.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-default);
  background: rgba(8, 6, 17, 0.96);
  box-shadow: 0 1px 0 rgba(91, 231, 242, 0.05);
  backdrop-filter: blur(14px);
}

.site-header__inner {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  flex: 0 1 auto;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-primary);
  text-decoration: none;
}

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

.site-header__mark {
  width: 2.375rem;
  height: 2.375rem;
  flex: 0 0 2.375rem;
  object-fit: contain;
}

.site-header__brand-copy {
  display: grid;
  min-width: 0;
  gap: 0.0625rem;
}

.site-header__name {
  overflow: hidden;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.15;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-header__descriptor {
  color: var(--color-text-muted);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-header__nav {
  min-width: 0;
  margin-left: auto;
}

.site-header__nav-list {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-item,
.site-header__nav-item + .site-header__nav-item {
  display: flex;
  min-width: 0;
  margin: 0;
  padding: 0;
}

.site-header__nav-link,
.site-header__play-link,
.site-header__play-action {
  display: inline-flex;
  min-height: 4.5rem;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-3);
  border-top: 2px solid transparent;
  border-bottom: 2px solid transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-heading);
  font-size: var(--text-12);
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--transition-fast), color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__nav-link:hover,
.site-header__play-link:hover {
  border-bottom-color: var(--color-cyan);
  color: var(--color-cyan);
  text-decoration: none;
}

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

.site-header__play-link,
.site-header__play-action {
  color: var(--color-magenta-bright);
}

.site-header__play-link:hover {
  border-bottom-color: var(--color-magenta-bright);
}

.site-header__play-action {
  display: none;
  min-height: 2.75rem;
  margin-left: auto;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-magenta);
  background: var(--color-magenta);
  color: var(--color-magenta-ink);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
}

.site-header__play-action:hover {
  border-color: var(--color-magenta-bright);
  background: var(--color-magenta-bright);
  color: var(--color-magenta-ink);
  text-decoration: none;
}

.site-header__toggle,
.site-header__nav-item--mobile-only {
  display: none;
}

@media (max-width: 71.99rem) {
  .site-header__inner {
    min-height: 4rem;
  }

  .site-header__mark {
    width: 2rem;
    height: 2rem;
    flex-basis: 2rem;
  }

  .site-header__name {
    font-size: 0.8125rem;
  }

  .site-header__descriptor {
    display: none;
  }

  .site-header__toggle {
    display: inline-flex;
    width: 2.75rem;
    min-width: 2.75rem;
    height: 2.75rem;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 0.25rem;
    margin-left: auto;
    padding: 0;
    border: 1px solid var(--border-default);
    border-radius: 0;
    background: var(--surface-default);
  }

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

  .site-header__toggle-line {
    display: block;
    width: 1.125rem;
    height: 1px;
    background: var(--color-text-primary);
    transition: transform var(--transition-fast), opacity var(--transition-fast), background-color var(--transition-fast);
  }

  .site-header__toggle[aria-expanded="true"] {
    border-color: var(--color-magenta);
    background: var(--color-indigo);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line {
    background: var(--color-magenta-bright);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
    transform: translateY(0.3125rem) 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(-0.3125rem) rotate(-45deg);
  }

  .site-header__play-action {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    right: max(1rem, calc((100vw - var(--container-max)) / 2));
    left: max(1rem, calc((100vw - var(--container-max)) / 2));
    display: none;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    border: 1px solid var(--border-default);
    border-top: 0;
    background: var(--surface-default);
    box-shadow: var(--shadow-floating);
  }

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

  .site-header__nav-list {
    display: grid;
    gap: 0;
    padding: var(--space-2);
  }

  .site-header__nav-item,
  .site-header__nav-item + .site-header__nav-item,
  .site-header__nav-item--mobile-only {
    display: block;
  }

  .site-header__nav-link,
  .site-header__play-link {
    width: 100%;
    min-height: 3rem;
    justify-content: flex-start;
    padding: 0.75rem var(--space-3);
    border-top: 0;
    border-bottom: 1px solid transparent;
    font-size: var(--text-14);
  }

  .site-header__nav-link[aria-current="page"] {
    border-left: 2px solid var(--color-magenta);
    background: var(--color-indigo);
  }

  .site-header__play-link {
    margin-top: var(--space-2);
    border: 1px solid var(--color-magenta);
    background: rgba(240, 42, 155, 0.09);
  }
}

@media (max-width: 29.99rem) {
  .site-header__inner {
    gap: var(--space-2);
  }

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

  .site-header__play-action {
    padding-inline: 0.5rem;
    font-size: 0.625rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header {
    backdrop-filter: none;
  }
}