/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-blue-dark);
  transform: translateY(-6px) scale(1.03);
  box-shadow: 0 12px 24px rgba(0, 96, 156, 0.25);
}

.back-to-top:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px rgba(0, 96, 156, 0.25), 0 12px 24px rgba(0, 96, 156, 0.25);
}