As I understand it,
Not a complete answer, but worth to note:
If your css files were not compiled, it probably means, either:
ng build --dev) which adds
--extract-css (aliases: -ec)
Extract css from global styles onto css files instead of js ones.
ng build --prod but forgot to reference your styles as global styles in angular.cli.json:
Once you do this you will find your css files inlined, however, you will also find them in normal format as well. Cant understand why is that..