<style>
  /* 子選單容器樣式 */
  .ai-submenu-container {
    width: 100%;
    background-color: rgba(26, 11, 75, 0.95);
    z-index: 9999;
    left: 0;
    right: 0;
    transition: all 0.3s ease;
  }
  
  /* 固定在頂部時的樣式 */
  .ai-submenu-container.sticky {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(26, 11, 75, 0.95);
    box-shadow: 0 4px 12px rgba(0, 255, 255, 0.2);
    z-index: 9999;
  }
  
  /* 子選單內容區域 */
  .ai-submenu-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 15px 20px;
    background-color: rgba(26, 11, 75, 0.95);

  }
  
  /* 選單項目樣式 */
  .ai-submenu-item {
    color: white;
    text-decoration: none;
    padding: 10px 25px;
    margin: 5px 10px;
    border-radius: 30px;
    font-size: 16px;
    transition: all 0.3s ease;
    font-family: "微軟正黑體", Arial, sans-serif;
    cursor: pointer;
    text-align: center;
    display: inline-block;
  }
  
  /* 選單項目懸停效果 */
  .ai-submenu-item:hover {
    background-color: rgba(0, 255, 255, 0.2);
    color: #00ffff;
  }
  
  /* 佔位元素，防止內容跳動 */
  .ai-submenu-placeholder {
    display: none;
    width: 100%;
  }
  
  /* 響應式調整 */
  @media (max-width: 768px) {
    .ai-submenu-content {
      padding: 10px;
    }
    
    .ai-submenu-item {
      padding: 8px 15px;
      font-size: 14px;
      margin: 3px 5px;
    }
  }
</style>
<script>
  document.addEventListener('DOMContentLoaded', function() {
    const submenu = document.querySelector('.ai-submenu-container');
    const placeholder = document.querySelector('.ai-submenu-placeholder');
    const submenuOffsetTop = submenu.offsetTop; // 獲取選單原始位置
    
    function handleScroll() {
      if (window.pageYOffset > submenuOffsetTop) {
        // 當滾動超過選單原始位置時，添加sticky類
        submenu.classList.add('sticky');
        placeholder.classList.add('active');
      } else {
        // 否則移除sticky類
        submenu.classList.remove('sticky');
        placeholder.classList.remove('active');
      }
    }
    
    // 監聽滾動事件
    window.addEventListener('scroll', handleScroll);
    
    // 初始檢查
    handleScroll();
  });
</script>