:root{
  --abyss:#050A16;
  --panel:#0B1730;
  --indigo:#161C4A;
  --teal:#062A2E;
  --cyan:#3FE3D2;
  --orange:#FF7A1A;
  --amber:#FFC24B;
  --ice:#EDF3F9;
  --mist:#A6B6C9;
  --wine:#5C1B37;
  --hairline:#22314D;
  --font-display:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,sans-serif;
  --font-serif:"Source Han Serif SC","Noto Serif SC","Songti SC",Georgia,serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --rail:1560px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
body{
  margin:0;
  background:var(--abyss);
  color:var(--ice);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4,h5,p,figure{margin:0}
h1{font-family:var(--font-display);font-weight:900;font-size:clamp(32px,5vw,64px);line-height:1.1;letter-spacing:-.02em;color:var(--ice)}
h2{font-family:var(--font-display);font-weight:800;font-size:clamp(24px,3.2vw,38px);line-height:1.25;letter-spacing:-.015em;color:var(--ice)}
h3{font-family:var(--font-serif);font-weight:600;font-size:clamp(20px,2.2vw,26px);line-height:1.45;color:var(--ice)}
::selection{background:var(--cyan);color:#050A16}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}

/* ---------- layout utilities ---------- */
.container{width:100%;max-width:1240px;margin-inline:auto;padding-inline:clamp(18px,4vw,48px)}
.section{position:relative;padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(26px,4vw,52px)}
.rule{height:1px;border:0;margin:0;background:var(--hairline)}
.grid{display:grid;gap:clamp(18px,3vw,38px)}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:900px){
  .grid--7-5,.grid--8-4,.grid--3{grid-template-columns:1fr}
}

/* ---------- typography atoms ---------- */
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--cyan)}
.eyebrow::before{content:"";width:24px;height:1px;background:currentColor}
.data-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--cyan);background:rgba(6,42,46,.5);border:1px solid rgba(63,227,210,.4)}
.tag--orange{color:var(--orange);background:rgba(255,122,26,.1);border-color:rgba(255,122,26,.5)}
.tag--amber{color:var(--amber);background:rgba(255,194,75,.1);border-color:rgba(255,194,75,.45)}

/* ---------- buttons & chips ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:13px 26px;font-family:var(--font-display);font-size:14px;font-weight:700;letter-spacing:.04em;border:1px solid transparent;transition:transform .2s ease,background .2s ease,color .2s ease,border-color .2s ease}
.btn--primary{background:linear-gradient(135deg,var(--orange),#FF9A4D);color:#050A16;clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px)}
.btn--primary:hover{transform:translateY(-2px);filter:brightness(1.07)}
.btn--ghost{color:var(--cyan);background:rgba(6,42,46,.35);border-color:rgba(63,227,210,.5)}
.btn--ghost:hover{color:var(--ice);background:rgba(63,227,210,.14)}
.btn--small{padding:9px 16px;font-size:12px}
.btn--primary:focus-visible{outline:2px solid var(--ice);outline-offset:-5px}
.chip{display:inline-flex;align-items:center;gap:8px;padding:9px 16px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--mist);background:rgba(11,23,48,.6);border:1px solid var(--hairline);transition:color .2s ease,border-color .2s ease,background .2s ease}
.chip:hover{color:var(--ice);border-color:rgba(63,227,210,.5)}
.chip[aria-pressed="true"],.chip.is-active{color:#050A16;background:var(--cyan);border-color:var(--cyan)}

/* ---------- panels ---------- */
.panel{position:relative;padding:clamp(18px,2.4vw,30px);background:var(--panel);border:1px solid var(--hairline)}
.panel--cut{clip-path:polygon(0 0,calc(100% - 26px) 0,100% 26px,100% 100%,0 100%)}
.panel--teal{background:linear-gradient(150deg,var(--teal),#04141A);border-color:rgba(63,227,210,.22)}
.panel--indigo{background:linear-gradient(160deg,var(--indigo),#0B1230);border-color:rgba(99,113,214,.22)}
.panel--wine{background:linear-gradient(160deg,var(--wine),#2A0D1B);border-color:rgba(255,122,26,.18)}

/* ---------- breadcrumb ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding-block:18px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:rgba(166,182,201,.8)}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:rgba(63,227,210,.55)}
.breadcrumb a{color:var(--mist)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--cyan)}

/* ---------- prose ---------- */
.prose{max-width:38em;font-size:16px;line-height:1.8;color:rgba(237,243,249,.9)}
.prose>*+*{margin-top:1.1em}
.prose h2{margin-top:1.9em;font-family:var(--font-serif);font-weight:600;font-size:clamp(22px,2.6vw,30px);line-height:1.45;color:var(--ice)}
.prose h3{font-family:var(--font-display);font-weight:800;font-size:18px;line-height:1.5;color:var(--ice)}
.prose p{color:rgba(237,243,249,.86)}
.prose ul,.prose ol{list-style:disc;padding-left:1.3em}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.4em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(63,227,210,.4)}
.prose strong{color:var(--ice);font-weight:700}
.prose blockquote{margin:1.6em 0;padding-left:18px;border-left:2px solid var(--orange);font-family:var(--font-serif);font-size:18px;color:var(--mist)}

/* ---------- media frames ---------- */
.media-frame{position:relative;overflow:hidden;aspect-ratio:16/9;background:linear-gradient(140deg,var(--panel),var(--teal));border:1px solid var(--hairline)}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{content:"";position:absolute;inset:0;box-shadow:inset 0 0 0 1px rgba(63,227,210,.12);pointer-events:none}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-caption{margin-top:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:rgba(166,182,201,.8)}

/* ---------- skip link ---------- */
.skip-link{position:fixed;top:-90px;left:14px;z-index:300;padding:11px 20px;font-family:var(--font-display);font-size:13px;font-weight:800;letter-spacing:.06em;color:#04121A;background:var(--cyan);transition:top .22s ease}
.skip-link:focus{top:12px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:120;
  color:var(--ice);
  background:linear-gradient(180deg,rgba(5,10,22,.96),rgba(5,10,22,.9));
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--hairline);
}
.header-progress{position:absolute;top:0;left:0;right:0;height:2px;background:rgba(63,227,210,.08);pointer-events:none;z-index:3}
.header-progress-bar{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;background:linear-gradient(90deg,var(--cyan),var(--amber))}
.header-notice{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  max-height:44px;overflow:hidden;
  padding:8px clamp(16px,4vw,44px);
  background:linear-gradient(90deg,rgba(6,42,46,.9),rgba(11,23,48,.4) 52%,rgba(5,10,22,0));
  border-bottom:1px solid rgba(34,49,77,.75);
  transition:max-height .3s ease,padding .3s ease,opacity .3s ease,border-color .3s ease;
}
.site-header.is-condensed .header-notice{max-height:0;padding-block:0;opacity:0;border-color:transparent}
.notice-text{display:flex;align-items:center;gap:9px;font-size:12px;letter-spacing:.04em;color:var(--mist)}
.notice-dot{flex:none;width:6px;height:6px;border-radius:50%;background:var(--orange);box-shadow:0 0 0 3px rgba(255,122,26,.16)}
.notice-meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:rgba(166,182,201,.7);white-space:nowrap}
.header-bar{
  position:relative;
  display:flex;align-items:center;justify-content:space-between;gap:clamp(12px,2vw,32px);
  width:100%;max-width:var(--rail);margin-inline:auto;
  padding:12px clamp(16px,4vw,44px);
}
.brand-lockup{display:flex;align-items:center;gap:12px;flex:none}
.brand-mark{position:relative;width:28px;height:28px;flex:none;background:conic-gradient(from 200deg,var(--cyan),var(--indigo) 55%,var(--orange));clip-path:polygon(0 0,100% 0,100% 62%,72% 100%,0 100%);transition:transform .3s ease}
.brand-mark::after{content:"";position:absolute;inset:7px;background:var(--abyss);clip-path:polygon(0 0,100% 0,100% 62%,72% 100%,0 100%)}
.brand-lockup:hover .brand-mark{transform:rotate(-90deg)}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:19px;letter-spacing:-.02em;color:var(--ice)}
.brand-suffix{margin-top:3px;font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;color:var(--cyan)}
.site-nav{display:flex;align-items:center;gap:clamp(12px,1.6vw,26px)}
.nav-list{display:flex;align-items:center;gap:clamp(8px,1.3vw,22px)}
.nav-item{display:flex}
.nav-link{position:relative;display:inline-flex;align-items:center;padding:10px 2px;font-size:14px;font-weight:500;letter-spacing:.01em;color:var(--mist);transition:color .2s ease}
.nav-link::after{content:"";position:absolute;left:0;right:100%;bottom:2px;height:2px;background:var(--cyan);transition:right .3s ease,background .3s ease}
.nav-link:hover,.nav-link:focus-visible{color:var(--ice)}
.nav-link:hover::after,.nav-link:focus-visible::after{right:0}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{right:0;background:var(--orange)}
.nav-dot{display:inline-block;flex:none;width:0;height:8px;border-radius:50%;background:var(--cyan);opacity:0;margin-right:0;transition:width .28s ease,opacity .28s ease,margin .28s ease,box-shadow .28s ease}
.nav-label{display:inline-block;white-space:nowrap;transition:opacity .2s ease}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 20px;flex:none;
  font-family:var(--font-display);font-size:13px;font-weight:800;letter-spacing:.06em;
  color:#04121A;background:linear-gradient(135deg,var(--orange),#FF9A4D);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  transition:transform .2s ease,filter .2s ease;
}
.nav-cta:hover{transform:translateY(-1px);filter:brightness(1.08)}
.nav-cta:focus-visible{outline:2px solid var(--ice);outline-offset:-5px}
.nav-toggle{display:none;align-items:center;gap:10px;padding:9px 14px;font-size:13px;letter-spacing:.08em;color:var(--ice);background:rgba(11,23,48,.75);border:1px solid var(--hairline)}
.nav-toggle-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--mist)}
.nav-toggle-icon{position:relative;width:18px;height:12px;flex:none}
.nav-toggle-icon::before,.nav-toggle-icon::after{content:"";position:absolute;left:0;right:0;height:2px;background:var(--cyan);transition:transform .25s ease,top .25s ease}
.nav-toggle-icon::before{top:0}
.nav-toggle-icon::after{top:10px}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before{top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after{top:5px;transform:rotate(-45deg)}

/* condensed index: dots + floating labels */
.site-header.is-condensed .nav-link{padding:12px 6px}
.site-header.is-condensed .nav-dot{width:8px;opacity:1;box-shadow:0 0 0 4px rgba(63,227,210,.1)}
.site-header.is-condensed .nav-link[aria-current="page"] .nav-dot{background:var(--orange);box-shadow:0 0 0 4px rgba(255,122,26,.14)}
.site-header.is-condensed .nav-label{
  position:absolute;top:calc(100% + 8px);left:50%;z-index:6;
  padding:5px 10px;font-size:12px;white-space:nowrap;
  color:var(--ice);background:var(--panel);border:1px solid var(--hairline);
  opacity:0;pointer-events:none;transform:translate(-50%,-6px);
  transition:opacity .2s ease,transform .2s ease;
}
.site-header.is-condensed .nav-item:hover .nav-label,
.site-header.is-condensed .nav-link:focus-visible .nav-label{opacity:1;transform:translate(-50%,0)}

@media (max-width:980px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    display:none;flex-direction:column;align-items:stretch;gap:0;
    padding:8px clamp(16px,5vw,32px) 22px;
    background:rgba(6,11,24,.99);
    border-bottom:1px solid var(--hairline);
    box-shadow:0 26px 44px -22px #000;
    max-height:calc(100vh - 96px);max-height:calc(100dvh - 96px);overflow-y:auto;
  }
  .site-nav[data-open="true"]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .nav-item{border-bottom:1px solid rgba(34,49,77,.6)}
  .nav-link{width:100%;justify-content:space-between;padding:15px 4px;font-size:15px;color:var(--ice)}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--cyan)}
  .nav-dot{display:none}
  .nav-cta{margin-top:18px;padding:14px 20px;font-size:14px}
  .site-header.is-condensed .nav-link{padding:15px 4px}
  .site-header.is-condensed .nav-label{position:static;opacity:1;transform:none;padding:0;border:0;background:none;font-size:15px;color:inherit}
  .site-header.is-condensed .nav-link[aria-current="page"] .nav-label{color:var(--cyan)}
  .brand-name{font-size:17px}
  .notice-meta{display:none}
  .notice-text{font-size:11px}
}
@media (max-width:520px){
  .brand-mark{width:24px;height:24px}
  .brand-name{font-size:16px}
  .header-bar{padding-block:10px}
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(56px,8vw,110px);
  padding:clamp(48px,7vw,88px) 0 30px;
  color:var(--ice);
  border-top:1px solid var(--hairline);
  background:
    radial-gradient(90% 120% at 100% 0%,rgba(22,28,74,.85) 0%,rgba(5,10,22,0) 62%),
    radial-gradient(70% 100% at 0% 100%,rgba(6,42,46,.9) 0%,rgba(5,10,22,0) 62%),
    linear-gradient(180deg,#060C1A 0%,#050A16 58%,#04070F 100%);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;
  width:min(46%,540px);height:100%;
  background:linear-gradient(160deg,rgba(92,27,55,.45),rgba(92,27,55,0) 72%);
  clip-path:polygon(0 0,100% 0,42% 100%,0 100%);
  pointer-events:none;
}
.footer-arc{position:absolute;right:-150px;bottom:-170px;width:460px;height:460px;border:1px solid rgba(63,227,210,.18);border-radius:50%;pointer-events:none}
.footer-arc::after{content:"";position:absolute;inset:64px;border:1px dashed rgba(255,122,26,.22);border-radius:50%}
.footer-inner{position:relative;z-index:1}
.footer-top{display:flex;flex-direction:column;gap:12px;padding-bottom:clamp(26px,4vw,44px);border-bottom:1px solid var(--hairline)}
.footer-kicker{font-family:var(--font-mono);font-size:11px;letter-spacing:.28em;text-transform:uppercase;color:var(--cyan)}
.footer-closing{font-family:var(--font-serif);font-weight:600;font-size:clamp(26px,4.4vw,46px);line-height:1.25;letter-spacing:-.01em;color:var(--ice)}
.footer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr)) 1.5fr;gap:clamp(24px,3.5vw,48px);padding:clamp(30px,4vw,52px) 0}
.footer-col{min-width:0}
.footer-col-title{margin-bottom:14px;padding-bottom:9px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.2em;color:var(--mist);border-bottom:1px solid rgba(34,49,77,.85)}
.footer-link-list{display:grid;gap:10px}
.footer-link{display:inline-flex;align-items:center;font-size:14px;color:var(--mist);transition:color .2s ease}
.footer-link::before{content:"";width:0;height:1px;margin-right:0;background:var(--cyan);transition:width .25s ease,margin .25s ease}
.footer-link:hover,.footer-link:focus-visible{color:var(--ice)}
.footer-link:hover::before,.footer-link:focus-visible::before{width:14px;margin-right:8px}
.footer-contact{
  display:flex;flex-direction:column;gap:11px;min-width:0;
  padding:clamp(16px,2.2vw,24px);
  background:rgba(11,23,48,.72);
  border:1px solid var(--hairline);
  clip-path:polygon(0 0,calc(100% - 24px) 0,100% 24px,100% 100%,0 100%);
}
.contact-line{display:flex;flex-wrap:wrap;align-items:baseline;gap:2px 12px;font-size:14px}
.contact-line--stack{align-items:flex-start}
.contact-label{flex:none;min-width:62px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--cyan)}
.contact-value{min-width:0;color:var(--ice);word-break:break-word}
.contact-note{margin-top:2px;font-size:12px;line-height:1.7;color:rgba(166,182,201,.82)}
.copy-btn{align-self:flex-start;display:inline-flex;align-items:center;gap:8px;padding:8px 14px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--cyan);background:rgba(6,42,46,.55);border:1px solid rgba(63,227,210,.45);transition:color .2s ease,background .2s ease,border-color .2s ease}
.copy-btn:hover{color:var(--ice);background:rgba(63,227,210,.16);border-color:var(--cyan)}
.copy-btn[data-copied="true"]{color:var(--amber);border-color:rgba(255,194,75,.65);background:rgba(255,194,75,.12)}
.copy-btn-text{display:inline-block}
.copy-status{position:absolute}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px 20px;padding-top:22px;border-top:1px solid var(--hairline)}
.footer-icp{font-size:12px;letter-spacing:.04em;color:rgba(166,182,201,.78)}
.legal-links{display:flex;flex-wrap:wrap;gap:18px}
.legal-link{font-size:12px;color:var(--mist);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.legal-link:hover,.legal-link:focus-visible{color:var(--cyan);border-color:rgba(63,227,210,.6)}
.to-top{
  position:fixed;right:clamp(14px,3vw,32px);bottom:clamp(14px,3vw,32px);z-index:140;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--cyan);
  background:rgba(11,23,48,.92);border:1px solid rgba(63,227,210,.42);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .25s ease,transform .25s ease,visibility .25s ease,color .2s ease;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{color:var(--ice);border-color:var(--cyan)}
.to-top:focus-visible{outline:2px solid var(--ice);outline-offset:-4px}
.to-top-arrow{width:8px;height:8px;border-left:2px solid currentColor;border-top:2px solid currentColor;transform:rotate(45deg)}
.to-top-text{display:inline-block}

@media (max-width:1024px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact{grid-column:span 2}
}
@media (max-width:620px){
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-contact{grid-column:auto}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .footer-arc{right:-200px;bottom:-220px}
}

/* ---------- motion preferences ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
}