.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-block-end: var(--border-subtle);
  background: rgba(26, 24, 23, 0.97);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.site-header__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  min-height: 4.5rem;
  gap: var(--space-3);
}

.site-header__brand,
.site-header__action,
.site-header__toggle {
  position: relative;
  z-index: 102;
}

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

.site-header__logo {
  flex: 0 0 1.875rem;
  width: 1.875rem;
  height: 1.875rem;
  object-fit: contain;
}

.site-header__brand-text {
  overflow: hidden;
  color: var(--color-ivory);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-header__toggle {
  display: inline-flex;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  gap: 0.25rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-control);
  color: var(--color-ivory);
}

.site-header__toggle:hover {
  border-color: var(--color-brass);
  color: var(--color-brass);
}

.site-header__toggle-line {
  display: block;
  width: 1.125rem;
  height: 1px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(5px) 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(-5px) rotate(-45deg);
}

.site-header__action {
  min-width: auto;
  padding-inline: var(--space-3);
  white-space: nowrap;
}

.site-header__nav {
  position: fixed;
  z-index: 101;
  top: 4.5rem;
  right: 0;
  bottom: 0;
  left: auto;
  display: none;
  width: min(100%, 24rem);
  overflow-y: auto;
  border-inline-start: var(--border-subtle);
  background: var(--color-charcoal);
  box-shadow: var(--shadow-atmospheric);
}

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

.site-header__nav-list,
.site-header__nav-list li,
.site-header__nav-list li + li {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list {
  display: grid;
  gap: 0;
  padding: var(--space-3) var(--space-4);
}

.site-header__nav a {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  padding: var(--space-2) 0;
  border-block-end: 1px solid color-mix(in srgb, var(--color-line) 72%, transparent);
  color: var(--color-ivory);
  font-size: var(--text-utility);
  font-weight: 600;
  line-height: var(--leading-utility);
  text-decoration: none;
}

.site-header__nav a:hover,
.site-header__nav a[aria-current="page"] {
  color: var(--color-brass);
}

.site-header__nav a[aria-current="page"] {
  font-weight: 700;
}

@media (max-width: 25rem) {
  .site-header__brand-text {
    font-size: 0.9375rem;
  }

  .site-header__action {
    display: none;
  }
}

@media (min-width: 56.25rem) {
  .site-header__inner {
    grid-template-columns: auto minmax(0, 1fr) auto;
    min-height: 4.75rem;
    gap: var(--space-4);
  }

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

  .site-header__brand-text {
    font-size: 1.0625rem;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    position: static;
    display: block;
    width: auto;
    overflow: visible;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .site-header__nav-list {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: clamp(0.625rem, 1.35vw, 1.25rem);
    padding: 0;
  }

  .site-header__nav-list li {
    display: flex;
    align-items: center;
  }

  .site-header__nav a {
    min-height: 2.75rem;
    padding: 0;
    border: 0;
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .site-header__nav a[aria-current="page"]::after {
    position: absolute;
    bottom: 0.2rem;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--color-brass);
    content: "";
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__toggle-line {
    transition: none;
  }
}