#scrollToTop {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease-in-out, opacity 0.3s;
    z-index: 1000;
}

/* Effet de rebond au hover */
#scrollToTop:hover {
    transform: scale(1.1);
}

/* Animation d'apparition */
.fade-in {
    animation: fadeIn 0.5s ease-in-out forwards;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(20px);
    }
}