09</h2>
      <div class="controls">
        <button class="control-button" @click="toggleMode">{{ modeLabel }}</button>
        <!-- <button class="control-button" @click="startAllQuestions">重新刷全部题</button> -->
        <button class="control-button" @click="startWrongQuestions">刷错题({{ wrongQuestions.length }})</button>
      </div>
    </div>

    <div v-if="loading">
      <p>加载中...</p>
    </div>

    <div v-if="currentQuestion && !loading">
      <div class="box">
        <span>{