:root{
  --c-navy:#0B2A4A;
  --c-navy-2:#10395f;
  --c-gray:#5B6573;
  --c-gold:#C9A24B;
  --c-bg:#ffffff;
  --c-bg-2:#f4f6f9;
  --c-ink:#1f2733;
  --c-line:#e2e7ee;
  --maxw:1200px;
  --radius:10px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:"PingFang SC","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
  color:var(--c-ink);background:var(--c-bg);line-height:1.7;font-size:16px;
}
a{color:var(--c-navy);text-decoration:none}
a:hover{color:var(--c-gold)}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(6px);border-bottom:1px solid var(--c-line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--c-navy);letter-spacing:.5px}
.logo .mark{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:8px;background:var(--c-navy);color:#fff;font-size:14px;font-weight:800}
.nav ul{display:flex;gap:22px;list-style:none;margin:0;padding:0;align-items:center}
.nav a{font-size:15px;color:var(--c-ink);font-weight:500}
.nav a:hover{color:var(--c-gold)}
.nav-toggle{display:none;background:none;border:0;font-size:24px;cursor:pointer;color:var(--c-navy)}

/* Hero */
.hero{background:linear-gradient(135deg,var(--c-navy),var(--c-navy-2));color:#fff;padding:64px 0 56px}
.hero h1{font-size:38px;line-height:1.25;margin:0 0 14px;font-weight:800}
.hero p.lead{font-size:18px;color:#cdd8e6;max-width:760px;margin:0 0 26px}
.hero .tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.hero .tag{background:rgba(201,162,75,.16);color:var(--c-gold);border:1px solid rgba(201,162,75,.4);padding:6px 12px;border-radius:999px;font-size:13px}
.btn{display:inline-block;background:var(--c-gold);color:#1c1402;font-weight:700;padding:12px 22px;border-radius:8px;font-size:15px}
.btn:hover{color:#1c1402;filter:brightness(1.05)}
.btn.ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.5)}

/* Sections */
section{padding:56px 0}
.section-title{font-size:28px;font-weight:800;color:var(--c-navy);margin:0 0 8px}
.section-sub{color:var(--c-gray);margin:0 0 32px;max-width:720px}
.bg-2{background:var(--c-bg-2)}

/* Grids */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:24px;transition:.2s}
.card:hover{box-shadow:0 8px 24px rgba(11,42,74,.08);border-color:var(--c-gold)}
.card h3{margin:0 0 10px;color:var(--c-navy);font-size:20px}
.card .ico{width:44px;height:44px;border-radius:10px;background:var(--c-bg-2);color:var(--c-navy);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:12px}
.card p{color:var(--c-gray);margin:0 0 14px}

/* Product */
.product-hero{background:linear-gradient(135deg,var(--c-navy),var(--c-navy-2));color:#fff;padding:48px 0}
.product-hero h1{font-size:32px;margin:0 0 10px}
.product-hero p{color:#cdd8e6;max-width:760px}
.spec{width:100%;border-collapse:collapse;margin-top:8px}
.spec th,.spec td{border:1px solid var(--c-line);padding:10px 12px;text-align:left;font-size:14px}
.spec th{background:var(--c-bg-2);color:var(--c-navy);width:180px}

/* FAQ */
.faq-item{border:1px solid var(--c-line);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-q{width:100%;text-align:left;background:#fff;border:0;padding:16px 18px;font-size:16px;font-weight:600;color:var(--c-navy);cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-a{padding:0 18px 16px;color:var(--c-gray);display:none}
.faq-item.open .faq-a{display:block}

/* Downloads */
.dl-cat{margin-bottom:28px}
.dl-cat h3{color:var(--c-navy);border-left:4px solid var(--c-gold);padding-left:10px}
.dl-list{list-style:none;margin:0;padding:0}
.dl-list li{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;border:1px solid var(--c-line);border-radius:8px;margin-bottom:10px;background:#fff}
.dl-list a{font-weight:600}

/* Forms */
.form-grid{display:grid;gap:14px;max-width:520px}
label{font-size:14px;color:var(--c-gray);display:block;margin-bottom:6px}
input,textarea,select{width:100%;padding:11px 12px;border:1px solid var(--c-line);border-radius:8px;font-size:15px;font-family:inherit}
input:focus,textarea:focus,select:focus{outline:2px solid var(--c-gold);border-color:var(--c-gold)}

/* Footer */
.site-footer{background:var(--c-navy);color:#cdd8e6;padding:40px 0 24px;font-size:14px}
.site-footer a{color:#cdd8e6}
.site-footer a:hover{color:var(--c-gold)}
.footer-cols{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.footer-cols h4{color:#fff;margin:0 0 12px;font-size:15px}
.footer-cols ul{list-style:none;margin:0;padding:0}
.footer-cols li{margin-bottom:8px}
.footer-contact{margin-top:24px;padding-top:16px;border-top:1px solid rgba(255,255,255,.12);line-height:1.9}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:16px;color:#9fb0c4}

/* Misc */
.breadcrumb{font-size:13px;color:var(--c-gray);margin:14px 0}
.breadcrumb a{color:var(--c-gray)}
.lead-block{font-size:17px;color:var(--c-ink);max-width:820px}
.pill{display:inline-block;background:var(--c-bg-2);color:var(--c-navy);border:1px solid var(--c-line);border-radius:999px;padding:4px 12px;font-size:13px;margin:3px}
.note{background:#fff8e8;border:1px solid #f0d99a;color:#7a5b12;padding:12px 14px;border-radius:8px;font-size:14px;margin:16px 0}

@media (max-width:880px){
  .grid-3,.grid-2{grid-template-columns:1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-cols{grid-template-columns:1fr 1fr}
  .nav ul{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:14px 20px;border-bottom:1px solid var(--c-line)}
  .nav ul.show{display:flex}
  .nav-toggle{display:block}
  .hero h1{font-size:28px}
}