/* ============================================
   product.css — 建康商城 商品详情页（专属定制版式）
   结构：面包屑 → 主区(左图库 sticky + 右信息·炭灰价格卡) → sticky 锚点 → 详情/商家/服务保障/相关推荐
   配色：翡翠绿 #16A34A + 石墨炭灰 #1F2A26 + 薄荷白底（去橙）
   类名前缀：jk_pd_
   ============================================ */

.jk_pd_page { background: var(--jk-cream); padding-bottom: 54px; }
.jk_pd_wrap { max-width: 1280px; margin: 0 auto; padding: 0 20px; }

/* ① 面包屑 */
.jk_pd_crumb_bar { background: #fff; border-bottom: 1px solid var(--jk-line); }
.jk_pd_crumb { max-width: 1280px; margin: 0 auto; padding: 14px 20px; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--jk-ink-2); flex-wrap: wrap; }
.jk_pd_crumb a { color: var(--jk-ink-2); transition: color .18s; }
.jk_pd_crumb a:hover { color: var(--jk-green); }
.jk_pd_crumb .sep { color: var(--jk-ink-3); }
.jk_pd_crumb .cur { color: var(--jk-green-deep); font-weight: 500; }

/* ② 主区 */
.jk_pd_main { display: grid; grid-template-columns: 460px 1fr; gap: 40px; padding: 28px 0 8px; align-items: start; }

/* 左：图库（sticky） */
.jk_pd_gallery { position: sticky; top: 62px; }
.jk_pd_bigimg {
    position: relative; background: #fff; border: 1px solid var(--jk-line);
    border-radius: var(--jk-radius-lg); overflow: hidden; aspect-ratio: 1 / 1;
    display: flex; align-items: center; justify-content: center;
}
.jk_pd_bigimg img { width: 100%; height: 100%; object-fit: contain; }
.jk_pd_tags { position: absolute; top: 14px; left: 14px; display: flex; gap: 8px; z-index: 2; }
.jk_pd_tag { padding: 4px 12px; border-radius: 999px; font-size: 11px; font-weight: 700; color: #fff; letter-spacing: .5px; }
.jk_pd_tag_new { background: var(--jk-green); }
.jk_pd_tag_hot { background: var(--jk-graphite); }
.jk_pd_tag_rec { background: var(--jk-green-deep); }
.jk_pd_thumbs { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.jk_pd_thumb { width: 66px; height: 66px; border: 2px solid var(--jk-line); border-radius: 10px; overflow: hidden; cursor: pointer; background: #fff; transition: border-color .18s; }
.jk_pd_thumb img { width: 100%; height: 100%; object-fit: contain; }
.jk_pd_thumb.active, .jk_pd_thumb:hover { border-color: var(--jk-green); }

/* 右：信息 */
.jk_pd_info { min-width: 0; }
.jk_pd_name { font-size: 24px; font-weight: 800; color: var(--jk-graphite); line-height: 1.45; }
.jk_pd_subtitle { font-size: 14px; color: var(--jk-ink-2); margin-top: 10px; line-height: 1.75; }

/* 炭灰价格卡（青柠价格） */
.jk_pd_price_box {
    margin-top: 20px; background: var(--jk-grad-graphite); border-radius: var(--jk-radius);
    padding: 18px 24px; position: relative; overflow: hidden;
}
.jk_pd_price_box::before {
    content: '\f0d1'; font-family: 'Font Awesome 5 Free'; font-weight: 900;
    position: absolute; right: -10px; bottom: -18px; font-size: 90px; color: rgba(78,209,126,.08); line-height: 1;
}
.jk_pd_price_label { font-size: 12px; color: rgba(255,255,255,.66); position: relative; z-index: 1; }
.jk_pd_price_row { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-top: 4px; position: relative; z-index: 1; }
.jk_pd_price_cur { font-size: 38px; font-weight: 900; color: var(--jk-lime); font-family: Arial, sans-serif; line-height: 1.1; }
.jk_pd_price_cur::before { content: '¥'; font-size: 20px; margin-right: 2px; }
.jk_pd_price_old { font-size: 15px; color: rgba(255,255,255,.5); text-decoration: line-through; }
.jk_pd_price_save { font-size: 12.5px; color: #fff; background: rgba(78,209,126,.22); padding: 3px 12px; border-radius: 999px; font-weight: 600; }

/* 服务承诺小条 */
.jk_pd_promise_strip { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 16px; padding: 12px 0; border-bottom: 1px dashed var(--jk-line); }
.jk_pd_promise_strip span { font-size: 12.5px; color: var(--jk-ink-2); display: inline-flex; align-items: center; gap: 6px; }
.jk_pd_promise_strip i { color: var(--jk-green); }

/* 销量 / 浏览 */
.jk_pd_meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; margin-top: 14px; font-size: 13px; color: var(--jk-ink-2); }
.jk_pd_meta > span i { color: var(--jk-green); margin-right: 4px; }
.jk_pd_meta strong { color: var(--jk-graphite); }
.jk_pd_meta_tag { padding: 3px 10px; border-radius: 999px; font-size: 11.5px; font-weight: 700; display: inline-flex; align-items: center; gap: 4px; }
.jk_pd_meta_tag_new { background: var(--jk-green-tint); color: var(--jk-green-deep); }
.jk_pd_meta_tag_hot { background: var(--jk-graphite); color: var(--jk-lime); }

/* 规格 */
.jk_pd_specs { margin-top: 20px; }
.jk_pd_spec_group { display: flex; gap: 14px; margin-bottom: 14px; align-items: flex-start; }
.jk_pd_spec_label { flex: 0 0 56px; font-size: 13px; color: var(--jk-ink-2); padding-top: 9px; }
.jk_pd_spec_values { display: flex; flex-wrap: wrap; gap: 10px; flex: 1; }
.jk_pd_spec_btn { padding: 8px 18px; border: 1.5px solid var(--jk-line); background: #fff; border-radius: 10px; font-size: 13px; color: var(--jk-ink); cursor: pointer; transition: all .18s; font-family: inherit; }
.jk_pd_spec_btn:hover { border-color: var(--jk-green); color: var(--jk-green-deep); }
.jk_pd_spec_btn.active { border-color: var(--jk-green); background: var(--jk-green-tint); color: var(--jk-green-deep); font-weight: 700; }
.jk_pd_spec_btn.disabled { opacity: .4; cursor: not-allowed; text-decoration: line-through; }
.jk_pd_spec_tip { font-size: 12.5px; color: var(--jk-ink-2); margin-top: 2px; }
.jk_pd_spec_tip i { color: var(--jk-green); }

/* 属性表 */
.jk_pd_attrs { margin-top: 18px; background: #fff; border: 1px solid var(--jk-line); border-radius: var(--jk-radius); padding: 4px 18px; }
.jk_pd_attr { display: flex; gap: 14px; padding: 10px 0; font-size: 13px; border-bottom: 1px solid var(--jk-line-soft); }
.jk_pd_attr:last-child { border-bottom: none; }
.jk_pd_attr_k { flex: 0 0 54px; color: var(--jk-ink-3); }
.jk_pd_attr_v { color: var(--jk-ink); }
.jk_pd_attr_v a { color: var(--jk-green-deep); }
.jk_pd_attr_v a:hover { color: var(--jk-green); }
.jk_pd_stock_ok { color: var(--jk-green-deep); font-weight: 600; }
.jk_pd_stock_ok i { color: var(--jk-green); margin-right: 4px; }
.jk_pd_stock_out { color: #c0392b; font-weight: 600; }
.jk_pd_stock_out i { margin-right: 4px; }

/* 购买 */
.jk_pd_form { margin-top: 22px; }
.jk_pd_qty_wrap { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.jk_pd_qty_label { font-size: 13px; color: var(--jk-ink-2); }
.jk_qty { display: inline-flex; border: 1.5px solid var(--jk-line); border-radius: 10px; overflow: hidden; }
.jk_qty button { width: 42px; height: 44px; border: none; background: var(--jk-cream); color: var(--jk-graphite); font-size: 18px; cursor: pointer; transition: background .18s; }
.jk_qty button:hover:not(:disabled) { background: var(--jk-green-tint); color: var(--jk-green-deep); }
.jk_qty button:disabled { opacity: .4; cursor: not-allowed; }
.jk_qty input { width: 62px; height: 44px; border: none; border-left: 1.5px solid var(--jk-line); border-right: 1.5px solid var(--jk-line); text-align: center; font-size: 15px; font-weight: 700; color: var(--jk-graphite); background: #fff; }

.jk_pd_actions { display: flex; gap: 14px; align-items: stretch; }
.jk_pd_btn { flex: 1; display: inline-flex; align-items: center; justify-content: center; gap: 9px; height: 52px; border: none; border-radius: 12px; font-size: 16px; font-weight: 700; cursor: pointer; transition: all .2s; font-family: inherit; }
.jk_pd_btn_cart { background: var(--jk-green-tint); color: var(--jk-green-deep); border: 1.5px solid var(--jk-green); }
.jk_pd_btn_cart:hover:not(:disabled) { background: var(--jk-green); color: #fff; }
.jk_pd_btn_buy { background: var(--jk-grad-graphite); color: #fff; box-shadow: var(--jk-shadow-graphite); }
.jk_pd_btn_buy:hover:not(:disabled) { filter: brightness(1.14); color: #fff; }
.jk_pd_btn:disabled, .jk_pd_btn_disabled { opacity: .5; cursor: not-allowed; }
.jk_pd_btn_fav { width: 52px; height: 52px; flex: 0 0 auto; border: 1.5px solid var(--jk-line); background: #fff; border-radius: 12px; color: var(--jk-ink-2); font-size: 18px; cursor: pointer; transition: all .2s; }
.jk_pd_btn_fav:hover, .jk_pd_btn_fav.active { border-color: #e05555; color: #e05555; background: #fff5f5; }

/* 所属商家小卡 */
.jk_pd_merchant_inline { display: flex; align-items: center; gap: 14px; margin-top: 20px; padding: 14px 18px; background: #fff; border: 1px solid var(--jk-line); border-radius: var(--jk-radius); transition: all .2s; }
.jk_pd_merchant_inline:hover { border-color: var(--jk-green); box-shadow: var(--jk-shadow); }
.jk_pd_merchant_inline_logo { width: 48px; height: 48px; border-radius: 12px; overflow: hidden; background: var(--jk-green-tint); color: var(--jk-green-deep); display: inline-flex; align-items: center; justify-content: center; font-weight: 700; font-size: 18px; flex-shrink: 0; }
.jk_pd_merchant_inline_logo img { width: 100%; height: 100%; object-fit: cover; }
.jk_pd_merchant_inline_text { flex: 1; min-width: 0; }
.jk_pd_merchant_inline_name { font-size: 15px; font-weight: 700; color: var(--jk-graphite); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.jk_pd_merchant_tag { font-size: 11px; font-weight: 600; color: var(--jk-green); background: var(--jk-green-tint); padding: 2px 8px; border-radius: 999px; }
.jk_pd_merchant_tag i { margin-right: 2px; }
.jk_pd_merchant_inline_count { font-size: 12.5px; color: var(--jk-ink-3); margin-top: 3px; }
.jk_pd_merchant_inline_count i { color: var(--jk-green); margin-right: 4px; }
.jk_pd_merchant_inline_more { flex-shrink: 0; font-size: 13px; color: var(--jk-green-deep); font-weight: 600; }

/* ③ sticky 锚点 tab */
.jk_pd_anchor { position: sticky; top: 50px; z-index: 50; background: #fff; border: 1px solid var(--jk-line); border-radius: var(--jk-radius); margin-top: 16px; display: flex; gap: 4px; padding: 6px; box-shadow: var(--jk-shadow-sm); }
.jk_pd_anchor a { padding: 10px 22px; border-radius: 8px; font-size: 14px; font-weight: 600; color: var(--jk-ink-2); transition: all .18s; white-space: nowrap; }
.jk_pd_anchor a:hover { color: var(--jk-green-deep); background: var(--jk-green-tint); }
.jk_pd_anchor a.active { background: var(--jk-grad-green); color: #fff; }

/* 区块 */
.jk_pd_section { background: #fff; border: 1px solid var(--jk-line); border-radius: var(--jk-radius-lg); padding: 28px 30px; margin-top: 20px; }
.jk_pd_section_title { font-size: 19px; font-weight: 800; color: var(--jk-graphite); margin-bottom: 20px; padding-left: 14px; position: relative; display: flex; align-items: baseline; gap: 10px; }
.jk_pd_section_title::before { content: ''; position: absolute; left: 0; top: 3px; bottom: 3px; width: 4px; border-radius: 4px; background: var(--jk-grad-green); }
.jk_pd_section_title small { font-size: 12px; font-weight: 600; color: var(--jk-ink-3); letter-spacing: 1px; }
.jk_pd_content_body { font-size: 14.5px; line-height: 1.9; color: var(--jk-ink); }
.jk_pd_content_body img { max-width: 100%; height: auto; border-radius: 10px; margin: 10px 0; }
.jk_pd_content_body p { margin-bottom: 12px; }
.jk_pd_content_empty { text-align: center; padding: 50px 20px; color: var(--jk-ink-3); }
.jk_pd_content_empty i { font-size: 40px; color: var(--jk-lime-soft); margin-bottom: 12px; }
.jk_pd_content_empty p { font-size: 14px; }

/* 商家信息 */
.jk_pd_mch_grid { display: flex; gap: 24px; align-items: flex-start; }
.jk_pd_mch_logo_big { width: 96px; height: 96px; border-radius: 18px; overflow: hidden; flex-shrink: 0; background: var(--jk-green-tint); color: var(--jk-green-deep); display: inline-flex; align-items: center; justify-content: center; font-size: 36px; font-weight: 800; }
.jk_pd_mch_logo_big img { width: 100%; height: 100%; object-fit: cover; }
.jk_pd_mch_body { flex: 1; min-width: 0; }
.jk_pd_mch_name { font-size: 18px; font-weight: 800; color: var(--jk-graphite); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.jk_pd_mch_info_grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 24px; margin: 16px 0; }
.jk_pd_mch_info_item { font-size: 13px; color: var(--jk-ink-2); display: flex; align-items: center; gap: 8px; }
.jk_pd_mch_info_item i { color: var(--jk-green); width: 16px; text-align: center; }
.jk_pd_mch_info_item strong { color: var(--jk-ink); font-weight: 600; }
.jk_pd_mch_desc { font-size: 13.5px; line-height: 1.8; color: var(--jk-ink-2); background: var(--jk-cream); border-radius: 10px; padding: 14px 16px; margin-bottom: 16px; }
.jk_pd_mch_btns { display: flex; gap: 12px; flex-wrap: wrap; }
.jk_pd_mch_btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 22px; border-radius: 999px; font-size: 13.5px; font-weight: 600; border: 1.5px solid var(--jk-line); color: var(--jk-graphite); transition: all .2s; }
.jk_pd_mch_btn:hover { border-color: var(--jk-green); color: var(--jk-green-deep); }
.jk_pd_mch_btn_main { background: var(--jk-grad-green); color: #fff; border-color: transparent; }
.jk_pd_mch_btn_main:hover { color: #fff; filter: brightness(1.06); border-color: transparent; }

/* 服务保障卡 */
.jk_pd_promise_grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.jk_pd_promise_card { padding: 26px 20px; border-radius: var(--jk-radius); border: 1px solid var(--jk-line); text-align: center; transition: all .22s; }
.jk_pd_promise_card:hover { transform: translateY(-4px); box-shadow: var(--jk-shadow-lg); border-color: transparent; }
.jk_pd_promise_icon { width: 54px; height: 54px; border-radius: 14px; margin: 0 auto 14px; display: inline-flex; align-items: center; justify-content: center; font-size: 24px; background: var(--jk-green-tint); color: var(--jk-green); }
.jk_pd_promise_card_dark .jk_pd_promise_icon { background: var(--jk-graphite); color: var(--jk-lime); }
.jk_pd_promise_card h3 { font-size: 15.5px; font-weight: 700; color: var(--jk-graphite); margin-bottom: 8px; }
.jk_pd_promise_card p { font-size: 12.5px; line-height: 1.7; color: var(--jk-ink-2); }

/* 相关推荐 */
.jk_pd_related_grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

/* 响应式 */
@media (max-width: 992px) {
    .jk_pd_main { grid-template-columns: 1fr; gap: 26px; }
    .jk_pd_gallery { position: static; max-width: 480px; }
    .jk_pd_anchor { top: 0; }
    .jk_pd_promise_grid { grid-template-columns: repeat(2, 1fr); }
    .jk_pd_related_grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    .jk_pd_mch_grid { flex-direction: column; }
    .jk_pd_mch_info_grid { grid-template-columns: 1fr; }
    .jk_pd_related_grid { grid-template-columns: repeat(2, 1fr); }
    .jk_pd_anchor { overflow-x: auto; }
    .jk_pd_anchor a { padding: 10px 16px; }
    .jk_pd_price_cur { font-size: 32px; }
    .jk_pd_section { padding: 22px 18px; }
}
@media (max-width: 480px) {
    .jk_pd_actions { flex-wrap: wrap; }
    .jk_pd_btn { flex: 1 1 100%; }
    .jk_pd_btn_fav { flex: 0 0 auto; width: 100%; }
    .jk_pd_promise_grid { grid-template-columns: 1fr 1fr; }
    .jk_pd_related_grid { grid-template-columns: 1fr 1fr; }
}