.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-ivory);
  border-bottom: 1px solid var(--color-border-navy);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.site-header__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-deep-navy);
  flex-shrink: 0;
}

.site-header__logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: var(--text-heading-letter-spacing);
  color: var(--color-deep-navy);
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: 1001;
}

.site-header__toggle-icon,
.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-deep-navy);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  position: relative;
}

.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.site-header__toggle-icon::before {
  top: -7px;
}

.site-header__toggle-icon::after {
  top: 7px;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon {
  background-color: transparent;
}

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

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

.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-focus-outline);
  outline-offset: 2px;
}

.site-header__nav {
  display: block;
}

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

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

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-2) 0;
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-deep-navy);
  text-decoration: none;
  position: relative;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

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

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

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

.site-header__nav-link:focus-visible {
  outline: 2px solid var(--color-focus-outline);
  outline-offset: 2px;
}

@media (max-width: 991px) {
  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    max-width: 100%;
    background-color: var(--color-ivory);
    box-shadow: -4px 0 16px rgba(0, 0, 0, 0.1);
    padding: var(--space-6) var(--space-4) var(--space-4);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-fast);
    z-index: 1000;
  }

  .site-header__nav.is-open {
    transform: translateX(0);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-3) var(--space-2);
    font-size: 1.125rem;
    border-bottom: 1px solid var(--color-border-navy);
  }

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

@media (max-width: 767px) {
  .site-header__inner {
    min-height: 56px;
  }

  .site-header__logo {
    width: 32px;
    height: 32px;
  }

  .site-header__brand-text {
    display: none;
  }
}