Here's a quick peek at what I've been twiddling with before I go off to look at something other than a screen for the rest of the evening. Changes made (some of which may not stay):
-The top banner is wider, and the title has been moved upward so that it's centered relative to the whole banner as it now stands (Alexandre, did you want me to try to center it in the space between the top edge and the stripe instead?) I experimented with adding a subtitle, but I couldn't get it to look right. :(
-Gradient under the nav area.
-Sans-serif font forced in the title and navigation areas only. (The exact font stack is Arial, Libre Sans, sans-serif.)
-The logo has grown again (I admit I just stretched it again rather than running off another copy at the right size, though).
-There's a veeeery faint blue-grey border stripe at the right edge of the text area to give it a bit more structure.
E. Liddell