.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-graphite-900);
  border-bottom: 1px solid var(--color-graphite-500);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.site-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    transparent 50%,
    rgba(245, 245, 240, 0.03) 50%,
    rgba(245, 245, 240, 0.03) 51%,
    transparent 51%,
    transparent 100%
  );
  background-size: 100% 4px;
  pointer-events: none;
  z-index: 1;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 72px;
  padding-block: var(--space-3);
  position: relative;
  z-index: 2;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-off-white-100);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__brand:hover {
  color: var(--color-off-white-100);
}

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-graphite-500);
  border-radius: var(--radius-small);
  cursor: pointer;
  transition: background-color var(--transition-color), border-color var(--transition-color);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  background-color: var(--color-graphite-700);
  border-color: var(--color-blue-600);
}

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

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-off-white-100);
  transition: transform var(--transition-transform), opacity var(--transition-color);
  transform-origin: center;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

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

.site-header__nav-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-off-white-100);
  text-decoration: none;
  padding: var(--space-2) var(--space-1);
  position: relative;
  transition: color var(--transition-color);
  white-space: nowrap;
}

.site-header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-red-600);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-transform);
}

.site-header__nav-link:hover {
  color: var(--color-off-white-100);
}

.site-header__nav-link:hover::after {
  transform: scaleX(1);
}

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

.site-header__nav-item--cta .site-header__nav-link--cta {
  background-color: var(--color-red-600);
  color: var(--color-off-white-100);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-none);
  border: 1px solid var(--color-red-600);
  transition: background-color var(--transition-color), border-color var(--transition-color), transform var(--transition-transform);
}

.site-header__nav-item--cta .site-header__nav-link--cta::after {
  display: none;
}

.site-header__nav-item--cta .site-header__nav-link--cta:hover {
  background-color: #B71C1C;
  border-color: #B71C1C;
  transform: translateY(-1px);
}

@media (max-width: 1023px) {
  .site-header__inner {
    min-height: 64px;
  }

  .site-header__logo {
    width: 36px;
    height: 36px;
  }

  .site-header__brand-text {
    font-size: 20px;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-graphite-900);
    border-bottom: 1px solid var(--color-graphite-500);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-transform);
    z-index: 1001;
  }

  .site-header__nav.is-open {
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }

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

  .site-header__nav-item {
    width: 100%;
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-3) var(--space-2);
    font-size: 18px;
    border-bottom: 1px solid var(--color-graphite-500);
  }

  .site-header__nav-link::after {
    display: none;
  }

  .site-header__nav-item--cta .site-header__nav-link--cta {
    display: block;
    text-align: center;
    margin-top: var(--space-3);
    border-bottom: none;
  }
}

@media (min-width: 1024px) {
  .site-header__nav {
    position: static;
    max-height: none;
    overflow: visible;
    background: transparent;
    border: none;
    box-shadow: none;
  }

  .site-header__nav-list {
    flex-direction: row;
    gap: var(--space-4);
    padding: 0;
  }

  .site-header__nav-item {
    width: auto;
  }

  .site-header__nav-link {
    display: inline-flex;
    padding: var(--space-2) var(--space-1);
    font-size: 16px;
    border-bottom: none;
  }

  .site-header__nav-link::after {
    display: block;
  }

  .site-header__nav-item--cta .site-header__nav-link--cta {
    display: inline-flex;
    padding: var(--space-2) var(--space-4);
    margin-top: 0;
    border-bottom: none;
  }
}