/* BACK TO TOP */
.back-to-top {
    position: fixed; bottom: 32px; right: 32px;
    width: 44px; height: 44px;
    background: #000000; border: 1px solid rgba(255,255,255,0.35);
    color: #ffffff; border-radius: 0;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; opacity: 0; visibility: hidden;
    transition: all 0.3s var(--ease-out); z-index: 1000;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: #ffffff; color: #000000; border-color: #ffffff; transform: translateY(-4px); }