:root{
  --bg:#0f1419; --panel:#161d26; --panel2:#1d2733; --line:#2a3543;
  --orange:#f26522; --orange-d:#d4531a; --teal:#19b3a6;
  --txt:#e8edf2; --muted:#9fb0c0; --faint:#6b7d8f;
  --good:#39b86a; --yell:#f2b417;
  --maxw:1200px; --r:12px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--txt); line-height:1.55; -webkit-font-smoothing:antialiased;
}
/* RTL: 阿拉伯语等从右到左语言，使用逻辑属性自动翻转 */
a{color:var(--teal); text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%; display:block}
.wrap{max-width:var(--maxw); margin:0 auto; padding-inline:20px}
.muted{color:var(--muted)}
.faint{color:var(--faint)}
.center{text-align:center}

/* ---------- Header ---------- */
header.site{position:sticky; top:0; z-index:50; background:rgba(15,20,25,.92);
  backdrop-filter:blur(8px); border-bottom:1px solid var(--line)}
.nav{display:flex; align-items:center; gap:18px; height:64px}
.brand{display:flex; align-items:center; gap:10px; font-weight:800; font-size:18px; color:#fff; letter-spacing:.3px}
.brand .logo{width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg,var(--orange),var(--yell));
  display:grid;place-items:center;color:#111;font-weight:900;font-size:15px;flex-shrink:0}
.brand .cn{color:var(--orange); font-size:13px; font-weight:600}
.nav .links{margin-inline-start:auto; display:flex; gap:6px; align-items:center}
.nav .links a{padding:8px 12px; border-radius:8px; color:var(--txt); font-weight:600; font-size:14px}
.nav .links a:hover{background:var(--panel2); text-decoration:none}
.lang{margin-inline-start:8px; display:flex; gap:4px}
.lang button{background:var(--panel2); border:1px solid var(--line); color:var(--muted);
  border-radius:6px; padding:5px 9px; font-size:12px; cursor:pointer}
.lang button.on{background:var(--orange); color:#111; border-color:var(--orange); font-weight:700}
.menu-btn{display:none}

/* ---------- Hero ---------- */
.hero{position:relative; padding:64px 0 48px; overflow:hidden}
.hero:after{content:""; position:absolute; inset:0; background:
  radial-gradient(900px 400px at 80% -10%, rgba(242,101,34,.18), transparent),
  radial-gradient(700px 400px at 0% 10%, rgba(25,179,166,.12), transparent); z-index:-1}
.hero h1{font-size:clamp(28px,4.4vw,52px); line-height:1.1; margin:0 0 14px; font-weight:800}
.hero h1 .hi{color:var(--orange)}
.hero p.lead{font-size:clamp(15px,1.7vw,20px); color:var(--muted); max-width:740px; margin:0 0 26px}
.cta-row{display:flex; gap:12px; flex-wrap:wrap}
.btn{display:inline-flex; align-items:center; gap:8px; padding:13px 22px; border-radius:10px;
  font-weight:700; font-size:15px; cursor:pointer; border:1px solid transparent}
.btn.primary{background:var(--orange); color:#111}
.btn.primary:hover{background:var(--orange-d); text-decoration:none}
.btn.ghost{background:transparent; border-color:var(--line); color:var(--txt)}
.btn.ghost:hover{background:var(--panel2); text-decoration:none}

/* ---------- Stats ---------- */
.stats{display:grid; grid-template-columns:repeat(4,1fr); gap:14px; margin-top:34px}
.stat{background:var(--panel); border:1px solid var(--line); border-radius:var(--r); padding:18px}
.stat b{display:block; font-size:26px; color:var(--orange)}
.stat span{color:var(--muted); font-size:13px}

/* ---------- Section ---------- */
section.block{padding:54px 0}
h2.sec{font-size:clamp(22px,3vw,32px); margin:0 0 6px; font-weight:800}
.sec-sub{color:var(--muted); margin:0 0 28px}

/* ---------- Category grid ---------- */
.cat-grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(220px,1fr)); gap:14px}
.cat-card{background:var(--panel); border:1px solid var(--line); border-radius:var(--r);
  padding:18px; transition:.15s; display:block; color:var(--txt)}
.cat-card:hover{border-color:var(--orange); transform:translateY(-2px); text-decoration:none}
.cat-card .n{font-size:17px; font-weight:700}
.cat-card .en{color:var(--teal); font-size:12px; letter-spacing:.5px; text-transform:uppercase; margin-bottom:6px}
.cat-card .c{color:var(--faint); font-size:13px; margin-top:8px}

/* ---------- Features ---------- */
.feat{display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:16px}
.feat .f{background:var(--panel); border:1px solid var(--line); border-radius:var(--r); padding:22px}
.feat .f .ic{width:42px;height:42px;border-radius:10px;display:grid;place-items:center;
  background:rgba(242,101,34,.15); color:var(--orange); font-size:20px; margin-bottom:12px}
.feat .f h3{margin:0 0 6px; font-size:17px}
.feat .f p{margin:0; color:var(--muted); font-size:14px}

/* ---------- Brands chips ---------- */
.chips{display:flex; flex-wrap:wrap; gap:10px; margin-top:8px}
.chip{background:var(--panel2); border:1px solid var(--line); color:var(--txt);
  padding:8px 14px; border-radius:999px; font-size:13px; font-weight:600}

/* ---------- Products page ---------- */
.layout{display:grid; grid-template-columns:260px 1fr; gap:24px; align-items:start}
.side{position:sticky; top:80px; background:var(--panel); border:1px solid var(--line);
  border-radius:var(--r); padding:16px; max-height:calc(100vh - 100px); overflow:auto}
.side h4{margin:14px 0 8px; font-size:13px; text-transform:uppercase; letter-spacing:.6px; color:var(--faint)}
.side .catlink{display:flex; justify-content:space-between; gap:8px; padding:7px 9px; border-radius:8px;
  color:var(--txt); cursor:pointer; font-size:14px}
.side .catlink:hover{background:var(--panel2)}
.side .catlink.on{background:var(--orange); color:#111; font-weight:700}
.side .catlink .ct{color:var(--faint); font-size:12px}
.side .catlink.on .ct{color:#222}
.brandfilter{display:flex; flex-wrap:wrap; gap:6px}
.brandfilter label{display:flex; align-items:center; gap:5px; background:var(--panel2);
  border:1px solid var(--line); padding:5px 9px; border-radius:8px; font-size:12px; cursor:pointer}
.toolbar{display:flex; gap:12px; align-items:center; margin-bottom:16px; flex-wrap:wrap}
.search{flex:1; min-width:220px; display:flex; align-items:center; gap:8px; background:var(--panel);
  border:1px solid var(--line); border-radius:10px; padding:10px 14px}
.search input{flex:1; background:transparent; border:0; outline:0; color:var(--txt); font-size:15px}
.count{color:var(--muted); font-size:14px}
.sort{background:var(--panel); border:1px solid var(--line); color:var(--txt); border-radius:10px; padding:10px 12px}

.pgrid{display:grid; grid-template-columns:repeat(auto-fill,minmax(180px,1fr)); gap:16px}
.pcard{background:var(--panel); border:1px solid var(--line); border-radius:var(--r); overflow:hidden;
  cursor:pointer; transition:.15s; display:flex; flex-direction:column; color:var(--txt)}
.pcard:hover{border-color:var(--orange); transform:translateY(-2px); text-decoration:none}
.pcard .ph{aspect-ratio:1/1; background:#0b0f14; display:grid; place-items:center; overflow:hidden}
.pcard .ph img{width:100%; height:100%; object-fit:contain}
.pcard .pb{padding:12px}
.pcard .code{font-weight:800; color:var(--orange); font-size:13px; letter-spacing:.3px}
.pcard .nm{font-size:13px; color:var(--txt); margin:4px 0; min-height:34px; display:-webkit-box;
  -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden}
.pcard .br{font-size:11px; color:var(--teal); font-weight:700; margin:2px 0; letter-spacing:.3px}
.pcard .md{font-size:11px; color:var(--faint); min-height:15px}

/* ---------- Pager ---------- */
.pager{display:flex; gap:6px; justify-content:center; align-items:center; margin:26px 0 6px; flex-wrap:wrap}
.pager button{background:var(--panel); border:1px solid var(--line); color:var(--txt);
  border-radius:8px; padding:8px 13px; font-size:13px; cursor:pointer; min-width:38px}
.pager button:hover:not(:disabled){border-color:var(--orange)}
.pager button.on{background:var(--orange); color:#111; font-weight:700; border-color:var(--orange)}
.pager button:disabled{opacity:.4; cursor:not-allowed}
.pager .dots{color:var(--faint); padding:0 4px}

/* ---------- Product detail ---------- */
.detail{display:grid; grid-template-columns:minmax(280px,420px) 1fr; gap:34px; align-items:start}
.gallery{background:#0b0f14; border:1px solid var(--line); border-radius:var(--r); padding:18px}
.gallery img{width:100%; object-fit:contain; max-height:480px; margin:0 auto}
.spec{background:var(--panel); border:1px solid var(--line); border-radius:var(--r); padding:6px 18px}
.spec .row{display:flex; gap:12px; padding:12px 0; border-bottom:1px solid var(--line); font-size:14px}
.spec .row:last-child{border-bottom:0}
.spec .k{color:var(--faint); min-width:120px; flex-shrink:0}
.models{display:flex; flex-wrap:wrap; gap:6px}
.models span{background:var(--panel2); border:1px solid var(--line); border-radius:6px; padding:3px 8px; font-size:12px}
.oem{font-family:ui-monospace,Consolas,monospace; font-size:13px; color:var(--yell)}

/* ---------- About / contact ---------- */
.about-grid{display:grid; grid-template-columns:1fr 1fr; gap:28px}
.prose p{color:var(--muted)}
.prose h3{margin-top:22px}
.kv{display:grid; gap:10px}
.kv .row{display:flex; gap:12px; align-items:center; background:var(--panel); border:1px solid var(--line);
  border-radius:10px; padding:14px 16px}
.kv .row .ic{width:38px;height:38px;border-radius:9px;background:rgba(25,179,166,.15);color:var(--teal);
  display:grid;place-items:center; font-size:18px; flex-shrink:0}
.kv .row b{display:block; font-size:14px}
.kv .row span{color:var(--muted); font-size:13px}
form.rfq{background:var(--panel); border:1px solid var(--line); border-radius:var(--r); padding:22px}
form.rfq label{display:block; font-size:13px; color:var(--muted); margin:12px 0 5px}
form.rfq input,form.rfq textarea,form.rfq select{width:100%; background:var(--bg); border:1px solid var(--line);
  color:var(--txt); border-radius:9px; padding:11px 12px; font-size:14px; font-family:inherit}
form.rfq textarea{min-height:110px; resize:vertical}
.grid2{display:grid; grid-template-columns:1fr 1fr; gap:14px}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(135deg,#1c2531,#10171f); border:1px solid var(--line);
  border-radius:16px; padding:34px; text-align:center; margin:20px 0}
.cta-band h2{margin:0 0 8px}

/* ---------- Footer ---------- */
footer.site{border-top:1px solid var(--line); margin-top:40px; padding:34px 0; color:var(--muted); font-size:13px}
footer .cols{display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:24px}
footer h5{color:var(--txt); margin:0 0 10px; font-size:14px}
footer a{color:var(--muted)}
footer .bottom{border-top:1px solid var(--line); margin-top:24px; padding-top:16px; text-align:center; color:var(--faint)}

/* ---------- RTL 微调 ---------- */
[dir="rtl"] .nav{direction:rtl}
[dir="rtl"] body{direction:rtl}
[dir="rtl"] .search{direction:rtl}

/* ---------- responsive ---------- */
@media(max-width:880px){
  .layout{grid-template-columns:1fr}
  .side{position:static; max-height:none}
  .detail{grid-template-columns:1fr}
  .about-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  footer .cols{grid-template-columns:1fr 1fr}
  .grid2{grid-template-columns:1fr}
  .nav .links{display:none}
  .menu-btn{display:inline-grid; margin-inline-start:auto}
  .nav.open .links{display:flex; position:absolute; top:64px; inset-inline-start:0; inset-inline-end:0; flex-direction:column;
    background:var(--panel); border-bottom:1px solid var(--line); padding:10px}
}