.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: #3669a3;
  border: none;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(1rem);
  transition:
    opacity 0.3s ease,
    visibility 0.3s ease,
    transform 0.3s ease,
    background-color 0.3s ease;
}

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

.back-to-top:hover {
  background: #274a7d;
}

.back-to-top-icon {
  display: block;
  width: 24px;
  height: 24px;
}

@media screen and (min-width: 768px) {
  .back-to-top {
    width: 60px;
    height: 60px;
    bottom: 2rem;
    right: 2rem;
  }

  .back-to-top-icon {
    width: 32px;
    height: 32px;
  }
}