How to Change Application Colors
App colors are defined in lib/core/theme/colors.dart:
class AppColors {
static const Color primaryColor = Color(0xFF00A0FF);
static const Color secondaryColor = Color(0xFFF0842A);
static const Color tertiaryColor = Color(0xFF00A8CA);
static const Color surfaceColor = Color(0xff242424);
static const Color outlineColor = Color.fromARGB(255, 90, 90, 90);
static const Color black = Color(0xFF000000);
static const Color white = Color(0xFFFFFFFF);
static const List<Color> screenBackgroundGradient = [
Color(0xff262C30),
Color(0xff161719),
];
}

Change the values, not the variable/field names — every screen references these constants by name (AppColors.primaryColor, etc.), so renaming a field means updating every call site too.