/* ==========================================================================
   ZECONEX — RESPONSIVE STYLESHEET
   Mobile-First & Breakpoints for 320px, 360px, 390px, 430px, 768px, 1024px, 1440px, 1920px
   ========================================================================== */

/* --------------------------------------------------------------------------
   Mobile Navigation Drawer & Overlay
   -------------------------------------------------------------------------- */
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(16, 28, 44, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.mobile-nav-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  max-width: 86vw;
  background-color: var(--color-bg);
  border-left: 1.5px solid var(--color-grey);
  z-index: 1002;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  box-shadow: -10px 0 35px rgba(16, 28, 44, 0.15);
  overflow-y: auto;
}

.mobile-nav-drawer.is-open {
  transform: translateX(0);
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-grey);
}

.mobile-nav-close {
  background: transparent;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  color: var(--color-text);
  line-height: 1;
  padding: 0.25rem;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  border-radius: var(--radius-btn);
  transition: background-color var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.is-active {
  background-color: #E8F3EE;
  color: var(--color-primary);
}

.mobile-nav-footer {
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-grey);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Laptop / Large Tablet (< 1024px) */
@media (max-width: 1024px) {
  .desktop-nav {
    display: none;
  }

  .header-cta {
    display: none;
  }

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

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .project-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

  .why-steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

/* Tablet (< 768px) */
@media (max-width: 768px) {
  :root {
    --header-height: 70px;
  }

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

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

  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .project-cta-row {
    flex-direction: column;
    align-items: stretch;
  }

  .project-cta-row .btn {
    width: 100%;
  }

  .partnership-buttons {
    flex-direction: column;
    align-items: stretch;
  }

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

  .tabs-nav {
    flex-direction: column;
  }

  .tab-btn {
    width: 100%;
    text-align: center;
  }

  .whatsapp-floating {
    bottom: max(1.25rem, env(safe-area-inset-bottom, 1.25rem));
    right: 1.25rem;
  }

  .whatsapp-tooltip {
    display: none; /* Hide hover tooltip on touch devices */
  }
}

/* Mobile Screens (< 480px / 430px / 390px / 360px / 320px) */
@media (max-width: 480px) {
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .why-steps-grid {
    grid-template-columns: 1fr;
  }

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

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

  .stat-card {
    padding: 1.5rem 1rem;
  }

  .card {
    padding: 1.25rem;
  }

  .form-box-card {
    padding: 1.5rem 1rem;
  }

  .partnership-panel {
    padding: 2rem 1.25rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .lightbox-dialog {
    padding: 1.25rem;
  }

  /* Mobile Button and Action Stacking */
  .system-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  /* Mobile Tables & Containers Safe Scroll */
  .table-responsive,
  .legal-table-responsive {
    -webkit-overflow-scrolling: touch;
    width: 100%;
  }

  /* Monospace Form Inputs Safe Width on Narrow Viewports (<=375px) */
  input[type="text"],
  input[type="email"],
  input[type="tel"],
  input[type="number"],
  select,
  textarea {
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
    font-size: 16px; /* Prevents iOS auto-zoom on input focus */
  }
}

/* Extra-Narrow Mobile Screens (<= 375px — e.g. iPhone SE / mini) */
@media (max-width: 375px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  h1 {
    font-size: 1.95rem;
  }

  h2 {
    font-size: 1.55rem;
  }

  .btn {
    padding: 0.75rem 1.25rem;
    font-size: 0.88rem;
    width: 100%;
  }

  .btn-sm {
    padding: 0.6rem 1rem;
  }

  .stat-card-number {
    font-size: 2.2rem;
  }
}

/* Ultrawide screens (> 1440px / 1920px) */
@media (min-width: 1600px) {
  :root {
    --container-max: 1360px;
  }

  .hero-description {
    max-width: 620px;
    font-size: 1.2rem;
  }
}