如何在手风琴上使用过渡效果

<div class="accordion">
  <div class="panel">
    <div class="panel-header">标题1</div>
    <div class="panel-content">内容1</div>
  </div>
  <div class="panel">
    <div class="panel-header">标题2</div>
    <div class="panel-content">内容2</div>
  </div>
  <!-- 添加更多的手风琴面板 -->
</div>

.accordion {
  display: flex;
  flex-direction: column;
}

.panel {
  border: 1px solid #ccc;
}

.panel-header {
  background-color: #f5f5f5;
  padding: 10px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.panel-content {
  padding: 10px;
  display: none;
  transition: display 0.3s ease;
}

.panel.active .panel-header {
  background-color: #e0e0e0;
}

.panel.active .panel-content {
  display: block;
}

const panels = document.querySelectorAll('.panel');

panels.forEach(panel => {
  const header = panel.querySelector('.panel-header');
  const content = panel.querySelector('.panel-content');
  
  header.addEventListener('click', () => {
    panel.classList.toggle('active');
  });
});