.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)}.folder-section{margin-top:2rem}.folder-title{margin-top:0;margin-bottom:1rem;font-size:1.25rem}.articles-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem}.article-card{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface)}.article-link{display:block;padding:1rem;color:inherit;text-decoration:none}.article-link:hover{text-decoration:none}.summary{color:var(--color-text-secondary);margin:.5rem 0 0;font-size:.95rem;line-height:1.5}.article-date{color:var(--color-text-light);font-size:.8125rem;margin-top:.75rem;margin-bottom:0}