:root {
  --overlay-text-size: 1.25rem;
  --overlay-unfocused-opacity: 0.7;
  --overlay-unfocused-blur: 5px;
  --content-overlay-focus-blur: 25px;
  --overlay-focus-transition: 300ms;
}

.site-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  grid-template-columns: 15vw 15vw minmax(0, 1fr);
  box-sizing: border-box;
  color: var(--overlay-foreground, inherit);
  pointer-events: none;
}

.overlay-left {
  grid-column: 1;
}

.overlay-right {
  grid-column: 3;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-width: 0;
  min-height: 0;
}

.overlay-header {
  grid-row: 1;
}

.overlay-nav {
  display: flex;
  flex-direction: column;
  gap: 5vh;
  margin-block-start: 30vh;
  margin-inline-start: 1vw;
  pointer-events: auto;
}

.project-overlay-nav {
  max-height: 65vh;
  overflow-y: auto;
  scrollbar-width: none;
}

.project-overlay-nav::-webkit-scrollbar {
  display: none;
}

.overlay-nav a {
  font-size: calc(var(--overlay-text-size) + var(--nav-growth, 0rem));
  font-weight: var(--nav-weight, 400);
}

.overlay-nav a[aria-current] {
  --nav-growth: 0.5rem;
  --nav-weight: 700;
}

.overlay-nav a,
.overlay-name,
.overlay-info > *,
.overlay-footer > *,
.project-overlay-home {
  opacity: 1;
  filter: blur(0);
  transition:
    opacity var(--overlay-focus-transition) ease-in-out,
    filter var(--overlay-focus-transition) ease-in-out;
}

.overlay-name,
.overlay-info,
.overlay-footer,
.project-overlay-home {
  font-size: var(--overlay-text-size);
}

.overlay-name,
.overlay-info > *,
.overlay-footer > * {
  pointer-events: auto;
}

html.focus-on-content .overlay-nav a:not([aria-current]),
html.focus-on-content .overlay-name,
html.focus-on-content .overlay-info > *,
html.focus-on-content .overlay-footer > *,
html.focus-on-content .project-overlay-home {
  opacity: var(--overlay-unfocused-opacity);
  filter: blur(var(--overlay-unfocused-blur));
}

html.focus-on-content .overlay-nav a[aria-current],
html.focus-on-overlay .overlay-nav a,
html.focus-on-overlay .overlay-name,
html.focus-on-overlay .overlay-info > *,
html.focus-on-overlay .overlay-footer > *,
html.focus-on-overlay .project-overlay-home {
  opacity: 1;
  filter: blur(0);
}

/* Keep filters off the document-height scroll container. Only the viewport
   stage needs a composited surface, particularly with Safari's sticky layers. */
.block-stage,
.project-page-stage {
  filter: blur(0);
  transition: filter var(--overlay-focus-transition, 500ms) ease-in-out;
}

html.focus-on-overlay .block-stage,
html.focus-on-overlay .project-page-stage {
  filter: blur(var(--content-overlay-focus-blur));
}

html.overlay-always-clear .site-overlay .overlay-nav a,
html.overlay-always-clear .site-overlay .overlay-name,
html.overlay-always-clear .site-overlay .overlay-info > *,
html.overlay-always-clear .site-overlay .overlay-footer > *,
html.overlay-always-clear .site-overlay .project-overlay-home {
  opacity: 1;
  filter: none;
}

html.overlay-always-clear .block-stage,
html.overlay-always-clear .project-page-stage {
  filter: none;
}

.overlay-info {
  grid-row: 2;
  justify-self: end;
  box-sizing: border-box;
  width: 30vw;
  margin-inline-end: 20vw;
  min-height: 0;
  overflow: auto;
}

.overlay-footer {
  grid-row: 3;
  pointer-events: auto;
}

@media print {
  .site-overlay {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .overlay-nav a,
  .overlay-name,
  .overlay-info > *,
  .overlay-footer > *,
  .project-overlay-home,
  .block-stage,
  .project-page-stage {
    transition-duration: 0ms;
  }
}