s="difficulty-dot active"></span>
                    <span class="difficulty-dot active"></span>
                    <span class="difficulty-dot active"></span>
                </div>
                <button class="start-quiz-btn" data-level="环保专家">开始测验</button>
            </div>
        </div>
        
        <div id="quiz-container" class="quiz-container" style="display: none;">
            <div class="quiz-header">
                <h2 id="quiz-title">测验标题</h2>
                <