:root{
  --page:#F9F7F2;--surface:#FFFFFF;--surface-2:#F1EEE6;
  --navy:#13294B;--navy-2:#1E3A64;--ink:#1B2533;--muted:#58626F;
  --gold:#A4803A;--gold-soft:#EFE5CF;--line:#E2DDD1;--focus:#2D6CDF;--on-navy:#F6F3EC;
  --serif:"Playfair Display",Georgia,"Times New Roman",serif;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --wrap:1180px;--read:760px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --page:#0F1724;--surface:#162133;--surface-2:#1B2840;--navy:#C9D6EA;--navy-2:#DCE5F2;
  --ink:#E8ECF2;--muted:#A6B0BE;--gold:#D3B26E;--gold-soft:#3A3322;--line:#2A3850;--on-navy:#0F1724}}
:root[data-theme="dark"]{
  --page:#0F1724;--surface:#162133;--surface-2:#1B2840;--navy:#C9D6EA;--navy-2:#DCE5F2;
  --ink:#E8ECF2;--muted:#A6B0BE;--gold:#D3B26E;--gold-soft:#3A3322;--line:#2A3850;--on-navy:#0F1724}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--page);color:var(--ink);font:400 17px/1.7 var(--sans);-webkit-text-size-adjust:100%;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:4px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.read{max-width:var(--read)}
h1,h2,h3{font-family:var(--serif);color:var(--navy);font-weight:600;line-height:1.22;margin:0;text-wrap:balance}
h1{font-size:clamp(34px,4.6vw,54px)}
h2{font-size:clamp(25px,2.8vw,32px);margin:56px 0 16px}
h3{font-size:20px;margin:28px 0 8px}
p{margin:0 0 14px}
.skip{position:absolute;left:-999px;top:8px;background:var(--navy);color:var(--on-navy);padding:8px 14px;z-index:100}
.skip:focus{left:8px}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:12px 22px;border-radius:999px;font:600 16px/1.2 var(--sans);text-decoration:none;cursor:pointer;border:1.5px solid transparent}
.btn svg{width:20px;height:20px;flex:none}
.btn-zalo{background:var(--navy);color:var(--on-navy)}
.btn-zalo:hover{background:var(--navy-2)}
.btn-line{border-color:var(--navy);color:var(--navy);background:transparent}
.btn-line:hover{background:var(--surface-2)}

/* Header */
.site-head{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--page) 92%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.head-in{display:flex;align-items:center;justify-content:space-between;height:72px;gap:20px}
.brand{text-decoration:none;display:flex;flex-direction:column;line-height:1.1}
.brand b{font-family:var(--serif);font-size:22px;color:var(--navy);font-weight:700}
.brand span{font-size:12.5px;color:var(--muted);margin-top:3px}
.nav{display:flex;gap:24px;align-items:center}
.nav a{text-decoration:none;font-size:15px;font-weight:500;color:var(--ink)}
.nav a:hover,.nav a[aria-current]{color:var(--gold)}
.nav a.btn-zalo{color:var(--on-navy)}
.nav .btn{min-height:42px;padding:9px 18px;font-size:15px}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:10px;width:46px;height:44px;cursor:pointer;color:var(--navy)}
.menu-btn svg{width:22px;height:22px}
@media (max-width:960px){
  .menu-btn{display:inline-flex;align-items:center;justify-content:center}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--page);flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 20px;border-bottom:1px solid var(--line)}
  .nav.open{display:flex}
  .nav a{padding:14px 0;border-bottom:1px solid var(--line)}
  .nav .btn{margin-top:14px;border-bottom:0}
}

/* Page */
.crumbs{font-size:14px;color:var(--muted);padding-top:28px}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.crumbs li+li::before{content:"/";margin-right:6px;color:var(--line)}
.crumbs a{text-decoration:none}
.crumbs a:hover{color:var(--gold)}
.page-hero{padding:28px 0 8px}
.eyebrow{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--gold);font-weight:600;margin-bottom:14px}
.page-hero .lead{font-size:19px;color:var(--muted);margin-top:18px;max-width:62ch}
.page-hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.meta{font-size:14px;color:var(--muted);margin-top:14px}
main{padding-bottom:72px}
.content ul,.content ol{padding-left:22px;margin:0 0 16px}
.content li{margin-bottom:8px}
.content a{color:var(--navy);text-decoration-color:var(--gold);text-underline-offset:3px}
.callout{border-left:3px solid var(--gold);padding:6px 0 6px 18px;margin:22px 0;font-family:var(--serif);font-style:italic;font-size:20px;color:var(--navy)}
.box{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px 26px;margin:20px 0}
.box h3{margin-top:0}
.checks{list-style:none;padding:0!important}
.checks li{position:relative;padding:6px 0 6px 28px;border-bottom:1px dashed var(--line);margin:0!important}
.checks li:last-child{border-bottom:0}
.checks li::before{content:"";position:absolute;left:4px;top:15px;width:10px;height:5px;border-left:2px solid var(--gold);border-bottom:2px solid var(--gold);transform:rotate(-45deg)}
.steps{counter-reset:s;list-style:none;padding:0!important}
.steps li{counter-increment:s;position:relative;padding:4px 0 4px 44px;margin-bottom:10px!important}
.steps li::before{content:counter(s);position:absolute;left:0;top:2px;width:30px;height:30px;border-radius:50%;background:var(--gold-soft);color:var(--navy);font-weight:600;font-size:14px;display:flex;align-items:center;justify-content:center}
.experts{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin:16px 0}
.expert{display:flex;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px}
.expert img{width:64px;height:64px;border-radius:50%;object-fit:cover;object-position:center 15%;flex:none}
.expert b{display:block;color:var(--navy);font-family:var(--serif);font-size:17px;line-height:1.3}
.expert span{font-size:14px;color:var(--muted);line-height:1.45;display:block}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;margin:20px 0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px 24px;text-decoration:none;display:flex;flex-direction:column}
.card:hover{border-color:var(--gold)}
.card h2,.card h3{font-size:21px;margin:0 0 8px}
.card p{color:var(--muted);font-size:15.5px;flex:1}
.card .more{font-weight:600;color:var(--gold);font-size:15px}
details.acc{border-bottom:1px solid var(--line)}
details.acc summary{list-style:none;cursor:pointer;padding:16px 36px 16px 0;position:relative;font-family:var(--serif);font-size:19px;font-weight:600;color:var(--navy)}
details.acc summary::-webkit-details-marker{display:none}
details.acc summary::after{content:"";position:absolute;right:6px;top:50%;width:10px;height:10px;border-right:2px solid var(--gold);border-bottom:2px solid var(--gold);transform:translateY(-70%) rotate(45deg);transition:transform .2s}
details.acc[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
details.acc .body{padding:0 0 16px;color:var(--ink)}
.cta-box{background:var(--navy);color:var(--on-navy);border-radius:20px;padding:34px 32px;margin:56px 0 0}
.cta-box h2{color:var(--on-navy);margin:0 0 10px}
.cta-box p{color:color-mix(in srgb,var(--on-navy) 82%,transparent)}
.cta-box .btn{background:var(--gold);color:#13294B;margin-top:8px}
.cta-box .btn:hover{filter:brightness(1.06)}
.about-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:48px;align-items:start}
.about-grid figure{margin:0}
.about-grid figure img{border-radius:160px 160px 16px 16px;aspect-ratio:4/5;object-fit:cover;object-position:center 0;background:#13294B}
@media (max-width:860px){.about-grid{grid-template-columns:1fr}.about-grid figure{max-width:300px;order:-1}}

/* Footer */
footer{border-top:1px solid var(--line);padding:44px 0 48px;font-size:14.5px;color:var(--muted);margin-top:24px}
.foot{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:28px}
.foot .brand b{font-size:20px}
.foot h2{font-family:var(--sans);font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--navy);margin:0 0 10px}
.foot ul{list-style:none;margin:0;padding:0}
.foot li{margin-bottom:6px}
.foot a{text-decoration:none}
.foot a:hover{color:var(--gold)}
.foot .contact{margin-top:14px}
@media (max-width:760px){.foot{grid-template-columns:1fr}footer{padding-bottom:110px}}

/* Mobile bar */
.mbar{display:none}
@media (max-width:760px){
  .mbar{display:flex;gap:10px;position:fixed;left:0;right:0;bottom:0;z-index:60;padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));background:color-mix(in srgb,var(--page) 94%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-top:1px solid var(--line)}
  .mbar .btn-zalo{flex:1}
  .mbar .btn-line{flex:none}
}

/* Lead-gen additions */
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px 20px;margin-top:8px}
.cta-row .btn{margin-top:0}
.cta-box .cta-alt{color:color-mix(in srgb,var(--on-navy) 85%,transparent);font-size:15px;text-decoration-color:var(--gold)}
@media (max-width:760px){.mbar .mico{flex:none;width:48px;padding:0}}

/* Article tables & sources */
.tbl-wrap{overflow-x:auto;margin:18px 0 22px;border:1px solid var(--line);border-radius:12px}
.tbl{width:100%;border-collapse:collapse;font-size:15.5px;background:var(--surface)}
.tbl th,.tbl td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:var(--surface-2);color:var(--navy);font-weight:600}
.tbl tr:last-child td{border-bottom:0}
.sources{font-size:14.5px}
.content h3{margin-top:26px}