인트로 시작하기 버튼 둥실둥실 애니메이션 제거

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/app/globals.css

@@ -257,10 +257,3 @@ body {
   background: #fff;
   filter: blur(16px);
 }
-@keyframes bounce-slow {
-  0%, 100% { transform: translateY(0); }
-  50% { transform: translateY(-7px); }
-}
-.animate-bounce-slow {
-  animation: bounce-slow 1.6s ease-in-out infinite;
-}

src/components/game/IntroScreen.tsx

@@ -71,7 +71,7 @@ export default function IntroScreen({ onDone }: { onDone: () => void }) {
       >
         <button
           onClick={start}
-          className="nature-btn animate-bounce-slow px-12 py-4 text-2xl shadow-2xl"
+          className="nature-btn px-12 py-4 text-2xl shadow-2xl"
         >
           🐾 시작하기
         </button>