public class MusicManager : MonoBehaviour
{
    [Header("Audio Sources")]
    public AudioSource layerBase;
    public AudioSource layerRhythm;
    public AudioSource layerMelody;
    public AudioSource layerHype;
    
    [Header("Settings")]
    public float fadeSpeed = 2.0f;
    
    // 目标音量 (0 或 1)
    private float[] targetVolumes = new float[4];
    
    void Update()
    {
        // 1. 获取当前游戏强度 (0-100)
        float intensity = GameDirector.Instance.GetCombatIntensity();
        
        // 2. 决定各轨道开关
        targetVolumes[0] = 1.0f; // Base 始终开启
        targetVolumes[1] = intensity > 0 ? 1.0f : 0.0f;
        targetVolumes[2] = intensity > 40 ? 1.0f : 0.0f;
        targetVolumes[3] = intensity > 80 ? 1.0f : 0.0f;
        
        // 3. 平滑过渡音量
        layerBase.volume = Mathf.Lerp(layerBase.volume, targetVolumes[0], Time.deltaTime * fadeSpeed);
        layerRhythm.volume = Mathf.Lerp(layerRhythm.volume, targetVolumes[1], Time.deltaTime * fadeSpeed);
        layerMelody.volume = Mathf.Lerp(layerMelody.volume, targetVolumes[2], Time.deltaTime * fadeSpeed);
        layerHype.volume = Mathf.Lerp(layerHype.volume, targetVolumes[3], Time.deltaTime * fadeSpeed);
    }
    
    // 确保所有轨道完全同步播放
    public void PlayTrack(MusicTrack track)
    {
        double dspTime = AudioSettings.dspTime + 0.1; // 稍微延迟以保证同步
        
        layerBase.clip = track.stemBase;
        layerRhythm.clip = track.stemRhythm;
        // ... 赋值其他轨道
        
        layerBase.PlayScheduled(dspTime);
        layerRhythm.PlayScheduled(dspTime);
        // ... 播放其他轨道
    }
}

public class BeatSynchronizer : MonoBehaviour
{
    public float bpm = 120f;
    private float secondsPerBeat;
    private float nextBeatTime;
    
    public event Action OnBeat; // 节拍事件
    
    void Start()
    {
        secondsPerBeat = 60f / bpm;
        nextBeatTime = AudioSettings.dspTime + secondsPerBeat;
    }
    
    void Update()
    {
        if (AudioSettings.dspTime >= nextBeatTime)
        {
            OnBeat?.Invoke();
            nextBeatTime += secondsPerBeat;
        }
    }
}