/* ==========================================================
   产品详情页（product.html）— 与全站设计语言一致
   ========================================================== */

.pd-crumb { border-bottom: 1px solid var(--line); background: #fff; }
.pd-crumb .container { display: flex; align-items: center; gap: 10px; padding-top: 14px; padding-bottom: 14px; font-size: 12.5px; color: var(--muted); }
.pd-crumb a { color: var(--muted); }
.pd-crumb a:hover { color: var(--accent); }
.pd-crumb span:last-child { color: var(--ink); font-weight: 500; }

.pd-section { padding: clamp(36px, 5vw, 64px) 0; }
.pd-top { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(28px, 4vw, 56px); align-items: start; }
@media (max-width: 860px) { .pd-top { grid-template-columns: 1fr; } }

.pd-media { position: relative; background: var(--paper); border: 1px solid var(--line); overflow: hidden; }
.pd-media img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; display: block; }

.pd-copy .kicker { margin-bottom: 0; }
#pdDesc p { color: var(--ink-soft); font-size: 14.5px; margin-bottom: 14px; }

.pd-thumbs { display: flex; gap: 10px; margin-top: 8px; flex-wrap: wrap; }
.pd-thumbs img { width: 62px; height: 62px; object-fit: cover; border: 1px solid var(--line); cursor: pointer; transition: border-color .2s; background: var(--paper); }
.pd-thumbs img:hover, .pd-thumbs img.on { border-color: var(--accent); }

.pd-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.pd-trust { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--muted); }

/* 规格表 */
.pd-specs { margin-top: clamp(40px, 6vw, 72px); }
.pd-specs h2, .pd-sec-title { font-size: clamp(20px, 2.4vw, 26px); margin-bottom: 20px; }
.spec-table { border: 1px solid var(--line); }
.spec-row { display: grid; grid-template-columns: 220px 1fr; border-bottom: 1px solid var(--line); }
.spec-row:last-child { border-bottom: none; }
.spec-row .k { padding: 13px 18px; background: var(--paper); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.spec-row .v { padding: 13px 18px; font-size: 14px; color: var(--ink); }
@media (max-width: 640px) { .spec-row { grid-template-columns: 130px 1fr; } .spec-row .k, .spec-row .v { padding: 11px 12px; } }

/* 场景图 / 尺寸图 */
.pd-story, .pd-dims { background: var(--paper); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: clamp(40px, 6vw, 72px) 0; }
.pd-dims { background: #fff; border-top: none; }
.pd-story img, .pd-dims img { width: 100%; display: block; border: 1px solid var(--line); }

/* FAQ 手风琴 */
.pd-faq { padding: clamp(40px, 6vw, 72px) 0 clamp(48px, 6vw, 80px); }
.faq-list { max-width: 820px; margin: 0 auto; border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q { width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 16px; background: none; border: none; cursor: pointer;
  text-align: left; padding: 18px 4px; font: inherit; font-size: 15px; font-weight: 500; color: var(--ink); }
.faq-q:hover { color: var(--accent); }
.faq-q .arr { color: var(--accent); transition: transform .25s; flex-shrink: 0; }
.faq-item.open .faq-q .arr { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-item.open .faq-a { max-height: 300px; }
.faq-a p { padding: 0 4px 18px; color: var(--ink-soft); font-size: 14px; }

/* 产品卡：可点击 */
.prod-card .prod-media a.pimg { display: block; position: relative; }
.prod-card .prod-media a.pimg::after { content: "View Details →"; position: absolute; left: 0; right: 0; bottom: 0;
  background: linear-gradient(transparent, rgba(20,20,20,.72)); color: #fff; font-size: 12.5px; letter-spacing: .04em;
  padding: 34px 14px 12px; opacity: 0; transition: opacity .25s; }
.prod-card:hover .prod-media a.pimg::after { opacity: 1; }
.prod-card h3 a { color: inherit; }
.prod-card h3 a:hover { color: var(--accent); }