/* =========================
   Scroll to top button
========================= */
#scrollToTop {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: #1195FE;
    color: #fff;
    border: none;
    font-size: 24px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    box-shadow: 0 6px 18px rgba(17,149,254,.35);
    transition: opacity .25s ease, transform .25s ease;
    z-index: 9999;
}

/* viditelné */
#scrollToTop.is-visible {
    opacity: 1;
    pointer-events: auto;
}

/* hover */
#scrollToTop:hover {
    transform: translateY(-3px);
    background: #0e7fe0;
}

/* mobil – o kousek výš kvůli liště */
@media (max-width: 768px) {
    #scrollToTop {
        bottom: 80px;
    }
}