.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  background: #0b1119;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}