:root{
  --blue:#1a3c6e; --blue2:#2d5fa8; --gold:#c9912b; --bg:#f5f7fa; --ink:#222; --muted:#666; --line:#e3e8ef;
}
*{box-sizing:border-box;margin:0;padding:0;font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB",Arial,sans-serif;}
body{background:var(--bg);color:var(--ink);line-height:1.65;font-size:15px;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}

/* header */
header{background:var(--blue);color:#fff;padding:14px 6%;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:50;box-shadow:0 2px 10px rgba(0,0,0,.15);}
.logo{font-size:20px;font-weight:700;letter-spacing:.5px;}
.logo span{color:var(--gold);}
nav{display:flex;align-items:center;gap:22px;}
nav a{color:#fff;font-size:14px;opacity:.92;transition:.2s;}
nav a:hover,nav a.active{opacity:1;color:var(--gold);}
.nav-btn{background:var(--gold);color:#fff;border:none;padding:7px 16px;border-radius:4px;font-size:13px;cursor:pointer;}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:24px;cursor:pointer;}

/* hero */
.hero{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;padding:74px 6%;text-align:center;}
.hero h1{font-size:38px;margin-bottom:16px;font-weight:700;line-height:1.3;}
.hero p{font-size:17px;opacity:.92;max-width:760px;margin:0 auto 18px;}
.hero .tag{display:inline-block;background:rgba(255,255,255,.15);padding:7px 18px;border-radius:22px;margin:4px;font-size:14px;}
.btns{margin-top:26px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}
.btn{display:inline-block;padding:12px 28px;border-radius:6px;font-size:15px;font-weight:600;transition:.2s;}
.btn-gold{background:var(--gold);color:#fff;}
.btn-gold:hover{background:#b87f1f;}
.btn-line{border:1px solid rgba(255,255,255,.6);color:#fff;}
.btn-line:hover{background:rgba(255,255,255,.12);}

/* section */
section{padding:56px 6%;}
.wrap{max-width:1120px;margin:0 auto;}
h2{color:var(--blue);font-size:27px;margin-bottom:8px;border-left:5px solid var(--gold);padding-left:13px;}
.sub{color:var(--muted);margin-bottom:30px;font-size:15px;}

/* grid cards */
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;}
.card{background:#fff;border-radius:10px;padding:26px;box-shadow:0 4px 18px rgba(0,0,0,.06);transition:.2s;border:1px solid var(--line);}
.card:hover{transform:translateY(-4px);box-shadow:0 10px 26px rgba(0,0,0,.1);}
.card .ico{font-size:32px;margin-bottom:10px;}
.card h3{color:var(--blue);font-size:19px;margin-bottom:8px;}
.card p{color:var(--muted);font-size:14px;}

/* about */
.about{display:grid;grid-template-columns:1.4fr 1fr;gap:36px;align-items:center;}
.about .ph{background:#e8edf3;border-radius:10px;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;color:#9bb0c9;font-size:14px;text-align:center;padding:20px;}
.about p{color:#444;margin-bottom:14px;}
.stats{display:flex;gap:30px;margin-top:18px;flex-wrap:wrap;}
.stats div{text-align:center;}
.stats b{display:block;font-size:28px;color:var(--gold);}
.stats span{font-size:13px;color:var(--muted);}

/* contact */
.contact{background:var(--blue);color:#fff;border-radius:12px;padding:42px;text-align:center;}
.contact a{color:var(--gold);}
.contact .info{margin:16px 0;font-size:16px;line-height:2;}
.contact .qr{background:#fff;border-radius:10px;width:150px;height:150px;margin:18px auto 0;display:flex;align-items:center;justify-content:center;color:#9bb0c9;font-size:13px;}

/* products detail */
.prod{background:#fff;border:1px solid var(--line);border-radius:10px;padding:28px;margin-bottom:22px;display:grid;grid-template-columns:160px 1fr;gap:24px;align-items:center;}
.prod .ph{background:#e8edf3;border-radius:8px;aspect-ratio:1;display:flex;align-items:center;justify-content:center;color:#9bb0c9;font-size:13px;text-align:center;}
.prod h3{color:var(--blue);font-size:20px;margin-bottom:8px;}
.prod p{color:#555;font-size:14px;margin-bottom:8px;}
.prod ul{color:#555;font-size:14px;padding-left:20px;}
.prod li{margin:3px 0;}

/* cases */
.case{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;box-shadow:0 4px 18px rgba(0,0,0,.05);}
.case .ph{background:#e8edf3;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;color:#9bb0c9;font-size:14px;}
.case .body{padding:20px;}
.case h3{color:var(--blue);font-size:18px;margin-bottom:6px;}
.case p{color:#555;font-size:14px;}

/* qual */
.qual{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.qual-item{background:#fff;border:1px solid var(--line);border-radius:10px;padding:24px;text-align:center;}
.qual-item .ico{font-size:34px;margin-bottom:10px;}
.qual-item h3{color:var(--blue);font-size:17px;margin-bottom:6px;}
.qual-item p{color:var(--muted);font-size:13px;}

/* breadcrumb */
.crumb{font-size:13px;color:var(--muted);margin-bottom:18px;}
.crumb a:hover{color:var(--blue);}

/* footer */
footer{background:#16263f;color:#9fb0c7;text-align:center;padding:30px 6%;font-size:13px;line-height:1.9;}
footer a{color:var(--gold);}
.foot-links{margin-bottom:10px;}
.foot-links a{margin:0 10px;}

/* responsive */
@media(max-width:720px){
  .grid,.about,.qual{grid-template-columns:1fr;}
  .prod{grid-template-columns:1fr;}
  nav{position:absolute;top:60px;right:6%;background:var(--blue);flex-direction:column;width:200px;padding:14px;gap:14px;display:none;border-radius:0 0 8px 8px;}
  nav.open{display:flex;}
  .nav-toggle{display:block;}
  .hero h1{font-size:26px;}
  section{padding:40px 6%;}
  .contact{padding:28px 6%;}
}