很遗憾，css 不支持父选择器.:(
所以唯一的方法就是使用像 jQuery 父方法这样的 javascript.

Unfortunately css doesn't support parent selectors. :(
So the only way to do it is to use javascript like the jQuery parent method.

更新:CSS 选择器 Level 4 将支持父选择器！http://www.w3.org/TR/selectors4/#subject

Update: CSS Selectors Level 4 will support parent selectors! http://www.w3.org/TR/selectors4/#subject