You can customize style as much as you can. Take a look at Emacs theme gallery: http://pawelbx.github.io/emacs-theme-gallery/

Emacs is an IDE, first and foremost, to Emacs Lisp itself. Other Lisps are close. It's an excellent editors for other languages, and a good enough IDE for some languages. See my C/C++ guide in Emacs: http://tuhdo.github.io/c-ide.html.

Fyi, people wrote parsers, chat and email clients in Emacs that LT is still dreaming.