@Jo there's much more in that site. Look at the iPhone mockup. (and the :before trick) kudos to the designer. If they really built their website completely inside BSS that's an impressive achievement.
Yeah I was looking at some of that stuff wondering if they had to use any custom code for some of it. Still even if they did, that's quite an awesome site.
2 things I'd suggest since it seems to be pretty much a 1 page site. Sticky nav or pop out so people can get back to it, and/or a back to top setup on the page so people can click a button or link to go back to the top to the nav. Bout the only things I see missing, very well done indeed!
FYI - The "Get Started" button/link on your Work page does not work. The light gray corporate logos/links on the home page are all set to the home page.