/* Responsive */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 900px) {
  .desktop-nav { display: none; }
  .hamburger { display: block; }
  .header-cta .btn-member { display: none; }
  .header-cta .btn-donate { padding: 8px 14px; font-size: 12px; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .two-col { grid-template-columns: 1fr; }
  .donation-cta .grid-2 { grid-template-columns: 1fr; }
  .rds-topbar { display: none; }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
  .logo-text small { display: none; }
  .logo-text strong { font-size: 16px; }
  .rds-logo img { width: 46px; height: 46px; }
  .hero-content h1 { font-size: 2rem; }
  .stat-item .num { font-size: 2.2rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom .container { flex-direction: column; text-align: center; }
}