:root{
  --ink:#14202b; --muted:#5a6b7a; --navy:#0d2f4a; --teal:#0e7c66; --teal-d:#0a5f4f;
  --bg:#ffffff; --soft:#f2f6f8; --line:#dde6ec; --amber:#e8a33d;
  --radius:10px; --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",system-ui,-apple-system,Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
a{color:var(--teal-d);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.topbar{background:var(--navy);color:#cfe0ec;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;gap:12px;padding-top:6px;padding-bottom:6px;flex-wrap:wrap}
.topbar a{color:#fff}
header.site{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;padding-top:14px;padding-bottom:14px;gap:16px;flex-wrap:wrap}
.brand{display:flex;flex-direction:column;line-height:1.25}
.brand .name{font-size:21px;font-weight:800;letter-spacing:.4px;color:var(--navy)}
.brand .name span{color:var(--teal)}
.brand .sub{font-size:12px;color:var(--muted)}
nav.main{display:flex;gap:22px;flex-wrap:wrap;align-items:center}
nav.main a{color:var(--ink);font-weight:600;font-size:15px}
nav.main a.active{color:var(--teal-d);border-bottom:2px solid var(--teal)}
nav.main a.lang{border:1px solid var(--line);border-radius:20px;padding:3px 12px;color:var(--teal-d)}
.btn{display:inline-block;background:var(--teal);color:#fff!important;padding:11px 22px;border-radius:8px;font-weight:700;border:0;cursor:pointer;font-size:15px}
.btn:hover{background:var(--teal-d);text-decoration:none}
.btn.ghost{background:#fff;color:var(--teal-d)!important;border:1.5px solid var(--teal)}
.btn.amber{background:var(--amber);color:#231600!important}
.btn.small{padding:7px 14px;font-size:13.5px}
.hero{background:linear-gradient(120deg,var(--navy) 0%,#114a5e 60%,#0e7c66 130%);color:#fff}
.hero .wrap{padding:64px 20px 56px}
.hero h1{font-size:38px;line-height:1.22;margin:0 0 14px;max-width:760px}
.hero p.lead{font-size:18px;color:#d7e7ef;max-width:680px;margin:0 0 26px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap}
.trust{background:var(--soft);border-bottom:1px solid var(--line)}
.trust .wrap{display:flex;gap:10px;flex-wrap:wrap;padding-top:14px;padding-bottom:14px}
.trust .item{flex:1 1 200px;font-size:14px;color:var(--navy);font-weight:600}
.trust .item small{display:block;color:var(--muted);font-weight:400}
section.block{padding:52px 0}
section.block.alt{background:var(--soft)}
h2.title{font-size:27px;color:var(--navy);margin:0 0 8px}
p.sub{color:var(--muted);margin:0 0 28px;max-width:760px}
.grid{display:grid;gap:18px}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
@media(max-width:860px){.grid.c3,.grid.c2{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{margin:0 0 8px;color:var(--navy);font-size:18px}
.card p{margin:0 0 12px;color:#374856;font-size:14.5px}
.card .tag{display:inline-block;background:#e6f3f0;color:var(--teal-d);border-radius:20px;padding:2px 10px;font-size:12px;font-weight:700;margin-bottom:10px}
.card .links{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
@media(max-width:860px){.steps{grid-template-columns:1fr 1fr}}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.step b{display:block;color:var(--teal-d);font-size:13px;letter-spacing:.6px}
.step h3{margin:4px 0 6px;font-size:16px;color:var(--navy)}
.step p{margin:0;font-size:14px;color:#374856}
.pagehead{background:var(--soft);border-bottom:1px solid var(--line)}
.pagehead .wrap{padding:38px 20px 30px}
.pagehead h1{margin:0 0 6px;color:var(--navy);font-size:30px}
.pagehead p{margin:0;color:var(--muted);max-width:760px}
.product{border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:18px;background:#fff}
.product h3{margin:0 0 4px;color:var(--navy);font-size:20px}
.product .app{color:var(--teal-d);font-weight:700;font-size:13px;letter-spacing:.5px;text-transform:uppercase}
.product ul{margin:8px 0 14px;padding-left:18px;color:#374856;font-size:14.5px}
.note{background:#fff8ec;border:1px solid #f0ddae;border-radius:var(--radius);padding:14px 18px;font-size:14px;color:#6b5518}
table.spec{border-collapse:collapse;width:100%;font-size:14.5px}
table.spec th,table.spec td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
table.spec th{background:var(--soft);color:var(--navy);width:220px}
form.inquiry{display:grid;gap:14px}
form.inquiry label{font-weight:600;font-size:14px;color:var(--navy)}
form.inquiry input,form.inquiry select,form.inquiry textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;font-size:14.5px;margin-top:4px}
form.inquiry .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:700px){form.inquiry .row{grid-template-columns:1fr}}
.form-msg{font-size:13.5px;color:var(--muted)}
.contact-cards{display:grid;gap:14px}
footer.site{background:var(--navy);color:#cfe0ec;margin-top:0}
footer.site .wrap{padding:36px 20px 28px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:26px}
@media(max-width:860px){footer.site .wrap{grid-template-columns:1fr}}
footer.site h4{color:#fff;margin:0 0 10px;font-size:15px}
footer.site a{color:#cfe0ec}
footer.site p,footer.site li{font-size:13.5px}
footer.site ul{list-style:none;margin:0;padding:0}
footer.site li{margin-bottom:6px}
.copyright{border-top:1px solid #1d4258;padding:14px 0;font-size:12.5px;color:#8fb0c4}
.float-wa{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:10px;z-index:30}
.float-wa a{display:flex;align-items:center;gap:8px;padding:10px 16px;border-radius:30px;color:#fff!important;font-weight:700;font-size:14px;box-shadow:0 4px 14px rgba(0,0,0,.25)}
.float-wa a.wa{background:#25d366}
.float-wa a.zalo{background:#0068ff}
.float-wa a:hover{text-decoration:none;filter:brightness(.95)}