The site is Squarespace - a few giveaways are the favicon, the <!-- This is Squarespace. --> comment in the head section, and the fact that hitting escape opens

The site is Squarespace - a few giveaways are the favicon, the <!-- This is Squarespace. --> comment in the head section, and the fact that hitting escape opens the Squarespace login. This looks pretty different from the usual templates, so I would guess there's a lot of custom code for the visuals.