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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.