.scroll-up {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 200;
  display: flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0;
  color: #fff;
  background: #0D0D0C;
  border: 1px solid #2C2C2A;
  border-radius: 50%;
  box-shadow: 0 8px 24px rgba(13, 13, 12, .18);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  cursor: pointer;
  transform: translateY(10px);
  transition: opacity .25s, transform .25s, background-color .15s, visibility 0s linear .25s;
}

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

.scroll-up:focus-visible {
  outline: 3px solid #E8621A;
  outline-offset: 3px;
}

@media (hover: hover) {
  .scroll-up:hover { background: #E8621A; }
}

@media (max-width: 639px) {
  .scroll-up { right: 20px; bottom: 20px; }
  .scroll-up.lifted { bottom: 76px; }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-up,
  .scroll-up.visible {
    transform: none;
    transition: none;
  }
}