.site-header { background-color: #ffffff; padding: 12px 0; position: sticky; top: 0; z-index: 100; box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06); border-bottom: 1px solid #e0e0e6; }
.site-header .header-inner { display: flex; align-items: center; justify-content: space-between; }
.site-header .header-logo { font-size: 18px; font-weight: 700; color: #1a1a2e; letter-spacing: -0.5px; display: flex; align-items: center; gap: 8px; }
.site-header .header-logo img { border-radius: 4px; }
.site-header .header-logo span { color: #1F25DB; }
.site-header .header-logo .maple { color: #cc2222; font-size: 16px; margin-left: -2px; }
.site-header .header-nav { display: none; }
.site-header .header-nav .nav-list { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; }
.site-header .header-nav .nav-link { color: #444444; font-size: 14px; font-weight: 500; padding: 8px 14px; border-radius: 8px; transition: all 0.2s; display: block; }
.site-header .header-nav .nav-link:hover { background-color: #f0f0ff; color: #1F25DB; text-decoration: none; }
.site-header .header-nav .nav-link.active { background-color: #ededff; color: #1F25DB; font-weight: 600; }
.site-header .mobile-menu-toggle { color: #1a1a2e; font-size: 24px; cursor: pointer; display: block; padding: 4px; }
.site-header .mobile-nav { display: none; background-color: #ffffff; border-top: 1px solid #e0e0e6; padding: 12px 0; }
.site-header .mobile-nav.open { display: block; }
.site-header .mobile-nav .nav-list { list-style: none; display: flex; flex-direction: column; gap: 2px; margin: 0; padding: 0; }
.site-header .mobile-nav .nav-link { color: #444444; font-size: 15px; font-weight: 500; padding: 10px 16px; border-radius: 8px; transition: all 0.2s; display: block; }
.site-header .mobile-nav .nav-link:hover { background-color: #f0f0ff; color: #1F25DB; text-decoration: none; }
.site-header .mobile-nav .nav-link.active { background-color: #ededff; color: #1F25DB; font-weight: 600; }
@media (min-width: 768px) {
  .site-header .header-nav { display: block; }
  .site-header .mobile-menu-toggle { display: none; }
  .site-header .mobile-nav { display: none !important; }
  .site-header .header-logo { font-size: 20px; }
}
@media (min-width: 1024px) {
  .site-header { padding: 14px 0; }
  .site-header .header-logo { font-size: 22px; }
  .site-header .header-nav .nav-link { font-size: 15px; padding: 8px 16px; }
}