/* ==========================================================================
   KDK VIETNAM — 5. RESPONSIVE MODULE (Breakpoints, Mobile Nav Drawer, Overflows)
   ========================================================================== */

/* Default: hide mobile-only elements on desktop */
.mobile-hotline-btn,
.mobile-bottom-bar {
  display: none !important;
}

/* Button group: flex row on desktop, stack on mobile */
.btn-group-mobile {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

/* Laptop & Large Screens */
@media (max-width: 1200px) {
  .container { max-width: 1000px; }
  .grid4 { grid-template-columns: repeat(3, 1fr); }
}

/* Tablet Screens (Max Width 992px) */
@media (max-width: 992px) {
  .container { max-width: 750px; }
  .grid4 { grid-template-columns: repeat(2, 1fr); }
  .grid3 { grid-template-columns: repeat(2, 1fr); }
  .grid2 { grid-template-columns: 1fr; }
  .product-detail-layout { grid-template-columns: 1fr; }

  /* Footer Responsive Stack */
  .footer-top-grid {
    grid-template-columns: 1fr !important;
    gap: 36px !important;
  }

  /* Mobile Header Navigation Drawer */
  .nav-toggle {
    display: flex !important;
    width: 34px !important;
    height: 24px !important;
  }

  .nav-backdrop {
    display: block !important;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1045;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s ease, visibility 0.35s ease;
  }

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

  .nav-menu {
    position: fixed !important;
    top: 0 !important;
    right: -100% !important;
    width: min(85vw, 320px) !important;
    height: 100vh !important;
    background: #0b0f19 !important;
    flex-direction: column !important;
    align-items: flex-start !important;
    padding: 60px 26px 40px !important;
    gap: 12px !important;
    box-shadow: -10px 0 35px rgba(0,0,0,0.6) !important;
    transition: right 0.35s cubic-bezier(0.16, 1, 0.3, 1) !important;
    z-index: 1050 !important;
    overflow-y: auto !important;
  }

  .nav-menu.active {
    right: 0 !important;
  }

  /* Minimal Close Button at Top-Right of Drawer */
  .nav-close-btn {
    position: absolute !important;
    top: 18px !important;
    right: 20px !important;
    background: transparent !important;
    border: none !important;
    color: rgba(255, 255, 255, 0.75) !important;
    font-size: 24px !important;
    cursor: pointer !important;
    width: 36px !important;
    height: 36px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 0 !important;
    transition: all 0.2s ease !important;
  }

  .nav-close-btn:active,
  .nav-close-btn:hover {
    color: var(--primary) !important;
    transform: scale(1.1) !important;
  }

  .nav-menu .nav-item {
    width: 100% !important;
  }

  .nav-menu .nav-link {
    color: var(--white) !important;
    font-size: 16px !important;
    font-weight: 600 !important;
    width: 100% !important;
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    padding: 10px 0 !important;
    position: relative !important;
  }

  /* Remove annoying red underline / dash floating line on mobile */
  .nav-menu .nav-link::before,
  .nav-menu .nav-link:hover::before,
  .nav-menu .nav-link.active::before,
  .nav-menu .nav-link::after,
  .nav-menu .nav-link:hover::after,
  .nav-menu .nav-link.active::after {
    display: none !important;
    content: none !important;
    transform: scale(0) !important;
    opacity: 0 !important;
  }

  /* Mobile Dropdown Submenu (Clean Indented List, No Extra Borders) */
  .nav-item.dropdown .dropdown-menu {
    display: none !important;
    position: static !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    box-shadow: none !important;
    border: none !important;
    background: transparent !important;
    padding: 2px 0 6px 14px !important;
    margin: 0 !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  .nav-item.dropdown.open .dropdown-menu {
    display: block !important;
  }

  .nav-item.dropdown .nav-arrow {
    transition: transform 0.3s ease !important;
    font-size: 13px !important;
    padding: 4px 6px !important;
    color: rgba(255, 255, 255, 0.6) !important;
  }

  .nav-item.dropdown.open .nav-arrow {
    transform: rotate(180deg) !important;
    color: var(--primary) !important;
  }

  .dropdown-item {
    color: rgba(255,255,255,0.78) !important;
    padding: 8px 0 !important;
    font-size: 14px !important;
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
    border: none !important;
    background: transparent !important;
  }

  .dropdown-item i {
    color: var(--accent-pink) !important;
    font-size: 13px !important;
    width: 16px !important;
    text-align: center !important;
  }

  .dropdown-item:hover,
  .dropdown-item:active {
    color: #ffffff !important;
    background: transparent !important;
  }

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

  /* 2-Column Grid of Category & Project Filter Tabs on Mobile (100% visible, no horizontal swiping needed) */
  .tabs-header,
  .project-filter-tabs {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 8px !important;
    padding: 0 !important;
    margin-bottom: 22px !important;
    width: 100% !important;
    overflow-x: visible !important;
  }

  /* Make the first button "Tất Cả" span full width 2 columns */
  .tabs-header .tab-btn:first-child,
  .project-filter-tabs .project-filter-btn:first-child {
    grid-column: span 2 !important;
    font-weight: 800 !important;
    font-size: 13.5px !important;
  }

  .tab-btn,
  .project-filter-btn {
    width: 100% !important;
    text-align: center !important;
    padding: 10px 8px !important;
    font-size: 12.5px !important;
    font-weight: 600 !important;
    line-height: 1.35 !important;
    white-space: normal !important;
    word-break: break-word !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    min-height: 44px !important;
    border-radius: 12px !important;
    box-sizing: border-box !important;
  }

  /* Compact, user-friendly mobile search & sort toolbar */
  .catalog-toolbar {
    display: flex !important;
    flex-direction: column !important;
    align-items: stretch !important;
    padding: 14px 16px !important;
    margin-bottom: 16px !important;
    gap: 12px !important;
    background: var(--bg-light) !important;
    border-radius: var(--radius-lg) !important;
    border: 1px solid var(--border-light) !important;
  }

  .search-box-wrap {
    width: 100% !important;
    position: relative !important;
  }

  .search-box-wrap input {
    width: 100% !important;
    padding: 11px 16px 11px 42px !important;
    font-size: 13.5px !important;
    border-radius: 8px !important;
    box-sizing: border-box !important;
  }

  .search-box-wrap .search-icon {
    position: absolute !important;
    left: 14px !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    font-size: 14px !important;
  }

  .sort-box-wrap {
    width: 100% !important;
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    gap: 10px !important;
    font-size: 13px !important;
  }

  .sort-box-wrap label {
    font-weight: 600 !important;
    color: var(--text-dark) !important;
    white-space: nowrap !important;
  }

  .sort-box-wrap select {
    flex: 1 !important;
    padding: 9px 14px !important;
    font-size: 13px !important;
    border-radius: 8px !important;
    background: #ffffff !important;
    border: 1px solid var(--border-light) !important;
  }

  /* Hide Top Bar on mobile for ultra-clean, compact header */
  .top-bar {
    display: none !important;
  }

  /* Safe area for mobile fixed bottom bar */
  body {
    padding-bottom: 64px !important;
  }

  /* MOBILE FIXED BOTTOM QUICK ACTION BAR */
  .mobile-bottom-bar {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr);
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 99999;
    background: rgba(11, 15, 25, 0.96);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 -4px 25px rgba(0, 0, 0, 0.5);
    padding: 7px 6px calc(7px + env(safe-area-inset-bottom, 0px));
  }

  .mb-bar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    text-decoration: none;
    color: rgba(255, 255, 255, 0.82);
    padding: 4px 6px;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
  }

  .mb-bar-item:active,
  .mb-bar-item:hover {
    color: #ffffff;
  }

  .mb-bar-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13.5px;
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
    transition: all 0.25s ease;
  }

  .mb-bar-hotline .mb-bar-icon {
    background: var(--grad-primary);
    color: #ffffff;
    box-shadow: 0 2px 10px var(--primary-glow);
    animation: mbPulse 2s infinite;
  }

  .mb-bar-address .mb-bar-icon {
    background: rgba(237, 27, 36, 0.15);
    color: #ff6b72;
    border: 1px solid rgba(237, 27, 36, 0.3);
  }

  .mb-bar-email .mb-bar-icon {
    background: rgba(56, 189, 248, 0.15);
    color: #38bdf8;
    border: 1px solid rgba(56, 189, 248, 0.3);
  }

  .mb-bar-label {
    font-size: 11px;
    font-weight: 700;
    line-height: 1.2;
    text-transform: capitalize;
    letter-spacing: 0.2px;
  }

  @keyframes mbPulse {
    0%, 100% { transform: scale(1); box-shadow: 0 2px 10px var(--primary-glow); }
    50% { transform: scale(1.08); box-shadow: 0 4px 16px rgba(237, 27, 36, 0.6); }
  }

  .mobile-hotline-btn {
    display: inline-flex !important;
    align-items: center;
    gap: 6px;
    background: var(--grad-primary);
    color: var(--white) !important;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 12.5px;
    font-weight: 700;
    box-shadow: 0 3px 8px rgba(237, 27, 36, 0.3);
    text-decoration: none;
    transition: transform 0.2s;
    margin-left: auto;
    margin-right: 15px;
    z-index: 10;
  }

  .mobile-hotline-btn:hover {
    transform: scale(1.05);
  }
}

/* Mobile & Tablet Portrait Screens (Max Width 768px) */
@media (max-width: 768px) {
  html, body {
    overflow-x: hidden !important;
    max-width: 100vw !important;
  }

  .container {
    padding: 0 16px !important;
    width: 100% !important;
    max-width: 100vw !important;
    box-sizing: border-box !important;
  }

  /* Preloader Mobile Optimization */
  .loader-content {
    gap: 18px !important;
    padding: 24px !important;
  }
  .loader-title {
    font-size: 16px !important;
    line-height: 1.4 !important;
  }
  .loader-subtitle {
    font-size: 9.5px !important;
    padding: 5px 16px !important;
    letter-spacing: 0.8px !important;
  }
  .loader-info {
    font-size: 11.5px !important;
    padding-top: 16px !important;
  }
  .loader-contacts {
    flex-direction: column !important;
    align-items: center !important;
    gap: 10px !important;
  }
  .loader-address {
    margin-bottom: 12px !important;
    line-height: 1.5 !important;
  }

  /* === MOBILE BUTTON FIXES ===
     All flex-based button groups (including inline style) stack vertically.
     Large buttons shrink to full width for easy thumb tapping. */
  .btn {
    white-space: nowrap !important;
    text-align: center !important;
    justify-content: center !important;
  }

  .btn-lg {
    font-size: 13px !important;
    padding: 11px 18px !important;
  }

  /* Stack any div that holds 2+ buttons side-by-side */
  div:has(> .btn + .btn),
  div:has(> a.btn + a.btn) {
    flex-direction: column !important;
    width: 100% !important;
    gap: 10px !important;
  }

  div:has(> .btn + .btn) .btn,
  div:has(> a.btn + a.btn) .btn {
    width: 100% !important;
    justify-content: center !important;
  }

  /* Named utility class for manual button group stacking on mobile */
  .btn-group-mobile {
    display: flex !important;
    flex-direction: column !important;
    width: 100% !important;
    gap: 10px !important;
    align-items: stretch !important;
  }

  .btn-group-mobile .btn {
    width: 100% !important;
    justify-content: center !important;
    text-align: center !important;
    box-sizing: border-box !important;
  }

  /* Reduce paddings of large cards on mobile to avoid overflow */
  .card-box, .solution-card {
    padding: 24px 20px !important;
  }

  /* Stack footer certification badges on mobile to prevent wrapping squeeze */
  .footer-badges {
    flex-direction: column !important;
    gap: 8px !important;
    width: 100% !important;
    align-items: center !important;
  }

  .footer-badge {
    width: fit-content !important;
    white-space: nowrap !important;
  }

  .section { padding: 50px 0 !important; }
  
  .grid4, .grid3, .grid2 {
    grid-template-columns: 1fr !important;
    gap: 20px !important;
  }

  .hero {
    padding: 70px 0 50px !important;
  }

  .hero h1 {
    font-size: 26px !important;
  }

  .hero p {
    font-size: 14.5px !important;
  }

  .hero-buttons, .cta-actions {
    flex-direction: column !important;
    width: 100% !important;
  }

  .hero-buttons .btn, .cta-actions .btn {
    width: 100% !important;
  }

  .hero-stats {
    flex-direction: column !important;
    gap: 18px !important;
  }

  .catalog-toolbar {
    flex-direction: column !important;
    align-items: stretch !important;
  }

  .product-actions {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 6px !important;
  }

  .product-actions .btn {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 4px !important;
    font-size: 11.5px !important;
    font-weight: 600 !important;
    padding: 7px 8px !important;
    border-radius: 7px !important;
    white-space: nowrap !important;
  }

  .product-actions .btn i {
    font-size: 10px !important;
    margin: 0 !important;
  }

  .modal-grid {
    grid-template-columns: 1fr !important;
  }

  .modal-card {
    padding: 24px 16px !important;
  }

  .footer-bottom-flex {
    flex-direction: column !important;
    text-align: center;
    gap: 12px !important;
  }
}

@media (max-width: 768px) {
  .cta-consultation-flex {
    flex-direction: column !important;
    text-align: center !important;
  }
  .cta-consultation-text {
    flex-direction: column !important;
    gap: 12px !important;
    text-align: center !important;
  }
  .cta-consultation-text i {
    margin: 0 auto;
  }
  .cta-consultation-actions {
    flex-direction: column !important;
    width: 100% !important;
    gap: 10px !important;
  }
  .cta-consultation-actions .btn {
    width: 100% !important;
    justify-content: center !important;
  }

  /* Product Detail Page Mobile Optimization */
  .dp-layout {
    grid-template-columns: 1fr !important;
  }

  .dp-content,
  .dp-sidebar {
    min-width: 0 !important;
    max-width: 100% !important;
    width: 100% !important;
  }

  .dp-top-card {
    padding: 20px 16px !important;
    gap: 20px !important;
    border-radius: var(--radius-lg) !important;
  }

  .dp-top-card-main {
    display: flex !important;
    flex-direction: column !important;
    gap: 20px !important;
    width: 100% !important;
  }

  .dp-gallery-col,
  .dp-summary-col {
    width: 100% !important;
    max-width: 100% !important;
    padding: 0 !important;
  }

  .dp-main-img-box {
    width: 100% !important;
    min-height: unset !important;
    height: auto !important;
    aspect-ratio: 1 / 1 !important;
    max-height: 380px !important;
    border-radius: var(--radius-md) !important;
  }

  .dp-thumbs-strip {
    margin-top: 10px !important;
    gap: 8px !important;
  }

  .dp-thumb-btn {
    width: 58px !important;
    height: 58px !important;
    border-radius: var(--radius-sm) !important;
  }

  .dp-product-name {
    font-size: 21px !important;
    line-height: 1.35 !important;
    margin-bottom: 12px !important;
  }

  .dp-price-wrap {
    width: 100% !important;
    box-sizing: border-box !important;
    padding: 14px 16px !important;
    margin-bottom: 18px !important;
    border-radius: var(--radius-md) !important;
  }

  .dp-price-call {
    font-size: 14.5px !important;
    flex-wrap: wrap !important;
    gap: 6px !important;
    line-height: 1.4 !important;
  }

  .dp-price-call strong {
    white-space: nowrap !important;
    color: var(--primary) !important;
    font-size: 16.5px !important;
  }

  .dp-top-card-full {
    padding-top: 18px !important;
  }

  .dp-highlights-grid {
    grid-template-columns: 1fr 1fr !important;
    gap: 8px !important;
    margin-bottom: 18px !important;
  }

  .dp-highlight-item {
    padding: 10px 12px !important;
    font-size: 12px !important;
    gap: 8px !important;
    border-radius: var(--radius-sm) !important;
  }

  .dp-cta-group {
    flex-direction: column !important;
    gap: 10px !important;
    width: 100% !important;
  }

  .dp-cta-group .btn {
    width: 100% !important;
    justify-content: center !important;
    padding: 13px 18px !important;
    font-size: 14px !important;
  }

  .dp-share-row {
    flex-wrap: wrap !important;
    gap: 8px !important;
  }

  .dp-tabs-card {
    border-radius: var(--radius-lg) !important;
    margin-bottom: 24px !important;
  }

  .dp-tabs-header {
    display: flex !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    border-bottom: 1px solid var(--border-light) !important;
  }

  .dp-tabs-header::-webkit-scrollbar {
    display: none !important;
  }

  .dp-tab-btn {
    flex-shrink: 0 !important;
    padding: 13px 16px !important;
    font-size: 13px !important;
    white-space: nowrap !important;
  }

  .dp-tab-pane {
    padding: 20px 16px !important;
    font-size: 14px !important;
    line-height: 1.7 !important;
  }

  /* Smooth scrollable related products strip on mobile */
  .dp-related-slider-wrap {
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    padding: 4px 2px 14px !important;
  }

  .dp-related-slider-wrap::-webkit-scrollbar {
    display: none !important;
  }

  .dp-related-slider {
    display: flex !important;
    gap: 14px !important;
    transform: none !important;
    width: max-content !important;
    min-width: unset !important;
    max-width: unset !important;
  }

  .dp-related-slider .product-card {
    width: 240px !important;
    min-width: 240px !important;
    max-width: 240px !important;
    flex: 0 0 240px !important;
    flex-shrink: 0 !important;
    flex-grow: 0 !important;
    box-sizing: border-box !important;
    overflow: hidden !important;
  }

  .dp-related-nav {
    display: none !important;
  }

  .dp-sidebar-card {
    padding: 22px 18px !important;
    border-radius: var(--radius-lg) !important;
  }
}