.back-top {
  position: fixed;
  left: 18px;
  bottom: 92px;
  z-index: 60;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 999px;
  background: #07824f;
  color: #fff;
  font: 900 24px/1 Inter, Arial, sans-serif;
  box-shadow: 0 16px 32px rgba(6, 77, 47, 0.28);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease, background 0.18s ease;
}

.back-top:hover,
.back-top:focus-visible {
  background: #064d2f;
  transform: translateY(10px);
}

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

@media (max-width: 680px) {
  .back-top {
    left: 14px;
    bottom: 82px;
    width: 48px;
    height: 48px;
    font-size: 22px;
  }
}