/* SHUIKE universal page transition.
   A full-viewport veil is the only moving part: the current document fades
   under it, then the destination is revealed as the veil fades away. The veil
   follows the active day/night skin (black at night, the page's paper tone by
   day), so it never flashes the wrong background between themes.
   The cover lives on <html> so it can be painted before <body> is parsed.
   Timings and easing are owned by js/page-transition.js; these rules supply
   the layers, the theme colours and the no-script-safe background. */

:root {
  --spt-veil: #000;
  --spt-z-index: 2147483000;
}

html[data-theme="light"] {
  --spt-veil: #e9e9ec;
}

html.spt-leaving,
html.spt-entering {
  background: var(--spt-veil);
  overscroll-behavior: none;
}

html.spt-leaving body {
  cursor: progress;
}

.spt-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--spt-z-index);
  width: 100%;
  height: 100%;
  margin: 0;
  border: 0;
  background: var(--spt-veil);
  opacity: 1;
  pointer-events: auto;
  touch-action: none;
  overscroll-behavior: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  contain: strict;
  will-change: opacity;
  transform: translateZ(0);
}

.spt-overlay[data-phase="out"] {
  cursor: progress;
}

/* Belt-and-braces only: JavaScript drives the fade with WAAPI and its own
   fallback. If a future browser path uses the class instead, keep it short. */
@media (prefers-reduced-motion: reduce) {
  .spt-overlay {
    transition-duration: 1ms !important;
  }
}