Ask HN: What do you use to document CSS?

I've been experimenting with various tools to generated documentation for CSS files, and I think I may be missing something.

I prefer not to mention the ones I've tested, because I'm sincerely concerned that my mentioning it will prevent someone else from describing how they use one of the utilities, and I'm curious to see answers that aren't primed by a mention of a specific tool.

So what do you use to generate documentation / style guides from your CSS? Is there a particular workflow that works well for you?