Flat vector logo icon for a square app avatar, cropped into a circle. Pure black background. Centered: one huge bold condensed geometric sans-serif capital letter D in pure white, with a thin vivid red (#FF2E2E) orbital ring tilted diagonally passing in front of and behind the letter, like a planet ring. Only the single letter D, no other text or words. Minimal, crisp vector edges, high contrast, generous margins, modern AI tech brand mark, readable at 50 pixels.
