/**
 * Back to Top button - matches site theme (cyan gradient, loba design)
 */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(200.98deg, rgb(45, 204, 211) 20%, rgb(255, 0, 255) 150%);
  color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(45, 204, 211, 0.35);
  text-decoration: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(1rem);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, box-shadow 0.25s ease;
}

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

.back-to-top:hover {
  color: #fff;
  box-shadow: 0 6px 24px rgba(45, 204, 211, 0.5);
  transform: translateY(-2px);
}

.back-to-top:active {
  transform: translateY(0);
}

.back-to-top .icon-arrow {
  display: flex;
  transform: rotate(180deg);
  font-size: 1.125rem;
}