Already looks better, I was using a 0 2px 5px with 0.50 opaque, because on light wallpapers it was too present.
And I would like to have an opaque top panel (was using 0.80 with 37,35,35) and not too dark like Gnome. So the wallpaper shines a little thru which is nice and on dark wallpapers the panel does not just disappear in black. But maybe even 37,35,35 could be too dark, needs more testing.
The color combinations work for me, nice and clean! On your reference picture you can also find the buttons I prefer, I try to get rid of the borders around buttons to fit the overall design and work with layers and shadows instead.
In the case of the breadcrumbs, it’s getting too dark and the background layer of “Working” will melt together with the background on cheap monitors. Like said on the dark background we have to use light layers to separate and hold the contrast. If it is not working at all, I would try a middle/light grey for the border or a soft shadow if possible.
I already know that they discussed the Ubuntu logo instead of the “Activities” text, but they said that this not a good idea because of the official documentation and Ubuntu/Gnome help documents/website. I’m also not sure how it will look and feel… did you try to include it next to the right corner icons instead of the on/off and arrow icons?
And what about the widgets and elements: do you build them or can I build them and send it to you to try them?
Thanks, good feeling to make progress here