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lib/theme/app_colors.dart

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+import 'package:flutter/material.dart';
+
+/// App color palette following the design spec
+/// Based on Morandi color system - calm and gentle
+class AppColors {
+  // Primary colors
+  static const primary = Color(0xFFA7C4BC);  // Calm Green
+  static const background = Color(0xFFF8F6F2);  // Warm off-white
+
+  // Text colors
+  static const textPrimary = Color(0xFF5B6D6D);
+  static const textSecondary = Color(0xFF8A9B9B);
+
+  // Button colors
+  static const distractionButton = Color(0xFFE0E0E0);
+  static const success = Color(0xFF88C9A1);
+
+  // Additional colors
+  static const white = Color(0xFFFFFFFF);
+  static const divider = Color(0xFFF0F0F0);
+
+  // Prevent instantiation
+  AppColors._();
+}

lib/theme/app_text_styles.dart

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+import 'package:flutter/material.dart';
+import 'package:google_fonts/google_fonts.dart';
+import 'app_colors.dart';
+
+/// Typography styles following the design spec
+/// Uses Nunito font family from Google Fonts
+class AppTextStyles {
+  // App Title
+  static final appTitle = GoogleFonts.nunito(
+    fontSize: 24,
+    fontWeight: FontWeight.w700, // Bold
+    color: AppColors.textPrimary,
+  );
+
+  // Timer Display
+  static final timerDisplay = GoogleFonts.nunito(
+    fontSize: 64,
+    fontWeight: FontWeight.w800, // ExtraBold
+    letterSpacing: 2,
+    color: AppColors.textPrimary,
+  );
+
+  // Button Text
+  static final buttonText = GoogleFonts.nunito(
+    fontSize: 18,
+    fontWeight: FontWeight.w600, // SemiBold
+    color: AppColors.white,
+  );
+
+  // Body Text
+  static final bodyText = GoogleFonts.nunito(
+    fontSize: 16,
+    fontWeight: FontWeight.w400, // Regular
+    color: AppColors.textPrimary,
+  );
+
+  // Helper Text
+  static final helperText = GoogleFonts.nunito(
+    fontSize: 14,
+    fontWeight: FontWeight.w300, // Light
+    color: AppColors.textSecondary,
+  );
+
+  // Headline
+  static final headline = GoogleFonts.nunito(
+    fontSize: 20,
+    fontWeight: FontWeight.w600, // SemiBold
+    color: AppColors.textPrimary,
+  );
+
+  // Large number (for focus minutes display)
+  static final largeNumber = GoogleFonts.nunito(
+    fontSize: 32,
+    fontWeight: FontWeight.w700, // Bold
+    color: AppColors.textPrimary,
+  );
+
+  // Encouragement quote (italic)
+  static final encouragementQuote = GoogleFonts.nunito(
+    fontSize: 16,
+    fontWeight: FontWeight.w400,
+    fontStyle: FontStyle.italic,
+    color: AppColors.textSecondary,
+  );
+
+  // Prevent instantiation
+  AppTextStyles._();
+}

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,
+    );
+  }
+}