Refactor, cleanup code and add documentaiton

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Assets/Scripts/UI/CardSystem/SlotContainerHelper.cs

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- using System.Collections.Generic;
- using Core;
- using UI.DragAndDrop.Core;
-using UnityEngine;
-
-namespace UI.CardSystem
-{
-    /// <summary>
-    /// Helper utility for shuffling draggable objects in a SlotContainer.
-    /// Moves objects to occupy the first available slots (0, 1, 2, etc.)
-    /// </summary>
-    public static class SlotContainerHelper
-    {
-        /// <summary>
-        /// Shuffles draggable objects to always occupy the first available slots.
-        /// Unassigns all objects from their current slots, then reassigns them starting from slot 0.
-        /// </summary>
-        /// <param name="container">The slot container holding the slots</param>
-        /// <param name="objects">List of draggable objects to shuffle</param>
-        /// <param name="animate">Whether to animate the movement</param>
-        public static void ShuffleToFront(SlotContainer container, List<DraggableObject> objects, bool animate = true)
-        {
-            if (container == null || objects == null || objects.Count == 0)
-                return;
-            
-            Logging.Debug($"[SlotContainerHelper] Shuffling {objects.Count} objects to front slots");
-            
-            // Unassign all objects from their current slots
-            foreach (var obj in objects)
-            {
-                if (obj.CurrentSlot != null)
-                {
-                    obj.CurrentSlot.Vacate();
-                }
-            }
-            
-            // Reassign objects to first N slots starting from slot 0
-            for (int i = 0; i < objects.Count; i++)
-            {
-                DraggableSlot targetSlot = FindSlotByIndex(container, i);
-                DraggableObject obj = objects[i];
-                
-                if (targetSlot != null)
-                {
-                    Logging.Debug($"[SlotContainerHelper] Assigning object to slot with SlotIndex {i}");
-                    obj.AssignToSlot(targetSlot, animate);
-                }
-                else
-                {
-                    Logging.Warning($"[SlotContainerHelper] Could not find slot with SlotIndex {i}");
-                }
-            }
-        }
-        
-        /// <summary>
-        /// Find a slot by its SlotIndex property (not list position)
-        /// </summary>
-        private static DraggableSlot FindSlotByIndex(SlotContainer container, int slotIndex)
-        {
-            foreach (var slot in container.Slots)
-            {
-                if (slot.SlotIndex == slotIndex)
-                {
-                    return slot;
-                }
-            }
-            return null;
-        }
-    }
-}
-

Assets/Scripts/UI/CardSystem/SlotContainerHelper.cs.meta

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docs/album_placement_flow_proposal.md

@@ -1,460 +0,0 @@
-# Album Card Placement Flow - Refactored Design
-
-## Current State Analysis
-
-### Existing Flow (Pre-Refactor):
-1. Pending cards spawn face-up in bottom-right slots
-2. User drags card to album slot
-3. Card placement triggers inventory move
-4. Next card spawns
-
-### Problems:
-- Cards spawn face-up (should be face-down)
-- No "smart selection" from pending queue based on current album page
-- No auto-flip to correct album page when card is picked up
-- States don't support "hold to reveal" behavior
-
----
-
-## Proposed New Flow
-
-### Visual Journey:
-```
-[Face-Down Card in Corner] 
-    ↓ (user holds/drags)
-[Card Flips to Reveal] + [Album auto-flips to correct page]
-    ↓ (user drags over album)
-[Card hovers over slot]
-    ↓ (user releases)
-[Card snaps to slot] → [Revealed State in slot]
-```
-
-### Technical Implementation:
-
----
-
-## 1. New Card States
-
-### A. `CardPendingFaceDownState`
-**Purpose:** Initial state for cards in pending corner slots
-**Visuals:** 
-- Card back visible (card front hidden)
-- Small scale (to fit in corner slot)
-- Idle in corner
-
-**Behavior:**
-- Does NOT respond to clicks
-- Responds to drag start (OnDragStarted)
-- On drag start → trigger smart card selection + flip animation
-
-**Transitions:**
-- OnDragStarted → `CardFlippingPendingState`
-
----
-
-### B. `CardFlippingPendingState`
-**Purpose:** Transition state while card flips and album navigates
-**Visuals:**
-- Flip animation (card back → card front)
-- Card follows cursor during flip
-
-**Behavior:**
-- Play flip animation (uses CardAnimator.PlayFlip)
-- Emit event to AlbumViewPage to navigate to card's page
-- Wait for flip animation complete
-
-**Transitions:**
-- OnFlipComplete → `CardDraggingRevealedState`
-
----
-
-### C. `CardDraggingRevealedState`
-**Purpose:** Card is revealed and being dragged around album
-**Visuals:**
-- Card front visible
-- No badges (clean revealed state)
-- Follow cursor/drag position
-- Slight scale-up while dragging
-
-**Behavior:**
-- Respond to drag position updates
-- Detect when hovering over valid AlbumCardSlot
-- Visual feedback when over valid slot
-- On drag end → snap to slot if valid, otherwise return to corner
-
-**Transitions:**
-- OnDragEnd (over valid slot) → slot's `PlacedInSlotState`
-- OnDragEnd (invalid) → `CardPendingFaceDownState` (return to corner, flip back)
-
----
-
-## 2. Smart Card Selection System
-
-### AlbumViewPage Responsibilities:
-
-```csharp
-public class AlbumViewPage
-{
-    private List<CardData> _pendingQueue; // All pending cards
-    private List<Card> _cornerCards; // 3 face-down card GameObjects in corner
-    private int _currentAlbumPageIndex;
-    
-    /// <summary>
-    /// When user starts dragging ANY corner card, we pick which pending card to reveal
-    /// </summary>
-    private void OnCornerCardDragStarted(Card cornerCard)
-    {
-        // 1. Get current album page's expected cards
-        var currentPageSlots = GetSlotsOnCurrentPage();
-        var currentPageDefinitions = currentPageSlots
-            .Select(slot => slot.TargetCardDefinition)
-            .ToList();
-        
-        // 2. Try to find a pending card that belongs on this page
-        CardData selectedCard = _pendingQueue.FirstOrDefault(card => 
-            currentPageDefinitions.Any(def => def.Id == card.DefinitionId && def.Rarity == card.Rarity)
-        );
-        
-        // 3. If none on current page, pick random pending
-        if (selectedCard == null)
-        {
-            selectedCard = _pendingQueue[Random.Range(0, _pendingQueue.Count)];
-            
-            // Navigate album to the page where this card belongs
-            int targetPage = FindPageForCard(selectedCard);
-            NavigateToPage(targetPage);
-        }
-        
-        // 4. Assign the selected card data to the corner card being dragged
-        cornerCard.Context.SetupCard(selectedCard);
-        
-        // 5. Trigger flip (handled by state)
-        cornerCard.Context.StateMachine.ChangeState("FlippingPendingState");
-    }
-}
-```
-
----
-
-## 3. Card.cs Extensions
-
-### New Setup Method:
-```csharp
-public class Card
-{
-    /// <summary>
-    /// Setup for album pending placement (starts face-down in corner)
-    /// </summary>
-    public void SetupForAlbumPending()
-    {
-        // Start with NO card data (will be assigned on drag)
-        SetupCard(null, "PendingFaceDownState");
-        SetDraggingEnabled(true); // Enable drag immediately
-    }
-}
-```
-
-### Drag Event Routing:
-```csharp
-// In Card.cs
-public event Action<Card> OnDragStartedEvent;
-
-private void OnDragStarted()
-{
-    OnDragStartedEvent?.Invoke(this);
-}
-```
-
----
-
-## 4. AlbumViewPage Modifications
-
-### Spawn Pending Cards (Face-Down):
-```csharp
-private void SpawnPendingCards()
-{
-    // Spawn up to 3 "blank" face-down cards in corner
-    for (int i = 0; i < MAX_VISIBLE_CARDS; i++)
-    {
-        GameObject cardObj = Instantiate(cardPrefab, bottomRightSlots.transform);
-        var card = cardObj.GetComponent<StateMachine.Card>();
-        
-        if (card != null)
-        {
-            // Setup as pending (no data yet, face-down)
-            card.SetupForAlbumPending();
-            
-            // Subscribe to drag start
-            card.OnDragStartedEvent += OnCornerCardDragStarted;
-            
-            // Assign to corner slot
-            DraggableSlot slot = FindSlotByIndex(i);
-            card.AssignToSlot(slot, true);
-            
-            _cornerCards.Add(card);
-        }
-    }
-}
-```
-
-### Handle Drag Start (Smart Selection):
-```csharp
-private void OnCornerCardDragStarted(Card cornerCard)
-{
-    if (_pendingQueue.Count == 0) return;
-    
-    // Smart selection logic (from section 2)
-    CardData selectedCard = SelectSmartPendingCard();
-    
-    // Assign data to the dragged corner card
-    cornerCard.Context.SetupCard(selectedCard);
-    
-    // State transition to flipping (handled by state machine)
-    // FlippingPendingState will trigger flip animation + album navigation
-}
-```
-
-### Navigate to Card's Page:
-```csharp
-public void NavigateToCardPage(CardData card)
-{
-    int targetPage = FindPageForCard(card);
-    if (targetPage != _currentAlbumPageIndex)
-    {
-        // Trigger book page flip animation
-        bookController.FlipToPage(targetPage);
-    }
-}
-```
-
----
-
-## 5. State Implementation Details
-
-### CardPendingFaceDownState.cs
-```csharp
-public class CardPendingFaceDownState : AppleState
-{
-    private CardContext _context;
-    
-    public override void OnEnterState()
-    {
-        // Show card back, hide card front
-        if (_context.CardDisplay != null)
-        {
-            _context.CardDisplay.gameObject.SetActive(false); // Hide front
-        }
-        
-        var cardBack = GetComponentInChildren<CardBack>(); // Assumes CardBack component exists
-        if (cardBack != null)
-        {
-            cardBack.gameObject.SetActive(true);
-        }
-        
-        // Small scale for corner slot
-        _context.RootTransform.localScale = Vector3.one * 0.8f;
-    }
-}
-```
-
-### CardFlippingPendingState.cs
-```csharp
-public class CardFlippingPendingState : AppleState
-{
-    private CardContext _context;
-    
-    public override void OnEnterState()
-    {
-        // Notify album page to navigate
-        var albumPage = FindObjectOfType<AlbumViewPage>();
-        if (albumPage != null)
-        {
-            albumPage.NavigateToCardPage(_context.CardData);
-        }
-        
-        // Play flip animation
-        if (_context.Animator != null)
-        {
-            _context.Animator.PlayFlip(
-                startRotation: Quaternion.Euler(0, 180, 0), // back facing
-                endRotation: Quaternion.identity,           // front facing
-                onComplete: OnFlipComplete
-            );
-        }
-    }
-    
-    private void OnFlipComplete()
-    {
-        _context.StateMachine.ChangeState("DraggingRevealedState");
-    }
-}
-```
-
-### CardDraggingRevealedState.cs
-```csharp
-public class CardDraggingRevealedState : AppleState
-{
-    private CardContext _context;
-    private AlbumCardSlot _hoveredSlot;
-    
-    public override void OnEnterState()
-    {
-        // Card front visible, clean revealed (no badges)
-        if (_context.CardDisplay != null)
-        {
-            _context.CardDisplay.gameObject.SetActive(true);
-        }
-        
-        // Slightly larger while dragging
-        _context.Animator.PlayEnlarge(1.2f);
-    }
-    
-    void Update()
-    {
-        // Detect hover over valid album slots
-        _hoveredSlot = DetectValidSlotUnderCursor();
-        
-        if (_hoveredSlot != null)
-        {
-            // Visual feedback: highlight slot or card
-        }
-    }
-    
-    public void OnDragEnded()
-    {
-        if (_hoveredSlot != null && _hoveredSlot.CanAcceptCard(_context.CardData))
-        {
-            // Snap to slot and transition to PlacedInSlotState
-            SnapToSlot(_hoveredSlot);
-        }
-        else
-        {
-            // Return to corner, flip back to face-down
-            ReturnToCorner();
-        }
-    }
-}
-```
-
----
-
-## 6. Required New Components
-
-### CardBack Component
-```csharp
-public class CardBack : MonoBehaviour
-{
-    [SerializeField] private Image backImage;
-    
-    public void Show() => gameObject.SetActive(true);
-    public void Hide() => gameObject.SetActive(false);
-}
-```
-
-Attach to Card prefab as a sibling to CardDisplay.
-
----
-
-## 7. Prefab Structure
-
-```
-Card (GameObject)
-├── StateMachine (AppleMachine)
-│   ├── PendingFaceDownState
-│   ├── FlippingPendingState
-│   ├── DraggingRevealedState
-│   ├── PlacedInSlotState (existing)
-│   └── ... (other states)
-├── CardContext
-├── CardAnimator
-├── CardDisplay (front visuals)
-├── CardBack (back visuals - NEW)
-└── DraggableObject
-```
-
----
-
-## 8. Migration Steps
-
-### Step 1: Create New States
-- CardPendingFaceDownState.cs
-- CardFlippingPendingState.cs
-- CardDraggingRevealedState.cs
-
-### Step 2: Add CardBack Component
-- Create CardBack.cs script
-- Add CardBack GameObject to Card prefab
-- Design card back visual (sprite, frame, etc.)
-
-### Step 3: Update Card.cs
-- Add SetupForAlbumPending() method
-- Add OnDragStartedEvent
-- Wire drag events to state machine
-
-### Step 4: Update AlbumViewPage
-- Modify SpawnPendingCards() to spawn face-down
-- Implement smart selection logic
-- Add NavigateToCardPage() method
-- Connect to book flip controller
-
-### Step 5: Update CardAnimator
-- Ensure PlayFlip() can handle arbitrary start/end rotations
-- Add any needed drag-follow animation helpers
-
-### Step 6: Testing
-- Test corner card drag → flip → album navigation
-- Test smart selection (page match prioritization)
-- Test return-to-corner on invalid drop
-- Test snap-to-slot on valid drop
-- Test multiple cards in queue
-
----
-
-## 9. Edge Cases & Considerations
-
-### No Pending Cards
-- Don't spawn corner cards if pending queue is empty
-- Hide corner slots when no cards to place
-
-### Album Page Navigation During Drag
-- Lock page flipping while dragging (prevent user manual flip)
-- Queue navigation if flip animation in progress
-
-### Multiple Cards Dragged Simultaneously
-- Only allow one card to be in FlippingPending/DraggingRevealed at a time
-- Disable other corner cards while one is being dragged
-
-### Card Returns to Corner
-- Flip back animation (reverse of reveal)
-- Re-enter PendingFaceDownState
-- Unassign CardData (become "blank" again for next drag)
-
-### Invalid Slot Drop
-- Visual feedback (shake, red highlight)
-- Smooth return animation to corner
-
----
-
-## 10. Benefits of This Approach
-
-✅ **Consistent State Architecture** - Uses same state machine pattern as booster flow  
-✅ **Smart UX** - Auto-navigation to correct album page  
-✅ **Clean Separation** - States handle visuals/behavior, page handles logic  
-✅ **Reusable** - States can be reused for other card flows  
-✅ **Extensible** - Easy to add new behaviors (e.g., card preview on hover)  
-✅ **Testable** - Each state can be tested independently  
-
----
-
-## Open Questions for Approval
-
-1. **Card Back Design:** Should we use a generic back for all cards, or rarity-specific backs?
-2. **Navigation Timing:** Should album flip happen instantly or animated during card flip?
-3. **Return Animation:** Fast snap-back or gentle float-back when invalid drop?
-4. **Multiple Rarities:** If pending queue has same card at multiple rarities, which to prioritize?
-5. **Corner Slot Count:** Keep at 3, or make configurable?
-
----
-
-Ready to implement once approved! 🎉
-

docs/card_system_guide.md

@@ -0,0 +1,674 @@
+# Card System Guide
+
+Complete guide to the Apple Hills card collecting and album system.
+
+## Table of Contents
+- [Overview](#overview)
+- [Quick Start](#quick-start)
+- [System Architecture](#system-architecture)
+- [Card Flows](#card-flows)
+- [Key Components](#key-components)
+- [Working with Cards in Code](#working-with-cards-in-code)
+- [Extending the System](#extending-the-system)
+- [Troubleshooting](#troubleshooting)
+
+---
+
+## Overview
+
+The Card System manages the player's collectible card journey from booster pack opening to album placement. It consists of:
+
+- **Booster Opening Flow**: Interactive pack opening with card reveals
+- **Album Placement Flow**: Drag-and-drop cards into album slots
+- **State Machine**: Each card progresses through well-defined states
+- **Album Navigation**: Book-based album with zone tabs
+- **Notification System**: Visual feedback for new boosters/pending cards
+
+### Core Concepts
+
+**CardData**: Runtime data for a single card (definition ID, rarity, zone, image)
+**CardDefinition**: ScriptableObject template defining card properties
+**Card States**: Cards transition through states (Idle → Revealed → Dragging → Placed)
+**Pending Cards**: Cards waiting to be placed in the album (shown in bottom-right corner)
+
+---
+
+## Quick Start
+
+### Opening the Album
+
+```csharp
+// From any script
+if (UIPageController.Instance != null)
+{
+    UIPageController.Instance.PushPage(albumViewPage);
+}
+```
+
+### Granting Booster Packs
+
+```csharp
+// Simple API
+CardSystemManager.Instance.AddBoosterPack(1);
+
+// Visual grant with animation (from minigames)
+MinigameBoosterGiver.Instance.GiveBooster(() => {
+    Debug.Log("Booster granted and animation complete!");
+});
+```
+
+### Opening a Booster Pack (Programmatic)
+
+```csharp
+// Returns list of cards in the pack
+List<CardData> cards = CardSystemManager.Instance.OpenBoosterPack();
+
+// The cards are automatically added to "pending" state
+// Player must place them in album manually
+```
+
+### Checking Player's Collection
+
+```csharp
+var inventory = CardSystemManager.Instance.GetCardInventory();
+
+// Check if player owns a specific card
+CardData ownedCard = inventory.GetCard("CardDefID", CardRarity.Legendary);
+
+// Get all cards in a zone
+List<CardData> townCards = inventory.GetCardsByZone(CardZone.Town);
+
+// Check completion percentage
+float completion = inventory.GetCompletionPercentage();
+```
+
+---
+
+## System Architecture
+
+### Component Hierarchy
+
+```
+CardSystemManager (Singleton)
+├── Inventory Management
+├── Booster Pack Logic
+└── Pending Card Queue
+
+AlbumViewPage (UI Page)
+├── CornerCardManager (Non-Component)
+│   └── Manages 3 pending cards in corner
+├── AlbumNavigationService (Non-Component)
+│   └── Book page flipping & zone navigation
+└── CardEnlargeController (Non-Component)
+    └── Backdrop & enlarge/shrink animations
+
+BoosterOpeningPage (UI Page)
+└── Manages pack opening flow & card reveals
+
+Card (MonoBehaviour)
+├── CardContext (shared state)
+├── CardAnimator (animations)
+├── CardDisplay (visuals)
+└── StateMachine (10 possible states)
+```
+
+### Non-Component Controllers
+
+The system uses **Controller** pattern for complex logic without Unity lifecycle overhead:
+
+- **CornerCardManager**: Spawns/despawns pending cards, smart selection, shuffle logic
+- **AlbumNavigationService**: Book page navigation, zone mapping
+- **CardEnlargeController**: Backdrop visibility, card reparenting for enlarge view
+- **ProgressBarController**: Booster opening progress visualization
+
+These are instantiated lazily via C# properties:
+```csharp
+private CornerCardManager _cornerCardManager;
+private CornerCardManager CornerCards => _cornerCardManager ??= new CornerCardManager(...);
+```
+
+---
+
+## Card Flows
+
+### 1. Booster Opening Flow
+
+```
+Player opens booster pack
+  ↓
+BoosterOpeningPage spawns cards face-down
+  ↓
+Player clicks a card (IdleState → EnlargedNewState/EnlargedRepeatState)
+  ↓
+Card flips & enlarges, shows NEW or REPEAT badge
+  ↓
+Player clicks to dismiss (→ RevealedState)
+  ↓
+Repeat until all cards revealed
+  ↓
+Cards fly to album icon, added to pending queue
+  ↓
+Page auto-closes (or waits for player)
+```
+
+**Key States:**
+- **IdleState**: Face-down, awaiting click
+- **EnlargedNewState**: NEW badge (first time collection)
+- **EnlargedRepeatState**: REPEAT badge (duplicate)
+- **EnlargedLegendaryRepeatState**: Special legendary repeat state
+- **RevealedState**: Face-up, dismissed from center
+
+### 2. Album Placement Flow
+
+```
+AlbumViewPage opens
+  ↓
+CornerCardManager spawns up to 3 pending cards (face-down)
+  ↓
+Player drags card (PendingFaceDownState → DraggingRevealedState)
+  ↓
+Card data assigned, flips to reveal, book navigates to correct zone page
+  ↓
+Player drops card on matching AlbumCardSlot
+  ↓
+Card placed (→ PlacedInSlotState), registered with AlbumViewPage
+  ↓
+CornerCardManager rebuilds: shuffles remaining cards, spawns new if available
+```
+
+**Key States:**
+- **PendingFaceDownState**: Face-down in corner, no data assigned yet
+- **DraggingRevealedState**: Data assigned, flipped, dragging to slot
+- **PlacedInSlotState**: Locked in album slot
+- **AlbumEnlargedState**: Clicked from slot, enlarged for viewing
+
+### 3. Album Card Viewing
+
+```
+Player clicks placed card in album slot
+  ↓
+Card enlarges (PlacedInSlotState → AlbumEnlargedState)
+  ↓
+Backdrop shown, card reparented to enlarged container
+  ↓
+Card animates to center with dramatic scale increase
+  ↓
+Player clicks card or backdrop to dismiss
+  ↓
+Card shrinks & animates back to slot (→ PlacedInSlotState)
+  ↓
+Backdrop hidden, card reparented back to slot
+```
+
+---
+
+## Key Components
+
+### CardSystemManager
+
+**Singleton** managing all card data and inventory.
+
+```csharp
+// Access
+CardSystemManager.Instance
+
+// Key Methods
+.AddBoosterPack(int count)           // Grant booster packs
+.OpenBoosterPack()                   // Open a pack, returns CardData[]
+.GetPendingRevealCards()             // Get cards waiting for album placement
+.GetCardInventory()                  // Access player's collection
+.AddCardToInventory(CardData)        // Add card to collection
+.RemoveFromPending(CardData)         // Remove from pending queue
+
+// Events
+.OnBoosterCountChanged(int newCount)
+.OnPendingCardAdded(CardData)
+.OnPendingCardRemoved(CardData)
+```
+
+### AlbumViewPage
+
+**UI Page** for viewing and managing the album.
+
+```csharp
+// Setup in scene:
+// - Assign book reference (BookPro component)
+// - Assign zone tab container
+// - Assign card prefab for spawning
+// - Assign backdrop & enlarged container for card viewing
+// - Link to BoosterOpeningPage
+
+// Query Methods (used by Card states)
+public CardData GetCardForPendingSlot()           // Smart card selection
+public AlbumCardSlot GetTargetSlotForCard(CardData) // Find destination slot
+public void NavigateToCardPage(CardData, Action)   // Flip to correct page
+public void NotifyCardPlaced(Card)                 // Cleanup after placement
+
+// Public Properties
+public bool IsPageFlipping                         // For state timing checks
+```
+
+### BoosterOpeningPage
+
+**UI Page** for opening booster packs.
+
+```csharp
+// Setup in scene:
+// - Assign booster pack prefab
+// - Assign corner slots for waiting boosters (max 3)
+// - Assign center slot for opening
+// - Assign card display container
+// - Assign card prefab
+// - Assign album icon (dismiss button & tween target)
+
+// Call before showing:
+.SetAvailableBoosterCount(int count)  // How many boosters player has
+
+// Flow automatically managed by page
+```
+
+### Card States
+
+Each card uses **AppleMachine** state machine with these states:
+
+| State | Purpose | Entry Trigger |
+|-------|---------|---------------|
+| **IdleState** | Face-down in booster opening | Card spawned for booster reveal |
+| **EnlargedNewState** | Enlarged with NEW badge | Clicked first-time card |
+| **EnlargedRepeatState** | Enlarged with REPEAT badge | Clicked duplicate |
+| **EnlargedLegendaryRepeatState** | Legendary repeat variant | Clicked legendary duplicate |
+| **RevealedState** | Face-up, dismissed | Dismissed from enlarged state |
+| **PendingFaceDownState** | Face-down in corner | Spawned in album corner |
+| **DraggingRevealedState** | Face-up while dragging | Dragged from corner |
+| **PlacedInSlotState** | Locked in album slot | Dropped on correct slot |
+| **AlbumEnlargedState** | Enlarged from album | Clicked while in slot |
+| **DraggingState** | Generic drag state | *(unused in current flow)* |
+
+### Card Context & Components
+
+Every card has:
+- **CardContext**: Shared state, component references, events
+- **CardAnimator**: Centralized animation methods
+- **CardDisplay**: Visual rendering (image, frame, overlay, rarity/zone styling)
+- **AppleMachine**: State machine controller
+
+```csharp
+// Accessing card components
+var card = GetComponent<Card>();
+card.Context.CardData           // CardData
+card.Context.Animator           // CardAnimator
+card.Context.CardDisplay        // CardDisplay
+card.Context.StateMachine       // AppleMachine
+card.Context.AlbumViewPage      // Injected page reference
+```
+
+---
+
+## Working with Cards in Code
+
+### Spawning a Card for Booster Opening
+
+```csharp
+GameObject cardObj = Instantiate(cardPrefab, containerTransform);
+var card = cardObj.GetComponent<Card>();
+var context = cardObj.GetComponent<CardContext>();
+
+// Setup card data
+context.SetupCard(cardData);
+
+// Start in IdleState for booster reveal
+card.SetupForBoosterReveal(cardData, isNew);  // isNew unused, states query inventory
+
+// Subscribe to reveal complete event
+context.BoosterContext.OnRevealFlowComplete += () => {
+    Debug.Log("Card reveal finished!");
+};
+```
+
+### Spawning a Card for Album Corner
+
+```csharp
+GameObject cardObj = Instantiate(cardPrefab, slotTransform);
+var card = cardObj.GetComponent<Card>();
+
+// Assign to slot FIRST
+card.AssignToSlot(slot, animateMove: false);
+
+// Inject AlbumViewPage dependency
+card.Context.SetAlbumViewPage(albumViewPage);
+
+// Setup for pending state (no data yet)
+card.SetupForAlbumPending();  // Starts in PendingFaceDownState
+```
+
+### Spawning a Card Already in Album Slot
+
+```csharp
+GameObject cardObj = Instantiate(cardPrefab, slotTransform);
+var card = cardObj.GetComponent<Card>();
+
+// Setup for album slot (already owned)
+card.SetupForAlbumSlot(cardData, albumCardSlot);  // Starts in PlacedInSlotState
+
+// Register for enlarge/shrink functionality
+albumViewPage.RegisterCardInAlbum(card);
+```
+
+### Transitioning Card States Manually
+
+```csharp
+// Get card component
+var card = GetComponent<Card>();
+
+// Change state
+card.ChangeState(CardStateNames.Revealed);
+
+// Check current state
+string currentState = card.GetCurrentStateName();
+if (currentState == CardStateNames.PlacedInSlot)
+{
+    Debug.Log("Card is placed in album!");
+}
+
+// Get specific state component
+var enlargedState = card.GetStateComponent<CardAlbumEnlargedState>(
+    CardStateNames.AlbumEnlarged
+);
+if (enlargedState != null)
+{
+    // Access state-specific methods/properties
+}
+```
+
+### Subscribing to Card Events
+
+```csharp
+var context = card.Context;
+
+// Drag events
+context.OnDragStarted += (ctx) => Debug.Log("Drag started!");
+context.OnDragEnded += (ctx) => Debug.Log("Drag ended!");
+
+// Click events (routed through CardDisplay)
+context.CardDisplay.OnCardClicked += (display) => Debug.Log("Card clicked!");
+
+// Booster reveal events
+context.BoosterContext.OnRevealFlowComplete += () => {
+    Debug.Log("Reveal complete!");
+    CardSystemManager.Instance.AddCardToInventory(context.CardData);
+};
+
+// State machine events (if needed)
+context.StateMachine.OnStateChange += (newState) => Debug.Log($"State: {newState.name}");
+```
+
+### Custom Animations
+
+```csharp
+var animator = card.Animator;
+
+// Built-in animations
+animator.PopIn(duration: 0.5f, onComplete: () => Debug.Log("Popped in!"));
+animator.PopOut(duration: 0.3f);
+animator.PlayEnlarge(targetScale: 2.5f);
+animator.PlayShrink(targetScale: Vector3.one);
+
+// Combine animations
+animator.AnimateLocalPosition(Vector3.zero, duration: 0.5f);
+animator.AnimateScale(Vector3.one * 1.5f, duration: 0.3f);
+
+// Flip animation
+Transform cardBack = card.transform.Find("CardBack");
+Transform cardFront = card.transform.Find("CardDisplay");
+animator.PlayFlip(cardBack, cardFront, duration: 0.6f, onComplete: () => {
+    Debug.Log("Flip complete!");
+});
+animator.PlayFlipScalePunch(punchScale: 1.1f);
+
+// Hover effects
+Vector2 originalPos = animator.GetAnchoredPosition();
+animator.HoverEnter(liftAmount: 20f, scaleMultiplier: 1.05f);
+// ... later
+animator.HoverExit(originalPos);
+```
+
+---
+
+## Extending the System
+
+### Adding a New Card State
+
+1. **Create State Script** in `StateMachine/States/`
+   ```csharp
+   using Core.SaveLoad;
+   using UI.CardSystem.StateMachine;
+
+   public class MyNewCardState : AppleState, ICardClickHandler
+   {
+       private CardContext _context;
+       
+       public override void EnterState()
+       {
+           _context = GetComponentInParent<CardContext>();
+           // Setup animations, visuals, etc.
+       }
+       
+       public void OnCardClicked(CardContext context)
+       {
+           // Handle click behavior
+       }
+       
+       public override void ExitState()
+       {
+           // Cleanup
+       }
+   }
+   ```
+
+2. **Add State Name** to `CardStateNames.cs`
+   ```csharp
+   public const string MyNewState = "MyNewCardState";
+   ```
+
+3. **Add GameObject** as child of Card prefab's AppleMachine with your state component attached
+
+4. **Transition to State**
+   ```csharp
+   card.ChangeState(CardStateNames.MyNewState);
+   ```
+
+### Creating a Custom Card Visual Effect
+
+```csharp
+public class MyCardEffect : MonoBehaviour
+{
+    private CardContext _context;
+    
+    void Start()
+    {
+        _context = GetComponentInParent<CardContext>();
+        
+        // Subscribe to state changes
+        _context.StateMachine.OnStateChange += OnStateChanged;
+    }
+    
+    void OnStateChanged(AppleState newState)
+    {
+        if (newState.name == CardStateNames.EnlargedNew)
+        {
+            // Play custom effect
+            PlaySparkleEffect();
+        }
+    }
+    
+    void PlaySparkleEffect()
+    {
+        // Your custom effect logic
+    }
+}
+```
+
+### Adding Custom Card Slots
+
+```csharp
+public class MyCustomCardSlot : AlbumCardSlot
+{
+    protected override void OnCardPlaced(Card card)
+    {
+        base.OnCardPlaced(card);
+        
+        // Custom logic when card placed
+        PlaySpecialEffect();
+    }
+}
+```
+
+---
+
+## Troubleshooting
+
+### Cards Not Showing in Corner
+
+**Check:**
+1. AlbumViewPage has `cardPrefab` assigned
+2. AlbumViewPage has `bottomRightSlots` assigned (SlotContainer with 3 slots)
+3. CardSystemManager has pending cards: `GetPendingRevealCards().Count > 0`
+4. Page is in album proper (not menu page): Check with `IsInAlbumProper()`
+
+**Debug:**
+```csharp
+Debug.Log($"Pending cards: {CardSystemManager.Instance.GetPendingRevealCards().Count}");
+Debug.Log($"Is in album: {albumViewPage.IsInAlbumProper()}");
+```
+
+### Cards Spawning on Top of Each Other
+
+**Cause:** Corner slots not properly configured with `SlotIndex` property
+
+**Fix:**
+- Ensure each slot has unique `SlotIndex` (0, 1, 2)
+- Verify in inspector: Select each slot → Check `SlotIndex` field
+
+### Card Won't Flip
+
+**Check:**
+1. Card has `CardBack` child GameObject
+2. Card has `CardDisplay` child GameObject  
+3. Both have proper hierarchy: `Card → CardBack`, `Card → CardDisplay`
+4. State transitions are correct
+
+**Debug:**
+```csharp
+var cardBack = card.transform.Find("CardBack");
+var cardDisplay = card.transform.Find("CardDisplay");
+Debug.Log($"Back found: {cardBack != null}, Display found: {cardDisplay != null}");
+Debug.Log($"Current state: {card.GetCurrentStateName()}");
+```
+
+### Book Won't Flip to Correct Page
+
+**Check:**
+1. BookTabButton components configured with correct `zone` and `targetPage`
+2. AlbumViewPage has `tabContainer` assigned
+3. BookPro component reference assigned on AlbumViewPage
+
+**Debug:**
+```csharp
+// In AlbumViewPage
+foreach (var tab in _zoneTabs)
+{
+    Debug.Log($"Tab: {tab.Zone} → Page {tab.TargetPage}");
+}
+```
+
+### Cards Not Enlarging When Clicked in Album
+
+**Check:**
+1. Card is in `PlacedInSlotState`
+2. AlbumViewPage has `cardEnlargedBackdrop` and `cardEnlargedContainer` assigned
+3. Card was registered: `albumViewPage.RegisterCardInAlbum(card)`
+
+**Debug:**
+```csharp
+var enlargedState = card.GetStateComponent<CardAlbumEnlargedState>(CardStateNames.AlbumEnlarged);
+Debug.Log($"Enlarged state found: {enlargedState != null}");
+Debug.Log($"Current state: {card.GetCurrentStateName()}");
+```
+
+### Memory Leaks / Cards Not Destroying
+
+**Cause:** Event subscriptions not cleaned up
+
+**Fix Pattern:**
+```csharp
+void OnEnable()
+{
+    card.Context.OnDragStarted += HandleDrag;
+}
+
+void OnDisable()
+{
+    if (card != null && card.Context != null)
+    {
+        card.Context.OnDragStarted -= HandleDrag;
+    }
+}
+```
+
+### Booster Packs Not Appearing
+
+**Check:**
+1. BoosterOpeningPage has `boosterPackPrefab` assigned
+2. BoosterOpeningPage has `bottomRightSlots` assigned
+3. Called `SetAvailableBoosterCount()` before showing page
+
+**Debug:**
+```csharp
+Debug.Log($"Booster count: {CardSystemManager.Instance.GetBoosterPackCount()}");
+Debug.Log($"Booster prefab: {boosterOpeningPage.boosterPackPrefab != null}");
+```
+
+---
+
+## State Diagram
+
+```
+BOOSTER OPENING FLOW:
+IdleState ──click──> EnlargedNewState ──click──> RevealedState
+                 └──> EnlargedRepeatState ──┘
+                 └──> EnlargedLegendaryRepeatState ──┘
+
+ALBUM PLACEMENT FLOW:
+PendingFaceDownState ──drag──> DraggingRevealedState ──drop on slot──> PlacedInSlotState
+                                                                              │
+                                                                           click
+                                                                              │
+                                                                              ↓
+                                                                      AlbumEnlargedState
+                                                                              │
+                                                                           click
+                                                                              │
+                                                                              ↓
+                                                                      PlacedInSlotState
+```
+
+---
+
+## Additional Resources
+
+- **Code Location**: `Assets/Scripts/UI/CardSystem/`
+- **Card Prefabs**: `Assets/Prefabs/UI/Cards/`
+- **Card Definitions**: `Assets/Data/CardSystem/Definitions/`
+- **Album Scene**: `Assets/Scenes/Album.unity`
+
+**Related Systems:**
+- [UIPageController Documentation](ui_page_navigation.md) - UI page stack navigation
+- [DragAndDrop System](../Scripts/UI/DragAndDrop/Core/) - Base drag/drop framework
+- [Settings System](settings_readme.md) - Card system configuration
+
+---
+
+**Last Updated:** November 18, 2025  
+**Version:** 1.0  
+**Contributors:** Development Team
+