/* Shared by current pages and preserved archives; geometry stays in the theme. */
html #page-header:not(.nav-fixed) > #nav,
html #page-header.nav-fixed > #nav,
html[data-theme='dark'] #page-header:not(.nav-fixed) > #nav,
html[data-theme='dark'] #page-header.nav-fixed > #nav {
  background: transparent;
  border-bottom: 0;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

html #page-header.nav-fixed > #nav {
  background: rgba(255, 255, 255, .8);
  box-shadow: 0 5px 6px -5px rgba(133, 133, 133, .6);
}

html[data-theme='dark'] #page-header.nav-fixed > #nav {
  background: rgba(18, 20, 25, .8);
  box-shadow: 0 5px 6px -5px rgba(133, 133, 133, .6);
}

html #page-header #nav a:focus-visible,
html #page-header #nav .site-page:focus-visible {
  outline: 2px solid #49b1f5;
  outline-offset: 4px;
}