font-size:21px;
  font-weight:900;
  letter-spacing:-.035em;
  color:#fff;
  white-space:nowrap;
}
.brand-meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mint);
  border:1px solid rgba(98,230,200,.45);
  border-radius:var(--radius-pill);
  padding:3px 10px;
  white-space:nowrap;
}
.nav-dock{
  display:flex;
  align-items:center;
  gap:28px;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:6px;
}
.nav-link{
  position:relative;
  display:inline-block;
  font-size:14.5px;
  font-weight:500;
  color:var(--text-on-deep);
  padding:8px 12px;
  border-radius:var(--radius-pill);
  transition:color .18s var(--ease),background .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:3px;
  height:2px;
  background:var(--sub-teal);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .18s var(--ease);
}
.nav-link:hover{color:#fff;background:rgba(22,64,107,.85)}
.nav-link:hover::after,
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{
  color:#fff;
  font-weight:700;
}
.nav-link[aria-current="page"]::before{
  content:"";
  position:absolute;
  top:7px;
  left:5px;
  width:4px;
  height:4px;
  border-radius:50%;
  background:var(--leyu-orange);
}
.nav-actions{
  display:flex;
  align-items:center;
  gap:16px;
  padding-left:24px;
  border-left:1px solid rgba(159,179,200,.22);
}
.nav-cta{
  font-size:14px;
  padding:10px 20px;
}
.nav-utility{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--steel);
  transition:color .18s var(--ease);
  white-space:nowrap;
}
.nav-utility:hover{color:var(--warm-orange)}
.nav-toggle{display:none}

/* mobile nav panel */
.nav-panel{display:flex;align-items:center}
.scroll-progress{
  height:2px;
  width:0;
  background:linear-gradient(90deg,var(--sub-teal),var(--leyu-orange));
  transition:width .1s linear;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  padding:13px 26px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  transition:background .18s var(--ease),color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
}
.btn--primary{background:var(--leyu-orange);color:#fff}
.btn--primary:hover{background:var(--warm-orange);color:var(--ink);transform:translateY(-2px);box-shadow:0 8px 22px rgba(255,107,44,.32)}
.btn--ghost{border-color:rgba(159,179,200,.5);color:var(--text-on-deep)}
.btn--ghost:hover{border-color:var(--sub-teal);color:#fff;background:rgba(46,196,182,.14);transform:translateY(-2px)}
.btn--quiet{padding:8px 0;color:var(--sub-teal);font-weight:700}
.btn--quiet:hover{color:var(--mint)}
.btn--quiet::after{content:"→";font-family:var(--font-mono);transition:transform .18s var(--ease)}
.btn--quiet:hover::after{transform:translateX(4px)}

/* ---------- layout ---------- */
.page-main{
  display:block;
  max-width:var(--max-w);
  margin:0 auto;
  padding:0 var(--gutter) 96px;
}
.layout-shell{
  display:grid;
  grid-template-columns:var(--rail-w) minmax(0,1fr);
  gap:var(--gutter);
  max-width:var(--max-w);
  margin:0 auto;
  padding:0 var(--gutter);
}
.rail{
  position:sticky;
  top:96px;
  align-self:start;
  padding-top:48px;
  display:flex;
  flex-direction:column;
  gap:18px;
}
.rail-index{
  display:flex;
  flex-direction:column;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--steel);
}
.rail-index a{
  display:flex;
  align-items:center;
  gap:8px;
  padding:4px 0;
  transition:color .18s var(--ease);
}
.rail-index a::before{
  content:"";
  width:14px;
  height:1px;
  background:currentColor;
  transition:width .18s var(--ease);
}
.rail-index a:hover{color:var(--mint)}
.rail-index a:hover::before{width:22px}

/* ---------- sections ---------- */
.section{
  padding:72px 0;
  border-bottom:1px solid rgba(159,179,200,.14);
}
.section:last-child{border-bottom:0}
.section--deep{background:transparent}
.section--lane{
  background:var(--lane-blue);
  border-radius:var(--radius-lg);
  padding:64px 40px;
  margin:32px 0;
  border-bottom:0;
}
.section--wine{
  background:var(--wine);
  border-radius:var(--radius-lg);
  padding:64px 40px;
  margin:32px 0;
  border-bottom:0;
}
.section--indigo{
  background:var(--indigo);
  border-radius:var(--radius-lg);
  padding:64px 40px;
  margin:32px 0;
  border-bottom:0;
}
.section--fog{
  background:var(--fog);
  color:var(--ink);
  border-radius:var(--radius-lg);
  padding:64px 40px;
  margin:32px 0;
  border-bottom:0;
}
.section--fog h1,
.section--fog h2,
.section--fog h3{color:var(--ink)}
.section--fog .section-lead,
.section--fog .note{color:#4A5A6B}
.section-head{
  display:flex;
  flex-direction:column;
  gap:16px;
  margin-bottom:36px;
}
.section-no{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--mint);
  display:inline-flex;
  align-items:center;
  gap:12px;
}
.section--fog .section-no{color:var(--wine)}
.section-rule{
  width:100%;
  height:14px;
  background:var(--sub-teal);
  border-radius:2px;
  clip-path:polygon(0 45%,100% 0,100% 100%,0 100%);
  opacity:.85;
}
.section-rule--flip{clip-path:polygon(0 0,100% 55%,100% 100%,0 100%)}
.section-title{
  font-size:clamp(28px,3.4vw,38px);
  font-weight:900;
  letter-spacing:-.035em;
  line-height:1.1;
}
.section-lead{
  max-width:34em;
  font-size:16px;
  line-height:1.8;
  color:var(--steel);
}
.section--lane .section-lead,
.section--wine .section-lead,
.section--indigo .section-lead{color:#C9D8E6}

/* ---------- prose ---------- */
.prose{
  max-width:34em;
  font-size:17px;
  line-height:1.85;
}
.prose > * + *{margin-top:1.1em}
.prose h2{font-size:28px;margin-top:1.6em}
.prose h3{font-size:21px;margin-top:1.4em;letter-spacing:-.02em}
.prose ul,
.prose ol{list-style:none;display:flex;flex-direction:column;gap:10px}
.prose li{
  position:relative;
  padding-left:22px;
}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;
  top:11px;
  width:8px;
  height:2px;
  background:var(--sub-teal);
}
.prose ol{counter-reset:prose-ol}
.prose ol li{counter-increment:prose-ol}
.prose ol li::before{
  content:counter(prose-ol,decimal-leading-zero);
  position:absolute;
  left:0;
  top:0;
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--mint);
  background:none;
  width:auto;
  height:auto;
}
.prose--fog{color:var(--ink)}
.prose--fog h2,.prose--fog h3{color:var(--ink)}
.prose--fog ul li::before{background:var(--wine)}
.prose a{
  color:var(--sub-teal);
  border-bottom:1px solid rgba(46,196,182,.45);
}
.prose a:hover{color:var(--mint);border-color:var(--mint)}

/* ---------- note / legend / divider ---------- */
.note{
  font-family:var(--font-mono);
  font-size:14px;
  line-height:1.7;
  letter-spacing:.02em;
  color:var(--steel);
}
.legend{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--steel);
}
.legend-dot{
  width:10px;
  height:10px;
  border-radius:50%;
  background:var(--steel);
  flex:none;
}
.legend-dot--live{background:var(--leyu-orange)}
.legend-dot--sub{background:var(--sub-teal)}
.legend-dot--soft{background:var(--teal-soft)}
.legend-dot--wine{background:#E0779B}
.divider{
  height:1px;
  background:rgba(159,179,200,.22);
  border:0;
  margin:0;
}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  padding:4px 12px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  white-space:nowrap;
}
.tag--live{background:var(--leyu-orange);color:#fff}
.tag--sub{background:var(--sub-teal);color:var(--abyss);font-weight:700}
.tag--soft{background:rgba(168,230,223,.18);color:var(--teal-soft);border-color:rgba(168,230,223,.4)}
.section--fog .tag--soft{background:rgba(46,196,182,.14);color:#12726B;border-color:rgba(46,196,182,.35)}

/* ---------- stat ---------- */
.stat{
  display:flex;
  align-items:baseline;
  gap:10px;
  flex-wrap:wrap;
}
.stat-value{
  font-family:var(--font-mono);
  font-size:clamp(38px,5vw,56px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--mint);
}
.stat-label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--steel);
  text-transform:uppercase;
}
.stat-unit{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--steel);
}
.section--fog .stat-value{color:var(--wine)}
.section--fog .stat-label,
.section--fog .stat-unit{color:#4A5A6B}

/* ---------- cards ---------- */
.card{
  background:var(--lane-blue);
  border-radius:var(--radius-md);
  padding:26px 24px;
  border:1px solid rgba(159,179,200,.14);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.card:hover{
  transform:translateY(-2px);
  box-shadow:0 14px 32px rgba(0,0,0,.28);
  border-color:rgba(46,196,182,.4);
}
.card--fog{
  background:#fff;
  color:var(--ink);
  border-color:rgba(14,20,32,.1);
}
.card-title{
  font-size:19px;
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.3;
  margin-bottom:10px;
}
.card--fog .card-title{color:var(--ink)}
.card-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--steel);
  margin-bottom:12px;
}
.card--fog .card-meta{color:#4A5A6B}

/* ---------- figure ---------- */
.figure{
  margin:0;
  border-radius:var(--radius-md);
  overflow:hidden;
  background:var(--lane-blue);
  border:1px solid rgba(159,179,200,.14);
}
.figure-media{
  position:relative;
  aspect-ratio:16/10;
  background:
    radial-gradient(120% 80% at 20% 10%,rgba(46,196,182,.28),transparent 60%),
    radial-gradient(90% 70% at 85% 90%,rgba(255,107,44,.22),transparent 65%),
    linear-gradient(160deg,var(--lane-blue),var(--deep-sea));
  overflow:hidden;
}
.figure-media img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure--wide .figure-media{aspect-ratio:21/9}
.figure--square .figure-media{aspect-ratio:1/1}
.figure-caption{
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.7;
  letter-spacing:.02em;
  color:var(--steel);
  padding:12px 18px;
  border-top:1px solid rgba(159,179,200,.14);
}
.section--fog .figure{background:#DCE4EA;border-color:rgba(14,20,32,.1)}
.section--fog .figure-caption{color:#4A5A6B;border-top-color:rgba(14,20,32,.1)}

/* ---------- crumbs / pager / trust ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:28px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--steel);
}
.crumb-link{color:var(--steel);transition:color .18s var(--ease)}
.crumb-link:hover{color:var(--mint)}
.crumb-sep{color:rgba(159,179,200,.5)}
.pager{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin-top:36px;
}
.pager-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  padding:10px 20px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(159,179,200,.4);
  color:var(--text-on-deep);
  transition:border-color .18s var(--ease),background .18s var(--ease),transform .18s var(--ease);
}
.pager-link::after{content:"↗"}
.pager-link:hover{border-color:var(--sub-teal);background:rgba(46,196,182,.14);transform:translateY(-2px)}
.section--fog .pager-link{border-color:rgba(14,20,32,.25);color:var(--ink)}
.section--fog .pager-link:hover{border-color:var(--wine);background:rgba(122,31,61,.08)}
.trust-line{
  display:flex;
  align-items:flex-start;
  gap:14px;
  border-top:1px solid rgba(159,179,200,.28);
  border-bottom:1px solid rgba(159,179,200,.28);
  padding:18px 0;
  margin:36px 0;
  font-size:15px;
  line-height:1.75;
  color:var(--text-on-deep);
}
.trust-line::before{
  content:"";
  flex:none;
  width:10px;
  height:10px;
  margin-top:9px;
  border-radius:50%;
  background:var(--sub-teal);
}
.section--fog .trust-line{border-color:rgba(14,20,32,.16);color:var(--ink)}
.section--fog .trust-line::before{background:var(--wine)}

/* ---------- footer ---------- */
.site-footer{
  background:var(--abyss);
  color:var(--text-on-deep);
  border-top:1px solid rgba(159,179,200,.16);
  padding:64px 0 40px;
}
.footer-inner{
  max-width:var(--max-w);
  margin:0 auto;
  padding:0 var(--gutter);
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);
  gap:48px 64px;
}
.footer-brand{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:14px;
}
.brand-mark--footer{font-size:26px;letter-spacing:-.04em}
.brand-meta--footer{color:var(--mint)}
.footer-note{
  font-size:14px;
  line-height:1.75;
  color:var(--steel);
  max-width:26em;
}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:32px;
}
.footer-col-title{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.12em;
  color:var(--steel);
  margin-bottom:16px;
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  font-size:15px;
  color:var(--text-on-deep);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-link:hover{color:var(--warm-orange);padding-left:4px}
.footer-meta{
  grid-column:1 / -1;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 24px;
  padding-top:28px;
  border-top:1px solid rgba(159,179,200,.16);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.03em;
  color:var(--steel);
}
.footer-meta p{margin:0}
.footer-contact{color:var(--teal-soft)}
.footer-legal{color:rgba(159,179,200,.8)}

/* ---------- reveal ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .layout-shell{grid-template-columns:72px minmax(0,1fr)}
  .rail{top:88px}
  .nav-dock{gap:18px}
  .nav-actions{padding-left:18px;gap:12px}
  .nav-link{font-size:14px;padding:8px 10px}
}
@media (max-width:900px){
  .layout-shell{grid-template-columns:1fr}
  .rail{display:none}
  .footer-inner{grid-template-columns:1fr;gap:40px}
  .footer-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:820px){
  .site-header .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:9px 18px;
    border-radius:var(--radius-pill);
    border:1px solid rgba(159,179,200,.45);
    color:var(--text-on-deep);
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.08em;
    transition:border-color .18s var(--ease),background .18s var(--ease);
  }
  .nav-toggle-bar{
    display:block;
    width:14px;
    height:2px;
    background:var(--text-on-deep);
    transition:transform .2s var(--ease),opacity .2s var(--ease);
  }
  .nav-toggle[data-open]{
    border-color:var(--sub-teal);
    background:rgba(46,196,182,.14);
  }
  .nav-toggle[data-open] .nav-toggle-bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
  .nav-toggle[data-open] .nav-toggle-bar:nth-child(2){transform:translateY(-1px) rotate(-45deg)}
  .nav-toggle[data-open] .nav-toggle-label{color:var(--mint)}
  .nav-panel{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    flex-direction:column;
    background:var(--abyss);
    border-bottom:1px solid rgba(159,179,200,.22);
    padding:16px var(--gutter) 28px;
    max-height:calc(100vh - 72px);
    overflow-y:auto;
  }
  .nav-panel[data-open]{display:flex}
  .nav-dock{
    flex-direction:column;
    align-items:stretch;
    gap:22px;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:2px;
  }
  .nav-link{
    display:block;
    font-size:16px;
    padding:12px 4px;
    border-radius:8px;
  }
  .nav-link::after{left:4px;right:auto;width:0;bottom:8px}
  .nav-link[aria-current="page"]::after{transform:scaleX(1);width:28px}
  .nav-link[aria-current="page"]::before{top:17px;left:-8px}
  .nav-actions{
    flex-direction:column;
    align-items:stretch;
    gap:12px;
    padding-left:0;
    padding-top:18px;
    border-left:0;
    border-top:1px solid rgba(159,179,200,.22);
  }
  .nav-cta{width:100%;font-size:15px;padding:14px 20px}
  .nav-utility{text-align:center;font-size:13px;padding:4px 0}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  body{font-size:16px}
  .page-main{padding-bottom:64px}
  .section{padding:48px 0}
  .section--lane,
  .section--wine,
  .section--indigo,
  .section--fog{padding:40px 22px;margin:24px 0;border-radius:var(--radius-md)}
  .section-title{font-size:26px}
  .section-head{margin-bottom:26px}
  .section-rule{height:10px}
  .footer-inner{padding:0 20px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-meta{flex-direction:column;align-items:flex-start;gap:8px;font-size:12px}
  .card{padding:22px 18px}
  .crumbs{padding-top:20px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .scroll-progress{display:none}
}