(() => {
  // 展开/收起子菜单
  document.querySelectorAll('.nav-item.has-children').forEach(group => {
    const btn = group.querySelector('.nav-item-btn');
    const caret = btn.querySelector('.caret');
    const children = group.querySelector('.nav-children');
    btn.addEventListener('click', () => {
      children.classList.toggle('open');
      caret.classList.toggle('rotate');
    });
  });

  // 侧边栏折叠功能
  const sidebar = document.getElementById('sidebar');
  const toggleBtn = document.getElementById('sidebar-toggle');
  
  if (sidebar && toggleBtn) {
    // 从 localStorage 恢复状态
    const isCollapsed = localStorage.getItem('sidebar-collapsed') === 'true';
    if (isCollapsed) {
      sidebar.classList.add('collapsed');
    }

    toggleBtn.addEventListener('click', () => {
      sidebar.classList.toggle('collapsed');
      const collapsed = sidebar.classList.contains('collapsed');
      localStorage.setItem('sidebar-collapsed', collapsed);
      toggleBtn.title = collapsed ? '展开菜单' : '收起菜单';
      
      // 触发窗口 resize 事件，让图表立即重绘
      setTimeout(() => {
        window.dispatchEvent(new Event('resize'));
      }, 310); // 等待侧边栏动画完成 (300ms)
    });

    // 设置初始 title
    toggleBtn.title = sidebar.classList.contains('collapsed') ? '展开菜单' : '收起菜单';
  }
})();