/* ============================================================
   Multilingual site — components layered on style.css
   ============================================================ */

/* ---------- language select ---------- */
.lang-select{
  appearance:none;-webkit-appearance:none;
  border:1px solid var(--line);background:var(--white);border-radius:99px;
  padding:8px 30px 8px 13px;font:inherit;font-size:12.5px;font-weight:600;color:#41586D;
  cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%236B7C8D' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 11px center;transition:.16s;
}
.lang-select:hover{border-color:var(--steel);color:var(--ink)}
.lang-select:focus{outline:0;border-color:var(--steel);box-shadow:0 0 0 3px rgba(30,95,168,.12)}

/* ---------- section head ---------- */
.sec-head{max-width:none;display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:clamp(28px,3.4vw,44px)}
.sec-head .h2{margin:0}
.sec-head .lede{margin-top:12px}

/* ---------- product cards ---------- */
.prod-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(12px,1.6vw,18px)}
.prod{position:relative;display:flex;gap:16px;padding:clamp(18px,2.2vw,26px);background:var(--white);
  border:1px solid var(--line);border-radius:var(--r-md);transition:.2s;overflow:hidden}
.prod::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--steel);opacity:0;transition:.2s}
.prod:hover{border-color:rgba(30,95,168,.35);box-shadow:var(--shadow-md);transform:translateY(-2px)}
.prod:hover::before{opacity:1}
.prod .num{flex:none;width:34px;height:34px;border-radius:8px;background:rgba(30,95,168,.08);
  display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:12px;color:var(--steel);font-weight:600}
.prod h3{font-size:16px;margin-bottom:6px}
.prod p{font-size:13.5px;color:#5A6C7D;line-height:1.55}
.prod .hs{display:inline-block;margin-top:10px;font-family:var(--mono);font-size:10.5px;letter-spacing:.03em;
  color:var(--steel);background:rgba(30,95,168,.07);padding:3px 8px;border-radius:99px}

/* ---------- feature (why) ---------- */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.feature{background:var(--white);padding:clamp(20px,2.4vw,28px)}
.feature .n{font-family:var(--mono);font-size:11px;color:var(--accent);font-weight:700;letter-spacing:.08em}
.feature h3{font-size:15.5px;margin:10px 0 7px}
.feature p{font-size:13.5px;color:#5A6C7D}

/* ---------- equipment blocks ---------- */
.equip{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(14px,2vw,20px)}
.eq{background:var(--white);border:1px solid var(--line);border-radius:var(--r-md);padding:clamp(20px,2.4vw,28px)}
.eq h3{font-size:16px;margin-bottom:14px;display:flex;align-items:center;gap:10px}
.eq h3::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);flex:none}
.eq dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:8px 14px;font-size:13.5px}
.eq dt{color:#7A8A99;white-space:nowrap}
.eq dd{margin:0;font-family:var(--mono);font-size:12.8px;color:var(--ink)}
.eq p{font-size:13.5px;color:#5A6C7D}

/* ---------- link list ---------- */
.links{display:grid;gap:10px}
.links li{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:#3F5567}
.links svg{flex:none;width:16px;height:16px;color:var(--ok);margin-top:3px}

/* ---------- two column text ---------- */
.cols2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,4vw,56px)}

/* ---------- dark band ---------- */
.band{background:var(--navy);color:#fff}
.band .h2{color:#fff}
.band .lede{color:var(--mist)}
.stats-3{grid-template-columns:repeat(3,1fr);max-width:100%;border-color:var(--line-dark);background:var(--line-dark)}

/* ---------- brand mark ---------- */
.brand img{width:34px;height:34px;flex:none;border-radius:8px;display:block}
.footer .brand img{box-shadow:0 0 0 1px rgba(255,255,255,.22)}

/* ---------- photos ---------- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(10px,1.4vw,16px)}
.gallery figure,.shot{margin:0;position:relative;overflow:hidden;border-radius:var(--r-md);background:#0B1C2E}
.gallery img,.shot img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .55s ease}
.gallery figure{aspect-ratio:4/3}
.gallery figure:hover img,.shot:hover img{transform:scale(1.04)}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;padding:16px 18px;font-size:12.5px;font-weight:600;
  color:#fff;letter-spacing:.02em;background:linear-gradient(to top,rgba(6,16,26,.85),rgba(6,16,26,0))}
.shot-wide{aspect-ratio:21/9;border-radius:var(--r-md);overflow:hidden;position:relative}
.shot-wide img{width:100%;height:100%;object-fit:cover;display:block}
.shot-wide figcaption{position:absolute;left:0;right:0;bottom:0;padding:18px 22px;font-size:13px;font-weight:600;
  color:#fff;background:linear-gradient(to top,rgba(6,16,26,.85),rgba(6,16,26,0))}

@media (max-width:900px){
  .gallery{grid-template-columns:1fr 1fr}
  .gallery figure:first-child{grid-column:1 / -1}
  .shot-wide{aspect-ratio:16/9}
}
@media (max-width:600px){
  .gallery{grid-template-columns:1fr}
  .gallery figure:first-child{grid-column:auto}
}
/* ---------- WeChat QR ---------- */
.qr-block{display:flex;gap:18px;align-items:center;margin-top:16px;padding:16px;border:1px solid var(--line);
  border-radius:var(--r-md);background:var(--white)}
.qr-block img{width:190px;height:auto;display:block;border-radius:6px}
@media (max-width:600px){
  .qr-block{flex-direction:column;align-items:flex-start}
  .qr-block img{width:160px}
}

@media (max-width:1024px){
  .features{grid-template-columns:repeat(2,1fr)}
  .prod-grid,.equip,.cols2{grid-template-columns:1fr}
}
@media (max-width:900px){
  .header-actions .lang-select{max-width:96px}
  .features{grid-template-columns:1fr}
  .prod{flex-direction:row}
  .stats-3{grid-template-columns:1fr}
  .stat b{white-space:normal}
}


/* ===== BIW module ===== */
.video-band{padding-block:clamp(48px,6vw,88px)}
.video-frame{position:relative;margin-top:28px;border-radius:16px;overflow:hidden;box-shadow:0 24px 60px rgba(10,25,45,.35);background:#0b1a2b}
.video-frame video{display:block;width:100%;height:auto}
.video-badge{position:absolute;left:16px;top:14px;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:#cfe0f2;background:rgba(8,20,34,.55);padding:6px 10px;border-radius:999px;backdrop-filter:blur(6px)}
.biw-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin-top:28px}
.biw-card{border:1px solid var(--line,#dfe6ee);border-radius:14px;padding:20px;background:var(--white,#fff)}
.biw-card h3{margin:0 0 4px;font-size:15px}
.biw-card .k{font-size:24px;font-weight:700;color:var(--steel,#1E5FA8);letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.biw-card p{margin:8px 0 0;font-size:13px;color:#4A5C6E;line-height:1.6}
.biw-table-wrap{overflow-x:auto;margin-top:8px}
.biw-table{width:100%;border-collapse:collapse;font-size:14px;min-width:720px}
.biw-table th{text-align:left;font-size:11.5px;letter-spacing:.04em;color:#5b7086;border-bottom:2px solid var(--line,#dfe6ee);padding:10px 12px}
.biw-table td{border-bottom:1px solid var(--line,#dfe6ee);padding:11px 12px;vertical-align:top}
.biw-table tbody tr:nth-child(even) td{background:#f7f9fc}
.biw-table td.num{white-space:nowrap;font-variant-numeric:tabular-nums}
.biw-table tr.biw-sys td{background:#0E2237!important;color:#fff;font-weight:700;font-size:12.5px;letter-spacing:.06em;text-transform:uppercase}
@media (max-width:720px){.video-frame{border-radius:12px}.biw-card .k{font-size:20px}}