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Assets/_Scripts/Stats/ModifierType.cs

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+public enum ModifierType
+{
+    FlatAdd,
+    PercentAdd,
+    PercentMultiply
+}

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Assets/_Scripts/Stats/PlayerStats.cs

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+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class PlayerStats : MonoBehaviour
+{
+    [Header("Base Values")]
+    [SerializeField] private float baseMaxHealth = 100f;
+    [SerializeField] private float baseMaxMana = 100f;
+    [SerializeField] private float baseDamage = 10f;
+    [SerializeField] private float baseMoveSpeed = 5f;
+    [SerializeField] private float baseAbilityCooldownReduction = 0f;
+    [SerializeField] private float baseCriticalChance = 0f;
+
+    [Header("Runtime Modifiers")]
+    [SerializeField] private List<StatModifier> activeModifiers = new List<StatModifier>();
+
+    private readonly Dictionary<StatType, float> baseValues = new Dictionary<StatType, float>();
+    private readonly Dictionary<StatType, float> currentValues = new Dictionary<StatType, float>();
+
+    public event Action OnStatsChanged;
+
+    public float MaxHealth { get { return GetStat(StatType.MaxHealth); } }
+    public float MaxMana { get { return GetStat(StatType.MaxMana); } }
+    public float Damage { get { return GetStat(StatType.Damage); } }
+    public float MoveSpeed { get { return GetStat(StatType.MoveSpeed); } }
+    public float AbilityCooldownReduction { get { return GetStat(StatType.AbilityCooldownReduction); } }
+    public float CriticalChance { get { return GetStat(StatType.CriticalChance); } }
+
+    // Compatibility-friendly alias for lab wording: player speed is driven by PlayerStats.speed.
+    public float speed { get { return MoveSpeed; } }
+
+    private void Awake()
+    {
+        RecalculateStats();
+    }
+
+    private void OnValidate()
+    {
+        ClampBaseValues();
+        RecalculateStats();
+    }
+
+    public IReadOnlyList<StatModifier> GetActiveModifiers()
+    {
+        return activeModifiers;
+    }
+
+    public float GetBaseStat(StatType statType)
+    {
+        EnsureBaseValues();
+        return baseValues.TryGetValue(statType, out float value) ? value : 0f;
+    }
+
+    public float GetStat(StatType statType)
+    {
+        if (currentValues.Count == 0)
+        {
+            RecalculateStats();
+        }
+
+        return currentValues.TryGetValue(statType, out float value) ? value : GetBaseStat(statType);
+    }
+
+    public void AddModifier(StatModifier modifier)
+    {
+        if (!IsValidNumber(modifier.value))
+        {
+            Debug.LogWarning($"Ignored invalid modifier value for {modifier.statType}.");
+            return;
+        }
+
+        if (string.IsNullOrWhiteSpace(modifier.sourceId))
+        {
+            modifier.sourceId = "Runtime";
+        }
+
+        activeModifiers.Add(modifier);
+        RecalculateStats();
+    }
+
+    public int RemoveModifiersBySource(string sourceId)
+    {
+        if (string.IsNullOrWhiteSpace(sourceId))
+        {
+            return 0;
+        }
+
+        int removed = activeModifiers.RemoveAll(modifier => modifier.sourceId == sourceId);
+        if (removed > 0)
+        {
+            RecalculateStats();
+        }
+
+        return removed;
+    }
+
+    public int RemoveModifiersBySourcePrefix(string sourcePrefix)
+    {
+        if (string.IsNullOrWhiteSpace(sourcePrefix))
+        {
+            return 0;
+        }
+
+        int removed = activeModifiers.RemoveAll(modifier =>
+            !string.IsNullOrEmpty(modifier.sourceId) &&
+            modifier.sourceId.StartsWith(sourcePrefix, StringComparison.Ordinal));
+
+        if (removed > 0)
+        {
+            RecalculateStats();
+        }
+
+        return removed;
+    }
+
+    public void ClearModifiers()
+    {
+        if (activeModifiers.Count == 0)
+        {
+            return;
+        }
+
+        activeModifiers.Clear();
+        RecalculateStats();
+    }
+
+    public void RecalculateStats()
+    {
+        ClampBaseValues();
+        EnsureBaseValues();
+        currentValues.Clear();
+
+        foreach (StatType statType in Enum.GetValues(typeof(StatType)))
+        {
+            float baseValue = GetBaseStat(statType);
+            float flatAdd = 0f;
+            float percentAdd = 0f;
+            float percentMultiply = 1f;
+
+            for (int i = 0; i < activeModifiers.Count; i++)
+            {
+                StatModifier modifier = activeModifiers[i];
+                if (modifier.statType != statType || !IsValidNumber(modifier.value))
+                {
+                    continue;
+                }
+
+                switch (modifier.modifierType)
+                {
+                    case ModifierType.FlatAdd:
+                        flatAdd += modifier.value;
+                        break;
+                    case ModifierType.PercentAdd:
+                        percentAdd += modifier.value;
+                        break;
+                    case ModifierType.PercentMultiply:
+                        percentMultiply *= Mathf.Max(0f, 1f + modifier.value);
+                        break;
+                }
+            }
+
+            float finalValue = (baseValue + flatAdd) * Mathf.Max(0f, 1f + percentAdd) * percentMultiply;
+            currentValues[statType] = ClampFinalValue(statType, finalValue);
+        }
+
+        OnStatsChanged?.Invoke();
+    }
+
+    private void EnsureBaseValues()
+    {
+        baseValues[StatType.MaxHealth] = Mathf.Max(0f, baseMaxHealth);
+        baseValues[StatType.MaxMana] = Mathf.Max(0f, baseMaxMana);
+        baseValues[StatType.Damage] = Mathf.Max(0f, baseDamage);
+        baseValues[StatType.MoveSpeed] = Mathf.Max(0.1f, baseMoveSpeed);
+        baseValues[StatType.AbilityCooldownReduction] = Mathf.Clamp(baseAbilityCooldownReduction, 0f, 100f);
+        baseValues[StatType.CriticalChance] = Mathf.Clamp(baseCriticalChance, 0f, 100f);
+    }
+
+    private void ClampBaseValues()
+    {
+        baseMaxHealth = Mathf.Max(0f, baseMaxHealth);
+        baseMaxMana = Mathf.Max(0f, baseMaxMana);
+        baseDamage = Mathf.Max(0f, baseDamage);
+        baseMoveSpeed = Mathf.Max(0.1f, baseMoveSpeed);
+        baseAbilityCooldownReduction = Mathf.Clamp(baseAbilityCooldownReduction, 0f, 100f);
+        baseCriticalChance = Mathf.Clamp(baseCriticalChance, 0f, 100f);
+    }
+
+    private float ClampFinalValue(StatType statType, float value)
+    {
+        if (!IsValidNumber(value))
+        {
+            return GetBaseStat(statType);
+        }
+
+        switch (statType)
+        {
+            case StatType.MoveSpeed:
+                return Mathf.Max(0.1f, value);
+            case StatType.AbilityCooldownReduction:
+            case StatType.CriticalChance:
+                return Mathf.Clamp(value, 0f, 100f);
+            default:
+                return Mathf.Max(0f, value);
+        }
+    }
+
+    private bool IsValidNumber(float value)
+    {
+        return !float.IsNaN(value) && !float.IsInfinity(value);
+    }
+}

Assets/_Scripts/Stats/PlayerStats.cs.meta

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Assets/_Scripts/Stats/StatModifier.cs

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+using System;
+
+[Serializable]
+public struct StatModifier
+{
+    public StatType statType;
+    public ModifierType modifierType;
+    public float value;
+    public string sourceId;
+
+    public StatModifier(StatType statType, ModifierType modifierType, float value, string sourceId = "")
+    {
+        this.statType = statType;
+        this.modifierType = modifierType;
+        this.value = value;
+        this.sourceId = sourceId;
+    }
+}

Assets/_Scripts/Stats/StatModifier.cs.meta

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Assets/_Scripts/Stats/StatType.cs

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+public enum StatType
+{
+    MaxHealth,
+    MaxMana,
+    Damage,
+    MoveSpeed,
+    AbilityCooldownReduction,
+    CriticalChance
+}

Assets/_Scripts/Stats/StatType.cs.meta

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