Ha! I've never done that before lol - here we go!

I think your two background modes should be light, or disco - - they're bright, colourful and positive, it makes one feel GOOD to look at it; And you were bang on, coral looks so good in a logo!
A white/Disco site with coral film logo welcoming people? On a landing page LITTERED with media in carousels, enticing people to browse, and click, and explore long before pages of forum discussions are on their page.
Anything but dark with red and gray - coral and teal would be so nice - - and other fan edit sites, and loads of dark web forums already use red and darkness and it risks being dungeonesque - - I really think bright will be so nice for everyone involved and visiting!
But you have Vito rights and decisions! - - I'd say two modes/background colours is a decision, anything more is indecision masked as choice.
And I like the logo nodding to film/editing - but again - these are *sloppy musings* - you can dismiss them all!