:root{
  --bg:#06080c; --panel:#0c1016; --line:#19222f; --line2:#243244;
  --text:#eef2f8; --muted:#90a0b3; --faint:#5a6675;
  --cyan:#00e5ff; --green:#5dff8f; --accent:#7c93ff; --pink:#ff5acd; --amber:#ffd166;
  --track:#00e5ff; --track-rgb:0,229,255;
  --glass:linear-gradient(180deg,rgba(22,29,40,.64),rgba(9,12,17,.58));
  --shadow:0 22px 58px rgba(0,0,0,.34), inset 0 1px 0 rgba(255,255,255,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
html,body{margin:0;padding:0}
body{
  min-height:100vh;color:var(--text);
  font-family:'Inter',ui-sans-serif,system-ui,-apple-system,sans-serif;
  font-feature-settings:"cv02","cv03","cv04","ss01";
  letter-spacing:-.01em;-webkit-font-smoothing:antialiased;overflow-x:hidden;
  background:
    radial-gradient(840px 540px at 8% -8%, rgba(var(--track-rgb),.16), transparent 60%),
    radial-gradient(760px 520px at 94% 0%, rgba(255,90,205,.09), transparent 58%),
    radial-gradient(980px 700px at 50% 118%, rgba(124,147,255,.08), transparent 62%),
    var(--bg);
  background-attachment:fixed;
}
a{color:inherit}
svg{display:block}
.mono,code{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace}
:focus-visible{outline:2px solid var(--track);outline-offset:3px;border-radius:7px}
#bgfx{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:0;transition:opacity 1s ease}
#bgfx.on{opacity:1}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(124,147,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(124,147,255,.045) 1px,transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(1000px 640px at 50% -3%,#000 26%,transparent 76%);
  -webkit-mask-image:radial-gradient(1000px 640px at 50% -3%,#000 26%,transparent 76%);
}
header,main,footer{position:relative;z-index:1}
.wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}
.nav{position:sticky;top:0;z-index:40;border-bottom:1px solid var(--line);background:rgba(6,8,12,.66);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;padding:13px 0;gap:18px}
.logo{display:flex;align-items:center;gap:11px;text-decoration:none;font-weight:750;font-size:16.5px;letter-spacing:-.35px}
.mark{width:30px;height:30px;border-radius:10px;display:grid;place-items:center;color:var(--track);border:1px solid rgba(var(--track-rgb),.30);background:linear-gradient(140deg,rgba(var(--track-rgb),.16),rgba(124,147,255,.14));box-shadow:inset 2px 2px 6px rgba(0,0,0,.38),inset -2px -2px 6px rgba(255,255,255,.04)}
.mark svg{width:16px;height:16px}
.links{display:flex;align-items:center;gap:6px}
.links a{color:var(--muted);text-decoration:none;font-size:13.5px;font-weight:600;padding:7px 12px;border-radius:11px;transition:.18s}
.links a:hover{color:var(--text);background:rgba(var(--track-rgb),.09)}
.hero{padding:74px 0 30px;display:grid;grid-template-columns:minmax(0,1fr) minmax(320px,430px);gap:28px;align-items:center}
.heroCopy{display:grid;gap:20px;justify-items:start}
.eyebrow{display:inline-flex;align-items:center;gap:9px;color:var(--track);font-size:11.5px;letter-spacing:2px;text-transform:uppercase;font-weight:800;font-family:'JetBrains Mono',monospace;border:1px solid rgba(var(--track-rgb),.28);background:rgba(var(--track-rgb),.08);padding:7px 15px;border-radius:30px;box-shadow:var(--shadow)}
.pulse{width:7px;height:7px;border-radius:50%;background:var(--track);box-shadow:0 0 10px var(--track);animation:blink 1.7s ease-in-out infinite}
@keyframes blink{50%{opacity:.25}}
h1{margin:0;font-size:clamp(42px,7.2vw,82px);line-height:1;letter-spacing:-.035em;font-weight:760;color:#fff;text-wrap:balance}
h1 b{color:var(--track)}
.sub{margin:0;color:var(--muted);line-height:1.68;max-width:720px;font-size:17px}
.sub b{color:var(--text);font-weight:650}
.cta{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;gap:9px;text-decoration:none;font-weight:700;font-size:14px;padding:13px 22px;border-radius:14px;border:1px solid transparent;transition:.22s}
.btn svg{width:16px;height:16px;transition:.22s}
.btn.primary{color:#04121a;background:linear-gradient(135deg,var(--track),#dff9ff);box-shadow:0 18px 34px rgba(0,0,0,.32),inset 0 1px 0 rgba(255,255,255,.24)}
.btn.ghost{color:var(--text);border-color:var(--line2);background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow)}
.btn:hover{transform:translateY(-3px)}
.btn:hover svg{transform:translateX(4px)}
.visual{position:relative;min-height:380px;border:1px solid rgba(var(--track-rgb),.18);border-radius:22px;background:var(--glass);backdrop-filter:blur(14px) saturate(135%);-webkit-backdrop-filter:blur(14px) saturate(135%);box-shadow:var(--shadow);overflow:hidden}
.visual svg{position:absolute;inset:0;width:100%;height:100%}
.stroke{fill:none;stroke:rgb(var(--track-rgb));stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.soft{fill:rgba(var(--track-rgb),.11);stroke:rgba(var(--track-rgb),.42);stroke-width:1.5}
.label{fill:#eef2f8;font:700 12px 'Inter',sans-serif;text-anchor:middle}
.small{fill:#90a0b3;font:700 9px 'JetBrains Mono',monospace;text-anchor:middle;letter-spacing:.8px}
.float{animation:floatNode 4s ease-in-out infinite}.float:nth-child(2n){animation-delay:-1.1s}
@keyframes floatNode{50%{transform:translateY(-6px)}}
.sectionhead{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin:46px 0 18px;flex-wrap:wrap}
.sectionhead h2{margin:0;font-size:24px;letter-spacing:-.5px}
.sectionhead p{margin:6px 0 0;color:var(--muted);font-size:14px;line-height:1.55;max-width:680px}
.note{font-size:12px;color:var(--faint);font-family:'JetBrains Mono',monospace}.note b{color:var(--track)}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.card{--a:var(--track-rgb);position:relative;min-height:122px;text-decoration:none;color:inherit;border:1px solid rgba(var(--a),.17);border-radius:16px;background:linear-gradient(180deg,rgba(var(--a),.055),rgba(10,13,18,.70));box-shadow:var(--shadow);padding:15px;display:flex;flex-direction:column;gap:9px;overflow:hidden;transition:.2s}
.card::before{content:"";position:absolute;inset:0;background:rgba(4,7,12,.24);pointer-events:none}
.card>*{position:relative}
.card:hover{transform:translateY(-3px);border-color:rgba(var(--a),.46)}
.card b{font-size:14px;letter-spacing:-.2px}.card span{color:var(--muted);font-size:12px;line-height:1.45}
.card .tag{margin-top:auto;font-family:'JetBrains Mono',monospace;font-size:10px;color:rgb(var(--a));font-weight:800}
.flowBand{display:grid;grid-template-columns:1.2fr .8fr;gap:14px;margin:0 0 18px}
.flowPanel,.lesson,.pathCard,.stackCard{border:1px solid rgba(var(--track-rgb),.18);border-radius:18px;background:var(--glass);box-shadow:var(--shadow);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);padding:20px}
.flowPanel h3,.lesson h3,.pathCard h3,.stackCard h3{margin:0 0 8px;font-size:18px;letter-spacing:-.3px}
.flowPanel p,.lesson p,.pathCard p,.stackCard p{margin:0;color:var(--muted);line-height:1.6;font-size:13.5px}
.flowSvg{margin-top:16px;border:1px solid rgba(var(--track-rgb),.14);border-radius:14px;background:rgba(5,8,12,.45);overflow:hidden}
.flowSvg svg{width:100%;height:auto}
.routeList{display:grid;gap:10px}
.routeItem{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid rgba(var(--track-rgb),.15);border-radius:12px;background:rgba(7,10,15,.45)}
.routeItem b{font-size:13px}.routeItem span{font-size:12px;color:var(--muted)}
.dot{width:9px;height:9px;border-radius:50%;background:var(--track);box-shadow:0 0 12px var(--track)}
.pathGrid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.pathCard{min-height:210px;display:flex;flex-direction:column;gap:14px}
.pathTop{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.pathPill{font-family:'JetBrains Mono',monospace;font-size:10px;color:var(--track);font-weight:800;border:1px solid rgba(var(--track-rgb),.26);border-radius:999px;padding:5px 9px;background:rgba(var(--track-rgb),.08)}
.stackGrid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:14px 0}
.stackCard{min-height:132px;padding:16px}
.stackCard .mono{color:var(--track);font-size:11px;font-weight:800}
.lesson{margin-top:14px}
.lessonHeader{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:16px}
.lessonHeader h2{margin:0;font-size:26px;letter-spacing:-.6px}
.lessonHeader p{margin:8px 0 0;color:var(--muted);line-height:1.6}
.lessonGrid{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,.72fr);gap:14px}
.lessonSection{border:1px solid rgba(var(--track-rgb),.14);border-radius:14px;background:rgba(6,9,14,.56);padding:16px;margin-bottom:12px}
.lessonSection h3{font-size:15px;margin:0 0 8px;color:var(--text)}
.lessonSection ol,.lessonSection ul{margin:8px 0 0;padding-left:20px;color:var(--muted);line-height:1.7;font-size:13px}
.diagram{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;white-space:pre;overflow:auto;margin:0;background:#05080d;border:1px solid rgba(var(--track-rgb),.16);border-radius:12px;padding:14px;color:#dce8f8;font-size:12px;line-height:1.55}
.codeBlock{margin:10px 0 0;background:#05080d;border:1px solid rgba(var(--track-rgb),.16);border-radius:12px;padding:14px;overflow:auto;color:#e6edf3;font:12px/1.65 'JetBrains Mono',ui-monospace,Menlo,monospace}
.explainTable{width:100%;border-collapse:collapse;margin-top:10px;font-size:12.5px;color:var(--muted)}
.explainTable th,.explainTable td{border-bottom:1px solid rgba(var(--track-rgb),.12);padding:9px;text-align:left;vertical-align:top}
.explainTable th{color:var(--text)}
.assignment{border-color:rgba(93,255,143,.25);background:rgba(93,255,143,.06)}
.mistake{border-color:rgba(255,90,90,.22);background:rgba(255,90,90,.045)}
.lessonSide{position:sticky;top:86px;align-self:start}
.projectCard{border:1px solid rgba(255,209,102,.24);background:rgba(255,209,102,.06);border-radius:14px;padding:16px}
.projectCard b{color:#ffd166}
.projectSteps{display:grid;gap:9px;margin-top:12px}
.projectSteps span{font-size:12.5px;color:var(--muted);border:1px solid rgba(255,209,102,.14);border-radius:10px;padding:9px;background:rgba(5,8,12,.36)}
.flowDot{animation:pulseDot 1.8s ease-in-out infinite}
@keyframes pulseDot{50%{opacity:.35;transform:scale(.92)}}
.preview{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.preview .card{min-height:180px}
.soonBox{border:1px solid rgba(var(--track-rgb),.18);border-radius:20px;background:var(--glass);box-shadow:var(--shadow);padding:24px;display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,390px);gap:24px;align-items:center}
.soonBox h2{margin:0 0 10px;font-size:28px;letter-spacing:-.7px}
.soonBox p{margin:0;color:var(--muted);line-height:1.65}
.miniArt{min-height:220px;position:relative;border:1px solid rgba(var(--track-rgb),.16);border-radius:16px;background:rgba(8,11,16,.42);overflow:hidden}
.miniArt svg{position:absolute;inset:0;width:100%;height:100%}
footer{border-top:1px solid var(--line);margin-top:64px}
footer .wrap{padding:24px 0 44px;color:var(--faint);font-size:12.5px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
footer a{color:var(--muted);text-decoration:none}footer a:hover{color:var(--text)}
@media(max-width:980px){
  .hero,.soonBox{grid-template-columns:1fr}
  .visual{min-height:330px}
  .grid{grid-template-columns:repeat(2,1fr)}
  .preview{grid-template-columns:1fr}
  .flowBand,.pathGrid,.lessonGrid{grid-template-columns:1fr}
  .stackGrid{grid-template-columns:repeat(2,1fr)}
  .lessonSide{position:static}
}
@media(max-width:620px){
  .wrap{width:min(100% - 30px,1160px)}
  .links a:not(:first-child){display:none}
  .hero{padding:52px 0 22px}
  .grid{grid-template-columns:1fr}
  .stackGrid{grid-template-columns:1fr}
  .btn{width:100%;justify-content:center}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  #bgfx{display:none}
}