:root{color:#202124;background:#f6f7f9;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}.app-shell{display:grid;grid-template-columns:240px 1fr;min-height:100vh}.sidebar{background:#18202f;color:#fff;padding:24px}.sidebar h1{font-size:20px;margin:0 0 32px}.sidebar nav{display:grid;gap:8px}.sidebar a{border-radius:6px;color:#d8deea;padding:10px 12px}.sidebar a.active,.sidebar a:hover{background:#2d3748;color:#fff}.content{padding:40px}.content section{max-width:880px}.content h2{font-size:32px;margin:0 0 16px}.content p,.content li{color:#4b5563;font-size:18px}@media(max-width:720px){.app-shell{grid-template-columns:1fr}.sidebar{padding:20px}.sidebar nav{grid-template-columns:repeat(auto-fit,minmax(120px,1fr))}.content{padding:24px}}