.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-matte-black);
  border-bottom: 1px solid var(--color-border-dark);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 4.5rem;
  padding-block: var(--space-xs);
}

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

.site-header__brand:hover {
  color: var(--color-warm-cream);
  text-decoration: none;
}

.site-header__logo {
  width: 2.75rem;
  height: 2.75rem;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  position: relative;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.375rem;
  background: transparent;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

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

.site-header__toggle:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.site-header__toggle-line {
  display: block;
  width: 1.25rem;
  height: 2px;
  background-color: var(--color-warm-cream);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(0.5rem) 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(-0.5rem) rotate(-45deg);
}

.site-header__nav {
  display: flex;
  align-items: center;
  flex-shrink: 1;
  min-width: 0;
}

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

.site-header__nav-item {
  margin: 0;
  padding: 0;
  flex-shrink: 0;
}

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-xs) 0;
  font-size: var(--text-caption-size);
  font-weight: var(--text-caption-weight);
  letter-spacing: var(--text-caption-tracking);
  text-transform: uppercase;
  color: var(--color-warm-cream);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.site-header__nav-link:hover {
  color: var(--color-warm-cream);
  border-bottom-color: var(--color-brass);
}

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

.site-header__nav-link:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

@media (max-width: 63.9375rem) {
  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-matte-black);
    border-bottom: 1px solid var(--color-border-dark);
    max-height: calc(100vh - 4.5rem);
    overflow-y: auto;
    padding: var(--space-md) var(--container-padding-mobile) var(--space-lg);
    display: none;
    z-index: 999;
  }

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

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-header__nav-item {
    border-bottom: 1px solid var(--color-divider-dark);
  }

  .site-header__nav-item:last-child {
    border-bottom: none;
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-sm) 0;
    font-size: var(--text-body-size);
    letter-spacing: 0.02em;
    text-transform: none;
    border-bottom: none;
  }

  .site-header__nav-link[aria-current="page"] {
    border-bottom: none;
    color: var(--color-emerald-green);
  }
}

@media (max-width: 47.9375rem) {
  .site-header__inner {
    min-height: 4rem;
    padding-block: var(--space-2xs);
  }

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

  .site-header__brand-text {
    font-size: 1rem;
    letter-spacing: 0.06em;
  }

  .site-header__toggle {
    width: 2.5rem;
    height: 2.5rem;
  }

  .site-header__nav {
    max-height: calc(100vh - 4rem);
  }
}