.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  background-color: var(--color-milky-white);
  border-bottom: var(--border-hairline);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header.is-scrolled {
  background-color: var(--color-frosted-white);
  box-shadow: var(--shadow-hairline);
}

.site-header__inner {
  max-width: var(--container-primary);
  margin-inline: auto;
  padding-inline: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 4.5rem;
}

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

.site-header__logo {
  width: 2.5rem;
  height: 2.5rem;
  object-fit: contain;
  display: block;
}

.site-header__wordmark {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-graphite);
  line-height: 1;
}

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

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

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

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-xs) 0;
  font-size: var(--text-body-small);
  font-weight: 500;
  color: var(--color-graphite);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

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

.site-header__nav-link:hover {
  color: var(--color-terracotta);
}

.site-header__nav-link:hover::after,
.site-header__nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

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

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

.site-header__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-body-small);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.site-header__cta--primary {
  background-color: var(--color-terracotta);
  color: var(--color-milky-white);
  border: 1px solid var(--color-terracotta);
}

.site-header__cta--primary:hover {
  background-color: var(--color-natural-walnut);
  border-color: var(--color-natural-walnut);
  color: var(--color-milky-white);
}

.site-header__cta--secondary {
  background-color: transparent;
  color: var(--color-graphite);
  border: 1px solid var(--color-brushed-steel);
}

.site-header__cta--secondary:hover {
  background-color: var(--color-pale-mineral-blue);
  border-color: var(--color-graphite);
  color: var(--color-graphite);
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.site-header__toggle:hover {
  background-color: var(--color-pale-mineral-blue);
}

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

.site-header__toggle-line {
  display: block;
  width: 1.5rem;
  height: 2px;
  background-color: var(--color-graphite);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.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);
}

@media (max-width: 64rem) {
  .site-header__inner {
    padding-inline: 1.25rem;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-milky-white);
    border-bottom: var(--border-hairline);
    box-shadow: var(--shadow-float);
    max-height: calc(100vh - 4.5rem);
    overflow-y: auto;
    display: none;
    padding: var(--space-md) var(--space-lg);
  }

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

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

  .site-header__nav-link {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-body);
    border-radius: var(--radius-sm);
  }

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

  .site-header__nav-link:hover {
    background-color: var(--color-pale-mineral-blue);
    color: var(--color-graphite);
  }

  .site-header__nav-link[aria-current="page"] {
    background-color: var(--color-terracotta-soft);
    color: var(--color-terracotta);
  }

  .site-header__actions {
    margin-left: auto;
  }

  .site-header__toggle {
    display: flex;
  }
}

@media (max-width: 40rem) {
  .site-header__inner {
    padding-inline: var(--space-md);
    min-height: 4rem;
  }

  .site-header__logo {
    width: 2rem;
    height: 2rem;
  }

  .site-header__wordmark {
    font-size: 1.125rem;
  }

  .site-header__cta {
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--text-caption);
  }

  .site-header__cta--secondary {
    display: none;
  }

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