/* One navigation scale for the portfolio, library, timeline, and reader. */
:root {
  --site-nav-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --site-nav-type: 400 14px/1.4 var(--site-nav-family);
  --site-nav-rule: #dedede;
}

.site-navigation-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  align-self: center;
  flex: none;
  gap: 12px;
  width: var(--site-content-width);
  min-width: 0;
  height: 64px;
  min-height: 64px;
  margin: 0 auto;
  padding: 0;
  border-bottom: 1px solid var(--site-nav-rule);
}
.site-header.navigation-shell {width: 100%; margin: 0}
/* Home's wrapper already supplies the shared page gutters. */
.folio > .site-navigation-header {width: 100%; margin-inline: 0}

.site-navigation-header .alan-signature,
#reader .reader-toolbar .alan-signature {
  flex: none;
  gap: 8px;
  min-height: 44px;
  padding: 0;
  color: var(--ink, #252525);
}
.site-navigation-header .alan-name,
#reader .reader-toolbar .alan-name {
  font: 500 16px/1.3 var(--site-nav-family);
  letter-spacing: -.025em;
}
.site-navigation-header .alan-mark,
#reader .reader-toolbar .alan-mark {width: 36px; height: 33px}

.site-navigation-header .site-navigation {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex: none;
  gap: 4px;
  margin: 0;
  padding: 0;
  font: var(--site-nav-type);
}
.site-navigation-header .site-navigation a {
  display: inline-flex;
  position: relative;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 4px;
  color: var(--ink, #252525);
  font: var(--site-nav-type);
  letter-spacing: 0;
  text-decoration: none;
  white-space: nowrap;
}
.site-navigation-header .site-navigation a::after {
  content: "";
  position: absolute;
  inset-inline: 4px;
  bottom: 6px;
  height: 1px;
  background: transparent;
}
.site-navigation-header .site-navigation a[aria-current="page"]::after {background: currentColor}
.site-navigation-header a:focus-visible,
.collection-header-tools button:focus-visible,
#reader .reader-toolbar .alan-signature:focus-visible,
#reader .reader-toolbar button:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
  border-radius: 3px;
  text-decoration: none;
}

/* Collection-specific controls keep their own row below the shared navigation. */
.collection-header-tools {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 4px 16px;
  min-height: 44px;
  margin-top: 8px;
}
.collection-header-tools .text-button,
.collection-header-tools .theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 44px;
  min-height: 44px;
  padding: 0 4px;
  font: var(--site-nav-type);
  letter-spacing: 0;
}
.collection-header-tools .text-button span {display: inline-flex; margin: 0; font: inherit}
.collection-header-tools .text-button svg,
.collection-header-tools .theme-toggle svg {flex: none; width: 18px; height: 18px}
.collection-header-tools .text-button svg {display: block}
.collection-header-tools .private-label {font: var(--site-nav-type); letter-spacing: 0}

/* Return to shelf is a navigation action, on the same scale as every other link. */
#reader .reader-toolbar {font-family: var(--site-nav-family); letter-spacing: 0}
#reader .reader-toolbar button {
  min-width: 44px;
  min-height: 44px;
  font: var(--site-nav-type);
  letter-spacing: 0;
}
#reader .reader-toolbar #close-reader span {font: inherit; letter-spacing: 0}
#reader .reader-toolbar .theme-compact {width: 44px; min-width: 44px}

[data-theme="night"] {--site-nav-rule: #393c3e}

@media (max-width: 360px) {
  .site-navigation-header .site-navigation {gap: 0}
  .site-navigation-header .site-navigation a {padding-inline: 0}
}
@media (hover: hover) {
  .site-navigation-header .site-navigation a:hover::after {background: currentColor}
}
@media (min-width: 681px) {
  .site-navigation-header {height: 72px; min-height: 72px; gap: 24px}
  .site-navigation-header .site-navigation {gap: 20px}
  .site-navigation-header .alan-mark,
  #reader .reader-toolbar .alan-mark {width: 42px; height: 38px}
}