/* ローディングスピナー */
.loader-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
}

.loader {
  border: 4px solid #f3f3f3; /* Light grey */
  border-top: 4px solid #3498db; /* Blue */
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  display: block;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}