Responsive Calculator Web Application

A modern and fully responsive calculator web application built using HTML5, CSS3, and Vanilla JavaScript. The calculator supports basic arithmetic operations with a clean and intuitive user interface. It includes real-time input handling, error validation for invalid expressions, keyboard-friendly interactions, and a responsive layout that works seamlessly across desktops, tablets, and mobile devices. The project demonstrates strong JavaScript fundamentals, DOM manipulation, event handling, and clean, maintainable code.