🎮 Shadow Runner

struct GameState {
    var isGameActive: Bool = false
    var gameOver: Bool = false
    var characterY: Double = 0
    var characterVelocity: Double = 0
    var obstacles: [Obstacle] = []
    var survivalTime: TimeInterval = 0
    var highScore: TimeInterval = 0
    var gameSpeed: Double = 150
    var obstacleSpawnInterval: TimeInterval = 2.0
}

class AudioManager: ObservableObject {
    var jumpSound: AVAudioPlayer?
    var backgroundMusic: AVAudioPlayer?
    var isBackgroundMusicEnabled = true
    var isJumpSoundEnabled = true
}

struct GameConstants {
    static func getGroundY(for screenHeight: CGFloat) -> Double {
        return Double(screenHeight * 0.85)
    }
    
    static func getCharacterStartY(for screenHeight: CGFloat) -> Double {
        return getGroundY(for: screenHeight) - characterSize/2
    }
}