.back-to-top {
  position: fixed;
  right: 30px;
  bottom: 30px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, #a115e2, #1e9ee7);
  color: #fff;
  font-size: 24px;
  cursor: pointer;

  display: flex;
  align-items: center;
  justify-content: center;

  box-shadow: 0 12px 25px rgba(74, 177, 26, 0.35);

  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
}

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

.back-to-top:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 18px 35px rgba(129, 42, 211, 0.45);
}