votianlt/app/lib/app_theme.dart

import 'package:flutter/material.dart';

class AppColors {
  static const Color primary = Color(0xFF2563EB);
  static const Color primaryStrong = Color(0xFF1D4ED8);
  static const Color primarySoft = Color(0xFFE8F0FF);
  static const Color secondary = Color(0xFF0F4C5C);
  static const Color secondarySoft = Color(0xFFDDEEF2);
  static const Color success = Color(0xFF059669);
  static const Color successSoft = Color(0xFFE7F6F1);
  static const Color warning = Color(0xFFD97706);
  static const Color warningSoft = Color(0xFFFFF4E5);
  static const Color danger = Color(0xFFDC2626);
  static const Color dangerSoft = Color(0xFFFDECEC);
  static const Color surface = Color(0xFFFFFFFF);
  static const Color surfaceMuted = Color(0xFFF7FAFF);
  static const Color scaffold = Color(0xFFF5F7FB);
  static const Color scaffoldAccent = Color(0xFFEEF4FF);
  static const Color border = Color(0xFFD6DDE7);
  static const Color borderStrong = Color(0xFFC6D0DD);
  static const Color text = Color(0xFF1E293B);
  static const Color textStrong = Color(0xFF0F172A);
  static const Color textMuted = Color(0xFF64748B);
}

class AppGradients {
  static const LinearGradient shellBackground = LinearGradient(
    begin: Alignment.topLeft,
    end: Alignment.bottomRight,
    colors: [
      AppColors.scaffoldAccent,
      AppColors.surfaceMuted,
      AppColors.scaffold,
    ],
    stops: [0, 0.45, 1],
  );
}

ThemeData buildAppTheme() {
  final colorScheme = ColorScheme.fromSeed(
    seedColor: AppColors.primary,
    brightness: Brightness.light,
  ).copyWith(
    primary: AppColors.primary,
    onPrimary: Colors.white,
    primaryContainer: AppColors.primarySoft,
    onPrimaryContainer: AppColors.primaryStrong,
    secondary: AppColors.secondary,
    onSecondary: Colors.white,
    secondaryContainer: AppColors.secondarySoft,
    onSecondaryContainer: AppColors.secondary,
    tertiary: AppColors.success,
    onTertiary: Colors.white,
    tertiaryContainer: AppColors.successSoft,
    onTertiaryContainer: AppColors.success,
    surface: AppColors.surface,
    onSurface: AppColors.textStrong,
    onSurfaceVariant: AppColors.textMuted,
    outline: AppColors.border,
    surfaceTint: Colors.transparent,
    error: AppColors.danger,
    onError: Colors.white,
  );
  final baseTheme = ThemeData(useMaterial3: true, colorScheme: colorScheme);
  const radius = Radius.circular(14);
  final border = OutlineInputBorder(
    borderRadius: const BorderRadius.all(radius),
    borderSide: const BorderSide(color: AppColors.border),
  );

  return baseTheme.copyWith(
    scaffoldBackgroundColor: AppColors.scaffold,
    canvasColor: AppColors.scaffold,
    textTheme: baseTheme.textTheme
        .apply(bodyColor: AppColors.text, displayColor: AppColors.textStrong)
        .copyWith(
          headlineMedium: baseTheme.textTheme.headlineMedium?.copyWith(
            fontWeight: FontWeight.w700,
            color: AppColors.textStrong,
          ),
          titleLarge: baseTheme.textTheme.titleLarge?.copyWith(
            fontWeight: FontWeight.w700,
            color: AppColors.textStrong,
          ),
          bodyLarge: baseTheme.textTheme.bodyLarge?.copyWith(
            color: AppColors.text,
          ),
          bodyMedium: baseTheme.textTheme.bodyMedium?.copyWith(
            color: AppColors.text,
          ),
        ),
    appBarTheme: const AppBarTheme(
      backgroundColor: AppColors.primarySoft,
      foregroundColor: AppColors.primaryStrong,
      surfaceTintColor: Colors.transparent,
      elevation: 0,
    ),
    cardTheme: const CardThemeData(
      color: AppColors.surface,
      surfaceTintColor: Colors.transparent,
      elevation: 0,
      margin: EdgeInsets.zero,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(18)),
        side: BorderSide(color: AppColors.border),
      ),
    ),
    dividerTheme: const DividerThemeData(
      color: AppColors.border,
      space: 1,
      thickness: 1,
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: AppColors.surface,
      labelStyle: const TextStyle(color: AppColors.textMuted),
      hintStyle: const TextStyle(color: AppColors.textMuted),
      prefixIconColor: AppColors.textMuted,
      suffixIconColor: AppColors.textMuted,
      border: border,
      enabledBorder: border,
      focusedBorder: border.copyWith(
        borderSide: const BorderSide(color: AppColors.primary, width: 1.5),
      ),
      errorBorder: border.copyWith(
        borderSide: const BorderSide(color: AppColors.danger),
      ),
      focusedErrorBorder: border.copyWith(
        borderSide: const BorderSide(color: AppColors.danger, width: 1.5),
      ),
    ),
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        backgroundColor: AppColors.primary,
        foregroundColor: Colors.white,
        disabledBackgroundColor: AppColors.border,
        disabledForegroundColor: AppColors.textMuted,
        elevation: 0,
        padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 14),
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
        textStyle: const TextStyle(fontWeight: FontWeight.w600),
      ),
    ),
    outlinedButtonTheme: OutlinedButtonThemeData(
      style: OutlinedButton.styleFrom(
        foregroundColor: AppColors.primaryStrong,
        side: const BorderSide(color: AppColors.border),
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
        padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 14),
      ),
    ),
    textButtonTheme: TextButtonThemeData(
      style: TextButton.styleFrom(
        foregroundColor: AppColors.primaryStrong,
        textStyle: const TextStyle(fontWeight: FontWeight.w600),
      ),
    ),
    snackBarTheme: SnackBarThemeData(
      behavior: SnackBarBehavior.floating,
      backgroundColor: AppColors.textStrong,
      contentTextStyle: baseTheme.textTheme.bodyMedium?.copyWith(
        color: Colors.white,
      ),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
    ),
    badgeTheme: const BadgeThemeData(
      backgroundColor: AppColors.primary,
      textColor: Colors.white,
    ),
    progressIndicatorTheme: const ProgressIndicatorThemeData(
      color: AppColors.primary,
    ),
    listTileTheme: const ListTileThemeData(iconColor: AppColors.textMuted),
  );
}