.site-header {
  position: relative;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

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

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

.site-header__logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--color-ink);
}

.site-header__toggle {
  display: flex;
  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-stone);
}

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

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

.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: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  z-index: 99;
}

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

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

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

.site-header__link {
  display: block;
  padding: var(--space-sm) var(--container-padding-mobile);
  font-size: var(--text-body);
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: none;
  transition: background-color var(--transition-color), color var(--transition-color);
}

.site-header__link:hover {
  background-color: var(--color-stone);
  color: var(--color-terracotta);
}

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

@media (min-width: 768px) {
  .site-header__inner {
    padding-inline: var(--container-padding-tablet);
    min-height: 72px;
  }

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

  .site-header__brand-text {
    font-size: 1.25rem;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    display: block;
    position: static;
    max-height: none;
    overflow-y: visible;
    border-bottom: none;
    background-color: transparent;
  }

  .site-header__list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-lg);
    padding: 0;
  }

  .site-header__item {
    margin: 0;
  }

  .site-header__link {
    padding: var(--space-xs) 0;
    font-size: var(--text-small);
    font-weight: 500;
    color: var(--color-ink);
    text-decoration: none;
    position: relative;
  }

  .site-header__link::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    background-color: var(--color-terracotta);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-transform);
  }

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

  .site-header__link:hover {
    background-color: transparent;
    color: var(--color-terracotta);
  }

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

@media (min-width: 1024px) {
  .site-header__list {
    gap: var(--space-xl);
  }
}