Calculator

A basic calculator web application built using vanilla HTML, CSS, and JavaScript. Preview it live here.

⚙️ Features

• Supports addition, subtraction, multiplication, and division
• Handles decimals and double-zero input
• Keyboard support for digits, operators, and functional keys
• Error handling on invalid expressions
• Read-only input field with selectable text for copy-paste
• Responsive theme based on system preference
• Accessible with appropriate ARIA labels

⌨️ Keyboard Shortcuts

• Enter or = → Evaluate expression
• Backspace → Delete last character
• Escape → Clear input
• Shift + 5 or % → Percent operation

🚀 Setup

Open index.html in any modern browser. No build tools or dependencies required.