.back-to-top {
  position: fixed;
  bottom: 1.25rem;
  left: 1.25rem;
  z-index: 900;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  background: #8a0707;
  color: #fff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: transform 0.2s ease, background 0.2s ease;
}

.back-to-top:hover {
  transform: scale(1.06);
  background: #6a0505;
}

body.darkmode .back-to-top {
  background: #ff4040;
  color: #111;
}

body.darkmode .back-to-top:hover {
  background: #e63a3a;
}

[dir="rtl"] .back-to-top {
  left: auto;
  right: 1.25rem;
}