diff --git a/docker-compose.yml b/docker-compose.yml
index 7ebca88..6ff22dc 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -14,6 +14,8 @@ services:
       - ADMIN_TOKEN=${ADMIN_TOKEN:-default_insecure_token}
       - DATA_DIR=/app/data
     restart: unless-stopped
+    networks:
+      - internal_net
 
   frontend:
     build:
@@ -26,3 +28,9 @@ services:
     depends_on:
       - backend
     restart: unless-stopped
+    networks:
+      - internal_net
+
+networks:
+  internal_net:
+    driver: bridge
diff --git a/frontend/src/pages/index.astro b/frontend/src/pages/index.astro
index a52c19b..ed0010c 100644
--- a/frontend/src/pages/index.astro
+++ b/frontend/src/pages/index.astro
@@ -1,7 +1,7 @@
 ---
 import Layout from '../layouts/Layout.astro';
 
-const API_URL = import.meta.env.PUBLIC_API_URL || 'http://localhost:3000';
+const API_URL = (typeof process !== 'undefined' ? process.env.PUBLIC_API_URL : import.meta.env.PUBLIC_API_URL) || 'http://localhost:3000';
 
 interface Post {
   slug: string;
diff --git a/frontend/src/pages/posts/[slug].astro b/frontend/src/pages/posts/[slug].astro
index 585c67c..03ded96 100644
--- a/frontend/src/pages/posts/[slug].astro
+++ b/frontend/src/pages/posts/[slug].astro
@@ -3,7 +3,7 @@ import Layout from '../../layouts/Layout.astro';
 import { marked } from 'marked';
 
 const { slug } = Astro.params;
-const API_URL = import.meta.env.PUBLIC_API_URL || 'http://localhost:3000';
+const API_URL = (typeof process !== 'undefined' ? process.env.PUBLIC_API_URL : import.meta.env.PUBLIC_API_URL) || 'http://localhost:3000';
 
 interface PostDetail {
   slug: string;
diff --git a/frontend/src/pages/uploads/[...path].astro b/frontend/src/pages/uploads/[...path].astro
index fba467a..1711c19 100644
--- a/frontend/src/pages/uploads/[...path].astro
+++ b/frontend/src/pages/uploads/[...path].astro
@@ -1,6 +1,6 @@
 ---
 const { path } = Astro.params;
-const API_URL = import.meta.env.PUBLIC_API_URL || 'http://localhost:3000';
+const API_URL = (typeof process !== 'undefined' ? process.env.PUBLIC_API_URL : import.meta.env.PUBLIC_API_URL) || 'http://localhost:3000';
 
 const response = await fetch(`${API_URL}/uploads/${path}`);