/* 全站页面切换过渡：上下滚动式换页 */
.page-transition {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: grid;
  place-items: center;
  background: var(--page-transition-bg, #06070b);
  visibility: hidden;
  pointer-events: none;
  transform: translate3d(0, 100%, 0);
  transition: transform 0.36s cubic-bezier(0.76, 0, 0.24, 1), visibility 0.36s;
  will-change: transform;
}

.page-transition.is-from-top {
  transform: translate3d(0, -100%, 0);
}

.page-transition.is-active {
  visibility: visible;
  pointer-events: auto;
  transform: translate3d(0, 0, 0);
}

html.page-leaving,
html.page-leaving body {
  overflow: hidden;
}

.page-transition-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  color: color-mix(in srgb, var(--page-transition-accent, #a9b8ff) 72%, #ffffff);
  font-family: var(--mono, "Cascadia Code", Consolas, monospace);
  font-size: 9px;
  letter-spacing: 0.12em;
}

.page-transition-bar {
  width: 72px;
  height: 1px;
  overflow: hidden;
  background: color-mix(in srgb, var(--page-transition-accent, #a9b8ff) 18%, transparent);
}

.page-transition-bar::after {
  content: "";
  display: block;
  width: 38%;
  height: 100%;
  background: var(--page-transition-accent, #a9b8ff);
  animation: pageTransitionBar 0.8s ease-in-out infinite;
}

@keyframes pageTransitionBar {
  0% { transform: translateX(-110%); }
  100% { transform: translateX(290%); }
}

/* 新页面从下方 / 上方柔和进入 */
html.page-ready body {
  animation: pageEnterFade 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

html.page-enter-down body {
  animation: pageEnterDown 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

html.page-enter-up body {
  animation: pageEnterUp 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes pageEnterFade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pageEnterDown {
  from { opacity: 0; transform: translateY(26px); }
  to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes pageEnterUp {
  from { opacity: 0; transform: translateY(-26px); }
  to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .page-transition { transition: none; }
  html.page-ready body,
  html.page-enter-down body,
  html.page-enter-up body { animation: none; }
  .page-transition-bar::after { animation: none; width: 100%; }
}