Meta (since it’s your site): 26px is waaaaay too large a font size for body text; I zoomed out to ⅔ before it was comfortable. Even with a comparatively small font like you’re using, I’d say never go past 20px, and I’d suggest 18px as a better upper limit (only to be applied on larger-than-mobile devices, too). Also since I’m writing, I strongly recommend against adjusting letter-spacing except for in all-caps text. (You’ve spaced headings out.) It just makes text uglier and harder to read; the designer did it the way they did for a good reason in almost all cases.
But the content I am enjoying!