it is easier to implement than other things that have been worked on, such as the integrated PDF reader and note editor coming in Zotero 6.
I use a simple utility called NegativeScreen (https://zerowidthjoiner.net/negativescreen), which works on your entire display, and inverts darks and lights while attempting to preserve colours overall. So I just leave all Windows applications in light mode and use NegativeScreen when I want everything in dark mode. That way I don't have to worry about the fact that some applications have dark modes and others don't. It's also really easy to use keyboard shortcuts to toggle NegativeScreen on and off.
Not a dealbreaker that dark mode's not there since Zotero's so great otherwise, but it'd be a huge quality of life improvement.
In any case, we're well aware of the demand here and will do it as soon as we're able to.
Note that Zotero for iOS, now in beta, fully supports Dark Mode, including for reading PDFs.
Also, I hope an Android version in already in the works.
Also dark mode looks more classy :)
In the new beta PDF reader, dark mode for PDFs would be fantastic. If that's too difficult to implement, then the option to change the PDF background to off-white (grey or sepia) would be much appreciated.
It's not perfect and not apply dark mode in some interface elements, but it's something while devs are working in a real solution.
This file is hosted in github: https://github.com/Rosmaninho/Zotero-Dark-Theme
Thank you for your work! :)
I couldn't get Rosmaninho's Dark Theme to work, so I would really appreciate an out of the box dark mode (across all OSs).