body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header, nav {
  background: #111;
  color: #fff;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a, nav input {
  margin: 0 0.5rem;
  color: white;
  text-decoration: none;
}

.hero {
  text-align: center;
  padding: 2rem;
}

.products, .cart {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding: 1rem;
}

.product-card, .cart-item {
  border: 1px solid #ccc;
  padding: 1rem;
}