.site-header {
  background-color: var(--color-ink);
  border-bottom: 1px solid rgba(138, 173, 168, 0.12);
  position: relative;
  z-index: 1000;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  min-height: 56px;
  padding-block: var(--space-2xs);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  text-decoration: none;
  color: var(--color-ivory);
  min-width: 0;
  flex-shrink: 0;
}

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

.site-header__logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.2;
  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: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.site-header__toggle:hover {
  background-color: rgba(138, 173, 168, 0.10);
}

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

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-ivory);
  border-radius: 1px;
  transition: transform var(--transition-transform), opacity var(--transition-fast);
  transform-origin: center;
}

.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(--color-ink);
  border-bottom: 1px solid rgba(138, 173, 168, 0.12);
  padding: var(--space-sm) var(--container-gutter-mobile) var(--space-md);
  max-height: calc(100vh - 100%);
  overflow-y: auto;
  z-index: 999;
}

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

.site-header__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

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

.site-header__nav-link {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-ivory);
  text-decoration: none;
  font-size: var(--text-body-size);
  font-weight: 500;
  line-height: 1.4;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__nav-link:hover {
  background-color: rgba(138, 173, 168, 0.10);
  color: var(--color-ivory);
}

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

@media (min-width: 768px) {
  .site-header__inner {
    min-height: 64px;
    padding-block: var(--space-xs);
  }

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

  .site-header__brand-text {
    font-size: 1.125rem;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    display: block;
    position: static;
    background: none;
    border: none;
    padding: 0;
    max-height: none;
    overflow: visible;
    z-index: auto;
  }

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

  .site-header__nav-link {
    padding: var(--space-2xs) var(--space-xs);
    font-size: var(--text-button-size);
    white-space: nowrap;
  }
}

@media (min-width: 1024px) {
  .site-header__nav-list {
    gap: var(--space-md);
  }
}