.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-harbour-navy);
  color: var(--color-warm-ivory);
  border-bottom: 1px solid var(--color-ivory-15);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  min-height: 4.5rem;
}

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

.site-header__logo {
  display: block;
  width: 2.25rem;
  height: 2.25rem;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.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;
  background: transparent;
  border: 1px solid var(--color-ivory-15);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  border-color: var(--color-muted-copper);
}

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

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

.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 {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-harbour-navy);
  border-bottom: 1px solid var(--color-ivory-15);
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-fast);
  z-index: 999;
}

.site-header__nav.is-open {
  max-height: calc(100vh - 4.5rem);
  overflow-y: auto;
}

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

.site-header__nav-item {
  margin: 0;
}

.site-header__nav-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-warm-ivory);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
  border-radius: var(--radius-button);
}

.site-header__nav-link:hover {
  color: var(--color-muted-copper);
  background-color: var(--color-ivory-15);
}

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

@media (min-width: 64rem) {
  .site-header__inner {
    min-height: 5rem;
    padding-inline: var(--container-padding-desktop);
  }

  .site-header__logo {
    width: 2.5rem;
    height: 2.5rem;
  }

  .site-header__brand-text {
    font-size: 0.875rem;
  }

  .site-header__toggle {
    display: none;
  }

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

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

  .site-header__nav-link {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.8125rem;
    letter-spacing: 0.06em;
  }
}