.fc-back-to-top {
  position: fixed;
  z-index: 45;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  padding: 0;
  border: 1px solid rgba(99, 230, 255, 0.64);
  border-radius: 50%;
  background: rgba(7, 18, 38, 0.88);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  color: var(--fc-cyan);
  font-size: 1.45rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(14px);
  transition: opacity 180ms ease, transform 180ms ease, background-color 180ms ease;
}

.fc-back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.fc-back-to-top:hover {
  background: rgba(99, 230, 255, 0.18);
  color: #fff;
}

.fc-back-to-top:focus-visible {
  outline: 3px solid var(--fc-gold);
  outline-offset: 3px;
}

@media (max-width: 700px) {
  .fc-back-to-top {
    width: 46px;
    height: 46px;
  }
}