/* Hint Animation */
@keyframes hintPulse {
    0% { background-color: rgba(46, 204, 113, 0.2); border: 1px solid #2ecc71; }
    50% { background-color: rgba(46, 204, 113, 0.5); border: 1px solid #2ecc71; }
    100% { background-color: rgba(46, 204, 113, 0.2); border: 1px solid #2ecc71; }
}

.line-hint {
    animation: hintPulse 1.5s infinite;
    border-radius: 4px;
}