.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-abyss);
  border-bottom: var(--border-mist-15);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  width: 100%;
  max-width: var(--container-primary);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  min-height: 64px;
}

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

.site-header__logo {
  width: 28px;
  height: 28px;
  object-fit: contain;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: var(--weight-semibold);
  letter-spacing: 0.02em;
  color: var(--color-foam);
  white-space: nowrap;
}

.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
}

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-foam);
  transition: transform var(--transition-transform), opacity var(--transition-opacity);
  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-hull);
  border-bottom: var(--border-mist-15);
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  z-index: 999;
}

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

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

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

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

.site-header__nav-link {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-mist);
  text-decoration: none;
  font-size: var(--text-body);
  font-weight: var(--weight-medium);
  line-height: var(--leading-body);
  min-height: 48px;
  display: flex;
  align-items: center;
  transition: color var(--transition-color), background-color var(--transition-color);
  border-radius: var(--radius-sm);
}

.site-header__nav-link:hover {
  color: var(--color-foam);
  background-color: var(--color-deck);
}

.site-header__nav-link[aria-current="page"] {
  color: var(--color-signal);
}

@media (min-width: 768px) {
  .site-header__inner {
    min-height: 72px;
    padding-inline: var(--container-padding-desktop);
  }

  .site-header__logo {
    width: 36px;
    height: 36px;
  }

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

  .site-header__toggle {
    display: none;
  }

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

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

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

  .site-header__nav-link {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2xs) var(--space-xs);
    min-height: 44px;
    font-size: var(--text-body-sm);
    line-height: var(--leading-body-sm);
    white-space: nowrap;
  }
}

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