.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid color-mix(in srgb, var(--color-line) 80%, transparent);
  background: color-mix(in srgb, var(--color-ivory) 94%, transparent);
  backdrop-filter: blur(14px);
}

.site-header__inner {
  display: flex;
  min-height: 5.25rem;
  align-items: center;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  flex: 0 1 auto;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.04em;
  line-height: 1;
  text-decoration: none;
}

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

.site-header__logo {
  width: auto;
  height: 2.75rem;
  max-width: 3.25rem;
  flex: 0 0 auto;
  object-fit: contain;
}

.site-header__navigation {
  display: flex;
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  justify-content: center;
}

.site-header__primary-list,
.site-header__mobile-groups {
  margin: 0;
  padding: 0;
}

.site-header__primary-list {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: clamp(0.7rem, 1.4vw, 1.25rem);
  list-style: none;
}

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

.site-header__primary-list a {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  white-space: nowrap;
  color: var(--color-ink);
  font-size: var(--font-size-12);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--tracking-label);
  line-height: 1.2;
  text-decoration: none;
}

.site-header__primary-list a:hover,
.site-header__primary-list a:focus-visible { color: var(--color-cobalt); }

.site-header__contact {
  width: auto;
  min-height: 3rem;
  flex: 0 0 auto;
  padding-inline: 1rem;
  white-space: nowrap;
}

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

@media (max-width: 74.99rem) {
  .site-header__inner {
    min-height: 4.75rem;
    justify-content: space-between;
  }

  .site-header__logo {
    height: 2.35rem;
    max-width: 2.8rem;
  }

  .site-header__brand { font-size: 1rem; }

  .site-header__contact { display: none; }

  .site-header__toggle {
    display: inline-grid;
    width: 3rem;
    height: 3rem;
    flex: 0 0 3rem;
    place-content: center;
    gap: 0.28rem;
    border: 1px solid var(--color-ink);
    border-radius: var(--radius-card);
    background: var(--color-ivory);
    color: var(--color-ink);
    padding: 0;
  }

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

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) { transform: translateY(0.56rem) 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(-0.56rem) rotate(-45deg); }

  .site-header__navigation {
    position: fixed;
    top: 4.75rem;
    right: 0;
    left: 0;
    display: none;
    width: 100%;
    max-height: calc(100dvh - 4.75rem);
    overflow-y: auto;
    background: var(--color-ivory);
    padding: var(--space-5) var(--container-padding) var(--space-6);
    box-shadow: var(--shadow-subtle);
  }

  .site-header__navigation.is-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--space-6);
  }

  .site-header__primary-list {
    display: grid;
    gap: 0;
    border-top: var(--border-subtle);
  }

  .site-header__primary-list a {
    min-height: 3.4rem;
    border-bottom: var(--border-subtle);
    font-family: var(--font-heading);
    font-size: var(--font-size-18);
    letter-spacing: -0.025em;
  }

  .site-header__mobile-groups {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-5);
  }

  .site-header__mobile-groups div {
    display: grid;
    align-content: start;
    gap: var(--space-2);
  }

  .site-header__mobile-groups p {
    margin: 0 0 var(--space-1);
    font-size: var(--font-size-12);
    font-weight: var(--font-weight-bold);
    letter-spacing: var(--tracking-label);
  }

  .site-header__mobile-groups a {
    color: var(--color-ink);
    font-size: var(--font-size-14);
    font-weight: var(--font-weight-medium);
  }

  .site-header__mobile-contact {
    display: inline-flex;
    width: 100%;
  }

  body.site-header-menu-open { overflow: hidden; }
}

@media (max-width: 29.99rem) {
  .site-header__brand { gap: 0.45rem; font-size: 0.95rem; }
  .site-header__logo { height: 2.15rem; max-width: 2.5rem; }
  .site-header__mobile-groups { grid-template-columns: 1fr; }
}

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