/* Only the official site shell: product typography and layout stay independent. */
html { scroll-padding-top: 92px; }
.skip-link { z-index: 120; }
.official-header {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: 70px;
  padding: 14px 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 28px;
  background: #ffffffd9;
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid #00000014;
}
.official-brand { display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; white-space: nowrap; }
.official-brand img { border-radius: 8px; }
.official-brand small { color: #a1a1a6; font-size: .85em; font-weight: 400; }
.official-menu { display: flex; align-items: center; gap: clamp(18px, 2.2vw, 34px); font-size: 15px; font-weight: 500; color: #86868b; }
.official-menu a { padding: 8px 0; white-space: nowrap; }
.official-menu a:hover, .official-menu a[aria-current="page"] { color: #1d1d1f; }
.official-toggle { display: none; }
.footer .official-footer-links { justify-content: flex-start; flex-wrap: wrap; gap: 24px; margin-top: 22px; font-size: 12px; }
.official-footer-links a:hover { color: var(--ink); }
@media (max-width: 960px) {
  .official-header { min-height: 64px; padding: 10px 24px; }
  .official-brand { font-size: 16px; }
  .official-toggle { display: flex; position: relative; z-index: 2; flex-direction: column; justify-content: center; align-items: center; gap: 6px; width: 44px; height: 44px; padding: 0; border: 0; background: transparent; }
  .official-toggle span { width: 18px; height: 2px; border-radius: 2px; background: #1d1d1f; transition: transform .3s var(--ease); }
  .official-menu { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #f5f5f7; padding: 20px 28px 32px; max-height: calc(100dvh - 64px); overflow-y: auto; flex-direction: column; align-items: stretch; gap: 0; box-shadow: 0 18px 25px #0000000b; }
  .official-menu a { padding: 16px 0; font-size: 22px; font-weight: 600; border-bottom: 1px solid #0000000a; }
  .official-menu a:last-child { border-bottom: 0; }
  .official-header.is-open .official-menu { display: flex; animation: official-menu-enter .32s var(--ease) both; }
  .official-header.is-open .official-toggle span:first-child { transform: translateY(4px) rotate(45deg); }
  .official-header.is-open .official-toggle span:last-child { transform: translateY(-4px) rotate(-45deg); }
}
@keyframes official-menu-enter { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) { .official-header * { animation: none !important; transition: none !important; } }