Thanks you for sharing CSS structure guide, It is very interesting, but I found a drawback based on my experience when the role of "person responsible the look & feel" is shared between team-mates. Some developers (who raised up when jQuery was must-be library in any project) have practice to supply implicit class selector i.e. when they search elements with class name '.link' via document.querySelector. I like the rscss(-like) way, because BEM which is very difficult to follow for newbies (especially now, when react is so popular). But, hey is it a next competitive standard as in famous xkcd [1]?

[1]: https://xkcd.com/927/