Update game.js

game.js

@@ -1377,6 +1377,18 @@ class Game {
                             transform: translateX(-50%) scale(1.1);
                         }
                     }
+                    @keyframes box-pulse {
+                        0%, 100% { 
+                            background: rgba(255, 0, 0, 0.9);
+                            box-shadow: 0 0 20px rgba(255, 0, 0, 0.8), 
+                                       0 0 40px rgba(255, 0, 0, 0.4);
+                        }
+                        50% { 
+                            background: rgba(255, 50, 50, 1);
+                            box-shadow: 0 0 30px rgba(255, 100, 100, 1), 
+                                       0 0 60px rgba(255, 0, 0, 0.8);
+                        }
+                    }
                 `;
                 document.head.appendChild(style);
             }