We located the CSS leak and determined its cause, as one of the libraries we use for components injected a global css reset that borked colors, and the above was manual CSS in place to "correct" them, but due to specificity, it wouldn't display the ones from the global stylesheets (which ended up only affecting light mode and not dark mode due to different specified colors in the two themes). Either way, we have removed all overriding colors and the light theme should be back to normal. If not, leave a message here with information so we can investigate further.
I would ask for more kindness in your future reports though, the team is testing as much as we can before releases but due to the enormity of the website and its code, we can still miss things but try to address issues as fast as possible.