body{margin:0;font-family:Arial,sans-serif;background:#f4f6fb;color:#222}.app{display:grid;grid-template-columns:220px 1fr;min-height:100vh}aside{background:#111827;color:#fff;padding:16px;display:flex;flex-direction:column;gap:8px}aside a{color:#cbd5e1;text-decoration:none}main{padding:24px}input,button{display:block;margin:8px 0;padding:8px}@media (max-width:960px){.app{grid-template-columns:1fr}aside{flex-direction:row;overflow:auto}}