.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-paper);
  border-block-end: var(--border-default);
  height: var(--header-height-mobile);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  height: 100%;
  min-width: 0;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  min-width: 0;
  flex-shrink: 1;
  text-decoration: none;
  color: var(--color-ink);
}

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

.site-header__logo {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__menu-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: var(--radius-xs);
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color var(--transition-fast);
}

.site-header__menu-toggle:hover {
  background-color: var(--color-oxblood-faint);
}

.site-header__menu-toggle:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

.site-header__menu-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-ink);
  transition: transform var(--transition-medium), opacity var(--transition-medium);
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header__navigation {
  position: fixed;
  inset: 0 0 0 auto;
  width: min(320px, 85vw);
  max-width: 100%;
  height: 100dvh;
  background-color: var(--color-deep-slate);
  padding: var(--space-xl) var(--space-lg);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  transform: translateX(100%);
  visibility: hidden;
  transition: transform var(--transition-medium), visibility var(--transition-medium);
  z-index: 1001;
}

.site-header__navigation.is-open {
  transform: translateX(0);
  visibility: visible;
}

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

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

.site-header__nav-link {
  display: block;
  padding: var(--space-sm) var(--space-xs);
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-paper);
  text-decoration: none;
  border-radius: var(--radius-xs);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__nav-link:hover {
  background-color: rgba(242, 239, 231, 0.08);
  color: var(--color-paper);
  text-decoration: none;
}

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

@media (min-width: 900px) {
  .site-header {
    height: var(--header-height-desktop);
  }

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

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

  .site-header__menu-toggle {
    display: none;
  }

  .site-header__navigation {
    position: static;
    inset: auto;
    width: auto;
    height: auto;
    background-color: transparent;
    padding: 0;
    overflow: visible;
    transform: none;
    visibility: visible;
    transition: none;
    z-index: auto;
  }

  .site-header__nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-lg);
  }

  .site-header__nav-link {
    padding: var(--space-xs) 0;
    font-size: var(--text-small-size);
    color: var(--color-ink);
    border-radius: 0;
    position: relative;
  }

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

  .site-header__nav-link:hover {
    background-color: transparent;
    color: var(--color-ink);
  }

  .site-header__nav-link:hover::after,
  .site-header__nav-link[aria-current="page"]::after {
    transform: scaleX(1);
  }

  .site-header__nav-link[aria-current="page"] {
    color: var(--color-oxblood);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__navigation,
  .site-header__menu-toggle-line,
  .site-header__nav-link::after {
    transition: none;
  }
}