.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 52px;
  background: #fff;
  border-bottom: 1px solid #eee;
  font-family: 'Segoe UI', system-ui, sans-serif;
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-nav .nav-brand {
  font-size: 18px;
  font-weight: 800;
  color: #e8432a;
  text-decoration: none;
  letter-spacing: -0.5px;
}
.site-nav .nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.site-nav .nav-links a {
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 8px;
  color: #666;
  transition: background 0.15s, color 0.15s;
}
.site-nav .nav-links a:hover {
  background: #f5f5f5;
  color: #1a1a1a;
}
.site-nav .nav-links a.active {
  background: #e8432a;
  color: #fff;
}
.site-nav .nav-links a.nav-slide {
  color: #2563eb;
}
.site-nav .nav-links a.nav-slide:hover {
  background: #eff6ff;
  color: #1d4ed8;
}
.site-nav .nav-sep {
  width: 1px;
  height: 20px;
  background: #e5e5e5;
  margin: 0 6px;
}