vercel.json

{
  "framework": null,
  "headers": [
    {
      "source": "/(.*)",
      "headers": [
        { "key": "X-Frame-Options",           "value": "DENY" },
        { "key": "X-Content-Type-Options",     "value": "nosniff" },
        { "key": "Referrer-Policy",            "value": "strict-origin-when-cross-origin" },
        { "key": "Permissions-Policy",         "value": "camera=(), microphone=(), geolocation=(), payment=()" },
        { "key": "Cross-Origin-Opener-Policy",   "value": "same-origin" },
        { "key": "Strict-Transport-Security",    "value": "max-age=63072000; includeSubDomains; preload" },
        { "key": "Cross-Origin-Resource-Policy", "value": "same-origin" },
        {
          "key": "Content-Security-Policy",
          "value": "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src https://fonts.gstatic.com; connect-src 'self'; img-src 'self' data:; frame-ancestors 'none'; base-uri 'self'; form-action 'self';"
        }
      ]
    }
  ]
}