Several reasoning blocks of one Assistant message rendered 16px apart inside the response body, while process rows of different steps sit 4px apart. A signature-only reasoning block renders no row but left its empty wrapper in the flex body, adding a full block gap.
Styles only: inside a step-group reasoning part, whose body holds only reasoning rows, the block gap is 4px, and an empty reasoning wrapper cancels its gap like a hidden one. A keyless web e2e pins the rendered gaps.
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