.sound-wave{pointer-events:none;border:3px solid #ec489966;border-radius:50%;width:100%;height:100%;animation:1s ease-out infinite sound-ripple;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}@keyframes sound-ripple{0%{opacity:1;width:100%;height:100%}to{opacity:0;width:200%;height:200%}}.sound-playing{animation:.6s ease-in-out infinite alternate sound-pulse}@keyframes sound-pulse{0%{transform:scale(1)}to{transform:scale(1.05)}}.quiz-card{transition:all .2s cubic-bezier(.4,0,.2,1)}.quiz-card:hover:not(:disabled){transform:translateY(-4px)scale(1.03)}.quiz-card:active:not(:disabled){transform:translateY(0)scale(.97)}.quiz-correct{animation:.5s ease-in-out correct-pulse}@keyframes correct-pulse{0%{transform:scale(1)}30%{transform:scale(1.1)}60%{transform:scale(.95)}to{transform:scale(1)}}.quiz-wrong{animation:.4s ease-in-out wrong-shake}@keyframes wrong-shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-6px)}80%{transform:translate(6px)}}.sound-btn{transition:all .2s}.sound-btn:hover{box-shadow:0 12px 40px #ec489940}