:root{--bg: #0f0a1e;--bg-soft: #17102e;--surface: #1d1538;--surface-2: #251a45;--border: #33265c;--border-soft: #2a2050;--text: #f4f1fb;--text-soft: #c7bfe0;--text-dim: #948bb8;--primary: #8b5cf6;--primary-strong: #7c3aed;--primary-soft: rgba(139, 92, 246, .14);--accent: #fbbf24;--accent-2: #f472b6;--green: #34d399;--red: #fb7185;--shadow: 0 18px 50px -18px rgba(0, 0, 0, .7);--radius: 18px;--radius-sm: 12px;--maxw: 1180px;--nav-h: 66px;--font: "Be Vietnam Pro", system-ui, -apple-system, sans-serif;--font-head: "Plus Jakarta Sans", var(--font)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased;background-image:radial-gradient(60% 50% at 100% 0%,rgba(139,92,246,.12),transparent 60%),radial-gradient(50% 40% at 0% 10%,rgba(244,114,182,.08),transparent 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p{color:var(--text-soft);max-width:720px;margin-top:12px;font-size:1.05rem}.section-title{font-size:clamp(1.4rem,3vw,1.9rem);margin-bottom:6px}.section-sub{color:var(--text-dim);margin-bottom:24px}.nav{position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:100;display:flex;align-items:center;background:#0f0a1eb8;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--border-soft)}.nav-inner{display:flex;align-items:center;gap:18px;width:100%}.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-head);font-weight:800;font-size:1.05rem;white-space:nowrap}.brand-logo{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--primary),var(--accent-2));display:grid;place-items:center;flex-shrink:0}.brand-logo svg{width:20px;height:20px}.brand 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var(--primary);display:grid;place-items:center;font-size:.72rem;font-weight:800;color:var(--primary);z-index:1}.tl-week h3{font-size:1.15rem}.tl-week .wk-label{color:var(--primary);font-weight:700;font-size:.8rem;text-transform:uppercase;letter-spacing:.08em}.lesson-layout{display:grid;grid-template-columns:260px 1fr;gap:34px;align-items:start}.lesson-sidebar{position:sticky;top:calc(var(--nav-h) + 24px);background:var(--surface);border:1px solid var(--border-soft);border-radius:var(--radius);padding:16px;max-height:calc(100vh - var(--nav-h) - 48px);overflow-y:auto}.lesson-sidebar h4{font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;color:var(--text-dim);margin-bottom:12px}.lesson-nav a{display:block;padding:9px 12px;border-radius:9px;font-size:.88rem;color:var(--text-soft);margin-bottom:2px;transition:all .15s}.lesson-nav a:hover{background:var(--surface-2);color:var(--text)}.lesson-nav a.active{background:var(--primary-soft);color:#fff;font-weight:600}@media (max-width: 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td{border-bottom:none}.mt-40{margin-top:40px}.mt-24{margin-top:24px}.mb-24{margin-bottom:24px}.text-center{text-align:center}.flex-between{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}