body { font-family: Arial, sans-serif; margin:0; padding:0; background:#f0f0f0; }
header, footer { background:#fff; padding:10px 20px; text-align:center; box-shadow:0 2px 5px rgba(0,0,0,0.1); }
nav a { margin:0 10px; text-decoration:none; color:#333; }
.products-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(200px, 1fr)); gap:15px; }
.products-grid div { background:#fff; padding:10px; border-radius:5px; }
button { cursor:pointer; padding:5px 10px; background:#28a745; color:#fff; border:none; border-radius:3px; }
input { padding:5px; margin:5px 0; width:100%; }