server.js

const http = require('http');
const fs = require('fs');
const path = require('path');

const PORT = 3000;

const server = http.createServer((req, res) => {
    // Serve index.html for root path
    if (req.url === '/' || req.url === '/index.html') {
        fs.readFile(path.join(__dirname, 'index.html'), (err, data) => {
            if (err) {
                res.writeHead(500, { 'Content-Type': 'text/plain' });
                res.end('Error loading page');
                return;
            }
            res.writeHead(200, { 'Content-Type': 'text/html' });
            res.end(data);
        });
    } else {
        res.writeHead(404, { 'Content-Type': 'text/plain' });
        res.end('404 Not Found');
    }
});

server.listen(PORT, () => {
    console.log(`🚀 Calculator server is running!`);
    console.log(`📱 Open your browser and visit: http://localhost:${PORT}`);
    console.log(`Press Ctrl+C to stop the server`);
});