body {
  font-family: Arial, sans-serif;
  margin: 0; padding: 0;
  background: #f5fff5;
  color: #333;
}

header {
  background: green;
  color: white;
  padding: 1rem;
  text-align: center;
}

.cart-btn, .checkout-btn, button, .download-btn {
  display: inline-block;
  background: orange;
  color: white;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 8px;
  transition: 0.3s;
}

button:hover, .cart-btn:hover, .checkout-btn:hover, .download-btn:hover {
  background: darkorange;
  transform: scale(1.05);
}

.shop-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  padding: 20px;
}

.product-card {
  background: white;
  border-radius: 12px;
  padding: 15px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: 0.3s;
}

.product-card:hover {
  transform: scale(1.05);
}

.hidden {
  display: none;
}

#cod-error {
  color: red;
  margin: 10px 0;
  animation: shake 0.3s;
}

@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  50% { transform: translateX(5px); }
  75% { transform: translateX(-5px); }
  100% { transform: translateX(0); }
}