*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--deep);
  color:var(--white);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
:root{
  --deep:#061A2E;
  --night:#0B2745;
  --graphite:#101418;
  --cyan:#22D3EE;
  --cyan-soft:#67E8F9;
  --lava:#FB5A1E;
  --amber:#FDBA74;
  --white:#F4F7FB;
  --mist:#8CA3B8;
  --line:#1E3A5F;
  --on-lava:#180703;
  --wrap:1200px;
  --header-h:76px;
  --r-lg:22px;
  --r-md:14px;
  --r-sm:9px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-num:"JetBrains Mono","Rajdhani",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:900;letter-spacing:-.02em;line-height:1.22;margin:0 0 .5em}
h1{font-size:clamp(34px,5vw,54px)}
h2{font-size:clamp(26px,3.4vw,38px)}
h3{font-size:clamp(20px,2.2vw,24px)}
p{margin:0 0 1.1em}
a{color:var(--cyan-soft)}
img{max-width:100%;display:block}
::selection{background:var(--lava);color:#fff}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:5px}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{
  position:absolute;left:16px;top:-70px;z-index:120;
  background:var(--cyan);color:#04121F;font-weight:700;
  padding:10px 18px;border-radius:0 0 var(--r-sm) var(--r-sm);
  text-decoration:none;transition:top .18s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(6,26,46,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  transition:background-color .2s var(--ease),box-shadow .2s var(--ease);
}
.site-header[data-stuck="true"]{
  background:rgba(6,26,46,.99);
  box-shadow:0 14px 34px rgba(2,8,16,.55);
}
.header-inner{
  max-width:var(--wrap);margin:0 auto;padding:0 24px;
  min-height:var(--header-h);
  display:flex;align-items:center;gap:22px;
}
.brand{
  display:inline-flex;align-items:center;gap:12px;
  color:var(--white);text-decoration:none;flex:0 0 auto;
}
.brand-mark{
  position:relative;width:36px;height:36px;flex:0 0 auto;
  border-radius:12px 4px 12px 4px;
  background:var(--night);border:1px solid var(--line);overflow:hidden;
}
.brand-mark::before{
  content:"";position:absolute;right:-9px;bottom:-11px;width:28px;height:28px;
  background:var(--cyan);border-radius:50%;opacity:.92;
}
.brand-mark::after{
  content:"";position:absolute;left:7px;top:7px;width:3px;height:15px;
  background:var(--lava);border-radius:2px;transform:skewX(-16deg);
}
.brand-text{display:block}
.brand-name{display:block;font-family:var(--font-head);font-weight:900;font-size:19px;letter-spacing:-.02em;line-height:1.25}
.brand-tagline{
  display:block;font-family:var(--font-num);font-size:10.5px;line-height:1.5;
  letter-spacing:.14em;color:var(--mist);
}
.nav-area{
  margin-left:auto;display:flex;align-items:center;gap:26px;
}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-item{position:relative}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:7px;
  padding:10px 13px;border-radius:var(--r-sm);
  color:var(--white);text-decoration:none;
  font-size:15px;font-weight:500;letter-spacing:.01em;
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.nav-link:hover{color:var(--cyan-soft);background:rgba(34,211,238,.08)}
.nav-num{font-family:var(--font-num);font-size:10px;letter-spacing:.06em;color:var(--mist);transition:color .16s var(--ease)}
.nav-link:hover .nav-num{color:var(--amber)}
.nav-link[aria-current="page"]{color:var(--cyan-soft)}
.nav-link[aria-current="page"] .nav-num{color:var(--lava)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:13px;right:13px;bottom:3px;height:2px;
  background:var(--cyan);border-radius:2px;
}
.nav-link[aria-current="page"]::before{
  content:"";position:absolute;right:5px;top:9px;width:5px;height:5px;
  background:var(--lava);border-radius:50%;
}
.nav-toggle{
  display:none;align-items:center;gap:11px;
  margin-left:auto;padding:9px 14px;
  background:transparent;border:1px solid var(--line);border-radius:var(--r-sm);
  color:var(--white);font-family:var(--font-num);font-size:12.5px;letter-spacing:.12em;
  cursor:pointer;transition:border-color .16s var(--ease),color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan-soft)}
.nav-toggle-label{line-height:1}
.nav-toggle-bars{position:relative;display:block;width:18px;height:2px;background:var(--cyan);border-radius:2px;transition:background-color .2s var(--ease)}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--cyan);
  border-radius:2px;transition:transform .2s var(--ease);
}
.nav-toggle-bars::before{top:-6px}
.nav-toggle-bars::after{top:6px}
.site-header[data-open="true"] .nav-toggle-bars{background:transparent}
.site-header[data-open="true"] .nav-toggle-bars::before{transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle-bars::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:999px;border:1px solid transparent;
  font-family:var(--font-body);font-size:14.5px;font-weight:700;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn-primary{background:var(--lava);color:var(--on-lava)}
.btn-primary:hover{background:var(--amber);color:var(--on-lava);transform:translateY(-1px)}
.btn-ghost{border-color:var(--line);color:var(--cyan-soft)}
.btn-ghost:hover{border-color:var(--cyan);background:rgba(34,211,238,.1)}
.header-cta{flex:0 0 auto;white-space:nowrap}

/* ---------- Footer ---------- */
.site-footer{
  position:relative;background:var(--graphite);
  border-top:1px solid var(--line);color:var(--white);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;height:3px;width:min(420px,46%);background:var(--cyan);
}
.site-footer::after{
  content:"";position:absolute;top:-1px;left:min(420px,46%);height:3px;width:78px;background:var(--lava);
}
.footer-inner{max-width:var(--wrap);margin:0 auto;padding:58px 24px 34px}
.footer-top{
  display:grid;grid-template-columns:1fr 2.1fr;gap:48px;
  padding-bottom:38px;border-bottom:1px solid var(--line);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer-brand-name{margin:0;font-family:var(--font-head);font-weight:900;font-size:22px;letter-spacing:-.02em}
.footer-tagline{
  margin:0;font-family:var(--font-num);font-size:11px;letter-spacing:.16em;color:var(--mist);line-height:1.6;
}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.footer-col{min-width:0}
.footer-col-title{
  margin:0 0 14px;font-size:12.5px;font-weight:700;letter-spacing:.18em;
  color:var(--cyan-soft);
}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.footer-links a{
  color:var(--white);text-decoration:none;font-size:15px;opacity:.84;
  transition:color .16s var(--ease),opacity .16s var(--ease);
}
.footer-links a:hover,.footer-links a:focus-visible{color:var(--cyan-soft);opacity:1}
.footer-meta{
  display:flex;flex-wrap:wrap;gap:14px 30px;justify-content:space-between;
  padding-top:24px;color:var(--mist);font-size:13.5px;
}
.footer-contact{margin:0;max-width:64ch;line-height:1.7}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px;margin:0;font-family:var(--font-num);letter-spacing:.02em}
.footer-icp{color:var(--cyan-soft)}
.footer-copy{color:var(--mist)}

/* ---------- Layout ---------- */
.container{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.container-narrow{width:100%;max-width:820px;margin:0 auto;padding:0 24px}
.section{padding:74px 0}
.section-band{background:var(--night);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:70ch;margin-bottom:34px}
.eyebrow{
  display:inline-block;margin:0 0 12px;
  font-family:var(--font-num);font-size:12px;letter-spacing:.24em;color:var(--cyan);
}
.section-title{margin:0 0 14px;font-size:clamp(26px,3.4vw,38px)}
.section-note{margin:0;color:var(--mist);max-width:68ch}
.lede{font-size:19px;line-height:1.75;color:var(--white);max-width:70ch}
.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:28px}
.g-3{grid-column:span 3}
.g-4{grid-column:span 4}
.g-5{grid-column:span 5}
.g-6{grid-column:span 6}
.g-7{grid-column:span 7}
.g-8{grid-column:span 8}
.g-9{grid-column:span 9}
.g-12{grid-column:span 12}
.divider{height:1px;border:0;margin:0;background:var(--line)}

/* ---------- Breadcrumb ---------- */
.breadcrumb{margin:0 0 22px}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;list-style:none;margin:0;padding:0}
.breadcrumb li{display:flex;align-items:center;gap:8px;font-family:var(--font-num);font-size:12.5px;letter-spacing:.06em;color:var(--mist)}
.breadcrumb li+li::before{content:"/";color:var(--line)}
.breadcrumb a{color:var(--mist);text-decoration:none}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--cyan-soft)}
.breadcrumb [aria-current="page"]{color:var(--cyan-soft)}

/* ---------- Prose ---------- */
.prose{max-width:74ch}
.prose h2{font-size:clamp(23px,2.6vw,30px);margin:1.6em 0 .6em}
.prose h3{font-size:20px;margin:1.5em 0 .5em}
.prose p{margin:0 0 1.15em}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.35em}
.prose li{margin:0 0 .5em}
.prose a{color:var(--cyan-soft);text-decoration:underline;text-underline-offset:3px}
.prose strong{color:var(--white);font-weight:700}
.prose code{
  font-family:var(--font-num);font-size:.9em;background:var(--night);
  border:1px solid var(--line);border-radius:6px;padding:.12em .45em;
}

/* ---------- Cards / Stats / Tags ---------- */
.card{
  background:var(--night);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:24px;min-width:0;
}
.card-title{margin:0 0 8px;font-size:19px}
.card-note{margin:0;color:var(--mist);font-size:15px}
.stat-row{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(158px,1fr))}
.stat{
  position:relative;overflow:hidden;background:var(--graphite);
  border:1px solid var(--line);border-radius:var(--r-md);padding:18px 20px;
}
.stat::before{content:"";position:absolute;left:0;top:0;width:3px;height:100%;background:var(--cyan)}
.stat--accent::before{background:var(--lava)}
.stat-value{
  display:block;font-family:var(--font-num);font-weight:700;
  font-size:clamp(28px,3.4vw,44px);line-height:1.06;color:var(--white);letter-spacing:-.01em;
}
.stat-value--accent{color:var(--lava)}
.stat-label{
  display:block;margin-top:6px;font-family:var(--font-num);
  font-size:12.5px;letter-spacing:.1em;color:var(--mist);
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-num);font-size:12px;letter-spacing:.08em;
  padding:4px 10px;border-radius:999px;
  background:rgba(34,211,238,.12);border:1px solid rgba(34,211,238,.32);color:var(--cyan-soft);
}
.tag--accent{
  background:rgba(251,90,30,.14);border-color:rgba(251,90,30,.38);color:var(--amber);
}

/* ---------- Media ---------- */
.media-frame{
  position:relative;overflow:hidden;border-radius:var(--r-lg);
  border:1px solid var(--line);background-color:var(--night);
  background-image:repeating-linear-gradient(135deg,rgba(140,163,184,.1) 0 1px,transparent 1px 16px);
  aspect-ratio:16/9;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--wide{aspect-ratio:21/9}
.media-caption{
  margin:10px 0 0;font-family:var(--font-num);font-size:13px;letter-spacing:.04em;color:var(--mist);
}

/* ---------- Tabs ---------- */
.tabs{min-width:0}
.tab-list{
  display:flex;flex-wrap:wrap;gap:6px;
  border-bottom:1px solid var(--line);
}
.tab{
  appearance:none;background:transparent;border:1px solid transparent;border-bottom:2px solid transparent;
  padding:11px 17px;border-radius:10px 10px 0 0;
  color:var(--mist);font-family:var(--font-body);font-size:14.5px;font-weight:700;
  cursor:pointer;transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.tab:hover{color:var(--white)}
.tab[aria-selected="true"]{
  color:var(--cyan-soft);border-bottom-color:var(--lava);background:rgba(34,211,238,.08);
}
.tab-panel{padding-top:26px}
.tab-panel[hidden]{display:none}

/* ---------- Motion utilities ---------- */
[data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .58s var(--ease),transform .58s var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}
.scroll-progress{
  position:fixed;top:0;left:0;width:100%;height:2px;z-index:90;
  transform:scaleX(0);transform-origin:0 50%;
  background:var(--cyan);pointer-events:none;
}
.to-top{
  position:fixed;right:22px;bottom:22px;z-index:70;
  width:46px;height:46px;border-radius:50%;
  display:grid;place-items:center;
  background:var(--graphite);border:1px solid var(--line);color:var(--cyan-soft);
  font-family:var(--font-num);font-size:17px;line-height:1;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),visibility .2s;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--cyan);color:var(--white)}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .g-3,.g-4,.g-5,.g-6{grid-column:span 6}
  .g-7,.g-8,.g-9{grid-column:span 12}
  .footer-top{grid-template-columns:1fr;gap:34px}
  .footer-grid{grid-template-columns:repeat(2,1fr);gap:26px}
}
@media (max-width:900px){
  :root{--header-h:68px}
  .nav-toggle{display:inline-flex}
  .nav-area{
    position:fixed;left:0;right:0;top:var(--header-h);
    display:flex;flex-direction:column;align-items:stretch;gap:14px;
    padding:20px 24px 28px;
    background:var(--graphite);border-bottom:1px solid var(--line);
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);pointer-events:none;
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s;
  }
  .site-header[data-open="true"] .nav-area{
    opacity:1;visibility:visible;transform:none;pointer-events:auto;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    padding:13px 6px;font-size:16px;border-bottom:1px solid rgba(30,58,95,.65);border-radius:0;
  }
  .nav-link[aria-current="page"]::after{left:6px;right:auto;width:22px;bottom:8px}
  .header-cta{width:100%;margin-top:6px}
  .section{padding:56px 0}
  .footer-inner{padding:44px 24px 30px}
  .footer-meta{flex-direction:column;gap:14px}
}
@media (max-width:680px){
  body{font-size:16px}
  .container,.container-narrow{padding:0 18px}
  .header-inner{padding:0 18px;gap:14px}
  .brand-tagline{display:none}
  .g-3,.g-4,.g-5,.g-6{grid-column:span 12}
  .footer-grid{grid-template-columns:1fr}
  .footer-links a{font-size:15.5px}
  .to-top{right:14px;bottom:14px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::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}
}