.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: var(--border-subtle);
  background: rgba(16, 13, 24, 0.97);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.2);
}

.site-header__inner {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  flex: 0 1 auto;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-ink-primary);
  text-decoration: none;
}

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

.site-header__logo {
  width: 2.5rem;
  height: 2.5rem;
  flex: 0 0 2.5rem;
  object-fit: contain;
}

.site-header__brand-copy {
  display: grid;
  min-width: 0;
  gap: 0.1rem;
}

.site-header__brand-name {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.15;
  white-space: nowrap;
}

.site-header__brand-tagline {
  color: var(--color-ink-muted);
  font-size: var(--text-micro);
  line-height: 1.25;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  width: 2.75rem;
  min-width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  margin-left: auto;
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--color-bg-panel);
}

.nav-toggle__line {
  display: block;
  width: 1.125rem;
  height: 2px;
  background: var(--color-ink-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(0.375rem) 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(-0.375rem) rotate(-45deg);
}

.site-navigation {
  display: flex;
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

.site-navigation__list {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.875rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-navigation__list li,
.site-navigation__list li + li {
  display: flex;
  min-width: 0;
  margin: 0;
  padding: 0;
}

.site-navigation__link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  border-bottom: 2px solid transparent;
  color: var(--color-ink-primary);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
}

.site-navigation__link:hover,
.site-navigation__link[aria-current="page"] {
  border-bottom-color: var(--color-ember);
  color: var(--color-ember-strong);
}

.site-navigation__cta {
  flex: 0 0 auto;
  max-width: 16.5rem;
  min-height: 2.75rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.6875rem;
}

.site-navigation__mobile-only {
  display: none !important;
}

@media (max-width: 72rem) {
  .site-header__inner {
    min-height: 4rem;
  }

  .site-header__logo {
    width: 2.25rem;
    height: 2.25rem;
    flex-basis: 2.25rem;
  }

  .site-header__brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-navigation {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    border-bottom: var(--border-subtle);
    background: var(--color-bg-panel-raised);
    box-shadow: var(--shadow-floating);
    padding: var(--space-3) max(var(--container-padding), 1rem) var(--space-4);
  }

  .site-navigation.is-open {
    display: grid;
    gap: var(--space-3);
  }

  .site-navigation__list {
    display: grid;
    gap: 0;
  }

  .site-navigation__list li,
  .site-navigation__mobile-only {
    display: block !important;
  }

  .site-navigation__link {
    width: 100%;
    min-height: 2.75rem;
    justify-content: flex-start;
    border-bottom: 1px solid var(--color-line-subtle);
    font-size: var(--text-label);
    text-align: left;
  }

  .site-navigation__link[aria-current="page"],
  .site-navigation__link:hover {
    border-bottom-color: var(--color-ember);
  }

  .site-navigation__cta {
    width: 100%;
    max-width: none;
    min-height: 2.75rem;
  }
}

@media (max-width: 37.5rem) {
  .site-header__inner {
    min-height: 3.75rem;
    gap: var(--space-2);
  }

  .site-header__logo {
    width: 2.125rem;
    height: 2.125rem;
    flex-basis: 2.125rem;
  }

  .site-header__brand {
    gap: var(--space-2);
  }

  .site-header__brand-name {
    font-size: 1rem;
  }

  .site-navigation {
    max-height: calc(100vh - 3.75rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-toggle__line {
    transition: none;
  }
}

ul { list-style: none !important; }
.nav-toggle { flex-direction: column; }