@media (max-width: 968px) {
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-content { max-width: 100%; }
  .hero p { margin: 0 auto 32px; }
  .hero-ctas { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { margin-top: 40px; }
  .header .logo-text { display: none; }
  .nav { display: none; }
  .hamburger { display: flex; }
  .about-grid { grid-template-columns: 1fr; text-align: center; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  section { padding: 60px 0; }
  .hero { padding: 100px 0 60px; }
  .expertise-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
  .certs-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-content { flex-direction: column; text-align: center; }
  .footer-links { flex-wrap: wrap; justify-content: center; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .about-highlights { justify-content: center; }
}