diff --git a/frontend/src/app/api/config/route.ts b/frontend/src/app/api/config/route.ts
index 6b447f3..8cae51c 100644
--- a/frontend/src/app/api/config/route.ts
+++ b/frontend/src/app/api/config/route.ts
@@ -3,17 +3,35 @@ import { NextResponse } from 'next/server';
 /**
  * Runtime Configuration API
  * 
- * This endpoint returns environment variables that can be read at runtime,
- * allowing the application to use different configurations without rebuilding.
+ * This endpoint returns environment variables that are read at RUNTIME,
+ * not build time. This allows changing configuration without rebuilding.
  * 
- * Usage: Fetch /api/config on app initialization and use the returned values.
+ * IMPORTANT: Use env vars WITHOUT the NEXT_PUBLIC_ prefix here!
+ * - NEXT_PUBLIC_* = baked in at build time (bad for runtime config)
+ * - Regular env vars = read at runtime (good!)
+ * 
+ * In your .env or container config, set:
+ *   API_URL=https://api.example.com
+ *   BACKOFFICE_URL=https://backoffice.example.com
+ *   (etc.)
+ * 
+ * The NEXT_PUBLIC_* versions are only used as fallbacks for local dev.
  */
 export async function GET() {
+    // Priority: Runtime env vars > Build-time NEXT_PUBLIC_* > Defaults
     const config = {
-        apiUrl: process.env.NEXT_PUBLIC_API_URL || 'http://localhost:8521',
-        backofficeUrl: process.env.NEXT_PUBLIC_BACKOFFICE_URL || 'http://localhost:3001',
-        seederApiUrl: process.env.NEXT_PUBLIC_SEEDER_API_URL || 'http://localhost:3002',
-        scraperApiUrl: process.env.NEXT_PUBLIC_SCRAPER_API_URL || 'http://localhost:3003',
+        apiUrl: process.env.API_URL
+            || process.env.NEXT_PUBLIC_API_URL
+            || 'http://localhost:8521',
+        backofficeUrl: process.env.BACKOFFICE_URL
+            || process.env.NEXT_PUBLIC_BACKOFFICE_URL
+            || 'http://localhost:3001',
+        seederApiUrl: process.env.SEEDER_API_URL
+            || process.env.NEXT_PUBLIC_SEEDER_API_URL
+            || 'http://localhost:3002',
+        scraperApiUrl: process.env.SCRAPER_API_URL
+            || process.env.NEXT_PUBLIC_SCRAPER_API_URL
+            || 'http://localhost:3003',
     };
 
     return NextResponse.json(config, {
@@ -23,3 +41,4 @@ export async function GET() {
         },
     });
 }
+