@violetto One thing I was wondering about in the current status, is setting h1.firstHeading (serif heading) to bold. But I can't see that in your mockups. See for example https://livingstyleguide.wmflabs.org/wiki/Guiders
It looks like a implementation failure to me to have both - serif bold and non-bold headings. I'd suggest to either just set it to normal or even increase font-size much higher like 36px or even 42px.

@violetto Oh, I see, on https://phabricator.wikimedia.org/M64/179/ it's different (and bold). Where to go?

It's safe to say that the currently implemented style guide is not 100%. I'd say refer to mock-ups to be safe.

As you can see in the link that you mentioned, the "Colors" is significantly larger than "Palette." We'd like to get there someday!

If you give me a number (for the font-size) and another number (for the font-weight), we'll might get there this week!

I actually have it all done here. You can copy and paste the styles pretty much!

Related task: @Volker_E.