.site-header {
  position: relative;
  z-index: 100;
  width: 100%;
  border-bottom: 1px solid var(--color-line-200);
  background: var(--color-ivory-50);
  color: var(--color-navy-900);
}

.site-header__inner {
  display: flex;
  min-height: 4.75rem;
  align-items: center;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  flex: 0 1 auto;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-navy-900);
  text-decoration: none;
}

.site-header__brand:hover { color: var(--color-burgundy-700); }

.site-header__mark {
  width: 2rem;
  height: 2rem;
  flex: 0 0 2rem;
  object-fit: contain;
}

.site-header__wordmark {
  white-space: nowrap;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

.site-header__toggle,
.site-header__close {
  border: 0;
  background: transparent;
  color: var(--color-navy-900);
}

.site-header__toggle {
  display: inline-grid;
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 auto;
  place-content: center;
  gap: 0.25rem;
  margin-left: auto;
  border: 1px solid var(--color-line-200);
  border-radius: var(--radius-sm);
}

.site-header__toggle-line {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) { transform: translateY(0.375rem) rotate(45deg); }
.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) { opacity: 0; }
.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) { transform: translateY(-0.375rem) rotate(-45deg); }

.site-header__nav {
  position: absolute;
  z-index: 101;
  top: calc(100% + 1px);
  right: 0;
  left: 0;
  display: none;
  max-height: calc(100vh - 4.75rem);
  overflow-y: auto;
  border-bottom: 1px solid var(--color-line-200);
  background: var(--color-ivory-50);
  box-shadow: var(--shadow-card);
}

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

.site-header__nav-head {
  display: flex;
  min-height: 4rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--container-padding);
  border-bottom: 1px solid var(--color-line-200);
  color: var(--color-navy-900);
  font-size: var(--text-sm);
  font-weight: 700;
}

.site-header__close {
  min-height: 2.75rem;
  padding: 0.5rem 0;
  color: var(--color-burgundy-700);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 0.16em;
}

.site-header__list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__list li,
.site-header__list li + li { margin: 0; padding: 0; }

.site-header__list a,
.site-header__mobile-contact {
  display: flex;
  min-height: 3.25rem;
  align-items: center;
  padding: 0.75rem var(--container-padding);
  border-bottom: 1px solid var(--color-line-200);
  color: var(--color-navy-900);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
}

.site-header__list a:hover,
.site-header__mobile-contact:hover { color: var(--color-burgundy-700); background: var(--color-stone-100); }

.site-header__mobile-contact { border-bottom: 0; color: var(--color-burgundy-700); }
.site-header__action { display: none; }

.site-header :is(a, button):focus-visible { box-shadow: var(--focus-ring-light); }

@media (min-width: 68rem) {
  .site-header__inner { min-height: 5.25rem; gap: var(--space-5); }
  .site-header__mark { width: 2.5rem; height: 2.5rem; flex-basis: 2.5rem; }
  .site-header__wordmark { font-size: 1.375rem; }
  .site-header__toggle { display: none; }
  .site-header__nav {
    position: static;
    display: block;
    min-width: 0;
    max-height: none;
    flex: 1 1 auto;
    overflow: visible;
    border: 0;
    background: transparent;
    box-shadow: none;
  }
  .site-header__nav-head,
  .site-header__mobile-contact,
  .site-header__mobile-link { display: none; }
  .site-header__list {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: clamp(0.75rem, 1.5vw, 1.5rem);
  }
  .site-header__list a {
    min-height: 2.75rem;
    padding: 0;
    border: 0;
    white-space: nowrap;
    font-size: 0.8125rem;
  }
  .site-header__action { display: inline-flex; flex: 0 0 auto; }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__toggle-line { transition: none; }
}