@gordon i did port some parts from traditional ok to scss and put them directly into yaru.
Later this day i ll post the code with a link here of my idea.Plain scss source.
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Yaru on ubuntu is a very flat theme. The borders have a very hard contrast expecially but not limited to titlebars. To give it a name would be high contrast extreme. If it were monochrome and using borders -/box shadows in a very refined way it would be a great theme too.
Traditional ok css code is several years old now. Even if raveit65 does a great job maintaining it is nearly impossible to port it to gtk4 using the actual code base.