:root{--navy:#0b2545;--blue:#1360ab;--cyan:#16a3b8;--light:#f5f8fb;--gray:#5b6b7c;--radius:14px;--shadow:0 10px 30px rgba(11,37,69,.08)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Segoe UI',system-ui,-apple-system,'Helvetica Neue',Arial,sans-serif;color:#1c2b3a;line-height:1.7;background:#fff}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
.container{width:min(1180px,92%);margin:0 auto}
.narrow{max-width:860px}
.center{text-align:center;margin-top:2.2rem}
/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);box-shadow:0 1px 0 rgba(11,37,69,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:.7rem 0}
.logo img{height:52px;width:auto}
.main-nav a{margin-left:1.4rem;color:var(--navy);font-weight:600;font-size:.98rem;position:relative;padding:.4rem 0}
.main-nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--cyan);transition:width .25s}
.main-nav a:hover::after,.main-nav a.active::after{width:100%}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:.4rem}
.nav-toggle span{display:block;width:24px;height:2.5px;background:var(--navy);margin:5px 0;border-radius:2px;transition:.3s}
/* hero */
.hero,.page-hero{position:relative;overflow:hidden}
.hero-img{width:100%;height:72vh;min-height:420px;object-fit:cover}
.page-hero .hero-img{height:42vh;min-height:280px}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(100deg,rgba(6,20,40,.82) 0%,rgba(9,32,63,.55) 55%,rgba(9,32,63,.25) 100%);display:flex;align-items:center;color:#fff}
.page-hero.sub{height:120px;background:var(--navy);position:relative}
.page-hero.sub .hero-overlay{position:static;display:block;padding:1.6rem 0}
.hero h1{font-size:clamp(1.9rem,4.2vw,3.3rem);font-weight:800;line-height:1.2;margin-bottom:.9rem}
.hero p{font-size:clamp(1rem,1.6vw,1.2rem);opacity:.92;margin-bottom:1.8rem}
.btn{display:inline-block;padding:.85rem 1.9rem;border-radius:50px;font-weight:700;font-size:.98rem;transition:.25s;cursor:pointer;border:2px solid transparent}
.btn-primary{background:linear-gradient(90deg,var(--blue),var(--cyan));color:#fff;box-shadow:0 8px 22px rgba(19,96,171,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(19,96,171,.45)}
.btn-outline{border-color:rgba(255,255,255,.8);color:#fff;margin-left:.8rem}
.btn-outline:hover{background:#fff;color:var(--navy)}
.btn-light{background:#fff;color:var(--blue)}
.btn-block{width:100%}
/* sections */
.section{padding:4.2rem 0}
.section.alt{background:var(--light)}
.section-head{text-align:center;margin-bottom:2.6rem}
.section-head span{display:inline-block;color:var(--cyan);font-weight:700;letter-spacing:.12em;text-transform:uppercase;font-size:.82rem;margin-bottom:.4rem}
.section-head h2,.section h2{font-size:clamp(1.5rem,2.6vw,2.1rem);color:var(--navy);line-height:1.25}
.lead{font-size:1.06rem;color:var(--gray)}
.split{display:grid;grid-template-columns:1.15fr 1fr;gap:3rem;align-items:center}
.split-img img{border-radius:var(--radius);box-shadow:var(--shadow)}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.4rem}
.grid-2 img{border-radius:var(--radius);box-shadow:var(--shadow)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.6rem}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem}
/* advantages */
.adv{background:#fff;border-radius:var(--radius);padding:1.9rem;box-shadow:var(--shadow);border-top:3px solid var(--cyan)}
.adv-num{font-size:1.9rem;font-weight:800;color:var(--cyan);opacity:.55}
.adv h3{color:var(--navy);margin:.4rem 0 .5rem;font-size:1.1rem}
.adv p{color:var(--gray);font-size:.95rem}
/* product cards */
.product-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.3s;display:flex;flex-direction:column}
.product-card:hover{transform:translateY(-6px);box-shadow:0 16px 36px rgba(11,37,69,.14)}
.product-card img{aspect-ratio:3/2;object-fit:cover}
.card-body{padding:1.2rem 1.3rem 1.4rem;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:1.05rem;color:var(--navy);margin-bottom:.4rem}
.card-body p{color:var(--gray);font-size:.9rem;flex:1}
.link-more{font-weight:700;color:var(--cyan);display:inline-block;margin-top:.7rem}
.group-title{color:var(--navy);margin:2.6rem 0 1.3rem;font-size:1.35rem;border-left:4px solid var(--cyan);padding-left:.8rem}
/* product detail */
.pdetail{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.pdetail-img img{border-radius:var(--radius);box-shadow:var(--shadow)}
.pdetail-info h1{color:var(--navy);font-size:clamp(1.6rem,3vw,2.3rem);margin-bottom:.8rem}
.pdetail-info .btn{margin-top:1.2rem}
.check-list{list-style:none;margin-top:1rem}
.check-list li{padding:.55rem 0 .55rem 2rem;position:relative;color:#33475b;border-bottom:1px dashed #dde6ee}
.check-list li::before{content:"✓";position:absolute;left:0;top:.5rem;color:var(--cyan);font-weight:800}
.pnav{display:flex;justify-content:space-between;padding:1.6rem 0;font-weight:600;flex-wrap:wrap;gap:1rem}
/* timeline */
.timeline{position:relative;max-width:680px;margin:0 auto;padding-left:2rem;border-left:3px solid var(--cyan)}
.tl-item{position:relative;padding-bottom:1.8rem}
.tl-item::before{content:"";position:absolute;left:-2.55rem;top:.4rem;width:1.1rem;height:1.1rem;border-radius:50%;background:#fff;border:3px solid var(--cyan)}
.tl-year{font-weight:800;color:var(--blue)}
.tl-text{color:var(--gray)}
/* apps */
.apps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem}
.app-item{background:#fff;border-radius:var(--radius);padding:1.3rem 1rem;text-align:center;font-weight:700;color:var(--navy);box-shadow:var(--shadow);border-bottom:3px solid var(--cyan)}
/* faq */
.faq-list details{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:1rem;overflow:hidden}
.faq-list summary{padding:1.1rem 1.4rem;font-weight:700;color:var(--navy);cursor:pointer;list-style:none;position:relative}
.faq-list summary::after{content:"+";position:absolute;right:1.3rem;color:var(--cyan);font-size:1.3rem;transition:.3s}
.faq-list details[open] summary::after{transform:rotate(45deg)}
.faq-list details p{padding:0 1.4rem 1.2rem;color:var(--gray)}
/* video */
.video-wrap video{width:100%;border-radius:var(--radius);box-shadow:var(--shadow);background:#000}
/* breadcrumb */
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem;font-size:.9rem;color:rgba(255,255,255,.85);margin-bottom:.6rem}
.section .breadcrumb ol{color:var(--gray);margin-bottom:1.4rem}
.breadcrumb li+li::before{content:"›";margin:0 .5rem;opacity:.6}
.section .breadcrumb a{color:var(--blue)}
.breadcrumb a{color:#fff}
/* CTA */
.cta-band{background:linear-gradient(110deg,var(--navy),#123a6b 60%,#0f6e8c);color:#fff;padding:3.4rem 0}
.cta-inner{text-align:center}
.cta-inner h2{font-size:clamp(1.4rem,2.6vw,2rem);margin-bottom:.6rem}
.cta-inner p{opacity:.9;margin-bottom:1.6rem}
/* footer */
.site-footer{background:#081a33;color:#c6d3e0;padding:3.4rem 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:2.4rem;padding-bottom:2.4rem}
.site-footer h3{color:#fff;font-size:1.05rem;margin-bottom:.9rem}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:.45rem}
.site-footer a{color:#c6d3e0}
.site-footer a:hover{color:#fff}
.copyright{border-top:1px solid rgba(255,255,255,.12);text-align:center;padding:1.2rem 0;font-size:.88rem;opacity:.75}
/* contact form */
.contact-form{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:2.2rem;margin-top:1.6rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem}
.form-group{margin-bottom:1.2rem}
.form-group label{display:block;font-weight:600;color:var(--navy);margin-bottom:.4rem;font-size:.94rem}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:.85rem 1rem;border:1.5px solid #d5e0ea;border-radius:10px;font:inherit;color:#1c2b3a;background:#fbfdfe;transition:.2s}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(22,163,184,.15)}
.form-status{margin-top:1rem;padding:1rem 1.2rem;border-radius:10px;display:none;font-weight:600}
.form-status.success{display:block;background:#e6f7ee;color:#0b7a3e;border:1px solid #b5e5c9}
.form-status.error{display:block;background:#fdecec;color:#b02a2a;border:1px solid #f3c1c1}
/* responsive */
@media(max-width:960px){
 .grid-4{grid-template-columns:repeat(2,1fr)}
 .grid-3,.apps-grid{grid-template-columns:repeat(2,1fr)}
 .footer-grid{grid-template-columns:1fr 1fr}
 .split,.pdetail{grid-template-columns:1fr}
 .nav-toggle{display:block}
 .main-nav{position:fixed;inset:64px 0 auto 0;background:#fff;flex-direction:column;padding:1rem 6%;box-shadow:0 14px 24px rgba(11,37,69,.12);transform:translateY(-130%);transition:.3s}
 .main-nav a{display:block;margin:.6rem 0;font-size:1.05rem}
 .main-nav.open{transform:translateY(0)}
 body.nav-open .nav-toggle span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
 body.nav-open .nav-toggle span:nth-child(2){opacity:0}
 body.nav-open .nav-toggle span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
}
@media(max-width:600px){
 .grid-4,.grid-3,.grid-2,.apps-grid,.form-row,.footer-grid{grid-template-columns:1fr}
 .hero-img{height:60vh}
 .section{padding:3rem 0}
 .btn-outline{margin-left:0;margin-top:.8rem}
 .btn{display:block;text-align:center}
 .hero .btn{max-width:280px;margin:0 auto .8rem}
}