baron-sso/userfront/lib/core/theme/app_theme.dart

import 'package:flutter/material.dart';

ThemeData buildLightTheme() {
  final scheme =
      ColorScheme.fromSeed(
        seedColor: const Color(0xFF1A1F2C),
        brightness: Brightness.light,
      ).copyWith(
        surface: Colors.white,
        surfaceContainerLowest: const Color(0xFFF7F8FA),
        surfaceContainerLow: const Color(0xFFF3F4F6),
        surfaceContainerHighest: const Color(0xFFE5E7EB),
        outline: const Color(0xFFD1D5DB),
        outlineVariant: const Color(0xFFE5E7EB),
        primary: const Color(0xFF1A1F2C),
        onPrimary: Colors.white,
        onSurface: const Color(0xFF111827),
        onSurfaceVariant: const Color(0xFF6B7280),
      );
  return _buildTheme(scheme);
}

ThemeData buildDarkTheme() {
  final scheme =
      ColorScheme.fromSeed(
        seedColor: const Color(0xFF7DD3FC),
        brightness: Brightness.dark,
      ).copyWith(
        surface: const Color(0xFF0F172A),
        surfaceContainerLowest: const Color(0xFF020617),
        surfaceContainerLow: const Color(0xFF111827),
        surfaceContainerHighest: const Color(0xFF1F2937),
        outline: const Color(0xFF334155),
        outlineVariant: const Color(0xFF1E293B),
        primary: const Color(0xFFBAE6FD),
        onPrimary: const Color(0xFF082F49),
        onSurface: const Color(0xFFF8FAFC),
        onSurfaceVariant: const Color(0xFF94A3B8),
      );
  return _buildTheme(scheme);
}

ThemeData _buildTheme(ColorScheme colorScheme) {
  final isDark = colorScheme.brightness == Brightness.dark;
  final base = ThemeData(
    useMaterial3: true,
    colorScheme: colorScheme,
    fontFamily: 'NotoSansKR',
  );

  return base.copyWith(
    scaffoldBackgroundColor: colorScheme.surfaceContainerLowest,
    pageTransitionsTheme: const PageTransitionsTheme(
      builders: {
        TargetPlatform.android: NoTransitionsBuilder(),
        TargetPlatform.iOS: NoTransitionsBuilder(),
        TargetPlatform.linux: NoTransitionsBuilder(),
        TargetPlatform.macOS: NoTransitionsBuilder(),
        TargetPlatform.windows: NoTransitionsBuilder(),
        TargetPlatform.fuchsia: NoTransitionsBuilder(),
      },
    ),
    appBarTheme: AppBarTheme(
      elevation: 0,
      centerTitle: false,
      backgroundColor: colorScheme.surface,
      foregroundColor: colorScheme.onSurface,
      surfaceTintColor: Colors.transparent,
    ),
    cardTheme: CardThemeData(
      color: colorScheme.surface,
      elevation: 0,
      surfaceTintColor: Colors.transparent,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(16),
        side: BorderSide(color: colorScheme.outlineVariant),
      ),
    ),
    dividerTheme: DividerThemeData(
      color: colorScheme.outlineVariant,
      thickness: 1,
    ),
    drawerTheme: DrawerThemeData(
      backgroundColor: colorScheme.surface,
      surfaceTintColor: Colors.transparent,
    ),
    dialogTheme: DialogThemeData(
      backgroundColor: colorScheme.surface,
      surfaceTintColor: Colors.transparent,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(24)),
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: isDark ? colorScheme.surfaceContainerLow : colorScheme.surface,
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(14),
        borderSide: BorderSide(color: colorScheme.outline),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(14),
        borderSide: BorderSide(color: colorScheme.outline),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(14),
        borderSide: BorderSide(color: colorScheme.primary, width: 1.4),
      ),
      labelStyle: TextStyle(color: colorScheme.onSurfaceVariant),
      hintStyle: TextStyle(color: colorScheme.onSurfaceVariant),
      prefixIconColor: colorScheme.onSurfaceVariant,
    ),
    filledButtonTheme: FilledButtonThemeData(
      style: FilledButton.styleFrom(
        minimumSize: const Size.fromHeight(50),
        backgroundColor: colorScheme.primary,
        foregroundColor: colorScheme.onPrimary,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
      ),
    ),
    outlinedButtonTheme: OutlinedButtonThemeData(
      style: OutlinedButton.styleFrom(
        foregroundColor: colorScheme.onSurface,
        side: BorderSide(color: colorScheme.outline),
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
      ),
    ),
    tabBarTheme: TabBarThemeData(
      dividerColor: colorScheme.outlineVariant,
      labelColor: colorScheme.onSurface,
      unselectedLabelColor: colorScheme.onSurfaceVariant,
      indicatorColor: colorScheme.primary,
    ),
  );
}

class NoTransitionsBuilder extends PageTransitionsBuilder {
  const NoTransitionsBuilder();

  @override
  Widget buildTransitions<T>(
    PageRoute<T> route,
    BuildContext context,
    Animation<double> animation,
    Animation<double> secondaryAnimation,
    Widget child,
  ) {
    return child;
  }
}