Braun-school 'less but better' translated to the screen: warm neutral surfaces, black text, a precise modular grid, generous quiet space, and one small functional accent — a dot of orange or green that exists only because it marks the control that matters. Nothing decorative, nothing arbitrary, nothing loud.
Primary actionThe functional dot: a single small circle of orange (or power-switch green) marking the primary control on an otherwise achromatic panel — the interface equivalent of the one colored button on a Braun radio.