:root{
  --ink:#071522;
  --panel:#0C2233;
  --slate:#12384F;
  --cream:#F3EBDD;
  --mist:#E4DAC6;
  --brown:#1A1512;
  --cyan:#5AE0FF;
  --orange:#FF6A2B;
  --grey:#9FB3C2;
  --fog:#D7E3EA;
  --line:rgba(90,224,255,.18);
  --line-soft:rgba(215,227,234,.12);
  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --shell:1440px;
  --gutter:24px;
  --header-h:76px;
  --radius:2px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 20px)}
body{
  margin:0;
  min-height:100vh;
  background:var(--ink);
  color:var(--fog);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{margin:0;font-family:var(--font-display);font-weight:700;line-height:1.06;letter-spacing:-.01em;color:var(--fog)}
p{margin:0}
img,svg{max-width:100%}
a{color:var(--cyan);text-decoration:none}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
::selection{background:var(--cyan);color:var(--ink)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.num,.data-figure,.plaque-value{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.wrap{width:min(var(--shell),calc(100% - var(--gutter) * 2));margin-inline:auto}
.section{padding:clamp(48px,7vw,96px) 0}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;top:8px;left:8px;z-index:200;
  transform:translateY(-240%);
  padding:10px 16px;
  background:var(--cyan);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;
  border-radius:var(--radius);
  transition:transform .2s ease;
}
.skip-link:focus{transform:none}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background:rgba(7,21,34,.94);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.hdr-progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(90,224,255,.08);pointer-events:none}
.hdr-progress > span{
  display:block;height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transform:scaleX(var(--progress,0));transform-origin:0 50%;
  transition:transform .15s linear;
}
.hdr-inner{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  width:min(var(--shell),calc(100% - var(--gutter) * 2));
  margin-inline:auto;padding:14px 0;
  transition:padding .24s ease;
}
.site-header.is-dense .hdr-inner{padding:8px 0}
.hdr-left{display:flex;align-items:center;gap:18px;min-width:0}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--fog)}
.brand-mark{
  position:relative;display:block;flex:0 0 auto;
  width:30px;height:30px;
  border:1px solid rgba(90,224,255,.55);
  background:rgba(90,224,255,.05);
}
.brand-mark::before{
  content:"";position:absolute;inset:6px;
  background:linear-gradient(135deg,var(--cyan),rgba(90,224,255,0) 70%);
  clip-path:polygon(0 0,100% 0,0 100%);
}
.brand-mark::after{
  content:"";position:absolute;right:-4px;bottom:-4px;
  width:8px;height:8px;background:var(--orange);
}
.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand-name{font-family:var(--font-display);font-size:19px;font-weight:700;line-height:1.1;letter-spacing:.06em;color:#fff;white-space:nowrap}
.brand-sub{font-family:var(--font-mono);font-size:10px;line-height:1.4;letter-spacing:.2em;color:var(--grey);white-space:nowrap}
.hdr-meta{
  display:flex;align-items:center;gap:8px;margin:0;padding-left:18px;
  border-left:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--grey);
  white-space:nowrap;
}
.hdr-dot{width:6px;height:6px;background:var(--cyan);box-shadow:0 0 8px rgba(90,224,255,.8)}
.hdr-right{display:flex;align-items:center;gap:10px}
.nav{display:flex;align-items:center;gap:6px}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{position:relative}
.nav-link{
  position:relative;display:inline-flex;align-items:center;gap:7px;
  padding:10px 12px;
  color:var(--fog);font-size:14px;line-height:1.2;white-space:nowrap;
  transition:color .2s ease;
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left center;
  transition:transform .24s ease,background-color .24s ease;
}
.nav-link:hover{color:#fff}
.nav-link:hover::after{transform:scaleX(1);background:var(--orange)}
.nav-link[aria-current="page"]{color:#fff}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--cyan)}
.nav-link[aria-current="page"] .nav-num{color:var(--cyan)}
.nav-num{font-family:var(--font-mono);font-size:10px;letter-spacing:.08em;color:var(--grey)}
.hdr-cta{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  margin-left:10px;padding:10px 16px;
  border:1px solid rgba(255,106,43,.6);border-radius:var(--radius);
  color:var(--orange);background:rgba(255,106,43,.06);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;white-space:nowrap;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.hdr-cta::before{content:"";width:5px;height:5px;background:var(--orange);box-shadow:0 0 8px rgba(255,106,43,.85);transition:background-color .2s ease,box-shadow .2s ease}
.hdr-cta:hover{background:var(--orange);border-color:var(--orange);color:#160a04}
.hdr-cta:hover::before{background:#160a04;box-shadow:none}
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:10px 14px;
  border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);color:var(--fog);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  cursor:pointer;
}
.nav-toggle:hover{border-color:rgba(90,224,255,.55);color:#fff}
.nav-toggle-bars{
  display:block;width:16px;height:12px;
  background:
    linear-gradient(var(--cyan),var(--cyan)) 0 0/100% 2px no-repeat,
    linear-gradient(var(--cyan),var(--cyan)) 0 5px/100% 2px no-repeat,
    linear-gradient(var(--cyan),var(--cyan)) 0 10px/100% 2px no-repeat;
  transition:background-position .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{
  background:
    linear-gradient(var(--orange),var(--orange)) 0 5px/100% 2px no-repeat,
    linear-gradient(var(--orange),var(--orange)) 0 5px/100% 2px no-repeat,
    linear-gradient(var(--orange),var(--orange)) 0 5px/100% 2px no-repeat;
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,8vw,120px);
  background:var(--panel);
  color:var(--fog);
  border-top:1px solid rgba(90,224,255,.22);
}
.ftr-scan{
  height:2px;
  background:linear-gradient(90deg,rgba(90,224,255,0),var(--cyan) 22%,rgba(90,224,255,.25) 62%,rgba(90,224,255,0));
}
.ftr-inner{width:min(var(--shell),calc(100% - var(--gutter) * 2));margin-inline:auto;padding:clamp(36px,5vw,60px) 0 26px}
.ftr-top{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:clamp(24px,4vw,48px)}
.ftr-col{min-width:0}
.ftr-name{margin:0 0 12px;font-family:var(--font-display);font-size:24px;font-weight:700;letter-spacing:.04em;color:#fff}
.ftr-desc{margin:0 0 18px;max-width:36ch;font-size:14px;line-height:1.8;color:var(--grey)}
.ftr-contact{margin:0 0 16px;font-style:normal;font-size:14px;line-height:1.9;color:var(--grey)}
.ftr-contact p{margin:0;overflow-wrap:anywhere}
.ftr-note{
  margin:0;padding-left:12px;
  border-left:2px solid var(--orange);
  font-size:12px;line-height:1.75;color:var(--grey);
}
.ftr-label{
  display:flex;align-items:center;gap:10px;margin:0 0 16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;color:var(--cyan);
}
.ftr-label::after{content:"";flex:1;height:1px;background:var(--line-soft)}
.ftr-list{display:grid;gap:9px}
.ftr-legal{grid-template-columns:repeat(2,minmax(0,1fr))}
.ftr-link{
  display:inline-block;
  color:var(--fog);font-size:14px;line-height:1.6;
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.ftr-link:hover{color:var(--cyan);border-bottom-color:rgba(90,224,255,.55)}
.ftr-bottom{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;
  margin-top:clamp(28px,4vw,44px);padding-top:18px;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--grey);
}
.ftr-copy,.ftr-icp{margin:0}
.to-top{
  position:fixed;right:22px;bottom:22px;z-index:80;
  display:inline-flex;align-items:center;justify-content:center;
  width:46px;height:46px;
  border:1px solid rgba(90,224,255,.5);border-radius:var(--radius);
  background:rgba(12,34,51,.94);color:var(--cyan);
  font-family:var(--font-mono);font-size:16px;line-height:1;
  cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .24s ease,transform .24s ease,visibility .24s ease,border-color .2s ease;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--orange);color:var(--orange)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 22px;
  border:1px solid transparent;border-radius:var(--radius);
  background:transparent;color:var(--fog);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;
  cursor:pointer;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.btn--solid{background:var(--cyan);border-color:var(--cyan);color:var(--ink);font-weight:700}
.btn--solid:hover{background:#8decff;border-color:#8decff}
.btn--ghost{border-color:rgba(90,224,255,.42);color:var(--cyan)}
.btn--ghost:hover{border-color:var(--cyan);background:rgba(90,224,255,.08)}
.btn--accent{background:var(--orange);border-color:var(--orange);color:#160a04;font-weight:700}
.btn--accent:hover{background:#ff824f;border-color:#ff824f}

/* ---------- breadcrumb ---------- */
.breadcrumb{margin:0 0 6px}
.breadcrumb-list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--grey);
}
.breadcrumb-list li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-list li + li::before{content:"/";color:rgba(159,179,194,.5)}
.breadcrumb-list a{color:var(--grey)}
.breadcrumb-list a:hover{color:var(--cyan)}
.breadcrumb-list [aria-current="page"]{color:var(--fog)}

/* ---------- chapter band ---------- */
.chapter-band{
  display:grid;grid-template-columns:auto 1fr;gap:6px 16px;align-items:end;
  padding:16px 0 22px;border-bottom:1px solid var(--line);
}
.chapter-num{font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;color:var(--cyan)}
.chapter-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;color:var(--grey)}
.chapter-title{grid-column:1 / -1;margin:6px 0 0;font-size:clamp(2rem,4.4vw,3.4rem)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;margin:0 0 12px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;color:var(--cyan);
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--cyan)}

/* ---------- cards & data ---------- */
.plaque{
  position:relative;
  padding:20px;
  background:var(--panel);
  border:1px solid var(--line-soft);border-radius:var(--radius);
  box-shadow:inset 0 1px 0 rgba(215,227,234,.04);
  transition:border-color .24s ease;
}
.plaque:hover{border-color:rgba(90,224,255,.45)}
.plaque-label{
  margin:0 0 10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--grey);
}
.plaque-value{margin:0;font-size:clamp(2rem,4vw,3.2rem);line-height:1;color:var(--cyan)}
.plaque-text{margin:10px 0 0;font-size:14px;line-height:1.7;color:var(--grey)}
.data-figure{
  margin:0;font-size:clamp(2.6rem,7vw,5rem);line-height:1;
  color:var(--cyan);letter-spacing:-.02em;
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  border:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--cyan);
}
.tag--alert{border-color:rgba(255,106,43,.55);background:rgba(255,106,43,.08);color:var(--orange)}
.rule{height:1px;margin:40px 0;border:0;background:var(--line-soft)}

/* ---------- grid ---------- */
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:20px}
.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:1 / -1}

/* ---------- cream reading panel ---------- */
.cream-panel{
  padding:clamp(24px,4vw,56px);
  background:var(--cream);color:var(--brown);
  border-radius:var(--radius);
  box-shadow:0 30px 60px -40px rgba(0,0,0,.75);
}
.cream-panel h2,.cream-panel h3,.cream-panel h4{color:var(--brown)}
.cream-panel .eyebrow{color:#a63f12}
.cream-panel .eyebrow::before{background:#a63f12}
.prose{max-width:68ch;font-size:17px;line-height:1.85}
.prose p{margin:0 0 1.1em}
.prose p:last-child{margin-bottom:0}
.prose a{color:#0d5c78;text-decoration:underline;text-underline-offset:3px}
.prose strong{color:var(--brown)}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.2em;list-style:disc}
.prose li{margin:0 0 .4em}

/* ---------- media ---------- */
.media-frame{
  position:relative;display:block;margin:0;
  aspect-ratio:16 / 9;overflow:hidden;
  background:linear-gradient(135deg,var(--slate),var(--panel) 58%,var(--ink));
  border:1px solid var(--line-soft);border-radius:var(--radius);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(90deg,rgba(90,224,255,.09),rgba(90,224,255,0) 55%),
    repeating-linear-gradient(90deg,rgba(215,227,234,0) 0 79px,rgba(215,227,234,.05) 79px 80px);
}
.media-frame img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-caption{margin:10px 0 0;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--grey)}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .4s ease,transform .4s ease}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .hdr-meta{display:none}
  .nav-link{padding:9px 9px;font-size:13px}
  .nav-link::after{left:9px;right:9px}
}
@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .nav{
    position:absolute;top:100%;left:0;right:0;
    display:flex;flex-direction:column;align-items:stretch;gap:14px;
    padding:18px var(--gutter) 24px;
    background:var(--panel);
    border-bottom:1px solid var(--line);
    box-shadow:0 24px 40px -24px rgba(0,0,0,.8);
    opacity:0;visibility:hidden;transform:translateY(-10px);pointer-events:none;
    transition:opacity .24s ease,transform .24s ease,visibility .24s ease;
  }
  .nav[data-open]{opacity:1;visibility:visible;transform:none;pointer-events:auto}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .nav-item{border-bottom:1px solid var(--line-soft)}
  .nav-link{width:100%;padding:14px 4px;font-size:16px}
  .nav-link::after{left:4px;right:auto;width:26px;bottom:8px}
  .hdr-cta{margin-left:0;padding:13px 16px}
  .ftr-top{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  .span-4,.span-5,.span-6,.span-7,.span-8{grid-column:1 / -1}
  .grid{gap:16px}
  .hdr-inner{gap:14px}
}
@media (max-width:640px){
  :root{--gutter:16px;--header-h:68px}
  body{font-size:16px}
  .brand-name{font-size:17px}
  .brand-sub{font-size:9px;letter-spacing:.16em}
  .brand-mark{width:26px;height:26px}
  .ftr-top{grid-template-columns:1fr}
  .ftr-legal{grid-template-columns:1fr}
  .ftr-bottom{flex-direction:column;align-items:flex-start}
  .to-top{right:14px;bottom:14px;width:42px;height:42px}
}
@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}
  html{scroll-behavior:auto}
}