/* QSO Battery - B2B industrial style */
:root{--blue:#0b5cad;--blue-d:#084a8a;--blue-l:#e8f2fb;--ink:#1a2733;--gray:#5b6b7b;--line:#e1e7ee;--bg:#f6f8fa;--green:#1fa838;--wa:#128c7e;--wa-d:#0d6e63;--radius:8px;--maxw:1240px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font:15px/1.65 "Segoe UI",system-ui,-apple-system,Arial,sans-serif;color:var(--ink);background:#fff}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 16px}
h1,h2,h3,h4{line-height:1.3;font-weight:700}
h2{font-size:24px;margin-bottom:16px}
.btn{display:inline-block;padding:10px 22px;border-radius:var(--radius);border:1px solid transparent;cursor:pointer;font-size:15px;font-weight:600;text-align:center}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d)}
.btn-wa{background:var(--wa);color:#fff;font-weight:700}
.btn-wa:hover{background:var(--wa-d)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-outline-light{background:transparent;border-color:rgba(255,255,255,.45);color:#fff}
.btn-outline-light:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-lg{padding:13px 28px;font-size:16px}
/* topbar/header */
.topbar{background:var(--ink);color:#c9d4de;font-size:12.5px}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;min-height:34px;flex-wrap:wrap;padding:4px 0;gap:4px}
.topbar-left{flex:1;min-width:300px;line-height:1.45}
.topbar-right a{color:#c9d4de;margin-left:16px}
.topbar-cta{color:#ffd76e!important;font-weight:600}
.header{border-bottom:2px solid var(--blue);background:#fff}
.header-inner{display:flex;align-items:center;gap:28px;height:68px}
.logo{display:flex;align-items:center;gap:10px}
.logo-img{height:40px;width:auto;display:block}
.logo-mark{background:var(--blue);color:#fff;font-weight:800;font-size:22px;padding:6px 10px;border-radius:6px;letter-spacing:1px}
.logo-text{font-weight:800;font-size:20px;color:var(--ink);line-height:1.05}
.logo-text small{display:block;font-size:10.5px;font-weight:500;color:var(--gray);letter-spacing:.5px}
.nav{display:flex;gap:4px;flex:1;flex-wrap:wrap}
.nav a{padding:8px 10px;color:var(--ink);font-weight:600;font-size:14px;border-radius:6px}
.nav a:hover{background:var(--blue-l);text-decoration:none}
.nav a.active{color:var(--blue)}
.header-cta{margin-left:auto}
/* breadcrumb */
.breadcrumb{padding:12px 0;font-size:13px;color:var(--gray)}
.breadcrumb a{color:var(--gray)}
/* product page */
.product-page{padding:8px 16px 40px}
.pd-main{display:grid;grid-template-columns:440px 1fr;gap:28px;margin-bottom:36px}
.pd-main-img img{width:100%;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.pd-thumbs{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.pd-thumbs img{width:60px;height:60px;object-fit:cover;border:2px solid transparent;border-radius:6px;cursor:pointer}
.pd-thumbs img.active,.pd-thumbs img:hover{border-color:var(--blue)}
.pd-title{font-size:21px;margin-bottom:10px}
.pd-stats{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.pd-stats span{background:var(--blue-l);color:var(--blue-d);border-radius:20px;padding:3px 12px;font-size:12.5px}
.pd-stats b{font-weight:700}
.pd-price-box{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.pd-price-row{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:12px}
.pd-price{font-size:30px;font-weight:800;color:var(--blue)}
.pd-price .unit{font-size:13px;color:var(--gray);font-weight:400}
.pd-price-range{font-size:14px;color:var(--gray)}
.ladder-table{width:100%;border-collapse:collapse;font-size:13px;margin-bottom:16px;background:#fff}
.ladder-table th,.ladder-table td{border:1px solid var(--line);padding:7px 10px;text-align:center}
.ladder-table thead th{background:var(--blue-l);color:var(--blue-d);font-weight:600}
.ladder-table td:first-child,.ladder-table th:first-child{text-align:left;background:#fff;color:var(--gray);font-weight:600}
/* SKU selector - Alibaba style */
.sku-selector{margin-bottom:16px}
.sku-attr{display:flex;gap:12px;margin-bottom:12px;align-items:flex-start}
.sku-attr-name{min-width:130px;color:var(--gray);font-size:13.5px;padding-top:7px}
.sku-values{display:flex;flex-wrap:wrap;gap:8px}
.sku-val{border:2px solid var(--line);background:#fff;border-radius:6px;padding:5px 14px;font-size:14px;cursor:pointer;color:var(--ink);min-width:40px}
.sku-val:hover{border-color:var(--blue)}
.sku-val.selected{border-color:var(--blue);color:var(--blue);background:var(--blue-l);font-weight:600}
.sku-val.disabled{color:#c3ccd5;background:#f7f9fb;border-style:dashed;cursor:not-allowed;opacity:.6}
.sku-val.sku-img{display:flex;align-items:center;gap:8px;padding:4px 10px 4px 4px}
.sku-val.sku-img img{border-radius:4px}
.sku-val.sku-img i{font-style:normal;font-size:13px}
.sku-status{font-size:13px;color:var(--blue-d);min-height:18px;font-weight:600}
.pd-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.pd-moq{font-size:13px;color:var(--gray)}
.pd-section{margin-bottom:44px}
.pd-h3{font-size:17px;margin:20px 0 10px}
.spec-table{width:100%;border-collapse:collapse;font-size:14px}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:9px 14px;text-align:left;vertical-align:top}
.spec-table th{background:var(--bg);width:220px;font-weight:600}
.pd-desc{margin-top:14px;color:#2c3a47}
.pd-desc p{margin-bottom:12px}
.pd-desc-img{margin:14px auto;max-width:900px;border-radius:6px}
/* FAQ */
.faq-item{border:1px solid var(--line);border-radius:var(--radius);margin-bottom:10px;background:#fff}
.faq-q{width:100%;text-align:left;background:#fff;border:0;padding:14px 18px;font-size:15px;font-weight:600;cursor:pointer;position:relative;padding-right:40px}
.faq-q:after{content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);font-size:20px;color:var(--blue)}
.faq-item.open .faq-q:after{content:"−"}
.faq-a{display:none;padding:0 18px 14px;color:var(--gray)}
.faq-item.open .faq-a{display:block}
/* trust strip */
.trust-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.trust-strip>div{background:var(--blue-l);border-radius:var(--radius);padding:16px;text-align:center}
.trust-strip b{display:block;color:var(--blue-d);margin-bottom:4px}
.trust-strip span{font-size:13px;color:var(--gray)}
/* cards / grids */
.grid{display:grid;gap:18px}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:box-shadow .15s,transform .15s}
.card:hover{box-shadow:0 8px 22px rgba(11,92,173,.13);transform:translateY(-2px);text-decoration:none}
.card img{width:100%;aspect-ratio:1;object-fit:cover;background:#fff}
.card-body{padding:12px 14px}
.card-title{font-size:14px;color:var(--ink);height:40px;overflow:hidden;line-height:1.4}
.card-price{color:var(--blue);font-weight:700;margin-top:6px;font-size:15px}
.card-cat{font-size:12px;color:var(--gray)}
/* category page */
.cat-head{padding:26px 0 10px}
.cat-head h1{font-size:26px}
.cat-head p{color:var(--gray);margin-top:6px;max-width:820px}
.cat-banner{width:100%;max-width:1134px;border-radius:10px;margin:6px 0 22px;display:block}
.pagination{display:flex;gap:8px;justify-content:center;margin:36px 0;flex-wrap:wrap}
.pagination a,.pagination span{min-width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:6px;font-weight:600}
.pagination .cur{background:var(--blue);color:#fff;border-color:var(--blue)}
/* home */
.hero{background:var(--ink)}
.carousel{position:relative;overflow:hidden;background:#0f1722}
.carousel-track{display:flex;transition:transform .5s ease}
.carousel-slide{min-width:100%}
.carousel-slide img{width:100%;aspect-ratio:1920/649;object-fit:cover;display:block}
.carousel-arrow{position:absolute;top:50%;transform:translateY(-50%);background:rgba(15,23,34,.45);color:#fff;border:0;font-size:22px;padding:14px 12px;cursor:pointer;z-index:5;transition:background .15s}
.carousel-arrow:hover{background:rgba(15,23,34,.75)}
.carousel-arrow.prev{left:0;border-radius:0 6px 6px 0}
.carousel-arrow.next{right:0;border-radius:6px 0 0 6px}
.carousel-dots{position:absolute;bottom:12px;left:0;right:0;display:flex;justify-content:center;gap:8px;z-index:5}
.carousel-dots button{width:26px;height:4px;border:0;border-radius:2px;background:rgba(255,255,255,.4);cursor:pointer;padding:0}
.carousel-dots button.active{background:#ffd76e}
.hero-strip{display:flex;justify-content:space-between;align-items:center;gap:26px;padding:22px 16px;flex-wrap:wrap}
.hero-copy h1{font-size:26px;color:#fff;margin-bottom:10px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{display:flex;gap:26px;flex-wrap:wrap;justify-content:flex-end}
.hero-stats div b{display:block;font-size:26px;color:#ffd76e}
.hero-stats div span{font-size:12.5px;color:#c4d2df}
/* warehouse band */
.wh-band{padding:36px 0;background:#fff}
.wh-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:center}
.wh-img img{border-radius:10px;width:100%}
.wh-info h2{font-size:24px;margin-bottom:10px}
.wh-info p{color:var(--gray);margin-bottom:14px}
.wh-flags{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.wh-flags span{background:var(--blue-l);color:var(--blue-d);border-radius:20px;padding:5px 14px;font-size:13.5px;font-weight:600}
.home-section{padding:46px 0}
.home-section h2{text-align:center;margin-bottom:8px}
.home-sub{text-align:center;color:var(--gray);margin-bottom:30px}
.cat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.cat-tile{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 16px;text-align:center;transition:box-shadow .15s}
.cat-tile:hover{box-shadow:0 8px 22px rgba(11,92,173,.13);text-decoration:none}
.cat-tile .ico{font-size:30px}
.cat-tile b{display:block;margin:8px 0 4px;color:var(--ink);font-size:14.5px}
.cat-tile span{font-size:12.5px;color:var(--gray)}
.cert-strip{display:flex;gap:22px;flex-wrap:wrap;justify-content:center}
.cert-strip img{height:64px;border:1px solid var(--line);border-radius:6px;background:#fff;padding:6px}
/* factory */
.page-wrap{padding:20px 0 60px}
.page-wrap h1{font-size:28px;margin-bottom:18px}
.about-stats{display:flex;gap:26px;flex-wrap:wrap;background:var(--blue-l);border-radius:10px;padding:20px 26px;margin-bottom:22px}
.about-stats div b{display:block;font-size:28px;color:var(--blue-d)}
.about-stats div span{font-size:13px;color:var(--gray)}
.prose{max-width:900px;color:#2c3a47}
.prose p{margin-bottom:14px}
.factory-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:24px 0}
.factory-grid figure{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.factory-grid img{aspect-ratio:4/3;object-fit:cover;width:100%}
.factory-grid figcaption{padding:10px 12px;font-size:13.5px;font-weight:600;color:var(--gray)}
.cert-list .cert-item{display:grid;grid-template-columns:120px 1fr;gap:20px;border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:14px;background:#fff}
.cert-list img{border:1px solid var(--line);border-radius:6px;background:#fff}
.cert-item h3{font-size:16px;margin-bottom:6px}
.cert-item p{font-size:13.5px;color:var(--gray)}
.cert-item .cert-meta{font-size:12.5px;color:var(--gray);margin-top:6px}
/* inquiry */
.inquiry-section{background:var(--blue-l);padding:48px 0}
.inquiry-section h2{text-align:center}
.inquiry-tip{text-align:center;color:var(--gray);margin-bottom:22px}
.inquiry-form{max-width:860px;margin:0 auto;background:#fff;padding:26px;border-radius:10px;border:1px solid var(--line)}
.form-row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:12px}
.inquiry-form input,.inquiry-form textarea{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:6px;font:inherit;margin-bottom:12px}
.inquiry-form input:focus,.inquiry-form textarea:focus{outline:2px solid var(--blue-l);border-color:var(--blue)}
.hp-field{position:absolute;left:-9999px}
.form-msg{margin-top:10px;font-size:14px}
.form-msg.ok{color:var(--green)}
.form-msg.err{color:#c0392b}
/* footer */
.footer{background:var(--ink);color:#a9b7c4;margin-top:30px;font-size:13.5px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:34px;padding:44px 16px}
.footer h4{color:#fff;margin-bottom:12px;font-size:15px}
.footer ul{list-style:none}
.footer li{margin-bottom:8px}
.footer a{color:#a9b7c4}
.footer a:hover{color:#fff}
.footer-logo{color:#fff;font-weight:800;font-size:20px;margin-bottom:10px;letter-spacing:.5px}
.footer-badges{margin-top:12px;color:#7f919f;font-size:12.5px;letter-spacing:.5px}
.footer-bottom{border-top:1px solid #2c3a47;padding:14px 0;font-size:12.5px;color:#7f919f}
.wa-float{position:fixed;right:22px;bottom:22px;width:56px;height:56px;border-radius:50%;background:var(--wa);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;box-shadow:0 8px 24px rgba(18,140,126,.45);z-index:99}
.wa-float:hover{background:var(--wa-d);text-decoration:none}
/* language switcher (in main header) */
.lang-switch{position:relative;margin-left:6px}
.lang-switch summary{list-style:none;cursor:pointer;color:var(--blue);font-weight:700;font-size:13.5px;border:1px solid var(--line);border-radius:6px;padding:7px 12px;white-space:nowrap}
.lang-switch summary::-webkit-details-marker{display:none}
.lang-switch[open] summary{background:var(--blue-l);border-color:var(--blue)}
.lang-menu{position:absolute;right:0;top:120%;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 10px 30px rgba(0,0,0,.18);display:flex;flex-direction:column;min-width:150px;z-index:50;padding:6px 0}
.lang-menu a{color:var(--ink);padding:7px 16px;font-size:13px}
.lang-menu a:hover{background:var(--blue-l);text-decoration:none}
body.theme-d .lang-switch summary{color:#fff;border-color:#30363d;background:#21262d}
body.theme-c .header .lang-switch summary{border:none;box-shadow:0 1px 8px rgba(15,40,80,.12)}
/* RTL adjustments */
[dir="rtl"] .topbar-inner,[dir="rtl"] .header-inner,[dir="rtl"] .footer-grid{direction:rtl}
[dir="rtl"] .sku-attr{flex-direction:row-reverse;text-align:right}
[dir="rtl"] .pd-main{direction:rtl}
[dir="rtl"] .spec-table th,[dir="rtl"] .spec-table td{text-align:right}
[dir="rtl"] .breadcrumb{direction:rtl}
[dir="rtl"] .faq-q{text-align:right;padding-right:18px;padding-left:44px}
[dir="rtl"] .faq-q:after{right:auto;left:16px}
[dir="rtl"] .form-row{direction:rtl}
[dir="rtl"] .pd-price-row{direction:rtl}
[dir="rtl"] .pd-cta{direction:rtl}
[dir="rtl"] .container{text-align:right}
[dir="rtl"] .hero-inner{direction:rtl;text-align:right}
[dir="rtl"] .nav{direction:rtl}
/* responsive */
@media(max-width:1020px){.pd-main{grid-template-columns:1fr}.grid-4{grid-template-columns:repeat(3,1fr)}.cat-grid{grid-template-columns:repeat(3,1fr)}.factory-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1fr 1fr}.trust-strip{grid-template-columns:repeat(2,1fr)}.hero-inner{grid-template-columns:1fr}.form-row{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}.cat-grid{grid-template-columns:repeat(2,1fr)}.header-inner{flex-wrap:wrap;height:auto;padding:10px 0}.nav{order:3;width:100%}.sku-attr{flex-direction:column;gap:4px}.sku-attr-name{padding-top:0}.cert-list .cert-item{grid-template-columns:1fr}.form-row{grid-template-columns:1fr}}