/* Keep both navigation and support reachable in the lower-right corner. */
.back-to-top {
  position: fixed;
  right: calc(96px + env(safe-area-inset-right, 0px));
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  z-index: 999997;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  width: 64px;
  height: 60px;
  padding: 6px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: linear-gradient(145deg, #191b32, #101826) padding-box,
    linear-gradient(135deg, #a78bfa, #67e8d4) border-box;
  color: #f7f7ff;
  box-shadow: 0 4px 20px #090d2440;
  font-family: inherit;
  cursor: pointer;
  touch-action: manipulation;
  transition: transform .2s ease, box-shadow .2s ease;
}
.back-to-top svg { width: 21px; height: 21px; flex-shrink: 0; }
.back-to-top span { font-family: inherit; font-size: 11px; font-weight: 600; line-height: 1.2; white-space: nowrap; }
@media (hover: hover) {
  .back-to-top:hover { transform: translateY(-3px); box-shadow: 0 6px 24px #8876ed55; }
}
.back-to-top:focus-visible { outline: 3px solid #67e8d4; outline-offset: 4px; }
@media (max-width: 480px) {
  .back-to-top {
    right: calc(91px + env(safe-area-inset-right, 0px));
    bottom: calc(15px + env(safe-area-inset-bottom, 0px));
  }
  /* The mobile support view is full-screen; do not cover its message input. */
  body:has(.timux-chat-window.open) .back-to-top { visibility: hidden; }
}
@media (prefers-reduced-motion: reduce) {
  .back-to-top { transition: none; }
  .back-to-top:hover { transform: none; }
}