Merge branch 'feat/building' into feat/craft-discovery

Assets/GAME/InputSystem_Actions.inputactions

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     _prefab: Assets/External/VFXPACK_FIRE_WALLCOEUR/Prefab/VFX_Fire.prefab
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Assets/GAME/Script/Building/BuildManager.cs

@@ -62,6 +62,13 @@ namespace Ashwild.Building
         [Tooltip("Layers that block a build (structures, props, players). Must NOT include the ground.")]
         [SerializeField] private LayerMask obstructionMask;
 
+        [Header("Demolition")]
+        [Tooltip("Layers the demolition aim can hit to target a committed structure. Narrow this to the structures' layer so walls, roofs, etc. are the only demolishable hits.")]
+        [SerializeField] private LayerMask buildMask = ~0;
+
+        [Tooltip("Overlay material added on top of the aimed build while it is the demolition target (e.g. a translucent red 'about to break' pass). Should be a transparent/additive material since it draws over the model.")]
+        [SerializeField] private Material demolitionMaterial;
+
         #endregion
 
         #region State
@@ -95,10 +102,16 @@ namespace Ashwild.Building
         private float yaw;
 
         /// <summary>
-        /// The local player's aim transform (camera), resolved when the ghost is attached.
+        /// The local player's aim transform (camera), resolved lazily and shared by placement and
+        /// demolition.
         /// </summary>
         private Transform aim;
 
+        /// <summary>
+        /// The committed build currently under the demolition aim, or null when none is targeted.
+        /// </summary>
+        private BuiltStructure demoTarget;
+
         /// <summary>
         /// Frame the ghost was attached, so a click landing that frame never confirms instantly.
         /// </summary>
@@ -141,6 +154,8 @@ namespace Ashwild.Building
             PlayerEvents.AttackPressed += HandleConfirm;
             PlayerEvents.SecondaryUsePressed += HandleCancel;
             PlayerEvents.HotbarScroll += HandleRotate;
+            PlayerEvents.BuildRotatePressed += HandleRotateKey;
+            PlayerEvents.DemolishModeChanged += HandleDemolishModeChanged;
         }
 
         /// <summary>
@@ -152,16 +167,27 @@ namespace Ashwild.Building
             PlayerEvents.AttackPressed -= HandleConfirm;
             PlayerEvents.SecondaryUsePressed -= HandleCancel;
             PlayerEvents.HotbarScroll -= HandleRotate;
+            PlayerEvents.BuildRotatePressed -= HandleRotateKey;
+            PlayerEvents.DemolishModeChanged -= HandleDemolishModeChanged;
 
             EndPlacement();
+            ClearDemoTarget();
         }
 
         /// <summary>
-        /// Drives the owned ghost along the aim each frame; frozen while input is locked (e.g. the
+        /// Each frame, in exactly one mode: in demolition mode it tracks which build the player aims
-        /// menu was reopened over an active placement).
+        /// at; otherwise it drives the owned ghost along the aim. Both are frozen while input is locked
+        /// (e.g. the menu reopened over a placement), and leaving demolition mode clears the target.
         /// </summary>
         private void Update()
         {
+            if (PlayerEvents.IsDemolishing && !PlayerEvents.InputLocked)
+            {
+                UpdateDemolitionTarget();
+                return;
+            }
+            ClearDemoTarget();
+
             if (ghost == null) return;
             if (PlayerEvents.InputLocked) return;
 
@@ -268,9 +294,7 @@ namespace Ashwild.Building
             ghost = go;
             ghostValidity = go.GetComponentInChildren<BuildGhost>(true);
             ghostSnaps = go.GetComponentsInChildren<BuildSnapPoint>(true);
-            aim = aimCamera != null ? aimCamera.transform : (Camera.main != null ? Camera.main.transform : null);
+            ResolveAim();
-            if (aim == null)
-                Debug.LogError("[BuildManager] Pas de caméra d'aim (Camera.main introuvable — la caméra du joueur est-elle taguée MainCamera ?).", this);
 
             placementBeganFrame = Time.frameCount;
             UpdateGhostPose();
@@ -278,11 +302,18 @@ namespace Ashwild.Building
         }
 
         /// <summary>
-        /// Left-click: commits the ghost's pose to the registry (spawned for everyone) and ends the
+        /// Left-click: demolishes the aimed build while in demolition mode, otherwise commits the
-        /// placement. Blocked on an invalid spot and on the very frame the ghost was attached.
+        /// ghost's pose to the registry (spawned for everyone) and ends the placement. Placement is
+        /// blocked on an invalid spot and on the very frame the ghost was attached.
         /// </summary>
         private void HandleConfirm()
         {
+            if (PlayerEvents.IsDemolishing)
+            {
+                TryDemolish();
+                return;
+            }
+
             if (ghost == null) return;
             if (PlayerEvents.InputLocked) return;
             if (Time.frameCount == placementBeganFrame) return;
@@ -316,6 +347,18 @@ namespace Ashwild.Building
             else if (scroll < 0f) yaw -= rotationStep;
         }
 
+        /// <summary>
+        /// R key: yaws the ghost by one rotation step in the same direction as a scroll-up, so the
+        /// build can be turned without the mouse wheel. Ignored when no ghost is being placed.
+        /// </summary>
+        private void HandleRotateKey()
+        {
+            if (ghost == null) return;
+            if (PlayerEvents.InputLocked) return;
+
+            yaw += rotationStep;
+        }
+
         /// <summary>
         /// Poses the ghost each frame: quantise the aim hit to the grid with the current yaw, then
         /// let a nearby matching socket pull it into an exact connection (sockets win over the grid).
@@ -410,6 +453,76 @@ namespace Ashwild.Building
             }
         }
 
+        /// <summary>
+        /// Resolves and caches the local player's aim transform — the assigned camera, else the
+        /// runtime Camera.main (the FPS camera). Logs once when neither is found.
+        /// </summary>
+        private Transform ResolveAim()
+        {
+            if (aim != null) return aim;
+
+            aim = aimCamera != null ? aimCamera.transform : (Camera.main != null ? Camera.main.transform : null);
+            if (aim == null)
+                Debug.LogError("[BuildManager] Pas de caméra d'aim (Camera.main introuvable — la caméra du joueur est-elle taguée MainCamera ?).", this);
+            return aim;
+        }
+
+        #endregion
+
+        #region Demolition
+
+        /// <summary>
+        /// Leaving demolition mode drops any current target so the crosshair returns to normal; entering
+        /// it needs nothing here — Update starts tracking on the next frame.
+        /// </summary>
+        private void HandleDemolishModeChanged(bool on)
+        {
+            if (!on) ClearDemoTarget();
+        }
+
+        /// <summary>
+        /// Casts the aim ray for a committed build and moves the demolition highlight when the target
+        /// changes: the previous build removes its overlay and the new one gets the demolition material
+        /// added on top, so exactly the aimed build reads as "about to break".
+        /// </summary>
+        private void UpdateDemolitionTarget()
+        {
+            Transform a = ResolveAim();
+            if (a == null) { ClearDemoTarget(); return; }
+
+            BuiltStructure hit = null;
+            if (Physics.Raycast(a.position, a.forward, out RaycastHit info, placeRange, buildMask, QueryTriggerInteraction.Ignore))
+                hit = info.collider.GetComponentInParent<BuiltStructure>();
+
+            if (hit == demoTarget) return;
+
+            if (demoTarget != null) demoTarget.ClearHighlight();
+            demoTarget = hit;
+            if (demoTarget != null) demoTarget.Highlight(demolitionMaterial);
+        }
+
+        /// <summary>
+        /// Left-click while demolishing: asks the registry to remove the aimed build for everyone. The
+        /// target stays until the next frame re-evaluates, so a miss simply retargets.
+        /// </summary>
+        private void TryDemolish()
+        {
+            if (demoTarget == null) return;
+            if (BuildRegistry.Instance != null)
+                BuildRegistry.Instance.RequestDemolish(demoTarget.gameObject);
+        }
+
+        /// <summary>
+        /// Drops the current demolition target, restoring its authored materials. Safe to call when
+        /// nothing is targeted.
+        /// </summary>
+        private void ClearDemoTarget()
+        {
+            if (demoTarget == null) return;
+            demoTarget.ClearHighlight();
+            demoTarget = null;
+        }
+
         #endregion
     }
 }

Assets/GAME/Script/Building/BuildRegistry.cs

@@ -99,6 +99,43 @@ namespace Ashwild.Building
 
         #endregion
 
+        #region Demolish Build
+
+        /// <summary>
+        /// Called by BuildManager when the local player demolishes a build they aimed at: resolves the
+        /// hit instance to its index in the replicated list and asks the server to remove it. The index
+        /// is a valid shared key because <see cref="spawned"/> stays aligned with <see cref="builds"/>
+        /// on every machine. No-op when the object is not one of our committed builds.
+        /// </summary>
+        public void RequestDemolish(GameObject builtInstance)
+        {
+            if (builtInstance == null) return;
+
+            int index = spawned.IndexOf(builtInstance);
+            if (index < 0)
+            {
+                Debug.LogWarning($"[BuildRegistry] '{builtInstance.name}' is not a committed build — nothing to demolish.", this);
+                return;
+            }
+            RequestDemolishServerRpc(index);
+        }
+
+        /// <summary>
+        /// Server-side: removes the record at this index, which replicates the removal (and the local
+        /// teardown + occupancy refresh) to every client. Range-guarded against a stale index from a
+        /// build that another player demolished during the round-trip.
+        /// </summary>
+        [ServerRpc(RequireOwnership = false)]
+        private void RequestDemolishServerRpc(int index, NetworkConnection conn = null)
+        {
+            if (index < 0 || index >= builds.Count) return;
+
+            // TODO: refund the builder's resources (conn → PlayerInventory) once build cost lands.
+            builds.RemoveAt(index);
+        }
+
+        #endregion
+
         #region Networked Ghost Preview
 
         /// <summary>
@@ -187,6 +224,7 @@ namespace Ashwild.Building
                 case SyncListOperation.RemoveAt:
                     DestroyAt(index);
                     spawned.RemoveAt(index);
+                    RecomputeOccupancy();
                     break;
 
                 case SyncListOperation.Clear:
@@ -210,7 +248,10 @@ namespace Ashwild.Building
                 Debug.LogWarning($"[BuildRegistry] Buildable id {record.buildableId} introuvable ou sans BuiltPrefab — rien de spawné.", this);
                 return null;
             }
-            return Instantiate(data.BuiltPrefab, record.position, record.rotation);
+
+            GameObject go = Instantiate(data.BuiltPrefab, record.position, record.rotation);
+            if (go.GetComponent<BuiltStructure>() == null) go.AddComponent<BuiltStructure>();
+            return go;
         }
 
         /// <summary>
@@ -246,6 +287,24 @@ namespace Ashwild.Building
                 MarkOccupancy(go);
         }
 
+        /// <summary>
+        /// Recomputes occupancy from scratch after a removal: clears every socket, then re-marks the
+        /// connected pairs across what remains. Without this a demolished piece would leave its former
+        /// neighbours' sockets stuck "occupied", so nothing could ever be snapped back into the gap.
+        /// </summary>
+        private void RecomputeOccupancy()
+        {
+            foreach (GameObject go in spawned)
+            {
+                if (go == null) continue;
+                foreach (BuildSnapPoint sp in go.GetComponentsInChildren<BuildSnapPoint>(true))
+                    sp.SetOccupied(false);
+            }
+
+            foreach (GameObject go in spawned)
+                MarkOccupancy(go);
+        }
+
         /// <summary>
         /// Marks the sockets a piece shares a position with — and the matching sockets on the pieces
         /// it touches — as occupied, so placement snapping skips them. Occupancy is derived purely

Assets/GAME/Script/Building/BuiltStructure.cs

@@ -0,0 +1,91 @@
+using UnityEngine;
+
+namespace Ashwild.Building
+{
+    /// <summary>
+    /// Runtime marker added to every committed structure instance the BuildRegistry spawns, so the
+    /// demolition aim can recognise a build from a raycast hit (GetComponentInParent) and hand its
+    /// root back to the registry to remove. It also owns the demolition highlight: while it is the
+    /// hammer's target the demolition material is added on top of every renderer (an extra overlay
+    /// pass, like the ghost), and removed again when the aim leaves — so the player sees exactly which
+    /// build will break. Pure local visual + a pure tag: nothing about it ever crosses the wire.
+    /// </summary>
+    [DisallowMultipleComponent]
+    public class BuiltStructure : MonoBehaviour
+    {
+        #region State
+
+        /// <summary>
+        /// Every child renderer, cached so the highlight can swap and restore their materials.
+        /// </summary>
+        private Renderer[] renderers;
+
+        /// <summary>
+        /// Each renderer's original materials, kept so the swap is fully reversible.
+        /// </summary>
+        private Material[][] baseMaterials;
+
+        /// <summary>
+        /// Whether the demolition material is currently applied, so swaps stay idempotent.
+        /// </summary>
+        private bool highlighted;
+
+        #endregion
+
+        #region Unity Lifecycle
+
+        /// <summary>
+        /// Caches every child renderer and its authored materials up front so highlighting is a cheap
+        /// array assignment with no per-frame allocation of the base look.
+        /// </summary>
+        private void Awake()
+        {
+            renderers = GetComponentsInChildren<Renderer>(true);
+            baseMaterials = new Material[renderers.Length][];
+            for (int i = 0; i < renderers.Length; i++)
+                baseMaterials[i] = renderers[i] != null ? renderers[i].sharedMaterials : new Material[0];
+        }
+
+        #endregion
+
+        #region Public API
+
+        /// <summary>
+        /// Adds the demolition material on top of each renderer's authored materials (an extra draw
+        /// pass), marking this build as the hammer's current target without hiding the model. Mirrors
+        /// the ghost overlay. No-op when already highlighted or no material was provided.
+        /// </summary>
+        public void Highlight(Material demolitionMaterial)
+        {
+            if (highlighted || demolitionMaterial == null) return;
+            highlighted = true;
+
+            for (int i = 0; i < renderers.Length; i++)
+            {
+                Renderer r = renderers[i];
+                if (r == null) continue;
+
+                Material[] baseMats = baseMaterials[i];
+                Material[] combined = new Material[baseMats.Length + 1];
+                for (int j = 0; j < baseMats.Length; j++) combined[j] = baseMats[j];
+                combined[baseMats.Length] = demolitionMaterial;
+
+                r.materials = combined;
+            }
+        }
+
+        /// <summary>
+        /// Restores each renderer's authored materials. No-op when not highlighted.
+        /// </summary>
+        public void ClearHighlight()
+        {
+            if (!highlighted) return;
+            highlighted = false;
+
+            for (int i = 0; i < renderers.Length; i++)
+                if (renderers[i] != null) renderers[i].materials = baseMaterials[i];
+        }
+
+        #endregion
+    }
+}

Assets/GAME/Script/Building/BuiltStructure.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: fe38331f524a7db4cb3d53381b9ea244

Assets/GAME/Script/Crafting/CraftDiscovery.cs

@@ -0,0 +1,119 @@
+using System.Collections.Generic;
+using UnityEngine;
+using FishNet.Object;
+using Ashwild.Inventory;
+using Ashwild.Player;
+
+namespace Ashwild.Crafting
+{
+    /// <summary>
+    /// The local player's craft-discovery knowledge: the set of items it has ever acquired.
+    /// A recipe is only revealed (and only craftable) once its ingredients have been discovered,
+    /// so the player uncovers crafts by gathering resources rather than seeing the whole catalog
+    /// at once. Discovery is triggered the first time an item enters the inventory — pickups,
+    /// harvest drops AND craft results all count, which lets crafting chains reveal step by step.
+    ///
+    /// This is owner-only local state: each player keeps its own knowledge, and it is never
+    /// replicated over the wire (no one else needs to read it). It mirrors PlayerInventory's
+    /// singleton pattern purely for reliable owner gating — set the Instance for the owning
+    /// client in OnStartNetwork, and gate the component off on remotes via ownerOnlyBehaviours.
+    /// </summary>
+    [DisallowMultipleComponent]
+    public class CraftDiscovery : NetworkBehaviour
+    {
+        #region Singleton
+
+        /// <summary>
+        /// The local player's discovery knowledge (set only on the owning client).
+        /// </summary>
+        public static CraftDiscovery Instance { get; private set; }
+
+        #endregion
+
+        #region State
+
+        private readonly HashSet<ItemData> discovered = new HashSet<ItemData>();
+
+        #endregion
+
+        #region Network Lifecycle
+
+        /// <summary>
+        /// Registers the singleton on the owning client only (before LocalPlayerSpawned fires).
+        /// </summary>
+        public override void OnStartNetwork()
+        {
+            base.OnStartNetwork();
+            if (base.Owner.IsLocalClient) Instance = this;
+        }
+
+        /// <summary>
+        /// Clears the singleton when this player leaves the network.
+        /// </summary>
+        public override void OnStopNetwork()
+        {
+            base.OnStopNetwork();
+            if (Instance == this) Instance = null;
+        }
+
+        #endregion
+
+        #region Unity Lifecycle
+
+        /// <summary>
+        /// Starts tracking every item the local player acquires.
+        /// </summary>
+        private void OnEnable()
+        {
+            PlayerEvents.ItemAdded += HandleItemAdded;
+        }
+
+        /// <summary>
+        /// Stops tracking — mirrors OnEnable exactly.
+        /// </summary>
+        private void OnDisable()
+        {
+            PlayerEvents.ItemAdded -= HandleItemAdded;
+        }
+
+        #endregion
+
+        #region Event Handlers
+
+        /// <summary>
+        /// Marks an acquired item as discovered. Guarded to the owning instance so a remote puppet
+        /// that briefly subscribed before being gated off can never drive discovery on the wrong copy.
+        /// </summary>
+        private void HandleItemAdded(ItemData item, int quantity)
+        {
+            if (Instance != this) return;
+            Discover(item);
+        }
+
+        #endregion
+
+        #region Public API
+
+        /// <summary>
+        /// Whether the local player has ever acquired this item (and therefore knows it).
+        /// </summary>
+        public bool IsDiscovered(ItemData item) => item != null && discovered.Contains(item);
+
+        #endregion
+
+        #region Internal Helpers
+
+        /// <summary>
+        /// Adds an item to the discovered set the first time it is seen and announces it on the bus
+        /// so the crafting view can reveal any recipe the item unlocks.
+        /// </summary>
+        private void Discover(ItemData item)
+        {
+            if (item == null) return;
+            if (discovered.Add(item))
+                PlayerEvents.RaiseItemDiscovered(item);
+        }
+
+        #endregion
+    }
+}

Assets/GAME/Script/Crafting/CraftDiscovery.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: fabb912832c44b945a26c8ef03db222a

Assets/GAME/Script/Crafting/CraftingManager.cs

@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Events;
 using Ashwild.Inventory;
@@ -31,6 +32,7 @@ namespace Ashwild.Crafting
 
         private PlayerInventory inventory;
         private bool bound;
+        private readonly HashSet<CraftingRecipe> unlockedRecipes = new HashSet<CraftingRecipe>();
 
         #endregion
 
@@ -43,19 +45,25 @@ namespace Ashwild.Crafting
 
         /// <summary>
         /// Returns whether the local player can currently craft the recipe the given number of times.
+        /// A recipe is only craftable once every ingredient has been discovered, on top of the usual
+        /// inventory check — an ingredient still shown as a mystery ("?") blocks the craft.
         /// </summary>
         public bool CanCraft(CraftingRecipe recipe, int count = 1)
         {
-            return PlayerInventory.Instance != null && recipe.CanCraft(PlayerInventory.Instance, count);
+            return PlayerInventory.Instance != null
+                && IsFullyDiscovered(recipe)
+                && recipe.CanCraft(PlayerInventory.Instance, count);
         }
 
         /// <summary>
-        /// Consumes the ingredients and produces the result if the local player can afford it.
+        /// Consumes the ingredients and produces the result if the local player can afford it and has
+        /// discovered every ingredient. The result item is added through the inventory, which in turn
+        /// discovers it — so crafting an intermediate result reveals the recipes further down the chain.
         /// </summary>
         public bool TryCraft(CraftingRecipe recipe, int count = 1)
         {
             PlayerInventory inv = PlayerInventory.Instance;
-            if (inv == null || !recipe.CanCraft(inv, count))
+            if (inv == null || !IsFullyDiscovered(recipe) || !recipe.CanCraft(inv, count))
                 return false;
 
             // Consume ingredients
@@ -82,6 +90,7 @@ namespace Ashwild.Crafting
         private void OnEnable()
         {
             PlayerEvents.LocalPlayerSpawned += HandleLocalPlayerSpawned;
+            PlayerEvents.ItemDiscovered += HandleItemDiscovered;
         }
 
         /// <summary>
@@ -90,6 +99,7 @@ namespace Ashwild.Crafting
         private void OnDisable()
         {
             PlayerEvents.LocalPlayerSpawned -= HandleLocalPlayerSpawned;
+            PlayerEvents.ItemDiscovered -= HandleItemDiscovered;
         }
 
         /// <summary>
@@ -98,7 +108,7 @@ namespace Ashwild.Crafting
         private void Start()
         {
             if (craftingUI != null)
-                craftingUI.Build(recipes, CanCraft, CountItem, TryCraft);
+                craftingUI.Build(recipes, CanCraft, CountItem, TryCraft, IsDiscovered, IsRecipeVisible);
             else
                 Debug.LogError("[CraftingManager] No CraftingUI assigned — the crafting panel will not populate.", this);
 
@@ -134,6 +144,19 @@ namespace Ashwild.Crafting
                 craftingUI.Refresh();
         }
 
+        /// <summary>
+        /// Reacts to a newly discovered item: announces any recipe it just unlocked (for the "NEW"
+        /// craft notification), then refreshes the view so those recipes appear and their once-mystery
+        /// ingredients are shown.
+        /// </summary>
+        private void HandleItemDiscovered(ItemData item)
+        {
+            NotifyNewlyUnlockedRecipes();
+
+            if (craftingUI != null)
+                craftingUI.Refresh();
+        }
+
         #endregion
 
         #region Internal Helpers
@@ -150,10 +173,41 @@ namespace Ashwild.Crafting
 
             inventory.onSlotChanged.AddListener(HandleInventoryChanged);
 
+            SeedUnlockedRecipes();
+
             if (craftingUI != null)
                 craftingUI.Refresh();
         }
 
+        /// <summary>
+        /// Records the recipes already revealed at bind time (e.g. from restored discoveries) so they
+        /// are treated as known and never fire a spurious "NEW" notification. With a fresh player this
+        /// is empty since discovery starts at zero.
+        /// </summary>
+        private void SeedUnlockedRecipes()
+        {
+            for (int i = 0; i < recipes.Length; i++)
+                if (IsRecipeVisible(recipes[i]))
+                    unlockedRecipes.Add(recipes[i]);
+        }
+
+        /// <summary>
+        /// Raises a "NEW" notification for every recipe that has just become visible (its first
+        /// discovered ingredient), each announced once. Called after an item is discovered.
+        /// </summary>
+        private void NotifyNewlyUnlockedRecipes()
+        {
+            for (int i = 0; i < recipes.Length; i++)
+            {
+                CraftingRecipe recipe = recipes[i];
+                if (unlockedRecipes.Contains(recipe)) continue;
+                if (!IsRecipeVisible(recipe)) continue;
+
+                unlockedRecipes.Add(recipe);
+                PlayerEvents.RaiseRecipeDiscovered(recipe.Icon, recipe.RecipeName);
+            }
+        }
+
         /// <summary>
         /// How many of an item the local player currently holds (0 when offline).
         /// </summary>
@@ -162,6 +216,37 @@ namespace Ashwild.Crafting
             return PlayerInventory.Instance != null ? PlayerInventory.Instance.CountItem(item) : 0;
         }
 
+        /// <summary>
+        /// Whether the local player has discovered the item (false when the discovery tracker isn't ready).
+        /// </summary>
+        private bool IsDiscovered(ItemData item)
+        {
+            return CraftDiscovery.Instance != null && CraftDiscovery.Instance.IsDiscovered(item);
+        }
+
+        /// <summary>
+        /// Whether the recipe should appear at all: revealed as soon as at least one of its ingredients
+        /// has been discovered. Undiscovered ingredients then show as a mystery until found.
+        /// </summary>
+        private bool IsRecipeVisible(CraftingRecipe recipe)
+        {
+            CraftingIngredient[] ingredients = recipe.Ingredients;
+            for (int i = 0; i < ingredients.Length; i++)
+                if (IsDiscovered(ingredients[i].item)) return true;
+            return false;
+        }
+
+        /// <summary>
+        /// Whether every ingredient of the recipe has been discovered — the gate for actually crafting it.
+        /// </summary>
+        private bool IsFullyDiscovered(CraftingRecipe recipe)
+        {
+            CraftingIngredient[] ingredients = recipe.Ingredients;
+            for (int i = 0; i < ingredients.Length; i++)
+                if (!IsDiscovered(ingredients[i].item)) return false;
+            return true;
+        }
+
         #endregion
     }
 }

Assets/GAME/Script/Crafting/CraftingUI.cs

@@ -42,6 +42,8 @@ namespace Ashwild.Crafting
         private Func<CraftingRecipe, int, bool> canCraftQuery;
         private Func<ItemData, int> countItemQuery;
         private Func<CraftingRecipe, int, bool> craftRequest;
+        private Func<ItemData, bool> isDiscoveredQuery;
+        private Func<CraftingRecipe, bool> isRecipeVisibleQuery;
         private readonly List<RecipeButtonUI> recipeButtons = new List<RecipeButtonUI>();
         private readonly List<GameObject> ingredientInstances = new List<GameObject>();
         private RecipeButtonUI selectedButton;
@@ -55,12 +57,15 @@ namespace Ashwild.Crafting
         /// <summary>
         /// Builds the recipe buttons (once) and wires the manager-owned queries/action. Safe to
         /// call again later to re-point the delegates; it then simply refreshes the display.
+        /// The discovery queries decide which recipes are shown and which ingredients are still a mystery.
         /// </summary>
-        public void Build(CraftingRecipe[] recipes, Func<CraftingRecipe, int, bool> canCraft, Func<ItemData, int> countItem, Func<CraftingRecipe, int, bool> craft)
+        public void Build(CraftingRecipe[] recipes, Func<CraftingRecipe, int, bool> canCraft, Func<ItemData, int> countItem, Func<CraftingRecipe, int, bool> craft, Func<ItemData, bool> isDiscovered, Func<CraftingRecipe, bool> isRecipeVisible)
         {
             canCraftQuery = canCraft;
             countItemQuery = countItem;
             craftRequest = craft;
+            isDiscoveredQuery = isDiscovered;
+            isRecipeVisibleQuery = isRecipeVisible;
 
             if (!built)
             {
@@ -81,8 +86,9 @@ namespace Ashwild.Crafting
         }
 
         /// <summary>
-        /// Recomputes craftability for every recipe button and refreshes the open detail.
+        /// Recomputes each recipe button's visibility (revealed once an ingredient is discovered) and
-        /// Called by the manager whenever the local player's inventory changes.
+        /// its craftability, then refreshes the open detail. Called by the manager whenever the local
+        /// player's inventory changes or a new item is discovered.
         /// </summary>
         public void Refresh()
         {
@@ -91,6 +97,9 @@ namespace Ashwild.Crafting
             for (int i = 0; i < recipeButtons.Count; i++)
             {
                 RecipeButtonUI btn = recipeButtons[i];
+                bool visible = isRecipeVisibleQuery == null || isRecipeVisibleQuery(btn.Recipe);
+                btn.gameObject.SetActive(visible);
+
                 bool canCraft = canCraftQuery != null && canCraftQuery(btn.Recipe, btn.CraftCount);
                 btn.UpdateCraftability(canCraft);
             }
@@ -193,12 +202,21 @@ namespace Ashwild.Crafting
                 GameObject slotGO = Instantiate(ingredientSlotPrefab, ingredientContainer);
                 IngredientSlotUI slotUI = slotGO.GetComponent<IngredientSlotUI>();
 
+                bool discovered = isDiscoveredQuery == null || isDiscoveredQuery(ingredients[i].item);
+                if (!discovered)
+                {
+                    slotUI.SetupMystery();
+                    canCraft = false;
+                }
+                else
+                {
                     int required = ingredients[i].quantity * count;
                     int playerHas = countItemQuery != null ? countItemQuery(ingredients[i].item) : 0;
                     slotUI.Setup(ingredients[i].item, required, playerHas);
 
                     if (playerHas < required)
                         canCraft = false;
+                }
 
                 ingredientInstances.Add(slotGO);
             }

Assets/GAME/Script/Crafting/IngredientSlotUI.cs

@@ -5,21 +5,45 @@ using Ashwild.Inventory;
 
 namespace Ashwild.Crafting
 {
+    /// <summary>
+    /// A single ingredient cell in the crafting detail panel. Renders either a known ingredient
+    /// (icon + required quantity, tinted by whether the player has enough) or a mystery placeholder
+    /// ("?") for an ingredient the player has not discovered yet.
+    /// </summary>
     public class IngredientSlotUI : MonoBehaviour
     {
         [SerializeField] private Image iconImage;
         [SerializeField] private TextMeshProUGUI quantityText;
 
+        [Header("Mystery (undiscovered ingredient)")]
+        [Tooltip("Icon shown for an ingredient the player hasn't discovered yet (a question mark).")]
+        [SerializeField] private Sprite mysteryIcon;
+
         [Header("Colors")]
         [SerializeField] private Color enoughColor = Color.white;
         [SerializeField] private Color missingColor = new Color(1f, 0.3f, 0.3f, 1f);
 
+        /// <summary>
+        /// Renders a known ingredient: its icon and required amount, dimmed/red when the player lacks it.
+        /// </summary>
         public void Setup(ItemData item, int required, int playerHas)
         {
+            quantityText.gameObject.SetActive(true);
             iconImage.sprite = item.Icon;
             quantityText.text = "x" + required;
             quantityText.color = playerHas >= required ? enoughColor : missingColor;
             iconImage.color = playerHas >= required ? Color.white : new Color(1f, 1f, 1f, 0.5f);
         }
+
+        /// <summary>
+        /// Renders an undiscovered ingredient as a mystery: the "?" icon with no quantity text, so the
+        /// player knows a craft exists but must still find what it needs and how much.
+        /// </summary>
+        public void SetupMystery()
+        {
+            iconImage.sprite = mysteryIcon;
+            iconImage.color = new Color(1f, 1f, 1f, 0.5f);
+            quantityText.gameObject.SetActive(false);
+        }
     }
 }

Assets/GAME/Script/Inventory/HotbarUI.cs

@@ -24,6 +24,10 @@ namespace Ashwild.Inventory
         [Header("Context Menu")]
         [SerializeField] private SlotContextMenu contextMenu;
 
+        [Header("Hover Description")]
+        [Tooltip("Same panel used by the inventory — assign the shared HoverDescriptionUI here too.")]
+        [SerializeField] private HoverDescriptionUI hoverDescription;
+
         private PlayerInventory inventory;
         private Tweener scaleTween;
         private Tweener alphaTween;
@@ -51,7 +55,7 @@ namespace Ashwild.Inventory
         {
             // Visual setup that does not need the player.
             for (int i = 0; i < hotbarSlot.Length; i++)
-                hotbarSlot[i].Initialize(i, InventoryUI.OnSwapRequested, OnSlotClicked);
+                hotbarSlot[i].Initialize(i, InventoryUI.OnSwapRequested, OnSlotClicked, OnSlotHoverEnter, OnSlotHoverExit);
 
             transform.localScale = Vector3.one * idleScale;
             if (canvasGroup != null)
@@ -167,6 +171,40 @@ namespace Ashwild.Inventory
                 hotbarSlot[index].UpdateVisual(inventory.GetSlot(index));
         }
 
+        /// <summary>
+        /// Shows the shared description panel for a hovered hotbar slot, but only while the inventory
+        /// is open — during normal play the hotbar must not pop a description. The duration bar
+        /// reflects the item's remaining uses/durability.
+        /// </summary>
+        private void OnSlotHoverEnter(int index)
+        {
+            if (hoverDescription == null || inventory == null || !PlayerEvents.IsInventoryOpen) return;
+
+            InventorySlot slot = inventory.GetSlot(index);
+            if (slot == null || slot.IsEmpty)
+            {
+                hoverDescription.Hide();
+                return;
+            }
+
+            ItemData item = slot.ItemData;
+            bool hasDuration = item.HasUses;
+            float fill = hasDuration ? (float)slot.CurrentUses / item.MaxUses : 0f;
+            string durationText = hasDuration ? $"{slot.CurrentUses} / {item.MaxUses}" : string.Empty;
+
+            hoverDescription.Show(new ItemDescriptionView(
+                item.Icon, item.ItemName, item.Description, hasDuration, fill, durationText));
+        }
+
+        /// <summary>
+        /// Hides the description panel when the pointer leaves a hotbar slot.
+        /// </summary>
+        private void OnSlotHoverExit()
+        {
+            if (hoverDescription != null)
+                hoverDescription.Hide();
+        }
+
         private void UpdateSelection(int selectedIndex)
         {
             for (int i = 0; i < hotbarSlot.Length; i++)

Assets/GAME/Script/Inventory/HoverDescriptionUI.cs

@@ -0,0 +1,110 @@
+using UnityEngine;
+using UnityEngine.UI;
+using TMPro;
+using DG.Tweening;
+
+namespace Ashwild.Inventory
+{
+    /// <summary>
+    /// The fixed description panel shown beside the inventory — a pure view. When the pointer
+    /// enters a filled slot the inventory manager hands it an <see cref="ItemDescriptionView"/> and
+    /// it fades its CanvasGroup in, drawing the icon, name, description and (for uses-tracked items)
+    /// the duration bar. It never reads ItemData or the inventory itself; it renders what it is given.
+    /// </summary>
+    [DisallowMultipleComponent]
+    public class HoverDescriptionUI : MonoBehaviour
+    {
+        #region Serialized Fields
+
+        [Header("References")]
+        [SerializeField] private CanvasGroup canvasGroup;
+        [SerializeField] private Image iconImage;
+        [SerializeField] private TextMeshProUGUI nameText;
+        [SerializeField] private TextMeshProUGUI descriptionText;
+
+        [Header("Duration Bar")]
+        [Tooltip("Root object of the duration/uses bar — shown only for items that track uses.")]
+        [SerializeField] private GameObject durationBarRoot;
+        [Tooltip("Filled image whose fillAmount maps to the remaining uses (Image Type = Filled).")]
+        [SerializeField] private Image durationBarFill;
+        [Tooltip("Label drawn over the bar, e.g. \"3 / 5\".")]
+        [SerializeField] private TextMeshProUGUI durationText;
+
+        [Header("Animation")]
+        [SerializeField] private float fadeDuration = 0.15f;
+
+        #endregion
+
+        #region State
+
+        private Tweener fadeTween;
+
+        #endregion
+
+        #region Unity Lifecycle
+
+        /// <summary>
+        /// Starts hidden so the panel only appears once a slot is actually hovered.
+        /// </summary>
+        private void Awake() => SetHidden();
+
+        /// <summary>
+        /// Kills the fade tween so it never targets the CanvasGroup after teardown.
+        /// </summary>
+        private void OnDestroy() => fadeTween?.Kill();
+
+        #endregion
+
+        #region Public API
+
+        /// <summary>
+        /// Draws the payload and fades the panel in. Called by the inventory manager on hover enter.
+        /// </summary>
+        public void Show(ItemDescriptionView view)
+        {
+            if (iconImage != null)
+            {
+                iconImage.sprite = view.Icon;
+                iconImage.enabled = view.Icon != null;
+            }
+            if (nameText != null)
+                nameText.text = view.Name;
+            if (descriptionText != null)
+                descriptionText.text = view.Description;
+
+            if (durationBarRoot != null)
+                durationBarRoot.SetActive(view.HasDuration);
+            if (view.HasDuration)
+            {
+                if (durationBarFill != null)
+                    durationBarFill.fillAmount = view.DurationFill;
+                if (durationText != null)
+                    durationText.text = view.DurationText;
+            }
+
+            fadeTween?.Kill();
+            fadeTween = canvasGroup.DOFade(1f, fadeDuration).SetUpdate(true);
+        }
+
+        /// <summary>
+        /// Fades the panel out via its CanvasGroup only — the GameObject stays active so it can be
+        /// shown again instantly. Called on hover exit / inventory close.
+        /// </summary>
+        public void Hide()
+        {
+            fadeTween?.Kill();
+            fadeTween = canvasGroup.DOFade(0f, fadeDuration).SetUpdate(true);
+        }
+
+        #endregion
+
+        #region Internal Helpers
+
+        /// <summary>
+        /// Instantly parks the panel invisible via the CanvasGroup, without deactivating it.
+        /// </summary>
+        private void SetHidden() => canvasGroup.alpha = 0f;
+
+        #endregion
+    }
+}

Assets/GAME/Script/Inventory/HoverDescriptionUI.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 40050a905c9108244901dadab24daa28

Assets/GAME/Script/Inventory/InventoryUI.cs

@@ -33,6 +33,9 @@ namespace Ashwild.Inventory
         [Header("Context Menu")]
         [SerializeField] private SlotContextMenu contextMenu;
 
+        [Header("Hover Description")]
+        [SerializeField] private HoverDescriptionUI hoverDescription;
+
         [Header("Categories")]
         [SerializeField] private InventoryCategoryManager categoryManager;
 
@@ -93,7 +96,7 @@ namespace Ashwild.Inventory
                 int slotIndex = inventory.HotbarSize + i;
                 GameObject slotGO = Instantiate(slotPrefab, slotContainer);
                 SlotUI slotUI = slotGO.GetComponent<SlotUI>();
-                slotUI.Initialize(slotIndex, OnSwapRequested, OnSlotClicked);
+                slotUI.Initialize(slotIndex, OnSwapRequested, OnSlotClicked, OnSlotHoverEnter, OnSlotHoverExit);
                 slotUIs[i] = slotUI;
             }
 
@@ -133,6 +136,9 @@ namespace Ashwild.Inventory
             if (contextMenu != null)
                 contextMenu.Hide();
 
+            if (hoverDescription != null)
+                hoverDescription.Hide();
+
             if (categoryManager != null)
                 categoryManager.Close();
 
@@ -192,6 +198,39 @@ namespace Ashwild.Inventory
             }
         }
 
+        /// <summary>
+        /// Builds the description payload for the hovered slot and shows the side panel. Empty slots
+        /// keep the panel hidden. The duration bar reflects the item's remaining uses/durability.
+        /// </summary>
+        private void OnSlotHoverEnter(int index)
+        {
+            if (hoverDescription == null || inventory == null) return;
+
+            InventorySlot slot = inventory.GetSlot(index);
+            if (slot == null || slot.IsEmpty)
+            {
+                hoverDescription.Hide();
+                return;
+            }
+
+            ItemData item = slot.ItemData;
+            bool hasDuration = item.HasUses;
+            float fill = hasDuration ? (float)slot.CurrentUses / item.MaxUses : 0f;
+            string durationText = hasDuration ? $"{slot.CurrentUses} / {item.MaxUses}" : string.Empty;
+
+            hoverDescription.Show(new ItemDescriptionView(
+                item.Icon, item.ItemName, item.Description, hasDuration, fill, durationText));
+        }
+
+        /// <summary>
+        /// Hides the description panel when the pointer leaves a slot.
+        /// </summary>
+        private void OnSlotHoverExit()
+        {
+            if (hoverDescription != null)
+                hoverDescription.Hide();
+        }
+
         private void RefreshSlot(int index)
         {
             if (slotUIs == null) return;

Assets/GAME/Script/Inventory/ItemDescriptionView.cs

@@ -0,0 +1,43 @@
+using UnityEngine;
+
+namespace Ashwild.Inventory
+{
+    /// <summary>
+    /// The view payload for the hover description panel: exactly what the panel renders (icon,
+    /// name, description, and an optional duration/uses bar), nothing more. The inventory manager
+    /// builds one of these from a hovered slot and pushes it into the view, so the panel never
+    /// touches ItemData or the inventory model — it just draws what it is handed.
+    /// </summary>
+    public readonly struct ItemDescriptionView
+    {
+        public readonly Sprite Icon;
+        public readonly string Name;
+        public readonly string Description;
+
+        /// <summary>
+        /// Whether the hovered item tracks uses/durability and should show its duration bar.
+        /// </summary>
+        public readonly bool HasDuration;
+
+        /// <summary>
+        /// Remaining uses as a 0..1 fill for the bar's Filled image.
+        /// </summary>
+        public readonly float DurationFill;
+
+        /// <summary>
+        /// The remaining/max label drawn over the bar, e.g. "3 / 5".
+        /// </summary>
+        public readonly string DurationText;
+
+        public ItemDescriptionView(Sprite icon, string name, string description,
+            bool hasDuration, float durationFill, string durationText)
+        {
+            Icon = icon;
+            Name = name;
+            Description = description;
+            HasDuration = hasDuration;
+            DurationFill = durationFill;
+            DurationText = durationText;
+        }
+    }
+}

Assets/GAME/Script/Inventory/ItemDescriptionView.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: b901ece22e48ee344837ad720d6f2e18

Assets/GAME/Script/Inventory/SlotUI.cs

@@ -6,7 +6,7 @@ using System;
 
 namespace Ashwild.Inventory
 {
-    public class SlotUI : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler, IDropHandler, IPointerClickHandler
+    public class SlotUI : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler, IDropHandler, IPointerClickHandler, IPointerEnterHandler, IPointerExitHandler
     {
         [Header("References")]
         [SerializeField] private Image iconImage;
@@ -26,6 +26,8 @@ namespace Ashwild.Inventory
         private int slotIndex;
         private Action<int, int> onSwapRequested;
         private Action<int, bool> onClicked;
+        private Action<int> onHoverEnter;
+        private Action onHoverExit;
 
         public int SlotIndex => slotIndex;
 
@@ -43,11 +45,14 @@ namespace Ashwild.Inventory
             ghostObject.SetActive(false);
         }
 
-        public void Initialize(int index, Action<int, int> swapCallback, Action<int, bool> clickCallback)
+        public void Initialize(int index, Action<int, int> swapCallback, Action<int, bool> clickCallback,
+            Action<int> hoverEnterCallback = null, Action hoverExitCallback = null)
         {
             slotIndex = index;
             onSwapRequested = swapCallback;
             onClicked = clickCallback;
+            onHoverEnter = hoverEnterCallback;
+            onHoverExit = hoverExitCallback;
         }
 
         /// <summary>
@@ -170,5 +175,23 @@ namespace Ashwild.Inventory
             if (eventData.button == PointerEventData.InputButton.Right)
                 onClicked?.Invoke(slotIndex, true);
         }
+
+        /// <summary>
+        /// Reports the hovered slot index so the manager can show its description panel. Suppressed
+        /// while a drag is in progress, where the panel would only get in the way.
+        /// </summary>
+        public void OnPointerEnter(PointerEventData eventData)
+        {
+            if (draggedSlot != null) return;
+            onHoverEnter?.Invoke(slotIndex);
+        }
+
+        /// <summary>
+        /// Reports that the pointer left the slot so the manager can hide the description panel.
+        /// </summary>
+        public void OnPointerExit(PointerEventData eventData)
+        {
+            onHoverExit?.Invoke();
+        }
     }
 }

Assets/GAME/Script/Player/Events/PlayerEvents.cs

@@ -25,6 +25,8 @@ namespace Ashwild.Player
         public static bool IsBuildMenuOpen { get; private set; }
         // True while a build ghost is being positioned in the world (menu closed, no structure placed yet).
         public static bool IsPlacingBuild { get; private set; }
+        // True while the build hammer is in demolition mode (right-click held, menu closed, not placing).
+        public static bool IsDemolishing { get; private set; }
         public static bool IsPaused { get; private set; }
 
         // True when a networked session is live (host or client).
@@ -52,11 +54,13 @@ namespace Ashwild.Player
         public static event Action CrouchPressed;
         public static event Action AttackPressed;
         public static event Action SecondaryUsePressed;         // right-click / secondary use (build menu, aim, block, ...)
+        public static event Action<bool> SecondaryUseHeld;      // right-click pressed (true) / released (false) — for tap-vs-hold gestures
         public static event Action InteractPressed;
         public static event Action DropPressed;
         public static event Action InventoryTogglePressed;
         public static event Action<int> HotbarSlotPressed;
         public static event Action<float> HotbarScroll;
+        public static event Action BuildRotatePressed;          // rotate the build ghost one step (R key) while placing
         public static event Action CancelPressed;               // UI "Cancel" (Escape) — back / pause / close
 
         // ============================================================
@@ -101,6 +105,8 @@ namespace Ashwild.Player
         public static event Action<ItemData, int> ItemDropped;
         public static event Action<ItemData> ItemConsumed;
         public static event Action<ItemData, int> ItemPickedUp;
+        public static event Action<ItemData> ItemDiscovered;         // an item entered the inventory for the first time (unlocks recipes)
+        public static event Action<Sprite, string> RecipeDiscovered; // a recipe was just revealed (icon, name) — for the "NEW" craft notification
         public static event Action<ItemData> HeldItemChanged;
         public static event Action<bool> InventoryOpenChanged;
         public static event Action<bool> ChestOpenChanged;
@@ -128,6 +134,7 @@ namespace Ashwild.Player
         public static event Action BuildMenuToggleRequested;    // the build hammer asks to open/close the construction menu
         public static event Action<bool> BuildMenuOpenChanged;  // the construction menu opened (true) or closed (false)
         public static event Action<bool> BuildPlacingChanged;   // a build ghost started (true) / stopped (false) being positioned
+        public static event Action<bool> DemolishModeChanged;   // the hammer entered (true) / left (false) demolition mode (right-click held)
 
         // ============================================================
         // Cooking events
@@ -182,11 +189,13 @@ namespace Ashwild.Player
         public static void RaiseCrouchPressed() { Log(nameof(CrouchPressed)); CrouchPressed?.Invoke(); }
         public static void RaiseAttackPressed() { Log(nameof(AttackPressed)); AttackPressed?.Invoke(); }
         public static void RaiseSecondaryUsePressed() { Log(nameof(SecondaryUsePressed)); SecondaryUsePressed?.Invoke(); }
+        public static void RaiseSecondaryUseHeld(bool held) { Log(nameof(SecondaryUseHeld)); SecondaryUseHeld?.Invoke(held); }
         public static void RaiseInteractPressed() { Log(nameof(InteractPressed)); InteractPressed?.Invoke(); }
         public static void RaiseDropPressed() { Log(nameof(DropPressed)); DropPressed?.Invoke(); }
         public static void RaiseInventoryTogglePressed() { Log(nameof(InventoryTogglePressed)); InventoryTogglePressed?.Invoke(); }
         public static void RaiseHotbarSlotPressed(int i) { Log(nameof(HotbarSlotPressed)); HotbarSlotPressed?.Invoke(i); }
         public static void RaiseHotbarScroll(float f) { HotbarScroll?.Invoke(f); }
+        public static void RaiseBuildRotatePressed() { Log(nameof(BuildRotatePressed)); BuildRotatePressed?.Invoke(); }
         public static void RaiseCancelPressed() { Log(nameof(CancelPressed)); CancelPressed?.Invoke(); }
 
         public static void RaiseGroundedChanged(bool grounded, float impactSpeed)
@@ -248,6 +257,8 @@ namespace Ashwild.Player
         public static void RaiseItemDropped(ItemData d, int q) { Log(nameof(ItemDropped)); ItemDropped?.Invoke(d, q); }
         public static void RaiseItemConsumed(ItemData d) { Log(nameof(ItemConsumed)); ItemConsumed?.Invoke(d); }
         public static void RaiseItemPickedUp(ItemData d, int q) { Log(nameof(ItemPickedUp)); ItemPickedUp?.Invoke(d, q); }
+        public static void RaiseItemDiscovered(ItemData d) { Log(nameof(ItemDiscovered)); ItemDiscovered?.Invoke(d); }
+        public static void RaiseRecipeDiscovered(Sprite icon, string recipeName) { Log(nameof(RecipeDiscovered)); RecipeDiscovered?.Invoke(icon, recipeName); }
         public static void RaiseHeldItemChanged(ItemData d) { Log(nameof(HeldItemChanged)); HeldItemChanged?.Invoke(d); }
         public static void RaiseInventoryOpenChanged(bool b)
         {
@@ -294,6 +305,17 @@ namespace Ashwild.Player
             BuildPlacingChanged?.Invoke(placing);
         }
 
+        /// <summary>
+        /// Toggles demolition mode (right-click held with the hammer out). Owner-side only; the
+        /// hammer raises it and BuildManager drives the world-facing targeting/destroy from it.
+        /// </summary>
+        public static void RaiseDemolishModeChanged(bool on)
+        {
+            IsDemolishing = on;
+            Log(nameof(DemolishModeChanged));
+            DemolishModeChanged?.Invoke(on);
+        }
+
         public static void RaiseFoodPlacedToCook(ItemData raw) { Log(nameof(FoodPlacedToCook)); FoodPlacedToCook?.Invoke(raw); }
         public static void RaiseFoodCookedReady(ItemData cooked) { Log(nameof(FoodCookedReady)); FoodCookedReady?.Invoke(cooked); }
         public static void RaiseFuelAdded(ItemData fuel) { Log(nameof(FuelAdded)); FuelAdded?.Invoke(fuel); }
@@ -376,6 +398,7 @@ namespace Ashwild.Player
             IsChestOpen = false;
             IsBuildMenuOpen = false;
             IsPlacingBuild = false;
+            IsDemolishing = false;
             IsPaused = false;
             HoveredInteractable = null;
         }

Assets/GAME/Script/Player/HeldItems/BuildHammerBehaviour.cs

@@ -4,21 +4,28 @@ using Ashwild.Inventory;
 namespace Ashwild.Player
 {
     /// <summary>
-    /// Held-item logic for the build hammer, placed on its hand prefab. While equipped it
+    /// Held-item logic for the build hammer, placed on its hand prefab. It turns the single
-    /// listens to the secondary-use input (right-click) and asks the construction UI to
+    /// right-click into two gestures without any extra keybind: a quick <b>tap</b> opens/closes the
-    /// open/close through the bus — it never reaches for the menu itself, so the hammer
+    /// construction menu through the bus, while <b>holding</b> right-click past a short threshold puts
-    /// stays a pure input source and the UI owns its own state. Left-click placement will
+    /// the hammer into demolition mode for as long as it is held (releasing leaves it). The hammer
-    /// be added on top of this once the build menu exists.
+    /// stays a pure input source — it only raises bus requests; BuildManager owns the menu and the
+    /// world-facing targeting/destroy, so this never reaches for either.
     /// </summary>
     [DisallowMultipleComponent]
     public class BuildHammerBehaviour : MonoBehaviour, IHeldItemBehaviour
     {
         #region Serialized Fields
 
-        [Header("Cooldown")]
+        [Header("Gestures")]
         /// <summary>
-        /// Minimum time, in seconds, between two menu toggles so a held right-click
+        /// How long, in seconds, right-click must stay held before it counts as a demolition hold
-        /// does not flicker the menu open and shut.
+        /// instead of a menu tap. A release before this opens/closes the menu.
+        /// </summary>
+        [SerializeField] private float holdThreshold = 0.2f;
+
+        /// <summary>
+        /// Minimum time, in seconds, between two menu toggles so a burst of taps does not flicker the
+        /// menu open and shut.
         /// </summary>
         [SerializeField] private float toggleCooldown = 0.25f;
 
@@ -31,24 +38,58 @@ namespace Ashwild.Player
         /// </summary>
         private float nextToggleTime;
 
+        /// <summary>
+        /// True between an accepted press and its release. A press ignored at the gate (input locked
+        /// or already placing) never sets this, so its release is ignored too.
+        /// </summary>
+        private bool secondaryDown;
+
+        /// <summary>
+        /// Time, in seconds, the current accepted press began — measured against <see cref="holdThreshold"/>.
+        /// </summary>
+        private float secondaryDownTime;
+
+        /// <summary>
+        /// True while the hold has crossed into demolition mode, so the release ends the mode rather
+        /// than toggling the menu.
+        /// </summary>
+        private bool demoActive;
+
         #endregion
 
         #region Unity Lifecycle
 
         /// <summary>
-        /// Subscribes to the secondary-use input for as long as the hammer is held.
+        /// Subscribes to the right-click hold stream for as long as the hammer is held.
         /// </summary>
         private void OnEnable()
         {
-            PlayerEvents.SecondaryUsePressed += HandleSecondaryUse;
+            PlayerEvents.SecondaryUseHeld += HandleSecondaryUse;
         }
 
         /// <summary>
-        /// Unsubscribes when the hammer is put away (the prefab is destroyed).
+        /// Unsubscribes and leaves demolition mode cleanly when the hammer is put away (its prefab is
+        /// destroyed mid-hold), so the mode never sticks on with no hammer to release it.
         /// </summary>
         private void OnDisable()
         {
-            PlayerEvents.SecondaryUsePressed -= HandleSecondaryUse;
+            PlayerEvents.SecondaryUseHeld -= HandleSecondaryUse;
+            if (demoActive) ExitDemolition();
+            secondaryDown = false;
+        }
+
+        /// <summary>
+        /// Promotes a sustained press into demolition mode once it outlasts the tap threshold. Held
+        /// out of Update (not a timer) so the mode drops instantly if input locks or a placement
+        /// begins mid-hold.
+        /// </summary>
+        private void Update()
+        {
+            if (!secondaryDown || demoActive) return;
+            if (PlayerEvents.InputLocked || PlayerEvents.IsPlacingBuild) return;
+            if (Time.time - secondaryDownTime < holdThreshold) return;
+
+            EnterDemolition();
         }
 
         #endregion
@@ -56,8 +97,8 @@ namespace Ashwild.Player
         #region IHeldItemBehaviour
 
         /// <summary>
-        /// Nothing to link yet: toggling the menu needs no player refs. Present to satisfy
+        /// Nothing to link: the hammer only raises bus requests. Present to satisfy the held-item
-        /// the held-item contract; placement logic added later will use the context.
+        /// contract; BuildManager holds the player/world refs the build UX needs.
         /// </summary>
         public void Setup(HeldItemContext context, ItemData item)
         {
@@ -68,20 +109,60 @@ namespace Ashwild.Player
         #region Event Handlers
 
         /// <summary>
-        /// Requests the construction menu to open/close on right-click, gated by lock and
+        /// The single right-click gesture, split by press and release: a press is tracked (unless
-        /// cooldown. While a ghost is being positioned, right-click cancels the placement instead
+        /// input is locked or a ghost is being placed, where right-click means "cancel" and is left to
-        /// (handled by the placement controller), so the menu is left alone here.
+        /// BuildManager); its release either ends demolition mode (if the hold engaged it) or, for a
+        /// quick tap, toggles the construction menu under the cooldown.
         /// </summary>
-        private void HandleSecondaryUse()
+        private void HandleSecondaryUse(bool held)
         {
-            if (PlayerEvents.InputLocked) return;
+            if (held)
-            if (PlayerEvents.IsPlacingBuild) return;
+            {
-            if (Time.time < nextToggleTime) return;
+                if (PlayerEvents.InputLocked || PlayerEvents.IsPlacingBuild) return;
+                secondaryDown = true;
+                secondaryDownTime = Time.time;
+                return;
+            }
 
+            if (!secondaryDown) return;
+            secondaryDown = false;
+
+            if (demoActive) ExitDemolition();
+            else ToggleMenu();
+        }
+
+        #endregion
+
+        #region Internal Helpers
+
+        /// <summary>
+        /// Requests the construction menu to open/close, gated by the toggle cooldown.
+        /// </summary>
+        private void ToggleMenu()
+        {
+            if (Time.time < nextToggleTime) return;
             nextToggleTime = Time.time + toggleCooldown;
             PlayerEvents.RaiseBuildMenuToggleRequested();
         }
 
+        /// <summary>
+        /// Enters demolition mode and announces it on the bus.
+        /// </summary>
+        private void EnterDemolition()
+        {
+            demoActive = true;
+            PlayerEvents.RaiseDemolishModeChanged(true);
+        }
+
+        /// <summary>
+        /// Leaves demolition mode and announces it on the bus.
+        /// </summary>
+        private void ExitDemolition()
+        {
+            demoActive = false;
+            PlayerEvents.RaiseDemolishModeChanged(false);
+        }
+
         #endregion
     }
 }

Assets/GAME/Script/Player/Input/InputManager.cs

@@ -200,10 +200,12 @@ namespace Ashwild.Player
             WireButton(playerMap, "Crouch", PlayerEvents.RaiseCrouchPressed);
             WireButton(playerMap, "Attack", PlayerEvents.RaiseAttackPressed);
             WireButton(playerMap, "SecondaryUse", PlayerEvents.RaiseSecondaryUsePressed);
+            WireHold(playerMap, "SecondaryUse", PlayerEvents.RaiseSecondaryUseHeld);
             WireButton(playerMap, "Interact", PlayerEvents.RaiseInteractPressed);
             WireButton(playerMap, "Drop", PlayerEvents.RaiseDropPressed);
             WireButton(playerMap, "Inventory", PlayerEvents.RaiseInventoryTogglePressed);
             WireScrollY(playerMap, "HotbarScroll", PlayerEvents.RaiseHotbarScroll);
+            WireButton(playerMap, "BuildRotate", PlayerEvents.RaiseBuildRotatePressed);
 
             for (int i = 0; i < 10; i++)
             {

Assets/GAME/Script/UI/NotificationItemUI.cs

@@ -19,6 +19,7 @@ namespace Ashwild.UI
         private int totalQuantity;
         private float hideTimer;
         private bool isHiding;
+        private bool isDiscovery;
 
         private Tweener fadeTween;
         private Tweener slideTween;
@@ -30,6 +31,9 @@ namespace Ashwild.UI
         // A notification is either a gain (+) or a loss (-); merging only happens within the same direction.
         public bool IsGain => totalQuantity >= 0;
 
+        // A discovery notification (icon + name + "NEW" badge) never merges with a gain/loss one.
+        public bool IsDiscovery => isDiscovery;
+
         public void Initialize(ItemData item, int signedQuantity, Color numberColor, float displayDuration, float slideInDuration, Ease slideInEase)
         {
             itemData = item;
@@ -49,6 +53,34 @@ namespace Ashwild.UI
             fadeTween = canvasGroup.DOFade(1f, slideInDuration).SetEase(Ease.OutQuad);
         }
 
+        /// <summary>
+        /// Sets up a discovery notification: an icon and name (of the unlocked recipe) with a fixed
+        /// badge (e.g. "NEW") in the number slot, tinted with the caller-chosen colour. It carries no
+        /// quantity and never merges, so it reads as a one-time "recipe unlocked" cue.
+        /// </summary>
+        public void InitializeDiscovery(Sprite icon, string displayName, string badgeText, Color badgeColor, float displayDuration, float slideInDuration)
+        {
+            itemData = null;
+            isDiscovery = true;
+            hideTimer = displayDuration;
+            isHiding = false;
+
+            if (iconImage != null)
+                iconImage.sprite = icon;
+
+            if (labelText != null)
+                labelText.text = displayName;
+
+            if (numberText != null)
+            {
+                numberText.text = badgeText;
+                numberText.color = badgeColor;
+            }
+
+            canvasGroup.alpha = 0f;
+            fadeTween = canvasGroup.DOFade(1f, slideInDuration).SetEase(Ease.OutQuad);
+        }
+
         public void AddQuantity(int signedAmount, float displayDuration)
         {
             totalQuantity += signedAmount;

Assets/GAME/Script/UI/NotificationUI.cs

@@ -30,6 +30,11 @@ namespace Ashwild.UI
         [SerializeField] private Color gainColor = new Color(0.45f, 1f, 0.45f); // picked up / added
         [SerializeField] private Color lossColor = new Color(1f, 0.45f, 0.45f); // dropped / consumed
 
+        [Header("Discovery")]
+        [Tooltip("Badge shown in the number slot when a new item/recipe is discovered.")]
+        [SerializeField] private string discoveryLabel = "NEW";
+        [SerializeField] private Color discoveryColor = new Color(1f, 0.85f, 0.3f);
+
         private readonly List<NotificationItemUI> activeNotifications = new List<NotificationItemUI>();
 
         private void OnEnable()
@@ -37,6 +42,7 @@ namespace Ashwild.UI
             PlayerEvents.ItemAdded += OnItemAdded;
             PlayerEvents.ItemDropped += OnItemDropped;
             PlayerEvents.ItemConsumed += OnItemConsumed;
+            PlayerEvents.RecipeDiscovered += OnRecipeDiscovered;
             PlayerEvents.FoodPlacedToCook += OnItemSpent;
             PlayerEvents.FuelAdded += OnItemSpent;
         }
@@ -46,6 +52,7 @@ namespace Ashwild.UI
             PlayerEvents.ItemAdded -= OnItemAdded;
             PlayerEvents.ItemDropped -= OnItemDropped;
             PlayerEvents.ItemConsumed -= OnItemConsumed;
+            PlayerEvents.RecipeDiscovered -= OnRecipeDiscovered;
             PlayerEvents.FoodPlacedToCook -= OnItemSpent;
             PlayerEvents.FuelAdded -= OnItemSpent;
         }
@@ -53,6 +60,7 @@ namespace Ashwild.UI
         private void OnItemAdded(ItemData item, int quantity)   => Push(item, quantity);
         private void OnItemDropped(ItemData item, int quantity) => Push(item, -quantity);
         private void OnItemConsumed(ItemData item)              => Push(item, -1);
+        private void OnRecipeDiscovered(Sprite icon, string recipeName) => PushDiscovery(icon, recipeName);
 
         // Food placed on a cooking station or fuel fed to it both leave the inventory by one.
         private void OnItemSpent(ItemData item)                 => Push(item, -1);
@@ -69,7 +77,8 @@ namespace Ashwild.UI
             // Merge only with a notification for the same item AND same direction
             for (int i = 0; i < activeNotifications.Count; i++)
             {
-                if (activeNotifications[i] != null && activeNotifications[i].ItemData == item
+                if (activeNotifications[i] != null && !activeNotifications[i].IsDiscovery
+                    && activeNotifications[i].ItemData == item
                     && activeNotifications[i].IsGain == gain)
                 {
                     activeNotifications[i].AddQuantity(signedQuantity, displayDuration);
@@ -94,6 +103,29 @@ namespace Ashwild.UI
             activeNotifications.Add(notification);
         }
 
+        /// <summary>
+        /// Pushes a one-time "NEW" notification for a newly unlocked recipe: its result icon and name
+        /// with the configured badge in the discovery colour. Never merges with anything.
+        /// </summary>
+        private void PushDiscovery(Sprite icon, string recipeName)
+        {
+            activeNotifications.RemoveAll(n => n == null);
+
+            GameObject go = Instantiate(notificationPrefab, container);
+            NotificationItemUI notification = go.GetComponent<NotificationItemUI>();
+
+            float targetY = startOffsetY + activeNotifications.Count * (notificationHeight + spacing);
+
+            RectTransform rt = notification.RectTransform;
+            rt.anchoredPosition = new Vector2(0f, targetY - 30f);
+
+            notification.InitializeDiscovery(icon, recipeName, discoveryLabel, discoveryColor, displayDuration, slideInDuration);
+
+            rt.DOAnchorPosY(targetY, slideInDuration).SetEase(slideInEase);
+
+            activeNotifications.Add(notification);
+        }
+
         private void LateUpdate()
         {
             // Clean up destroyed notifications and reposition remaining ones