Indeed, CSS especially is the root of all web evil. When you understand how it break all kinds of known good software design patterns, and you've seen the Frankenstein monstrosities people build with it enough times, you'll be tempted to do as I've done for a while: banish almost all use of external CSS from my projects.

I use inline styles mostly, with an external CSS file only used for a few very global styles. And I try to only use it very simply, avoiding all kinds of clever tricks that some dev think is the mark of good code.