public func setSmoothLevel(smoothLevel: Float) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func setWhitenessLevel(whitenessLevel: Float) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func setRuddyLevel(ruddyLevel: Float) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func reset() {
    fatalError("\\(#function) must be overridden by subclass")
}

// Get singleton instance
let store = BaseBeautyStore.shared

// Subscribe to state changes
store.state.subscribe { state in
    print("Smooth level: \\(state.smoothLevel)")
    print("Whiteness level: \\(state.whitenessLevel)")
    print("Ruddy level: \\(state.ruddyLevel)")
}

// Set beauty effects
store.setSmoothLevel(smoothLevel: 5)
store.setWhitenessLevel(whitenessLevel: 3)
store.setRuddyLevel(ruddyLevel: 2)

// Reset all beauty effects
store.reset()