.site-header {
  position: relative;
  z-index: 100;
  background-color: var(--color-surface-white);
  border-block-end: var(--border-width-thin) solid var(--color-border-subtle);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-gutter);
  min-height: 72px;
}

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

.site-header__brand:hover,
.site-header__brand:focus-visible {
  color: var(--color-signal-blue);
}

.site-header__brand:focus-visible {
  outline: var(--border-width-focus) solid var(--color-focus-outline);
  outline-offset: 2px;
  border-radius: var(--radius-small);
}

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

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

.site-header__toggle:hover {
  background-color: rgba(0, 102, 179, 0.08);
}

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

.site-header__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-deep-navy);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.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);
}

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

.site-header__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__item {
  margin: 0;
  padding: 0;
}

.site-header__item + .site-header__item {
  margin: 0;
}

.site-header__link {
  display: inline-flex;
  align-items: center;
  min-height: var(--min-touch-target);
  padding: 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-deep-navy);
  white-space: nowrap;
  border-radius: var(--radius-small);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__link:hover {
  color: var(--color-signal-blue);
  background-color: rgba(0, 102, 179, 0.06);
}

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

@media (max-width: 1024px) {
  .site-header__inner {
    min-height: 64px;
  }

  .site-header__logo {
    width: 40px;
    height: 40px;
  }

  .site-header__brand-text {
    font-size: 1.125rem;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-surface-white);
    border-block-end: var(--border-width-thin) solid var(--color-border-subtle);
    box-shadow: var(--shadow-soft);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    display: none;
    padding: var(--space-3) var(--container-gutter);
  }

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

  .site-header__list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
  }

  .site-header__item {
    width: 100%;
  }

  .site-header__link {
    display: flex;
    width: 100%;
    min-height: var(--min-touch-target);
    padding: var(--space-2) var(--space-3);
    justify-content: flex-start;
    font-size: var(--text-body-size);
    letter-spacing: 0.02em;
    text-transform: none;
    border-radius: var(--radius-small);
  }

  .site-header__link:hover {
    background-color: rgba(0, 102, 179, 0.08);
  }
}

@media (max-width: 480px) {
  .site-header__inner {
    min-height: 56px;
    padding-inline: 0.75rem;
  }

  .site-header__logo {
    width: 36px;
    height: 36px;
  }

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

  .site-header__nav {
    max-height: calc(100vh - 56px);
    padding: var(--space-2) 0.75rem;
  }
}