:root{
  --tech-gray:#3F4A57;
  --tech-gray-2:#54637a;
  --tech-gray-3:#7c8aa0;
  --ink:#1f2730;
  --bg:#f5f7f9;
  --card:#ffffff;
  --line:#e3e8ee;
  --laser:#e63329;
  --laser-soft:#ff5a4d;
  --ok:#2e7d52;
  --shadow:0 8px 28px rgba(31,39,48,.08);
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:"Segoe UI",-apple-system,"PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;
}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.container{max-width:1180px;margin:0 auto;padding:0 22px;}
.btn{
  display:inline-block;padding:13px 26px;border-radius:8px;font-weight:600;font-size:15px;
  transition:.2s;cursor:pointer;border:2px solid transparent;
}
.btn-primary{background:var(--laser);color:#fff;}
.btn-primary:hover{background:#c5281f;transform:translateY(-2px);}
.btn-ghost{border-color:var(--tech-gray);color:var(--tech-gray);}
.btn-ghost:hover{background:var(--tech-gray);color:#fff;}

/* Header */
header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;}
.logo{display:inline-flex;align-items:center;line-height:0;flex:0 0 auto;margin-right:42px;}
.logo-img{display:block;width:170px;height:auto;max-height:42px;object-fit:contain;object-position:left center;}
.logo-img.logo-light{width:190px;max-height:48px;}
.nav-links{display:flex;gap:26px;align-items:center;justify-content:flex-end;flex:1;}
.nav-links a{font-size:15px;color:var(--tech-gray-2);font-weight:500;transition:.2s;}
.nav-links a:hover{color:var(--laser);}
.language-picker{display:flex;align-items:center;gap:8px;flex:0 0 auto;margin-left:22px;color:var(--tech-gray-2);font-size:12px;font-weight:700;letter-spacing:.4px;white-space:nowrap;}
.language-select{padding:7px 28px 7px 10px;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--tech-gray);font:500 13px inherit;cursor:pointer;}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;}
.hamburger span{width:25px;height:3px;background:var(--tech-gray);border-radius:2px;}

/* Hero */
.hero{
  background:linear-gradient(135deg,#2b333d 0%,var(--tech-gray) 55%,var(--tech-gray-2) 100%);
  color:#fff;position:relative;overflow:hidden;padding:90px 0 100px;
}
.hero::before{
  content:"";position:absolute;top:-40%;right:-10%;width:620px;height:620px;border-radius:50%;
  background:radial-gradient(circle,rgba(230,51,41,.35),transparent 62%);
}
.hero::after{
  content:"";position:absolute;top:30%;left:-6%;width:240px;height:240px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.10),transparent 60%);
}
.hero .container{position:relative;z-index:2;}
.hero h1{font-size:46px;line-height:1.15;font-weight:800;margin-bottom:18px;letter-spacing:.5px;}
.hero h1 .hl{color:var(--laser-soft);}
.hero p{font-size:18px;opacity:.9;max-width:620px;margin-bottom:32px;}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap;}
.hero-stats{display:flex;gap:42px;margin-top:54px;flex-wrap:wrap;}
.hero-stats .s{position:relative;}
.hero-stats .n{font-size:30px;font-weight:800;}
.hero-stats .l{font-size:13px;opacity:.8;letter-spacing:.5px;}

/* Section */
.section{padding:78px 0;}
.section.alt{background:#eef1f5;}
.sec-head{text-align:center;max-width:720px;margin:0 auto 50px;}
.sec-head .eyebrow{color:var(--laser);font-weight:700;letter-spacing:3px;font-size:13px;text-transform:uppercase;}
.sec-head h2{font-size:34px;color:var(--tech-gray);margin:10px 0 14px;}
.sec-head p{color:var(--tech-gray-3);font-size:16px;}

/* Product grid */
.prod-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px;}
.prod-card{
  background:var(--card);border:1px solid var(--line);border-radius:14px;padding:30px;
  box-shadow:var(--shadow);transition:.25s;position:relative;overflow:hidden;
}
.prod-card:hover{transform:translateY(-6px);border-color:var(--tech-gray-3);}
.prod-card .ico{
  width:100%;height:168px;border-radius:12px;background:#f1f3f6;display:flex;
  align-items:center;justify-content:center;margin-bottom:18px;color:var(--laser);overflow:hidden;
}
.prod-card .ico img{width:100%;height:100%;object-fit:cover;display:block;}
.product-hero-image{width:100%;max-height:380px;object-fit:cover;border-radius:14px;margin-top:28px;box-shadow:var(--shadow);}
.prod-card h3{font-size:20px;color:var(--tech-gray);margin-bottom:8px;}
.prod-card .sub{color:var(--tech-gray-3);font-size:14px;margin-bottom:14px;font-weight:600;letter-spacing:.5px;}
.prod-card p{font-size:14.5px;color:#54606e;margin-bottom:18px;}
.prod-card ul{list-style:none;margin-bottom:20px;}
.prod-card li{font-size:14px;color:#44505e;padding-left:20px;position:relative;margin:6px 0;}
.prod-card li::before{content:"";position:absolute;left:0;top:9px;width:7px;height:7px;border-radius:50%;background:var(--laser);}
.prod-card .more{font-weight:700;color:var(--laser);font-size:14px;}

/* Why us */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.feat{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:26px;box-shadow:var(--shadow);}
.feat .ic{font-size:26px;margin-bottom:12px;}
.feat h4{color:var(--tech-gray);font-size:17px;margin-bottom:8px;}
.feat p{font-size:14px;color:#54606e;}

/* CTA band */
.cta-band{
  background:linear-gradient(120deg,var(--tech-gray),var(--tech-gray-2));
  color:#fff;border-radius:16px;padding:46px 44px;text-align:center;position:relative;overflow:hidden;
}
.cta-band h2{font-size:28px;margin-bottom:12px;}
.cta-band p{opacity:.88;margin-bottom:24px;}

/* Product detail page */
.page-hero{background:linear-gradient(135deg,var(--tech-gray),var(--tech-gray-2));color:#fff;padding:64px 0 70px;}
.page-hero .eyebrow{color:var(--laser-soft);letter-spacing:3px;font-size:13px;font-weight:700;text-transform:uppercase;}
.page-hero h1{font-size:40px;margin:10px 0 14px;}
.page-hero p{opacity:.9;max-width:680px;font-size:17px;}
.detail-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:start;}
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px;margin-top:8px;}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:12px 14px;text-align:left;}
.spec-table th{background:#eef1f5;color:var(--tech-gray);width:42%;}
.app-box{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px;box-shadow:var(--shadow);}
.app-box h4{color:var(--tech-gray);margin-bottom:12px;}
.app-box li{font-size:14px;color:#44505e;margin:7px 0;list-style:square;margin-left:18px;}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;}
.form-field{margin-bottom:18px;}
.form-field label{display:block;font-size:14px;font-weight:600;color:var(--tech-gray);margin-bottom:7px;}
.form-field input,.form-field select,.form-field textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:8px;font-size:15px;
  font-family:inherit;background:#fff;transition:.2s;
}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{outline:none;border-color:var(--laser);box-shadow:0 0 0 3px rgba(230,51,41,.12);}
.form-field textarea{resize:vertical;min-height:120px;}
.form-note{font-size:13px;color:var(--tech-gray-3);margin-top:6px;}
.info-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:30px;box-shadow:var(--shadow);}
.info-card h3{color:var(--tech-gray);margin-bottom:16px;}
.info-row{display:flex;gap:12px;margin-bottom:14px;font-size:14.5px;color:#44505e;}
.info-row .lab{color:var(--tech-gray-3);min-width:78px;font-weight:600;}
.form-success{display:none;background:#e6f4ec;color:var(--ok);border:1px solid #b6dcc4;padding:14px 18px;border-radius:8px;margin-top:14px;font-weight:600;}

/* Footer */
footer{background:#222a32;color:#c3ccd6;padding:54px 0 28px;}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:34px;}
.foot-grid h5{color:#fff;font-size:15px;margin-bottom:16px;letter-spacing:.5px;}
.foot-grid a{display:block;color:#aab4c0;font-size:14px;margin:8px 0;transition:.2s;}
.foot-grid a:hover{color:var(--laser-soft);}
.foot-about p{font-size:14px;color:#9aa6b2;margin:14px 0;}
.foot-bottom{border-top:1px solid #333d47;margin-top:36px;padding-top:20px;font-size:13px;color:#7e8a96;text-align:center;}

/* Responsive */
@media(max-width:900px){
  .prod-grid,.feat-grid,.detail-grid,.contact-grid,.foot-grid{grid-template-columns:1fr;}
  .hero h1{font-size:34px;}
  .nav-links{
    position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;gap:0;
    border-bottom:1px solid var(--line);max-height:0;overflow:hidden;transition:.3s;
  }
  .nav-links.open{max-height:340px;}
  .nav-links a{padding:14px 22px;width:100%;border-top:1px solid var(--line);}
  .hamburger{display:flex;}
  .logo{margin-right:18px;}
  .language-picker{margin-left:12px;gap:5px;font-size:11px;}
  .nav-links{flex:initial;}
  .hero-stats{gap:28px;}
}

/* News */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.news-card{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow);transition:.25s;display:block;}
.news-card:hover{transform:translateY(-5px);border-color:var(--tech-gray-3);}
.news-card .img{width:100%;height:180px;object-fit:cover;display:block;}
.news-card .body{padding:20px 22px;}
.news-card .date{font-size:12px;color:var(--tech-gray-3);letter-spacing:.5px;}
.news-card h3{font-size:17px;color:var(--tech-gray);margin:8px 0 10px;line-height:1.4;}
.news-card p{font-size:14px;color:#54606e;line-height:1.6;}
.news-content{font-size:16px;color:#44505e;line-height:1.9;}
.news-content p{margin-bottom:16px;}

/* News tabs & tags */
.news-tabs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px;}
.news-tabs a{display:inline-block;padding:8px 18px;border-radius:22px;background:#fff;border:1px solid var(--line);color:var(--tech-gray-2);font-size:14px;font-weight:600;transition:.2s;}
.news-tabs a:hover{border-color:var(--laser);color:var(--laser);}
.news-tabs a.active{background:var(--laser);border-color:var(--laser);color:#fff;}
.news-tag{display:inline-block;font-size:11px;font-weight:700;color:var(--laser);background:rgba(230,51,41,.08);padding:2px 10px;border-radius:12px;letter-spacing:.3px;}

/* Video embed (16:9) */
.video-wrap{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:12px;box-shadow:var(--shadow);}
.video-wrap iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0;}

/* Banner carousel */
.hero-banner{padding:0;background:#2b333d;}
.banner-slider{position:relative;height:520px;overflow:hidden;}
.banner-slide{position:absolute;top:0;left:0;width:100%;height:100%;background-size:cover;background-position:center;opacity:0;transition:opacity .8s;}
.banner-slide.active{opacity:1;}
.banner-content{position:absolute;left:0;right:0;top:0;bottom:0;display:flex;align-items:flex-end;z-index:2;background:linear-gradient(to top,rgba(20,26,33,.55),rgba(20,26,33,0) 62%);}
.banner-content h1{color:#fff;font-size:42px;font-weight:800;margin-bottom:40px;max-width:720px;text-shadow:0 2px 12px rgba(0,0,0,.45);}
.banner-dots{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:4;}
.banner-dots .dot{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.45);cursor:pointer;transition:.2s;}
.banner-dots .dot.active{background:var(--laser);}
@media(max-width:900px){
  .banner-slider{height:320px;}
  .banner-content h1{font-size:26px;margin-bottom:24px;}
}
@media(max-width:900px){
  .news-grid{grid-template-columns:1fr;}
}