:root{
  --ink:#0A0E14;--surface:#121A24;--surface-2:#18222E;--line:#1F2A37;--line-2:#2A3A4D;
  --text:#E6EDF3;--text-2:#C3CCD6;--muted:#8A97A6;--faint:#7E8D9E;
  --signal:#3DDC97;--signal-dim:#1C3F32;--blueprint:#5AA9FF;--warn:#F4B860;
  --font-display:"Space Grotesk","SF Pro Display",system-ui,sans-serif;
  --font-body:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","SF Mono",ui-monospace,Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ink);color:var(--text);font-family:var(--font-body);min-height:100vh;
  background-image:linear-gradient(rgba(31,42,55,.72) 1px,transparent 1px),linear-gradient(90deg,rgba(31,42,55,.72) 1px,transparent 1px);
  background-size:48px 48px;background-position:-1px -1px}
a{color:inherit}
img{display:block;max-width:100%}
.skip{position:absolute;left:-9999px;top:0;z-index:50;background:var(--signal);color:var(--ink);padding:8px 14px}
.skip:focus{left:0}
.topbar{position:sticky;top:0;z-index:15;display:flex;align-items:center;gap:12px;padding:12px 18px;border-bottom:1px solid var(--line);
  background:rgba(18,26,36,.94);backdrop-filter:blur(10px)}
.brandmark{display:flex;align-items:center;gap:9px;text-decoration:none}
.brandmark .name{font-family:var(--font-display);font-size:14px}
.brandmark b{color:var(--signal)}
.topbar .spacer{flex:1}
.topbar .crumb{font-family:var(--font-mono);font-size:11px;color:var(--faint)}
.top-nav-link{min-height:36px;display:inline-flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:12px;font-weight:700;
  color:var(--text);background:var(--surface-2);border:1px solid var(--text-2);border-radius:8px;padding:0 12px;text-decoration:none}
.top-nav-link:hover{color:var(--signal);border-color:var(--signal)}
.top-nav-link:focus-visible{outline:3px solid var(--blueprint);outline-offset:2px}
.formula{display:flex;gap:10px;align-items:center;padding:8px 18px;border-bottom:1px solid var(--line);background:var(--surface);font-family:var(--font-mono);font-size:12px}
.formula .cell{color:var(--faint)}.formula .fx{color:var(--muted)}.formula .value{color:var(--signal)}
.shell{width:min(1180px,calc(100% - 36px));margin:0 auto;padding:64px 0 110px}
.library-hero{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(280px,.65fr);gap:48px;align-items:end;margin-bottom:60px}
.eyebrow,.content-kicker{font-family:var(--font-mono);font-size:11px;letter-spacing:1.4px;text-transform:uppercase;color:var(--signal);margin:0 0 12px}
h1,h2,h3{font-family:var(--font-display);margin-top:0}
h1{font-size:clamp(42px,7vw,78px);line-height:.98;letter-spacing:-2.2px;margin-bottom:20px}
h1 .accent{color:var(--signal)}
.hero-copy{font-size:clamp(17px,2vw,21px);line-height:1.55;color:var(--text-2);max-width:64ch;margin:0}
.library-index{border:1px solid var(--line-2);border-radius:14px;background:rgba(18,26,36,.92);overflow:hidden}
.library-index a{display:flex;align-items:center;gap:12px;text-decoration:none;padding:15px 17px;border-bottom:1px solid var(--line)}
.library-index a:last-child{border-bottom:0}
.library-index a:hover{background:var(--surface-2)}
.library-index .n{font-family:var(--font-mono);font-size:11px;color:var(--signal)}
.library-index .label{font-family:var(--font-display);font-weight:600}
.library-index .count{margin-left:auto;font-family:var(--font-mono);font-size:10px;color:var(--faint)}
.content-section{scroll-margin-top:92px;margin-top:70px}
.section-head{display:flex;align-items:end;gap:18px;margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid var(--line-2)}
.section-head .number{font-family:var(--font-mono);font-size:12px;color:var(--signal)}
.section-head h2{font-size:clamp(28px,4vw,42px);margin:0}
.section-head p{margin:0 0 3px;color:var(--muted);max-width:58ch;line-height:1.5}
.content-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.content-grid.single{grid-template-columns:minmax(0,620px)}
.learn-card{display:flex;flex-direction:column;text-decoration:none;background:var(--surface);border:1px solid var(--line-2);border-radius:15px;overflow:hidden;transition:transform .15s,border-color .15s}
.learn-card:hover{transform:translateY(-3px);border-color:var(--signal)}
.card-media{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--surface-2);border-bottom:1px solid var(--line)}
.card-media img{width:100%;height:100%;object-fit:cover}
.card-media.portrait img{object-position:50% 28%;filter:saturate(.92) contrast(1.04)}
.card-media.portrait::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,14,20,.74),transparent 56%)}
.play-badge{position:absolute;left:16px;bottom:14px;width:46px;height:46px;display:grid;place-items:center;border-radius:50%;background:var(--signal);color:var(--ink);font-size:17px;padding-left:2px;box-shadow:0 6px 22px rgba(0,0,0,.34)}
.card-copy{padding:18px;display:flex;flex-direction:column;flex:1}
.card-meta{display:flex;justify-content:space-between;gap:12px;font-family:var(--font-mono);font-size:10px;text-transform:uppercase;letter-spacing:.6px;color:var(--blueprint);margin-bottom:10px}
.card-meta span:last-child{color:var(--faint)}
.learn-card h3{font-size:clamp(20px,2.4vw,28px);line-height:1.12;margin-bottom:9px}
.learn-card p{font-size:14px;color:var(--muted);line-height:1.55;margin:0 0 18px}
.card-link{margin-top:auto;font-family:var(--font-mono);font-size:11px;color:var(--signal)}
.detail-shell{width:min(1080px,calc(100% - 36px));margin:0 auto;padding:54px 0 110px}
.back-link{min-height:44px;display:inline-flex;align-items:center;gap:9px;margin-bottom:28px;color:var(--ink);background:var(--signal);
  border-radius:9px;padding:0 14px;font-family:var(--font-display);font-size:13px;font-weight:700;text-decoration:none;
  box-shadow:0 0 0 1px rgba(61,220,151,.42),0 5px 18px rgba(0,0,0,.18)}
.back-link:hover{filter:brightness(1.08)}
.back-link:focus-visible{outline:3px solid var(--blueprint);outline-offset:2px}
.breadcrumb{display:flex;align-items:center;gap:9px;margin-bottom:28px;font-family:var(--font-mono);font-size:11px;color:var(--text-2)}
.breadcrumb a{color:var(--signal);font-weight:600;text-decoration:none}.breadcrumb a:hover{text-decoration:underline}
.detail-hero{display:grid;grid-template-columns:minmax(0,1.04fr) minmax(340px,.96fr);gap:44px;align-items:center}
.detail-hero h1{font-size:clamp(38px,5.6vw,64px)}
.detail-description{font-size:clamp(16px,1.7vw,19px);line-height:1.55;color:var(--text-2);margin:0 0 20px}
.byline{display:flex;flex-wrap:wrap;gap:8px 16px;font-family:var(--font-mono);font-size:10.5px;text-transform:uppercase;color:var(--faint)}
.detail-media{aspect-ratio:16/9;border:1px solid var(--line-2);border-radius:15px;overflow:hidden;background:var(--surface);box-shadow:0 24px 70px rgba(0,0,0,.24)}
.detail-media img{width:100%;height:100%;object-fit:cover}
.detail-media.portrait img{object-position:50% 25%}
.detail-media iframe{width:100%;height:100%;border:0;display:block}
.access-wrap{max-width:720px;margin:48px auto 0}
.gate-card,.access-panel,.article-cta{background:var(--surface);border:1px solid var(--line-2);border-radius:15px;padding:24px}
.gate-card h2,.access-panel h2{font-size:clamp(23px,3vw,34px);margin-bottom:12px}
.gate-card{position:relative;overflow:hidden;background:linear-gradient(145deg,var(--surface),#101D1A)}
.gate-card::before{content:"";position:absolute;width:260px;height:260px;border-radius:50%;background:rgba(61,220,151,.1);right:-100px;top:-130px;filter:blur(8px)}
.gate-card>*{position:relative}
.gate-card p{color:var(--text-2);line-height:1.55;max-width:56ch}
.gate-card .lock-large{font-size:22px;margin-bottom:12px}
.primary-link,.secondary-link{display:inline-flex;align-items:center;gap:9px;text-decoration:none;font-family:var(--font-display);font-size:15px;font-weight:700;border-radius:10px;padding:12px 18px}
.primary-link{background:var(--signal);color:var(--ink)}
.secondary-link{border:1px solid var(--line-2);background:var(--surface);color:var(--text)}
.primary-link:hover{filter:brightness(1.08)}.secondary-link:hover{border-color:var(--signal);color:var(--signal)}
.unlocked{margin-top:24px}
.access-panel p{color:var(--text-2);line-height:1.6;max-width:66ch}
.video-frame{position:relative;aspect-ratio:16/9;border:1px solid var(--line-2);border-radius:15px;overflow:hidden;background:#000}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.after-video{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 0}
.after-video p{margin:0;color:var(--text-2)}
.article{max-width:760px;margin:0 auto;padding:34px 0 20px}
.article p{font-size:17px;line-height:1.78;color:var(--text-2);margin:0 0 22px}
.article ul{margin:0 0 28px;padding-left:24px;color:var(--text-2)}
.article li{font-size:16px;line-height:1.68;margin:0 0 12px;padding-left:5px}
.article strong{color:var(--text)}
.article .article-deck{font-family:var(--font-display);font-size:clamp(22px,3vw,30px);line-height:1.38;color:var(--text);margin-bottom:34px}
.article h2{font-size:clamp(28px,4vw,42px);line-height:1.12;margin:58px 0 18px}
.article h3{font-size:21px;margin:32px 0 8px;color:var(--signal)}
.article em{color:var(--text);font-style:normal;text-decoration:underline;text-decoration-color:var(--signal);text-underline-offset:4px}
.article-cta{margin-top:60px}
.article-cta h2{margin:0 0 12px}
.article-footer-nav{max-width:760px;margin:10px auto 34px;padding-top:26px;border-top:1px solid var(--line)}
.not-found{max-width:720px;margin:80px auto}.not-found p{color:var(--text-2);line-height:1.6}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:820px){
  .shell,.detail-shell{width:min(100% - 28px,720px);padding-top:38px}
  .library-hero,.detail-hero{grid-template-columns:1fr}
  .library-hero{gap:28px}.detail-hero{gap:26px}
  .content-grid{grid-template-columns:1fr}
  .content-grid.single{grid-template-columns:1fr}
  .section-head{align-items:start;flex-wrap:wrap}
}
@media(max-width:560px){
  .topbar .crumb{display:none}
  .formula{font-size:10px}
  h1{letter-spacing:-1.2px}
  .shell{padding-bottom:90px}
  .detail-shell{padding-bottom:90px}
  .card-copy{padding:15px}
  .gate-card,.access-panel,.article-cta{padding:19px}
  .after-video{align-items:flex-start;flex-direction:column}
}