.site-header {
  position: relative;
  z-index: 100;
  background-color: var(--surface-page);
  border-bottom: var(--border-primary);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 4.5rem;
  padding-block: var(--space-sm);
}

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

.site-header__logo {
  width: 2.5rem;
  height: 2.5rem;
  object-fit: contain;
  display: block;
}

.site-header__wordmark {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-ink-navy);
}

.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: var(--border-primary);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  cursor: pointer;
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  background-color: var(--surface-soft-turquoise);
}

.site-header__toggle:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.site-header__toggle-line {
  display: block;
  width: 1.25rem;
  height: 2px;
  background-color: var(--color-ink-navy);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

.site-header__nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--surface-page);
  border-bottom: var(--border-primary);
  padding: var(--space-md) var(--container-padding);
  max-height: calc(100vh - 4.5rem);
  overflow-y: auto;
  z-index: 99;
}

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

.site-header__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.site-header__item {
  margin: 0;
}

.site-header__link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-ink-navy);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__link:hover {
  background-color: var(--surface-soft-turquoise);
  color: var(--color-ink-navy);
}

.site-header__link:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

@media (min-width: 64rem) {
  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    display: block;
    position: static;
    background-color: transparent;
    border-bottom: none;
    padding: 0;
    max-height: none;
    overflow: visible;
  }

  .site-header__list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-lg);
  }

  .site-header__link {
    padding: var(--space-xs) var(--space-sm);
    font-size: 1rem;
  }
}

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