Nicely done. Pico.css is a cool idea I hadn't seen before.
I have built 2 SSG's over the years, once in 2009 and one this year. So it's fun to read through someone's internal thought process on their motivations and decisions.
Someone put together this mega list of 460 SSGs that I found helpful for inspiration and learning: https://staticsitegenerators.net/. Also would be a good place to add Teeny, though not sure if they are still updating the actual website.
Not fond of Pico.css’s weight, though: over 50KB, nowhere near as lightweight as the name suggests (even if it’s above-average compressible, 8KB gzipped—but I wouldn’t count even 8KB uncompressed as pico); in this case, if you flatten the variables and strip unused code, you’re left with under 4KB (~1.4KB gzipped). Lots of bloat from unused light mode support, things like form controls, and a fair bit of frivolous custom properties usage. This is the sort of place where I see the appeal of the likes of Tailwind, because they generate such huge amounts of CSS that you just about have to use an unused style remover. But it is another build step, and contrary to the deliberate intent here.
Yes it is quite cool, I also wasn't aware of it.
I guess I finally found out the theme I have been searching for.