body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
}

header {
  background-color: #4CAF50;
  color: white;
  padding: 2rem;
  text-align: center;
  position: relative;
}

#cart {
  position: absolute;
  top: 20px;
  right: 20px;
  background: white;
  color: #333;
  padding: 0.5rem 1rem;
  border-radius: 5px;
  font-weight: bold;
}

#checkout-button {
  background-color: #ff9800;
  color: white;
  border: none;
  padding: 0.3rem 0.8rem;
  margin-left: 10px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.9rem;
}

#checkout-button:hover {
  background-color: #e68a00;
}

main {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  padding: 2rem;
}

.app-card {
  background: white;
  padding: 1rem;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  text-align: center;
  transition: transform 0.2s;
}

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

.app-card img {
  width: 120px;
  height: 120px;
  object-fit: contain;
}

.app-card h2 {
  font-size: 1.2rem;
  margin: 1rem 0 0.5rem;
}

.price {
  color: #4CAF50;
  font-weight: bold;
  margin-bottom: 1rem;
}

button {
  background-color: #4CAF50;
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #45a049;
}

footer {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}

@media (max-width: 600px) {
  #cart {
    top: 10px;
    right: 10px;
    font-size: 0.9rem;
  }

  #checkout-button {
    margin-top: 5px;
    display: block;
  }
}