body {
  background-color: #f0f2f5; /* 一個柔和的淺灰色作為備用 */
  background-image: linear-gradient(to top, #dfe9f3 0%, white 100%);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.card {
  border: none;
  border-radius: 0.75rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease-in-out;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.08);
}

.btn-primary {
  transition: all 0.2s ease-in-out;
}

.btn-primary:hover {
  transform: scale(1.05);
}

/* 頁面切換的淡入效果 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

main.container {
  animation: fadeIn 0.5s ease-in-out;
}