/* Homepage header only. Page content and interior UI retain their existing styles. */
body.homepage .masthead {
  --ui-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  --ui-soft: rgba(232, 241, 255, .065);
}
html[data-theme="light"] body.homepage .masthead { --ui-soft: rgba(20, 30, 40, .045); }
body.homepage .masthead :is(.brand, .header-left, .header-tools) { opacity: 1; transform: none; animation: none; }
body.homepage .masthead { --topbar-inset: max(20px, var(--safe-left), var(--safe-right)); top: calc(var(--safe-top) + 14px); }
body.homepage .masthead.is-scrolled,
html[data-theme="light"] body.homepage .masthead.is-scrolled { background: transparent; border: 0; backdrop-filter: none; }
body.homepage .masthead-inner {
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  width: calc(100% - 2 * var(--topbar-inset));
  max-width: none;
  height: 62px;
  margin-inline: var(--topbar-inset);
  padding-inline: 18px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
body.homepage .masthead-inner::before {
  content: "";
  position: absolute;
  inset: -1px;
  z-index: -1;
  border: 1px solid rgba(232, 241, 255, .035);
  border-radius: inherit;
  background: rgba(14, 20, 28, .05);
  box-shadow: 0 4px 16px rgba(0, 0, 0, .02);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-2px) scale(.99);
  transform-origin: center top;
  transition: opacity 260ms ease, transform 260ms cubic-bezier(.2, .8, .2, 1), visibility 0s 260ms;
  pointer-events: none;
}
body.homepage .masthead.is-scrolled .masthead-inner::before {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s;
}
html[data-theme="light"] body.homepage .masthead-inner::before {
  background: rgba(244, 248, 252, .05);
  border-color: rgba(20, 30, 40, .03);
  box-shadow: 0 4px 16px rgba(20, 30, 40, .015);
}
body.homepage .masthead.is-scrolled :is(.brand img, .menu-btn svg) { filter: drop-shadow(0 1px 2px rgba(0, 0, 0, .35)); }
body.homepage .masthead.is-scrolled .header-tools { text-shadow: 0 1px 3px rgba(0, 0, 0, .35); }
html[data-theme="light"] body.homepage .masthead.is-scrolled :is(.brand img, .menu-btn svg) { filter: none; }
html[data-theme="light"] body.homepage .masthead.is-scrolled .header-tools { text-shadow: none; }
html[data-theme="light"] body.homepage .brand .logo-on-dark { display: none; }
html[data-theme="light"] body.homepage .brand .logo-on-light { display: block; }
body.homepage .brand { justify-self: center; display: flex; align-items: center; min-height: 44px; }
body.homepage .brand img { height: 27px; aspect-ratio: 9 / 2; }
body.homepage .header-left { margin-left: 0; }
body.homepage .header-tools { gap: 20px; font-family: var(--ui-font); }
body.homepage .header-tools .nav-links { min-height: 44px; }
body.homepage .header-tools .nav-links > :is(a, button) { display: inline-flex; align-items: center; min-height: 44px; }
html[data-theme="light"] body.homepage .header-tools .nav-links > :is(a, button),
html[data-theme="light"] body.homepage .menu-btn { color: var(--text); }
body.homepage .menu-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-width: 44px; min-height: 44px; padding: 0 10px; border-radius: 10px;
  letter-spacing: 0; text-transform: none; font-size: 13px; transition: background 180ms;
}
body.homepage .menu-btn svg { width: 20px; height: 20px; }
body.homepage .menu-btn:hover { background: var(--ui-soft); }
@media (max-width: 950px) {
  body.homepage .header-tools { gap: 12px; }
  body.homepage .nav-account > span:not(.nav-avatar) { max-width: 100px; }
}
@media (max-width: 719px) {
  body.homepage .masthead { --topbar-inset: max(12px, var(--safe-left), var(--safe-right)); top: calc(var(--safe-top) + 10px); }
  body.homepage .masthead-inner { padding-inline: 12px; height: 60px; border-radius: 16px; }
  body.homepage .brand img { height: 24px; }
  body.homepage .header-tools { gap: 6px; }
  body.homepage .home-menu-label { display: none; }
  body.homepage .menu-btn { padding: 0; }
  body.homepage .nav-account > span:not(.nav-avatar) { display: none; }
}
@media (prefers-reduced-transparency: reduce) {
  body.homepage .masthead-inner::before { background-color: #0e141c; backdrop-filter: none; -webkit-backdrop-filter: none; }
  html[data-theme="light"] body.homepage .masthead-inner::before { background-color: #f4f8fc; }
}
@media (prefers-reduced-motion: reduce) {
  body.homepage .masthead .menu-btn { transition: none; }
  body.homepage .masthead-inner::before { transition: none; transform: none; }
}