/* 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;
}

/* Native buttons retain the theme's event targets and visual style. */
#nav button.site-page {
  appearance: none;
  border: 0;
  border-radius: 6px;
  background: transparent;
  font: inherit;
  font-size: .78em;
  color: var(--light-grey);
  cursor: pointer;
}
html #page-header.nav-fixed #nav button.site-page,
html #page-header.not-top-img #nav button.site-page { color: var(--font-color); }
@media screen and (max-width: 768px) {
  /* Preserve hero geometry; darken busy cover imagery behind real text. */
  #page-header:not(.not-top-img)::before {
    background: linear-gradient(180deg, rgba(0,0,0,.38), rgba(0,0,0,.28) 40%, rgba(0,0,0,.65));
  }
  #page-header:not(.not-top-img):not(.nav-fixed) #nav .site-name,
  #page-header:not(.not-top-img):not(.nav-fixed) #nav .site-page,
  #page-header #site-title,
  #page-header #site-subtitle,
  #page-header #post-info { text-shadow: 0 2px 5px rgba(0,0,0,.8); }
  #page-header.post-bg #post-info .post-title {
    display: block;
    overflow: visible;
    font-size: clamp(24px, 6.7vw, 28px);
    line-height: 1.35;
    overflow-wrap: anywhere;
  }
  #page-header.post-bg #post-meta { font-size: 12px; line-height: 1.8; color: #fff; }
  #page-header.post-bg #post-meta a { color: #fff; }
  #page-header.post-bg #post-meta > .meta-firstline,
  #page-header.post-bg #post-meta > .meta-secondline { display: block; }
  #page-header.post-bg #post-meta .post-meta-date { display: flex; flex-wrap: wrap; gap: 0 8px; }
  #page-header.post-bg #post-meta .post-meta-date > .post-meta-separator,
  #page-header.post-bg #post-meta .meta-firstline > span.post-meta-categories > .post-meta-separator:first-child { display: none; }
  #page-header.post-bg #post-meta .post-meta-created,
  #page-header.post-bg #post-meta .post-meta-updated,
  #page-header.post-bg #post-meta time { white-space: nowrap; }
  #page-header.post-bg #post-meta .meta-secondline > .post-meta-separator:first-child { display: none; }
  #nav #blog-info { min-width: 0; }
  #nav #menus { flex-shrink: 0; display: flex; align-items: center; }
  #nav #search-button, #nav #toggle-menu { padding: 0; }
  #nav #search-button > button, #nav #toggle-menu > button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    padding: 0;
    font-size: 18px;
    touch-action: manipulation;
  }
}