.product-list{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;padding:0;list-style:none;display:grid}.product-card{background:#fff;border:1px solid #ddd;border-radius:8px;padding:16px}.product-card h2{margin:0 0 8px;font-size:1.1rem}.error{color:#b00020}body{color:#222;background:#f5f5f5;margin:0;font-family:system-ui,sans-serif}.app{max-width:960px;margin:0 auto;padding:24px 16px}