/* ==========================================================================
   RESPONSIVE LAYOUT & MEDIA QUERIES
   Breakpoints: sm (640px), md (768px), lg (1024px), xl (1280px)
   ========================================================================== */

/* Mobile Hamburger Toggle Button */
.navbar-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
}

/* Tablet & Mobile Screens (<= 1024px) */
@media (max-width: 1024px) {
  .dashboard-layout {
    flex-direction: column;
  }

  .dashboard-sidebar {
    width: 100%;
  }

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

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

/* Mobile Screens (<= 768px) */
@media (max-width: 768px) {
  :root {
    --navbar-height: 3.75rem;
  }

  .navbar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
  }

  .navbar-nav {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-6);
    gap: var(--space-4);
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: var(--z-dropdown);
  }

  .navbar-nav.active {
    display: flex;
  }

  .navbar-nav .nav-link {
    font-size: var(--font-size-base);
    padding: var(--space-2) 0;
    width: 100%;
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  /* Responsive Table presentation */
  .table-responsive {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Touch Targets: minimum 44px for primary interactions */
  .btn, .nav-link, .page-link {
    min-height: 44px;
  }
}

/* Small Handset Screens (<= 480px) */
@media (max-width: 480px) {
  .container {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }

  .card {
    padding: var(--space-4);
  }

  .modal-container {
    padding: var(--space-4);
  }
}