/* ============================================
   애니메이션
   ============================================ */

.shake {
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-10px); }
    20%, 40%, 60%, 80% { transform: translateX(10px); }
}

.line-clear-effect {
    animation: flash 0.3s;
}

@keyframes flash {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.controls-info {
    margin-top: 2rem;
    padding: 1rem;
    background: rgba(0,0,0,0.3);
    border-radius: 10px;
    font-size: 0.9rem;
}