@aaadaaam I'm seeing two different issues:
In all browsers, you have to remove the deg units from the hue calculation. The h returns a number (no unit), and it seems numbers and lengths aren't compatible for +/- operations in general. This isn't specific to relative colors.
In Safari 18TP (the only browser with full RCS support), light-dark() works fine at that point. I expect light-dark() has similar difficulties to currentColor.
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