body { font-family: sans-serif; background:#fff; color:#111; margin:0; padding:0; }
header { background:#7c3aed; color:white; padding:1em; text-align:center; }
#product-list { display:grid; grid-template-columns:repeat(auto-fit, minmax(200px, 1fr)); gap:1em; padding:1em; }
.product { border:1px solid #ddd; padding:1em; border-radius:8px; }
button { background:#7c3aed; color:white; border:none; padding:0.5em 1em; cursor:pointer; border-radius:6px; }