.site-header {
  background-color: var(--color-primary-dark);
  color: var(--color-surface);
  position: relative;
  z-index: 100;
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: 72px;
  padding-block: var(--space-3);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  color: var(--color-surface);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.site-header__logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.2;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0;
  border-radius: var(--radius-small);
  color: var(--color-surface);
  background-color: transparent;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__toggle:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--color-surface);
}

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

.site-header__toggle-icon,
.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-header__toggle-icon {
  position: relative;
}

.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.site-header__toggle-icon::before {
  top: -7px;
}

.site-header__toggle-icon::after {
  top: 7px;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon {
  background-color: transparent;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::before {
  transform: translateY(7px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::after {
  transform: translateY(-7px) rotate(-45deg);
}

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

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

.site-header__nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-small);
  color: var(--color-surface);
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__nav-link:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--color-surface);
  text-decoration: none;
}

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

.site-header__actions {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-header__search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-small);
  padding: var(--space-1) var(--space-2);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__search:focus-within {
  border-color: var(--color-accent);
  background-color: rgba(255, 255, 255, 0.12);
}

.site-header__search-input {
  width: 160px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-surface);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  padding: var(--space-1) 0;
}

.site-header__search-input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.site-header__search-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-small);
  color: var(--color-surface);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__search-button:hover {
  background-color: rgba(255, 255, 255, 0.12);
  color: var(--color-surface);
}

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

.site-header__search-icon {
  width: 18px;
  height: 18px;
}

@media (max-width: 1024px) {
  .site-header__inner {
    gap: var(--space-3);
  }

  .site-header__nav-list {
    gap: var(--space-2);
  }

  .site-header__nav-link {
    padding: var(--space-2) var(--space-2);
    font-size: 14px;
  }

  .site-header__search-input {
    width: 120px;
  }
}

@media (max-width: 820px) {
  .site-header__inner {
    flex-wrap: wrap;
    min-height: 64px;
    padding-block: var(--space-2);
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    background-color: var(--color-primary-dark);
    padding: var(--space-4) var(--container-gutter) var(--space-6);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    z-index: 99;
  }

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

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
  }

  .site-header__nav-link {
    display: flex;
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: 16px;
    white-space: normal;
    word-break: break-word;
  }

  .site-header__actions {
    margin-left: auto;
  }

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

@media (max-width: 480px) {
  .site-header__brand-text {
    display: none;
  }

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

  .site-header__search-input {
    width: 80px;
  }
}