/* 轻量动效层：页面转场 + 滚动进入，不引入前端框架 */
@view-transition {
  navigation: auto;
}

::view-transition-old(root) {
  animation: ui-fade-out 0.18s ease both;
}

::view-transition-new(root) {
  animation: ui-fade-in 0.3s ease both;
}

@keyframes ui-fade-out {
  to { opacity: 0; }
}

@keyframes ui-fade-in {
  from { opacity: 0; }
}

html {
  scroll-behavior: smooth;
}

.ui-reveal {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 0.7s cubic-bezier(0.2, 0.8, 0.2, 1),
    transform 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
  transition-delay: var(--ui-delay, 0ms);
}

.ui-reveal.ui-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ui-reveal,
  .ui-reveal.ui-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
  }
}