🧮 Responsive Calculator (HTML, CSS, JavaScript)

This is a simple yet fully responsive calculator web app built using HTML, CSS, and JavaScript. It performs basic arithmetic operations like addition, subtraction, multiplication, division, percentage, and supports decimal numbers.

💡 Features

• Responsive design (mobile & desktop friendly)
• Dark modern UI
• Basic operations: +, −, ×, ÷, %, clear, backspace
• Interactive UI using JavaScript
• Error handling for invalid expressions
• Supports keyboard input (optional)

🚀 Technologies Used

• HTML5 for structure
• CSS3 (Flexbox & Media Queries) for styling and responsiveness
• JavaScript (vanilla) for functionality

📱 Responsive Preview

The calculator automatically adjusts its layout based on the screen size — no need to zoom or scroll on mobile.

🛠️ How to Use

1. Clone the repository or download the .zip file.
2. Open index.html in your browser.
3. Start calculating!