Centre logo and nav

Hi there,

I am attempting to centre my site’s logo (sitename) and the nav bar. As evident from my site thus far (link below), I have positioned the logo along the top, whilst the nav is situated along the bottom.
If anybody could help me out centre both of these in a way that would be suitable for all screen sizes and media I’d greatly appreciate it. I’m close, yet so far.

Site here: http://goo.gl/SaIusP

Thanks!