.lesson-section-title{display:flex;align-items:center;gap:12px;margin-bottom:16px}.lesson-section-title .section-number{display:grid;place-items:center;flex:0 0 38px;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,#155eef,#06b6d4);color:#fff;font-weight:900}.lesson-section-title h2{margin:0}.task-card{margin:20px 0;padding:20px;border:1px solid #bbf7d0;border-left:6px solid #22c55e;border-radius:20px;background:#f0fdf4}.task-card h3{margin:0 0 8px;color:#166534;font-size:1.08rem}.task-card ol{margin:10px 0 0;padding-left:22px}.example .example-label{display:inline-flex;margin-bottom:8px;padding:5px 10px;border-radius:999px;background:#e0f2fe;color:#075985;font-size:.78rem;font-weight:900;text-transform:uppercase;letter-spacing:.04em}.comparison-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:20px 0}.comparison-grid>div{padding:18px;border:1px solid #dbeafe;border-radius:18px;background:#f8fbff}.comparison-grid strong{display:block;margin-bottom:6px;color:#071b5f}.practice-section details{margin-top:12px}.practice-section summary{cursor:pointer;color:#0b46bd;font-weight:800}@media(max-width:720px){.comparison-grid{grid-template-columns:1fr}.lesson-section-title{align-items:flex-start}.lesson-section-title h2{font-size:1.35rem}}