class="preview-placeholder" id="noAudioMessage"><i class="fas fa-music"></i><span data-lang-zh="尚未生成语音" data-lang-en="No audio generated yet"></span></div>
</div>
</div>
<div id="downloadContainer" style="display: none;">
<button id="downloadBtn" class="btn btn-success"><i class="fas fa-download"></i><span data-lang-zh="下载音频文件" data-lang-en="Download Audio File"></span></button>
</div>
<div class="loading" id="loadingIndicator"><span class="spinner"></span> <span data-lang-zh="正在