/* Site header */

.skip-link {
  position: absolute;
  top: var(--spacing-2);
  left: var(--spacing-2);
  z-index: 10000;
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--border-radius);
  background-color: var(--surface-elevated);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  transform: translateY(-200%);
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  --header-height: 4rem;
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition:
    background-color var(--transition-base),
    border-color var(--transition-base),
    backdrop-filter var(--transition-base);
}

.site-header[data-scrolled="true"] {
  background-color: color-mix(in srgb, var(--bg-primary) 82%, transparent);
  border-bottom-color: var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header__inner {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--spacing-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  flex-shrink: 0;
  color: var(--accent-color);
  text-decoration: none;
}

.brand__mark {
  display: block;
  width: 2.8rem;
  height: 2rem;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-5);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  padding: var(--spacing-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link[aria-current="location"] {
  color: var(--accent-color);
}

.nav-link[aria-current="location"]::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 1px;
  background-color: var(--accent-color);
}

.site-header__actions {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: var(--spacing-2);
}

.language-toggle {
  display: flex;
  gap: 0.125rem;
  padding: 0.125rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background-color: var(--bg-secondary);
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.75rem;
  min-height: 2.75rem;
  padding: 0 var(--spacing-3);
  border: none;
  border-radius: calc(var(--border-radius) - 2px);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  text-align: center;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn[aria-current="page"] {
  background-color: var(--accent-color);
  color: var(--accent-fg);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--bg-secondary);
  border-color: var(--accent-color);
}

.icon-btn__glyph {
  display: block;
  width: 1.25rem;
  height: 1.25rem;
}

.icon-btn__glyph.is-hidden {
  display: none;
}

.icon-btn [data-theme-icon="sun"] {
  display: none;
}

.icon-btn [data-theme-icon="moon"] {
  display: block;
}

html[data-theme="dark"] .icon-btn [data-theme-icon="sun"] {
  display: block;
}

html[data-theme="dark"] .icon-btn [data-theme-icon="moon"] {
  display: none;
}

.menu-toggle {
  display: none;
}

@media (max-width: 768px) {
  .nav-link[aria-current="location"]::after {
    display: none;
  }
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .site-header[data-scrolled="true"] {
    background-color: var(--bg-primary);
  }
}

@media (prefers-reduced-motion: reduce) {
  .skip-link,
  .site-header,
  .nav-link,
  .lang-btn,
  .icon-btn {
    transition: none;
  }
}