:root{
  --navy:#071b2b;--navy-2:#0b2940;--teal:#138395;--teal-2:#1aa7b8;
  --cyan:#62d9e7;--magenta:#9b3157;--amber:#e8a735;--ink:#17212b;
  --muted:#536475;--line:#d6e0e6;--panel:#f2f7f9;--white:#fff;
  --shadow:0 18px 50px rgba(7,27,43,.11);--radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;background:#f7fafb;color:var(--ink);font:16px/1.72 "Segoe UI",Arial,sans-serif;-webkit-font-smoothing:antialiased}
body[data-lang="vi"] .lang-en,body[data-lang="en"] .lang-vi{display:none!important}
a{color:#0d7180;text-underline-offset:4px}a:hover{color:var(--magenta)}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}
.skip{position:absolute;top:-100px;left:16px;z-index:1000;background:#fff;color:var(--navy);padding:10px 14px;border-radius:6px}.skip:focus{top:10px}
.topbar{position:sticky;top:0;z-index:30;background:rgba(7,27,43,.97);border-bottom:1px solid rgba(98,217,231,.2);box-shadow:0 8px 22px rgba(7,27,43,.18)}
.top-inner{max-width:1500px;margin:auto;min-height:68px;padding:10px 30px;display:flex;align-items:center;justify-content:space-between;gap:22px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none;font-size:18px;font-weight:700;white-space:nowrap}.brand:hover{color:#fff}.brand img{width:66px;height:38px;object-fit:contain;background:#fff;border-radius:4px;padding:2px}.brand small{font-weight:400;color:#9ec7d0}
.top-actions{display:flex;align-items:center;gap:20px}.top-links{display:flex;flex-wrap:wrap;gap:20px;font-size:14px}.top-links a{color:#c9dce1;text-decoration:none;padding:6px 0}.top-links a:hover,.top-links a[aria-current="page"]{color:#fff;border-bottom:2px solid var(--cyan)}
.language{display:inline-flex;padding:3px;border:1px solid #315064;border-radius:7px;background:#092237}.language button{border:0;border-radius:5px;background:transparent;color:#a9c3cb;font-weight:700;padding:6px 9px;cursor:pointer}.language button.active{background:var(--teal);color:#fff}
.layout{max-width:1500px;margin:auto;display:grid;grid-template-columns:275px minmax(0,1fr)}
aside{position:sticky;top:68px;height:calc(100vh - 68px);overflow:auto;padding:30px 22px;background:#edf4f6;border-right:1px solid var(--line)}
.eyebrow{font:700 12px/1.5 Consolas,"Courier New",monospace;text-transform:uppercase;letter-spacing:1.8px;color:var(--teal)}
aside nav{display:grid;gap:3px;margin:18px 0 0}aside nav a{padding:9px 11px;text-decoration:none;font-size:14px;border-left:3px solid transparent;border-radius:5px;color:var(--muted)}aside nav a:hover,aside nav a[aria-current="location"]{background:#dcecef;border-left-color:var(--teal);color:var(--navy)}
.aside-note{font-size:13px;color:#6e7e8c;margin:26px 11px;padding-top:18px;border-top:1px solid var(--line)}
main{min-width:0;max-width:1160px;padding:34px 50px 72px}
.hero{position:relative;min-height:500px;border:0;margin:0;padding:62px 48px;display:flex;align-items:center;overflow:hidden;border-radius:var(--radius);background:var(--navy);box-shadow:var(--shadow);isolation:isolate}
.hero:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,27,43,.98) 0%,rgba(7,27,43,.9) 39%,rgba(7,27,43,.2) 70%,rgba(7,27,43,.06) 100%);z-index:-1}
.hero-media{position:absolute;inset:0;z-index:-2;width:100%;height:100%;object-fit:cover}
.hero-copy{max-width:545px;color:#fff}.hero .eyebrow{color:#70e1ec}.hero h1{font-size:clamp(38px,5vw,58px);line-height:1.05;letter-spacing:-1.4px;margin:14px 0 20px}.hero .lead{font-size:18px;line-height:1.65;color:#d5e7eb}.hero .meta{color:#a9c6cd}.hero .button{border-color:#4c6978;background:rgba(255,255,255,.07);color:#fff}.hero .button.primary{background:var(--teal);border-color:var(--teal)}
.status-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin:22px 0 0;background:var(--line);border:1px solid var(--line);border-radius:10px;overflow:hidden}.status{background:#fff;padding:18px}.status strong{display:block;color:var(--navy);font-size:15px}.status span{font-size:13px;color:var(--muted)}
h2{font-size:29px;line-height:1.25;margin:0 0 18px;color:var(--navy);letter-spacing:-.3px}h3{font-size:19px;line-height:1.4;margin:26px 0 10px;color:var(--navy)}p{margin:12px 0}.lead{font-size:18px;color:var(--muted);max-width:760px}.meta{font-size:14px;color:var(--muted)}
.actions{display:flex;flex-wrap:wrap;gap:11px;margin:24px 0}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;border:1px solid var(--line);border-radius:7px;background:#fff;text-decoration:none;font-weight:700;font-size:14px}.button.primary{background:var(--navy);border-color:var(--navy);color:#fff}
main>section{scroll-margin-top:92px;border-top:1px solid var(--line);margin-top:42px;padding-top:38px}.section-intro{max-width:780px;color:var(--muted)}
.icon-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:22px 0}.feature{position:relative;background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px;box-shadow:0 8px 28px rgba(7,27,43,.045)}.feature h3{margin:8px 0 5px}.feature p{margin:0;color:var(--muted);font-size:14px}.feature svg{width:32px;height:32px;color:var(--teal);stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.feature .tag{display:inline-block;margin-top:14px;color:var(--teal);font:700 11px/1.3 Consolas,monospace;text-transform:uppercase;letter-spacing:1px}
.diagram{margin:24px 0;background:linear-gradient(145deg,#071b2b,#0d3148);border-radius:12px;padding:28px;color:#fff;box-shadow:var(--shadow)}.diagram-title{font-size:13px;text-transform:uppercase;letter-spacing:1.4px;color:#80dce5;margin-bottom:20px}.flow{display:grid;grid-template-columns:repeat(7,minmax(30px,1fr));align-items:center;gap:8px}.flow.compact{grid-template-columns:repeat(5,minmax(30px,1fr))}.node{min-height:105px;padding:15px 10px;border:1px solid rgba(98,217,231,.32);border-radius:9px;background:rgba(255,255,255,.055);text-align:center;display:flex;flex-direction:column;justify-content:center;align-items:center}.node strong{font-size:14px;line-height:1.3}.node small{display:block;color:#a9c8d0;line-height:1.35;margin-top:6px}.node svg{width:30px;height:30px;margin-bottom:10px;color:var(--cyan);stroke:currentColor;fill:none;stroke-width:1.7}.arrow{color:var(--cyan);font-size:24px;text-align:center}.flow-note{color:#aec6cd;font-size:13px;margin:18px 0 0;text-align:center}
.steps{list-style:none;counter-reset:step;padding:0;margin:22px 0}.steps li{counter-increment:step;position:relative;padding:0 0 24px 52px;border-left:1px solid #c8dadd;margin-left:17px}.steps li:last-child{border-left-color:transparent}.steps li:before{content:counter(step,decimal-leading-zero);position:absolute;left:-17px;top:0;background:var(--teal);color:#fff;border:3px solid #f7fafb;border-radius:50%;width:34px;height:34px;text-align:center;font:700 12px/28px Consolas,monospace}.steps strong{display:block;color:var(--navy)}
.note{border-left:4px solid var(--teal);background:#e9f4f5;padding:15px 18px;margin:20px 0;border-radius:0 7px 7px 0}.note.warning{border-left-color:var(--amber);background:#fff6e5}.note strong{color:var(--navy)}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.card{border:1px solid var(--line);border-radius:10px;background:#fff;padding:20px}.card h3{margin-top:0}.card p{color:var(--muted)}
figure{margin:24px 0}figure img{display:block;max-width:100%;height:auto;border:1px solid var(--line);border-radius:9px;background:#fff;box-shadow:0 10px 30px rgba(7,27,43,.08)}figcaption{font-size:13px;color:var(--muted);margin-top:9px}.phones{display:flex;align-items:flex-start;gap:20px}.phones figure{flex:1;min-width:0}.phones img{max-height:540px;width:auto;margin:auto}
.table-wrap{overflow:auto;margin:20px 0;border:1px solid var(--line);border-radius:9px;background:#fff}table{width:100%;border-collapse:collapse;text-align:left;min-width:620px}th{background:#eaf3f5;color:var(--navy);font-size:14px}th,td{padding:13px 15px;border-bottom:1px solid var(--line);vertical-align:top}tr:last-child td{border-bottom:0}td:first-child{font-weight:600;color:var(--navy)}
.badge{display:inline-block;padding:3px 8px;border-radius:99px;background:#e2f3f5;color:#086a77;font:700 11px/1.4 Consolas,monospace;text-transform:uppercase}.badge.conditional{background:#fff0d4;color:#7e5400}
.checklist{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:0;list-style:none}.checklist li{background:#fff;border:1px solid var(--line);border-radius:8px;padding:13px 14px 13px 43px;position:relative}.checklist li:before{content:"✓";position:absolute;left:14px;top:12px;width:21px;height:21px;border-radius:50%;background:#daf0ec;color:#086a67;text-align:center;font-weight:800;line-height:21px}
details{padding:15px 0;border-bottom:1px solid var(--line)}summary{font-weight:700;cursor:pointer;color:var(--navy)}
footer{border-top:1px solid var(--line);margin-top:42px;padding-top:22px;font-size:14px;color:var(--muted)}
.hub-shell{max-width:1240px;margin:auto;padding:48px 28px 70px}.hub-header{max-width:800px;margin-bottom:32px}.hub-header h1{font-size:clamp(38px,6vw,68px);line-height:1.02;letter-spacing:-2px;margin:12px 0 18px;color:var(--navy)}.hub-header p{font-size:18px;color:var(--muted)}.hub-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.hub-card{position:relative;min-height:520px;display:flex;align-items:flex-end;overflow:hidden;border-radius:var(--radius);background:var(--navy);box-shadow:var(--shadow);isolation:isolate}.hub-card:after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(0deg,rgba(7,27,43,.98),rgba(7,27,43,.28) 74%)}.hub-card>img{position:absolute;inset:0;z-index:-2;width:100%;height:100%;object-fit:cover}.hub-card-copy{padding:30px;color:#fff}.hub-card h2{color:#fff;font-size:34px;margin:8px 0}.hub-card p{color:#d4e4e8;max-width:530px}.hub-card .button{color:#fff;border-color:#5b7683;background:rgba(7,27,43,.55)}.hub-foot{margin-top:28px;color:var(--muted);font-size:14px}
@media(max-width:1050px){.layout{grid-template-columns:235px minmax(0,1fr)}main{padding:28px}.icon-grid{grid-template-columns:1fr 1fr}.hero{min-height:470px;padding:45px 35px}.hero-copy{max-width:480px}}
@media(max-width:760px){.top-inner{align-items:flex-start;flex-wrap:wrap;padding:10px 18px}.top-actions{width:100%;justify-content:space-between}.top-links{gap:13px}.layout{display:block}aside{position:static;height:auto;padding:18px;border-right:0;border-bottom:1px solid var(--line)}aside nav{grid-template-columns:1fr 1fr;margin-top:10px}.aside-note{display:none}main{padding:22px 16px}.hero{min-height:520px;padding:34px 24px;align-items:flex-end}.hero:after{background:linear-gradient(0deg,rgba(7,27,43,.98) 0%,rgba(7,27,43,.88) 55%,rgba(7,27,43,.16) 100%)}.hero h1{font-size:38px}.status-strip,.grid,.checklist,.hub-grid{grid-template-columns:1fr}.icon-grid{grid-template-columns:1fr}.flow,.flow.compact{grid-template-columns:1fr}.arrow{transform:rotate(90deg)}.phones{gap:10px}.phones img{max-height:440px}.hub-shell{padding:34px 16px 56px}.hub-card{min-height:440px}}
@media(max-width:480px){aside nav{grid-template-columns:1fr}.top-links{font-size:13px}.brand small{display:none}.language button{padding:5px 7px}.phones{display:block}.hero{min-height:560px}.hero .actions{display:grid}.button{width:100%}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.topbar,aside,.actions,.skip{display:none!important}.layout{display:block}main{max-width:none;padding:0}.hero{min-height:300px;box-shadow:none}.hero:after{background:rgba(7,27,43,.83)}body{background:#fff;font-size:10pt}.feature,.diagram,.node,.note,figure,.steps li{break-inside:avoid}h2,h3{break-after:avoid}main>section{break-before:auto}.diagram{background:#102c40!important;-webkit-print-color-adjust:exact;print-color-adjust:exact}}