.dsh-scroll-top {
  position: fixed;
  left: max(14px, env(safe-area-inset-left, 0px));
  bottom: max(14px, env(safe-area-inset-bottom, 0px));
  z-index: 89;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  padding: 0;
  border: 2px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--blue);
  box-shadow: 0 5px 0 rgba(0, 0, 0, .18), 0 10px 22px rgba(0, 0, 0, .2);
  font: 900 20px/1 system-ui, -apple-system, "Segoe UI", sans-serif;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 180ms ease, transform 180ms ease, visibility 0s linear 180ms;
}

.dsh-scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
  transition-delay: 0s;
}

.dsh-scroll-top:hover {
  transform: translateY(-2px);
}

.dsh-scroll-top:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}

@media (max-width: 520px) {
  .dsh-scroll-top {
    width: 40px;
    height: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .dsh-scroll-top,
  .dsh-scroll-top.is-visible {
    transition: none;
  }

  .dsh-scroll-top,
  .dsh-scroll-top:hover {
    transform: none;
  }
}