:root{--bg:#061426;--panel:#0d2038;--panel-2:#102943;--line:#24486e;--text:#e8f1ff;--muted:#a9bdd6;--accent:#43d9ff;--accent-2:#4ade80;--code:#020914;--shadow:0 16px 40px rgba(0,0,0,.22)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:linear-gradient(180deg,#061426,#081a2e 45%,#061426);color:var(--text);font:16px/1.7 system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:var(--accent)}a:hover{text-decoration:none}header{border-bottom:1px solid var(--line);background:#061426f5;position:sticky;top:0;z-index:10}nav{max-width:1120px;margin:auto;padding:14px 20px;display:flex;gap:18px;align-items:center;flex-wrap:wrap}nav .brand{font-weight:900;color:#fff;text-decoration:none;font-size:1.15rem;margin-right:auto}.brand span{color:var(--accent)}main{max-width:1120px;margin:auto;padding:38px 20px 72px}.breadcrumbs{font-size:.9rem;color:var(--muted);margin-bottom:18px}.hero{padding:30px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(135deg,var(--panel),#0a1b30);box-shadow:var(--shadow)}h1{font-size:clamp(2rem,5vw,3.4rem);line-height:1.1;margin:0 0 12px}h2{line-height:1.25;margin-top:34px;color:#fff}h3{color:#cfe7ff}.lead{font-size:1.1rem;color:var(--muted);max-width:850px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px;margin-top:24px}.card{display:block;text-decoration:none;color:var(--text);padding:22px;border:1px solid var(--line);border-radius:18px;background:var(--panel);transition:transform .15s,border-color .15s}.card:hover{transform:translateY(-2px);border-color:#43d9ff}.card h2{margin:0 0 8px;font-size:1.2rem;color:#fff}.card p{margin:0;color:var(--muted)}.meta{font-size:.85rem;color:#8fb1d4}.lesson{margin-top:26px;padding:24px;border:1px solid var(--line);border-radius:18px;background:#0d2038e0}.lesson:first-of-type{margin-top:24px}.step{display:grid;grid-template-columns:40px 1fr;gap:14px;align-items:start;margin:18px 0}.num{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#1677ff;color:#fff;font-weight:800}.tip,.warning{padding:16px 18px;border-radius:12px;margin:18px 0}.tip{border:1px solid #1d8059;background:#0b2b27}.warning{border:1px solid #765d20;background:#2b230b}.tip strong{color:var(--accent-2)}.warning strong{color:#ffd36a}pre,code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}code{background:var(--code);padding:2px 6px;border-radius:6px;color:#d8f3ff}pre{background:var(--code);border:1px solid #173653;padding:16px;border-radius:12px;overflow:auto;color:#d8f3ff}table{width:100%;border-collapse:collapse;margin:18px 0}th,td{text-align:left;padding:11px;border-bottom:1px solid var(--line);vertical-align:top}th{color:#cfe7ff}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.button{display:inline-block;padding:10px 15px;border-radius:10px;background:#1677ff;color:#fff;text-decoration:none;font-weight:800}.button.secondary{background:#102d4b;border:1px solid var(--line)}footer{border-top:1px solid var(--line);padding:26px 20px;color:var(--muted);text-align:center}ul,ol{padding-left:24px}.next{margin-top:30px}@media(max-width:650px){main{padding:24px 14px 54px}.hero,.lesson{padding:18px}nav{padding:12px 14px}.step{grid-template-columns:34px 1fr}.num{width:30px;height:30px}}