.site-header {
  position: relative;
  z-index: 100;
  background-color: var(--color-paper);
  border-bottom: var(--border-thin);
}

.site-header__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 72px;
}

.site-header__nav {
  flex: 1;
  min-width: 0;
}

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

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

.site-header__list {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

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

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

.site-header__link {
  display: inline-block;
  padding: var(--space-2) 0;
  font-size: var(--text-small-size);
  line-height: var(--text-small-line-height);
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-color), text-decoration-color var(--transition-color);
  text-decoration-color: transparent;
  text-underline-offset: 3px;
}

.site-header__link:hover {
  color: var(--color-terracotta);
  text-decoration: underline;
  text-decoration-color: var(--color-terracotta);
  text-decoration-thickness: 1px;
}

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

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
  min-width: 0;
}

.site-header__brand:hover {
  text-decoration: none;
}

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

.site-header__logo {
  width: 56px;
  height: 56px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: var(--text-h3-size);
  line-height: 1.2;
  font-weight: 600;
  color: var(--color-forest);
  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-sm);
  transition: background-color var(--transition-color);
}

.site-header__toggle:hover {
  background-color: var(--color-linen);
}

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

.site-header__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-forest);
  border-radius: 1px;
  transition: transform 200ms ease, opacity 200ms ease;
}

.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__mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-paper);
  border-bottom: var(--border-thin);
  box-shadow: var(--shadow-minimal);
  max-height: calc(100vh - 72px);
  overflow-y: auto;
  z-index: 99;
}

.site-header__mobile-nav[data-open] {
  display: block;
}

.site-header__mobile-nav-inner {
  padding: var(--space-4) var(--container-gutter);
}

.site-header__mobile-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

.site-header__mobile-link {
  display: block;
  padding: var(--space-3) var(--space-2);
  font-size: var(--text-body-size);
  line-height: var(--text-body-line-height);
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-color), color var(--transition-color);
}

.site-header__mobile-link:hover {
  background-color: var(--color-linen);
  color: var(--color-terracotta);
  text-decoration: none;
}

.site-header__mobile-link:focus-visible {
  outline: var(--focus-outline-width) solid var(--focus-outline-color);
  outline-offset: var(--focus-outline-offset);
}

@media (max-width: 900px) {
  .site-header__nav {
    display: none;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__inner {
    justify-content: space-between;
  }

  .site-header__brand {
    order: 1;
  }

  .site-header__toggle {
    order: 2;
  }

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

  .site-header__brand-text {
    font-size: var(--text-body-size);
  }
}

@media (max-width: 480px) {
  .site-header__inner {
    min-height: 64px;
  }

  .site-header__mobile-nav {
    max-height: calc(100vh - 64px);
  }
}