@media (max-width: 991px) {
  .hero-logo {
    display: none;
  }

  .hero-section {
    padding-top: 40px;
  }

  .case-card img {
    height: 180px;
  }
}

@media (max-width: 639px) {
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
  }

  .page-wrapper {
    padding-top: 60px;
  }

  .section {
    padding: 16px 0;
  }
  
  .section-header {
    margin-bottom: 16px;
  }
}