#nkshbb-back-button {
    align-items: center;
    background: #fff;
    border: 1px solid var(--color_main);
    border-radius: 50%;
    box-shadow: var(--swl-box_shadow);
    color: var(--color_main);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    height: 52px;
    justify-content: center;
    letter-spacing: normal;
    line-height: 1;
    opacity: .75;
    overflow: hidden;
    text-align: center;
    transition: all .25s;
    width: 52px;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    font-size: 12px;
    font-weight: normal;
    text-decoration: none;
}

#nkshbb-back-button::before {
    content: "\e912";
    font-family: icomoon;
    font-size: 24px;
    font-style: normal;
}

#nkshbb-back-button:has(.nkshbb-text:not(:empty))::before {
    transform: translateY(6px);
}

#nkshbb-back-button:hover {
    opacity: 1;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

#nkshbb-back-button .nkshbb-text {
    display: block;
    word-break: break-all;
    line-height: 1.2;
    padding: 2px;
    margin-bottom: 10px;
}

@media (max-width: 768px) {
    #nkshbb-back-button {
        bottom: 15px;
        right: 15px;
        width: 48px;
        height: 48px;
        font-size: 11px;
    }
}

#nkshbb-back-button.nkshbb-scrolling {
    animation: nkshbb-scroll 0.6s ease-in-out;
}

.nkshbb-text {
    font-size: 10px;
    font-weight: 400;
    text-align: center;
    line-height: 1.2;
    padding: 2px;
    word-break: break-all;
}

@keyframes nkshbb-scroll {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.9);
    }
    100% {
        transform: scale(1);
    }
}