You can't do this without using Javascript. I highly recommend JQuery, it has a parent function to access parent items.
CSS traditionally does not have a parent selector because of performance. See http://snook.ca/archives/html_and_css/css-parent-selectors
I strongly recommend reading that as it describes how CSS is parsed by the browser and why it has it's limitations. Here's an excerpt:
On a seemingly regular basis, I see this discussion come up as to
whether CSS should have a particular feature like the parent selector
and while I haven't worked on a browser engine, I have my theories.
In short: performance.
How CSS gets evaluated With work, I've had to do quite a bit of
examination of performance. We run a number of tools over an
application to determine where the bottlenecks are. One such
application is Google Page Speed which provides a number of
recommendations to improve JavaScript and rendering performance.
Before I get into its recommendations, we need to understand a little
better about how browsers evaulate CSS.