/* ============================================================
 * 产品详情页 & 产品列表页 样式
 * ============================================================ */

/* ============================================================
 * 产品详情页
 * ============================================================ */
.product-detail-page{padding:0 0 80px}
.product-crumb{display:flex;align-items:center;gap:8px;font-size:14px;color:#66788a;margin:24px 0;padding:0 0 16px;border-bottom:1px solid #dce5ec}
.product-crumb a{color:#017173;transition:color .2s}
.product-crumb a:hover{color:#017173}
.product-crumb .sep{color:#dce5ec}
.product-crumb strong{font-weight:600;color:#182635}

.product-hero-section{padding:0}
.product-hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:start}
.product-gallery{position:sticky;top:100px}
.gallery-main{background:#fff;border:1px solid #dce5ec;border-radius:12px;overflow:hidden}
.gallery-main-image{width:100%;height:auto;display:block;object-fit:contain;background:#fff}
.gallery-thumbs{display:flex;gap:10px;padding:16px;overflow-x:auto}
.gallery-thumbs .thumb-btn{background:none;border:0;padding:0;cursor:pointer;border-radius:8px;overflow:hidden}
.gallery-thumbs .thumb-btn img{width:72px;height:72px;object-fit:cover;border-radius:6px;opacity:.6;transition:.2s}
.gallery-thumbs .thumb-btn:hover img,.gallery-thumbs .thumb-btn.active img{opacity:1}
.gallery-disclaimer{margin-top:12px;font-size:12px;color:#66788a;text-align:center}

.product-summary{padding-top:16px}
.product-header{margin-bottom:16px}
.product-category{font-size:13px;color:#017173;font-weight:700;letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px}
.product-model{font-size:15px;color:#017173;font-weight:700;margin:8px 0}
.product-summary h1{font-size:clamp(30px,3.5vw,42px);letter-spacing:-.02em;line-height:1.2;margin:12px 0 16px}
.product-intro{color:#53687a;font-size:16px;line-height:1.85;margin-bottom:24px}

/* 关键参数 - 首屏展示 */
.product-key-specs{margin:24px 0;padding:20px;background:#f7fafc;border:1px solid #dce5ec;border-radius:12px}
.key-specs-list{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:0;padding:0;list-style:none}
.key-specs-list dt{font-size:12px;color:#66788a;letter-spacing:.04em;text-transform:uppercase;margin-bottom:6px}
.key-specs-list dd{margin:0;font-size:18px;font-weight:700;color:#182635}
@media(max-width:768px){
  .key-specs-list{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:480px){
  .key-specs-list{grid-template-columns:1fr}
}

.selection-points{margin-top:24px;padding:20px;background:#f7fafc;border:1px solid #dce5ec;border-radius:12px}
.selection-points ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px}
.selection-points li{display:flex;gap:10px;align-items:flex-start;color:#182635}
.selection-points li span{flex:none;width:32px;height:32px;border-radius:50%;background:#017173;color:#fff;display:grid;place-items:center;font-weight:900;font-size:13px;flex:none}
.selection-points li p{margin:0;color:#364a5d;line-height:1.6}
.product-cta-group{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.response-note{margin-top:16px;font-size:13px;color:#66788a}

.product-specs-section{margin-top:64px}
.section-header{margin-bottom:32px}
.section-tag{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.12em;color:#017173;background:#eaf4fd;padding:4px 10px;border-radius:4px;text-transform:uppercase;margin-bottom:10px}
.section-header h2{margin:0}
.section-subtitle{margin-top:8px;color:#66788a;max-width:60ch}
.specs-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.spec-card{padding:18px 20px;border:1px solid #dce5ec;border-radius:12px;background:#f7fafc;transition:.2s}
.spec-card:hover{box-shadow:0 6px 18px rgba(10,37,62,.1);border-color:#c3d6e5}
.spec-label{display:block;font-size:12px;color:#66788a;letter-spacing:.04em;text-transform:uppercase;margin-bottom:6px}
.spec-value{font-size:15px;font-weight:700;color:#182635}

.product-description-section{margin-top:64px}
.product-description-content{max-width:860px}

/* 产品说明三段式 */
.description-section{margin-bottom:40px}
.description-section:last-child{margin-bottom:0}
.description-section h3{font-size:18px;margin:0 0 12px;color:#182635;padding-bottom:8px;border-bottom:2px solid #017173}
.description-section p{color:#364a5d;line-height:1.85;margin-bottom:16px}
.description-section ul{margin:16px 0;padding-left:24px}
.description-section li{margin-bottom:8px;line-height:1.7;color:#364a5d}
.description-section strong{color:#182635}

.selection-support-section{margin-top:64px;padding:48px;background:linear-gradient(135deg,#015a5c,#016e70 60%,#017173);border-radius:22px;color:#fff}
.selection-support-section .section-header{margin-bottom:24px;text-align:center}
.selection-support-section .section-tag{background:rgba(255,255,255,.15);color:#fff}
.selection-support-section h2{color:#fff;margin-bottom:12px}
.selection-support-section p{color:#bcd8ec;margin:0 0 14px}
.selection-cta-group{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

.related-products-section{margin-top:64px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.related-card{display:block;text-decoration:none;color:inherit;border:1px solid #dce5ec;border-radius:16px;padding:24px;background:#fff;transition:.25s}
.related-card:hover{transform:translateY(-6px);box-shadow:0 14px 40px rgba(10,37,62,.12);border-color:#c3d6e5}
.related-card .related-category{font-size:11px;color:#017173;font-weight:800;letter-spacing:.1em;text-transform:uppercase;display:block;margin-bottom:8px}
.related-card h3{margin:8px 0 6px;font-size:17px;color:#182635}
.related-card .view-link{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:#017173;font-weight:700;transition:.2s}
.related-card:hover .view-link{color:#017173}

/* 相关推荐为空时隐藏整个区块 */
.related-products-section:has(.related-grid:empty),
.related-products-section:has(.related-grid:only-child):empty{
  display:none;
}

/* FAQ 区域 - 默认折叠 */
.faq-section{margin-top:64px}
.faq-list details{border-bottom:1px solid #dce5ec;padding:4px 0}
.faq-list summary{cursor:pointer;list-style:none;display:flex;gap:14px;align-items:center;padding:16px 4px;font-weight:700;font-size:16.5px;user-select:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary .pm{flex:none;width:28px;height:28px;border-radius:50%;background:#edf5fa;color:#017173;display:grid;place-items:center;font-weight:900;font-size:16px;transition:.25s}
details[open] summary .pm{background:#017173;color:#fff;transform:rotate(45deg)}
.faq-list .answer{padding:2px 46px 20px;color:#53687a;font-size:15px;line-height:1.85}

/* 图片画廊 - 白底、完整比例、不裁切 */
.gallery-main-image img{
  width:100%;
  height:auto;
  display:block;
  object-fit:contain;
  background:#fff;
}
.gallery-thumbs .thumb-btn img{
  object-fit:cover;
}

/* 响应式调整 */
@media(max-width:1080px){
  .product-hero-grid{grid-template-columns:1fr}
  .product-gallery{position:static;max-width:720px;margin:0 auto}
  .product-hero-grid{gap:32px}
  .product-specs-section{margin-top:48px}
  .product-description-section{margin-top:48px}
  .selection-support-section{margin-top:48px}
  .related-products-section{margin-top:48px}
  .faq-section{margin-top:48px}
  .product-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .product-hero-grid{grid-template-columns:1fr}
  .product-gallery{position:static}
  .specs-grid{grid-template-columns:1fr 1fr}
  .product-grid{grid-template-columns:1fr 1fr}
  .related-grid{grid-template-columns:1fr}
  .process-grid{grid-template-columns:1fr 1fr}
  .specs-grid{grid-template-columns:1fr}
  .chips{justify-content:center}
  .key-specs-list{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .product-hero-grid{grid-template-columns:1fr}
  .product-gallery{position:static}
  .specs-grid{grid-template-columns:1fr 1fr}
  .product-grid{grid-template-columns:1fr 1fr}
  .related-grid{grid-template-columns:1fr}
  .process-grid{grid-template-columns:1fr 1fr}
  .specs-grid{grid-template-columns:1fr}
  .chips{justify_content:center}
}
@media(max-width:480px){
  .product-grid{grid-template-columns:1fr}
  .specs-grid{grid-template-columns:1fr}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%;justify-content:center}
  .chips{justify-content:center}
  .stats .wrap{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .key-specs-list{grid-template-columns:1fr}
}

/* ============================================================
 * 产品列表页
 * ============================================================ */
.product-list-page{padding-top:0}
.page-hero{background:var(--navy);color:#fff;padding:56px 0}
.page-hero .wrap{display:flex;flex-direction:column;align-items:flex-start}
.page-hero .eyebrow{color:#ff8d80;font-weight:800;font-size:11px;letter-spacing:.18em;text-transform:uppercase;margin-bottom:12px}
.page-title{font-size:clamp(36px,4vw,52px);letter-spacing:-.02em;margin:0;color:#fff}
.product-list-page .wrap{width:min(1220px,calc(100% - 48px));margin:auto}
.product-list-page .wrap{padding:0 0 80px}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:14px;color:#66788a;margin:24px 0 16px}
.breadcrumb a{color:#017173;transition:color .2s}
.breadcrumb a:hover{color:#017173}
.breadcrumb span{color:#dce5ec}
.breadcrumb strong{font-weight:600;color:#182635}

.subcats{display:flex;gap:16px;flex-wrap:wrap;margin:24px 0 32px}
.subcat{color:#017173;font-weight:600;padding:10px 18px;border:1px solid #dce5ec;border-radius:8px;transition:.2s}
.subcat:hover{color:#fff;background:#017173;border-color:#017173}

.product-grid-section{margin-top:8px}
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.list-product-card{display:block;text-decoration:none;color:inherit;border:1px solid #dce5ec;border-radius:16px;overflow:hidden;background:#fff;transition:.25s}
.list-product-card:hover{transform:translateY(-6px);box-shadow:0 14px 40px rgba(10,37,62,.12);border-color:#c3d6e5}
.prod-image{aspect-ratio:4/3;background:linear-gradient(135deg,#f3f6f8,#e6edf1);display:grid;place-items:center;overflow:hidden}
.prod-image img{width:100%;height:100%;object-fit:contain;transition:transform .35s ease}
.list-product-card:hover .prod-image img{transform:scale(1.03)}
.image-placeholder{width:100%;height:100%;display:grid;place-items:center;color:#66788a;font-size:14px;background:#f3f6f8}
.prod-body{padding:20px 18px 18px}
.prod-body h2{font-size:17.5px;letter-spacing:-.01em;margin:0 0 6px;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.prod-model{font-size:13px;color:#017173;font-weight:700;margin-bottom:10px}
.prod-specs{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 16px}
.spec-item{font-size:12px;color:#53687a;background:#f4f8fb;padding:4px 10px;border-radius:4px}
.spec-label{color:#66788a;font-size:11px}
.spec-value{font-weight:700;color:#182635}
.prod-body .btn{margin-top:4px;padding:10px 16px;font-size:14px;min-height:40px}
.btn-text{background:transparent;color:#017173;border-color:#017173;font-weight:600}
.btn-text:hover{background:#017173;color:#fff}

.pagination-wrap{display:flex;justify-content:center;padding:40px 0 20px}
.list-cta{margin-top:48px;padding:40px;background:linear-gradient(135deg,#10314f,#08273e);border-radius:16px;color:#fff;text-align:center}
.list-cta h2{font-size:22px;margin:0 0 12px}
.list-cta p{color:#bcd8ec;margin:0 0 20px}
.list-cta .btn{padding:14px 30px;font-size:16px;min-height:48px}

@media(max-width:1080px){
  .product-hero-grid{grid-template-columns:1fr}
  .product-gallery{position:static;max-width:720px;margin:0 auto}
  .product-hero-grid{gap:32px}
  .product-specs-section{margin-top:48px}
  .product-description-section{margin-top:48px}
  .selection-support-section{margin-top:48px}
  .related-products-section{margin-top:48px}
  .faq-section{margin-top:48px}
  .product-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .product-hero-grid{grid-template-columns:1fr}
  .product-gallery{position:static}
  .specs-grid{grid-template-columns:1fr 1fr}
  .product-grid{grid-template-columns:1fr 1fr}
  .related-grid{grid-template-columns:1fr}
  .process-grid{grid-template-columns:1fr 1fr}
  .specs-grid{grid-template-columns:1fr}
  .chips{justify-content:center}
  .key-specs-list{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .product-hero-grid{grid-template-columns:1fr}
  .product-gallery{position:static}
  .specs-grid{grid-template-columns:1fr 1fr}
  .product-grid{grid-template-columns:1fr 1fr}
  .related-grid{grid-template-columns:1fr}
  .process-grid{grid-template-columns:1fr 1fr}
  .specs-grid{grid-template-columns:1fr}
  .chips{justify-content:center}
}
@media(max-width:480px){
  .product-grid{grid-template-columns:1fr}
  .specs-grid{grid-template-columns:1fr}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%;justify-content:center}
  .chips{justify-content:center}
  .stats .wrap{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .key-specs-list{grid-template-columns:1fr}
}

/* ============================================================
 * 特殊定制阀门页 (lists_custom.htm)
 * ============================================================ */
.custom-valve-page{padding:0 0 80px}
.custom-valve-page .page-hero{background:var(--navy);color:#fff;padding:56px 0}
.custom-valve-page .page-hero .wrap{display:flex;flex-direction:column;align-items:flex-start}
.custom-valve-page .eyebrow{color:#ff8d80;font-weight:800;font-size:11px;letter-spacing:.18em;text-transform:uppercase;margin-bottom:12px}
.custom-valve-page .page-title{font-size:clamp(36px,4vw,52px);letter-spacing:-.02em;margin:0;color:#fff}

.custom-shell{width:min(1220px,calc(100% - 48px));margin:auto;padding:0 0 80px}
.custom-shell .breadcrumb{display:flex;align-items:center;gap:8px;font-size:14px;color:#66788a;margin:24px 0 16px}
.custom-shell .breadcrumb a{color:#017173;transition:color .2s}
.custom-shell .breadcrumb a:hover{color:#017173}
.custom-shell .breadcrumb span{color:#dce5ec}
.custom-shell .breadcrumb strong{font-weight:600;color:#182635}

.custom-hero{margin-top:32px}
.custom-hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:start}
.custom-hero-content{padding-top:16px}
.custom-tagline{font-size:13px;color:#017173;font-weight:700;letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px}
.custom-hero-content h2{font-size:clamp(30px,3.5vw,42px);letter-spacing:-.02em;line-height:1.2;margin:12px 0 16px}
.custom-intro{color:#53687a;font-size:16px;line-height:1.85;margin-bottom:24px}
.custom-cta-group{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.custom-process{list-style:none;padding:0;margin:24px 0 0;display:flex;flex-direction:column;gap:12px}
.custom-process li{display:flex;gap:10px;align-items:flex-start;color:#182635;padding:16px;background:#f7fafc;border:1px solid #dce5ec;border-radius:12px}
.custom-process li span{flex:none;width:32px;height:32px;border-radius:50%;background:#017173;color:#fff;display:grid;place-items:center;font-weight:900;font-size:13px}
.custom-process li p{margin:0;color:#364a5d;line-height:1.6}

.custom-hero-visual{position:sticky;top:100px}
.custom-visual-card{background:#fff;border:1px solid #dce5ec;border-radius:12px;padding:24px;text-align:center}
.custom-visual-card svg{width:100%;max-width:400px;height:auto}
.custom-visual-caption{margin-top:16px;font-size:14px;color:#66788a;font-weight:600}

.custom-requirements{margin-top:64px}
.custom-requirements .section-head{margin-bottom:32px}
.custom-requirements .kicker{color:#017173;font-weight:800;font-size:11px;letter-spacing:.12em;text-transform:uppercase;margin-bottom:10px}
.custom-requirements h2{margin:0}
.requirements-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.req-card{padding:24px;border:1px solid #dce5ec;border-radius:16px;background:#fff;transition:.25s}
.req-card:hover{transform:translateY(-6px);box-shadow:0 14px 40px rgba(10,37,62,.12);border-color:#c3d6e5}
.req-icon{display:inline-flex;width:48px;height:48px;background:#edf5fa;border-radius:12px;color:#017173;margin-bottom:16px}
.req-icon svg{width:24px;height:24px;margin:auto}
.req-card h3{margin:0 0 12px;font-size:18px;color:#182635}
.req-card ul{margin:0;padding-left:20px;color:#53687a;line-height:2}
.req-card li{margin-bottom:8px}

.custom-process-section{margin-top:64px}
.custom-process .section-head{margin-bottom:32px}
.process-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.process-step{padding:24px;border:1px solid #dce5ec;border-radius:16px;background:#fff;transition:.25s}
.process-step:hover{transform:translateY(-6px);box-shadow:0 14px 40px rgba(10,37,62,.12);border-color:#c3d6e5}
.step-num{display:inline-block;width:32px;height:32px;border-radius:50%;background:#017173;color:#fff;font-weight:900;font-size:13px;margin-bottom:12px}
.process-step h3{margin:0 0 8px;font-size:18px;color:#182635}
.process-step p{margin:0;color:#53687a;line-height:1.7}

.custom-cta{margin-top:64px}
.custom-cta-card{padding:48px;background:linear-gradient(135deg,#10314f,#08273e);border-radius:16px;color:#fff;text-align:center}
.custom-cta-card h2{font-size:24px;margin:0 0 12px}
.custom-cta-card p{color:#bcd8ec;margin:0 0 20px}
.custom-cta-card .btn{padding:14px 30px;font-size:16px;min-height:48px}

@media(max-width:1080px){
  .custom-hero-grid{grid-template-columns:1fr}
  .custom-hero-visual{position:static;max-width:720px;margin:0 auto}
  .custom-hero-grid{gap:32px}
}
@media(max-width:768px){
  .requirements-grid{grid-template-columns:1fr}
  .process-grid{grid-template-columns:1fr}
  .custom-process li{flex-direction:column;align-items:flex-start}
}
@media(max-width:480px){
  .custom-cta-card{padding:32px 20px}
  .custom-cta-card .btn{width:100%;justify-content:center}
}