.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 40;
}

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

.site-header__logo {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-sm) 0;
  line-height: 1;
  text-decoration: none;
}

.site-header__logo-name {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

.site-header__logo-tag {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 300;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.site-header__logo:hover .site-header__logo-name {
  color: var(--color-primary-hover);
}

.site-header__nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 85%;
  max-width: 320px;
  z-index: 30;
  background: var(--color-surface);
  box-shadow: var(--shadow-panel);
  padding: calc(64px + var(--space-md)) var(--space-lg) var(--space-lg);
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateX(100%);
  transition: transform var(--transition-base);
}

.site-header__nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.site-header__backdrop {
  position: fixed;
  inset: 0;
  z-index: 25;
  background: var(--color-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.site-header__backdrop--visible {
  opacity: 1;
  visibility: visible;
}

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  min-height: 44px;
  line-height: 28px;
  color: var(--color-text);
  font-size: 0.9375rem;
}

.site-header__nav-link:hover {
  color: var(--color-primary);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-left: auto;
}

.site-header__search {
  display: none;
  position: relative;
}

.site-header__search-input {
  width: 100%;
  max-width: 300px;
  min-height: 40px;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-soft);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.site-header__search-input:focus {
  border-color: var(--color-primary);
  background: var(--color-surface);
  outline: none;
}

.site-header__search-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: var(--space-sm);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.site-header__search-btn:hover {
  background: var(--color-accent);
  color: var(--color-primary);
}

.site-header__burger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.site-header__burger:hover {
  background: var(--color-accent);
  color: var(--color-primary);
}

.site-header__burger-box {
  position: relative;
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}

.site-header__burger-box::before,
.site-header__burger-box::after {
  content: '';
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-fast), top var(--transition-fast), bottom var(--transition-fast);
}

.site-header__burger-box::before {
  top: -7px;
}

.site-header__burger-box::after {
  bottom: -7px;
}

.site-header__burger[aria-expanded="true"] .site-header__burger-box {
  background: transparent;
}

.site-header__burger[aria-expanded="true"] .site-header__burger-box::before {
  top: 0;
  transform: rotate(45deg);
}

.site-header__burger[aria-expanded="true"] .site-header__burger-box::after {
  bottom: 0;
  transform: rotate(-45deg);
}

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

@media (min-width: 768px) {
  .site-header__nav {
    position: static;
    width: auto;
    max-width: none;
    background: transparent;
    box-shadow: none;
    padding: 0;
    overflow: visible;
    transform: none;
    transition: none;
  }

  .site-header__nav-list {
    flex-direction: row;
    gap: var(--space-md);
  }

  .site-header__backdrop {
    display: none;
  }

  .site-header__search {
    display: block;
  }

  .site-header__search-btn {
    display: none;
  }

  .site-header__burger {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__burger-box,
  .site-header__burger-box::before,
  .site-header__burger-box::after {
    transition: none;
  }
}