.profile-card {
  margin-bottom: 72px;
}

.site-back-top {
  position: fixed;
  right: 38px;
  bottom: 54px;
  z-index: 9999;
  width: 62px;
  height: 62px;
  border: 0;
  border-radius: 50%;
  background: rgba(40, 40, 40, 0.9);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 14px;
  line-height: 1;
  letter-spacing: 0.02em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease, background 0.2s ease;
}

.site-back-top::before {
  content: "";
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-bottom: 7px solid #fff;
}

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

.site-back-top:hover {
  background: rgba(0, 0, 0, 0.92);
}

@media (max-width: 768px) {
  .profile-card {
    margin-bottom: 52px;
  }

  .site-back-top {
    right: 18px;
    bottom: 24px;
    width: 52px;
    height: 52px;
    font-size: 12px;
  }
}