/* OK7JN back-to-top (FLOATWRAP v9) */
button#backToTop.back-to-top{
  position: fixed;
  right: var(--btt-right, 14px); /* default: edge of viewport */
  bottom: var(--btt-bottom, calc(18px + env(safe-area-inset-bottom, 0px) + 52px));
  width: 46px;
  height: 46px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.25);
  background: rgba(0,0,0,.45);
  color: #fff;
  font-size: 22px;
  line-height: 44px;
  text-align: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  z-index: 999999;
}
button#backToTop.back-to-top:hover{ background: rgba(0,0,0,.65); transform: translateY(-1px); }
button#backToTop.back-to-top.is-visible{ opacity: 1; pointer-events: auto; }