.site-header {
  position: relative;
  z-index: 100;
  background-color: var(--color-paper-bg);
  border-bottom: 1px solid var(--color-graphite-border);
  box-shadow: var(--shadow-elevation-subtle);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 64px;
  padding-block: var(--space-sm);
}

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

.site-header__brand:hover {
  color: var(--color-ink-text);
}

.site-header__logo {
  width: 34px;
  height: 34px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

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

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

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-ink-text);
  border-radius: 1px;
  transition: transform var(--transition-hover), opacity var(--transition-hover);
}

.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: center;
  min-width: 0;
}

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

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

.site-header__nav-link {
  display: inline-block;
  padding-block: var(--space-xs);
  font-size: var(--text-nav-size);
  line-height: var(--text-nav-line-height);
  font-weight: var(--text-nav-weight);
  color: var(--color-ink-text);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-hover), border-color var(--transition-hover);
  border-bottom: 2px solid transparent;
}

.site-header__nav-link:hover {
  color: var(--color-oxblood-text);
  border-bottom-color: var(--color-brass);
}

.site-header__nav-link:focus-visible {
  outline: var(--border-focus);
  outline-offset: 2px;
  border-radius: var(--radius-input);
}

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

.site-header__search {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  flex-shrink: 0;
  margin-left: var(--space-md);
}

.site-header__search-input {
  width: 160px;
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--text-small-size);
  line-height: var(--text-small-line-height);
  border: 1px solid var(--color-graphite-border);
  border-radius: var(--radius-input);
  background-color: var(--color-paper-bg);
  color: var(--color-ink-text);
  transition: border-color var(--transition-hover), width var(--transition-hover);
}

.site-header__search-input:focus {
  border-color: var(--color-ink-border);
  width: 200px;
}

.site-header__search-input::placeholder {
  color: var(--color-stone-text);
}

.site-header__search-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-input);
  cursor: pointer;
  color: var(--color-ink-text);
  transition: background-color var(--transition-hover), color var(--transition-hover);
}

.site-header__search-button:hover {
  background-color: var(--color-paper-deep-bg);
  color: var(--color-oxblood-text);
}

.site-header__search-button:focus-visible {
  outline: var(--border-focus);
  outline-offset: 2px;
}

.site-header__search-icon {
  display: block;
}

@media (max-width: 1024px) {
  .site-header__inner {
    flex-wrap: wrap;
  }

  .site-header__brand {
    flex: 0 0 auto;
  }

  .site-header__toggle {
    display: flex;
    order: 3;
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    max-width: 85vw;
    background-color: var(--color-paper-bg);
    box-shadow: -2px 0 8px rgba(37, 49, 59, 0.12);
    transform: translateX(100%);
    transition: transform var(--transition-drawer);
    z-index: 200;
    display: block;
    overflow-y: auto;
    padding: var(--space-lg);
    flex: none;
    justify-content: initial;
  }

  .site-header__nav.is-open {
    transform: translateX(0);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-sm) var(--space-xs);
    border-bottom: none;
    border-left: 2px solid transparent;
    font-size: var(--text-body-size);
    line-height: var(--text-body-line-height);
  }

  .site-header__nav-link:hover {
    border-left-color: var(--color-brass);
  }

  .site-header__nav-link[aria-current="page"] {
    border-left-color: var(--color-oxblood);
    background-color: var(--color-paper-deep-bg);
  }

  .site-header__search {
    order: 2;
    flex: 1 1 auto;
    margin-left: 0;
  }

  .site-header__search-input {
    width: 100%;
  }

  .site-header__search-input:focus {
    width: 100%;
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    min-height: 56px;
    padding-block: var(--space-xs);
  }

  .site-header__logo {
    width: 28px;
    height: 28px;
  }

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

  .site-header__search-input {
    font-size: var(--text-body-size);
    line-height: var(--text-body-line-height);
  }
}

@media (max-width: 480px) {
  .site-header__brand-text {
    font-size: 0.9375rem;
  }

  .site-header__search-input {
    padding: var(--space-2xs) var(--space-xs);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav {
    transition-duration: 0.01ms;
  }

  .site-header__toggle-line {
    transition-duration: 0.01ms;
  }
}