/* Clip the sliding tab so its off-screen position never widens the page. */
.back-to-top {
  position: fixed;
  right: 0;
  bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  z-index: 40;
  overflow: hidden;
  padding: 8px max(16px, env(safe-area-inset-right, 0px)) 8px 8px;
  pointer-events: none;
}

.back-to-top__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-width: 60px;
  min-height: 64px;
  padding: 8px;
  border: 4px solid var(--color-wood-deep);
  border-radius: 10px;
  color: var(--color-phosphor-bright);
  background: var(--color-screen);
  box-shadow: 0 0 0 2px var(--color-wood-highlight), inset 0 0 12px #0009;
  font: 700 9px/1.2 "PT Mono", monospace;
  letter-spacing: .04em;
  text-decoration: none;
  text-transform: uppercase;
  visibility: hidden;
  transform: translateX(calc(100% + max(16px, env(safe-area-inset-right, 0px)) + 8px));
  transition: transform 240ms cubic-bezier(.22, .75, .25, 1), visibility 0s linear 240ms;
}

.back-to-top.is-visible .back-to-top__link {
  visibility: visible;
  transform: translateX(0);
  pointer-events: auto;
  transition-delay: 0s;
}

.back-to-top__link:hover {
  color: var(--color-phosphor-bright);
  background: var(--color-screen-raised);
  text-decoration: none;
}

.sniper-active .back-to-top {
  visibility: hidden;
}

.sniper-active .back-to-top .back-to-top__link {
  visibility: hidden;
  pointer-events: none;
}

@media (max-width: 600px) {
  .back-to-top { bottom: calc(72px + env(safe-area-inset-bottom, 0px)); }
}

@media (prefers-reduced-motion: reduce) {
  .back-to-top__link { transition: none !important; }
}