/* Back to Top Button */
#htr-back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: #0f766e;
    color: #ffffff;
    border-radius: 50%;
    display: none; /* hidden by default, toggled via JS */
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    z-index: 9999;
    transition: opacity 0.3s ease, background-color 0.2s ease, transform 0.2s ease;
    opacity: 0;
    text-decoration: none;
}

#htr-back-to-top.show {
    display: flex;
    opacity: 1;
}

#htr-back-to-top:hover {
    background: #115e59;
    transform: translateY(-2px);
}

#htr-back-to-top a {
    color: #ffffff;
    text-decoration: none;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    border-radius: 50%;
}