.site-header {
  position: sticky;
  z-index: 80;
  top: 0;
  width: 100%;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-pearl-white);
}

.site-header__inner {
  display: flex;
  position: relative;
  align-items: center;
  justify-content: space-between;
  min-height: 4.25rem;
  gap: var(--space-3);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  gap: 0.625rem;
  color: var(--color-deep-graphite);
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__logo {
  width: 2.125rem;
  height: 2.125rem;
  flex: 0 0 2.125rem;
  object-fit: contain;
}

.site-header__brand-name {
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  min-width: 2.75rem;
  min-height: 2.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-pearl-white);
  color: var(--color-deep-graphite);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__toggle:hover,
.site-header__toggle[aria-expanded="true"] {
  border-color: var(--color-electric-turquoise);
  background: var(--color-pale-sky);
}

.site-header__toggle-lines {
  display: grid;
  width: 1.25rem;
  gap: 0.25rem;
}

.site-header__toggle-lines span {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: var(--radius-full);
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:first-child {
  transform: translateY(0.375rem) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:last-child {
  transform: translateY(-0.375rem) rotate(-45deg);
}

.site-header__nav {
  position: absolute;
  top: calc(100% + 1px);
  right: 0;
  left: 0;
  display: none;
  max-height: calc(100vh - 4.25rem);
  overflow-y: auto;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-pearl-white);
  box-shadow: var(--shadow-card);
}

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

.site-header__primary-links {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: var(--space-3) var(--gutter) var(--space-4);
  list-style: none;
}

.site-header__primary-links li,
.site-header__primary-links li + li {
  margin: 0;
  padding: 0;
}

.site-header__primary-links a {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  color: var(--color-deep-graphite);
  font-size: var(--text-16);
  font-weight: 700;
  line-height: 1.25;
  text-decoration: none;
}

.site-header__primary-links a:hover,
.site-header__primary-links a[aria-current="page"] {
  background: var(--color-pale-sky);
  color: var(--color-royal-purple);
}

@media (min-width: 62rem) {
  .site-header__inner {
    min-height: 4.75rem;
    gap: var(--space-5);
  }

  .site-header__brand {
    font-size: var(--text-20);
  }

  .site-header__logo {
    width: 2.5rem;
    height: 2.5rem;
    flex-basis: 2.5rem;
  }

  .site-header__toggle {
    display: none;
  }

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

  .site-header__primary-links {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.125rem;
    margin: 0;
    padding: 0;
  }

  .site-header__primary-links a {
    min-height: 2.75rem;
    padding: 0.5rem 0.625rem;
    font-size: var(--text-14);
    white-space: nowrap;
  }
}

@media (min-width: 70rem) {
  .site-header__primary-links {
    gap: var(--space-1);
  }

  .site-header__primary-links a {
    padding-inline: 0.75rem;
    font-size: var(--text-16);
  }
}

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