/**
 * DuplexDot DIGITAL AGENCY — RESPONSIVE DESIGN SYSTEM
 * Responsive breakpoints: Large Desktop (1440px+), Desktop (1200px), Tablet (768px-1199px), Mobile (<768px).
 */

/* ==========================================================================
   1. LARGE DESKTOP (1440px and up)
   ========================================================================== */
@media (min-width: 1440px) {
  :root {
    --container-max-width: 1320px;
  }

  .display-title {
    font-size: 4.5rem;
  }
}

/* ==========================================================================
   2. DESKTOP & LAPTOP (1024px to 1200px)
   ========================================================================== */
@media (max-width: 1199px) {
  .stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  
  .split-layout {
    gap: var(--space-2xl);
  }

  .footer-top {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: var(--space-2xl);
  }
}

/* ==========================================================================
   3. TABLET LANDSCAPE & PORTRAIT (768px to 1023px)
   ========================================================================== */
@media (max-width: 1023px) {
  .desktop-nav,
  .header-actions .btn-secondary {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .problem-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .problem-grid > .problem-card:last-child {
    grid-column: span 2;
  }

  .process-steps-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .content-visual-layout,
  .content-visual-layout.reversed {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .service-editorial-row,
  .service-editorial-row.reverse {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .service-editorial-row.reverse .service-info-col {
    order: 1;
  }

  .service-editorial-row.reverse .service-visual-col {
    order: 2;
  }

  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2xl);
  }
}

/* ==========================================================================
   4. MOBILE DEVICES (Below 768px)
   ========================================================================== */
@media (max-width: 767px) {
  :root {
    --section-spacing-y: 3.75rem;
    --section-spacing-sm: 2.5rem;
    --container-padding: 1.25rem;
  }

  .grid-4,
  .grid-3,
  .grid-2,
  .problem-grid,
  .process-steps-grid,
  .split-layout {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .problem-grid > .problem-card:last-child {
    grid-column: span 1;
  }

  .system-flow-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .system-flow-arrow {
    transform: rotate(90deg);
    align-self: center;
    margin: 4px 0;
  }

  .cost-flow-container {
    flex-direction: column;
    align-items: flex-start;
  }

  .cost-flow-steps {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
  }

  .cost-flow-arrow {
    transform: rotate(90deg);
    align-self: center;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-md);
  }

  .stats-grid > .stat-item:last-child {
    grid-column: span 2;
  }

  .heading-group {
    margin-bottom: var(--space-2xl);
  }

  .btn {
    width: 100%;
    min-height: 48px; /* Touch-friendly accessible tap target */
  }

  .header-actions .btn {
    width: auto;
  }

  .cta-banner {
    padding: var(--space-2xl) var(--space-md);
  }

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

  .cta-banner-actions .btn {
    width: 100%;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .footer-legal-links {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .filter-tabs {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--space-sm);
    -webkit-overflow-scrolling: touch;
  }

  .filter-btn {
    flex-shrink: 0;
  }
}

/* Small mobile devices (<400px) */
@media (max-width: 399px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid > .stat-item:last-child {
    grid-column: span 1;
  }

  .brand-logo-subtitle {
    display: none;
  }
}