/* Fixed frosted site header. */
html {
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  padding-top: calc(var(--header-h) + 3px);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgb(var(--bg-elevated) / .72);
  -webkit-backdrop-filter: blur(18px) saturate(135%);
  backdrop-filter: blur(18px) saturate(135%);
  box-shadow: 0 5px 18px rgb(var(--shadow) / .14);
  transition: background-color .18s ease, box-shadow .18s ease;
}

.site-header.is-scrolled {
  background: rgb(var(--bg-elevated) / .84);
  box-shadow: 0 8px 26px rgb(var(--shadow) / .22);
}

html.dark .site-header {
  background: rgb(var(--bg-elevated) / .68);
  box-shadow: 0 5px 18px rgb(var(--shadow) / .22);
}

html.dark .site-header.is-scrolled {
  background: rgb(var(--bg-elevated) / .78);
  box-shadow: 0 8px 26px rgb(var(--shadow) / .34);
}