.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 30px;
    z-index: 99999;
    width: 46px;
    height: 46px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    background: rgba(50, 50, 50, 0.7);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, background 0.3s ease;
    padding: 0;
}

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

.back-to-top:hover {
    background: rgba(50, 50, 50, 0.9);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
    fill: #fff;
}

@media (max-width: 767px) {
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 24px;
        right: 18px;
    }

    .back-to-top svg {
        width: 18px;
        height: 18px;
    }
}