:root{--k:#0b0b0b;--k2:#121212;--k3:#171717;--line:#242424;--a:#f2b233;--w:#ffffff;--g:#b9b9b9;--g2:#8a8a8a;--ok:#4ade80}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--k);color:var(--w);font-family:Inter,system-ui,-apple-system,sans-serif;-webkit-font-smoothing:antialiased;line-height:1.6}
a{color:inherit}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.kick{font-family:Graduate,serif;color:var(--a);letter-spacing:.18em;font-size:14px;text-transform:uppercase}
.btn{display:inline-block;background:var(--a);color:#111;font-weight:800;text-decoration:none;border:0;border-radius:12px;padding:15px 24px;font-size:16px;font-family:inherit;cursor:pointer;transition:transform .15s ease,background .15s ease}
.btn:hover{background:#ffc24d;transform:translateY(-1px)}
.btn:focus-visible,button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #fff;outline-offset:3px}
.btn[disabled]{opacity:.6;cursor:default;transform:none}

nav{border-bottom:1px solid #1c1c1c}
nav .wrap{display:flex;align-items:center;gap:12px;height:68px}
nav .home{display:flex;align-items:center;gap:12px;text-decoration:none}
nav .name{font-family:Graduate,serif;color:var(--a);letter-spacing:.12em;font-size:17px;white-space:nowrap}
nav .where{margin-left:auto;color:var(--g);font-size:14px;white-space:nowrap}

.lesson{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;padding-top:40px;padding-bottom:72px;align-items:start}
.lesson h1{font-size:clamp(32px,4.6vw,52px);font-weight:900;letter-spacing:-.025em;line-height:1.05;margin:14px 0 26px}

.video{position:relative;aspect-ratio:16/9;border-radius:16px;overflow:hidden;background:#000;border:1px solid var(--line)}
.video iframe,.video .play,.video img{position:absolute;inset:0;width:100%;height:100%;border:0}
.video .play{cursor:pointer;background:none;padding:0}
.video img{object-fit:cover}
.video .tri{position:absolute;right:20px;bottom:20px;width:76px;height:76px;border-radius:50%;background:var(--a);box-shadow:0 10px 40px rgba(0,0,0,.5);transition:transform .15s ease}
.video .tri:after{content:"";position:absolute;left:30px;top:22px;border-style:solid;border-width:16px 0 16px 26px;border-color:transparent transparent transparent #111}
.video .play:hover .tri{transform:scale(1.06)}

.body{margin-top:34px;font-size:17px;color:#e6e6e6}
.body p{margin:0 0 16px}
.body .build{font-size:19px;color:var(--w);background:var(--k2);border:1px solid var(--line);border-left:4px solid var(--a);border-radius:12px;padding:18px 20px}
.body .build strong{color:var(--a)}
.body h2{font-size:24px;font-weight:800;letter-spacing:-.01em;margin:38px 0 14px}
.body ul,.body ol{margin:0 0 18px 22px}
.body li{margin:0 0 8px;padding-left:4px}
.body strong{color:var(--w)}
.prompt,.sheet{position:relative;background:var(--k2);border:1px solid var(--line);border-radius:14px;margin:0 0 22px}
.prompt pre{white-space:pre-wrap;word-break:break-word;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:15px;line-height:1.6;color:#f1f1f1;padding:22px 22px 70px}
.sheet ul,.sheet ol{margin:0;padding:22px 22px 70px 44px}
.copy{position:absolute;right:14px;bottom:14px;background:var(--a);color:#111;font-weight:800;font-family:inherit;font-size:14px;border:0;border-radius:10px;padding:10px 16px;cursor:pointer}
.copy:hover{background:#ffc24d}
.copy.ok{background:var(--ok)}

.done{margin-top:10px;width:100%;background:transparent;color:var(--w);border:2px solid var(--line);border-radius:12px;padding:15px;font-family:inherit;font-size:16px;font-weight:700;cursor:pointer}
.done:hover{border-color:var(--a)}
.done.is-done{border-color:var(--ok);color:var(--ok)}

.pns{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.pn{display:block;background:var(--k2);border:1px solid var(--line);border-radius:12px;padding:16px 18px;text-decoration:none;font-weight:700;font-size:15px;line-height:1.35}
.pn:hover{border-color:var(--a)}
.pn small{display:block;color:var(--g2);font-weight:500;font-size:13px;margin-bottom:4px}
.pn.next{text-align:right}

.signup{margin-top:44px;background:linear-gradient(160deg,#1a1508,#121212 60%);border:1px solid #3a2d10;border-radius:18px;padding:30px}
.signup h2{font-size:26px;font-weight:900;letter-spacing:-.015em;line-height:1.15;margin-bottom:8px}
.signup p{color:var(--g)}
.join{display:flex;gap:10px;margin-top:18px}
.join input[type=email]{flex:1;min-width:0;background:#0b0b0b;border:1px solid #333;border-radius:12px;color:var(--w);font-family:inherit;font-size:16px;padding:15px 16px}
.join input[type=email]::placeholder{color:#666}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.msg{margin-top:12px;font-weight:600;min-height:0}
.msg.ok{color:var(--ok)}
.msg.err{color:#ff8a8a}
.fine{font-size:13px;color:var(--g2)!important;margin-top:10px}

.toc{position:sticky;top:24px;background:var(--k2);border:1px solid var(--line);border-radius:16px;padding:22px}
.toc ol{list-style:none;margin-top:14px}
.toc li a{display:flex;gap:12px;align-items:flex-start;padding:10px 8px;border-radius:10px;text-decoration:none;color:var(--g);font-size:15px;line-height:1.35}
.toc li a:hover{background:var(--k3);color:var(--w)}
.toc li.on a{background:var(--k3);color:var(--w);font-weight:700}
.toc .num{flex:none;width:26px;height:26px;border-radius:50%;border:2px solid var(--a);color:var(--a);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800}
.toc li.is-done .num{background:var(--ok);border-color:var(--ok);color:#111}

footer{border-top:1px solid #161616;padding:30px 0;color:var(--g2);font-size:14px}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

@media (max-width:900px){
  .lesson{grid-template-columns:1fr;gap:32px;padding-top:26px}
  .toc{position:static}
}
@media (max-width:560px){
  .wrap{padding:0 16px}
  nav .name{font-size:14px}
  nav .home img{width:34px;height:34px}
  .body{font-size:16px}
  .video .tri{width:54px;height:54px;right:12px;bottom:12px}
  .video .tri:after{left:21px;top:15px;border-width:12px 0 12px 19px}
  .pns{grid-template-columns:1fr}
  .pn.next{text-align:left}
  .join{flex-direction:column}
  .join .btn{width:100%}
  .signup{padding:24px 20px}
}