@media (max-width: 760px) {
  .back-top {
    position: fixed;
    z-index: 41;
    right: max(14px, env(safe-area-inset-right));
    bottom: calc(104px + env(safe-area-inset-bottom));
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 14px;
    border: 1px solid rgba(116, 155, 239, .42);
    border-radius: 999px;
    background: rgba(7, 19, 43, .94);
    box-shadow: 0 10px 24px rgba(7, 19, 43, .22);
    color: #fff;
    font-size: 11px;
    font-weight: 800;
    pointer-events: auto;
    text-decoration: none;
    touch-action: manipulation;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: opacity .2s ease, transform .2s ease;
    visibility: hidden;
  }
  .back-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); visibility: visible; }
  .back-top.is-visible:active { transform: translateY(2px); }
  .back-top:focus-visible { outline: 3px solid #a8e9dc; outline-offset: 3px; }
}