Gmail ignoring all <style> tag css

I’m using the Foundation eMail framework. I’ve put the foundation CSS in a style tag and other CSS in another style tag. It works fine in Thunderbird and and Apple Mail.

However in Gmail it just ignores all Styles. According to Google’s guide this should work: https://developers.google.com/gmail/design/css

But it doesnt.Has anybody an idea why?
In the foundation demo themplates CSS is embeded the same way