Session 1: Particle effects system with click, building, and achievement visual feedback

js/game.js

@@ -101,6 +101,7 @@ const Game = {
         
         // Visual feedback
         UI.showFloatingText(event.clientX, event.clientY, `+${this.formatNumber(amount)}`);
+        Particles.createClickParticles(event.clientX, event.clientY, 8);
         UI.update();
     },
 
@@ -180,6 +181,14 @@ const Game = {
             this.state.buildings[buildingId] = (this.state.buildings[buildingId] || 0) + 1;
             
             UI.showNotification(`Bought ${BUILDINGS[buildingId].name}!`, 'success');
+            
+            // Particle effect on building purchase
+            const card = document.getElementById(`building-${buildingId}`);
+            if (card) {
+                const rect = card.getBoundingClientRect();
+                Particles.createBuildingEffect(rect.left + rect.width / 2, rect.top + rect.height / 2);
+            }
+            
             UI.update();
             return true;
         }