.site-scroll-top {
  position: fixed;
  right: 16px;
  bottom: var(--site-fab-bottom);
  z-index: 350;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid var(--border, #30363d);
  border-radius: 50%;
  background: #1a1a1a;
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.22);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

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

.site-scroll-top:hover {
  transform: translateY(-2px) scale(1.04);
}

.site-scroll-top.is-visible:hover {
  transform: translateY(-2px) scale(1.04);
}

.fab-dock .site-scroll-top.fab-dock__btn--top,
.fab-dock #scrollTopBtn.fab-dock__btn--top {
  position: relative;
  right: auto;
  bottom: auto;
}

[data-theme="light"] .site-scroll-top:not(.fab-dock__btn) {
  background: #1c1917;
  border-color: #d6d3d1;
  color: #ffffff;
}

@media (prefers-reduced-motion: reduce) {
  .site-scroll-top {
    transition: opacity 0.15s ease, visibility 0.15s ease;
  }
}