It seems like a set of very opinionated visual design choices. For cli design guideline, I really liked https://clig.dev/ https://clig.dev/ which is actually a

It seems like a set of very opinionated visual design choices. For cli design guideline, I really liked https://clig.dev/ https://clig.dev/ which is actually about UX for the cli, and not about the eye candy. Other than that, the general idea of the startup / product it is linked to is pretty cool (i.e design guidelines in code with integration with figma and all) but it is also a no-go as it's a closed source saas company, which mean all your design specs go to hell the day the company dies/is acquired.