* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
    }

    body {
      background-color: #f8f9fa;
      color: #333;
      line-height: 1.6;
    }

    .container {
      max-width: 800px;
      margin: 0 auto;
      padding: 20px;
      text-align: center;
    }

    header {
      margin: 40px 0;
    }

    h1 {
      font-size: 28px;
      color: #4a90e2;
      margin-bottom: 10px;
    }

    .desc {
      font-size: 16px;
      color: #666;
      max-width: 600px;
      margin: 0 auto;
    }

    /* 选项卡样式 */
    .tab-container {
      margin: 30px 0;
    }

    .tab-nav {
      display: flex;
      justify-content: center;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: 20px;
    }

    .tab-btn {
      padding: 10px 24px;
      background-color: #eee;
      border: none;
      border-radius: 30px;
      font-size: 16px;
      color: #666;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .tab-btn.active {
      background-color: #4a90e2;
      color: white;
    }

    .tab-btn:hover:not(.active) {
      background-color: #ddd;
    }

    /* 客服卡片布局 */
    .kefu-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .kefu-card {
      background-color: #fff;
      border-radius: 12px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      padding: 40px 20px;
      display: none;
      /* 默认隐藏所有卡片 */
    }

    .kefu-card.active {
      display: block;
      /* 激活的标签对应卡片显示 */
    }

    /* QQ头像样式 */
    .kefu-avatar {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      margin: 0 auto 15px;
      overflow: hidden;
      border: 3px solid #4a90e2;
    }

    .kefu-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .kefu-info {
      margin-bottom: 30px;
    }

    .kefu-info p {
      font-size: 18px;
      margin-bottom: 10px;
    }

    .kefu-qq {
      font-size: 20px;
      color: #4a90e2;
      font-weight: bold;
      text-decoration: none;
    }

    .kefu-qq:hover {
      text-decoration: underline;
    }

    .contact-btn {
      display: inline-block;
      background-color: #4a90e2;
      color: #fff;
      padding: 12px 36px;
      border-radius: 30px;
      text-decoration: none;
      font-size: 16px;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .contact-btn:hover {
      background-color: #357abd;
      transform: translateY(-2px);
    }

    footer {
      margin-top: 60px;
      padding: 20px 0;
      border-top: 1px solid #eee;
      font-size: 14px;
      color: #999;
    }

    .beian {
      color: #999;
      text-decoration: none;
      margin-top: 10px;
      display: inline-block;
    }

    .beian:hover {
      color: #4a90e2;
      text-decoration: underline;
    }

    /* 响应式调整 */
    @media (max-width: 768px) {
      h1 {
        font-size: 24px;
      }

      .tab-btn {
        padding: 8px 18px;
        font-size: 15px;
      }

      .kefu-card {
        padding: 30px 15px;
      }

      .contact-btn {
        padding: 10px 28px;
        font-size: 15px;
      }

      .kefu-avatar {
        width: 70px;
        height: 70px;
      }
    }

    /* 弹窗样式 */
    .popup-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 9999;
    }

    .popup-content {
      width: 300px;
      padding: 20px;
      background: white;
      border-radius: 12px;
      text-align: center;
      box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    }

    #closeBtn {
      margin-top: 15px;
      padding: 8px 20px;
      border: none;
      border-radius: 4px;
      background: #4a90e2;
      color: white;
      cursor: pointer;
      font-size: 16px;
    }

    #closeBtn:disabled {
      background: #cccccc;
      cursor: not-allowed;
    }

    .countdown-tip {
      color: #999;
      font-size: 12px;
      margin-top: 8px;
    }

    .popup-content h3 {
      color: #4a90e2;
      margin-bottom: 10px;
    }