/* One compact shell; illustrated chapter sections can opt into the wide canvas. */
:root {
  --site-shell-width: 56rem;
  --site-shell-padding: 1.5rem;
  --site-row-media: 9rem;
  --site-row-gap: 2.5rem;
}

html {
  scrollbar-gutter: stable;
  overflow-y: scroll;
}

.site-shell {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--site-shell-width);
  margin-inline: auto;
  padding-inline: var(--site-shell-padding);
}

.page-shell { padding-top: 2rem; }
body > [data-section] { scroll-margin-top: 49px; }

.landing-row {
  position: relative;
  display: grid;
  grid-template-columns: var(--site-row-media) minmax(0, 1fr);
  gap: var(--site-row-gap);
  align-items: start;
  min-height: 11rem;
}

.landing-list > article:first-child { padding-top: 0; }
.landing-list > article > .landing-row { margin-inline: 0; padding-inline: 0; }
.landing-list .landing-row > * { align-self: start; }
.landing-list .landing-row > :first-child {
  display: grid;
  place-items: center;
  width: var(--site-row-media);
  height: var(--site-row-media);
}
.landing-list .landing-row:hover { background: #fafafa; }
.row-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: baseline;
  margin-bottom: .25rem;
}
.row-title {
  min-width: 0;
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: -.025em;
}
.row-meta {
  color: #737373;
  font: 400 .75rem/1.5 'JetBrains Mono', ui-monospace, monospace;
  white-space: nowrap;
}

.story-copy.site-shell {
  width: 100%;
  max-width: var(--site-shell-width);
  padding-inline: var(--site-shell-padding);
}
.story-copy.site-shell.is-section-open {
  width: calc(100% - 2 * clamp(1.5rem, 4vw, 4rem));
  max-width: 1720px;
  padding-inline: 0;
}
.story-copy > .chapter-intro {
  max-width: calc(var(--site-shell-width) - 2 * var(--site-shell-padding));
  margin-inline: auto;
}
@media screen {
  .story-copy.is-section-open > .chapter-intro { display: none; }
  .story-copy.is-section-open > [data-reader-section] > .section-heading-shell {
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
  }
}

@media (max-width: 767px) {
  :root { --site-row-media: 5rem; --site-row-gap: 1rem; }
  .landing-row { min-height: 0; }
  .home-intro { grid-template-columns: 1fr; gap: 2rem; }
}

.site-nav,
.reader-navigation {
  view-transition-name: site-navigation;
}

.reader-navigation {
  position: sticky;
  top: 0;
  z-index: 30;
  height: 49px;
  background: rgba(255, 255, 255, .96);
}

.reader-navigation-inner {
  display: flex;
  align-items: center;
  box-sizing: border-box;
  width: 100%;
  max-width: var(--site-shell-width);
  height: 48px;
  margin-inline: auto;
  padding-inline: var(--site-shell-padding);
}

.reader-navigation[data-reader-layout="wide"]:has(~ main .story-copy.is-section-open) .reader-navigation-inner {
  width: calc(100% - 2 * clamp(1.5rem, 4vw, 4rem));
  max-width: 1720px;
  padding-inline: 0;
}

.reader-navigation a:focus-visible {
  outline: 2px solid #525252;
  outline-offset: 4px;
  border-radius: .2rem;
}

.reader-navigation ~ main [id],
.reader-navigation ~ article [id] {
  scroll-margin-top: 4.5rem;
}
.story-copy .section-heading-shell { scroll-margin-top: 4.5rem; }

@view-transition {
  navigation: auto;
}

/* Fade between finished layouts; never stretch or slide the reading column. */
::view-transition-group(root),
::view-transition-group(site-navigation) {
  animation: none;
}

::view-transition-old(root),
::view-transition-old(site-navigation) {
  animation: page-fade-out 140ms ease-out both;
  mix-blend-mode: normal;
}

::view-transition-new(root),
::view-transition-new(site-navigation) {
  animation: page-fade-in 140ms ease-out both;
  mix-blend-mode: normal;
}

@keyframes page-fade-out { to { opacity: 0; } }
@keyframes page-fade-in { from { opacity: 0; } }

@media (prefers-reduced-motion: reduce) {
  @view-transition { navigation: none; }
  html { scroll-behavior: auto !important; }
}

@media print {
  .reader-navigation { display: none; }
}