.topic-header{padding:3rem 0 1.5rem;border-bottom:1px solid var(--color-border);margin-bottom:1.5rem;text-align:center}.topic-header .description{color:var(--color-text-secondary)}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem}.topic-card{display:block;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);text-decoration:none;color:inherit;padding:1rem}.topic-card:hover{text-decoration:none}.topic-card h2{margin-top:0;margin-bottom:.5rem;font-size:1.1rem}.topic-card p{margin:0;color:var(--color-text-secondary);font-size:.95rem}