:root{--bg:#f6f3ec;--card:#fff;--ink:#14212b;--mut:#5b6872;--pri:#2160c4;--deep:#0b1d3d;--acc:#dcb766;--acc2:#b8892f;--ln:#e4ddcf;--red:#c0392b}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{margin:0;font:16.5px/1.7 'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',sans-serif;background:var(--bg);color:var(--ink)}
a{color:var(--pri)}img{max-width:100%;height:auto}
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;z-index:99;background:#fff;padding:8px 12px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.top{background:var(--deep);color:#e8eef8;font-size:13px;text-align:center;padding:6px 10px}
.hd{background:var(--card);border-bottom:1px solid var(--ln);position:sticky;top:0;z-index:20}
.hd-in{display:flex;align-items:center;gap:22px;height:66px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:21px;letter-spacing:.5px;color:var(--deep);text-decoration:none;line-height:1.1}
.logo svg{width:34px;height:34px;flex:none}.logo small{display:block;font-size:10px;font-weight:600;letter-spacing:2.5px;color:var(--acc2)}
.nav{margin-left:auto}.nav ul{display:flex;gap:20px;list-style:none;margin:0;padding:0}.nav a{font-weight:600;font-size:15px;color:var(--ink);text-decoration:none}.nav a:hover,.nav .current-menu-item a{color:var(--pri)}
.nav-btn{display:none;margin-left:auto;background:none;border:1px solid var(--ln);border-radius:10px;font-size:22px;width:44px;height:40px;cursor:pointer}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;padding:12px 20px;font-weight:700;font-size:15px;border:0;cursor:pointer;text-decoration:none;line-height:1.2}
.btn-pri{background:linear-gradient(180deg,var(--acc),var(--acc2));color:#1d1404;box-shadow:0 6px 18px rgba(184,137,47,.35)}
.btn-ghost{border:1.5px solid currentColor;color:inherit}
.pending{position:relative}.pending:after{content:"Đang cập nhật";position:absolute;top:-10px;right:-8px;background:var(--red);color:#fff;font-size:10.5px;padding:2px 7px;border-radius:20px;font-weight:700;line-height:1.4}
/* hero */
.hero{background:radial-gradient(1200px 500px at 85% 0%,rgba(255,255,255,.08),transparent),linear-gradient(135deg,#0b1d3d,#1a4a9c);color:#fff}
.hero-g{display:grid;grid-template-columns:1.05fr 1fr;gap:36px;align-items:center;padding:46px 18px 60px}
.kick{display:inline-block;font-size:13px;font-weight:600;padding:5px 12px;border-radius:30px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22)}
.hero h1{font-size:40px;line-height:1.2;margin:14px 0;font-weight:800;letter-spacing:-.4px}.hero h1 em{font-style:normal;color:var(--acc)}
.hero p{font-size:17px;opacity:.92;max-width:560px;margin:0}.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.hero-i img{width:100%;border-radius:22px;box-shadow:0 30px 60px rgba(0,0,0,.35);aspect-ratio:16/10;object-fit:cover;display:block}
.facts{display:flex;gap:24px;margin-top:22px;font-size:14px;opacity:.92;flex-wrap:wrap}.facts b{display:block;font-size:20px;color:var(--acc)}
.quick{margin-top:-32px;position:relative}.quick-g{display:grid;grid-template-columns:repeat(7,1fr);gap:10px;background:var(--card);border-radius:18px;padding:12px;box-shadow:0 12px 30px rgba(20,33,43,.09);border:1px solid var(--ln)}
.q{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 6px;border-radius:12px;font-weight:600;font-size:14px;text-align:center;color:var(--ink);text-decoration:none}.q:hover{background:var(--bg)}
.q i{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;font-style:normal;font-size:20px;background:#e6eefb;color:var(--pri)}
.sec{padding:56px 0 0}.sh{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:20px}
.sec h2,.sh h2{font-size:28px;margin:0;line-height:1.25}.sh p{margin:6px 0 0;color:var(--mut)}.more{font-weight:700;white-space:nowrap;text-decoration:none}
.cats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.cat{background:var(--card);border:1px solid var(--ln);border-radius:18px;overflow:hidden;transition:transform .2s,box-shadow .2s;color:var(--ink);text-decoration:none}.cat:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(20,33,43,.1)}
.cat img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block}.cat div{padding:14px 16px 16px}.cat b{font-size:18px}.cat span{display:block;color:var(--mut);font-size:14px;margin-top:4px}
.duo{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.box{background:var(--card);border:1px solid var(--ln);border-radius:18px;padding:24px}.box h2{font-size:24px;margin:0 0 6px}
.box.warn{background:linear-gradient(135deg,var(--deep),#1a4a9c);color:#fff;border:0}.box.warn h2{color:#fff}.box.warn li{margin:6px 0}
.steps{counter-reset:s;list-style:none;padding:0;margin:14px 0 0}.steps li{counter-increment:s;padding-left:44px;position:relative;margin:12px 0}
.steps li:before{content:counter(s);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--acc);color:#1d1404;font-weight:800;display:grid;place-items:center}
.guides{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.g{background:var(--card);border:1px solid var(--ln);border-radius:14px;padding:16px;font-weight:600;color:var(--ink);text-decoration:none}.g:hover{border-color:var(--pri)}.g small{display:block;color:var(--mut);font-weight:500;margin-top:4px}
/* article */
.crumbs{font-size:14px;color:var(--mut);padding:18px 0 0}.crumbs a{color:var(--mut)}
.art-g{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:34px;padding:10px 0 0}
.art h1{font-size:36px;line-height:1.22;margin:8px 0 10px;letter-spacing:-.3px}
.meta{font-size:14px;color:var(--mut);margin:0 0 16px}.lead{font-size:18px;color:#33414b;margin:0 0 18px}
.fig{margin:0 0 22px}.fig img{width:100%;border-radius:18px;display:block;aspect-ratio:16/9;object-fit:cover}
.toc{background:var(--card);border:1px solid var(--ln);border-radius:14px;padding:14px 18px;margin:0 0 22px}.toc b{display:block;margin-bottom:6px}.toc ol{margin:0;padding-left:20px}.toc li{margin:3px 0}.toc a{text-decoration:none}
.prose{background:var(--card);border:1px solid var(--ln);border-radius:18px;padding:26px 30px}
.prose h2{font-size:25px;line-height:1.3;margin:30px 0 10px}.prose h2:first-child{margin-top:0}.prose h3{font-size:19.5px;margin:22px 0 8px}
.prose p{margin:0 0 14px}.prose ul,.prose ol{margin:0 0 16px;padding-left:22px}.prose li{margin:5px 0}
.prose table{width:100%;border-collapse:collapse;margin:8px 0 18px;font-size:15px;display:block;overflow-x:auto}
.prose th,.prose td{border:1px solid var(--ln);padding:9px 11px;text-align:left;vertical-align:top}.prose th{background:#eef3fb}
.cta-box{display:flex;align-items:center;justify-content:space-between;gap:14px;background:linear-gradient(135deg,var(--deep),#1a4a9c);color:#fff;border-radius:16px;padding:16px 20px;margin:20px 0}
.cta-box b{display:block;font-size:17px}.cta-box span{font-size:13.5px;opacity:.85}.cta-box .btn{flex:none}
.faq{margin-top:26px}.faq h2{font-size:25px;margin:0 0 10px}
details{background:var(--card);border:1px solid var(--ln);border-radius:14px;padding:14px 18px;margin:10px 0}summary{font-weight:700;cursor:pointer}details p{margin:10px 0 0}
.side .box{padding:18px;margin-bottom:16px}.side h2{font-size:18px}.side ul{list-style:none;padding:0;margin:8px 0 0}.side li{margin:7px 0}.side a{text-decoration:none;font-weight:600}
.side .warn{font-size:14.5px}.side .warn a{color:#fff;text-decoration:underline}
.rel{margin-top:26px}.rel h2{font-size:22px;margin:0 0 12px}.rel-g{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.ft{background:var(--deep);color:#d9e2ef;margin-top:64px;padding:40px 0 20px;font-size:14.5px}.ft a{color:#fff;text-decoration:none}.ft-g{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:26px}
.ft h3{color:#fff;font-size:16px;margin:0 0 10px}.ft ul{list-style:none;padding:0;margin:0}.ft li{margin:6px 0}.ft .logo{color:#fff}
.age{display:inline-block;background:var(--red);color:#fff;font-weight:800;border-radius:6px;padding:0 7px;margin-right:6px}
.ft-bot{border-top:1px solid rgba(255,255,255,.15);margin-top:26px;padding-top:14px;font-size:13px;opacity:.85}
.sticky{display:none}
.go{max-width:640px;margin:60px auto;text-align:center}.go .box{padding:34px}
@media (max-width:960px){.art-g{grid-template-columns:1fr}.side{order:2}.ft-g{grid-template-columns:1fr 1fr}}
@media (max-width:860px){.nav{display:none;position:absolute;left:0;right:0;top:66px;background:#fff;border-bottom:1px solid var(--ln);padding:8px 18px 14px}.nav.open{display:block}.nav ul{flex-direction:column;gap:0}.nav li a{display:block;padding:10px 0;border-bottom:1px solid #f0ebe0}.nav-btn{display:block}
.hero-g{grid-template-columns:1fr;padding:26px 18px 54px;gap:22px}.hero h1{font-size:28px}.quick-g{grid-template-columns:repeat(4,1fr)}.cats{grid-template-columns:repeat(2,1fr)}.duo{grid-template-columns:1fr}.guides{grid-template-columns:1fr 1fr}.sec h2,.sh h2{font-size:23px}
.art h1{font-size:27px}.prose{padding:18px 16px}.prose h2{font-size:22px}.rel-g{grid-template-columns:1fr 1fr}.cta-box{flex-direction:column;align-items:flex-start}
.sticky{display:flex;position:fixed;left:0;right:0;bottom:0;gap:8px;padding:10px 12px;background:var(--card);border-top:1px solid var(--ln);z-index:30;box-shadow:0 -6px 20px rgba(0,0,0,.08)}.sticky .btn{flex:1;padding:12px 8px}.sticky .btn-ghost{color:var(--pri)}body{padding-bottom:72px}}
@media (max-width:420px){.ft-g{grid-template-columns:1fr}.q{font-size:13px}.cat b{font-size:16px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
.go h1{font-size:30px;line-height:1.25}
@media (max-width:520px){.top{font-size:11.5px;padding:5px 8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.go h1{font-size:24px}}