I need a straightforward, reliable calculator built with Dart + Flutter that runs smoothly on Android and follows Google’s Material Design guidelines. The scope is intentionally simple—think classic four-function math (add, subtract, multiply, divide) with a clean, responsive UI that scales well across common phone screen sizes. Here’s what will make the project a success for me: • A single-screen Material Design interface with clearly labeled buttons and an easy-to-read display • Accurate handling of basic arithmetic operations, including chaining calculations and a clear/reset function • Well-structured Flutter code, free of unnecessary packages, so I can continue maintaining it after delivery • An installable APK plus the full Dart/Flutter source in a Git repository If you include concise in-code comments and a brief README on how to build or tweak the project, that will be perfect.