The inner cards (Nachrichten-Ton / Klingelton / Audio-Gerät / Hotkeys /
…) looked like they had a stark white outline. The cause: --color-line
is a semi-transparent white token, and applying the `/60` alpha modifier
in `border-line/60` overrides the original alpha — so the inner border
ended up brighter than the outer Section's normal `border-line`.
Drop the border entirely. Background tint + caps heading is enough
grouping signal in a tab-pattern panel.