@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .contact {
    grid-template-columns: 1fr;
  }

  .calc-container {
    grid-template-columns: 1fr;
  }

  .calc-results {
    position: static;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
    --container-padding: 16px;
  }

  .section {
    padding: 60px 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--surface);
    flex-direction: column;
    padding: 80px 24px 24px;
    box-shadow: var(--shadow-lg);
    transition: right 0.3s ease;
    z-index: 1000;
    align-items: stretch;
  }

  .nav.open {
    right: 0;
  }

  .nav a {
    padding: 14px 16px;
    font-size: 1rem;
  }

  .nav-cta {
    text-align: center;
    margin-top: 16px;
  }

  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
  }

  .nav-overlay.open {
    display: block;
  }

  .hero {
    min-height: 70vh;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    width: 100%;
  }

  .portfolio-grid {
    grid-template-columns: 1fr;
  }

  .courses-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-features {
    grid-template-columns: 1fr;
  }

  .calc-fields {
    grid-template-columns: 1fr;
  }

  .calc-tabs {
    flex-direction: column;
    align-items: stretch;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero {
    min-height: 60vh;
  }

  .hero-content {
    padding: 20px 0;
  }

  .hero h1 {
    font-size: 1.7rem;
  }

  .hero p {
    font-size: 0.95rem;
  }

  .section {
    padding: 48px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .portfolio-categories {
    flex-direction: column;
    align-items: stretch;
  }

  .portfolio-filter {
    text-align: center;
  }

  .calc-result-price {
    font-size: 2rem;
  }

  .footer-social {
    justify-content: center;
  }

  .whatsapp-float {
    width: 52px;
    height: 52px;
    bottom: 16px;
    right: 16px;
  }

  .whatsapp-float svg {
    width: 26px;
    height: 26px;
  }

  .back-to-top {
    bottom: 84px;
    right: 16px;
    width: 42px;
    height: 42px;
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
  }
}