/* Shenan Yangguang — GEO-optimized standalone site
   Design: trustworthy security-tech. Lean CSS, no render-blocking JS, fast LCP. */
:root{
  --navy:#0B1F3A; --navy2:#102a4c; --ink:#16202e; --muted:#5b6b7e;
  --teal:#00B4D8; --teal-d:#0091b0; --line:#e4e9f0; --bg:#ffffff; --bg2:#f5f8fb;
  --ok:#1f9d55; --warn:#c9772b;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--teal-d);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
header.site{position:sticky;top:0;z-index:50;background:rgba(11,31,58,.96);backdrop-filter:blur(6px)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;letter-spacing:.3px}
.brand .logo{width:30px;height:30px;border-radius:7px;background:linear-gradient(135deg,var(--teal),#7C4DFF);display:inline-block}
.nav nav{display:flex;gap:22px}
.nav nav a{color:#cfe0f0;font-size:14.5px;font-weight:500}
.nav nav a:hover{color:#fff;text-decoration:none}
.btn{display:inline-block;background:var(--teal);color:#04222b;font-weight:700;padding:11px 20px;border-radius:8px;font-size:14.5px}
.btn:hover{background:#19c6e6;text-decoration:none}
.btn.ghost{background:transparent;color:#fff;border:1px solid #3a5b85}
.hero{background:radial-gradient(1200px 500px at 70% -10%,#16365f 0%,var(--navy) 55%);color:#eaf2fa;padding:74px 0 64px}
.hero h1{font-size:40px;line-height:1.18;margin:0 0 16px;max-width:760px}
.hero p.lead{font-size:18px;color:#bcd2e6;max-width:640px;margin:0 0 26px}
.pills{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.pill{background:rgba(0,180,216,.14);border:1px solid rgba(0,180,216,.35);color:#bfe9f5;padding:7px 13px;border-radius:999px;font-size:13px}
section{padding:56px 0}
section.alt{background:var(--bg2)}
h2.sec{font-size:28px;margin:0 0 8px}
.sub{color:var(--muted);margin:0 0 30px;font-size:15.5px}
.grid{display:grid;gap:20px}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(11,31,58,.08)}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:14.5px}
.tag{display:inline-block;font-size:12px;font-weight:700;color:var(--teal-d);background:#e6f7fb;padding:3px 9px;border-radius:6px;margin-bottom:10px}
.split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}
.feature-list{list-style:none;padding:0;margin:14px 0 0}
.feature-list li{padding:8px 0 8px 28px;position:relative;border-top:1px solid var(--line);font-size:15px}
.feature-list li:before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:700}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;text-align:center}
.stat .n{font-size:30px;font-weight:800;color:var(--navy)}
.stat .l{font-size:13px;color:var(--muted)}
.cta{background:linear-gradient(135deg,#0B1F3A,#143a63);color:#fff;border-radius:16px;padding:40px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.cta h3{margin:0 0 6px;font-size:24px}
.cta p{margin:0;color:#bcd2e6}
.breadcrumb{font-size:13px;color:var(--muted);padding:14px 0 0}
.breadcrumb a{color:var(--muted)}
form.inquiry{display:grid;gap:14px;max-width:560px}
form.inquiry .hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
form.inquiry .form-error{display:none;background:#fdecea;border:1px solid #f5c2bd;color:#9b2c1f;padding:10px 14px;border-radius:8px;font-size:13.5px;margin-bottom:4px}
form.inquiry .form-error[hidden]{display:none}
form.inquiry .form-error:not([hidden]){display:block}
form.inquiry label{font-size:13.5px;font-weight:600;color:var(--ink)}
form.inquiry input,form.inquiry textarea,form.inquiry select{padding:11px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;width:100%}
form.inquiry .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
table.spec{width:100%;border-collapse:collapse;font-size:14px;margin-top:8px}
table.spec th,table.spec td{border:1px solid var(--line);padding:10px 12px;text-align:left}
table.spec th{background:var(--bg2);font-weight:700}
.faq{margin-top:10px}
.faq details{border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:10px;background:#fff}
.faq summary{font-weight:700;cursor:pointer}
.faq p{margin:10px 0 0;color:var(--muted)}
.post{display:block;border:1px solid var(--line);border-radius:12px;padding:20px;margin-bottom:16px;background:#fff}
.post h3{margin:0 0 6px;font-size:18px}
.post .meta{font-size:12.5px;color:var(--muted);margin-bottom:8px}
.post p{margin:0;color:var(--muted);font-size:14.5px}
footer.site{background:var(--navy);color:#9fb4cc;padding:40px 0 30px;font-size:13.5px}
footer.site a{color:#cfe0f0}
footer.site .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}
footer.site h4{color:#fff;font-size:14px;margin:0 0 12px}
.disclaimer{font-size:12px;color:#7d93ab;border-top:1px solid #1c3354;margin-top:26px;padding-top:16px}
/* header logo image (Shenan Yangguang badge) */
.brand img.logo{width:34px;height:34px;border-radius:50%;background:#fff;object-fit:contain;padding:1px;display:block}
/* factory real photos */
.photos{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}
.photos figure{margin:0}
.photos img{width:100%;height:172px;object-fit:cover;border-radius:10px;display:block;border:1px solid var(--line);background:#eef3f8}
.photos figcaption{font-size:13px;color:var(--muted);margin-top:7px}
/* certifications */
.certs{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.cert{border:1px solid var(--line);border-radius:8px;padding:9px 15px;font-weight:700;font-size:13.5px;color:var(--navy);background:#fff}
.cert em{display:block;font-weight:400;font-style:normal;font-size:11.5px;color:var(--muted)}
/* footer social + contact */
.social{display:flex;gap:14px;margin-top:10px;flex-wrap:wrap}
.social a{font-size:13px;color:#cfe0f0}
/* factory showcase video band */
.showcase{position:relative;background:var(--navy);overflow:hidden;line-height:0}
.showcase video{display:block;width:100%;height:auto;max-height:600px;object-fit:cover;filter:saturate(1.05)}
.showcase .overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:flex-end;padding:36px 0;background:linear-gradient(180deg,rgba(11,31,58,.10) 0%,rgba(11,31,58,.72) 100%)}
.showcase .overlay h2{color:#fff;font-size:30px;line-height:1.2;margin:0 0 8px;line-height:normal}
.showcase .overlay p{color:#cfe0f0;margin:0;max-width:660px;font-size:16px}
@media(max-width:860px){
  .showcase video{max-height:360px}
  .showcase .overlay h2{font-size:22px}
}
  .grid.c3,.grid.c2,.split,.stats,.photos{grid-template-columns:1fr}
  .photos{grid-template-columns:1fr 1fr}
  .nav nav{display:none}
  .hero h1{font-size:30px}
  form.inquiry .row{grid-template-columns:1fr}
  footer.site .cols{grid-template-columns:1fr 1fr}
}