.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 72px;
  border-bottom: 1px solid var(--color-border);
  background: rgba(17, 21, 34, 0.97);
  box-shadow: var(--shadow-raised);
}

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

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

.site-header__brand:hover { color: var(--color-text); }

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

.site-header__brand-copy {
  display: grid;
  min-width: 0;
  gap: 1px;
  line-height: 1;
}

.site-header__brand-name {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
}

.site-header__brand-tagline {
  overflow: hidden;
  color: var(--color-moon-300);
  font-size: 0.6875rem;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-header__nav {
  display: flex;
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-4);
}

.site-header__nav-list {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none !important;
}

.site-header__nav-list li,
.site-header__nav-list li + li {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  color: var(--color-moon-300);
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__nav-list a:hover,
.site-header__nav-list a[aria-current="page"] {
  color: var(--color-amber-400);
}

.site-header__download {
  flex: 0 0 auto;
  white-space: nowrap;
}

.site-header .nav-toggle {
  display: none;
  flex: 0 0 auto;
}

.site-header__mobile-only { display: none !important; }

@media (max-width: 62rem) {
  .site-header {
    min-height: 60px;
  }

  .site-header__inner {
    position: relative;
    min-height: 60px;
    justify-content: space-between;
  }

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

  .site-header__brand-name { font-size: 1rem; }
  .site-header__brand-tagline { display: none; }

  .site-header .nav-toggle { display: flex; }

  .site-header .nav-toggle[aria-expanded="true"] {
    border-color: var(--color-amber-400);
    color: var(--color-amber-200);
  }

  .site-header__nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    max-height: calc(100vh - 60px);
    padding: var(--space-4) var(--container-padding);
    overflow-y: auto;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-ink-900);
    box-shadow: var(--shadow-raised);
  }

  .site-header__nav.is-open { display: grid; gap: var(--space-4); }

  .site-header__nav-list {
    display: grid;
    gap: 0;
  }

  .site-header__nav-list li,
  .site-header__nav-list li + li {
    display: block;
    border-bottom: 1px solid var(--color-border);
  }

  .site-header__nav-list a {
    width: 100%;
    min-height: 3rem;
    font-size: var(--font-size-small);
  }

  .site-header__mobile-only { display: block !important; }
  .site-header__download { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav { scroll-behavior: auto; }
}