ion-header {
    --background: linear-gradient(135deg, #ff6f61, #fe4a49); /* 渐变背景 */
  }
  
  .promotion-card {
    background-color: white;
    border-radius: 10px;
    padding: 20px;
    margin: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
  
    .promotion-image {
      width: 100%;
      height: auto;
      border-radius: 10px;
      margin-bottom: 10px;
    }
  
    h2 {
      font-size: 20px;
      margin-bottom: 5px;
      color: #333;
    }
  
    p {
      font-size: 14px;
      color: #666;
    }
  
    .card-actions {
      display: flex;
      justify-content: space-around;
      margin-top: 10px;
    }
  }
  
  .loading-container, .error-message-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 80vh;
    text-align: center;
  }
  
  .loading-container p, .error-message-container p {
    margin-top: 10px;
    font-size: 16px;
  }