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var(--line);border-radius:8px;background:var(--paper);padding:18px}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.topic-card{border:1px solid var(--line);border-radius:8px;background:var(--paper);padding:18px}.topic-card:nth-child(2){border-top-color:var(--blue)}.topic-card:nth-child(3){border-top-color:var(--accent)}.topic-card:nth-child(4){border-top-color:var(--gold)}.topic-card p{margin:0;color:var(--muted)}.site-footer{margin-top:auto;border-top:1px solid var(--line);padding:28px 0;color:var(--muted)}.footer-inner{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}@media (max-width: 860px){.header-inner{align-items:flex-start;flex-direction:column;justify-content:center;padding:14px 0}.nav{width:100%;overflow-x:auto;padding-bottom:4px}.hero-grid,.article-hero,.article-body,.split,.grid,.topic-grid{grid-template-columns:1fr}.article-note{position:static}}