I need a lightweight Android calculator that performs the four basic operations—Addition, Subtraction, Multiplication and Division—nothing more. The interface must follow a clean, minimalistic aesthetic: single screen, large tappable keys, and a discreet result display that scales nicely across common phone sizes. Smooth performance, accurate calculations, and adherence to current Android design guidelines matter more to me than fancy animations or extra screens. Kotlin in Android Studio is preferred, but Java is perfectly fine if that speeds you up. Feel free to lean on standard Material components to keep things consistent. Deliverables • Complete Android Studio project with well-commented source • Signed release-ready APK • Quick README explaining build steps and any external libraries used Once I install the APK and see reliable results for all basic operations, the project is done.