:root{
  --deep:#0A1B2E;
  --stand:#10263D;
  --line:#2A4C6B;
  --signal:#FF6B1F;
  --signal-soft:#FFA968;
  --pitch:#34B27B;
  --ice:#E6EAEE;
  --paper:#F5F8FA;
  --ink:#0C1116;
  --mist:#8FA6B8;
  --rail-w:236px;
  --topbar-h:68px;
  --font-display:"Barlow Condensed","Oswald","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-body:Inter,"Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --shadow-hard:8px 8px 0 rgba(0,0,0,.45);
  --ease:cubic-bezier(.2,.7,.2,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--topbar-h) + 20px);}
html.is-nav-open{overflow:hidden;}
body{
  margin:0;
  background-color:var(--deep);
  background-image:
    repeating-linear-gradient(0deg,rgba(42,76,107,.32) 0 1px,transparent 1px 48px),
    repeating-linear-gradient(90deg,rgba(42,76,107,.32) 0 1px,transparent 1px 48px);
  background-attachment:fixed;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;}
h1,h2,h3,h4,p,figure,blockquote{margin:0;}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.12;letter-spacing:.01em;}
a{color:var(--signal-soft);}
ul,ol{margin:0;padding:0;}
::selection{background:var(--signal);color:var(--ink);}
:focus-visible{outline:3px solid var(--signal);outline-offset:2px;}

main{
  margin-left:var(--rail-w);
  padding-top:var(--topbar-h);
  min-height:100vh;
}
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 24px;}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px;}
.span-4{grid-column:span 4;}
.span-5{grid-column:span 5;}
.span-6{grid-column:span 6;}
.span-7{grid-column:span 7;}
.span-8{grid-column:span 8;}
.span-12{grid-column:span 12;}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--signal-soft);
}
.eyebrow::before{content:"";width:20px;height:2px;background:currentColor;flex:none;}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em;}
.prose{max-width:68ch;color:#D3DFE8;}
.prose p+p{margin-top:1em;}
.prose h2,.prose h3{margin-top:1.6em;color:var(--paper);}

.panel{
  background:var(--stand);
  border:2px solid var(--line);
  box-shadow:var(--shadow-hard);
  padding:24px;
}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;text-transform:uppercase;
  padding:11px 20px;border:2px solid transparent;text-decoration:none;cursor:pointer;
  box-shadow:4px 4px 0 rgba(0,0,0,.5);
  transition:background-color .12s,color .12s,border-color .12s,box-shadow .12s,transform .12s;
}
.btn--signal{background:var(--signal);color:var(--ink);border-color:var(--signal);}
.btn--signal:hover{background:var(--signal-soft);border-color:var(--signal-soft);box-shadow:6px 6px 0 rgba(0,0,0,.5);transform:translate(-1px,-1px);}
.btn--ghost{background:transparent;color:var(--paper);border-color:var(--line);}
.btn--ghost:hover{border-color:var(--signal);color:var(--signal-soft);box-shadow:6px 6px 0 rgba(0,0,0,.5);transform:translate(-1px,-1px);}

.chip{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  padding:7px 12px;border:2px solid var(--line);background:transparent;
  color:var(--ice);cursor:pointer;text-decoration:none;
  transition:background-color .12s,color .12s,border-color .12s;
}
.chip:hover{border-color:var(--signal-soft);color:var(--paper);}
.chip[aria-pressed="true"],.chip.is-active{background:var(--signal);border-color:var(--signal);color:var(--ink);}

.crumbs{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--mist);padding:20px 0;}
.crumbs ol{display:flex;flex-wrap:wrap;gap:8px;list-style:none;}
.crumbs a{color:var(--ice);text-decoration:none;border-bottom:1px solid var(--line);}
.crumbs a:hover{color:var(--signal-soft);border-bottom-color:var(--signal-soft);}
.crumbs li+li::before{content:"/";color:var(--line);margin-right:8px;}
.crumbs [aria-current="page"]{color:var(--signal-soft);}

.media-frame{
  position:relative;display:block;overflow:hidden;
  border:2px solid var(--line);background:var(--stand);
  box-shadow:var(--shadow-hard);aspect-ratio:16/9;
}
.media-frame__img{display:block;width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.06);}
.media-frame__badge{
  position:absolute;top:0;right:0;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  background:var(--signal);color:var(--ink);padding:5px 10px;
}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--tall{aspect-ratio:4/5;}
.media-frame--square{aspect-ratio:1/1;}

.reveal{opacity:0;transform:translateY(16px);transition:opacity .32s var(--ease),transform .32s var(--ease);}
.reveal.is-in{opacity:1;transform:none;}

/* ---------- header ---------- */
.site-header{position:relative;z-index:40;}
.leyu-skip{
  position:fixed;top:10px;left:10px;z-index:90;
  transform:translateY(-180%);
  background:var(--signal);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;text-decoration:none;
  padding:10px 16px;border:2px solid var(--ink);
  transition:transform .2s var(--ease);
}
.leyu-skip:focus{transform:translateY(0);}

.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:80;
  background:rgba(42,76,107,.5);pointer-events:none;
}
.scroll-progress__bar{display:block;height:100%;width:0;background:var(--signal);transition:width .1s linear;}

.rail-brand{
  position:fixed;top:0;left:0;z-index:50;
  width:var(--rail-w);height:var(--topbar-h);
  display:flex;flex-direction:column;justify-content:center;gap:2px;
  padding:10px 18px;text-decoration:none;
  background:var(--stand);
  border-right:2px solid var(--line);border-bottom:2px solid var(--line);
}
.rail-brand__mark{
  font-family:var(--font-display);font-weight:800;font-size:26px;
  letter-spacing:.14em;line-height:1;color:var(--paper);
  transition:color .12s;
}
.rail-brand:hover .rail-brand__mark{color:var(--signal-soft);}
.rail-brand__meta{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--mist);
}

.site-topbar{
  position:fixed;top:0;left:var(--rail-w);right:0;z-index:45;
  height:var(--topbar-h);
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:0 20px;
  background:rgba(10,27,46,.95);
  border-bottom:2px solid var(--line);
}
.topbar__status{display:flex;gap:12px;align-items:center;margin:0;}
.status-pill{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--mist);
  padding:5px 10px;border:1px solid var(--line);background:rgba(16,38,61,.65);
}
.status-dot{width:7px;height:7px;border-radius:50%;background:var(--pitch);box-shadow:0 0 0 3px rgba(52,178,123,.18);flex:none;}
.topbar__actions{display:flex;align-items:center;gap:10px;}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  background:transparent;border:2px solid var(--line);color:var(--paper);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;
  padding:9px 12px;cursor:pointer;
  transition:border-color .12s,color .12s,background-color .12s;
}
.nav-toggle:hover{border-color:var(--signal);color:var(--signal-soft);}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px;}
.nav-toggle__bars i{display:block;height:2px;background:currentColor;transition:transform .2s var(--ease),opacity .2s var(--ease);}
.nav-toggle[aria-expanded="true"]{border-color:var(--signal);color:var(--signal-soft);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

.site-rail{
  position:fixed;top:var(--topbar-h);left:0;bottom:0;z-index:44;
  width:var(--rail-w);
  display:flex;flex-direction:column;
  padding:22px 14px 20px;
  background:rgba(16,38,61,.94);
  border-right:2px solid var(--line);
  overflow-y:auto;
}
.rail-nav__list{list-style:none;display:flex;flex-direction:column;gap:2px;}
.rail-nav__link{
  display:flex;align-items:baseline;gap:10px;
  padding:11px 12px;
  border-left:2px solid transparent;
  color:var(--mist);text-decoration:none;
  font-size:15px;line-height:1.3;font-weight:500;
  transition:background-color .12s,color .12s,border-color .12s,box-shadow .12s;
}
.rail-nav__index{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:#5D7C95;transition:color .12s;
}
.rail-nav__link:hover{
  background:#16324D;border-left:4px solid var(--signal);color:var(--paper);
  box-shadow:4px 4px 0 rgba(0,0,0,.4);
}
.rail-nav__link:hover .rail-nav__index{color:var(--signal-soft);}
.rail-nav__link[aria-current="page"]{
  background:var(--deep);border-left:4px solid var(--signal);color:var(--paper);
}
.rail-nav__link[aria-current="page"] .rail-nav__index{color:var(--signal);}
.rail-note{
  margin-top:auto;padding:12px 6px 0;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:#5D7C95;border-top:2px dashed var(--line);
}
.rail-scrim{display:none;}

/* ---------- footer ---------- */
.site-footer{
  margin-left:var(--rail-w);
  background:var(--stand);
  border-top:2px solid var(--line);
  color:var(--ice);
}
.footer-inner{max-width:1180px;margin:0 auto;padding:56px 24px 32px;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px;}
.footer-brand__mark{
  font-family:var(--font-display);font-weight:800;font-size:32px;
  letter-spacing:.14em;line-height:1;color:var(--paper);
}
.footer-brand__meta{
  margin-top:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--signal-soft);
}
.footer-brand__note{margin-top:12px;font-size:14px;line-height:1.7;color:var(--mist);max-width:32ch;}
.footer-col__title{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--mist);padding-bottom:9px;border-bottom:2px solid var(--line);
}
.footer-list{list-style:none;margin-top:14px;display:grid;gap:9px;}
.footer-list a,.footer-static{
  font-size:15px;color:var(--ice);text-decoration:none;
  border-bottom:1px solid transparent;transition:color .12s,border-color .12s;
}
.footer-list a:hover{color:var(--signal-soft);border-bottom-color:var(--signal-soft);}
.footer-static{font-family:var(--font-mono);font-size:13px;color:var(--mist);}
.footer-legal{
  margin-top:44px;padding-top:22px;border-top:2px solid var(--line);
  display:grid;gap:8px;
  font-family:var(--font-mono);font-size:12px;line-height:1.8;letter-spacing:.03em;color:var(--mist);
}
.footer-legal__line{color:var(--ice);}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  :root{--rail-w:206px;}
  .rail-brand__mark{font-size:23px;}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;row-gap:32px;}
}

@media (max-width:900px){
  :root{--topbar-h:60px;}
  main{margin-left:0;}
  .site-footer{margin-left:0;}
  .wrap{padding:0 18px;}
  .grid-12{gap:16px;}
  .span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 12;}

  .rail-brand{
    width:auto;max-width:52%;height:var(--topbar-h);
    border-right:none;padding:8px 14px;z-index:52;
  }
  .rail-brand__mark{font-size:22px;letter-spacing:.12em;}
  .rail-brand__meta{font-size:10px;}

  .site-topbar{left:0;padding:0 14px 0 118px;}

  .nav-toggle{display:inline-flex;}
  .topbar__status .status-pill:last-child{display:none;}

  .site-rail{
    top:auto;left:0;right:0;bottom:0;width:auto;
    max-height:82vh;
    padding:18px 16px calc(20px + env(safe-area-inset-bottom));
    border-right:none;border-top:2px solid var(--signal);
    border-radius:10px 10px 0 0;
    background:#10263D;
    transform:translateY(103%);
    transition:transform .3s var(--ease);
    z-index:70;
  }
  .site-header[data-open] .site-rail{transform:translateY(0);}
  .rail-nav__list{display:grid;grid-template-columns:1fr 1fr;gap:6px;}
  .rail-nav__link{font-size:14px;padding:12px 10px;border-left-width:0;border-bottom:2px solid var(--line);}
  .rail-nav__link:hover,.rail-nav__link[aria-current="page"]{
    border-left-width:0;border-bottom-color:var(--signal);box-shadow:none;
  }
  .rail-note{margin-top:16px;padding-top:12px;}

  .rail-scrim{
    display:block;position:fixed;inset:0;z-index:65;
    background:rgba(6,14,22,.72);
    opacity:0;visibility:hidden;
    transition:opacity .24s var(--ease),visibility .24s var(--ease);
  }
  .site-header[data-open] .rail-scrim{opacity:1;visibility:visible;}

  .footer-inner{padding:44px 18px 28px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
}

@media (max-width:600px){
  body{font-size:16px;}
  .site-topbar{padding-left:110px;gap:10px;}
  .rail-brand{padding-left:12px;}
  .topbar__status{display:none;}
  .topbar__actions{margin-left:auto;}
  .btn{padding:10px 14px;font-size:12px;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-brand__note{max-width:none;}
  .rail-nav__list{grid-template-columns:1fr;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
  .reveal{opacity:1;transform:none;}
  .site-rail,.rail-scrim{transition:none;}
}