Can confirm, this is an org file export. Much of the difficulty here was the hackery involved 'escaping' the restrictions of the generated HTML. For example, take a look at this: "margin-left: min(calc(0px - var(--body-left) - var(--body-padding)), calc(30rem - 50vw - 0.5var(--body-left) + 0.5var(--body-right)))". That took a while, and some head scratching :P
That's cool, but why are you calculating CSS attributes dynamically at export time instead of just writing a stylesheet and putting that in an export theme? Separating presentation from content, etc.
