/* Back to Top Button */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: #1d90c9;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: #54b1cf;
    transform: translateY(-3px);
}

.back-to-top i {
    font-size: 30px;
    color: #fff;
}

@media screen and (max-width: 768px) {
    .back-to-top {
        width: 35px;
        height: 35px;
        bottom: 20px;
        right: 20px;
    }

    .back-to-top i {
        font-size: 24px;
    }
}

@media screen and (max-width: 480px) {
    .back-to-top {
        width: 30px;
        height: 30px;
        bottom: 15px;
        right: 15px;
    }

    .back-to-top i {
        font-size: 20px;
    }
}