// 难度系数计算
public class DifficultyScaler {
    public float baseCoefficient = 1.0f;
    public float timeMultiplier = 0.05f; // 每秒增加 5%
    
    public float GetCurrentDifficulty() {
        float timeElapsed = Time.time - GameManager.Instance.startTime;
        return baseCoefficient + (timeElapsed * timeMultiplier);
    }
    
    // 应用到怪物生成
    public int GetEnemyHP(int baseHP) {
        return Mathf.RoundToInt(baseHP * GetCurrentDifficulty());
    }
}

[System.Serializable]
public class ItemSynergy {
    public string itemA;
    public string itemB;
    public string synergyEffect; // "双倍暴击率" / "额外投射物"
}

public class SynergyManager : MonoBehaviour {
    public List<ItemSynergy> synergyDatabase;
    
    public void CheckSynergies(List<Item> playerItems) {
        foreach (var synergy in synergyDatabase) {
            if (playerItems.Contains(synergy.itemA) && 
                playerItems.Contains(synergy.itemB)) {
                ApplySynergy(synergy.synergyEffect);
            }
        }
    }
}

public class MultiplayerScaler {
    public float hpPerPlayer = 0.5f; // 每增加1人，怪物血量 +50%
    
    public int ScaleEnemyHP(int baseHP, int playerCount) {
        float multiplier = 1.0f + (hpPerPlayer * (playerCount - 1));
        return Mathf.RoundToInt(baseHP * multiplier);
    }
    
    // 金币独立掉落
    public void DropGold(Vector3 position, int baseAmount) {
        int playerCount = GameManager.Instance.GetPlayerCount();
        for (int i = 0; i < playerCount; i++) {
            SpawnGoldPickup(position, baseAmount); // 每个玩家一份
        }
    }
}