/* Shared back-to-top appearance. */
.back-to-top {
  position: fixed;
  right: clamp(16px, 2vw, 32px);
  bottom: clamp(16px, 2vw, 32px);
  z-index: 1100;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  padding: 0;
  border: 2px solid #ffffff;
  border-radius: 50%;
  background: #2dadaf;
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
  font: 700 30px/1 Arial, sans-serif;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms;
}

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

.back-to-top:hover {
  background: #238e93;
  transform: translateY(-2px);
}

.back-to-top:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 3px;
}

@media (max-width: 480px) {
  .back-to-top {
    width: 46px;
    height: 46px;
    font-size: 27px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .back-to-top {
    transition: none;
  }
}