🧪 Technology Mobile Development Simulation

Every mobile app has to render correctly on hundreds of different screen sizes, and the way developers solve this is a constraint-based layout engine, not hard-coded pixel positions. This simulator renders a live phone mockup in 3D and runs a real layout-resolution pass over four UI elements — a status bar, a hero image, a text block and a bottom nav bar — each governed by a fixed, percentage, or aspect-locked constraint. Drag the screen width and height, rotate the device, or jump between device presets and watch each element's position and size resolve instantly, with automatic clipping detection flagging any element that would overflow the visible screen — the exact class of bug a mobile developer hunts for when testing responsive layouts across devices.