*{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#165DFF;--primary-dark:#0F48C9;--dark:#0F172A;--gray:#475569;
  --light:#F8FAFC;--white:#FFF;--border:#E2E8F0;--shadow:0 10px 30px rgba(15,23,42,.08);
  --wa:#25D366;--wa-dark:#1EBE5D;
}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI","Helvetica Neue",Arial,sans-serif;color:var(--dark);background:var(--light);line-height:1.6}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
img{display:block;max-width:100%}

/* Header */
header{background:rgba(255,255,255,.95);backdrop-filter:saturate(180%) blur(10px);position:sticky;top:0;z-index:99;box-shadow:0 1px 12px rgba(15,23,42,.06)}
.nav-wrap{display:flex;justify-content:space-between;align-items:center;height:72px;gap:16px}
.logo{font-size:22px;font-weight:800;letter-spacing:.5px;color:var(--primary);text-decoration:none;white-space:nowrap}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:var(--dark);text-decoration:none;font-weight:600;font-size:15px;transition:color .2s}
.nav-links a:hover{color:var(--primary)}
.lang-select{padding:8px 12px;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--dark);font-weight:600;cursor:pointer}
.cta-btn{background:var(--primary);color:#fff;padding:11px 22px;border-radius:8px;text-decoration:none;font-weight:700;font-size:15px;border:none;cursor:pointer;transition:background .2s,transform .2s}
.cta-btn:hover{background:var(--primary-dark);transform:translateY(-1px)}
.mobile-menu{display:none;font-size:26px;cursor:pointer;background:none;border:none;color:var(--dark);line-height:1;padding:4px 8px}

/* Hero */
.hero{background:radial-gradient(circle at top right,rgba(22,93,255,.25),transparent 45%),linear-gradient(135deg,#0B1220 0%,#111C44 100%);color:#fff;padding:88px 0;overflow:hidden}
.hero .container{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:42px;line-height:1.15;margin-bottom:20px;font-weight:800}
.hero p{font-size:18px;color:#CBD5E1;margin-bottom:32px;max-width:560px}
.hero-buttons{display:flex;gap:16px;flex-wrap:wrap}
.btn-outline{border:1px solid rgba(255,255,255,.4);color:#fff;padding:11px 22px;border-radius:8px;text-decoration:none;font-weight:700;background:transparent;transition:background .2s}
.btn-outline:hover{background:rgba(255,255,255,.1)}
.hero-img{width:100%;border-radius:16px;box-shadow:0 30px 60px rgba(0,0,0,.35);aspect-ratio:4/3;object-fit:cover}

/* Trust bar */
.trust-bar{background:#0F172A;border-bottom:1px solid rgba(255,255,255,.08)}
.trust-items{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 28px;padding:14px 0}
.trust-item{display:flex;align-items:center;gap:9px;color:#CBD5E1;font-size:13.5px;font-weight:600}
.trust-item .dot{width:8px;height:8px;border-radius:50%;background:var(--wa);flex:0 0 8px}

/* Section */
.section{padding:76px 0}
.section-header{text-align:center;margin-bottom:44px}
.section-title{font-size:32px;color:var(--dark);margin-bottom:12px;font-weight:800}
.section-sub{color:var(--gray);font-size:17px;max-width:720px;margin:0 auto}

/* Products */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.product-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s;display:flex;flex-direction:column}
.product-card:hover{transform:translateY(-6px);box-shadow:0 20px 40px rgba(15,23,42,.12)}
.product-img{width:100%;height:210px;object-fit:cover;border-bottom:1px solid var(--border)}
.product-body{padding:22px;flex:1;display:flex;flex-direction:column}
.product-card h3{font-size:19px;color:var(--primary);margin-bottom:10px;font-weight:800}
.product-card p{color:var(--gray);margin-bottom:14px;font-size:14.5px;flex:1}
.product-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.tag{background:#EEF4FF;color:#165DFF;font-size:12px;font-weight:700;padding:5px 10px;border-radius:999px}
.product-links{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.product-link{color:var(--primary);font-weight:700;text-decoration:none;display:inline-flex;align-items:center;gap:6px;font-size:15px}
.product-link:hover{color:var(--primary-dark)}
.product-link.detail{border-bottom:2px solid var(--primary);padding-bottom:1px}
.cta-card{background:linear-gradient(160deg,#0B1220,#14245E);color:#fff;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;padding:32px;min-height:340px}
.cta-card h3{color:#fff;font-size:21px;margin-bottom:12px}
.cta-card p{color:#CBD5E1;margin-bottom:20px;font-size:15px;flex:initial}
.cta-card .cta-btn{align-self:flex-start}

/* Why Us */
.why-us{background:#fff}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:36px}
.feature-card{background:var(--light);border:1px solid var(--border);border-radius:16px;padding:26px;transition:transform .3s}
.feature-card:hover{transform:translateY(-4px)}
.feature-icon{width:48px;height:48px;border-radius:12px;background:#EEF4FF;color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.feature-card h4{font-size:17px;margin-bottom:10px;font-weight:800}
.feature-card p{color:var(--gray);font-size:14px}

/* About */
.about-wrap{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.about-text h3{font-size:26px;margin-bottom:16px;font-weight:800}
.about-text p{color:var(--gray);margin-bottom:16px;font-size:16px}
.about-list{list-style:none;margin-top:16px}
.about-list li{padding-left:28px;position:relative;margin-bottom:10px;color:var(--dark);font-weight:600}
.about-list li::before{content:"";position:absolute;left:0;top:6px;width:14px;height:14px;border-radius:4px;background:#EEF4FF;border:2px solid var(--primary)}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:24px}
.stat{background:var(--light);border:1px solid var(--border);border-radius:14px;padding:20px;text-align:center}
.stat-num{font-size:30px;font-weight:800;color:var(--primary)}
.stat-label{color:var(--gray);font-size:13.5px;margin-top:4px}

/* FAQ */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--border);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq-item summary{padding:16px 20px;font-weight:700;color:var(--dark);cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:20px;color:var(--primary);font-weight:800;flex:0 0 auto}
.faq-item[open] summary::after{content:"–"}
.faq-item p{padding:0 20px 18px;color:var(--gray);font-size:15px}

/* Contact */
.contact{background:linear-gradient(180deg,#fff 0%,#EEF4FF 100%)}
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:40px;align-items:start}
.contact-info{background:linear-gradient(135deg,#0B1220,#111C44);color:#fff;padding:34px;border-radius:16px}
.contact-info h3{font-size:23px;margin-bottom:14px}
.contact-info p{color:#CBD5E1;margin-bottom:18px}
.contact-info ul{list-style:none}
.contact-info li{margin-bottom:14px;font-weight:600;display:flex;gap:12px;align-items:flex-start}
.contact-info a{color:#7EA8FF;text-decoration:none}
.contact-info a:hover{text-decoration:underline}
.form-wrap{background:#fff;padding:34px;border-radius:16px;box-shadow:var(--shadow)}
.form-row{margin-bottom:18px}
.form-row label{display:block;margin-bottom:8px;font-weight:700;color:var(--dark)}
.form-row input,.form-row textarea{width:100%;padding:13px 14px;border:1px solid var(--border);border-radius:10px;font-size:15px;background:#fff;transition:border-color .2s,box-shadow .2s}
.form-row input:focus,.form-row textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px rgba(22,93,255,.12)}
textarea{min-height:120px;resize:vertical}
.submit-btn{background:var(--primary);color:#fff;border:none;padding:13px 28px;border-radius:10px;font-weight:800;font-size:16px;cursor:pointer;transition:background .2s,transform .2s}
.submit-btn:hover{background:var(--primary-dark);transform:translateY(-1px)}
.msg-success{color:#22c55e;display:none;margin-top:12px;font-weight:600}
.msg-error{color:#ef4444;display:none;margin-top:12px;font-weight:600;font-size:14px}
.msg-error a{color:var(--wa);font-weight:700}
.hp-wrap{position:absolute;left:-9999px;top:-9999px;opacity:0;height:0;overflow:hidden}

/* Footer */
footer{background:var(--dark);color:#CBD5E1;padding:52px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;margin-bottom:30px}
footer h4{color:#fff;font-size:17px;margin-bottom:14px;font-weight:800}
footer p,footer a{font-size:14px;color:#CBD5E1;text-decoration:none}
footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:22px;text-align:center;color:#94A3B8;font-size:13px}

/* WhatsApp float */
.wa-float{position:fixed;right:18px;bottom:18px;z-index:9999;background:var(--wa);color:#fff;padding:12px 20px;border-radius:30px;font-weight:700;text-decoration:none;box-shadow:0 4px 14px rgba(0,0,0,.35);display:flex;align-items:center;gap:8px;font-size:15px;transition:background .2s}
.wa-float:hover{background:var(--wa-dark);color:#fff}
.wa-float svg{width:22px;height:22px;flex:0 0 auto}

/* Product detail page */
.breadcrumb{font-size:13px;color:var(--gray);margin-bottom:20px}
.breadcrumb a{color:var(--primary);text-decoration:none}
.pd-hero{padding:52px 0 40px}
.pd-title{font-size:34px;font-weight:800;margin-bottom:12px;color:var(--dark)}
.pd-sub{color:var(--gray);font-size:16.5px;max-width:760px;margin-bottom:22px}
.pd-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start}
.pd-img{width:100%;border-radius:16px;box-shadow:var(--shadow);object-fit:cover}
.spec-table{width:100%;border-collapse:collapse;font-size:14px;background:#fff;border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}
.spec-table th{background:var(--dark);color:#fff;text-align:left;padding:12px 16px;font-size:13.5px}
.spec-table td{padding:11px 16px;border-bottom:1px solid var(--border);vertical-align:top}
.spec-table tr:last-child td{border-bottom:none}
.spec-table td:first-child{color:var(--gray);font-weight:600;width:38%}
.spec-table td:last-child{color:var(--dark);font-weight:700}
.pd-features{list-style:none;margin:18px 0 0}
.pd-features li{padding-left:28px;position:relative;margin-bottom:10px;color:var(--gray);font-weight:600}
.pd-features li::before{content:"✓";position:absolute;left:0;top:0;color:var(--primary);font-weight:800}
.cta-strip{background:linear-gradient(135deg,#0B1220,#14245E);border-radius:16px;color:#fff;padding:28px 32px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;margin-top:44px}
.cta-strip h3{font-size:21px;margin-bottom:6px}
.cta-strip p{color:#CBD5E1;font-size:14.5px}
.cta-strip .cta-btn{flex:0 0 auto}

/* Language */
.en,.vi{display:none}
.en.active,.vi.active{display:block}

/* Responsive */
@media (max-width:980px){
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .about-wrap{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero .container{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .pd-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .nav-links{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;gap:4px;padding:10px 24px 18px;box-shadow:0 12px 24px rgba(15,23,42,.12);border-top:1px solid var(--border)}
  .nav-links.open{display:flex}
  .nav-links a{display:block;width:100%;padding:11px 0;font-size:16px;border-bottom:1px solid #F1F5F9}
  .nav-links .cta-btn{width:100%;text-align:center;margin-top:10px}
  .lang-select{width:100%;margin-top:8px}
  .mobile-menu{display:block}
  .product-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero{padding:64px 0}
  .hero h1{font-size:27px}
  .section{padding:60px 0}
  .stats{grid-template-columns:1fr 1fr}
  .trust-items{justify-content:flex-start}
  .wa-float{right:12px;bottom:12px;padding:11px 16px;font-size:14px}
}