:root{
  --primary:#0b3d6f;
  --primary-dark:#072a4d;
  --accent:#1a9fd0;
  --accent-light:#e6f5fb;
  --text:#2b3440;
  --muted:#6b7684;
  --bg:#f6f8fa;
  --white:#ffffff;
  --radius:10px;
  --shadow:0 6px 24px rgba(11,61,111,.10);
  --shadow-hover:0 12px 32px rgba(11,61,111,.18);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI","Helvetica Neue",Arial,"Noto Sans",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1180px;margin:0 auto;padding:0 20px}

/* ===== Header ===== */
.topbar{background:var(--primary-dark);color:#cfe3f2;font-size:.85rem;padding:6px 0}
.topbar .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:4px}
.topbar a{color:#fff}
header.site{position:sticky;top:0;z-index:100;background:var(--white);box-shadow:0 2px 12px rgba(0,0,0,.08)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;padding:12px 20px;max-width:1180px;margin:0 auto}
.brand{display:flex;align-items:center;gap:12px}
.brand img{width:52px;height:52px;border-radius:8px;object-fit:cover}
.brand .name{font-weight:700;color:var(--primary);font-size:1.05rem;line-height:1.25}
.brand .name small{display:block;font-weight:400;color:var(--muted);font-size:.72rem}
nav.main-nav ul{list-style:none;display:flex;gap:6px;flex-wrap:wrap}
nav.main-nav a{display:block;padding:10px 16px;border-radius:8px;color:var(--text);font-weight:600;font-size:.95rem;transition:.2s}
nav.main-nav a:hover,nav.main-nav a.active{background:var(--accent-light);color:var(--primary);text-decoration:none}
.nav-cta{background:var(--accent);color:#fff !important}
.nav-cta:hover{background:var(--primary);color:#fff !important}

/* ===== Hero ===== */
.hero{position:relative;background:linear-gradient(105deg,rgba(7,42,77,.88) 0%,rgba(11,61,111,.72) 45%,rgba(26,159,208,.45) 100%),url('/img/banner.jpg') center/cover no-repeat;color:#fff;padding:110px 0 130px}
.hero h1{font-size:clamp(1.7rem,4vw,2.7rem);font-weight:800;max-width:820px;text-shadow:0 2px 12px rgba(0,0,0,.35)}
.hero p{margin:18px 0 30px;font-size:clamp(1rem,2vw,1.2rem);max-width:720px;color:#e8f2f9}
.btn{display:inline-block;padding:14px 32px;border-radius:50px;font-weight:700;transition:.25s;border:2px solid transparent;cursor:pointer}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#fff;color:var(--primary);text-decoration:none;transform:translateY(-2px)}
.btn-outline{border-color:#fff;color:#fff;margin-left:12px}
.btn-outline:hover{background:#fff;color:var(--primary);text-decoration:none;transform:translateY(-2px)}
.btn-sm{padding:10px 24px;font-size:.9rem}

/* ===== Sections ===== */
section{padding:70px 0}
.section-title{text-align:center;margin-bottom:44px}
.section-title h2{font-size:clamp(1.4rem,3vw,2rem);color:var(--primary);position:relative;display:inline-block;padding-bottom:14px}
.section-title h2::after{content:"";position:absolute;left:50%;transform:translateX(-50%);bottom:0;width:64px;height:4px;border-radius:2px;background:var(--accent)}
.section-title p{color:var(--muted);margin-top:12px;max-width:760px;margin-left:auto;margin-right:auto}
.grid{display:grid;gap:26px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.3s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.card img{width:100%;aspect-ratio:4/3;object-fit:cover}
.card .body{padding:22px;flex:1;display:flex;flex-direction:column}
.card h3{color:var(--primary);font-size:1.1rem;margin-bottom:10px}
.card p{color:var(--muted);font-size:.92rem;flex:1}
.card .more{margin-top:16px;font-weight:700;color:var(--accent)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat{background:var(--white);border-radius:var(--radius);padding:28px 12px;box-shadow:var(--shadow)}
.stat b{display:block;font-size:2rem;color:var(--accent)}
.stat span{color:var(--muted);font-size:.9rem}

/* ===== CTA band ===== */
.cta-band{background:linear-gradient(100deg,var(--primary) 0%,var(--accent) 100%);color:#fff;padding:56px 0}
.cta-band .container{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.cta-band h2{font-size:clamp(1.3rem,3vw,1.8rem)}
.cta-band p{color:#e2f2fa;margin-top:6px}
.cta-band .btn{background:#fff;color:var(--primary)}
.cta-band .btn:hover{background:var(--primary-dark);color:#fff}

/* ===== Content pages ===== */
.page-head{background:linear-gradient(100deg,rgba(7,42,77,.9),rgba(26,159,208,.7)),url('/img/banner.jpg') center/cover no-repeat;color:#fff;text-align:center;padding:64px 0}
.page-head h1{font-size:clamp(1.5rem,3vw,2.2rem)}
.breadcrumbs{font-size:.85rem;margin-top:10px;color:#d7e9f5}
.breadcrumbs a{color:#fff}
.breadcrumbs span{margin:0 6px}
.content{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);padding:44px;margin-top:-40px;position:relative}
.content h2{color:var(--primary);font-size:1.35rem;margin:32px 0 14px}
.content h3{color:var(--primary);font-size:1.1rem;margin:24px 0 10px}
.content p,.content li{color:#3d4754}
.content ul,.content ol{margin:12px 0 12px 24px}
.content img.rounded{border-radius:var(--radius);margin:18px 0}
.two-col{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:center}
.two-col img{border-radius:var(--radius);box-shadow:var(--shadow)}

/* ===== Product detail ===== */
.product-layout{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.product-layout .pic{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.product-layout .pic img{width:100%}
.spec-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.93rem}
.spec-table th,.spec-table td{border:1px solid #e3e9ef;padding:10px 14px;text-align:left}
.spec-table th{background:var(--accent-light);color:var(--primary);width:38%}
.tagline{display:inline-block;background:var(--accent-light);color:var(--primary);border-radius:30px;padding:4px 16px;font-size:.85rem;font-weight:600;margin:0 8px 10px 0}

/* ===== FAQ ===== */
.faq-item{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:22px;overflow:hidden}
.faq-item summary{cursor:pointer;padding:20px 24px;font-weight:700;color:var(--primary);font-size:1.05rem;list-style:none;position:relative;padding-right:48px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:22px;top:50%;transform:translateY(-50%);font-size:1.5rem;color:var(--accent)}
.faq-item[open] summary::after{content:"–"}
.faq-item .faq-body{padding:0 24px 24px;border-top:1px solid #eef2f6;padding-top:16px;color:#3d4754}

/* ===== Contact form ===== */
.contact-wrap{display:grid;grid-template-columns:1fr 1.2fr;gap:36px;align-items:start}
.info-card,.form-card{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px}
.form-card label{display:block;font-weight:600;margin:14px 0 6px;color:var(--primary)}
.form-card input,.form-card textarea{width:100%;padding:13px 16px;border:1px solid #d7dee6;border-radius:8px;font-size:1rem;font-family:inherit;transition:.2s}
.form-card input:focus,.form-card textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(26,159,208,.15)}
.form-card textarea{min-height:150px;resize:vertical}
.hp{position:absolute;left:-9999px}
.notice{margin-top:16px;padding:12px 16px;border-radius:8px;font-size:.92rem;display:none}
.notice.ok{display:block;background:#e8f7ee;color:#1c7c3d;border:1px solid #bfe6cf}
.notice.err{display:block;background:#fdecec;color:#b02a2a;border:1px solid #f3c6c6}

/* ===== Footer ===== */
footer.site{background:var(--primary-dark);color:#b9cdda;padding:56px 0 0;margin-top:70px}
footer.site .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;padding-bottom:40px}
footer.site h4{color:#fff;margin-bottom:16px;font-size:1rem}
footer.site ul{list-style:none}
footer.site li{margin-bottom:9px}
footer.site a{color:#b9cdda}
footer.site a:hover{color:#fff}
.copy{border-top:1px solid rgba(255,255,255,.12);text-align:center;padding:18px 0;font-size:.85rem;color:#8fa9bd}

/* ===== Responsive ===== */
@media (max-width:960px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .two-col,.contact-wrap,.product-layout{grid-template-columns:1fr}
  footer.site .cols{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  footer.site .cols{grid-template-columns:1fr}
  .hero{padding:80px 0 100px}
  .btn-outline{margin-left:0;margin-top:12px}
  .content{padding:26px}
  section{padding:50px 0}
}