.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(7, 10, 18, 0.85);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--border-subtle);
  height: 72px;
  display: flex;
  align-items: center;
}

@supports not ((backdrop-filter: blur(18px)) or (-webkit-backdrop-filter: blur(18px))) {
  .site-header {
    background-color: rgba(7, 10, 18, 0.95);
  }
}

.site-header__inner {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-width: 0;
}

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

.site-header__logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__wordmark {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  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: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-control);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  border-color: var(--border-glow);
  background-color: rgba(148, 163, 255, 0.06);
}

.site-header__toggle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.site-header__toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.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;
  min-width: 0;
}

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

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

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-xs) 0;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
  position: relative;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background-color: var(--accent-indigo);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

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

.site-header__nav-link:hover::after {
  transform: scaleX(1);
}

.site-header__nav-link:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: 2px;
}

@media (max-width: 1023px) {
  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--surface-glass-strong);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    backdrop-filter: blur(18px) saturate(140%);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-lg);
    overflow-y: auto;
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform var(--transition-slow), visibility var(--transition-slow);
    z-index: 999;
  }

  @supports not ((backdrop-filter: blur(18px)) or (-webkit-backdrop-filter: blur(18px))) {
    .site-header__nav {
      background-color: rgba(24, 32, 62, 0.98);
    }
  }

  .site-header__nav.is-open {
    transform: translateX(0);
    visibility: visible;
    min-height: 650px;
  }

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

  .site-header__nav-item {
    flex-shrink: 0;
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-md) var(--space-sm);
    font-size: 1rem;
    letter-spacing: 0.08em;
    border-bottom: 1px solid var(--border-subtle);
  }

  .site-header__nav-link::after {
    display: none;
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    padding-inline: var(--container-padding-desktop);
  }

  .site-header__logo {
    width: 40px;
    height: 40px;
  }

  .site-header__wordmark {
    font-size: 0.875rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__toggle-line,
  .site-header__nav {
    transition: none;
  }
}