diff --git a/Dockerfile b/Dockerfile
index 221dd1c8..4914e6fb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -36,6 +36,6 @@ COPY --from=frontend-build /app/frontend/dist ./public
 COPY start.sh ./
 RUN chmod +x start.sh
 
-EXPOSE 3000
+EXPOSE 80
 
 CMD ["./start.sh"]
diff --git a/backend/src/index.ts b/backend/src/index.ts
index 84202021..19002580 100644
--- a/backend/src/index.ts
+++ b/backend/src/index.ts
@@ -22,7 +22,7 @@ import settingsRouter from './routes/settings';
 import notificationsRouter from './routes/notifications';
 
 const app = express();
-const PORT = parseInt(process.env.PORT || '3000', 10);
+const PORT = parseInt(process.env.PORT || '80', 10);
 
 // Trust Coolify/Traefik reverse proxy
 app.set('trust proxy', 1);
diff --git a/start.sh b/start.sh
index 42d33b9e..dee071b8 100644
--- a/start.sh
+++ b/start.sh
@@ -179,5 +179,5 @@ async function seed() {
 seed();
 " 2>/dev/null || echo "[start] Seed warning (continuing)"
 
-echo "[start] Starting Node.js backend on port 3000..."
+echo "[start] Starting Node.js backend on port ${PORT:-80}..."
 exec node dist/index.js