:root{--bg:#f9fafb;--fg:#111827;--accent:#b91c1c;--accent-soft:#fee2e2;--border-soft:#e5e7eb;--font-sans:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}*,:after,:before{box-sizing:border-box}body{margin:0;font-family:var(--font-sans);background:var(--bg);color:var(--fg)}main{max-width:960px;margin:0 auto;padding:2rem 1.5rem 4rem}h1,h2,h3{font-weight:600}nav{border-bottom:1px solid var(--border-soft);background:#fff}nav .nav-inner{max-width:960px;margin:0 auto;padding:.75rem 1.5rem;display:flex;gap:1rem;flex-wrap:wrap;align-items:center;justify-content:space-between}nav a{text-decoration:none;color:#374151;font-size:.95rem}nav a:hover{color:var(--accent)}.nav-links{display:flex;gap:.75rem;flex-wrap:wrap}.breadcrumb{font-size:.8rem;color:#6b7280}.breadcrumb,.card{margin-bottom:1rem}.card{border-radius:.75rem;border:1px solid var(--border-soft);padding:1rem 1.25rem;background:#fff}.card h2{margin-top:0;color:var(--accent)}.grid{display:grid;grid-gap:1rem;gap:1rem}@media (min-width:768px){.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}}ul.topic-list{margin:.25rem 0 .75rem}ul.topic-list li{margin-left:1.25rem}table{width:100%;border-collapse:collapse;margin-top:.75rem;font-size:.95rem}td,th{border:1px solid var(--border-soft);padding:.4rem .6rem;text-align:left}th{background:#f3f4f6;font-weight:600}