diff --git a/pages/_document.tsx b/pages/_document.tsx
index b2fff8b..757ab47 100644
--- a/pages/_document.tsx
+++ b/pages/_document.tsx
@@ -3,7 +3,20 @@ import { Html, Head, Main, NextScript } from "next/document";
 export default function Document() {
   return (
     <Html lang="en">
-      <Head />
+      <Head>
+        {/* Google Analytics GA4 — G-6EJVCK4931 */}
+        <script async src="https://www.googletagmanager.com/gtag/js?id=G-6EJVCK4931" />
+        <script
+          dangerouslySetInnerHTML={{
+            __html: `
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments);}
+              gtag('js', new Date());
+              gtag('config', 'G-6EJVCK4931');
+            `,
+          }}
+        />
+      </Head>
       <body>
         <Main />
         <NextScript />
