/* Animation Styles */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-15px);
    }
    60% {
        transform: translateY(-10px);
    }
}

@keyframes sparkle {
    0% {
        filter: brightness(1);
    }
    50% {
        filter: brightness(1.3);
    }
    100% {
        filter: brightness(1);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in forwards;
}

.fade-out {
    animation: fadeOut 0.5s ease-out forwards;
}

.pulse {
    animation: pulse 0.5s ease-in-out;
}

.bounce {
    animation: bounce 0.8s ease;
}

.sparkle {
    animation: sparkle 1s ease-in-out;
}

/* Correct Answer Animation */
.correct-answer {
    border-color: #4a8b2c !important;
    animation: pulse 0.5s ease-in-out, sparkle 1s ease-in-out;
}

/* Incorrect Answer Animation */
.incorrect-answer {
    border-color: #d9534f !important;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(5px);
    }
}