/**
 * 右下角悬浮操作区（返回顶部 + 客服）
 * @author Telegram @okgeceo
 */

.ok-float-dock {
  position: fixed;
  right: calc(var(--space-6) + env(safe-area-inset-right, 0px));
  bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
  z-index: 9400;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  pointer-events: none;
}

.ok-float-dock > * {
  pointer-events: auto;
}

.ok-back-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid color-mix(in oklch, var(--border) 72%, transparent);
  border-radius: var(--radius-full);
  background: color-mix(in oklch, var(--background) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--foreground);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  transform: translateY(0.5rem);
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-snappy),
              background-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.ok-back-top[hidden] {
  display: none;
}

.ok-back-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.ok-back-top:hover {
  background: var(--background);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

@media (prefers-reduced-motion: reduce) {
  .ok-back-top {
    transition: opacity var(--duration-fast) var(--ease-out);
  }

  .ok-back-top:hover {
    transform: none;
  }
}