:root{
  --ink:#0B0F1F;
  --indigo:#141B3D;
  --indigo-raised:#232C63;
  --paper:#F4F1EA;
  --gold:#C9A253;
  --gold-soft:#E8D5A3;
  --jade:#2FD3A8;
  --cinnabar:#C0392B;
  --violet:#6C5CE7;
  --text:#10131F;
  --muted:#5B6480;
  --muted-dark:#96A0BF;
  --line-gold:rgba(201,162,83,.26);
  --rail-w:68px;
  --bar-h:60px;
  --shell:1180px;
  --radius-lg:24px;
  --radius-md:15px;
  --radius-pill:999px;
  --ease:cubic-bezier(.2,.8,.2,1);
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--bar-h) + 18px)}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    repeating-linear-gradient(135deg,rgba(255,255,255,.016) 0 1px,transparent 1px 10px),
    radial-gradient(900px 520px at 84% -10%,rgba(108,92,231,.16),transparent 62%),
    radial-gradient(760px 460px at 2% 6%,rgba(201,162,83,.10),transparent 60%);
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%}
h1,h2,h3,h4,p,figure,blockquote{margin: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}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.3}
h1{font-weight:900;font-size:clamp(28px,4.6vw,44px);line-height:1.16;letter-spacing:-.02em}
:focus-visible{outline:2px solid var(--jade);outline-offset:3px;border-radius:6px}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.muted{color:var(--muted-dark)}

.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(16px,3.4vw,40px)}
.section{padding-block:clamp(34px,5.4vw,72px)}
.section-head{display:flex;flex-direction:column;gap:12px;margin-bottom:clamp(18px,2.6vw,30px)}
.kicker{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold)}
.kicker::before{content:"";width:24px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--gold),var(--jade))}
.section-title{font-family:var(--font-display);font-weight:900;font-size:clamp(23px,3.4vw,33px);line-height:1.22;letter-spacing:-.01em;padding-left:14px;border-left:4px solid var(--gold)}
.lede{font-size:16.5px;line-height:1.85;color:#B7BFD8;max-width:62ch}
.prose p + p{margin-top:1em}

.grid{display:grid;gap:clamp(14px,2vw,22px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(270px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:var(--radius-pill);border:1px solid transparent;font-weight:700;font-size:14.5px;line-height:1.2;cursor:pointer;text-align:center;transition:transform .08s var(--ease),box-shadow .12s var(--ease),background-color .12s var(--ease),color .12s var(--ease),border-color .12s var(--ease)}
.btn:active{transform:translateY(2px)}
.btn--gold{background:linear-gradient(135deg,var(--gold-soft),var(--gold));color:#1A1206;border-color:rgba(201,162,83,.9);box-shadow:0 8px 22px rgba(201,162,83,.22)}
.btn--gold:hover{box-shadow:0 10px 28px rgba(201,162,83,.34)}
.btn--ghost{background:transparent;color:var(--gold-soft);border-color:rgba(201,162,83,.6)}
.btn--ghost:hover{background:rgba(201,162,83,.12);border-color:var(--gold)}
.btn--jade{background:var(--jade);color:#04241C;border-color:rgba(47,211,168,.8)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 11px;border-radius:var(--radius-pill);border:1px solid currentColor;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--gold-soft)}
.tag--jade{color:var(--jade)}
.tag--cinnabar{color:#EE7C6B}
.tag--violet{color:#A99BFF}

.crumbs{display:flex;flex-wrap:wrap;align-items:center;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--muted-dark)}
.crumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:9px}
.crumbs-item{display:inline-flex;align-items:center;gap:9px}
.crumbs-item + .crumbs-item::before{content:"/";color:rgba(201,162,83,.6)}
.crumbs a:hover{color:var(--gold-soft)}
.crumbs [aria-current="page"]{color:var(--gold-soft)}

.media-frame{position:relative;overflow:hidden;border-radius:var(--radius-md);border:1px solid var(--line-gold);background:linear-gradient(145deg,#141B3D 0%,#232C63 52%,#0B0F1F 100%);isolation:isolate}
.media-frame::before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(135deg,rgba(255,255,255,.05) 0 1px,transparent 1px 9px);pointer-events:none}
.media-frame::after{content:"";position:absolute;inset:auto -10% -40% -10%;height:70%;background:radial-gradient(closest-side,rgba(47,211,168,.22),transparent 72%);pointer-events:none}
.media-frame img,.media-frame svg{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--wide{aspect-ratio:21/9}

.card{background:linear-gradient(165deg,rgba(35,44,99,.94),rgba(20,27,61,.94));border:1px solid var(--line-gold);border-radius:var(--radius-lg);padding:clamp(16px,2.4vw,26px);transition:border-color .12s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease)}
.card:hover{border-color:var(--gold);box-shadow:0 18px 40px rgba(4,7,18,.45)}
.card--paper{background:var(--paper);color:var(--text);border-color:rgba(16,19,31,.12)}
.card-title{font-family:var(--font-display);font-size:19px;font-weight:700;line-height:1.4}
.card-text{color:#AEB6D2;font-size:15px;line-height:1.8}
.card--paper .card-text{color:var(--muted)}

.paper{position:relative;background-color:var(--paper);color:var(--text);border-radius:var(--radius-lg);padding:clamp(20px,3vw,40px);box-shadow:0 24px 60px rgba(4,7,18,.45);background-image:linear-gradient(rgba(16,19,31,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(16,19,31,.045) 1px,transparent 1px);background-size:26px 26px}
.paper .lede{color:#3F4760}
.paper .kicker{color:#8A6A22}
.paper .muted{color:var(--muted)}
.paper .section-title{border-left-color:var(--gold)}

.accordion{border:1px solid var(--line-gold);border-radius:var(--radius-lg);overflow:hidden;background:rgba(20,27,61,.72)}
.acc-item + .acc-item{border-top:1px solid rgba(201,162,83,.18)}
.acc-trigger{display:flex;align-items:center;gap:12px;width:100%;padding:16px 18px;text-align:left;cursor:pointer;font-family:var(--font-display);font-weight:700;font-size:16px;line-height:1.5;color:var(--paper);transition:background-color .12s var(--ease),color .12s var(--ease)}
.acc-trigger:hover{background:rgba(35,44,99,.85)}
.acc-trigger[aria-expanded="true"]{background:rgba(35,44,99,.92);color:var(--gold-soft)}
.acc-icon{position:relative;flex:0 0 auto;margin-left:auto;width:18px;height:18px;border-radius:50%;border:1px solid rgba(201,162,83,.7)}
.acc-icon::before,.acc-icon::after{content:"";position:absolute;left:50%;top:50%;background:var(--gold-soft)}
.acc-icon::before{width:9px;height:1.5px;transform:translate(-50%,-50%)}
.acc-icon::after{width:1.5px;height:9px;transform:translate(-50%,-50%);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.acc-trigger[aria-expanded="true"] .acc-icon::after{transform:translate(-50%,-50%) scaleY(0);opacity:0}
.acc-panel{padding:0 18px 18px;color:#B6BDD6;font-size:15.5px;line-height:1.85;animation:accIn .22s var(--ease) both}
.acc-panel[hidden]{display:none}
@keyframes accIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}

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

/* ---------- skip link ---------- */
.skip-link{position:fixed;top:8px;left:8px;z-index:200;padding:10px 18px;border-radius:var(--radius-pill);background:var(--gold);color:#1A1206;font-weight:700;font-size:14px;transform:translateY(-180%);transition:transform .2s var(--ease)}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:var(--ink)}
.scroll-meter{position:absolute;left:0;right:0;top:0;height:2px;background:rgba(201,162,83,.14)}
.scroll-meter__fill{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--gold),var(--jade))}
.header-bar{
  position:relative;z-index:2;display:flex;align-items:center;gap:clamp(10px,2vw,24px);
  min-height:var(--bar-h);padding:0 clamp(14px,3vw,30px);
  border-bottom:1px solid var(--line-gold);
  background-image:
    repeating-linear-gradient(135deg,rgba(255,255,255,.022) 0 1px,transparent 1px 9px),
    linear-gradient(180deg,#0B0F1F 0%,#111834 100%);
  box-shadow:0 1px 0 rgba(47,211,168,.08);
  transition:min-height .22s var(--ease);
}
.site-header.is-condensed .header-bar{min-height:44px}
.site-header.is-condensed .brand-mark{width:30px;height:30px}
.site-header.is-condensed .brand-sub{opacity:0}

.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;color:var(--paper)}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;border:1px solid rgba(201,162,83,.75);background:linear-gradient(150deg,rgba(201,162,83,.24),rgba(47,211,168,.10));box-shadow:inset 0 0 0 1px rgba(11,15,31,.65);transition:width .22s var(--ease),height .22s var(--ease)}
.brand-mark__core{width:12px;height:12px;border-radius:3px;background:var(--gold);transform:rotate(45deg);box-shadow:0 0 12px rgba(201,162,83,.7)}
.brand-text{display:flex;flex-direction:column;line-height:1.16}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:17px;letter-spacing:.05em}
.brand-sub{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;color:var(--gold-soft);transition:opacity .2s var(--ease)}

.header-meta{display:flex;align-items:center;gap:10px;margin-left:auto}
.seal{display:inline-flex;align-items:center;gap:7px;padding:5px 13px 5px 10px;border-radius:var(--radius-pill);border:1px solid rgba(201,162,83,.55);background:linear-gradient(120deg,rgba(201,162,83,.18),rgba(47,211,168,.08));font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--gold-soft);white-space:nowrap}
.seal-dot{width:6px;height:6px;border-radius:50%;background:var(--jade);box-shadow:0 0 0 3px rgba(47,211,168,.18);flex:0 0 auto}

.nav-toggle{display:inline-flex;align-items:center;gap:8px;padding:8px 13px;border-radius:var(--radius-pill);border:1px solid rgba(201,162,83,.5);background:rgba(20,27,61,.9);font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--paper);cursor:pointer;transition:border-color .12s var(--ease),background-color .12s var(--ease),transform .08s var(--ease)}
.nav-toggle:hover{border-color:var(--gold)}
.nav-toggle:active{transform:translateY(2px)}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars span{display:block;height:1.5px;border-radius:2px;background:var(--gold-soft);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.site-header[data-open] .nav-toggle-bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

.nav{
  position:absolute;top:100%;left:0;right:0;z-index:3;
  display:flex;flex-direction:column;align-items:stretch;gap:6px;
  padding:14px clamp(14px,4vw,24px) 22px;
  background:linear-gradient(180deg,#0E1430 0%,#0B0F1F 72%);
  border-bottom:1px solid rgba(201,162,83,.4);
  box-shadow:0 26px 50px rgba(4,7,18,.62);
  max-height:calc(100vh - var(--bar-h));
  max-height:calc(100dvh - var(--bar-h));
  overflow-y:auto;
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s var(--ease);
}
.site-header[data-open] .nav{opacity:1;visibility:visible;transform:none}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-link{position:relative;display:flex;align-items:center;gap:9px;padding:12px 14px;border-radius:14px;font-size:16px;font-weight:500;color:#C7CCDE;transition:color .12s var(--ease),background-color .12s var(--ease),box-shadow .12s var(--ease)}
.nav-index{font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;color:rgba(232,213,163,.55)}
.nav-link:hover{color:#fff;background:rgba(35,44,99,.72);box-shadow:inset 0 0 0 1px rgba(201,162,83,.45)}
.nav-link[aria-current="page"]{color:var(--gold-soft);background:rgba(35,44,99,.88);box-shadow:inset 0 0 0 1px var(--gold)}
.nav-link[aria-current="page"]::after{content:"";position:absolute;left:14px;bottom:8px;width:18px;height:2px;border-radius:2px;background:var(--jade)}
.nav-cta{width:100%;margin-top:10px}

.header-rail{display:none}

/* ---------- footer ---------- */
.site-footer{position:relative;border-top:1px solid var(--line-gold);background:linear-gradient(180deg,#0A0E1C 0%,#080B16 100%)}
.footer-ridge{position:relative;height:62px;overflow:hidden;pointer-events:none}
.footer-ridge::before,.footer-ridge::after{content:"";position:absolute;inset:0}
.footer-ridge::before{background:linear-gradient(180deg,rgba(108,92,231,.34),rgba(11,15,31,0));clip-path:polygon(0 100%,0 74%,9% 46%,18% 70%,27% 36%,36% 66%,46% 28%,56% 62%,67% 34%,77% 68%,88% 44%,100% 66%,100% 100%)}
.footer-ridge::after{background:linear-gradient(180deg,rgba(201,162,83,.42),rgba(11,15,31,0));clip-path:polygon(0 100%,0 86%,12% 62%,23% 84%,34% 56%,45% 80%,57% 52%,68% 78%,80% 58%,91% 82%,100% 70%,100% 100%)}
.footer-inner{max-width:var(--shell);margin-inline:auto;padding:clamp(24px,4vw,50px) clamp(16px,3.4vw,40px) clamp(20px,3vw,34px);display:grid;grid-template-columns:1fr;gap:clamp(22px,3.4vw,42px)}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.brand--footer .brand-name{font-size:19px}
.footer-tagline{font-size:14px;color:var(--muted-dark);letter-spacing:.04em}
.footer-badge{display:inline-flex;align-items:center;gap:8px;padding:5px 12px;border-radius:var(--radius-pill);border:1px solid rgba(201,162,83,.45);font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;color:var(--gold-soft)}
.footer-col{display:flex;flex-direction:column;gap:12px;min-width:0}
.footer-title{font-family:var(--font-display);font-size:14px;font-weight:700;letter-spacing:.12em;color:var(--paper);padding-left:10px;border-left:4px solid var(--gold);line-height:1.4}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-link{display:inline-block;font-size:14.5px;color:#AEB6D2;transition:color .12s var(--ease),transform .12s var(--ease)}
.footer-link:hover{color:var(--jade);transform:translateX(3px)}
.footer-meta{display:flex;flex-direction:column;gap:10px}
.footer-meta li{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px;font-size:13.5px;line-height:1.6}
.footer-key{flex:0 0 auto;padding:1px 8px;border-radius:var(--radius-pill);background:rgba(35,44,99,.8);border:1px solid rgba(201,162,83,.28);font-size:11px;letter-spacing:.08em;color:var(--gold-soft)}
.footer-val{color:#AEB6D2;word-break:break-word}
.footer-legal{max-width:var(--shell);margin-inline:auto;padding:16px clamp(16px,3.4vw,40px) 28px;border-top:1px solid rgba(201,162,83,.16);display:flex;flex-wrap:wrap;gap:8px 22px;align-items:center;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:#7C86A6}
.footer-icp{color:var(--gold-soft)}
.footer-note{margin-left:auto}

/* ---------- responsive ---------- */
@media (max-width:419px){
  .seal{display:none}
  .nav-toggle-text{display:none}
}
@media (min-width:640px){
  .footer-inner{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (min-width:900px){
  body{font-size:17px}
  .footer-inner{grid-template-columns:1.5fr 1fr 1fr 1.4fr;align-items:start}
  .footer-brand{grid-column:auto}
  .footer-legal{font-size:12px}
}
@media (min-width:1160px){
  body{padding-left:var(--rail-w)}
  .header-rail{
    display:flex;position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:50;
    flex-direction:column;align-items:center;justify-content:center;gap:16px;
    background:linear-gradient(180deg,#090D19 0%,#0E1430 46%,#090D19 100%);
    border-right:1px solid rgba(201,162,83,.22);
  }
  .rail-line{width:1px;height:64px;background:linear-gradient(180deg,transparent,rgba(201,162,83,.7),transparent)}
  .rail-text{writing-mode:vertical-rl;font-family:var(--font-mono);font-size:11px;letter-spacing:.42em;color:#8C96B8}
  .rail-ticks{display:flex;flex-direction:column;gap:7px}
  .rail-ticks i{display:block;width:16px;height:1px;background:rgba(201,162,83,.5)}
  .rail-ticks i:nth-child(2n){width:9px;background:rgba(47,211,168,.55)}
  .rail-code{writing-mode:vertical-rl;font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--gold-soft)}
  .nav{position:static;flex-direction:row;align-items:center;gap:6px;margin-left:auto;padding:0;background:none;border:0;box-shadow:none;max-height:none;overflow:visible;opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:row;gap:2px}
  .nav-link{padding:8px 12px;font-size:14.5px;border-radius:var(--radius-pill)}
  .nav-link[aria-current="page"]::after{left:50%;bottom:2px;transform:translateX(-50%)}
  .nav-cta{width:auto;margin-top:0;margin-left:6px;padding:9px 16px;font-size:13.5px}
  .header-meta{margin-left:8px}
  .nav-toggle{display:none}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  [data-reveal]{opacity:1 !important;transform:none !important}
  .footer-link:hover{transform:none}
}