:root{
  --bg:#f8fafc; --ink:#1f2933; --muted:#5b6b7b; --line:#dbe4ee;
  --brand:#0a4a96; --brand2:#053263; --soft:#eef4fb; --card:#ffffff;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:var(--brand2);text-decoration:none}
a:hover{color:var(--brand);text-decoration:underline}

/* header */
.site-header{background:#fff;color:var(--ink);position:sticky;top:0;z-index:10;border-bottom:1px solid var(--line);box-shadow:0 1px 3px rgba(5,50,99,.06)}
.site-header .nav{display:flex;align-items:center;gap:18px;padding:10px 20px;flex-wrap:wrap}
.site-header .logo{display:flex;align-items:center}
.site-header .logo img{height:64px;width:auto;display:block}
.site-header nav{display:flex;gap:16px;flex:1;flex-wrap:wrap;justify-content:flex-end}
.site-header nav a{color:#33475a;font-weight:500}
.site-header nav a:hover{color:var(--brand)}
.site-header .cta{background:var(--brand);color:#fff;padding:7px 16px;border-radius:8px;font-weight:600}
.site-header .cta:hover{text-decoration:none;opacity:.92}

/* hero */
.hero{background:linear-gradient(135deg,#053263,#0a4a96);color:#fff;padding:40px 0;border-radius:0 0 16px 16px;overflow:hidden}
.hero-inner{display:flex;gap:36px;align-items:center}
.hero-copy{flex:1;min-width:0}
.hero h1{font-size:30px;margin:0 0 12px;line-height:1.32}
.hero .lead{font-size:16px;color:#dbe8fb;max-width:620px;margin:0}
.hero-cta{margin-top:22px;display:flex;gap:12px;flex-wrap:wrap}
.hero .btn{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.35)}
.hero .btn:hover{background:rgba(255,255,255,.22);text-decoration:none}
.hero .btn.primary{background:#fff;color:var(--brand2);border-color:#fff}
.hero .btn.primary:hover{opacity:.92}
.hero-cats{list-style:none;display:flex;flex-wrap:wrap;gap:14px 22px;margin:26px 0 0;padding:0}
.hero-cats li{display:flex;align-items:center;gap:7px;font-size:13px;color:#cfe0f5}
.hero-cats svg{width:20px;height:20px;flex:0 0 20px;stroke:#9fc6ff;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.hero-brands{flex:0 0 320px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:14px;padding:18px}
.hero-brands-title{margin:0 0 12px;font-size:13px;color:#bcd4f0;letter-spacing:.5px}
.brand-wall{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.bw{display:flex;flex-direction:column;gap:1px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16);border-radius:8px;padding:7px 10px;color:#fff;transition:.15s}
.bw:hover{background:rgba(255,255,255,.2);text-decoration:none;border-color:rgba(255,255,255,.4)}
.bw-en{font-size:12px;font-weight:700;letter-spacing:.4px;color:#eaf2fb}
.bw-cn{font-size:12px;color:#bcd4f0}
.btn{display:inline-block;padding:10px 18px;border-radius:9px;background:var(--soft);color:var(--brand);font-weight:600;border:1px solid var(--line)}
.btn:hover{text-decoration:none;background:#e2ecf8}
.btn.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
.btn.primary:hover{opacity:.92}

/* blocks */
.block{padding:34px 0}
.block h1{font-size:24px;margin:0 0 8px}
.block h2{font-size:19px;margin:26px 0 10px;color:var(--brand)}
.lead{color:#33414f;font-size:16px}
.muted{color:var(--muted);font-size:14px}

/* grids */
.grid{display:grid;gap:14px;margin-top:14px}
.grid.brands{grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}
.grid.products{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
.grid.articles{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;display:flex;flex-direction:column;gap:6px;transition:.15s}
.card:hover{border-color:var(--brand);box-shadow:0 4px 16px rgba(10,74,150,.08);text-decoration:none}
.card strong{color:var(--ink);font-size:15px}
.card span{font-size:13px}
.brand-en{color:var(--brand);font-weight:700;letter-spacing:.5px}
.tag{display:inline-block;background:var(--soft);color:var(--brand);font-size:12px;padding:2px 8px;border-radius:6px;align-self:flex-start}
.stock{font-size:12px;font-weight:600;align-self:flex-start;padding:2px 8px;border-radius:6px}
.stock.yes{background:#e6f6ee;color:#1e8e5a}
.stock.no{background:#fdf0e6;color:#c4761a}

/* spec table */
table.spec{width:100%;border-collapse:collapse;margin:10px 0;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
table.spec th,table.spec td{border:1px solid var(--line);padding:10px 12px;text-align:left;font-size:14px}
table.spec th{background:var(--soft);color:var(--brand);width:30%;font-weight:600}
table.spec thead th{background:#e2ecf8}

/* product page */
.product-head{display:flex;gap:24px;align-items:flex-start;flex-wrap:wrap;margin:8px 0 18px}
.product-head>div:first-child{flex:1;min-width:280px}
.product-img{flex:0 0 280px;max-width:280px}
.product-img img{width:100%;border:1px solid var(--line);border-radius:12px;background:#fff}
.product-meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:14px 0}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:8px}
.breadcrumb a{color:var(--muted)}
.scenes{margin:8px 0;padding-left:20px}
.scenes li{margin:4px 0}

/* faq */
.faq{border:1px solid var(--line);border-radius:10px;overflow:hidden;margin:10px 0}
.faq-item{padding:12px 14px;border-bottom:1px solid var(--line)}
.faq-item:last-child{border-bottom:none}
.faq-item .q{font-weight:600;margin:0 0 4px}
.faq-item .a{margin:0;color:#33414f}

/* cta box */
.cta-box{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:22px 0;display:flex;gap:14px;align-items:center;flex-wrap:wrap;justify-content:space-between}
.cta-box .btn{white-space:nowrap}

/* chips */
.chip{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:20px;padding:4px 12px;margin:4px 6px 0 0;font-size:13px;color:var(--brand)}
.chip:hover{text-decoration:none;border-color:var(--brand)}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:16px}
.contact-info p{margin:6px 0}
.contact-form{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;display:flex;flex-direction:column;gap:12px}
.contact-form label{display:flex;flex-direction:column;gap:4px;font-size:14px;color:var(--muted)}
.contact-form input,.contact-form textarea{padding:9px 11px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit}
.contact-form textarea{min-height:80px;resize:vertical}

/* footer */
.site-footer{background:#0f2440;color:#cfe0f5;margin-top:40px;padding:28px 0 16px}
.footer-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.site-footer h4{color:#fff;margin:0 0 8px;font-size:15px}
.site-footer p{margin:4px 0;font-size:13px}
.site-footer a{color:#9fc6ff}
.copyright{border-top:1px solid #1c3656;margin-top:18px;padding-top:12px;font-size:12px;color:#8aa6c8}
.center{text-align:center;padding:60px 0}

@media(max-width:720px){
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-inner{flex-direction:column;align-items:stretch;gap:24px}
  .hero-brands{flex:1 1 auto}
  .brand-wall{grid-template-columns:repeat(3,1fr)}
  .hero h1{font-size:24px}
  .product-head{flex-direction:column}
  .product-img{flex:1 1 100%;max-width:100%}
  .product-img img{max-height:240px;object-fit:contain}
}