It is like the next evolution of Tailwind. See this blog post for full explanation: https://antfu.me/posts/reimagine-atomic-css
Other tools (except for Tachyons, these are maybe out of scope for a home lab):
- Tachyons [0] is a small (16K-ish) utility class framework.
- DaisyUI [1] is a free and open source component lib for Tailwind.
- WindiCSS [2] is built on Tailwind with some additional features.
- UnoCSS [3], an interesting on-demand atomic CSS engine that supports Tailwind CSS, WindiCSS, Bootstrap, and Tachyons.
[0]: https://tachyons.io/
[1]: https://daisyui.com/
[1] https://github.com/unocss/unocss
If you mean build your own design system then I've built four separate design systems in SCSS since 2009. I've been fine with switching to Tailwind instead because I can get similar results customizing the theme, it's more comprehensive than my systems, and the network effect advantages of somethign popular vs my one-off thing.