@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .section-title { font-size: 1.6rem; }
  .btn { padding: 12px 24px; font-size: 0.82rem; }
  .timeline { padding-left: 24px; }
  .timeline-marker { left: -20px; width: 10px; height: 10px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .section-title { font-size: 1.6rem; }
}