:root{--blue:#1B5CFF;--cy:#22D3EE;--ink:#0F1B33;--ink2:#44506B;--mut:#7A86A3;--line:#E4E9F4;--bg:#F6F8FD;--card:#fff;--r:16px}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Be Vietnam Pro',system-ui,-apple-system,sans-serif;color:var(--ink);background:#fff;line-height:1.75;font-size:16.5px}
.topbar{background:#0A1633;color:#fff;font-size:13px;padding:8px 0;text-align:center}
.topbar a{color:var(--cy);text-decoration:none;font-weight:600}
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-in{max-width:1100px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between}
.logo{font-weight:800;font-size:19px;color:var(--ink);text-decoration:none}
.logo b{color:var(--blue)}
.nav-links{display:flex;gap:22px}
.nav-links a{color:var(--ink2);text-decoration:none;font-size:14.5px;font-weight:500}
.nav-links a:hover{color:var(--blue)}
.hero-art{background:linear-gradient(135deg,#0A1633 0%,#12275c 60%,#1B5CFF 100%);color:#fff;padding:64px 20px 56px}
.hero-in{max-width:800px;margin:0 auto}
.crumb{font-size:13px;color:#A9B4CC;margin-bottom:16px}
.crumb a{color:#A9B4CC;text-decoration:none}.crumb a:hover{color:#fff}
h1.atitle{font-size:clamp(28px,4vw,42px);line-height:1.25;font-weight:800;letter-spacing:-.5px;margin-bottom:16px}
.ameta{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:13.5px;color:#A9B4CC;margin-top:18px}
.ameta b{color:#fff;font-weight:600}
.wrap{max-width:800px;margin:0 auto;padding:44px 20px 20px}
.toc{background:var(--bg);border:1px solid var(--line);border-radius:var(--r);padding:22px 26px;margin:0 0 36px}
.toc b{display:block;margin-bottom:10px;font-size:15px}
.toc ol{margin-left:20px;font-size:14.5px}
.toc li{margin:5px 0}
.toc a{color:var(--ink2);text-decoration:none}
.toc a:hover{color:var(--blue)}
.wrap h2{font-size:24px;font-weight:800;letter-spacing:-.3px;margin:44px 0 16px;padding-top:8px}
.wrap h3{font-size:18px;font-weight:700;margin:28px 0 12px}
.wrap p{margin:0 0 16px;color:#24304d}
.wrap ul,.wrap ol{margin:0 0 18px 22px;color:#24304d}
.wrap li{margin:7px 0}
.defbox{background:linear-gradient(135deg,#EFF4FF,#E6FBFF);border-left:4px solid var(--blue);border-radius:0 14px 14px 0;padding:20px 24px;margin:24px 0;font-size:17px}
.defbox b{color:var(--blue)}
table.cmp{width:100%;border-collapse:collapse;margin:20px 0;font-size:14.5px;background:#fff}
.cmp th,.cmp td{border:1px solid var(--line);padding:12px 14px;text-align:left;vertical-align:top}
.cmp th{background:#0A1633;color:#fff;font-weight:700;font-size:13.5px}
.cmp tr:nth-child(even) td{background:#F8FAFF}
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:22px 0}
.stat{background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:18px 20px}
.stat .n{font-size:30px;font-weight:800;color:var(--blue);line-height:1.2}
.stat .t{font-size:13.5px;color:var(--ink2);margin-top:4px}
.warn{background:#FFF8E6;border:1px solid #F5D97A;border-radius:14px;padding:18px 22px;margin:24px 0;font-size:15px}
.warn b{color:#8a6d00}
.cta-box{background:linear-gradient(135deg,#1B5CFF,#0A1633);border-radius:20px;padding:36px 32px;text-align:center;color:#fff;margin:48px 0}
.cta-box h3{color:#fff;font-size:22px;margin:0 0 10px}
.cta-box p{color:#C9D6F5;font-size:15px;margin-bottom:20px}
.btn{display:inline-block;background:#fff;color:var(--blue);font-weight:700;padding:14px 32px;border-radius:999px;text-decoration:none;font-size:16px}
.btn.ghost{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.5);margin-left:10px}
.faq{margin:20px 0}
.faq-item{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;overflow:hidden}
.faq-q{width:100%;background:#fff;border:0;padding:16px 20px;font-size:15.5px;font-weight:700;text-align:left;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-family:inherit;color:var(--ink)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a p{padding:0 20px 18px;font-size:15px;color:var(--ink2)}
.faq-item.open .faq-a{max-height:400px}
.faq-item .pl{color:var(--blue);font-size:20px;font-weight:400}
.rel{background:var(--bg);border-radius:var(--r);padding:26px 28px;margin:40px 0}
.rel b.t{display:block;margin-bottom:12px}
.rel a{display:block;color:var(--blue);text-decoration:none;font-weight:600;font-size:15.5px;margin:8px 0}
.rel a:hover{text-decoration:underline}
.rel span.d{color:var(--mut);font-weight:400;font-size:13.5px}
footer.site{background:#0A1633;color:#A9B4CC;padding:44px 20px;font-size:14px}
.foot-in{max-width:1100px;margin:0 auto;display:flex;flex-wrap:wrap;gap:20px 40px;justify-content:space-between}
.foot-in a{color:#A9B4CC;text-decoration:none}
.foot-in a:hover{color:#fff}
.sticky-cta{display:none}
@media(max-width:640px){
.stat-grid{grid-template-columns:1fr}
.nav-links{display:none}
.wrap{font-size:16px}
.sticky-cta{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:60;background:#fff;border-top:1px solid var(--line);padding:10px 14px;gap:10px}
.sticky-cta a{flex:1;text-align:center;padding:12px;border-radius:12px;font-weight:700;text-decoration:none;font-size:15px}
.sticky-cta .call{background:var(--blue);color:#fff}
.sticky-cta .zalo{background:#E8F0FF;color:var(--blue)}
body{padding-bottom:66px}
}