bodyStrong is a named role, not an inline weight bump. It is the same 14px at 600 — a task title against its deadline line. Naming it is what stops a widget building a TextStyle of its own, which is the rule that keeps the whole app re-typable from one file. body_sm is also DdsControl.textStyle: the control type size, shared by every button, pill, chip and text box so none of them can drift apart. §3.