:root{
  --primary:#0b6fa4; --primary-dark:#085a86; --primary-light:#e8f3f9;
  --accent:#12a5b0; --text:#1d2b36; --muted:#5a6b78; --bg:#ffffff; --bg-alt:#f4f9fb;
  --border:#dce8ee; --radius:10px; --shadow:0 4px 18px rgba(8,90,134,.08);
  --container:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);line-height:1.7;font-size:16px;background:var(--bg)}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
ul{list-style:none}
.container{max-width:var(--container);margin:0 auto;padding:0 20px}
.center{text-align:center}
.small{font-size:.9rem;color:var(--muted)}

/* header */
.site-header{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 1px 0 var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:74px}
.brand img{height:48px;width:auto}
.nav{display:flex;align-items:center;gap:26px}
.nav ul{display:flex;gap:26px}
.nav a:not(.btn){color:var(--text);font-weight:600;padding:6px 0;position:relative}
.nav a:not(.btn):hover{text-decoration:none;color:var(--primary)}
.nav a[data-nav].active{color:var(--primary)}
.nav a[data-nav].active::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:3px;
  background:var(--primary);border-radius:2px}
.btn{display:inline-block;padding:10px 22px;border-radius:var(--radius);font-weight:600;border:2px solid transparent;
  cursor:pointer;transition:all .2s ease;font-size:.95rem}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);color:#fff}
.btn-outline{border-color:var(--primary);color:var(--primary);background:transparent}
.btn-outline:hover{background:var(--primary-light);color:var(--primary-dark)}
.btn-ghost{border-color:#fff;color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.15);color:#fff}
.btn-lg{padding:14px 34px;font-size:1.05rem}
.btn-block{display:block;text-align:center;margin-top:16px}
.btn-nav{background:var(--primary);color:#fff;padding:9px 18px}
.btn-nav:hover{background:var(--primary-dark);color:#fff}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:3px;background:var(--text);margin:5px 0;border-radius:2px;transition:.3s}

/* hero */
.hero{position:relative;min-height:560px;display:flex;align-items:center;color:#fff;overflow:hidden}
.hero-slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;
  transition:opacity 1.2s ease}
.hero-slide.active{opacity:1}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(100deg,rgba(6,50,74,.85) 0%,rgba(8,90,134,.55) 60%,rgba(8,90,134,.35) 100%)}
.hero-content{position:relative;z-index:2;max-width:760px;padding:60px 20px}
.hero-kicker{text-transform:uppercase;letter-spacing:2px;font-size:.85rem;color:#9fd3e8;margin-bottom:14px;font-weight:700}
.hero h1{font-size:clamp(1.8rem,4vw,3rem);line-height:1.25;margin-bottom:18px}
.hero-sub{font-size:1.05rem;color:#d8ecf5;margin-bottom:28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}

/* stats */
.stats{background:var(--primary);color:#fff;padding:26px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat strong{display:block;font-size:1.35rem}
.stat span{font-size:.9rem;color:#cfe8f2}

/* sections */
.section{padding:72px 0}
.section-alt{background:var(--bg-alt)}
.eyebrow{color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:1.5px;font-size:.85rem;margin-bottom:8px}
.section h2{font-size:clamp(1.5rem,3vw,2.1rem);margin-bottom:14px}
.section-lead{color:var(--muted);max-width:720px;margin-bottom:36px}
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.split p{margin-bottom:12px}
.img-frame img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%}

/* category cards */
.cat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin:30px 0 36px}
.cat-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);
  border:1px solid var(--border);transition:transform .2s;color:inherit}
.cat-card:hover{transform:translateY(-4px);text-decoration:none}
.cat-card img{width:100%;height:150px;object-fit:cover}
.cat-card-body{padding:14px}
.cat-card-body h3{font-size:1rem;margin-bottom:6px;color:var(--primary-dark)}
.cat-card-body p{font-size:.85rem;color:var(--muted)}

/* advantages */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:30px}
.adv-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.adv-card h3{color:var(--primary-dark);margin-bottom:10px;font-size:1.1rem}
.adv-card p{color:var(--muted);font-size:.95rem}

/* industries */
.industry-list{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
.industry-list li{background:#fff;border:1px solid var(--border);border-radius:999px;padding:9px 20px;
  font-weight:600;color:var(--primary-dark);box-shadow:var(--shadow)}
.section-alt .industry-list li{background:var(--primary-light)}

/* cta band */
.cta-band{background:linear-gradient(120deg,var(--primary) 0%,var(--accent) 100%);color:#fff}
.cta-band h2{color:#fff}
.cta-band p{max-width:640px;margin:0 auto 24px;color:#e2f2f8}

/* page hero */
.page-hero{background:linear-gradient(110deg,var(--primary-dark),var(--primary) 60%,var(--accent));color:#fff;padding:70px 0}
.page-hero h1{font-size:clamp(1.7rem,3.5vw,2.5rem);margin-bottom:8px}
.page-hero p{color:#d3eaf3;font-size:1.05rem}

/* breadcrumb */
.breadcrumb{padding:18px 20px;font-size:.9rem;color:var(--muted)}
.breadcrumb span{color:var(--text);font-weight:600}

/* products */
.cat-nav{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:44px}
.cat-nav a{background:var(--primary-light);color:var(--primary-dark);padding:8px 18px;border-radius:999px;font-weight:600;font-size:.9rem}
.cat-nav a:hover{background:var(--primary);color:#fff;text-decoration:none}
.product-group{margin-bottom:56px}
.product-group h2{border-left:5px solid var(--primary);padding-left:14px;margin-bottom:24px}
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.product-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:transform .2s}
.product-card:hover{transform:translateY(-4px)}
.product-card-link{color:inherit;display:block}
.product-card-link:hover{text-decoration:none}
.product-card img{width:100%;height:200px;object-fit:cover}
.product-card h3{font-size:1.02rem;padding:14px 16px 4px;color:var(--primary-dark)}
.product-card p{font-size:.85rem;color:var(--muted);padding:0 16px 10px}
.link-more{display:inline-block;padding:0 16px 16px;color:var(--primary);font-weight:600;font-size:.9rem}

/* product detail */
.pd-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:start}
.pd-image img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%}
.pd-info h1{font-size:clamp(1.6rem,3vw,2.2rem);margin-bottom:10px}
.pd-tagline{color:var(--muted);font-size:1.05rem;margin-bottom:18px}
.pd-info h2,.pd-desc h2{font-size:1.25rem;margin:22px 0 10px;color:var(--primary-dark)}
.check-list li{padding-left:30px;position:relative;margin-bottom:8px}
.check-list li::before{content:"✓";position:absolute;left:0;top:0;color:var(--accent);font-weight:800}
.dot-list li{padding-left:20px;position:relative;margin-bottom:6px}
.dot-list li::before{content:"";position:absolute;left:2px;top:12px;width:8px;height:8px;border-radius:50%;background:var(--primary)}
.pd-desc{max-width:900px}
.pd-desc p{margin-bottom:14px;color:#33424e}
.pd-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.rel-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:24px}
.rel-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);color:inherit;text-align:center}
.rel-card:hover{text-decoration:none;transform:translateY(-3px);transition:.2s}
.rel-card img{width:100%;height:130px;object-fit:cover}
.rel-card span{display:block;padding:12px;font-weight:600;color:var(--primary-dark);font-size:.95rem}

/* about */
.timeline{margin-top:28px;border-left:3px solid var(--primary);padding-left:0}
.timeline li{display:flex;gap:24px;padding:0 0 28px 24px;position:relative;list-style:none}
.timeline li::before{content:"";position:absolute;left:-9px;top:6px;width:15px;height:15px;border-radius:50%;
  background:#fff;border:3px solid var(--primary)}
.timeline time{font-weight:800;color:var(--primary);min-width:90px;font-size:1.05rem}
.timeline h3{font-size:1.05rem}
.timeline p{color:var(--muted);font-size:.95rem}
.gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:26px}
.gallery img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;object-fit:cover;aspect-ratio:3/2}
.video-frame{margin-top:24px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#000}
.video-frame video{width:100%;display:block;aspect-ratio:16/9}

/* contact */
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:52px;align-items:start}
.contact-card{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;margin-top:20px}
.contact-card h3{color:var(--primary-dark);font-size:1rem;margin-bottom:6px}
.contact-card p{color:var(--muted);font-size:.95rem}
.contact-form-wrap{background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:32px;box-shadow:var(--shadow)}
.contact-form .form-row{margin-bottom:16px}
.contact-form label{display:block;font-weight:600;margin-bottom:6px;font-size:.95rem}
.req{color:#d43f3f}
.contact-form input,.contact-form select,.contact-form textarea{width:100%;padding:11px 14px;
  border:1px solid var(--border);border-radius:8px;font:inherit;color:var(--text);background:#fbfdfe}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:2px solid var(--accent);border-color:var(--accent)}
.contact-form textarea{resize:vertical}
.hp{position:absolute;left:-9999px}
.form-status{margin-top:14px;font-weight:600;min-height:1.4em}
.form-status.ok{color:#1a7f37}
.form-status.err{color:#c0392b}

/* footer */
.site-footer{background:#0d2b3a;color:#b9cfda;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding:56px 20px 40px}
.site-footer h3{color:#fff;font-size:1.02rem;margin-bottom:14px}
.site-footer p,.site-footer a{color:#b9cfda;font-size:.92rem}
.site-footer a:hover{color:#fff}
.site-footer ul li{margin-bottom:8px}
.site-footer address{font-style:normal;font-size:.92rem;margin-bottom:14px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:18px 0;font-size:.88rem}
.footer-bottom a{color:#b9cfda}

/* responsive */
@media (max-width:1024px){
  .cat-grid{grid-template-columns:repeat(3,1fr)}
  .product-grid,.rel-grid{grid-template-columns:repeat(3,1fr)}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  .nav{position:fixed;top:74px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;
    padding:18px 22px 24px;box-shadow:0 8px 20px rgba(0,0,0,.12);transform:translateY(-140%);
    transition:transform .3s ease;z-index:99}
  .nav.open{transform:translateY(0)}
  .nav ul{flex-direction:column;gap:4px}
  .nav ul a:not(.btn){display:block;padding:12px 4px;font-size:1.05rem}
  .btn-nav{margin-top:12px;text-align:center}
  .nav-toggle{display:block}
  .nav-toggle.open span:nth-child(1){transform:translateY(8px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}
  .split,.contact-grid,.pd-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .product-grid,.rel-grid{grid-template-columns:repeat(2,1fr)}
  .section{padding:52px 0}
}
@media (max-width:540px){
  .product-grid,.rel-grid,.cat-grid,.adv-grid,.gallery,.footer-grid{grid-template-columns:1fr}
  .hero{min-height:480px}
  .contact-form-wrap{padding:22px}
  .timeline li{flex-direction:column;gap:4px}
}