:root{--bg:#060913;--panel:#0d1426;--panel2:#101b32;--text:#edf5ff;--muted:#9eb0c9;--cyan:#35e7ff;--violet:#9c6cff;--green:#63ffb0;--line:#263654;--warn:#ffca5c}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 15% 0,#14264a 0,#060913 38%);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.62}a{color:var(--cyan);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:1180px;margin:auto;padding:28px 22px}.nav{display:flex;gap:18px;flex-wrap:wrap;align-items:center;border-bottom:1px solid var(--line);padding-bottom:18px}.brand{font-weight:900;letter-spacing:.12em;color:white}.hero{padding:72px 0 42px}.eyebrow{color:var(--green);font-size:.78rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.hero h1{font-size:clamp(2.5rem,7vw,5.8rem);line-height:.95;margin:.15em 0}.lead{max-width:780px;color:var(--muted);font-size:1.15rem}.cta{display:inline-block;background:linear-gradient(135deg,var(--cyan),var(--violet));color:#02050a!important;font-weight:900;padding:13px 20px;border-radius:11px;margin:8px 8px 0 0}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}.card{background:linear-gradient(160deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:0 18px 50px #0005}.card h2,.card h3{margin-top:0}.tag{display:inline-block;border:1px solid var(--line);border-radius:999px;padding:4px 9px;font-size:.74rem;color:var(--muted);margin:3px}.metric{font-family:ui-monospace,monospace;color:var(--green)}.note{border-left:4px solid var(--warn);background:#201a0c;padding:14px 16px;border-radius:8px;color:#ffe8af}.lesson{max-width:900px}.lesson h1{font-size:2.5rem}.lesson h2{margin-top:2rem;color:var(--cyan)}code,pre{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}pre{background:#02050a;border:1px solid var(--line);padding:16px;border-radius:12px;overflow:auto}.check li{margin:.5rem 0}.footer{margin-top:60px;border-top:1px solid var(--line);padding:26px 0;color:var(--muted);font-size:.9rem}.progress{height:9px;background:#111b2c;border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--green),var(--cyan));width:0}.small{font-size:.88rem;color:var(--muted)}input,textarea{width:100%;padding:12px;border-radius:9px;border:1px solid var(--line);background:#080e1a;color:white;margin-top:6px}label{display:block;margin:14px 0;font-weight:700}button{background:var(--green);border:0;border-radius:9px;padding:12px 18px;font-weight:900;cursor:pointer}