Tabs

Peer views of the same object. Never a wizard, never navigation between pages.

variant="default" raises the active tab inside a muted trough; variant="underline" draws a 2px rule beneath it.
Tabs own views within the current destination and never repeat a sidebar or top-nav item.
Switching a tab narrows the list only — metrics above it do not move.
Every panel shows one data state. A tab is not a step in a flow.