:root{
  --orange:#f36c21;--orange-2:#ff9148;--orange-soft:#fff3ea;
  --warm:#fbf8f5;--warm-2:#f3eee9;--white:#fff;
  --charcoal:#3d4147;--text:#545b64;--muted:#7e858d;
  --line:#e8dfd8;--shadow:0 16px 42px rgba(92,59,35,.08);
  --radius:22px;--shell:1220px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--warm);color:var(--charcoal);font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit}
.shell{width:min(var(--shell),92%);margin-inline:auto}
.skip-link{position:absolute;left:-9999px;top:8px;z-index:1000;background:var(--orange);color:#fff;padding:9px 14px;border-radius:8px}
.skip-link:focus{left:8px}
.site-header{position:sticky;top:0;z-index:90;background:rgba(255,253,251,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(243,108,33,.08)}
.header-inner{height:78px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:10px;min-width:210px}
.brand img{width:112px;height:auto}
.brand-company{font-weight:800;font-size:15px;line-height:1.2;color:var(--charcoal)}
.brand-company small{display:block;font-size:8px;letter-spacing:1.2px;color:#9a8270;margin-top:3px}
.primary-nav{margin-left:auto;display:flex;align-items:center;gap:21px}
.nav-link{font-size:13px;font-weight:700;position:relative;padding:28px 0;color:#595d62}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:20px;height:2px;background:var(--orange);transform:scaleX(0);transform-origin:left;transition:.2s}
.nav-link:hover,.nav-link.active{color:var(--orange)}
.nav-link:hover::after,.nav-link.active::after{transform:scaleX(1)}
.quote-btn,.btn-primary,.btn-outline{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;font-weight:800;transition:.2s}
.quote-btn{background:var(--orange);color:#fff;padding:11px 18px;font-size:13px;white-space:nowrap}
.quote-btn:hover,.btn-primary:hover{background:#db5c17;transform:translateY(-1px)}
.menu-toggle{display:none;border:0;background:transparent;font-size:26px;color:var(--charcoal)}
.btn-primary{background:var(--orange);color:#fff;padding:13px 22px}
.btn-outline{border:1px solid #e4c7b5;background:#fff;color:var(--orange);padding:12px 21px}
.btn-outline:hover{border-color:var(--orange);background:var(--orange-soft)}
.eyebrow{font-size:12px;color:var(--orange);font-weight:900;letter-spacing:1.6px;text-transform:uppercase}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(42px,5vw,70px);line-height:1.05;letter-spacing:-2px;margin-bottom:22px}
h2{font-size:clamp(30px,3vw,44px);line-height:1.12;letter-spacing:-1px}
h3{line-height:1.25}
.lead{font-size:18px;color:#656b72;line-height:1.9;max-width:760px}
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#fffaf6,#f7f0e9)}
.hero-grid{min-height:680px;display:grid;grid-template-columns:.92fr 1.08fr;gap:42px;align-items:center;padding:58px 0}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.hero-media{position:relative;min-height:530px}
.hero-media .main-img{position:absolute;inset:0 0 0 7%;width:93%;height:100%;object-fit:cover;border-radius:30px;box-shadow:var(--shadow)}
.hero-float{position:absolute;left:0;bottom:42px;width:43%;padding:18px;background:rgba(255,255,255,.96);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.hero-float b{font-size:19px}.hero-float p{font-size:12px;color:var(--muted);margin:5px 0 0}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:28px;max-width:610px}
.hero-stat{background:#fff;border:1px solid var(--line);padding:13px 14px;border-radius:14px}
.hero-stat b{display:block;color:var(--orange);font-size:20px}
.hero-stat span{font-size:11px;color:#7b716a}
.section{padding:86px 0}
.section.alt{background:var(--warm-2)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:32px}
.section-head>div:first-child{max-width:780px}
.section-head p{color:var(--muted);margin-bottom:0}
.text-link{color:var(--orange);font-weight:800;font-size:13px;white-space:nowrap}
.business-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.business-card{position:relative;min-height:350px;overflow:hidden;border-radius:24px;box-shadow:var(--shadow);background:#ddd}
.business-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.business-card::after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(61,65,71,.78),rgba(61,65,71,.06) 65%)}
.business-copy{position:absolute;left:22px;right:22px;bottom:22px;z-index:2;color:#fff}
.business-copy .k{font-size:11px;letter-spacing:1.3px;color:#ffe0cd}.business-copy h3{font-size:28px;margin:5px 0}.business-copy p{font-size:13px;margin:0;color:#f1eee9}
.cap-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:20px}
.cap-copy{background:#fff;border:1px solid var(--line);border-radius:24px;padding:38px;box-shadow:var(--shadow)}
.cap-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:25px}
.cap-item{border:1px solid var(--line);border-radius:16px;padding:17px;background:#fffaf7}
.cap-item b{display:block}.cap-item span{font-size:12px;color:var(--muted)}
.cap-images{display:grid;grid-template-rows:1fr 1fr;gap:16px}
.image-card{position:relative;overflow:hidden;border-radius:24px;min-height:220px}
.image-card img{width:100%;height:100%;object-fit:cover}
.image-card strong{position:absolute;left:20px;bottom:18px;color:#fff;font-size:20px;text-shadow:0 2px 10px rgba(61,65,71,.3)}
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.product-card{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:0 10px 25px rgba(88,56,32,.05);transition:.2s}
.product-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.product-card .product-image{aspect-ratio:1/1;background:#f4f1ee;overflow:hidden}
.product-card .product-image img{width:100%;height:100%;object-fit:cover}
.product-info{padding:16px}.product-info small{color:var(--orange);font-weight:900;font-size:10px}.product-info h3{font-size:17px;margin:5px 0 6px}.product-info p{font-size:12px;color:var(--muted);margin:0}
.application-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}
.application-card{position:relative;min-height:270px;border-radius:22px;overflow:hidden}
.application-card img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.application-card::after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(61,65,71,.76),transparent 65%)}
.application-card div{position:absolute;left:20px;bottom:18px;z-index:2;color:#fff}.application-card h3{margin:0 0 4px;font-size:23px}.application-card p{margin:0;font-size:12px}
.process{border-top:1px solid var(--line)}
.process-row{display:grid;grid-template-columns:80px .55fr 1.2fr;gap:20px;align-items:center;padding:20px 0;border-bottom:1px solid var(--line)}
.process-row .num{color:var(--orange);font-weight:900}.process-row b{font-size:18px}.process-row p{margin:0;color:var(--muted);font-size:13px}
.cta{background:linear-gradient(100deg,var(--orange),var(--orange-2));color:#fff;padding:58px 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:30px}.cta h2{margin-bottom:8px}.cta p{margin:0;color:#fff2e9}.cta .btn-outline{border-color:#fff;background:#fff;color:var(--orange)}
.breadcrumbs{font-size:12px;color:#8a817b;padding-top:17px;padding-bottom:17px}.breadcrumbs a:hover{color:var(--orange)}.breadcrumbs .sep{padding:0 8px;color:#b9afa8}
.subhero{background:#fffaf6}
.subhero-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:36px;align-items:center;min-height:480px;padding:48px 0}
.subhero-media{height:390px;border-radius:26px;overflow:hidden;box-shadow:var(--shadow)}
.subhero-media img{width:100%;height:100%;object-fit:cover}
.category-strip{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}
.category-chip{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 10px;text-align:center;font-size:12px;font-weight:800}.category-chip.active{color:var(--orange);border-color:#f7b68f;background:#fff8f3}
.finish-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.finish{border-radius:18px;min-height:150px;padding:20px;display:flex;align-items:end;border:1px solid var(--line)}
.finish:nth-child(1){background:linear-gradient(135deg,#fff,#d7d7d7)}
.finish:nth-child(2){background:linear-gradient(135deg,#f2f2f2,#bcbcbc)}
.finish:nth-child(3){background:linear-gradient(135deg,#706d69,#c5bdb5)}
.finish:nth-child(4){background:linear-gradient(135deg,#d8ab5c,#f2d28f)}
.finish b{font-size:18px}
.download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}
.download-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:25px;box-shadow:var(--shadow)}
.download-card .file-icon{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;background:var(--orange-soft);color:var(--orange);font-size:25px;font-weight:900}
.download-card h2{font-size:23px;margin:17px 0 8px}.download-card p{color:var(--muted);font-size:13px}
.contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:24px}
.contact-panel,.contact-form{background:#fff;border:1px solid var(--line);border-radius:24px;padding:30px;box-shadow:var(--shadow)}
.contact-panel h2,.contact-form h2{font-size:28px}
.contact-list{display:grid;gap:14px;margin-top:24px}.contact-list div{padding:14px;border:1px solid var(--line);border-radius:14px;background:#fffaf7}.contact-list b{display:block;font-size:12px;color:var(--orange)}.contact-list span{font-size:14px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.field{display:grid;gap:6px}.field.full{grid-column:1/-1}.field label{font-size:12px;font-weight:800}.field input,.field textarea,.field select{width:100%;border:1px solid #ddcec4;border-radius:12px;background:#fff;padding:12px 13px;color:var(--charcoal);outline:none}.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--orange);box-shadow:0 0 0 3px rgba(243,108,33,.08)}.field textarea{min-height:140px;resize:vertical}.form-note{font-size:12px;color:var(--muted)}
.detail-layout{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.detail-gallery{background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden}.detail-gallery img{width:100%;height:auto}
.detail-copy{padding-top:10px}.detail-copy h1{font-size:clamp(38px,4vw,58px)}.spec-list{display:grid;gap:10px;margin:24px 0}.spec{display:grid;grid-template-columns:120px 1fr;padding:12px 0;border-bottom:1px solid var(--line)}.spec b{font-size:12px;color:#8a817b}.spec span{font-size:14px}
.prose{max-width:850px}.prose p,.prose li{color:#626970}.prose h2{margin-top:36px;font-size:30px}
.site-footer{background:#5d6268;color:#f6f3f0;padding:48px 0 22px}
.footer-grid{display:grid;grid-template-columns:1.4fr .8fr .8fr 1fr;gap:30px}
.footer-brand img{width:130px;filter:brightness(0) invert(1);opacity:.95}.footer-tagline{font-size:16px;font-weight:800}.site-footer h2{font-size:15px;color:#fff}.site-footer a,.site-footer p{display:block;font-size:12px;color:#e2dfdc;margin:7px 0}.site-footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.18);margin-top:30px;padding-top:16px;display:flex;justify-content:space-between;gap:15px;font-size:11px;color:#dedbd8}
.empty-state{background:#fff;border:1px dashed #d5c6bc;border-radius:18px;padding:28px;color:#7b726c}
@media(max-width:1020px){
 .primary-nav{display:none;position:absolute;top:78px;left:0;right:0;background:#fff;padding:12px 4%;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0}
 .primary-nav.open{display:flex}.nav-link{padding:13px 0}.nav-link::after{display:none}.menu-toggle{display:block;margin-left:auto}.quote-btn{display:none}
 .hero-grid,.subhero-grid,.cap-grid,.contact-grid,.detail-layout{grid-template-columns:1fr}.hero-media{min-height:460px}.subhero-media{height:360px}
 .business-grid,.application-grid,.download-grid{grid-template-columns:1fr 1fr}.product-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1fr 1fr}
 .category-strip{grid-template-columns:repeat(3,1fr)}.finish-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:650px){
 .header-inner{height:68px}.site-header .brand img{width:90px}.brand-company{display:none}.primary-nav{top:68px}
 .hero-grid{min-height:auto;padding:50px 0}.hero-media{min-height:370px}.hero-media .main-img{left:0;width:100%}.hero-float{width:70%;bottom:20px}
 .hero-stats{grid-template-columns:1fr}.section{padding:62px 0}.section-head{align-items:flex-start;flex-direction:column}
 .business-grid,.application-grid,.download-grid,.product-grid,.cap-list,.footer-grid,.finish-grid{grid-template-columns:1fr}
 .category-strip{grid-template-columns:1fr 1fr}.process-row{grid-template-columns:50px 1fr}.process-row p{grid-column:2}
 .cta-inner,.footer-bottom{flex-direction:column;align-items:flex-start}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}
}

/* V2 bilingual + focused SEO + RFQ */
.lang-switch{display:inline-flex;align-items:center;justify-content:center;min-width:42px;height:36px;padding:0 10px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--orange);font-size:12px;font-weight:900;white-space:nowrap}
.lang-switch:hover{border-color:var(--orange);background:var(--orange-soft)}
.product-grid-3{grid-template-columns:repeat(3,1fr)}
.product-hero .detail-gallery{background:#f5f2ef}
.faq-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:0 18px;box-shadow:0 8px 20px rgba(88,56,32,.04)}.faq-item summary{cursor:pointer;font-weight:800;padding:17px 0;color:var(--charcoal)}.faq-item p{color:var(--muted);font-size:13px;padding-bottom:17px;margin:0}.seo-note{font-size:12px;color:#81766f;border-left:3px solid var(--orange);padding-left:12px;margin:18px 0}
.rfq-status{margin-top:12px;font-size:13px;font-weight:700;min-height:22px}.rfq-status.success{color:#25834a}.rfq-status.error{color:#b4422c}.honeypot{position:absolute!important;left:-10000px!important;width:1px!important;height:1px!important;overflow:hidden!important}.field input[type=file]{background:#fffaf7;border-style:dashed}.contact-form button[disabled]{opacity:.6;cursor:wait}
@media(max-width:1020px){.product-grid-3,.faq-grid{grid-template-columns:1fr 1fr}.lang-switch{margin-left:auto}.menu-toggle+.primary-nav + .lang-switch{margin-left:0}}
@media(max-width:650px){.product-grid-3,.faq-grid{grid-template-columns:1fr}.lang-switch{height:34px;min-width:38px;padding:0 8px}.header-inner{gap:10px}}


/* V4.3 Pro hero: rail transit primary visual + two separated material cards */
.hero-visual-pro{
  min-height:560px;
  display:grid;
  grid-template-columns:minmax(0,1.7fr) minmax(250px,.8fr);
  gap:18px;
}
.hero-rail-panel{
  position:relative;
  overflow:hidden;
  border-radius:30px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:var(--shadow);
  display:block;
  min-height:560px;
}
.hero-rail-panel::after{
  content:"";
  position:absolute; inset:0;
  background:linear-gradient(180deg,rgba(255,255,255,0) 52%,rgba(255,248,242,.94) 100%);
  pointer-events:none;
}
.hero-rail-panel img{
  width:100%; height:100%; object-fit:cover; display:block;
  transition:transform .45s ease;
}
.hero-rail-panel:hover img{transform:scale(1.02)}
.hero-rail-copy{
  position:absolute; z-index:2; left:24px; right:24px; bottom:22px;
}
.hero-rail-copy span,.hero-material-copy span{
  display:block; font-size:11px; letter-spacing:.14em; font-weight:700;
  color:var(--orange);
}
.hero-rail-copy strong{
  display:block; margin-top:5px; font-size:24px; color:var(--text);
}
.hero-rail-copy small{
  display:block; margin-top:7px; color:var(--muted); line-height:1.5;
}
.hero-material-cards{
  display:grid; grid-template-rows:1fr 1fr; gap:18px;
}
.hero-material-card{
  position:relative; display:grid; grid-template-rows:minmax(0,1fr) auto;
  overflow:hidden; border-radius:24px; background:#fff;
  border:1px solid var(--line); box-shadow:var(--shadow);
  min-height:0;
}
.hero-material-img{overflow:hidden; min-height:0}
.hero-material-img img{
  width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s ease;
}
.hero-material-card:hover .hero-material-img img{transform:scale(1.035)}
.hero-material-copy{
  padding:14px 16px 16px;
  background:linear-gradient(180deg,#fff,#fffaf6);
}
.hero-material-copy strong{
  display:block;margin-top:3px;font-size:17px;color:var(--text);
}
.hero-material-copy small{
  display:block;margin-top:4px;font-size:11px;line-height:1.4;color:var(--muted);
}
@media(max-width:980px){
  .hero-visual-pro{grid-template-columns:1fr;min-height:auto}
  .hero-rail-panel{min-height:430px}
  .hero-material-cards{grid-template-columns:1fr 1fr;grid-template-rows:none}
  .hero-material-card{min-height:300px}
}
@media(max-width:640px){
  .hero-rail-panel{min-height:340px}
  .hero-material-cards{grid-template-columns:1fr}
  .hero-material-card{min-height:260px}
}