/* ==========================================================================
   Swapno Importer - Mobile-First Responsive Breakpoints & Viewport Engine
   Viewport targets: 320px, 360px, 375px, 390px, 414px, 480px, 768px, 1024px, 1280px, 1440px
   Zero Horizontal Overflow | 44px Touch Targets | Responsive Drawers
   ========================================================================== */

/* Mobile Off-Canvas Navigation Drawer */
.mobile-drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.mobile-drawer-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 85%;
  max-width: 320px;
  background: var(--surface);
  z-index: 2001;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow-y: auto;
}

.mobile-drawer.active {
  transform: translateX(0);
}

.drawer-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.drawer-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--dark);
  cursor: pointer;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.drawer-links {
  list-style: none;
  padding: 1rem 0;
}

.drawer-link {
  display: flex;
  align-items: center;
  padding: 0.85rem 1.5rem;
  font-weight: 600;
  color: var(--dark);
  font-size: 1rem;
  min-height: 44px;
  border-bottom: 1px solid var(--border-light);
}

.drawer-link:hover, .drawer-link.active {
  background: var(--light-bg);
  color: var(--primary);
}

/* Sticky Bottom Action Bar on Mobile Product Detail */
.mobile-sticky-action-bar {
  display: none;
}

/* Responsive Table Container */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 1rem;
}

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

/* Large Tablets & Small Laptops (<= 1024px) */
@media (max-width: 1024px) {
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

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

/* Tablets (<= 768px) */
@media (max-width: 768px) {
  .top-bar-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    display: none; /* Hidden, accessible via mobile drawer */
  }

  .mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .header-search {
    order: 3;
    max-width: 100%;
    width: 100%;
    margin-top: 0.5rem;
  }

  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 0.75rem 0;
  }

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

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  /* Catalog Layout (Sidebar converts to filter button) */
  .catalog-layout {
    flex-direction: column;
  }

  .catalog-sidebar {
    display: none; /* Opened via Filter Drawer */
  }

  .catalog-sidebar.drawer-mode {
    display: block;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    top: 20%;
    background: #FFF;
    z-index: 2100;
    border-radius: 16px 16px 0 0;
    box-shadow: 0 -10px 25px rgba(0, 0, 0, 0.2);
    overflow-y: auto;
    padding: 1.5rem;
    transform: translateY(100%);
    transition: transform 0.3s ease;
  }

  .catalog-sidebar.drawer-mode.active {
    transform: translateY(0);
  }

  .mobile-filter-trigger {
    display: inline-flex !important;
  }

  /* Checkout Layout Stack */
  .checkout-grid {
    grid-template-columns: 1fr !important;
  }

  .order-summary-card {
    order: -1; /* Show order summary on top */
  }

  /* Product Details Layout Stack */
  .product-detail-layout {
    grid-template-columns: 1fr !important;
  }

  /* Sticky Bottom Action Bar for Mobile Product Page */
  .mobile-sticky-action-bar {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #FFF;
    border-top: 1px solid var(--border);
    padding: 0.75rem 1rem;
    z-index: 999;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.08);
  }

  body.has-sticky-bar {
    padding-bottom: 70px;
  }
}

/* Small Screens & Mobile Phones (<= 480px) */
@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .product-body {
    padding: 0.75rem;
  }

  .product-title {
    font-size: 0.875rem;
    height: 2.4rem;
  }

  .price-main {
    font-size: 1.05rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  /* Responsive Form controls */
  .form-control {
    font-size: 16px; /* Prevents auto-zoom on iOS */
  }

  .btn-lg {
    padding: 0.75rem 1.25rem;
    font-size: 0.95rem;
  }
}

/* Very Small Viewports (320px - 360px: e.g. iPhone SE 1st Gen) */
@media (max-width: 360px) {
  html {
    font-size: 14px;
  }

  .product-grid {
    grid-template-columns: 1fr; /* Single column for ultra-small screens */
  }

  .logo-title {
    font-size: 1.1rem;
  }

  .logo-badge {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }
}