/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--ps-blue), var(--ps-blue-dark));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.2rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-base);
  z-index: 999;
  box-shadow: 0 5px 20px rgba(0, 111, 205, 0.3);
}

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

.back-to-top:hover {
  transform: translateY(-5px);
  color: white;
  box-shadow: var(--shadow-glow);
}