body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: #f4f4f4;
  color: #222;
}

header {
  background: #0b3c5d;
  color: white;
  padding: 1.5rem;
  text-align: center;
}

.subtitle {
  opacity: 0.9;
}

nav {
  display: flex;
  justify-content: center;
  gap: 1rem;
  background: #ddd;
  padding: 0.5rem;
}

nav a {
  text-decoration: none;
  color: #000;
  font-weight: 600;
}

.card {
  background: white;
  margin: 1rem;
  padding: 1rem;
  border-radius: 6px;
}

.price {
  text-align: center;
}

.buy-button,
.donate-button {
  display: inline-block;
  background: #0b3c5d;
  color: white;
  padding: 0.75rem 1.25rem;
  text-decoration: none;
  border-radius: 4px;
  margin-top: 1rem;
}

.note {
  font-size: 0.85rem;
  opacity: 0.7;
}

footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.75rem;
  opacity: 0.6;
}