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Looks nice. I agree that the red nav menu should be changed somehow - the clarity isn't the best with red on black. If, for example, they were all white, then you used some other sort of selection style (bold or underline) then I think it would look much more professional.
Signup for invites needs more padding and the top and/or bottom and needs to be aligned better with the other content. Perhaps make the fields bigger as well?
