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lib/theme/app_theme.dart

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+import 'package:flutter/material.dart';
+import 'package:google_fonts/google_fonts.dart';
+import 'app_colors.dart';
+import 'app_text_styles.dart';
+
+/// App theme configuration
+class AppTheme {
+  static ThemeData get lightTheme {
+    return ThemeData(
+      useMaterial3: true,
+
+      // Color scheme
+      colorScheme: ColorScheme.light(
+        primary: AppColors.primary,
+        surface: AppColors.background,
+        onPrimary: AppColors.white,
+        onSurface: AppColors.textPrimary,
+      ),
+
+      // Scaffold
+      scaffoldBackgroundColor: AppColors.background,
+
+      // AppBar
+      appBarTheme: AppBarTheme(
+        backgroundColor: AppColors.background,
+        elevation: 0,
+        centerTitle: true,
+        titleTextStyle: AppTextStyles.appTitle,
+        iconTheme: const IconThemeData(color: AppColors.textPrimary),
+      ),
+
+      // Elevated Button
+      elevatedButtonTheme: ElevatedButtonThemeData(
+        style: ElevatedButton.styleFrom(
+          backgroundColor: AppColors.primary,
+          foregroundColor: AppColors.white,
+          minimumSize: const Size(double.infinity, 56),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ),
+          elevation: 4,
+          textStyle: AppTextStyles.buttonText,
+        ),
+      ),
+
+      // Text Button
+      textButtonTheme: TextButtonThemeData(
+        style: TextButton.styleFrom(
+          foregroundColor: AppColors.textSecondary,
+          textStyle: AppTextStyles.bodyText,
+        ),
+      ),
+
+      // Default text theme - Use Google Fonts
+      textTheme: GoogleFonts.nunitoTextTheme(
+        TextTheme(
+          displayLarge: AppTextStyles.timerDisplay,
+          headlineMedium: AppTextStyles.headline,
+          bodyLarge: AppTextStyles.bodyText,
+          bodyMedium: AppTextStyles.helperText,
+          labelLarge: AppTextStyles.buttonText,
+        ),
+      ),
+
+      // Font family - Use Google Fonts
+      fontFamily: GoogleFonts.nunito().fontFamily,
+    );
+  }
+}