Dark mode was introduced to StackOverflow about a year ago (blog post), but as of now, it still isn't available on our site (or any other site as far as I know).
Back then, it was stated that
For now, we have no plans to bring dark mode to the many sites across the Stack Exchange network. Many of the designs on our sites have been around long enough that converting them to dark mode would require redoing the artwork completely. We would prefer to avoid giving anyone across our network a substandard experience and we don’t want to change those elements without the input of these communities.
and in the corresponding meta question:
At this point, the focus of Dark Mode is on Stack Overflow and we’ll eventually bring it to MSO. While the retheming we did across the network two years ago makes updating our LESS easier, creating dark versions of all of our sites, particularly the custom-designed ones, is going to be a huge challenge we’re not able to contemplate at this time. The artwork on some of those sites simply can’t be made dark because we don’t have access to the original art files and, to be honest, some of the themes will always be better as-is.
Personally, I'm a huge fan of dark mode and I would love to see it on RPG SE. However, the issues mentioned in the blog post are present on this site. Compared to other sites, I think we have an average* amount of artwork (in fact, I can't think of anything other than the top banner, "Role-playing Games" text, and the "boxy" background on the front page). Of those, I'd expect the banner to be the most difficult to modify, but there's already a
black-and-white-version on meta, which could probably be turned into something dark-mode-compatible.
The remaining page elements are mostly of uniform colour, and as such should be fairly easy to modify. Also, as controversial as the change was, the introduction of the new network-wide unified themes does make the implementation of a dark mode easier.
*for example, worldbuilding has more artwork, while Board & Card Games has none at all
Based on the phrasing in the blog & meta posts, I don't expect SE itself to approach us with a dark mode design. Therefore, we would need to manually create at least a first draft that solves potential issues with our front page artwork and thereby proves the viability of a dark mode on this site. This, of course, still doesn't guarantee that Stack Exchange Inc. cares at all about implementing a dark mode provided by us users. However, as a consolation prize, we'd at least still have a community-designed dark theme that I'm sure could be applied individually with the appropriate browser extensions.
Being somewhat experienced in web design, I'd be happy to tinker with CSS variables and the like myself, but I'm unsure what to do about the front page artwork. And either way, I don't want to create a makeshift dark mode just for myself - the goal is to end up with a (more or less) full-fledged dark mode with support from the community that we would have an easy/easier time convincing SE to implement.
Therefore, before I create a draft that at least styles the front page (excluding the artwork), I want to query your opinion.
Do you approve of the potential introduction of a dark mode and would you use it? Do you think we should aim to approach SE Inc. with a community-designed draft at all, or do you think aiming for a theme that can be applied individually with the help of (for example) browser extensions is more realistic? Do you perhaps already have a custom dark mode script because you have to think of The Weeknd whenever you open RPG SE?
Obviously, any feedback from SE officials (especially on whether or not a community-supplied draft is helpful at all for them) is also welcome, although I personally wouldn't actively contact them without a usable first draft.
Given the fact that I managed to create a proof of concept (= it doesn't look great, but it proves that a dark mode is feasible), I consider the "realistically possible" aspect to be solved.
However, that still leaves the task of actually creating the respective style sheet and subsequently the task of attempting to get SE to implement a possibility for site-specific dark mode styling (as unlikely as getting them to do that is).
Concerning the former issue: I'll probably create a stylesheet either way, but I would very much appreciate support from others, especially if you have web development or design experience (as I'm unsure which colors would be well-suited).