/* Open header at scroll 0; one glass surface forms as its contents gather. */
.site-header {
  --nav-width: calc(100% - 64px);
  --nav-top: 22px;
  --nav-pad-x: 0px;
  --nav-pad-y: 0px;
  --nav-surface: 0;
  --nav-logo-size: 26px;
  --nav-mark-size: 29px;
  --nav-action-font: 12px;
  --nav-action-pad-x: 16px;
  --nav-action-pad-y: 11px;
  --nav-gap: 26px;
  position: fixed;
  inset: 0 0 auto;
  display: flex;
  justify-content: center;
  padding: calc(env(safe-area-inset-top, 0px) + var(--nav-top)) 0 0;
  background: transparent;
}
.nav-shell {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: none;
  width: var(--nav-width);
  min-width: 0;
  padding: var(--nav-pad-y) var(--nav-pad-x);
}
.nav-surface {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  border-radius: 999px;
  opacity: var(--nav-surface);
  background: linear-gradient(135deg, #ffffffad, #ffffff66);
  box-shadow: inset 0 1px 0 #fffffff2, inset 0 0 0 1px #ffffff94, 0 10px 30px -14px #42354e40;
  backdrop-filter: blur(22px) saturate(155%);
  -webkit-backdrop-filter: blur(22px) saturate(155%);
}
.nav-shell > .collect-mark {
  position: relative;
  flex: none;
  font-size: var(--nav-logo-size);
  white-space: nowrap;
}
.nav-shell > .collect-mark > span {
  width: var(--nav-mark-size);
  height: var(--nav-mark-size);
}
.site-header .nav-shell nav {
  flex: none;
  gap: var(--nav-gap);
  white-space: nowrap;
}
.nav-shell .action-small {
  font-size: var(--nav-action-font);
  padding: var(--nav-action-pad-y) var(--nav-action-pad-x);
}
@media (max-width: 600px) {
  .site-header {
    --nav-width: calc(100% - 46px);
    --nav-top: 21px;
    --nav-logo-size: 23px;
    --nav-mark-size: 25px;
    --nav-action-font: 10px;
    --nav-action-pad-x: 13px;
    --nav-action-pad-y: 10px;
    --nav-gap: 18px;
  }
  .nav-shell .collect-mark { gap: 8px; }
  .nav-shell .signin { display: inline; font-size: 10px; }
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .nav-surface { background: #f7f6f4f2; }
}