:root {
  --route-paper: var(--paper, #f8f7f3);
}

body {
  --route-axis: -1;
  overflow-x: hidden;
}

body > .shell,
body > .page-shell {
  position: relative;
  z-index: 1;
  will-change: transform, opacity;
}

.route-preview {
  position: fixed;
  inset: 0;
  z-index: 80;
  overflow: hidden;
  background: var(--route-paper);
  pointer-events: none;
  transform: translateX(calc(var(--route-axis) * -100%));
  transition: transform .52s cubic-bezier(.76, 0, .24, 1);
}

.route-preview.is-active { transform: translateX(0); }

.route-preview iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

body.route-leave > .shell,
body.route-leave > .page-shell {
  opacity: 1;
  transform: translateX(calc(var(--route-axis) * 100%));
  transition: transform .52s cubic-bezier(.76, 0, .24, 1);
}

body.route-enter > .shell,
body.route-enter > .page-shell {
  animation: route-page-enter .56s cubic-bezier(.2, .75, .25, 1) both;
}

@keyframes route-page-enter {
  from { opacity: 1; transform: translateX(calc(var(--route-axis) * -100%)); }
  to { opacity: 1; transform: translateX(0); }
}

@media (prefers-reduced-motion: reduce) {
  body.route-leave > .shell,
  body.route-leave > .page-shell,
  body.route-enter > .shell,
  body.route-enter > .page-shell {
    animation: none !important;
    transition: none !important;
  }
}

@media (max-width: 760px) {
  html,
  body {
    overflow-x: clip;
    overflow-y: visible;
  }

  body > .shell,
  body > .page-shell {
    will-change: auto;
    transform: none !important;
    opacity: 1 !important;
  }

  .route-preview {
    display: none !important;
  }

  body.route-leave > .shell,
  body.route-leave > .page-shell,
  body.route-enter > .shell,
  body.route-enter > .page-shell {
    animation: none !important;
    transition: none !important;
    transform: none !important;
    opacity: 1 !important;
  }
}