/* ==========================================================================
   SECTION: Frequently Bought Together (FBT)
   Visual Combo Formula (CellphoneS/TGDD Standard)
   Compliant with 100% Zero Magic Numbers & Design Tokens
   ========================================================================== */

frequently-bought-together {
  display: block;
  width: 100%;
  margin: 0;
}

.fbt-box {
  background-color: transparent;
  border: none;
  border-radius: 0;
  padding: var(--space-4) 0 var(--space-6);
  box-shadow: none;
}

/* --------------------------------------------------------------------------
   1. Header: Unified Title Row with inline Discount Badge
   -------------------------------------------------------------------------- */
.fbt-header {
  margin-bottom: var(--space-5);
  border: none;
  padding-bottom: var(--space-0);
}

.fbt-header__title-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.fbt-title {
  margin: var(--space-0);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: rgb(var(--color-foreground));
  line-height: var(--line-height-tight);
}

.fbt-discount-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background-color: rgba(var(--color-foreground), var(--opacity-5));
  color: rgb(var(--color-foreground));
  border: var(--border-1) solid rgba(var(--color-foreground), var(--opacity-10));
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-none);
  white-space: nowrap;
}


/* --------------------------------------------------------------------------
   2. Formula Row: Track, Cards, Operators, Discount Box
   -------------------------------------------------------------------------- */
.fbt-formula {
  --fbt-media-size: 6.75rem;
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x mandatory;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  scrollbar-width: none;
}

.fbt-formula::-webkit-scrollbar {
  display: none;
}

.fbt-formula__track {
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  gap: var(--space-2);
  min-width: max-content;
}

@media screen and (min-width: 750px) {
  .fbt-formula {
    --fbt-media-size: calc(var(--space-32) + var(--space-8));
    overflow: visible;
    padding-bottom: var(--space-2);
  }
  .fbt-formula__track {
    min-width: 0;
    width: 100%;
    justify-content: flex-start;
    gap: var(--space-3);
  }
}

/* Card & Column Styling */
.fbt-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  width: var(--fbt-media-size);
  flex-shrink: 0;
  scroll-snap-align: start;
  background-color: transparent;
  border: none;
  transition: opacity var(--duration-200) var(--ease-default),
              filter var(--duration-200) var(--ease-default);
}

@media screen and (min-width: 750px) {
  .fbt-card {
    width: var(--fbt-media-size);
    flex: 0 0 auto;
  }
}

.fbt-card.is-unselected {
  opacity: var(--opacity-40);
  filter: grayscale(1);
}

/* Top Squares: Media Box */
.fbt-card__media {
  width: 100%;
  aspect-ratio: var(--aspect-square);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background-color: rgb(var(--color-background));
  border: none;
  position: relative;
}

.fbt-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  padding: 0;
  transition: transform var(--duration-300) var(--ease-default);
}

.fbt-card:not(.fbt-card--add):hover .fbt-card__img {
  transform: scale(1.05);
}

/* Card: Chọn thêm sản phẩm (fbt-card--add) */
.fbt-card--add {
  cursor: pointer;
}

.fbt-card__media--add {
  border: var(--border-hairline) dashed rgba(var(--color-foreground), var(--opacity-20));
  background-color: rgba(var(--color-foreground), var(--opacity-5));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  transition: all var(--duration-200) var(--ease-default);
}

.fbt-card--add:hover .fbt-card__media--add {
  border-color: rgba(var(--color-foreground), var(--opacity-40));
  background-color: rgba(var(--color-foreground), var(--opacity-10));
  transform: scale(1.02);
}

.fbt-card__add-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--space-5);
  height: var(--space-5);
  color: rgba(var(--color-foreground), var(--opacity-50));
  transition: transform var(--duration-150) var(--ease-default), color var(--duration-150) var(--ease-default);
}

.fbt-card--add:hover .fbt-card__add-icon {
  color: rgb(var(--color-foreground));
  transform: scale(1.1);
}

.fbt-card__add-icon svg {
  width: 100%;
  height: 100%;
}

.fbt-card__add-badge {
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-medium);
  padding: var(--space-0-5) var(--space-2);
  border-radius: var(--radius-full);
  background-color: rgba(var(--color-background), var(--opacity-90));
  backdrop-filter: blur(var(--blur-sm));
  -webkit-backdrop-filter: blur(var(--blur-sm));
  border: var(--border-hairline) solid rgba(var(--color-foreground), var(--opacity-10));
  color: rgba(var(--color-foreground), var(--opacity-75));
  line-height: var(--line-height-none);
  user-select: none;
}

.fbt-card__title--add {
  color: rgba(var(--color-foreground), var(--opacity-80));
  font-weight: var(--font-weight-medium);
}

.fbt-card__add-meta {
  font-size: var(--font-size-2xs);
  color: rgba(var(--color-foreground), var(--opacity-50));
  line-height: var(--line-height-tight);
}

.fbt-pill--add {
  background-color: transparent;
  border: var(--border-1) solid var(--color-border);
  color: rgb(var(--color-foreground));
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-default),
    border-color var(--duration-fast) var(--ease-default),
    color var(--duration-fast) var(--ease-default),
    box-shadow var(--duration-fast) var(--ease-default),
    transform var(--duration-fast) var(--ease-spring);
  will-change: transform;
}

.fbt-card--add:hover .fbt-pill--add,
.fbt-pill--add:hover {
  background-color: var(--color-primary);
  color: var(--color-primary-fg);
  border-color: var(--color-primary);
  transform: translateY(calc(var(--space-0-5) * -0.5)) scale(1.03);
  box-shadow: var(--shadow-xs);
}

.fbt-pill--add:active {
  transform: translateY(0) scale(0.97);
  transition-duration: var(--duration-instant);
}

/* Operators (+ and =) - Dead-Centered to the Top Squares */
.fbt-operator {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--space-4);
  height: var(--space-4);
  margin-top: calc(var(--fbt-media-size) / 2 - var(--space-4) / 2);
  color: rgba(var(--color-foreground), var(--opacity-40));
  background-color: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  flex-shrink: 0;
}

.fbt-operator svg {
  width: var(--space-3-5);
  height: var(--space-3-5);
}

@media screen and (max-width: 749px) {
  .fbt-operator {
    width: var(--space-3-5);
    height: var(--space-3-5);
    margin-top: calc(var(--fbt-media-size) / 2 - var(--space-3-5) / 2);
  }
  .fbt-operator svg {
    width: var(--space-3);
    height: var(--space-3);
  }
}


/* Info Details Row (Equalized Heights) */
.fbt-card__info {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  padding-top: var(--space-2-5);
  gap: var(--space-1-5);
}

.fbt-card__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: rgb(var(--color-foreground));
  text-decoration: none;
  line-height: var(--line-height-snug);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: calc(var(--font-size-xs) * var(--line-height-snug) * 2);
  text-align: center;
  width: 100%;
  text-wrap: balance;
}

.fbt-card__title:hover {
  color: var(--color-primary);
}

.fbt-card__prices {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-height: var(--space-7);
}

.fbt-card__prices .price {
  font-size: var(--font-size-xs);
  line-height: var(--line-height-tight);
}

.fbt-card__prices .price-item--sale,
.fbt-card__prices .price-item--regular {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.fbt-card__prices .price__sale s.price-item--regular {
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-normal);
  color: rgba(var(--color-foreground), var(--opacity-50));
}

/* Card Selection Controls */
.fbt-card__action {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--space-7);
  width: 100%;
}

.fbt-card__swap-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2-5);
  border-radius: var(--radius-full);
  background-color: transparent;
  border: var(--border-hairline) solid rgba(var(--color-foreground), var(--opacity-20));
  color: rgba(var(--color-foreground), var(--opacity-80));
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-default);
  white-space: nowrap;
  line-height: var(--line-height-none);
}

.fbt-card__swap-btn:hover {
  background-color: rgba(var(--color-foreground), var(--opacity-5));
  border-color: rgba(var(--color-foreground), var(--opacity-40));
  color: rgb(var(--color-foreground));
}

.fbt-card__swap-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--space-3);
  height: var(--space-3);
  flex-shrink: 0;
}

.fbt-card__swap-icon svg {
  width: 100%;
  height: 100%;
}

/* --------------------------------------------------------------------------
   Modal: Chọn sản phẩm mua kèm (Tích hợp Singleton #ThemeModal)
   -------------------------------------------------------------------------- */
.popup-modal.fbt-theme-modal .popup-modal__content {
  max-width: var(--max-w-md);
  padding: var(--space-0);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-surface, rgb(var(--color-background)));
}

.popup-modal.fbt-theme-modal .popup-modal__content-info {
  padding: var(--space-0);
}

.popup-modal.fbt-theme-modal .popup-modal__toggle {
  top: var(--space-2-5);
  right: var(--space-3);
  z-index: var(--z-10);
}

.fbt-modal-dialog {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
}

.fbt-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-12) var(--space-3) var(--space-4);
  border-bottom: var(--border-hairline) solid var(--color-border);
  background-color: var(--color-surface, rgb(var(--color-background)));
}

.fbt-modal__header-title-wrap {
  display: flex;
  flex-direction: column;
  gap: var(--space-0-5);
}

.fbt-modal__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  margin: var(--space-0);
  color: rgb(var(--color-foreground));
  line-height: var(--line-height-tight);
}

.fbt-modal__subtitle {
  font-size: var(--font-size-2xs);
  color: rgba(var(--color-foreground), var(--opacity-60));
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-tight);
}

.fbt-modal__body {
  padding: var(--space-3) var(--space-4);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: calc(80vh - var(--space-16));
}

.fbt-modal-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2-5);
  border-radius: var(--radius-md);
  border: var(--border-hairline) solid var(--color-border);
  background-color: transparent;
  cursor: pointer;
  transition: all var(--duration-150) var(--ease-default);
  user-select: none;
}

.fbt-modal-item:hover {
  background-color: rgba(var(--color-foreground), var(--opacity-5));
  border-color: rgba(var(--color-foreground), var(--opacity-20));
}

.fbt-modal-item.is-selected {
  border-color: var(--color-primary);
  background-color: rgba(var(--color-foreground), var(--opacity-5));
}

.fbt-modal-item.is-disabled {
  opacity: var(--opacity-40);
  pointer-events: none;
}

.fbt-modal-item__checkbox-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.fbt-modal-item__custom-box {
  width: var(--space-5);
  height: var(--space-5);
  border-radius: var(--radius-sm);
  border: var(--border-hairline) solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgb(var(--color-background));
  color: transparent;
  transition: all var(--duration-150) var(--ease-default);
}

.fbt-modal-item__custom-box svg {
  width: var(--space-3);
  height: var(--space-3);
}

.fbt-modal-item.is-selected .fbt-modal-item__custom-box {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-fg);
}

.fbt-modal-item__media {
  width: var(--space-12);
  height: var(--space-12);
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background-color: rgba(var(--color-foreground), var(--opacity-5));
}

.fbt-modal-item__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.fbt-modal-item__info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-0-5);
}

.fbt-modal-item__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: rgb(var(--color-foreground));
  line-height: var(--line-height-snug);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.fbt-modal-item__prices {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}

.fbt-modal-item__price {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.fbt-modal-item__compare-price {
  font-size: var(--font-size-2xs);
  color: rgba(var(--color-foreground), var(--opacity-50));
  text-decoration: line-through;
}

.fbt-modal-item__action {
  flex-shrink: 0;
}

.fbt-modal-item__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-medium);
  border: var(--border-hairline) solid var(--color-border);
  background-color: transparent;
  color: rgba(var(--color-foreground), var(--opacity-70));
  transition: all var(--duration-150) var(--ease-default);
  white-space: nowrap;
  line-height: var(--line-height-none);
}

.fbt-modal-item.is-selected .fbt-modal-item__badge {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-fg);
}

/* Modal Footer */
.fbt-modal__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-top: var(--border-hairline) solid var(--color-border);
  background-color: rgba(var(--color-background), var(--opacity-95));
}

.fbt-modal__footer-text {
  font-size: var(--font-size-xs);
  color: rgba(var(--color-foreground), var(--opacity-70));
  font-weight: var(--font-weight-medium);
}

.fbt-modal__apply-btn {
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border: var(--border-hairline) solid var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-primary-fg);
  cursor: pointer;
  transition: opacity var(--duration-150) var(--ease-default);
  line-height: var(--line-height-tight);
}

.fbt-modal__apply-btn:hover {
  opacity: var(--opacity-hover);
}

/* --------------------------------------------------------------------------
   3. Footer Summary: Pricing, Add Button, Note
   -------------------------------------------------------------------------- */
.fbt-footer {
  border-top: var(--border-hairline) solid rgba(var(--color-foreground), var(--opacity-10));
  padding-top: var(--space-4);
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.fbt-footer__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

@media screen and (max-width: 749px) {
  .fbt-footer__row {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }
}

.fbt-footer__pricing {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.fbt-footer__total-wrap,
.fbt-footer__savings-wrap {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}

.fbt-footer__label {
  font-size: var(--font-size-sm);
  color: rgba(var(--color-foreground), var(--opacity-75));
}

.fbt-footer__total-price {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.fbt-footer__savings-wrap {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}

.fbt-footer__savings-price {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  font-variant-numeric: tabular-nums;
}

.fbt-buy-btn,
.button.fbt-buy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  border: var(--border-1) solid var(--color-primary);
  background-color: transparent;
  color: var(--color-primary);
  border-radius: var(--radius-control);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  min-height: var(--control-height);
  box-shadow: none;
  transition: all var(--duration-fast) var(--ease-default);
}

.fbt-buy-btn:hover,
.button.fbt-buy-btn:hover {
  background-color: var(--color-primary);
  color: var(--color-primary-fg);
  border-color: var(--color-primary);
  transform: translateY(calc(var(--space-0-5) * -0.5));
  box-shadow: var(--shadow-sm);
}

.fbt-buy-btn:active,
.button.fbt-buy-btn:active {
  transform: translateY(0) scale(0.98);
}

.fbt-buy-btn:disabled,
.button.fbt-buy-btn:disabled {
  opacity: var(--opacity-50);
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
  box-shadow: none;
}

@media screen and (max-width: 749px) {
  .fbt-buy-btn {
    width: 100%;
  }
}

.fbt-note {
  display: flex;
  align-items: center;
  gap: var(--space-1-5);
  padding: var(--space-1) 0 0;
  background-color: transparent;
  border: none;
  border-radius: 0;
  font-size: var(--font-size-2xs);
  color: rgba(var(--color-foreground), var(--opacity-60));
}

.fbt-note__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--space-3-5);
  height: var(--space-3-5);
  color: rgba(var(--color-foreground), var(--opacity-40));
  flex-shrink: 0;
}

.fbt-note__icon svg {
  width: 100%;
  height: 100%;
}

.fbt-spinner {
  display: none;
  width: var(--space-4);
  height: var(--space-4);
  border-radius: var(--radius-full);
  border: var(--border-hairline) solid rgba(var(--color-primary), var(--opacity-20));
  border-top-color: currentColor;
  animation: rotator var(--duration-700) var(--ease-linear) infinite;
}

frequently-bought-together.is-submitting .fbt-spinner {
  display: inline-block;
}

frequently-bought-together.is-submitting .fbt-buy-btn {
  pointer-events: none;
  opacity: var(--opacity-75);
}

/* --------------------------------------------------------------------------
   4. Block Placement Variant (.fbt-box--block)
   Adaptation for Product Info sidebar and Product Details Tabs/Accordions
   -------------------------------------------------------------------------- */
.fbt-box--block {
  padding-top: var(--space-2);
  padding-bottom: var(--space-4);
  padding-left: 0;
  padding-right: 0;
}

/* Specific to product info container (narrow sidebar column) */
.product__info-container .fbt-box--block {
  border: none;
  background-color: rgba(var(--color-foreground), 0.03);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-top: var(--space-4);
  margin-bottom: var(--space-4);
}

.fbt-box--block .fbt-footer {
  border-top: var(--border-hairline) solid rgba(var(--color-foreground), var(--opacity-10));
  padding-top: var(--space-3);
}

.product__info-container .fbt-box--block .fbt-header {
  margin-bottom: var(--space-3);
}

.product__info-container .fbt-box--block .fbt-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

.product__info-container .fbt-box--block .fbt-formula {
  --fbt-media-size: calc(var(--space-24) + var(--space-3));
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
  overflow-x: auto;
}

.product__info-container .fbt-box--block .fbt-formula__track {
  gap: var(--space-2);
  min-width: max-content;
}

@media screen and (min-width: 750px) {
  .product__info-container .fbt-box--block .fbt-formula {
    --fbt-media-size: calc(var(--space-24) + var(--space-3));
    overflow-x: auto;
  }
  .product__info-container .fbt-box--block .fbt-formula__track {
    min-width: max-content;
    width: auto;
  }
}

.product__info-container .fbt-box--block .fbt-footer {
  padding-top: var(--space-3);
  margin-top: var(--space-3);
  gap: var(--space-2-5);
}

.product__info-container .fbt-box--block .fbt-footer__row {
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-2-5);
}

.product__info-container .fbt-box--block .fbt-footer__pricing {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
}

.product__info-container .fbt-box--block .fbt-footer__total-price {
  font-size: var(--font-size-lg);
}

.product__info-container .fbt-box--block .fbt-buy-btn {
  width: 100%;
}