Haha, glad I could help. Theres lots of little things to learn about web/mobile dev, but it looks like you are on the right track.
As far as your concern about multiple CSS files, you are correct that you will need to load multiple files, but a work around, and whats commonly done, is to minify and concat your CSS into one file. Basically, you run your CSS files through a minifier, (I use a grunt library I can point you to) and it will spit out all your CSS into one file. You can also do this with Javascript!
It does make debugging a little more annoying, so I typically leave Concating/minifying/obfuscating until the end. Then I spend a painful night fixing all the issues that brings, then it runs smoothly 
Heres an ionic article talking about that