#header {
  display: block;
  position: sticky;
  top: 0;
  z-index: 50;
}

html {
  scroll-padding-top: 5.5rem;
}

main section[id],
section[id] {
  scroll-margin-top: 5.5rem;
}

.site-header-shell {
  width: 100%;
  position: relative;
  background: #fff;
}

.site-header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  min-height: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
}

.site-logo {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-width: 0;
}

.site-logo img {
  width: auto;
  height: 50px;
  display: block;
}

.site-nav {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  white-space: nowrap;
}

.site-auth {
  flex: 0 0 10.5rem;
  min-width: 10.5rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.25rem;
  padding-left: 0.7rem;
  border-left: 1px solid #e5e7eb;
  white-space: nowrap;
}

.site-header-shell .nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.25rem;
  padding: 0.45rem 0.48rem;
  border-radius: 0.5rem;
  color: #4b5563;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  transition: color .18s ease, background-color .18s ease;
  white-space: nowrap;
}

.site-header-shell .nav-link:hover,
.site-header-shell .nav-link.active {
  color: #2563eb;
  background: #eff6ff;
}

.site-header-shell .nav-link.active {
  font-weight: 800;
}

.site-auth-link {
  border: 1px solid #e5e7eb;
  background: #fff;
}

.site-menu-button {
  margin-left: auto;
  color: #111827;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.75rem;
  border: 1px solid #e5e7eb;
  background: #fff;
}

.site-menu-button:hover {
  background: #f8fafc;
}

.site-menu-icon {
  display: block;
  font-size: 1.7rem;
  line-height: 1;
  font-weight: 800;
}

.site-mobile-link {
  display: block;
  padding: 0.8rem 1.5rem;
  color: #374151;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid #f3f4f6;
}

.site-mobile-link:hover,
.site-mobile-link.active {
  background: #eff6ff;
  color: #2563eb;
}

.site-mobile-link.active {
  font-weight: 800;
}

.site-header-shell .hidden,
#mobile-menu.hidden {
  display: none !important;
}

#mobile-menu:not(.hidden) {
  display: block !important;
}

@media (min-width: 1280px) {
  .site-header-shell .nav-link {
    padding-left: 0.62rem;
    padding-right: 0.62rem;
    font-size: 0.95rem;
  }

  .site-nav {
    gap: 0.35rem;
  }
}

@media (min-width: 1024px) {
  .site-menu-button {
    display: none;
  }
}

@media (max-width: 1023px) {
  .site-header-inner {
    padding: 0.6rem 0.85rem;
    min-height: 4rem;
  }

  .site-nav,
  .site-auth {
    display: none;
  }

  .site-logo img {
    height: 42px;
    max-width: calc(100vw - 5rem);
    object-fit: contain;
  }
}