:root{--navy:#123A6B;--navy-deep:#0d2b50;--gold:#F2B300;--gold-dk:#DBA200;
--ink:#12233d;--body:#3d4d63;--muted:#6b7c93;--line:#e2e8f0;--bg:#f6f8fb;}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
color:var(--body);background:#fff;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}

/* header */
.hd{background:var(--navy-deep);position:sticky;top:0;z-index:50;border-bottom:1px solid rgba(255,255,255,.08)}
.hd-in{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:20px;letter-spacing:.5px}
.logo svg{width:22px;height:22px}
.logo small{font-size:9px;font-weight:500;letter-spacing:2px;color:rgba(255,255,255,.5);margin-left:6px;display:none}
.nav{display:flex;gap:28px;align-items:center;font-size:14px;color:rgba(255,255,255,.82)}
.nav a:hover{color:var(--gold)}
.hd-cta{background:var(--gold);color:#12233d;padding:9px 20px;border-radius:5px;font-weight:600;font-size:13px}
.hd-cta:hover{background:var(--gold-dk)}
@media(max-width:860px){.nav{display:none}}

/* breadcrumb */
.bc{background:var(--bg);border-bottom:1px solid var(--line);font-size:13px;color:var(--muted);padding:12px 0}
.bc a:hover{color:var(--navy)}
.bc span{margin:0 7px;opacity:.5}

/* product */
.pd{padding:36px 0 60px}
.pd-top{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:start}
@media(max-width:900px){.pd-top{grid-template-columns:1fr;gap:28px}}
.gal-main{background:var(--bg);border:1px solid var(--line);border-radius:10px;overflow:hidden;aspect-ratio:1/1;
display:flex;align-items:center;justify-content:center}
.gal-main img{width:100%;height:100%;object-fit:contain;padding:18px}
.gal-thumbs{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.gal-thumbs button{width:66px;height:66px;border:1px solid var(--line);border-radius:6px;background:var(--bg);
cursor:pointer;overflow:hidden;padding:0}
.gal-thumbs button.on{border-color:var(--gold);box-shadow:0 0 0 2px rgba(242,179,0,.22)}
.gal-thumbs img{width:100%;height:100%;object-fit:contain;padding:4px}

h1{font-size:27px;line-height:1.3;color:var(--ink);font-weight:700;letter-spacing:-.3px}
.oem{margin-top:10px;font-size:13px;color:var(--muted)}
.oem b{color:var(--navy);font-weight:600}
.tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}
.tag{font-size:12px;padding:4px 10px;border-radius:4px;background:var(--bg);border:1px solid var(--line);color:var(--navy)}
.lead{margin-top:16px;font-size:15px;color:var(--body)}

.panel{margin-top:22px;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.panel h2{font-size:13px;font-weight:600;color:var(--navy);background:var(--bg);padding:11px 16px;
letter-spacing:.4px;border-bottom:1px solid var(--line);text-transform:uppercase}
.panel dl{display:grid;grid-template-columns:auto 1fr}
.panel dt,.panel dd{padding:9px 16px;font-size:13.5px;border-bottom:1px solid #f0f3f8}
.panel dt{color:var(--muted);font-weight:500;background:#fbfcfe;white-space:nowrap}
.panel dd{color:var(--ink);font-weight:500}
.panel dl>:nth-last-child(-n+2){border-bottom:none}

.cta{margin-top:22px;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 26px;border-radius:6px;font-size:14px;font-weight:600;transition:.18s}
.btn-gold{background:var(--gold);color:#12233d}
.btn-gold:hover{background:var(--gold-dk)}
.btn-line{border:1px solid var(--navy);color:var(--navy)}
.btn-line:hover{background:var(--navy);color:#fff}

/* sections */
.sec{padding:44px 0;border-top:1px solid var(--line)}
.sec:nth-of-type(even){background:var(--bg)}
.sec h2{font-size:19px;color:var(--ink);margin-bottom:18px;font-weight:700}
.sec p{font-size:15px;max-width:820px}
.cols{display:grid;grid-template-columns:1fr 1fr;gap:10px 34px;max-width:900px}
@media(max-width:700px){.cols{grid-template-columns:1fr}}
.cols li{list-style:none;position:relative;padding-left:22px;font-size:14.5px;margin-bottom:9px}
.cols li:before{content:"";position:absolute;left:0;top:9px;width:7px;height:7px;background:var(--gold);border-radius:2px}

table.spec{width:100%;border-collapse:collapse;font-size:14px;max-width:760px}
table.spec th,table.spec td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line)}
table.spec th{width:44%;color:var(--muted);font-weight:500;background:#fbfcfe}
table.spec td{color:var(--ink);font-weight:500}

/* cards */
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
@media(max-width:1000px){.grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:760px){.grid{grid-template-columns:repeat(2,1fr)}}
.card{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;transition:.18s;
display:flex;flex-direction:column}
.card:hover{border-color:var(--gold);box-shadow:0 6px 22px rgba(18,35,61,.08);transform:translateY(-2px)}
.card-img{background:var(--bg);aspect-ratio:1/1;display:flex;align-items:center;justify-content:center;padding:12px}
.card-img img{width:100%;height:100%;object-fit:contain}
.card-body{padding:13px 14px 16px}
.card-body h3{font-size:13.5px;line-height:1.45;color:var(--ink);font-weight:600;
display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:39px}
.card-body .oe{font-size:12px;color:var(--muted);margin-top:6px}

/* category header */
.cat-hd{background:linear-gradient(150deg,var(--navy-deep),var(--navy));color:#fff;padding:46px 0 42px}
.cat-hd h1{color:#fff;font-size:30px}
.cat-hd p{color:rgba(255,255,255,.72);margin-top:10px;font-size:14.5px;max-width:640px}
.cat-hd .n{display:inline-block;margin-top:16px;font-size:12px;letter-spacing:.6px;
color:var(--gold);border:1px solid rgba(242,179,0,.4);padding:5px 12px;border-radius:20px}

/* placeholder for images being replaced */
.ph{width:100%;aspect-ratio:1/1;background:linear-gradient(160deg,#f7f9fc,#eef2f7);
border:1px solid var(--line);border-radius:10px;display:flex;flex-direction:column;
align-items:center;justify-content:center;gap:8px;text-align:center;padding:20px}
.ph svg{width:26px;height:26px;opacity:.55}
.ph b{font-size:14px;color:var(--navy);font-weight:700;letter-spacing:.3px}
.ph span{font-size:11.5px;color:var(--muted);letter-spacing:.4px}
.ph-lg{border-radius:10px}
.ph-lg svg{width:38px;height:38px}
.ph-lg b{font-size:19px}
.ph-lg span{font-size:13px}
.card .ph{border:none;border-radius:0}

/* footer */
.ft{background:var(--navy-deep);color:rgba(255,255,255,.66);padding:44px 0 26px;font-size:13.5px;margin-top:0}
.ft-in{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px}
@media(max-width:760px){.ft-in{grid-template-columns:1fr}}
.ft h4{color:#fff;font-size:14px;margin-bottom:12px}
.ft a:hover{color:var(--gold)}
.ft-bot{border-top:1px solid rgba(255,255,255,.1);margin-top:30px;padding-top:18px;
display:flex;justify-content:space-between;font-size:12px;color:rgba(255,255,255,.42);flex-wrap:wrap;gap:8px}


/* article */
.art{padding:40px 0 56px}
.art .meta{font-size:13px;color:var(--muted);margin-bottom:8px}
.art h1{font-size:29px;max-width:840px;margin-bottom:20px}
.article-body{max-width:800px;font-size:15.5px;line-height:1.8}
.article-body h2{font-size:19px;color:var(--ink);margin:30px 0 12px}
.article-body h3{font-size:16px;color:var(--ink);margin:24px 0 10px}
.article-body p{margin-bottom:15px}
.article-body ul,.article-body ol{margin:0 0 16px 22px}
.article-body li{margin-bottom:7px}
.article-body img{border-radius:8px;margin:18px 0;max-width:100%}
.article-body table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px}
.article-body th,.article-body td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.article-body a{color:var(--navy);text-decoration:underline}
.art-cta{margin-top:34px;padding:22px 24px;border:1px solid var(--line);border-radius:10px;background:var(--bg)}
.art-cta p{font-size:14px;margin-bottom:14px}
/* news list */
.nlist{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:900px){.nlist{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.nlist{grid-template-columns:1fr}}
.nitem{border:1px solid var(--line);border-radius:10px;padding:18px 20px;transition:.18s;display:block}
.nitem:hover{border-color:var(--gold);box-shadow:0 6px 20px rgba(18,35,61,.07);transform:translateY(-2px)}
.nitem .d{font-size:12px;color:var(--muted);margin-bottom:8px}
.nitem h3{font-size:15px;color:var(--ink);line-height:1.45;font-weight:600;margin-bottom:8px}
.nitem p{font-size:13px;color:var(--muted);line-height:1.6;display:-webkit-box;
-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}


/* ===== 官方 logo + 移动端汉堡菜单 ===== */
.hd-logo{display:block;height:32px;width:auto}
.mnav-chk{position:absolute;opacity:0;pointer-events:none;width:0;height:0}
.mnav-btn{display:none}
@media (max-width:860px){
  .hd-in{position:relative;justify-content:flex-start}
  .hd-logo{height:26px}
  .hd-cta{order:2;margin-left:auto;margin-right:12px;padding:8px 14px;font-size:12.5px}
  .mnav-btn{display:flex;flex-direction:column;justify-content:space-between;
    width:24px;height:18px;padding:13px 10px;margin:-13px -10px;
    cursor:pointer;flex:none;order:3;box-sizing:content-box;-webkit-tap-highlight-color:transparent}
  .mnav-btn i{display:block;width:100%;height:2px;background:#fff;border-radius:2px;
    transition:transform .22s,opacity .18s}
  .mnav-chk:checked ~ .mnav-btn i:nth-child(1){transform:translateY(8px) rotate(45deg)}
  .mnav-chk:checked ~ .mnav-btn i:nth-child(2){opacity:0}
  .mnav-chk:checked ~ .mnav-btn i:nth-child(3){transform:translateY(-8px) rotate(-45deg)}
  .nav{display:none;position:absolute;left:0;right:0;top:68px;overflow-x:hidden;
    background:var(--navy-deep);flex-direction:column;gap:0;padding:4px 0 8px;
    border-bottom:1px solid rgba(255,255,255,.12);
    box-shadow:0 14px 28px rgba(4,14,30,.35);z-index:49}
  .mnav-chk:checked ~ .nav{display:flex}
  .nav{align-items:stretch}
  .nav a{display:flex;align-items:center;width:100%;box-sizing:border-box;
    padding:14px 24px;font-size:15px;border-bottom:1px solid rgba(255,255,255,.07)}
  .nav a:last-of-type{border-bottom:none}
}

/* 占位卡 logo：需压过 .card-img img{width:100%} */
.ph img.ph-mark{width:26px;height:26px;max-width:26px;max-height:26px;
  opacity:.8;object-fit:contain;display:block}
.ph.ph-lg img.ph-mark{width:38px;height:38px;max-width:38px;max-height:38px}