/* ===== 产品中心：左分类 + 右图片墙 ===== */
.gallery-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:22px;align-items:start}
/* 左侧分类导航：LineSidebar 行边栏效果；sticky 跟随页面，鼠标悬停时滚轮只滚动内部 */
.category-nav{position:sticky;top:86px;align-self:start;max-height:calc(100vh - 140px);overflow-y:auto;padding:10px 6px 10px 0;scrollbar-width:thin;z-index:10}
/* 右侧图片墙：内部滚动 */
.product-gallery{max-height:calc(100vh - 170px);overflow-y:auto;min-height:340px;padding-right:6px;scrollbar-width:thin}
.product-gallery::-webkit-scrollbar{width:6px}
.product-gallery::-webkit-scrollbar-thumb{background:#c9d6e2;border-radius:3px}
.gallery-empty{display:grid;place-items:center;min-height:320px;border:1px dashed var(--line);border-radius:10px;color:#8ba0b4;font-size:12px;background:var(--panel)}
/* 桌面端产品页是固定工作区：顶部和左栏不随页面滚动，仅右侧图片墙滚动。 */
@media(min-width:981px){
  body.product-page-mode{overflow:hidden}
  body.product-page-mode .company-footer,body.product-page-mode .footer-top{display:none}
  body.product-page-mode main{height:calc(100vh - 66px);overflow:hidden}
  body.product-page-mode #products{height:100%;min-height:0;padding:92px 0 18px;overflow:hidden}
  body.product-page-mode #products>.wrap{display:grid;grid-template-rows:auto minmax(0,1fr);height:100%;min-height:0}
  body.product-page-mode #products .heading{margin-bottom:20px}
  body.product-page-mode #products .gallery-layout{height:100%;min-height:0;align-items:stretch}
  body.product-page-mode #products .category-nav{position:relative;top:auto;height:100%;max-height:none;min-height:0;overflow-y:auto;overscroll-behavior:contain}
  body.product-page-mode #products .product-gallery{height:100%;max-height:none;min-height:0;overflow-y:auto;overscroll-behavior:contain}
}
/* 主图墙：每格内嵌左右箭头预览 */
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.gallery-item{position:relative;display:block;padding:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;cursor:zoom-in;transition:.22s}
.gallery-item:hover{transform:translateY(-3px);border-color:#1668d8;box-shadow:0 8px 22px rgba(18,86,201,.14)}
.gallery-image-stack{position:relative;display:block;width:100%;aspect-ratio:3/2;overflow:hidden;background:#eef3f8}
.gallery-item img{width:100%;height:100%;object-fit:cover;display:block;cursor:zoom-in}
.gallery-primary{position:relative;z-index:1;transition:transform .55s cubic-bezier(.2,.7,.2,1),opacity .35s ease}
.gallery-hover-image{position:absolute;inset:0;z-index:2;opacity:0;transform:scale(1.045);pointer-events:none;transition:opacity .42s ease,transform .58s cubic-bezier(.2,.7,.2,1)}
@media(hover:hover) and (pointer:fine){html[data-product-swap="on"] .gallery-item.has-hover-image:hover .gallery-primary{opacity:0;transform:scale(.985)}html[data-product-swap="on"] .gallery-item.has-hover-image:hover .gallery-hover-image{opacity:1;transform:scale(1)}}
/* 点击箭头后：强制显示切换后的子图，隐藏 hover 覆盖图（鼠标移开恢复） */
.gallery-item.arrow-active .gallery-primary{opacity:1!important;transform:none!important}
.gallery-item.arrow-active .gallery-hover-image{opacity:0!important;transform:scale(1.045)!important}
.gallery-item .gallery-count{position:absolute;right:8px;bottom:8px;display:grid;place-items:center;min-width:22px;height:22px;padding:0 6px;border-radius:11px;background:rgba(14,35,60,.65);color:#fff;font-size:9px;font-weight:700}
/* 格子内左右箭头：常显（半透明），hover 加深 */
.g-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:3;display:grid;width:20px;height:32px;place-items:center;border:0;border-radius:5px;background:rgba(14,35,60,.35);color:#fff;font-size:13px;line-height:1;cursor:pointer;transition:.15s}
.g-arrow:hover{background:rgba(18,86,201,.75)}
.g-arrow.prev{left:6px}
.g-arrow.next{right:6px}
/* 子图指示点 */
.g-ind{position:absolute;left:50%;bottom:8px;transform:translateX(-50%);display:flex;gap:5px;z-index:3;padding:4px 8px;border-radius:12px;background:rgba(14,35,60,.6)}
.g-ind i{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,.45)}
.g-ind i.on{background:#7fc0ff}
/* 空图占位 */
.gallery-item .gallery-ph{display:grid;place-items:center;width:100%;aspect-ratio:3/2;background:#eef3f8;color:#8ba0b4;font-size:11px}
@media(max-width:980px){.gallery-layout{grid-template-columns:1fr}.category-nav{position:static;width:100%;max-height:none;padding:4px 0}.category-nav .line-sidebar__list{flex-direction:row;flex-wrap:wrap;gap:6px 18px}.category-nav .line-sidebar__item::before{inset:-6px -10px}.product-gallery{max-height:none}.gallery-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.gallery-grid{grid-template-columns:1fr 1fr}}

/* ===== 看图器（Windows 看图器风格） ===== */
.viewer{position:fixed;inset:0;z-index:1200;display:flex;flex-direction:column;background:rgba(6,16,30,.92);opacity:0;visibility:hidden;transition:.22s}
.viewer.open{opacity:1;visibility:visible}
.viewer-top{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:rgba(10,24,42,.85);border-bottom:1px solid rgba(255,255,255,.1);color:#dce8f4;font-size:12px;user-select:none}
.viewer-top b{font-weight:600}
.viewer-close{display:grid;width:34px;height:34px;place-items:center;border:0;border-radius:6px;background:rgba(255,255,255,.08);color:#fff;font-size:20px;line-height:1;transition:.15s}
.viewer-close:hover{background:#d93a3a}
.viewer-stage{flex:1;min-height:0;display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative;padding:18px 76px}
.viewer-stage img{width:100%;height:100%;max-width:100%;max-height:100%;object-fit:contain;user-select:none;touch-action:none;-webkit-user-drag:none;transition:transform .18s ease;cursor:grab;position:relative}
.viewer-stage img.dragging,.viewer-stage img.pinching{cursor:grabbing;transition:none}
.viewer-subbar{display:flex;align-items:center;justify-content:center;gap:10px;padding:12px 16px;background:rgba(10,24,42,.85);border-top:1px solid rgba(255,255,255,.1);color:#dce8f4;font-size:12px}
.viewer-subbar span{color:#8fb0d3}
.viewer-subbar .sub-dot{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.25);display:inline-block;margin:0 3px}
.viewer-subbar .sub-dot.active{background:#7fc0ff}
/* 工具按钮 */
.viewer-tools{display:flex;gap:6px;margin-left:auto}
.viewer-tools button{display:grid;min-width:36px;height:32px;place-items:center;padding:0 10px;border:1px solid rgba(255,255,255,.18);border-radius:6px;background:rgba(255,255,255,.07);color:#e8f1fa;font-size:13px;transition:.15s}
.viewer-tools button:hover{background:rgba(255,255,255,.16)}
.viewer-tools button.active{background:#1668d8;border-color:#1668d8}
.viewer-tools button svg{width:15px;height:15px;fill:currentColor}
/* 左右箭头 */
.viewer-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:5;display:grid;width:48px;height:72px;place-items:center;border:0;border-radius:8px;background:rgba(255,255,255,.08);color:#fff;font-size:30px;transition:.15s}
.viewer-arrow:hover{background:rgba(255,255,255,.2)}
.viewer-arrow.prev{left:18px}
.viewer-arrow.next{right:18px}
.viewer-arrow:disabled{opacity:.25;cursor:default}
.viewer-arrow:disabled:hover{background:rgba(255,255,255,.08)}
@media(max-width:760px){.viewer-stage{padding:8px}.viewer-arrow{width:40px;height:60px}.viewer-tools button{min-width:32px;padding:0 8px}}