next.config.js

/** @type {import('next').NextConfig} */
const nextConfig = {
  reactStrictMode: true,
  swcMinify: true,
  async headers() {
    return [
      {
        source: '/:path*',
        headers: [
          {
            key: 'X-DNS-Prefetch-Control',
            value: 'on'
          },
          {
            key: 'Strict-Transport-Security',
            value: 'max-age=63072000; includeSubDomains; preload'
          },
          {
            key: 'X-XSS-Protection',
            value: '1; mode=block'
          },
          {
            key: 'X-Frame-Options',
            value: 'SAMEORIGIN'
          },
          {
            key: 'X-Content-Type-Options',
            value: 'nosniff'
          },
          {
            key: 'Referrer-Policy',
            value: 'origin-when-cross-origin'
          },
          // Content Security Policy can be tricky to add strictly in dev without breaking things (like eval in dev), 
          // but we can add a basic one or leave it for specific pages. 
          // For now, these headers are strong for general production readiness.
        ]
      }
    ]
  }
}

module.exports = nextConfig