diff --git a/DOCKER.md b/DOCKER.md
index 404505e..75d10e3 100644
--- a/DOCKER.md
+++ b/DOCKER.md
@@ -103,6 +103,14 @@ RUN npm config set strict-ssl false && npm install
 
 This is necessary in some build environments with certificate validation issues.
 
+### Out of Memory During Build
+
+The production build is memory-intensive (the app compiles thousands of modules). If `docker compose up` or `docker build` fails with an out-of-memory error such as `Reached heap limit` or `cannot allocate memory` during the `npm run build` step, increase the memory available to Docker:
+
+- **Docker Desktop**: Settings, then Resources, then Memory. Set it to at least **6-8 GB** and apply.
+
+The Dockerfile raises the Node heap (`NODE_OPTIONS=--max-old-space-size`) for the build. That heap size must fit inside the memory available to Docker, so raising the Docker memory limit is the fix when the build runs out of memory.
+
 ### Container Not Starting
 
 Check the logs:
diff --git a/package-lock.json b/package-lock.json
index 2e2e1eb..86ad547 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -86,6 +86,7 @@
         "@typescript-eslint/parser": "8.11.0",
         "@vitejs/plugin-react": "^4.2.1",
         "autoprefixer": "10.4.19",
+        "cross-env": "^7.0.3",
         "esbuild": "^0.28.0",
         "eslint": "^8.57.0",
         "eslint-config-prettier": "9.1.0",
@@ -8363,6 +8364,25 @@
       "integrity": "sha512-VQ2MBenTq1fWZUH9DJNGti7kKv6EeAuYr3cLwxUWhIu1baTaXh4Ib5W2CqHVqib4/MqbYGJqiL3Zb8GJZr3l4g==",
       "license": "MIT"
     },
+    "node_modules/cross-env": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-7.0.3.tgz",
+      "integrity": "sha512-+/HKd6EgcQCJGh2PSjZuUitQBQynKor4wrFbRg4DtAgS1aWO+gU52xpH7M9ScGgXSYmAVS9bIJ8EzuaGw0oNAw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cross-spawn": "^7.0.1"
+      },
+      "bin": {
+        "cross-env": "src/bin/cross-env.js",
+        "cross-env-shell": "src/bin/cross-env-shell.js"
+      },
+      "engines": {
+        "node": ">=10.14",
+        "npm": ">=6",
+        "yarn": ">=1"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
diff --git a/package.json b/package.json
index 0fff4de..b3ff9af 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "type": "module",
   "scripts": {
     "dev": "vite",
-    "build": "tsc && vite build",
+    "build": "tsc && cross-env NODE_OPTIONS=--max-old-space-size=8192 vite build",
     "lint": "eslint -c .eslintrc.json ./src/**/**/*.{ts,tsx} --fix",
     "preview": "vite preview"
   },
@@ -88,6 +88,7 @@
     "@typescript-eslint/parser": "8.11.0",
     "@vitejs/plugin-react": "^4.2.1",
     "autoprefixer": "10.4.19",
+    "cross-env": "^7.0.3",
     "esbuild": "^0.28.0",
     "eslint": "^8.57.0",
     "eslint-config-prettier": "9.1.0",