What css framework does EasySocial use?

Hi, I am impressed with the Easysocial progress so far and I am considering to buy it. But my biggest concern is regarding your css FW. I read somewhere that you are gonna be using bootstrap 3. That may not work best for me since my template doesn't use BS and if you are using BS it will cause conflicts and I will be left with a lot of patch up work to do. It will be perfect if you use custom css and media queries since there won't be that much conflicts to deal with and users don't need to download the entire BS file just for easysocial. So that brings to my question- what css do you use and how have you designed these? Please give me some insights in your css so I can understand how I may need to integrate it with my templates.