.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--ink);
  border-bottom: 1px solid var(--hairline);
  height: 72px;
  display: flex;
  align-items: center;
}

.site-header__inner {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad-mobile);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  height: 100%;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  text-decoration: none;
  color: var(--porcelain);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__wordmark {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3xs);
  min-height: 48px;
  min-width: 48px;
  padding: var(--space-xs);
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--porcelain);
  transition: background-color var(--transition-fast), transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle:hover span {
  background-color: var(--brass);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-header__nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: var(--ink);
  border-bottom: 1px solid var(--hairline);
  max-height: calc(100vh - 72px);
  overflow-y: auto;
  z-index: 999;
}

.site-header__nav.is-open {
  display: block;
}

.site-header__nav-list {
  list-style: none !important;
  margin: 0;
  padding: var(--space-sm) var(--container-pad-mobile) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.site-header__nav-list li {
  margin: 0;
  padding: 0;
}

.site-header__nav-list li + li {
  margin: 0;
}

.site-header__nav-list a {
  display: block;
  padding: var(--space-xs) 0;
  font-size: 0.8125rem;
  line-height: 1.2;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--porcelain-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-header__nav-list a:hover,
.site-header__nav-list a:focus-visible {
  color: var(--porcelain);
}

.site-header__nav-list a[aria-current="page"] {
  color: var(--porcelain);
  border-bottom: 2px solid var(--brass);
}

@media (min-width: 768px) {
  .site-header__inner {
    padding-inline: var(--container-pad-desktop);
  }

  .site-header__logo {
    width: 40px;
    height: 40px;
  }

  .site-header__wordmark {
    font-size: 1.5rem;
  }

  .nav-toggle {
    display: none;
  }

  .site-header__nav {
    display: block;
    position: static;
    width: auto;
    background: transparent;
    border: none;
    max-height: none;
    overflow: visible;
    z-index: auto;
  }

  .site-header__nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-lg);
    padding: 0;
    margin: 0;
  }

  .site-header__nav-list a {
    padding: var(--space-2xs) 0;
    border-bottom: 2px solid transparent;
  }

  .site-header__nav-list a[aria-current="page"] {
    border-bottom-color: var(--brass);
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    gap: var(--space-xl);
  }
}