.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-glass-fill);
  border-bottom: 1px solid var(--color-border-subtle);
}

.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-md);
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-sm) var(--container-pad-mobile);
  min-height: 64px;
}

.site-header__nav {
  display: flex;
  align-items: center;
  min-width: 0;
}

.site-header__nav--left {
  justify-content: flex-start;
}

.site-header__nav--right {
  justify-content: flex-end;
}

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

.site-header__item {
  margin: 0;
  padding: 0;
  min-width: 0;
  flex-shrink: 1;
}

.site-header__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-xs);
  font-family: var(--font-body);
  font-size: var(--text-body-small-size);
  font-weight: var(--weight-medium);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}

.site-header__link:hover {
  color: var(--color-cyan-glow);
  text-shadow: var(--shadow-cyan-glow);
}

.site-header__link:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-ring-offset);
}

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

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

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: var(--text-h4-size);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-h4);
  color: var(--color-text-primary);
  white-space: nowrap;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  justify-self: end;
  min-width: 0;
  flex-shrink: 0;
}

.site-header__age-tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--text-mono-micro-size);
  line-height: 1;
  letter-spacing: var(--tracking-mono-micro);
  text-transform: uppercase;
  font-weight: var(--weight-medium);
  border: 1px solid var(--color-pink-neon);
  border-radius: var(--radius-input);
  color: var(--color-pink-neon);
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-input);
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header__toggle:hover {
  border-color: var(--color-cyan-glow);
  box-shadow: var(--shadow-cyan-glow);
}

.site-header__toggle:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-ring-offset);
}

.site-header__toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-cyan-glow);
  transition: transform var(--transition-medium), opacity var(--transition-medium);
}

.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__mobile-nav {
  display: none;
  position: fixed;
  inset: 64px 0 0;
  z-index: 1100;
  background-color: rgba(10, 10, 15, 0.98);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  overflow-y: auto;
  padding: var(--space-xl) var(--container-pad-mobile);
  box-sizing: border-box;
}

.site-header__mobile-nav.is-open {
  display: block;
}

.site-header__mobile-nav-inner {
  max-width: var(--container-max);
  margin-inline: auto;
}

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

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

.site-header__mobile-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-body-large-size);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-mono-label);
  text-transform: uppercase;
  color: var(--color-text-primary);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__mobile-link:hover {
  color: var(--color-cyan-glow);
  border-left-color: var(--color-cyan-glow);
  background-color: rgba(0, 229, 255, 0.05);
}

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

@media (max-width: 63.9375rem) {
  .site-header__inner {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-sm);
  }

  .site-header__nav {
    display: none;
  }

  .site-header__brand {
    justify-self: center;
  }

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

  .site-header__brand-text {
    font-size: var(--text-h4-size);
  }

  .site-header__toggle {
    display: flex;
  }
}

@media (min-width: 40rem) {
  .site-header__inner {
    padding-inline: var(--container-pad-tablet);
  }
}

@media (min-width: 64rem) {
  .site-header__inner {
    padding-inline: var(--container-pad-desktop);
  }
}