Kinario

private func chapterStatus(
    storyIndex: Int,
    chapterIndex: Int
) -> ChapterProgressStatus {
    guard stories.indices.contains(storyIndex) else { return .locked }
    let story = stories[storyIndex]

    let previousStoriesComplete = stories.prefix(storyIndex)
        .flatMap(\.chapters)
        .allSatisfy { reference in
            progressByStoryID[reference.id]?.completion != nil
        }
    let completions = story.chapters.map {
        progressByStoryID[$0.id]?.completion
    }
    return ChapterProgressStatus.resolve(
        at: chapterIndex,
        completions: completions,
        previousStoriesComplete: previousStoriesComplete
    )
}

Progress-Aware Chapter Navigation: Players need to understand what is complete, what comes next, and what is still locked without leaving the illustrated story map. Resolve each chapter's visual state from persisted completion data, require earlier stories to be complete, and attach localized accessibility labels to every state.

private func startAnimation() {
    withAnimation(.easeOut(duration: 0.55)) {
        contentOpacity = 1
        contentScale = 1
        contentOffset = 0
    }

    DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
        guard !didFinish else { return }
        didFinish = true

        withAnimation(.easeInOut(duration: 0.45)) {
            contentOpacity = 0
            contentScale = 0.985
        }
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.28) {
            onFinish()
        }
    }
}

Timed Onboarding Transition: Kinario opens with a short character introduction that should feel intentional without trapping the player behind a long loading sequence. Coordinate opacity, scale, and offset with a guarded delayed transition so the completion callback fires once even while the character frame animation is running.

func play(_ track: Track = .menu) {
    if currentTrack == track, player?.isPlaying == true { return }

    guard let url = Bundle.main.url(
        forResource: track.rawValue,
        withExtension: "mp3"
    ) else { return }

    let session = AVAudioSession.sharedInstance()
    try? session.setCategory(.ambient, options: [.mixWithOthers])

    let audioPlayer = try? AVAudioPlayer(contentsOf: url)
    audioPlayer?.numberOfLoops = -1
    audioPlayer?.volume = volume * baseVolumeMultiplier
    audioPlayer?.play()
    player = audioPlayer
    currentTrack = track
}

Context-Aware Audio Management: Menu and gameplay music need to support the story while leaving room for narration, voice-over, and sound-effect previews. Use one shared AVAudioPlayer, persist the player's volume, switch named tracks without restarting the current one, and temporarily duck music for SFX previews.