/**
 * Atlas canvas transitions. Activates only on canvas-owned pages
 * (templates/canvas.php). Native browser View Transitions API.
 *
 * Browser support: Chrome 126+, Safari 18.2+, Firefox behind a flag.
 * Unsupported browsers degrade to a normal page nav (no flash, no
 * JS error — the @view-transition rule is parsed and ignored).
 */

@view-transition {
  navigation: auto;
}

:root {
  --atlas-tx-fade:    320ms cubic-bezier(0.22, 1, 0.36, 1);
  --atlas-tx-settle:  520ms cubic-bezier(0.22, 1, 0.36, 1);
}

.atlas-skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 10000;
  padding: 0.65rem 0.85rem;
  border-radius: 0.35rem;
  background: #111;
  color: #fff;
  font: 600 0.95rem/1.2 system-ui, -apple-system, "Segoe UI", sans-serif;
  text-decoration: none;
  transform: translateY(calc(-100% - 2rem));
  transition: transform 150ms ease;
}

.atlas-skip-link:focus,
.atlas-skip-link:focus-visible {
  transform: translateY(0);
  outline: 3px solid #fff;
  outline-offset: 2px;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 320ms;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

.atlas-wordmark,
[data-atlas-role="wordmark"] {
  view-transition-name: atlas-wordmark;
}

.atlas-canvas {
  view-transition-name: atlas-canvas-root;
}

.atlas-nav {
  view-transition-name: atlas-nav;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1rem 1.5rem;
  align-items: center;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 0.95rem;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
}

.atlas-nav .atlas-block--link {
  color: inherit;
  text-decoration: none;
  padding: 0.25rem 0.6rem;
  border-radius: 0.3rem;
  transition: background 150ms cubic-bezier(0.22, 1, 0.36, 1);
}

.atlas-nav .atlas-block--link:hover {
  background: rgba(0, 0, 0, 0.06);
}

::view-transition-group(atlas-wordmark),
::view-transition-group(atlas-nav) {
  animation-duration: 520ms;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-reduced-motion: reduce) {
  @view-transition {
    navigation: none;
  }

  ::view-transition-old(root),
  ::view-transition-new(root),
  ::view-transition-group(atlas-wordmark),
  ::view-transition-group(atlas-nav) {
    animation: none !important;
  }
}