*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,sans-serif;line-height:1.6}nav{background:#333;padding:1rem}nav a{color:#fff;margin-right:1rem;text-decoration:none}nav a:hover{text-decoration:underline}nav a.active{font-weight:700;text-decoration:underline}.container{max-width:1200px;margin:0 auto;padding:2rem}h1{margin-bottom:1rem}.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1rem}.product-card{border:1px solid #ddd;padding:1rem;border-radius:8px}.product-card h3{margin-bottom:.5rem}.btn{background:#007bff;color:#fff;border:none;padding:.5rem 1rem;border-radius:4px;cursor:pointer}.btn:hover{background:#0056b3}