Selection lights up the existing structural rule rather than introducing new chrome. The topbar's bottom divider becomes gold under the active tab; the sidebar leans entirely on typographic contrast — cream & bold for active, muted for the rest.
01
Top Tabs
Lit divider — the bottom rule glows gold under the active tab.
✓ Locked
Cybersteel
Dashboard
Nodes
Builds
Alerts
Logs
Settings
CONTENT
02
Side Nav
Bare brightness — active item is cream & bold; rest are muted.