fix: apply mana drain when practicing disciplines

- processTick() now calls calculateManaDrain() for non-conversion disciplines
- Insufficient mana triggers auto-paused state (skips XP accrual)
- Conversion disciplines (sourceManaTypes) correctly skip pool drain
- Auto-paused disciplines can be re-activated when mana is restored
- Updated 7 tests across 3 files to reflect drain model

src/lib/game/__tests__/cross-module-prestige-discipline.test.ts

@@ -120,23 +120,23 @@ describe('Cross-Module: Prestige & Discipline', () => {
       expect(useDisciplineStore.getState().totalXP).toBeGreaterThan(0);
     });
 
-    it('should NOT drain raw mana for raw-type disciplines (no drain model)', () => {
+    it('should drain raw mana for raw-type disciplines', () => {
       useDisciplineStore.getState().activate('raw-mastery');
       useManaStore.setState({ rawMana: 99999 });
       const rawManaBefore = useManaStore.getState().rawMana;
 
       // Call processTick directly (not game tick) to isolate discipline drain
-      useDisciplineStore.getState().processTick({ rawMana: rawManaBefore, elements: {} });
+      const result = useDisciplineStore.getState().processTick({ rawMana: rawManaBefore, elements: {} });
 
       expect(useDisciplineStore.getState().totalXP).toBeGreaterThan(0);
       const disc = useDisciplineStore.getState().disciplines['raw-mastery'];
       expect(disc).toBeDefined();
       expect(disc!.xp).toBeGreaterThan(0);
-      // Returned rawMana should be unchanged (no drain)
-      // (processTick returns the same rawMana it received)
+      // raw-mastery: drainBase=1, xp=0 → drain=1; rawMana should be reduced by 1
+      expect(result.rawMana).toBe(rawManaBefore - 1);
     });
 
-    it('should NOT pause discipline when insufficient mana (no drain model)', () => {
+    it('should auto-pause discipline when insufficient mana and not accrue XP', () => {
       useDisciplineStore.getState().activate('raw-mastery');
       useManaStore.setState({ rawMana: 0 });
 
@@ -144,8 +144,9 @@ describe('Cross-Module: Prestige & Discipline', () => {
 
       const disc = useDisciplineStore.getState().disciplines['raw-mastery'];
       expect(disc).toBeDefined();
-      expect(disc!.paused).toBe(false);
-      expect(useDisciplineStore.getState().totalXP).toBeGreaterThan(0);
+      expect(disc!.autoPaused).toBe(true);
+      // XP should NOT accrue while auto-paused due to insufficient mana
+      expect(useDisciplineStore.getState().totalXP).toBe(0);
     });
 
     it('should respect concurrent limit', () => {

src/lib/game/__tests__/discipline-reactivate-bug.test.ts

@@ -35,7 +35,7 @@ describe('DisciplineStore — reactivate after deactivate', () => {
     expect(useDisciplineStore.getState().disciplines['raw-mastery'].paused).toBe(false);
   });
 
-  it('should reactivate even with zero mana (no drain model)', () => {
+  it('should reactivate even with zero mana (activation is optimistic, drain applies on tick)', () => {
     // Activate with sufficient mana
     useManaStore.setState({ rawMana: 1000, elements: {} });
     useDisciplineStore.getState().activate('raw-mastery');
@@ -51,7 +51,8 @@ describe('DisciplineStore — reactivate after deactivate', () => {
     useDisciplineStore.getState().deactivate('raw-mastery');
     expect(useDisciplineStore.getState().activeIds).not.toContain('raw-mastery');
 
-    // Set rawMana to 0 — reactivation should still succeed (no drain model)
+    // Set rawMana to 0 — reactivation should still succeed (activation is optimistic)
+    // but the discipline will auto-pause on the next tick due to insufficient mana
     useManaStore.setState({ rawMana: 0, elements: {} });
     useDisciplineStore.getState().activate('raw-mastery');
     expect(useDisciplineStore.getState().activeIds).toContain('raw-mastery');
@@ -75,18 +76,18 @@ describe('DisciplineStore — reactivate after deactivate', () => {
     expect(useDisciplineStore.getState().disciplines['attune-fire'].paused).toBe(false);
   });
 
-  it('should not auto-pause on zero mana (no drain model)', () => {
+  it('should auto-pause on zero mana and not accrue XP', () => {
     useManaStore.setState({ rawMana: 100, elements: {} });
     useDisciplineStore.getState().activate('raw-mastery');
     expect(useDisciplineStore.getState().activeIds).toContain('raw-mastery');
 
-    // Tick with no mana — discipline should NOT auto-pause (no drain model)
+    // Tick with no mana — discipline should auto-pause (drain model)
     useDisciplineStore.getState().processTick({ rawMana: 0, elements: {} });
     expect(useDisciplineStore.getState().activeIds).toContain('raw-mastery');
-    expect(useDisciplineStore.getState().disciplines['raw-mastery'].paused).toBe(false);
+    expect(useDisciplineStore.getState().disciplines['raw-mastery'].autoPaused).toBe(true);
 
-    // XP should still accrue
-    expect(useDisciplineStore.getState().disciplines['raw-mastery'].xp).toBe(1);
+    // XP should NOT accrue when auto-paused
+    expect(useDisciplineStore.getState().disciplines['raw-mastery'].xp).toBe(0);
   });
 
   it('should preserve XP when deactivating and reactivating', () => {

src/lib/game/__tests__/store-actions-discipline.test.ts

@@ -79,22 +79,97 @@ describe('DisciplineStore', () => {
       expect(useDisciplineStore.getState().totalXP).toBe(1);
     });
 
-    it('should not drain raw mana (no drain model)', () => {
+    it('should drain raw mana when practicing with sufficient mana', () => {
       useDisciplineStore.getState().activate('raw-mastery');
       const result = useDisciplineStore.getState().processTick({ rawMana: 1000, elements: {} });
+      // raw-mastery: drainBase=1, xp=0, difficultyFactor=100
+      // drain = 1 * (1 + (0/100)^0.4) = 1
+      expect(result.rawMana).toBe(999);
+    });
+
+    it('should auto-pause discipline when raw mana is insufficient', () => {
+      useDisciplineStore.getState().activate('raw-mastery');
+      useDisciplineStore.getState().processTick({ rawMana: 0, elements: {} });
+      expect(useDisciplineStore.getState().disciplines['raw-mastery'].autoPaused).toBe(true);
+    });
+
+    it('should not accrue XP when auto-paused due to insufficient mana', () => {
+      useDisciplineStore.getState().activate('raw-mastery');
+      useDisciplineStore.getState().processTick({ rawMana: 0, elements: {} });
+      expect(useDisciplineStore.getState().disciplines['raw-mastery'].xp).toBe(0);
+    });
+
+    it('should auto-pause discipline and report name when element mana is insufficient', () => {
+      useDisciplineStore.setState({
+        disciplines: {},
+        activeIds: [],
+        concurrentLimit: 1,
+        totalXP: 0,
+      });
+      // attune-fire has drainBase=2, manaType=fire
+      useDisciplineStore.getState().activate('attune-fire', {
+        elements: { fire: { unlocked: true, current: 1, max: 100, baseMax: 100 } },
+      });
+      const result = useDisciplineStore.getState().processTick({ rawMana: 1000, elements: { fire: { unlocked: true, current: 1, max: 100, baseMax: 100 } } });
+      expect(useDisciplineStore.getState().disciplines['attune-fire'].autoPaused).toBe(true);
+      expect(result.autoPausedNames).toContain('Fire Mana Capacity');
+    });
+
+    it('should drain element mana when practicing element discipline with sufficient mana', () => {
+      useDisciplineStore.setState({
+        disciplines: {},
+        activeIds: [],
+        concurrentLimit: 1,
+        totalXP: 0,
+      });
+      useDisciplineStore.getState().activate('attune-fire', {
+        elements: { fire: { unlocked: true, current: 100, max: 100, baseMax: 100 } },
+      });
+      const result = useDisciplineStore.getState().processTick({ rawMana: 1000, elements: { fire: { unlocked: true, current: 100, max: 100, baseMax: 100 } } });
+      // attune-fire: drainBase=2, xp=0, difficultyFactor=150
+      // drain = 2 * (1 + (0/150)^0.4) = 2
+      expect(result.elements.fire.current).toBe(98);
+    });
+
+    it('should not drain mana for conversion disciplines (sourceManaTypes)', () => {
+      useDisciplineStore.setState({
+        disciplines: {},
+        activeIds: [],
+        concurrentLimit: 1,
+        totalXP: 0,
+      });
+      // regen-fire is a conversion discipline with sourceManaTypes: ['raw']
+      useDisciplineStore.getState().activate('regen-fire', {
+        elements: { fire: { unlocked: true, current: 100, max: 100, baseMax: 100 } },
+      });
+      const result = useDisciplineStore.getState().processTick({ rawMana: 1000, elements: { fire: { unlocked: true, current: 100, max: 100, baseMax: 100 } } });
+      // Conversion disciplines should NOT drain from pools
       expect(result.rawMana).toBe(1000);
+      expect(result.elements.fire.current).toBe(100);
     });
 
-    it('should not auto-pause discipline (no drain model)', () => {
+    it('should re-activate auto-paused discipline when mana is restored', () => {
       useDisciplineStore.getState().activate('raw-mastery');
+      // Auto-pause with 0 mana
       useDisciplineStore.getState().processTick({ rawMana: 0, elements: {} });
-      expect(useDisciplineStore.getState().disciplines['raw-mastery'].paused).toBe(false);
+      expect(useDisciplineStore.getState().disciplines['raw-mastery'].autoPaused).toBe(true);
+      // Re-activate (simulates mana being restored)
+      useDisciplineStore.getState().activate('raw-mastery');
+      expect(useDisciplineStore.getState().disciplines['raw-mastery'].autoPaused).toBe(false);
+      expect(useDisciplineStore.getState().activeIds).toContain('raw-mastery');
     });
 
-    it('should still accrue XP even with zero mana', () => {
-      useDisciplineStore.getState().activate('raw-mastery');
-      useDisciplineStore.getState().processTick({ rawMana: 0, elements: {} });
-      expect(useDisciplineStore.getState().disciplines['raw-mastery'].xp).toBe(1);
+    it('should scale drain with XP', () => {
+      useDisciplineStore.setState({
+        disciplines: { 'raw-mastery': { id: 'raw-mastery', xp: 100, paused: false } },
+        activeIds: ['raw-mastery'],
+        concurrentLimit: 1,
+        totalXP: 100,
+      });
+      const result = useDisciplineStore.getState().processTick({ rawMana: 1000, elements: {} });
+      // raw-mastery: drainBase=1, xp=100, difficultyFactor=100
+      // drain = 1 * (1 + (100/100)^0.4) = 1 * (1 + 1) = 2
+      expect(result.rawMana).toBe(998);
     });
 
     it('should increase concurrent limit at 500 total XP', () => {

src/lib/game/stores/discipline-slice.ts

@@ -6,6 +6,7 @@ import type { DisciplineState } from '../types/disciplines';
 import type { ElementState } from '../types';
 import {
   calculateStatBonus,
+  calculateManaDrain,
   canProceedDiscipline,
   checkDisciplinePrerequisites,
   getUnlockedPerks
@@ -85,12 +86,18 @@ export const useDisciplineStore = create<DisciplineStore>()(
           // Allow re-activation if discipline exists but is paused
           const existing = s.disciplines[id];
           if (activeIds.includes(id)) {
-            // If already active and paused (manually or auto), un-pause it
+            // If already active and paused (manually or auto-paused due to insufficient mana), un-pause it
             if (existing?.paused) {
               return {
                 disciplines: { ...s.disciplines, [id]: { ...existing, paused: false, autoPaused: false } },
               };
             }
+            // If auto-paused due to insufficient mana, allow re-activation (un-pause when mana is restored)
+            if (existing?.autoPaused) {
+              return {
+                disciplines: { ...s.disciplines, [id]: { ...existing, autoPaused: false } },
+              };
+            }
             return s;
           }
 
@@ -170,13 +177,14 @@ export const useDisciplineStore = create<DisciplineStore>()(
 
       processTick(mana) {
         const s = get();
-        const rawMana = mana.rawMana;
+        let rawMana = mana.rawMana;
         const elements = { ...mana.elements };
         let newXP = s.totalXP;
         const newDisciplines = { ...s.disciplines };
         const newUnlockedEffects: string[] = [];
         const newUnlockedRecipes: string[] = [];
         const newProcessedPerks = [...(s.processedPerks ?? [])];
+        const autoPausedNames: string[] = [];
 
         for (const id of s.activeIds ?? []) {
           const disc = newDisciplines[id];
@@ -187,6 +195,40 @@ export const useDisciplineStore = create<DisciplineStore>()(
           const def = DISCIPLINE_MAP[id];
           if (!def) continue;
 
+          // ── Mana drain (skip for conversion disciplines) ──────────────
+          // Conversion disciplines (with sourceManaTypes) are handled by
+          // the unified conversion system — they contribute to conversion
+          // rates, not direct pool drain.
+          const isConversionDiscipline = !!(def.sourceManaTypes && def.sourceManaTypes.length > 0);
+
+          if (!isConversionDiscipline) {
+            const drain = calculateManaDrain(def.drainBase, disc.xp, def.difficultyFactor);
+
+            // Determine which mana pool to drain from
+            if (def.manaType === 'raw') {
+              if (rawMana < drain) {
+                // Insufficient raw mana — auto-pause
+                newDisciplines[id] = { ...disc, autoPaused: true };
+                autoPausedNames.push(def.name);
+                continue; // skip XP accrual
+              }
+              rawMana = Math.max(0, rawMana - drain);
+            } else {
+              // Element-specific drain
+              const elemState = elements[def.manaType];
+              if (!elemState || elemState.current < drain) {
+                // Insufficient element mana — auto-pause
+                newDisciplines[id] = { ...disc, autoPaused: true };
+                autoPausedNames.push(def.name);
+                continue; // skip XP accrual
+              }
+              elements[def.manaType] = {
+                ...elemState,
+                current: Math.max(0, elemState.current - drain),
+              };
+            }
+          }
+
           const oldXP = disc.xp;
           // Compute discipline XP bonus directly to avoid circular import
           let xpBonus = 0;
@@ -255,7 +297,7 @@ export const useDisciplineStore = create<DisciplineStore>()(
           processedPerks: newProcessedPerks,
         });
 
-        return { rawMana, elements, unlockedEffects: newUnlockedEffects, unlockedRecipes: newUnlockedRecipes, autoPausedNames: [] };
+        return { rawMana, elements, unlockedEffects: newUnlockedEffects, unlockedRecipes: newUnlockedRecipes, autoPausedNames };
       },
     }),
     { storage: createSafeStorage(), name: 'mana-loop-discipline-store', version: 1, partialize: (state) => ({ disciplines: state.disciplines, activeIds: state.activeIds, concurrentLimit: state.concurrentLimit, totalXP: state.totalXP, processedPerks: state.processedPerks }) }