.esun-back-to-top {
    position: fixed;
    right: 28px;
    bottom: 90px;
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    padding: 0;
    border: 1px solid #17a957;
    border-radius: 50%;
    background: #17a957;
    color: #fff;
    box-shadow: 0 6px 18px rgba(23, 169, 87, .25);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity .2s ease, visibility .2s ease, transform .2s ease, background-color .15s ease;
}

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

.esun-back-to-top:hover,
.esun-back-to-top:focus-visible {
    background: #128c48;
    color: #fff;
}

.esun-back-to-top:focus-visible {
    outline: 3px solid rgba(23, 169, 87, .25);
    outline-offset: 3px;
}

@media (max-width: 767px) {
    .esun-back-to-top {
        right: 16px;
        bottom: 90px;
        width: 42px;
        height: 42px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .esun-back-to-top {
        transition: none;
    }
}