.sg-back-to-top {
    position: fixed;
    bottom: 28px;
    left: 28px;
    z-index: 400;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background-color: var(--dark-thyme);
    color: var(--vanilla-cloud);
    border-radius: 50%;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all var(--duration-sm) var(--ease-out);
    box-shadow: var(--shadow-md);
}

.sg-back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.sg-back-to-top:hover {
    background-color: var(--smoked-mocha);
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .sg-back-to-top {
        bottom: 20px;
        left: 20px;
        width: 40px;
        height: 40px;
    }
}