32×32 icon button (lg), 24×24 (md) · 4px padding · 1px gray-5 border on hover only. Pro regular is the default weight everywhere. Solid appears only as a deliberate filled counterpart: circle-check (Select with a value, footer nav), check-square (Checkbox), heart (favourited), paper-plane (chat send), circle-play, and check / circle-info / pencil / xmark inside the VDP.