
:root{--bg:#061533;--paper:#f8fbff;--ink:#061533;--muted:#c8d7ff;--gold:#ffd54f;--gold2:#ffb300;--primary:#6d5dfc;--line:rgba(255,255,255,.18);--panel:rgba(255,255,255,.09)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:radial-gradient(circle at 10% 0%,rgba(255,213,79,.18),transparent 30%),linear-gradient(135deg,var(--bg),#020814 75%);color:white;min-height:100vh}a{color:inherit}.topbar{position:sticky;top:0;z-index:20;background:rgba(2,8,20,.88);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.topbar-inner{max-width:1440px;margin:auto;padding:12px 20px;display:flex;justify-content:space-between;gap:14px;align-items:center}.brand{font-size:20px;font-weight:1000;color:var(--gold)}.search{max-width:360px;width:100%;background:rgba(255,255,255,.08);border:1px solid var(--line);border-radius:999px;padding:10px 14px;color:white}.shell{max-width:1440px;margin:auto;padding:22px;display:grid;grid-template-columns:300px minmax(0,1fr) 330px;gap:18px;align-items:start}.sidebar,.resources,.hero,.section{border:1px solid var(--line);border-radius:24px;background:linear-gradient(135deg,rgba(255,255,255,.13),rgba(255,255,255,.05));box-shadow:0 22px 60px rgba(0,0,0,.32)}.sidebar,.resources{position:sticky;top:74px;max-height:calc(100vh - 90px);overflow:auto;padding:18px}.sidebar h3,.resources h3{color:var(--gold);margin-top:0}.tree a,.res-link,.lesson-link{display:block;text-decoration:none;padding:10px 12px;border-radius:14px;margin:6px 0;background:rgba(255,255,255,.06);border:1px solid transparent}.tree .active{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#061533;font-weight:900}.hero{padding:34px;margin-bottom:18px}.hero h1{font-size:clamp(34px,5vw,70px);line-height:1;margin:14px 0}.hero p{font-size:20px;color:var(--muted)}.badge{display:inline-flex;background:linear-gradient(135deg,var(--gold),var(--gold2));color:#061533;padding:9px 16px;border-radius:999px;font-weight:1000}.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;background:linear-gradient(135deg,var(--primary),#8b5cf6);color:white;border:0;border-radius:999px;padding:12px 16px;font-weight:900;cursor:pointer}.btn.gold{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#061533}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}.section{background:var(--paper);color:var(--ink);padding:26px;margin:18px 0}.section h2{margin-top:0;color:#001e55}.section p,.section li{font-size:17px;line-height:1.7}.lesson-hero{border:1px solid var(--line);border-radius:28px;padding:28px;margin-bottom:18px;background:linear-gradient(135deg,rgba(255,213,79,.18),rgba(109,93,252,.12))}.lesson-hero h1{font-size:clamp(30px,4vw,54px);margin:12px 0}.progress-track{height:14px;background:rgba(255,255,255,.14);border-radius:999px;overflow:hidden}.progress-fill{height:100%;width:var(--p);background:linear-gradient(90deg,var(--gold),#00c853);border-radius:999px}.path,.cmd{background:#07101f;color:#e8f1ff;border-radius:14px;padding:14px;font-family:Consolas,monospace;white-space:pre-wrap;overflow:auto}.task{background:#eef5ff;border:1px solid #b8d4ff;border-radius:18px;padding:18px;margin:14px 0}.ok{background:#ecfdf5;border:1px solid #86efac;border-radius:16px;padding:14px}.files{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}.file{background:#eef5ff;color:#001e55;text-decoration:none;border:1px solid #b8d4ff;border-radius:14px;padding:12px;font-weight:900}.file.primary{background:#fff4bf;border-color:#ffb300}.svg-frame{width:100%;border:1px solid #b8d4ff;border-radius:18px;background:#fff;padding:10px}.code{background:#07101f;color:#e8f1ff;border-radius:18px;overflow:hidden}pre{margin:0;padding:20px;overflow:auto}details.solution{border:2px dashed #9a7cff;border-radius:20px;padding:16px;background:#f7f4ff}details.solution summary{cursor:pointer;font-weight:900;color:#4c1d95;font-size:18px}.checklist label{display:block;margin:12px 0;font-weight:800}.nav{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:20px 0}.tiny{font-size:13px;color:var(--muted)}@media(max-width:1180px){.shell{grid-template-columns:1fr}.sidebar,.resources{position:static;max-height:none}.topbar-inner{flex-wrap:wrap}}
