.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  background-color: var(--color-obsidian);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 72px;
  padding-block: var(--space-sm);
}

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

.brand:hover {
  color: var(--color-silver);
}

.brand__mark {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.brand__text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-silver);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.nav-toggle:hover {
  background-color: var(--color-slate);
  border-color: var(--color-slate-light);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.nav-toggle__line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__item {
  margin: 0;
  padding: 0;
}

.site-nav__item + .site-nav__item {
  margin: 0;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: var(--space-xs) 0;
  color: var(--color-silver-muted);
  font-size: var(--text-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-nav__link:hover {
  color: var(--color-crimson);
}

.site-nav__link:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.site-nav__link[aria-current="page"] {
  color: var(--color-crimson);
}

@media (max-width: 1023px) {
  .site-header__inner {
    flex-wrap: wrap;
  }

  .brand {
    flex: 1 1 auto;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex-basis: 100%;
    order: 3;
    display: none;
    width: 100%;
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding-block: var(--space-sm);
    border-top: 1px solid var(--color-border);
  }

  .site-nav__item {
    width: 100%;
  }

  .site-nav__link {
    display: flex;
    width: 100%;
    min-height: 48px;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
  }

  .site-nav__link:hover {
    background-color: var(--color-slate);
    color: var(--color-crimson);
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    min-height: 80px;
  }

  .brand__mark {
    width: 48px;
    height: 48px;
  }

  .brand__text {
    font-size: 1.25rem;
  }

  .site-nav__list {
    gap: var(--space-xl);
  }
}