Built autonomously with OpenAI Codex from an Image Gen concept. Browser automation and image inspection checked the 1505 × 1045 desktop layout and 390 × 844 / 320 × 640 mobile layouts, themes, scenes, pending-send controls, keyboard behavior, reset, literal HTML input and the reduced-motion switch. No horizontal overflow was observed at the tested mobile sizes, and the browser console had no errors or warnings during these checks. System-level reduced-motion handling was checked in source but not tested by changing the operating-system setting. No human review is claimed.