.site-header {
  position: sticky;
  z-index: 800;
  top: 0;
  border-bottom: 1px solid var(--border-technical);
  background: rgba(244, 247, 248, 0.97);
  color: var(--color-navy-ink);
}

.site-header__inner {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-atlantic-navy);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__logo {
  width: 1.875rem;
  height: 1.875rem;
  flex: 0 0 1.875rem;
  object-fit: contain;
}

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

.site-header__toggle {
  display: inline-grid;
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 2.75rem;
  place-content: center;
  gap: 0.3125rem;
  padding: 0;
  border: 1px solid var(--color-horizon-blue);
  border-radius: var(--radius-control);
  background: transparent;
  color: var(--color-horizon-blue);
}

.site-header__toggle:hover,
.site-header--open .site-header__toggle {
  background: var(--color-horizon-blue);
  color: var(--color-paper-white);
}

.site-header__toggle-line {
  display: block;
  width: 1.1875rem;
  height: 1px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header--open .site-header__toggle-line:nth-child(1) {
  transform: translateY(0.375rem) rotate(45deg);
}

.site-header--open .site-header__toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header--open .site-header__toggle-line:nth-child(3) {
  transform: translateY(-0.375rem) rotate(-45deg);
}

.site-header__navigation {
  position: absolute;
  top: 100%;
  right: 0;
  left: 0;
  display: none;
  max-height: calc(100dvh - 4.5rem);
  overflow-y: auto;
  border-bottom: 1px solid var(--border-technical);
  background: var(--color-frosted-white);
}

.site-header--open .site-header__navigation {
  display: grid;
}

.site-header__nav-list,
.site-header__mobile-links {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list {
  gap: 0;
  padding: var(--space-3) var(--gutter);
}

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

.site-header__nav-list a,
.site-header__contact,
.site-header__mobile-links a {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  color: var(--color-navy-ink);
  font-size: var(--font-size-meta);
  font-weight: 600;
  text-decoration: none;
}

.site-header__nav-list a {
  border-bottom: 1px solid rgba(141, 175, 190, 0.55);
}

.site-header__nav-list a::before {
  width: 1.25rem;
  color: var(--color-copper-dark);
  content: "→";
  opacity: 0;
  transform: translateX(-0.5rem);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.site-header__nav-list a:hover::before,
.site-header__nav-list a:focus-visible::before {
  opacity: 1;
  transform: translateX(0);
}

.site-header__contact {
  justify-content: space-between;
  gap: var(--space-2);
  margin: var(--space-3) var(--gutter);
  padding: 0 var(--space-3);
  border: 1px solid var(--color-horizon-blue);
  border-radius: var(--radius-control);
  background: var(--color-horizon-blue);
  color: var(--color-paper-white);
}

.site-header__contact:hover {
  background: var(--color-atlantic-navy);
  color: var(--color-paper-white);
}

.site-header__mobile-links {
  gap: var(--space-2);
  padding: var(--space-4) var(--gutter) var(--space-6);
  border-top: 1px solid var(--border-technical);
}

.site-header__mobile-links a {
  min-height: 2.25rem;
  color: var(--color-muted-steel);
  font-size: var(--font-size-caption);
}

@media (max-width: 23.4375rem) {
  .site-header__brand-name {
    display: none;
  }
}

@media (min-width: 68.75rem) {
  .site-header__inner {
    min-height: 4.75rem;
    gap: var(--space-6);
  }

  .site-header__logo {
    width: 2.25rem;
    height: 2.25rem;
    flex-basis: 2.25rem;
  }

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

  .site-header__toggle {
    display: none;
  }

  .site-header__navigation {
    position: static;
    display: flex;
    min-width: 0;
    max-height: none;
    align-items: center;
    gap: var(--space-4);
    overflow: visible;
    border: 0;
    background: transparent;
  }

  .site-header__nav-list {
    display: flex;
    min-width: 0;
    align-items: center;
    gap: var(--space-4);
    padding: 0;
  }

  .site-header__nav-list a,
  .site-header__contact {
    min-height: 2.75rem;
    white-space: nowrap;
  }

  .site-header__nav-list a {
    border: 0;
    color: var(--color-navy-ink);
  }

  .site-header__nav-list a::before {
    position: absolute;
    width: auto;
    margin-left: -0.75rem;
  }

  .site-header__contact {
    margin: 0;
  }

  .site-header__mobile-links {
    display: none;
  }
}