Rows inside the Advanced details were inheriting the standard
6px row-gap from .hwfit-serve-row (used to give the Core knobs
some breathing room). Inside Advanced — where the rows are
mostly single-line dropdowns — that read as half a row of empty
space between every pair.
Now inside Advanced only:
- grid row-gap drops to 4px
- label → control margin-top drops to 1px (was 2px)
- checks row gap also drops to 4px
Outside Advanced (Core, etc.) the original spacing stays.
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