/* 防止水平溢出 */
.wrapper.products_detail {
  overflow-x: hidden;
}

/* ==============================================
   麵包屑導航
   ============================================== */
.breadcrumb_nav {
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 10px;
}

.breadcrumb_nav .container {
  max-width: 1200px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-grey-500);
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin: 0 8px;
  color: var(--color-grey-400);
}

.breadcrumb li a {
  color: var(--color-grey-600);
  transition: color 0.2s ease;
}

.breadcrumb li a:hover {
  color: var(--color-primary);
}

.breadcrumb li.active {
  color: var(--color-primary);
  font-weight: 500;
}

/* ==============================================
   商品資訊區
   ============================================== */
.product_shop_section {
  padding: 30px 0 50px;
}

.product_shop_section .container {
  max-width: 1200px;
}

.product_shop_layout {
  display: grid;
  grid-template-columns: minmax(0, 600px) 1fr;
  gap: 50px;
  align-items: stretch;
}

/* 左：產品圖片 */
.product_gallery {
  position: sticky;
  top: calc(var(--header-height) + 40px);
  max-width: 600px;
  width: 100%;
}

.product_gallery_main {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 0;
  overflow: hidden;
  margin-bottom: 12px;
  background: var(--color-bg-white);
}

/* 大圖已加入提示 */
.cart_added_overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.55);
  z-index: 3;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.cart_added_overlay.is-show {
  opacity: 1;
}

.cart_added_overlay span {
  color: var(--color-bg-white);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.gallery_main_img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity 0.3s ease;
}

/* product_gallery_main 主圖左右切換鈕 — 純白箭頭 hint，無外框/底色，drop-shadow
   提升白色箭頭在淺色圖上的辨識度，hover 微放大強化點擊回饋 */
.gallery_main_arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: transparent;
  color: var(--color-text-white);
  border: none;
  cursor: pointer;
  z-index: 2;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.55));
  transition: transform 0.2s ease;
}

.gallery_main_arrow svg {
  width: 28px;
  height: 28px;
  display: block;
  stroke-width: 2.5;
}

.gallery_main_prev {
  left: 8px;
}

.gallery_main_next {
  right: 8px;
}

@media (hover: hover) {
  .gallery_main_arrow:hover {
    transform: translateY(-50%) scale(1.15);
  }
}

/* 縮圖列 */
.product_gallery_thumbs {
  display: flex;
  gap: 8px;
  width: 100%;
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.product_gallery_thumbs::-webkit-scrollbar {
  display: none;
}

.gallery_thumb {
  flex: 0 0 auto;
  width: 72px;
  height: 72px;
  padding: 0;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  background: var(--color-grey-50);
  transition: border-color 0.2s ease, opacity 0.2s ease;
  opacity: 0.5;
}

.gallery_thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.gallery_thumb.active {
  border-color: var(--color-primary);
  opacity: 1;
}

.gallery_thumb:hover {
  opacity: 0.85;
}

/* 右：商品資訊 */
.product_info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.product_info_bottom {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: auto;
}

.product_info_title {
  font-size: var(--font-size-h2);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.3;
  margin: 0;
}

.product_info_summary {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-grey-700);
  margin: 0;
}

.product_info_hr {
  border: none;
  border-top: 1px solid var(--color-grey-300);
  margin: 0;
}

.product_info_promo {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-grey-600);
  margin: 0;
  padding-left: 14px;
  border-left: none;
  position: relative;
}

.product_info_promo::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--color-primary);
}

.product_info_promo + .product_info_promo {
  margin-top: -14px;
}

/* 價格 */
.product_info_price {
  display: flex;
  align-items: baseline;
}

.price_original {
  font-size: 1rem;
  color: var(--color-grey-500);
  text-decoration: line-through;
  margin-right: 10px;
}

.price_current {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

/* 規格選擇 */
.product_info_spec {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.spec_label,
.qty_label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.spec_dropdown {
  position: relative;
  width: 100%;
}

.spec_dropdown_toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 12px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font-family-base);
  color: var(--color-text-primary);
  background-color: var(--color-grey-100);
  border: 1.5px solid var(--color-grey-300);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.spec_dropdown_toggle:hover {
  border-color: var(--color-grey-400);
  background-color: var(--color-grey-100);
}

.spec_dropdown.is-open .spec_dropdown_toggle {
  border-color: var(--color-primary);
  background-color: var(--color-bg-white);
}

.spec_dropdown_arrow {
  font-size: 0.7rem;
  color: var(--color-grey-500);
  transition: transform 0.2s ease;
}

.spec_dropdown.is-open .spec_dropdown_arrow {
  transform: rotate(180deg);
}

.spec_dropdown_menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background-color: var(--color-bg-white);
  border: 1.5px solid var(--color-grey-300);
  border-radius: 4px;
  box-shadow: 0 4px 16px var(--color-border);
  list-style: none;
  margin: 0;
  padding: 4px 0;
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all 0.2s ease;
}

.spec_dropdown.is-open .spec_dropdown_menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.spec_option {
  display: block;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-primary);
  transition: all 0.15s ease;
}

.spec_option:hover {
  background-color: var(--color-grey-100);
}

.spec_option.active,
.spec_option.is-active {
  color: var(--color-primary);
  font-weight: 600;
  background-color: rgba(var(--color-success-rgb), 0.06);
}

/* 數量選擇 */
.product_info_qty {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.qty_selector {
  display: inline-flex;
  align-items: center;
  border: 1.5px solid var(--color-grey-300);
  border-radius: 4px;
  overflow: hidden;
  width: fit-content;
}

.qty_btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-grey-100);
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--color-text-primary);
  font-family: var(--font-family-base);
  transition: background 0.2s ease;
}

.qty_btn:hover {
  background: var(--color-grey-200);
}

.qty_input {
  width: 56px;
  height: 40px;
  text-align: center;
  border: none;
  border-left: 1.5px solid var(--color-grey-300);
  border-right: 1.5px solid var(--color-grey-300);
  font-size: 0.95rem;
  font-weight: 500;
  font-family: var(--font-family-base);
  appearance: textfield;
  -moz-appearance: textfield;
  color: var(--color-text-primary);
}

.qty_input::-webkit-outer-spin-button,
.qty_input::-webkit-inner-spin-button {
  appearance: none;
  -webkit-appearance: none;
  margin: 0;
}

/* 操作按鈕 */
.product_info_actions {
  display: flex;
  gap: 12px;
  padding-top: 8px;
}

.product_info_actions .shop_btn {
  flex: 1;
  text-align: center;
  padding: 14px 24px;
  font-size: 0.95rem;
}

.product_info_actions .btn_add_cart {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1.5px solid var(--color-grey-300);
}

@media (hover: hover) {
  .product_info_actions .btn_add_cart:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background-color: transparent;
  }
}

.product_info_stock {
  font-size: 0.82rem;
  color: var(--color-primary);
  margin: 0;
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.product_info_stock i {
  font-size: 0.85rem;
  line-height: 1.7;
  flex-shrink: 0;
}

.product_info_stock + .product_info_stock {
  margin-top: -14px;
}

.product_info_stock.stock_out {
  color: var(--color-grey-500);
}

.btn_sold_out {
  width: 100%;
  padding: 14px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-family-base);
  color: var(--color-grey-500);
  background-color: var(--color-grey-100);
  border: 1.5px solid var(--color-grey-300);
  border-radius: 4px;
  cursor: not-allowed;
  text-align: center;
  letter-spacing: 0.1em;
}

/* ==============================================
   商品描述分隔
   ============================================== */
.product_desc_divider {
  padding: 60px 0 0;
}

.product_desc_divider .container {
  max-width: 1200px;
  text-align: center;
}

.product_desc_title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-grey-600);
  letter-spacing: 0.1em;
  margin: 0 0 16px;
}

.product_desc_line {
  position: relative;
  width: 100%;
  height: 1px;
  background-color: var(--color-grey-300);
}

.product_desc_line_accent {
  position: absolute;
  left: 50%;
  top: -1px;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background-color: var(--color-moonshine);
  border-radius: 2px;
}

/* ==============================================
   響應式
   ============================================== */
@media (max-width: 992px) {
  .product_shop_layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }

  .product_gallery {
    position: static;
  }
}

@media (max-width: 768px) {
  .breadcrumb_nav {
    padding-top: calc(var(--header-height) + 15px);
    padding-bottom: 5px;
  }

  .breadcrumb {
    font-size: 0.78rem;
  }

  /* 讓 section 本身作為溢出擋板 */
  .product_shop_section {
    padding: 20px 0 30px;
    overflow: hidden;
  }

  /* 明確設定 width + box-sizing，防止 content-box 模式下 padding 撐爆 */
  .product_shop_section .container,
  .product_desc_divider .container {
    width: 100%;
    max-width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }

  /* Grid 單欄：同時設 min-width: 0 防止子項撐爆 1fr */
  .product_shop_layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    min-width: 0;
  }

  /* Grid 子項必須設 min-width: 0，否則會超出 1fr */
  .product_gallery {
    position: static;
    width: 100%;
    min-width: 0;
    max-width: 100%;
    overflow: hidden;
  }

  .product_gallery_main {
    border-radius: 0;
    width: 100%;
    aspect-ratio: 1 / 1;
  }

  .product_gallery_thumbs {
    width: 100%;
    box-sizing: border-box;
  }

  .gallery_thumb {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
  }

  /* Grid 子項 product_info 同樣需要 min-width: 0 */
  .product_info {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    box-sizing: border-box;
    gap: 16px;
    overflow: hidden;
    word-break: break-word;
  }

  .product_info_title {
    font-size: var(--font-size-h3);
  }

  .product_info_summary,
  .product_info_promo {
    font-size: 0.85rem;
  }

  .product_info_bottom {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    box-sizing: border-box;
    margin-top: 0;
    gap: 18px;
  }

  .price_current {
    font-size: 1.4rem;
  }

  /* 規格下拉：強制不超出容器 */
  .product_info_spec,
  .spec_dropdown {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    box-sizing: border-box;
  }

  .spec_dropdown_toggle {
    width: 100%;
    min-width: 0;
    box-sizing: border-box;
  }

  /* 按鈕組：垂直排列，每個按鈕佔滿寬度 */
  .product_info_actions {
    flex-direction: column;
    width: 100%;
    min-width: 0;
  }

  .product_info_actions .shop_btn {
    width: 100%;
    min-width: 0;
    box-sizing: border-box;
    padding: 12px 16px;
  }

  .product_desc_divider {
    padding: 40px 0 0;
  }

  .product_desc_title {
    font-size: 1.1rem;
  }
}