.site-header {
  position: relative;
  z-index: 100;
  background: var(--color-graphite);
  color: var(--color-limestone);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  min-height: 5.625rem;
  gap: var(--space-4);
}

.site-header__brand {
  display: flex;
  flex: 0 1 auto;
  align-items: center;
  min-width: 0;
  gap: 0.6875rem;
  color: var(--color-limestone);
  text-decoration: none;
}

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

.site-header__mark {
  flex: 0 0 auto;
  width: 2.625rem;
  height: 2.625rem;
  object-fit: contain;
}

.site-header__brand-copy {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 0.125rem;
  line-height: 1;
}

.site-header__brand-name {
  white-space: nowrap;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.09em;
}

.site-header__brand-tagline {
  overflow: hidden;
  color: var(--color-limestone-muted);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.075em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-header__nav {
  min-width: 0;
  margin-inline: auto;
}

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.625rem, 1.2vw, 1.125rem);
}

.site-header__nav-list li + li { margin: 0; }

.site-header__nav-list a,
.site-header__discover {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  color: var(--color-limestone);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  line-height: 1.2;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-header__nav-list a:hover,
.site-header__discover:hover { color: var(--color-copper); }

.site-header__actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: var(--space-3);
}

.site-header__actions .button {
  min-height: 2.5rem;
  padding: 0.5625rem 0.75rem;
  font-size: 0.625rem;
  white-space: nowrap;
}

.site-header__discover { font-size: 0.625rem; }

.site-header__toggle,
.site-header__mobile-actions {
  display: none;
}

.site-header__route {
  padding-block: 0.5625rem 0.6875rem;
  border-top: 1px solid var(--color-border);
}

.site-header__route .route-line__stop {
  font-size: 0.625rem;
  letter-spacing: 0.035em;
}

.site-header__nav-item--mobile { display: none; }

@media (max-width: 1120px) {
  .site-header__inner { min-height: 5rem; }
  .site-header__brand-tagline { display: none; }
  .site-header__nav-list { gap: 0.75rem; }
  .site-header__nav-list a { font-size: 0.625rem; }
  .site-header__actions .button { display: none; }
}

@media (max-width: 960px) {
  .site-header__inner {
    justify-content: space-between;
    min-height: 4.625rem;
  }

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

  .site-header__brand-name { font-size: 0.75rem; }

  .site-header__actions { display: none; }

  .site-header__toggle {
    display: inline-flex;
    position: relative;
    z-index: 2;
    flex: 0 0 auto;
    flex-direction: column;
    justify-content: center;
    width: 2.875rem;
    height: 2.875rem;
    padding: 0.625rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-limestone);
    gap: 0.25rem;
  }

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

  .site-header__toggle-line {
    display: block;
    width: 100%;
    height: 1px;
    background: currentColor;
    transform-origin: center;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) { transform: translateY(0.3125rem) 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(-0.3125rem) rotate(-45deg); }

  .site-header__nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    max-height: calc(100vh - 4.625rem);
    overflow-y: auto;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-navy);
    box-shadow: var(--shadow-float);
  }

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

  .site-header__nav-list {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3) var(--container-padding) var(--space-4);
  }

  .site-header__nav-list a {
    width: 100%;
    min-height: 3rem;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--text-sm);
  }

  .site-header__nav-item--mobile { display: list-item; }

  .site-header__mobile-actions {
    display: grid;
    gap: var(--space-3);
    padding: 0 var(--container-padding) var(--space-5);
  }

  .site-header__mobile-actions .button { width: 100%; }
  .site-header__mobile-actions .site-header__discover { justify-content: center; }

  .site-header__route { display: none; }
}

@media (max-width: 420px) {
  .site-header__inner { gap: var(--space-2); }
  .site-header__brand { gap: var(--space-2); }
  .site-header__brand-name { font-size: 0.6875rem; letter-spacing: 0.06em; }
}

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