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# Multi-Level Navigation Menu
复杂布局挑战：多级导航菜单
题目要求：
1. 实现一个多级导航菜单，要求：
2. 使用纯CSS实现下拉菜单
3. 添加平滑的展开/收起动画
4. 实现悬停和焦点状态
5. 支持键盘导航
6. 响应式设计