 iframe将动态创建和管理 -->
            </div>
        </div>

        <!-- 演示控制栏 -->
        <div class="presentation-controls">
            <button class="control-btn" id="prevBtn" onclick="previousSlide()" title="上一页 (←)">
                <i class="fas fa-chevron-left"></i>
            </button>
            
            <button class="control-btn" onclick="toggleAutoPlay()" id="autoPlayBtn" title="自动播放">
                <i class="fas fa-play"></i>
            </button>
 