.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-paper-deep);
  border-bottom: 1.5px solid var(--color-graphite);
  box-shadow: var(--surface-shadow-small);
}

.site-header__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 72px;
  gap: var(--space-16);
}

.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__nav--left {
  justify-content: flex-start;
}

.site-header__nav--right {
  justify-content: flex-end;
}

.site-header__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-24);
  margin: 0;
  padding: 0;
}

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

.site-header__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: var(--space-8) var(--space-4);
  font-size: var(--text-body-size);
  line-height: var(--text-body-line-height);
  color: var(--color-graphite);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-header__link:hover {
  color: var(--color-ink-blue);
  text-decoration: underline;
  text-decoration-color: var(--color-ink-blue);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.site-header__link:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-2);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  text-decoration: none;
  color: var(--color-graphite);
  min-width: 0;
  justify-self: center;
}

.site-header__brand:hover {
  color: var(--color-graphite);
  text-decoration: none;
}

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

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  line-height: 1.2;
  font-weight: 600;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-2);
}

.site-header__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-graphite);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.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__toggle:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

.site-header__mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-paper);
  border-bottom: 1.5px solid var(--color-graphite);
  box-shadow: var(--surface-shadow-large);
  max-height: calc(100vh - 72px);
  overflow-y: auto;
  z-index: 999;
}

.site-header__mobile-nav.is-open {
  display: block;
}

.site-header__mobile-nav-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-16) var(--container-padding-mobile);
}

.site-header__mobile-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
}

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

.site-header__mobile-link {
  display: block;
  padding: var(--space-12) var(--space-16);
  font-size: var(--text-body-size);
  line-height: var(--text-body-line-height);
  color: var(--color-graphite);
  text-decoration: none;
  border-radius: var(--radius-2);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__mobile-link:hover {
  background-color: var(--color-paper-deep);
  color: var(--color-ink-blue);
  text-decoration: none;
}

.site-header__mobile-link:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
  background-color: var(--color-paper-deep);
}

@media (min-width: 768px) {
  .site-header__inner {
    padding-inline: var(--container-padding-tablet);
    min-height: 80px;
  }

  .site-header__logo {
    width: 52px;
    height: 52px;
  }

  .site-header__brand-text {
    font-size: 1.75rem;
  }

  .site-header__mobile-nav {
    max-height: calc(100vh - 80px);
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    padding-inline: var(--container-padding-desktop);
    min-height: 88px;
  }

  .site-header__logo {
    width: 56px;
    height: 56px;
  }

  .site-header__brand-text {
    font-size: 2rem;
  }

  .site-header__mobile-nav {
    max-height: calc(100vh - 88px);
  }
}

@media (max-width: 899px) {
  .site-header__inner {
    grid-template-columns: auto 1fr auto;
  }

  .site-header__nav {
    display: none;
  }

  .site-header__toggle {
    display: flex;
    justify-self: end;
  }

  .site-header__brand {
    justify-self: start;
  }
}