body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f5f5f5;
}

header {
  background: #111;
  color: #fff;
  padding: 15px;
  display: flex;
  justify-content: space-between;
}

.products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  padding: 20px;
  gap: 20px;
}

.product {
  background: #fff;
  padding: 15px;
  border-radius: 10px;
  text-align: center;
}

.product img {
  width: 100%;
  border-radius: 10px;
}

.product button {
  margin-top: 10px;
  padding: 10px;
  border: none;
  background: #000;
  color: #fff;
  cursor: pointer;
}

.cart-sidebar {
  position: fixed;
  right: -300px;
  top: 0;
  width: 300px;
  height: 100%;
  background: #fff;
  padding: 20px;
  transition: 0.3s;
  box-shadow: -2px 0 10px rgba(0,0,0,0.2);
}

.cart-sidebar.open {
  right: 0;
}

.open-cart {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 15px;
  background: #000;
  color: #fff;
  border: none;
  border-radius: 50%;
}