@media (prefers-color-scheme: [name]) seems more extensible, but this feels simpler and easier to read.
Glad the function accepts custom properties (CSS "variables").
Should probably add a color property that doesn't use this function as a fallback for browsers that don't support it.
> The values for this feature might be expanded in the future (to express a more active preference for light color schemes, or preferences for other types of color schemes like "sepia"). As such, the most future-friendly way to use this media feature is by negation such as (prefers-color-scheme: dark) and (not (prefers-color-scheme: dark)), which ensures that new values fall into at least one of the styling blocks.
[0]: https://drafts.csswg.org/mediaqueries-5/#prefers-color-schem...