:root {
  --ui-font-sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  --ui-font-serif: Georgia, "Songti SC", serif;
  --ui-radius-sm: 8px;
  --ui-radius-md: 12px;
  --ui-radius-lg: 18px;
  --ui-focus: #dca23c;
  --ui-accent: #3974d8;
  --ui-accent-strong: #285caa;
  --ui-motion-fast: 160ms;
}

:root[data-theme="dark"],
:root[data-ui-family="lab"] {
  --ui-focus: #ffd166;
  --ui-accent: #75b7ff;
  --ui-accent-strong: #65d6b1;
}

:where(a, button, select, input, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--ui-focus);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}