.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  backdrop-filter: blur(16px);
  background: rgba(248, 245, 242, 0.92);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.site-brand {
  display: inline-flex;
  flex-direction: column;
  gap: 0.1rem;
}

.site-brand__title {
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-brand__tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  font-size: var(--font-size-sm);
}

.site-nav__item--accent .site-nav__link {
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
}

.site-nav__item--accent .site-nav__link:hover {
  background-color: var(--color-primary);
  color: #fff;
}

.site-nav__link {
  position: relative;
  padding-bottom: 0.1rem;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-text);
  transition: width var(--transition-base);
}

.site-nav__link:hover::after,
.site-nav__link--active::after,
.site-nav__link[aria-current="page"]::after {
  width: 100%;
}

.site-header__toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid var(--color-gray-200);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.25rem;
  background-color: var(--color-surface);
  cursor: pointer;
}

.site-header__toggle-bar {
  width: 1.2rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-text);
  transform-origin: center;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle.is-open .site-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header__toggle.is-open .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle.is-open .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 768px) {
  .site-header {
    position: relative;
  }

  .site-header__inner {
    height: auto;
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-nav-wrapper {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: rgba(248, 245, 242, 0.98);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    display: none;
    z-index: var(--z-overlay);
  }

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

  .site-nav {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4) var(--container-padding-x) var(--space-5);
  }

  .site-nav__item--accent .site-nav__link {
    padding-left: 0;
    padding-right: 0;
    background: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav-wrapper,
  .site-header__toggle-bar {
    transition: none;
  }
}