SkillsTab Modifications (Bugs 9,11,12,13)

src/lib/game/store.ts

@@ -1797,10 +1797,38 @@ export const useGameStore = create<GameStore>()(
           }
         }
 
-        // Check mana cost (with focused mind reduction)
+        // Check raw mana cost (with focused mind reduction)
         const costMult = getStudyCostMultiplier(state.skills);
         const cost = Math.floor(sk.base * (currentLevel + 1) * costMult);
-        if (state.rawMana < cost) return;
+        if (state.rawMana < cost) {
+          set({
+            log: [`❌ Not enough raw mana to study ${sk.name}.`, ...state.log.slice(0, 49)],
+          });
+          return;
+        }
+        
+        // Check additional cost (e.g., element mana for Bug 9, 11)
+        if (sk.cost) {
+          if (sk.cost.type === 'element') {
+            const element = state.elements[sk.cost.element];
+            if (!element || element.current < sk.cost.amount) {
+              set({
+                log: [`❌ Need ${sk.cost.amount} ${sk.cost.element} mana to study ${sk.name}.`, ...state.log.slice(0, 49)],
+              });
+              return;
+            }
+            // Deduct element mana
+            set({
+              elements: {
+                ...state.elements,
+                [sk.cost.element]: {
+                  ...state.elements[sk.cost.element],
+                  current: state.elements[sk.cost.element].current - sk.cost.amount,
+                },
+              },
+            });
+          }
+        }
 
         // Start studying
         set({
@@ -2522,7 +2550,7 @@ export const useGameStore = create<GameStore>()(
         const instance = state.equipmentInstances[instanceId];
         if (!instance || instance.enchantments.length === 0) return;
 
-        const disenchantLevel = state.skills.disenchanting || 0;
+        const disenchantLevel = 0; // disenchanting skill removed (Bug 13)
         const recoveryRate = 0.1 + disenchantLevel * 0.2; // 10% base + 20% per level
 
         let totalRecovered = 0;