diff --git a/Assets/Scripts/Core/Logging.cs b/Assets/Scripts/Core/Logging.cs
new file mode 100644
index 00000000..9f636cd6
--- /dev/null
+++ b/Assets/Scripts/Core/Logging.cs
@@ -0,0 +1,23 @@
+namespace Core
+{
+    public static class Logging
+    {
+        [System.Diagnostics.Conditional("ENABLE_LOG")]
+        public static void Debug(object message)
+        {
+            UnityEngine.Debug.Log(message);
+        }
+        
+        [System.Diagnostics.Conditional("ENABLE_LOG")]
+        public static void Warning(object message)
+        {
+            UnityEngine.Debug.LogWarning(message);
+        }
+        
+        [System.Diagnostics.Conditional("ENABLE_LOG")]
+        public static void Error(object message)
+        {
+            UnityEngine.Debug.LogError(message);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/Scripts/Core/Logging.cs.meta b/Assets/Scripts/Core/Logging.cs.meta
new file mode 100644
index 00000000..f11c0dc4
--- /dev/null
+++ b/Assets/Scripts/Core/Logging.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 99ee122ee6ee4b57b40c03be4479b124
+timeCreated: 1760446431
\ No newline at end of file
diff --git a/Assets/Scripts/Core/QuickAccess.cs b/Assets/Scripts/Core/QuickAccess.cs
index 17fd16f1..954860c7 100644
--- a/Assets/Scripts/Core/QuickAccess.cs
+++ b/Assets/Scripts/Core/QuickAccess.cs
@@ -2,6 +2,7 @@
 using AppleHills.Data.CardSystem;
 using Cinematics;
 using Core;
+using Data.CardSystem;
 using Input;
 using PuzzleS;
 
diff --git a/Assets/Scripts/Data/CardSystem/CardInventory.cs b/Assets/Scripts/Data/CardSystem/CardInventory.cs
new file mode 100644
index 00000000..ae1479f8
--- /dev/null
+++ b/Assets/Scripts/Data/CardSystem/CardInventory.cs
@@ -0,0 +1,203 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+namespace AppleHills.Data.CardSystem
+{
+    /// <summary>
+    /// Manages the player's collection of cards and booster packs
+    /// </summary>
+    [Serializable]
+    public class CardInventory
+    {
+        // Dictionary of collected cards indexed by definition ID
+        [SerializeField] private Dictionary<string, CardData> collectedCards = new Dictionary<string, CardData>();
+        
+        // Number of unopened booster packs the player has
+        [SerializeField] private int boosterPackCount;
+        
+        // Additional lookup dictionaries (not serialized)
+        [NonSerialized] private Dictionary<CardZone, List<CardData>> cardsByZone = new Dictionary<CardZone, List<CardData>>();
+        [NonSerialized] private Dictionary<CardRarity, List<CardData>> cardsByRarity = new Dictionary<CardRarity, List<CardData>>();
+        
+        // Properties with public getters
+        public Dictionary<string, CardData> CollectedCards => collectedCards;
+        
+        public int BoosterPackCount 
+        { 
+            get => boosterPackCount; 
+            set => boosterPackCount = value; 
+        }
+
+        // Constructor initializes empty dictionaries
+        public CardInventory()
+        {
+            // Initialize dictionaries for all enum values so we never have to check for null
+            foreach (CardZone zone in Enum.GetValues(typeof(CardZone)))
+            {
+                cardsByZone[zone] = new List<CardData>();
+            }
+            
+            foreach (CardRarity rarity in Enum.GetValues(typeof(CardRarity)))
+            {
+                cardsByRarity[rarity] = new List<CardData>();
+            }
+        }
+        
+        /// <summary>
+        /// Get all cards in the player's collection as a list
+        /// </summary>
+        public List<CardData> GetAllCards()
+        {
+            return new List<CardData>(collectedCards.Values);
+        }
+        
+        /// <summary>
+        /// Get cards filtered by zone
+        /// </summary>
+        public List<CardData> GetCardsByZone(CardZone zone)
+        {
+            return new List<CardData>(cardsByZone[zone]);
+        }
+        
+        /// <summary>
+        /// Get cards filtered by rarity
+        /// </summary>
+        public List<CardData> GetCardsByRarity(CardRarity rarity)
+        {
+            return new List<CardData>(cardsByRarity[rarity]);
+        }
+        
+        /// <summary>
+        /// Add a card to the inventory (or increase the copies if already owned)
+        /// </summary>
+        public void AddCard(CardData card)
+        {
+            if (card == null) return;
+            
+            if (collectedCards.TryGetValue(card.DefinitionId, out CardData existingCard))
+            {
+                // Increase copies of existing card
+                existingCard.CopiesOwned++;
+            }
+            else
+            {
+                // Add new card to collection
+                var newCard = new CardData(card);
+                collectedCards[card.DefinitionId] = newCard;
+                
+                // Add to lookup dictionaries
+                cardsByZone[newCard.Zone].Add(newCard);
+                cardsByRarity[newCard.Rarity].Add(newCard);
+            }
+        }
+        
+        /// <summary>
+        /// Update card zone and rarity indexes when a card changes
+        /// </summary>
+        public void UpdateCardProperties(CardData card, CardZone oldZone, CardRarity oldRarity)
+        {
+            // Only needed if the card's zone or rarity actually changed
+            if (oldZone != card.Zone)
+            {
+                cardsByZone[oldZone].Remove(card);
+                cardsByZone[card.Zone].Add(card);
+            }
+            
+            if (oldRarity != card.Rarity)
+            {
+                cardsByRarity[oldRarity].Remove(card);
+                cardsByRarity[card.Rarity].Add(card);
+            }
+        }
+        
+        /// <summary>
+        /// Get a specific card from the collection by definition ID
+        /// </summary>
+        public CardData GetCard(string definitionId)
+        {
+            return collectedCards.TryGetValue(definitionId, out CardData card) ? card : null;
+        }
+        
+        /// <summary>
+        /// Check if the player has a specific card
+        /// </summary>
+        public bool HasCard(string definitionId)
+        {
+            return collectedCards.ContainsKey(definitionId);
+        }
+        
+        /// <summary>
+        /// Get total number of unique cards in collection
+        /// </summary>
+        public int GetUniqueCardCount()
+        {
+            return collectedCards.Count;
+        }
+        
+        /// <summary>
+        /// Get total number of cards including copies
+        /// </summary>
+        public int GetTotalCardCount()
+        {
+            return collectedCards.Values.Sum(card => card.CopiesOwned);
+        }
+        
+        /// <summary>
+        /// Get number of cards in a specific zone
+        /// </summary>
+        public int GetZoneCardCount(CardZone zone)
+        {
+            return cardsByZone[zone].Count;
+        }
+        
+        /// <summary>
+        /// Get number of cards of a specific rarity
+        /// </summary>
+        public int GetRarityCardCount(CardRarity rarity)
+        {
+            return cardsByRarity[rarity].Count;
+        }
+        
+        /// <summary>
+        /// Get cards sorted by collection index (for album view)
+        /// </summary>
+        public List<CardData> GetCardsSortedByIndex()
+        {
+            return collectedCards.Values
+                .OrderBy(card => card.CollectionIndex)
+                .ToList();
+        }
+        
+        /// <summary>
+        /// Check if there's a complete collection for a specific zone
+        /// </summary>
+        public bool IsZoneCollectionComplete(CardZone zone, List<CardDefinition> allAvailableCards)
+        {
+            int availableInZone = allAvailableCards.Count(card => card.Zone == zone);
+            int collectedInZone = cardsByZone[zone].Count;
+            
+            return availableInZone > 0 && collectedInZone >= availableInZone;
+        }
+        
+        /// <summary>
+        /// Adds booster packs to the inventory
+        /// </summary>
+        public void AddBoosterPacks(int count)
+        {
+            boosterPackCount += count;
+        }
+        
+        /// <summary>
+        /// Use a single booster pack (returns true if successful)
+        /// </summary>
+        public bool UseBoosterPack()
+        {
+            if (boosterPackCount <= 0) return false;
+            
+            boosterPackCount--;
+            return true;
+        }
+    }
+}
diff --git a/Assets/Scripts/Data/CardSystem/CardInventory.cs.meta b/Assets/Scripts/Data/CardSystem/CardInventory.cs.meta
new file mode 100644
index 00000000..fecde4f8
--- /dev/null
+++ b/Assets/Scripts/Data/CardSystem/CardInventory.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: f5b1aa91590d48a1a4c426f3cd4aa103
+timeCreated: 1760445622
\ No newline at end of file
diff --git a/Assets/Scripts/Data/CardSystem/CardSystemManager.cs b/Assets/Scripts/Data/CardSystem/CardSystemManager.cs
index c80ed549..183b4e0d 100644
--- a/Assets/Scripts/Data/CardSystem/CardSystemManager.cs
+++ b/Assets/Scripts/Data/CardSystem/CardSystemManager.cs
@@ -1,8 +1,9 @@
 using System;
 using System.Collections.Generic;
+using AppleHills.Data.CardSystem;
 using UnityEngine;
 
-namespace AppleHills.Data.CardSystem
+namespace Data.CardSystem
 {
     /// <summary>
     /// Manages the player's card collection, booster packs, and related operations.
@@ -138,8 +139,9 @@ namespace AppleHills.Data.CardSystem
         private void AddCardToInventory(CardData card)
         {
             // Check if the player already has this card type (definition)
-            if (playerInventory.CollectedCards.TryGetValue(card.DefinitionId, out CardData existingCard))
+            if (playerInventory.HasCard(card.DefinitionId))
             {
+                CardData existingCard = playerInventory.GetCard(card.DefinitionId);
                 existingCard.CopiesOwned++;
                 
                 // Check if the card can be upgraded
@@ -153,7 +155,7 @@ namespace AppleHills.Data.CardSystem
             else
             {
                 // Add new card
-                playerInventory.CollectedCards.Add(card.DefinitionId, new CardData(card));
+                playerInventory.AddCard(card);
                 OnCardCollected?.Invoke(card);
                 
                 Debug.Log($"[CardSystemManager] Added new card '{card.Name}' to collection.");
@@ -227,12 +229,23 @@ namespace AppleHills.Data.CardSystem
         /// </summary>
         public List<CardData> GetAllCollectedCards()
         {
-            List<CardData> result = new List<CardData>();
-            foreach (var card in playerInventory.CollectedCards.Values)
-            {
-                result.Add(card);
-            }
-            return result;
+            return playerInventory.GetAllCards();
+        }
+        
+        /// <summary>
+        /// Returns cards from a specific zone
+        /// </summary>
+        public List<CardData> GetCardsByZone(CardZone zone)
+        {
+            return playerInventory.GetCardsByZone(zone);
+        }
+        
+        /// <summary>
+        /// Returns cards of a specific rarity
+        /// </summary>
+        public List<CardData> GetCardsByRarity(CardRarity rarity)
+        {
+            return playerInventory.GetCardsByRarity(rarity);
         }
         
         /// <summary>
@@ -248,17 +261,30 @@ namespace AppleHills.Data.CardSystem
         /// </summary>
         public bool IsCardCollected(string definitionId)
         {
-            return playerInventory.CollectedCards.ContainsKey(definitionId);
+            return playerInventory.HasCard(definitionId);
+        }
+        
+        /// <summary>
+        /// Gets total unique card count
+        /// </summary>
+        public int GetUniqueCardCount()
+        {
+            return playerInventory.GetUniqueCardCount();
+        }
+        
+        /// <summary>
+        /// Gets completion percentage for a specific zone (0-100)
+        /// </summary>
+        public float GetZoneCompletionPercentage(CardZone zone)
+        {
+            // Count available cards in this zone
+            int totalInZone = availableCards.FindAll(c => c.Zone == zone).Count;
+            if (totalInZone == 0) return 0;
+            
+            // Count collected cards in this zone
+            int collectedInZone = playerInventory.GetCardsByZone(zone).Count;
+            
+            return (float)collectedInZone / totalInZone * 100f;
         }
     }
-
-    /// <summary>
-    /// Serializable class to store the player's card inventory
-    /// </summary>
-    [Serializable]
-    public class CardInventory
-    {
-        public Dictionary<string, CardData> CollectedCards = new Dictionary<string, CardData>();
-        public int BoosterPackCount;
-    }
 }
diff --git a/Assets/Scripts/UI/CardSystem/AlbumViewPage.cs b/Assets/Scripts/UI/CardSystem/AlbumViewPage.cs
index 08bc1341..069cd840 100644
--- a/Assets/Scripts/UI/CardSystem/AlbumViewPage.cs
+++ b/Assets/Scripts/UI/CardSystem/AlbumViewPage.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using AppleHills.Data.CardSystem;
+using Data.CardSystem;
 using Pixelplacement;
 using UnityEngine;
 using UnityEngine.UI;
diff --git a/Assets/Scripts/UI/CardSystem/BoosterOpeningPage.cs b/Assets/Scripts/UI/CardSystem/BoosterOpeningPage.cs
index c2a009f5..56bd7668 100644
--- a/Assets/Scripts/UI/CardSystem/BoosterOpeningPage.cs
+++ b/Assets/Scripts/UI/CardSystem/BoosterOpeningPage.cs
@@ -1,6 +1,7 @@
 using System.Collections;
 using System.Collections.Generic;
 using AppleHills.Data.CardSystem;
+using Data.CardSystem;
 using Pixelplacement;
 using UnityEngine;
 using UnityEngine.UI;
diff --git a/Assets/Scripts/UI/CardSystem/CardAlbumUI.cs b/Assets/Scripts/UI/CardSystem/CardAlbumUI.cs
index 28ef9a36..79d60628 100644
--- a/Assets/Scripts/UI/CardSystem/CardAlbumUI.cs
+++ b/Assets/Scripts/UI/CardSystem/CardAlbumUI.cs
@@ -1,5 +1,6 @@
 using System;
 using AppleHills.Data.CardSystem;
+using Data.CardSystem;
 using UnityEngine;
 using UnityEngine.UI;
 
diff --git a/Assets/Scripts/UI/CardSystem/CardMenuPage.cs b/Assets/Scripts/UI/CardSystem/CardMenuPage.cs
index 83ce4a95..85a7683f 100644
--- a/Assets/Scripts/UI/CardSystem/CardMenuPage.cs
+++ b/Assets/Scripts/UI/CardSystem/CardMenuPage.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using AppleHills.Data.CardSystem;
+using Data.CardSystem;
 using Pixelplacement;
 using UnityEngine;
 using UnityEngine.UI;
diff --git a/docs/card_system_implementation_plan.md b/docs/card_system_implementation_plan.md
new file mode 100644
index 00000000..b60bbe14
--- /dev/null
+++ b/docs/card_system_implementation_plan.md
@@ -0,0 +1,132 @@
+# Card System Implementation Plan
+
+## Current Implementation Analysis
+
+### Data Layer
+
+1. **CardData.cs**:
+   - Represents an instance of a card in the player's collection
+   - Contains unique ID, rarity, and copies owned
+   - Has a reference to its CardDefinition for display information
+   - Includes methods for rarity upgrades when collecting duplicates
+   - Well-structured with proper serialization support
+
+2. **CardDefinition.cs**:
+   - ScriptableObject template for creating card instances
+   - Contains basic info (name, description), visuals, and collection data
+   - Provides helper methods like CreateCardData() and GetBackgroundColor()
+   - Supports different zones (AppleHills, Quarry, Forest, Mountain, Beach)
+
+3. **CardSystemManager.cs**:
+   - Singleton manager for the card system
+   - Manages available card definitions and player inventory
+   - Includes event callbacks for booster packs and card collection
+   - Has partial implementation for adding booster packs
+   - Has a simple CardInventory class stub
+
+4. **CardVisualConfig.cs**:
+   - ScriptableObject for configuring the visual appearance of cards
+   - Maps rarities to colors and zones to colors/shapes
+   - Uses dictionary lookups for efficient access
+
+### UI Layer
+
+1. **CardUIElement.cs**:
+   - Handles displaying a single card in the UI
+   - Updates visuals based on card data (rarity, zone)
+   - References UI elements like card name text, images, frames, etc.
+
+2. **UIPageController.cs**:
+   - Manages UI page transitions with a stack-based navigation system
+   - Provides methods for pushing, popping, and clearing the page stack
+   - Uses events to notify when pages change
+
+3. **UI Page Components**:
+   - Several page-related files (AlbumViewPage.cs, BoosterOpeningPage.cs, CardMenuPage.cs)
+   - CardAlbumUI.cs file for handling the album display
+   - Base UIPage.cs class for common page functionality
+
+## What's Missing
+
+Based on the requirements, here's what still needs to be implemented:
+
+1. **Complete CardInventory Implementation**:
+   - Move from simple stub to full implementation
+   - Add methods to manage the player's card collection
+   - Implement filtering, sorting, and organization features
+
+2. **Booster Pack Generation**:
+   - Complete the logic to generate random booster packs with appropriate rarity distribution
+   - Implement methods for awarding booster packs to the player
+   - Add events for notifying UI when booster packs are obtained
+
+3. **Card Collection UI**:
+   - Complete the album browsing UI with filtering and sorting options
+   - Implement visual indicators for owned/not owned cards
+   - Add UI for tracking collection completion
+
+4. **Booster Pack Opening UI**:
+   - Implement the UI flow for opening booster packs
+   - Add card reveal animations and effects
+   - Create UI feedback for rare card discoveries
+
+5. **Save/Load System**:
+   - Implement persistence for the player's card collection
+   - Add autosave functionality for cards and booster packs
+
+## Implementation Plan
+
+### Step 1: Complete the Data Layer
+
+1. **Implement CardInventory.cs**:
+   - Create a dedicated class file (replacing the stub in CardSystemManager)
+   - Add methods for adding/removing cards, checking duplicates
+   - Implement filtering by zone, rarity, etc.
+   - Add collection statistics methods
+
+2. **Complete CardSystemManager.cs**:
+   - Update references to use the new CardInventory class
+   - Add methods for save/load integration
+   - Implement additional helper methods for card management
+
+### Step 2: Implement UI Flow
+
+1. **Complete UIPage Implementations**:
+   - Implement CardMenuPage.cs as the main card system entry point
+   - Complete AlbumViewPage.cs for browsing the collection
+   - Implement BoosterOpeningPage.cs for the pack opening experience
+
+2. **Card Collection Browsing**:
+   - Complete CardAlbumUI.cs to display the player's collection
+   - Add filtering by zone, rarity, etc.
+   - Implement pagination for large collections
+
+3. **Booster Pack UI**:
+   - Create UI for displaying and opening booster packs
+   - Implement card reveal animations and transitions
+   - Add sound effects and visual feedback
+
+### Step 3: Integration and Polishing
+
+1. **Connect UI to Data Layer**:
+   - Hook up UI components to CardSystemManager events
+   - Ensure data flows correctly between UI and data layers
+
+2. **Test and Balance**:
+   - Test rarity distribution in booster packs
+   - Balance the upgrade system for duplicates
+
+3. **Performance Optimization**:
+   - Implement object pooling for card UI elements
+   - Optimize loading of card data and sprites
+
+### Step 4: Additional Features (Optional)
+
+1. **Card Trading System**:
+   - Allow players to trade cards with NPCs or other players
+   
+2. **Special Collection Bonuses**:
+   - Rewards for completing sets of cards
+
+3. **Card Usage Mechanics**:
+   - Ways to use cards in gameplay beyond collection