First commit

lib/main.dart

@@ -0,0 +1,63 @@
+import 'package:flutter/material.dart';
+import 'screens/home_screen.dart';
+import 'screens/add_screen.dart';
+import 'screens/vehicles_screen.dart';
+import 'screens/history_screen.dart';
+
+void main() {
+  runApp(FuelStatsApp());
+}
+
+class FuelStatsApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Fuel Stats',
+      theme: ThemeData.dark(),
+      themeMode: ThemeMode.dark,
+      home: MainNavigation(),
+    );
+  }
+}
+
+class MainNavigation extends StatefulWidget {
+  const MainNavigation({super.key});
+
+  @override
+  _MainNavigationState createState() => _MainNavigationState();
+}
+
+class _MainNavigationState extends State<MainNavigation> {
+  int _currentIndex = 0;
+
+  final List<Widget> _screens = [
+    HomeScreen(),
+    AddScreen(),
+    VehiclesScreen(),
+    HistoryScreen(),
+  ];
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: _screens[_currentIndex],
+      bottomNavigationBar: BottomNavigationBar(
+        currentIndex: _currentIndex,
+        onTap: (index) => setState(() => _currentIndex = index),
+        backgroundColor: Colors.grey[900],
+        selectedItemColor: Colors.white,
+        unselectedItemColor: Colors.grey,
+
+        items: [
+          BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
+          BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add'),
+          BottomNavigationBarItem(
+            icon: Icon(Icons.directions_car),
+            label: 'Vehicles',
+          ),
+          BottomNavigationBarItem(icon: Icon(Icons.history), label: 'History'),
+        ],
+      ),
+    );
+  }
+}