body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background: #f8f8f8;
}
header {
  background: #111;
  color: white;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
}
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  padding: 1rem;
}
.product {
  background: white;
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  text-align: center;
}
button {
  margin: 0.5rem;
  padding: 0.5rem 1rem;
  background: black;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}