/* ===========================
   Back to Top Button
   =========================== */
.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 999;
  display: none; /* başlangıçta gizli */
  background: rgba(0, 0, 0, 0.7); /* şeffaf dark */
  color: #fff;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.2rem;
  transition: all 0.3s ease;
}

.back-to-top:hover {
  background: rgba(217, 4, 4, 0.9); /* kırmızı hover */
  color: #fff;
  transform: translateY(-3px);
}