.speech-rate-slider {
        -webkit-appearance: none;
        appearance: none;
        height: 4px;
        background: #475d5b;
        outline: none;
        border-radius: 2px;
      }
      .speech-rate-slider::-webkit-slider-thumb {
        -webkit-appearance: none;
        appearance: none;
        width: 16px;
        height: 16px;
        background: #00473e;
        cursor: pointer;
        border-radius: 50%;
      }
      .speech-rate-slider::-moz-range-thumb {
        width: 16px;
        height: 16px;
        background: #00473e;
        cursor: pointer;
        border-radius: 50%;
        border: none;
      }

      /* 自定义消息提示样式 */
      .toast-container {
        position: fixed;
        top: 20px;
        left: 50%;
        transform: translateX(-50%);
        z-index: 2000;
        display: flex;
        flex-direction: column;
        gap: 10px;
        pointer-events: none;
      }

      .toast-message {
        background: #00473e;
        color: #f2f7f5;
        padding: 12px 20px;
        border-radius: 8px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        min-width: 300px;
        max-width: 500px;
        animation: slideDown 0.3s ease-out;
        pointer-events: auto;
        position: relative;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
      }

      .toast-message.success {
        background: #00473e;
      }

      .toast-message.error {
        background: #fa5246;
      }

      .toast-message.warning {
        background: #faae2b;
      }

      .toast-message.info {
        background: #475d5b;
      }

      @keyframes slideDown {
        from {
          opacity: 0;
          transform: translateY(-20px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      .toast-close {
        background: rgba(242, 247, 245, 0.2);
        border: none;
        color: #f2f7f5;
        width: 20px;
        height: 20px;
        border-radius: 50%;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        padding: 0;
        font-size: 14px;
        line-height: 1;
        transition: background 0.2s;
      }

      .toast-close:hover {
        background: rgba(250, 174, 43, 0.3);
      }

      .toast-content {
        flex: 1;
        word-wrap: break-word;
      }