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I see—design rule. And your website is inspiring.

Thanks! Just to add, this article https://www.refactoringui.com/previews/building-your-color-p... is good at explaining why you usually need several shades of gray (as well as shades of other colors) and related design rules.

I read it, it's a good article. It's probably an article I can recommend in the future when I talk to people about colors.