I like it, although there is one minor suggestion, if I may. Perhaps it's just me, but the background could be a tad darker in the right margin. Perhaps a different color for each heading so they stand out? Everything is looks really good.
Last night I didn't have the lights on and it appeared differently. As I look at it now, it's a lot better - with the lights on! But if you can figure out how to change a few colors and have the headings stand out, that would be a real boon.
Overall the layout is really good and the comments appear to be favorable. Well done.