:root{
    --navy:#0e2a47; --blue:#1b6ac9; --blue-soft:#eaf2fb; --ink:#1d2733;
    --muted:#5d6b7a; --line:#e3e8ee; --bg:#ffffff; --bg-soft:#f6f8fa;
  }
  *{margin:0;padding:0;box-sizing:border-box}
  body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65}
  img{max-width:100%;display:block}
  a{text-decoration:none;color:inherit}
  .wrap{max-width:1120px;margin:0 auto;padding:0 24px}

  /* header */
  header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
  .nav{display:flex;align-items:center;justify-content:space-between;height:64px}
  .logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--navy);letter-spacing:.5px}
  .logo-mark{width:34px;height:34px;border-radius:8px;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700}
  .logo small{display:block;font-size:10px;font-weight:500;color:var(--muted);letter-spacing:2px}
  nav ul{display:flex;gap:28px;list-style:none;font-size:14.5px}
  nav a{color:var(--muted);padding:6px 0;border-bottom:2px solid transparent}
  nav a:hover{color:var(--navy);border-color:var(--blue)}
  .nav-cta{background:var(--blue);color:#fff !important;padding:9px 18px;border-radius:8px;border:none !important;font-weight:500}
  .nav-cta:hover{background:var(--navy)}
  .burger{display:none;background:none;border:none;font-size:22px;color:var(--navy);cursor:pointer}

  /* hero */
  .hero{background:linear-gradient(180deg,var(--navy) 0%,#123a63 100%);color:#fff;padding:88px 0 96px}
  .hero h1{font-size:40px;line-height:1.2;font-weight:700;max-width:640px}
  .hero h1 span{color:#7db4ea}
  .hero p{margin-top:18px;font-size:17px;color:#c8d6e6;max-width:560px}
  .hero-actions{margin-top:32px;display:flex;gap:14px;flex-wrap:wrap}
  .btn{padding:13px 26px;border-radius:9px;font-size:15px;font-weight:500;display:inline-block}
  .btn-primary{background:var(--blue);color:#fff}
  .btn-primary:hover{background:#155bb0}
  .btn-ghost{border:1px solid rgba(255,255,255,.45);color:#fff}
  .btn-ghost:hover{background:rgba(255,255,255,.1)}
  .hero-tags{margin-top:44px;display:flex;gap:26px;flex-wrap:wrap;font-size:13.5px;color:#a9bdd4}
  .hero-tags b{display:block;color:#fff;font-size:21px;font-weight:700}

  /* sections */
  section{padding:76px 0}
  .kicker{font-size:12.5px;letter-spacing:2.5px;text-transform:uppercase;color:var(--blue);font-weight:600;margin-bottom:10px}
  h2{font-size:29px;color:var(--navy);font-weight:700;margin-bottom:14px}
  .lead{color:var(--muted);max-width:660px;font-size:15.5px}

  .about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:start;margin-top:34px}
  .about-grid p{color:var(--muted);margin-bottom:14px;font-size:15.5px}
  .fact-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;padding:26px}
  .fact-card h3{font-size:15px;color:var(--navy);margin-bottom:14px}
  .fact-card ul{list-style:none;font-size:14.5px}
  .fact-card li{display:flex;gap:10px;padding:8px 0;border-bottom:1px dashed var(--line);color:var(--muted)}
  .fact-card li:last-child{border:none}
  .fact-card li b{color:var(--ink);font-weight:600;min-width:96px}

  /* products */
  .products{background:var(--bg-soft)}
  .prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
  .prod-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:transform .15s,box-shadow .15s}
  .prod-card:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(14,42,71,.09)}
  .prod-thumb{height:150px;display:flex;align-items:center;justify-content:center;background:var(--blue-soft);color:var(--blue);font-size:34px}
  .prod-body{padding:18px 20px 22px}
  .prod-body h3{font-size:16.5px;color:var(--navy);margin-bottom:6px}
  .prod-body p{font-size:13.5px;color:var(--muted)}
  .placeholder-tag{display:inline-block;margin-top:10px;font-size:11px;letter-spacing:1px;color:#b06a00;background:#fdf3e2;border:1px solid #f0dcb4;border-radius:5px;padding:2px 8px}

  .vgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:30px}
  .vcard{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 20px 22px}
  .vcard .sub{font-size:11.5px;color:var(--blue);letter-spacing:1.5px;text-transform:uppercase;margin-bottom:4px}
  .vcard h3{font-size:15.5px;color:var(--navy)}
  .vcard p{font-size:13px;color:var(--muted);margin-top:6px}
  .spec-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:26px}
  .spec-strip div{background:var(--bg-soft);border-radius:10px;padding:13px 15px;font-size:13px;color:var(--muted)}
  .spec-strip b{color:var(--navy);display:block;margin-bottom:2px}
  .cert-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
  .cert-row span{border:1px solid var(--line);border-radius:20px;padding:5px 15px;font-size:12.5px;color:var(--muted);background:#fff}
  .img2{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:28px}
  .img2 img{width:100%;height:250px;object-fit:cover;border-radius:12px;border:1px solid var(--line)}
  .film-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:30px}
  .film-grid .fcard{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 16px 20px}
  .film-grid .fic{font-size:26px;margin-bottom:10px}
  .film-grid h3{font-size:14.5px;color:var(--navy);margin-bottom:6px}
  .film-grid p{font-size:12.5px;color:var(--muted);line-height:1.55}
  .qr{margin-top:10px;width:132px;border-radius:12px;background:#fff;padding:8px;border:1px solid var(--line)}
  .sub-h{margin-top:48px;font-size:20px;color:var(--navy);font-weight:600}
  .sub-p{font-size:13.5px;color:var(--muted);margin-top:4px;max-width:660px}

  /* why us */
  .why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:36px}
  .why-item{border:1px solid var(--line);border-radius:14px;padding:24px 22px}
  .why-item .ic{width:40px;height:40px;border-radius:10px;background:var(--blue-soft);display:flex;align-items:center;justify-content:center;font-size:19px;margin-bottom:14px}
  .why-item h3{font-size:15.5px;color:var(--navy);margin-bottom:6px}
  .why-item p{font-size:13.5px;color:var(--muted)}

  /* contact */
  .contact{background:linear-gradient(180deg,var(--navy),#123a63);color:#fff}
  .contact h2{color:#fff}
  .contact .lead{color:#c2d2e4}
  .contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;margin-top:38px}
  .c-item{display:flex;gap:14px;margin-bottom:22px;font-size:15px;color:#dbe6f2}
  .c-item b{color:#fff;display:block;font-size:13px;letter-spacing:1px;text-transform:uppercase;margin-bottom:3px}
  form label{display:block;font-size:13px;color:#c2d2e4;margin:14px 0 6px}
  form input,form textarea{width:100%;padding:12px 14px;border-radius:9px;border:1px solid rgba(255,255,255,.25);background:rgba(255,255,255,.08);color:#fff;font-size:14.5px;font-family:inherit}
  form input::placeholder,form textarea::placeholder{color:#8ba3bd}
  form button{margin-top:18px;width:100%;background:var(--blue);border:none;color:#fff;padding:14px;border-radius:9px;font-size:15px;font-weight:600;cursor:pointer}
  form button:hover{background:#155bb0}

  footer{background:#0a1f36;color:#7f93a9;padding:26px 0;font-size:13px}
  .foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

    @media(max-width:860px){
    nav ul{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:18px 24px;border-bottom:1px solid var(--line);gap:14px}
    nav ul.open{display:flex}
    .burger{display:block}
    .hero h1{font-size:30px}
    .about-grid,.contact-grid,.prod-grid{grid-template-columns:1fr}
    .why-grid{grid-template-columns:1fr 1fr}
    .prod-thumb{height:130px}
    .vgrid,.film-grid{grid-template-columns:1fr 1fr}
    .img2{grid-template-columns:1fr}
    .spec-strip{grid-template-columns:1fr 1fr}
  }
  @media(max-width:520px){.why-grid,.vgrid,.film-grid{grid-template-columns:1fr}}
  /* product entry cards */
  .entry-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:38px}
  .entry{display:block;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:transform .18s,box-shadow .18s}
  .entry:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(14,42,71,.12)}
  .entry img{width:100%;height:300px;object-fit:cover;display:block}
  .entry-body{padding:26px 28px 30px}
  .entry-body h2{margin-bottom:8px}
  .entry-body p{color:var(--muted);font-size:14.5px;margin-bottom:14px}
  .entry-link{color:var(--blue);font-weight:600;font-size:14.5px}
  .hero-sm{padding:64px 0 72px}
  .hero-sm h1{font-size:33px}
  @media(max-width:860px){.entry-grid{grid-template-columns:1fr}.entry img{height:220px}}