:root{
  --bg:#070c18;--surface:#0f1a2e;--surface2:#0a1122;--surface3:#111f38;
  --border:#1e293b;--border-light:#334155;--text:#f8fafc;--muted:#94a3b8;--dim:#64748b;
  --teal:#6366f1;--teal-dim:rgba(99,102,241,.08);--teal-glow:rgba(99,102,241,.2);
  --green:#34d399;--amber:#f59e0b;--ink:#020617;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:'Geist',sans-serif;font-size:15px;line-height:1.65;overflow-x:hidden;-webkit-font-smoothing:antialiased;min-height:100vh}
body::before{content:'';position:fixed;inset:0;background-image:linear-gradient(rgba(30,42,56,.4) 1px,transparent 1px),linear-gradient(90deg,rgba(30,42,56,.4) 1px,transparent 1px);background-size:48px 48px;pointer-events:none;z-index:0}
a{color:inherit}
@keyframes beacon{0%,100%{opacity:1;box-shadow:0 0 8px var(--teal)}50%{opacity:.45;box-shadow:0 0 3px var(--teal)}}
header{position:sticky;top:0;z-index:50;background:rgba(7,12,24,.78);backdrop-filter:blur(18px);border-bottom:1px solid rgba(30,41,59,.7)}
.nav-inner{width:min(1180px,calc(100vw - 48px));margin:0 auto;height:64px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:20px}
.wordmark{font-weight:800;font-size:16px;line-height:1;letter-spacing:0;color:var(--text);display:flex;align-items:center;gap:10px;text-decoration:none;justify-self:start}
.wordmark-dot,.footer-dot{width:7px;height:7px;border-radius:50%;background:var(--teal);box-shadow:0 0 8px var(--teal);display:inline-block;animation:beacon 2.5s ease-in-out infinite}
.beacon{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,#818cf8,#6366f1);box-shadow:0 0 18px rgba(99,102,241,.32);display:inline-flex;flex-shrink:0}
.nav-links,.nav-actions{display:flex;align-items:center;gap:8px}.nav-links{justify-self:center}.nav-actions{justify-self:end}
.nav-btn{font-family:'Geist Mono',monospace;font-size:12px;color:var(--muted);min-height:36px;padding:0 14px;border-radius:8px;text-decoration:none;display:inline-flex;align-items:center}
.nav-btn:hover,.nav-btn.active{color:var(--text);background:rgba(255,255,255,.04)}
.btn-nav-cta{font-family:'Geist Mono',monospace;font-size:12px;font-weight:800;min-height:34px;padding:0 13px;border-radius:8px;border:1px solid rgba(199,210,254,.22);color:#fff;background:#6466f1;text-decoration:none;display:inline-flex;align-items:center;box-shadow:0 0 0 3px rgba(99,102,241,.14)}
.btn-nav-demo{background:rgba(255,255,255,.03);box-shadow:none;color:var(--muted)}
.learn-shell,.article-shell{position:relative;z-index:1;width:min(1120px,calc(100vw - 48px));margin:0 auto}
.article-shell{width:min(920px,calc(100vw - 48px))}
.eyebrow{font-family:'Geist Mono',monospace;font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--teal);display:flex;align-items:center;gap:12px;margin-bottom:22px}
.eyebrow::before{content:'';display:block;width:28px;height:1px;background:var(--teal)}
.section-tag{font-family:'Geist Mono',monospace;font-size:10px;color:var(--teal);letter-spacing:2px;text-transform:uppercase;margin-bottom:12px}
.learn-hero{padding:104px 0 42px;border-bottom:1px solid var(--border)}
.learn-hero h1,.article-hero h1{font-size:clamp(46px,8vw,104px);line-height:.92;font-weight:900;letter-spacing:0;max-width:980px;margin-bottom:24px}
.learn-hero p{font-size:18px;line-height:1.7;color:var(--muted);max-width:760px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.btn-primary,.btn-ghost{font-family:'Geist Mono',monospace;font-size:13px;border-radius:8px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 22px;text-align:center;white-space:normal}
.btn-primary{background:var(--teal);color:#fff}.btn-primary:hover{box-shadow:0 0 32px var(--teal-glow)}
.btn-ghost{border:1px solid var(--border);color:var(--muted);background:transparent}.btn-ghost:hover{border-color:var(--border-light);color:var(--text)}
.guide-directory{padding:34px 0 28px;border-bottom:1px solid var(--border)}
.directory-head{display:grid;grid-template-columns:1fr 420px;gap:28px;align-items:end;margin-bottom:18px}
.directory-head h2{font-size:34px;line-height:1.08}.directory-head p{color:var(--muted)}
.directory-list{border:1px solid var(--border);border-radius:12px;background:var(--surface);overflow:hidden}
.directory-row{display:grid;grid-template-columns:52px 170px 1fr 1.15fr 116px;gap:16px;align-items:center;padding:18px 20px;border-bottom:1px solid var(--border);text-decoration:none;transition:background .2s,border-color .2s}
.directory-row:last-child{border-bottom:none}.directory-row:hover{background:var(--surface2)}
.directory-num,.directory-label,.directory-row em{font-family:'Geist Mono',monospace;font-size:11px;font-style:normal}
.directory-num{color:var(--green)}.directory-label{color:var(--dim);text-transform:uppercase;letter-spacing:1.2px}.directory-row strong{font-size:17px;line-height:1.2}.directory-row small{color:var(--muted);line-height:1.5}.directory-row em{color:var(--teal);text-align:right}
.learn-compact{padding:78px 0 34px;border-bottom:1px solid var(--border)}
.learn-compact h1{font-size:clamp(42px,7vw,76px);line-height:.95;font-weight:900;letter-spacing:0;margin-bottom:18px}
.learn-compact p{font-size:17px;line-height:1.7;color:var(--muted);max-width:760px}
.learn-index-layout{display:grid;grid-template-columns:210px 1fr;gap:44px;align-items:start}
.learn-side-nav{position:sticky;top:86px;display:flex;flex-direction:column;gap:6px;padding:42px 0}
.learn-side-nav a{font-family:'Geist Mono',monospace;font-size:11px;color:var(--muted);text-decoration:none;border:1px solid transparent;border-radius:8px;padding:9px 10px}
.learn-side-nav a:hover{color:var(--text);background:rgba(255,255,255,.035);border-color:var(--border)}
.learn-index-main{min-width:0}
.index-section{padding:42px 0;border-bottom:1px solid var(--border);scroll-margin-top:84px}
.index-head{display:grid;grid-template-columns:1fr 360px;gap:28px;align-items:end;margin-bottom:18px}
.index-head h2{font-size:32px;line-height:1.1}.index-head p{color:var(--muted)}
.start-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.start-card{border:1px solid var(--border);background:var(--surface);border-radius:10px;padding:20px;text-decoration:none;display:flex;flex-direction:column;gap:12px;min-height:178px;transition:background .2s,border-color .2s,transform .2s}
.start-card:hover{background:var(--surface2);border-color:var(--border-light);transform:translateY(-1px)}
.start-card strong{font-size:22px;line-height:1.15}.start-card span{color:var(--muted);line-height:1.6}.start-card em{margin-top:auto;font-family:'Geist Mono',monospace;font-size:11px;font-style:normal;color:var(--teal)}
.link-list,.module-list{border:1px solid var(--border);border-radius:12px;background:var(--surface);overflow:hidden}
.index-link,.module-row{display:grid;grid-template-columns:230px 1fr 102px;gap:18px;align-items:center;padding:18px 20px;border-bottom:1px solid var(--border);text-decoration:none;transition:background .2s}
.module-row{grid-template-columns:190px 1fr 118px}
.index-link:last-child,.module-row:last-child{border-bottom:none}.index-link:hover,.module-row:hover{background:var(--surface2)}
.index-link strong,.module-row strong{font-size:17px;line-height:1.2}.index-link span,.module-row span{color:var(--muted);line-height:1.55}.index-link em,.module-row em{font-family:'Geist Mono',monospace;font-style:normal;font-size:11px;color:var(--teal);text-align:right}
.proof-section{background:rgba(99,102,241,.045);border:1px solid rgba(99,102,241,.18);border-radius:14px;padding:30px;margin:42px 0}
.proof-section p{color:#cbd5e1;font-size:16px;line-height:1.7;max-width:780px;margin:12px 0 22px}
.proof-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.proof-grid div{border:1px solid var(--border);background:rgba(2,6,23,.24);border-radius:10px;padding:16px}.proof-grid strong{display:block;margin-bottom:8px}.proof-grid span{color:var(--muted);line-height:1.55}
.loop-band{margin:42px 0 0;border:1px solid var(--border);background:var(--surface);border-radius:12px;padding:24px;display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:center}
.loop-band h2{font-size:30px;line-height:1.1;margin-bottom:12px}.loop-band p{color:var(--muted)}
.loop-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.loop-grid span{font-family:'Geist Mono',monospace;font-size:12px;color:var(--green);border:1px solid var(--border);background:rgba(255,255,255,.025);border-radius:8px;padding:14px}
.learn-cluster{padding:74px 0;border-bottom:1px solid var(--border)}
.cluster-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:24px}
.cluster-head h2{font-size:36px;line-height:1.08}.cluster-head p{color:var(--muted);max-width:520px}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.learn-card,.related-card{border:1px solid var(--border);background:var(--surface);border-radius:10px;padding:22px;min-height:210px;text-decoration:none;display:flex;flex-direction:column;gap:12px;transition:all .2s}
.learn-card:hover,.related-card:hover{border-color:var(--border-light);background:var(--surface2);transform:translateY(-1px)}
.learn-card span,.related-card span{font-family:'Geist Mono',monospace;font-size:9px;letter-spacing:1.8px;text-transform:uppercase;color:var(--dim)}
.learn-card strong,.related-card strong{font-size:20px;line-height:1.18}.learn-card p,.related-card small{color:var(--muted);line-height:1.6}.learn-card em{margin-top:auto;font-family:'Geist Mono',monospace;font-size:11px;font-style:normal;color:var(--teal)}
.path-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.path-card{border:1px solid var(--border);background:var(--surface);border-radius:10px;padding:18px}
.path-card h3{font-size:16px;margin-bottom:12px}.path-card ol{list-style:none;counter-reset:path;display:flex;flex-direction:column;gap:8px}
.path-card li{counter-increment:path;font-size:12px;color:var(--muted);padding-left:24px;position:relative}.path-card li::before{content:counter(path);position:absolute;left:0;color:var(--teal);font-family:'Geist Mono',monospace}
.action-table{border:1px solid var(--border);border-radius:10px;overflow:hidden;background:var(--surface)}
.action-table div{display:grid;grid-template-columns:190px 1fr 160px;gap:16px;padding:16px 18px;border-bottom:1px solid var(--border);align-items:center}
.action-table div:last-child{border-bottom:none}.action-table strong{font-family:'Geist Mono',monospace;font-size:12px}.action-table span{color:var(--muted)}.action-table small{font-family:'Geist Mono',monospace;font-size:10px;color:var(--dim);text-transform:uppercase;letter-spacing:1px}
.back-link{display:inline-flex;margin-top:88px;color:var(--muted);font-family:'Geist Mono',monospace;font-size:12px;text-decoration:none}.back-link:hover{color:var(--text)}
.article-hero{padding:34px 0 48px;border-bottom:1px solid var(--border)}
.article-hero h1{font-size:clamp(42px,7vw,82px);max-width:850px}.answer{font-size:21px;line-height:1.6;color:#cbd5e1;max-width:780px}
.article-section{padding:54px 0;border-bottom:1px solid var(--border)}.article-section h2{font-size:30px;line-height:1.15;margin-bottom:18px;max-width:720px}.article-section p{color:var(--muted);font-size:16px;line-height:1.75;margin:14px 0}
.split{display:grid;grid-template-columns:.9fr 1.1fr;gap:44px}.check-list,.mistake-list{display:flex;flex-direction:column;gap:12px;list-style:none}.check-list li,.mistake-list li{position:relative;color:var(--muted);padding-left:24px}.check-list li::before{content:'+';position:absolute;left:0;color:var(--green);font-family:'Geist Mono',monospace}.mistake-list li::before{content:'-';position:absolute;left:0;color:var(--amber);font-family:'Geist Mono',monospace}
.model-box{background:rgba(99,102,241,.055);border:1px solid rgba(99,102,241,.2);border-radius:12px;padding:34px;margin:54px 0}
.teaching-box{background:linear-gradient(135deg,rgba(52,211,153,.045),rgba(99,102,241,.04));border:1px solid rgba(52,211,153,.18);border-radius:12px;padding:34px;margin:54px 0}.teaching-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:22px 0}.teaching-row{border:1px solid var(--border);background:rgba(2,6,23,.26);border-radius:10px;padding:16px}.teaching-label{font-family:'Geist Mono',monospace;font-size:10px;letter-spacing:1.4px;text-transform:uppercase;color:var(--green);margin-bottom:8px}.teaching-body{color:var(--muted);font-size:14px;line-height:1.6}.teaching-takeaway{border-left:2px solid var(--green);padding:10px 0 10px 16px;color:#cbd5e1;font-size:15px;line-height:1.65}
.steps{--flow-gap:34px;position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:42px var(--flow-gap);border:1px solid var(--border);border-radius:14px;overflow:hidden;background:radial-gradient(circle,rgba(99,102,241,.2) 1px,transparent 1px) 0 0/24px 24px,linear-gradient(180deg,rgba(15,26,46,.94),rgba(9,15,29,.96));margin-top:22px;padding:32px}.steps:before{content:"";position:absolute;left:32px;right:32px;top:70px;height:2px;background:linear-gradient(90deg,rgba(52,211,153,.08),rgba(52,211,153,.55),rgba(99,102,241,.5),rgba(52,211,153,.08));box-shadow:0 0 20px rgba(52,211,153,.16)}.step{position:relative;z-index:1;display:flex;flex-direction:column;min-height:190px;padding:18px;border:1px solid rgba(52,211,153,.24);border-radius:12px;background:linear-gradient(180deg,rgba(15,26,46,.96),rgba(12,21,38,.96));box-shadow:0 18px 36px rgba(2,6,23,.24)}.step:nth-child(1){grid-column:1;grid-row:1}.step:nth-child(2){grid-column:2;grid-row:1}.step:nth-child(3){grid-column:3;grid-row:1}.step:nth-child(4){grid-column:3;grid-row:2}.step:nth-child(5){grid-column:2;grid-row:2}.step:nth-child(6){grid-column:1;grid-row:2}.step:before{content:"";position:absolute;top:35px;left:-7px;width:12px;height:12px;border-radius:999px;background:var(--green);box-shadow:0 0 0 5px rgba(52,211,153,.12),0 0 18px rgba(52,211,153,.45)}.step:nth-child(n+4):before{left:auto;right:-7px}.step:after{content:"";position:absolute;top:40px;left:calc(100% + 1px);width:var(--flow-gap);height:2px;background:linear-gradient(90deg,var(--green),var(--teal));box-shadow:0 0 14px rgba(52,211,153,.34);animation:flow-wire 2.8s ease-in-out infinite}.step:nth-child(3):after{top:calc(100% + 1px);left:50%;width:2px;height:42px;background:linear-gradient(180deg,var(--green),var(--teal));transform-origin:top}.step:nth-child(4):after,.step:nth-child(5):after{left:auto;right:calc(100% + 1px);background:linear-gradient(270deg,var(--green),var(--teal));transform-origin:right}.step:last-child:after{display:none}.step-meta{display:flex;align-items:center;gap:8px;margin-bottom:18px;font-family:'Geist Mono',monospace;font-size:11px;color:var(--dim);text-transform:uppercase;letter-spacing:.08em}.step-num{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:999px;background:rgba(148,163,184,.12);color:var(--text);letter-spacing:0}.step-label{color:var(--dim)}.step h3{font-size:17px;line-height:1.2;margin-bottom:10px}.step p{margin:0;color:var(--muted);font-size:14px;line-height:1.6}@keyframes flow-wire{0%,100%{opacity:.38;transform:scale(.72,1)}50%{opacity:1;transform:scale(1,1)}}
.faq details{border:1px solid var(--border);background:var(--surface);border-radius:10px;margin:10px 0;padding:0 18px}.faq summary{cursor:pointer;padding:18px 0;font-weight:700}.faq details p{padding:0 0 18px;margin:0}
.related{padding:54px 0;border-bottom:1px solid var(--border)}.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.related-card{min-height:160px}
.article-cta{margin:60px 0 88px;padding:44px;border:1px solid var(--border);border-radius:14px;background:var(--surface);display:flex;justify-content:space-between;gap:34px;align-items:center}.article-cta h2{font-size:30px;line-height:1.1;margin-bottom:10px}.article-cta p{color:var(--muted);max-width:650px}
footer{position:relative;z-index:1;border-top:1px solid var(--border);padding:32px 0}.footer-inner{width:min(1180px,calc(100vw - 48px));margin:0 auto;display:flex;justify-content:space-between;gap:24px;color:var(--dim);font-family:'Geist Mono',monospace;font-size:11px}.footer-left,.footer-brand,.footer-links{display:flex;align-items:center;gap:12px}.footer-brand,.footer-links a{text-decoration:none;color:var(--dim)}.footer-links a:hover,.footer-brand:hover{color:var(--text)}.footer-sep{width:1px;height:14px;background:var(--border)}
@media(max-width:900px){.nav-inner{grid-template-columns:1fr;gap:10px;height:auto;padding:14px 0}.nav-links,.nav-actions,.wordmark{justify-self:start}.nav-actions{display:none}.learn-index-layout,.loop-band,.split,.teaching-grid,.directory-head,.index-head{grid-template-columns:1fr}.learn-side-nav{position:static;display:grid;grid-template-columns:repeat(2,1fr);padding:22px 0 0}.directory-row{grid-template-columns:38px 1fr;gap:8px}.directory-row strong,.directory-row small,.directory-row em{grid-column:2}.directory-row em{text-align:left}.start-grid,.proof-grid,.card-grid,.path-grid,.related-grid{grid-template-columns:1fr}.index-link,.module-row{grid-template-columns:1fr;gap:8px}.index-link em,.module-row em{text-align:left}.cluster-head{display:block}.cluster-head p{margin-top:12px}.action-table div{grid-template-columns:1fr}.article-cta{display:block}.article-cta .btn-primary{margin-top:22px}.footer-inner{display:block}.footer-right{margin-top:14px}}
@media(max-width:600px){.learn-shell,.article-shell,.nav-inner,.footer-inner{width:min(100vw - 28px,1120px)}.nav-btn{font-size:11px;min-height:32px;padding:0 9px}.learn-hero{padding-top:76px}.learn-compact{padding-top:62px}.learn-compact h1,.learn-hero h1,.article-hero h1{font-size:42px}.learn-side-nav{grid-template-columns:1fr}.article-section h2,.cluster-head h2,.index-head h2{font-size:28px}.steps{grid-template-columns:1fr;gap:26px;padding:24px}.steps:before{display:none}.step,.step:nth-child(n){grid-column:auto;grid-row:auto;min-height:0;padding:16px}.step:before,.step:nth-child(n+4):before{left:20px;right:auto;top:-7px}.step:first-child:before{top:31px}.step:after,.step:nth-child(3):after,.step:nth-child(4):after,.step:nth-child(5):after{left:26px;right:auto;top:calc(100% + 1px);width:2px;height:26px;background:linear-gradient(180deg,var(--green),var(--teal));transform-origin:top}.step:last-child:after{display:none}.model-box,.teaching-box,.article-cta,.proof-section{padding:24px}.hero-actions .btn-primary,.hero-actions .btn-ghost,.article-cta .btn-primary{width:100%}}