html,
body {
  max-width: 100%;
  overflow-x: hidden;
}

@media (max-width: 900px) {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .header-content {
    min-height: 72px;
    gap: 16px;
  }

  .brand {
    width: 170px;
    flex-shrink: 0;
  }

  .desktop-nav,
  .header-cta {
    display: none !important;
  }

  .mobile-menu-toggle {
    display: inline-flex;
    flex-shrink: 0;
  }

  .mobile-nav {
    display: none;
    background: var(--color-offwhite);
    border-top: 1px solid rgba(45, 45, 45, 0.08);
    padding: 20px 24px 24px;
  }

  .mobile-nav.is-open {
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .mobile-nav a {
    padding: 12px 0;
    border-bottom: 1px solid rgba(45, 45, 45, 0.08);
  }

  .mobile-nav .btn {
    width: 100%;
    margin-top: 8px;
  }

  .hero {
    min-height: auto;
    padding: 56px 0 96px;
  }

  .hero-grid,
  .section-grid,
  .structure-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .cards-grid,
  .steps-grid,
  .stats-grid,
  .projects-grid,
  .portfolio-grid,
  .process-grid,
  .footer-grid {
    grid-template-columns: 1fr !important;
    width: 100%;
  }

  .step-card,
  .process-card,
  .portfolio-card,
  .project-card,
  .info-card,
  .stat-card,
  .contact-card {
    width: 100%;
    min-width: 0;
  }

  .process-card-wide {
    grid-column: span 1;
  }

  .hero-card {
    min-height: 320px;
    padding: 28px;
  }

  .structure-visual,
  .image-placeholder {
    min-height: 360px;
  }

  .hero-actions {
    width: 100%;
    flex-direction: column;
  }

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

  .footer-bottom {
    flex-direction: column;
  }

  .contact-card {
    padding: 32px 24px;
  }

  .contact-form .btn {
    width: 100%;
  }

  .section-divider {
    margin-bottom: 40px;
  }

  .whatsapp-float {
    width: 58px;
    height: 58px;
    min-height: 58px;
    max-width: 58px;
    right: 18px;
    left: auto;
    bottom: 18px;
    padding: 0;
    border-radius: 999px;
    font-size: 0;
  }

  .whatsapp-float::before {
    content: "☎";
    font-size: 1.45rem;
    line-height: 1;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(100% - 24px, var(--container));
  }

  .brand {
    width: 150px;
  }

  .section,
  .stats-section {
    padding: 72px 0;
  }

  .page-hero {
    padding: 84px 0 64px;
  }

  .final-cta-box,
  .contact-card,
  .info-card,
  .stat-card,
  .process-card,
  .step-card {
    padding: 28px 22px;
  }
}