.kgx-site{
  --primary:#1E40AF; --primary-600:#1D4ED8; --secondary:#3B82F6; --accent:#EA580C; --accent-600:#C2410C;
  --bg:#EFF6FF; --surface:#FFFFFF; --fg:#1E3A8A; --text:#1E293B; --muted:#E9EEF6; --muted-fg:#64748B;
  --border:#BFDBFE; --success:#059669; --metric:#F59E0B;
  --r-sm:4px; --r-md:8px; --r-lg:12px; --r-pill:999px; --elev-2:0 4px 6px rgba(30,58,138,.10); --t:150ms ease;
  font-family:'Be Vietnam Pro',system-ui,sans-serif; color:var(--text); line-height:1.75; font-size:17px; -webkit-font-smoothing:antialiased; background:var(--surface);
}
.kgx-site *{box-sizing:border-box; margin:0; padding:0}
.kgx-site svg{display:block}
.kgx-site a{text-decoration:none; color:inherit}
.kgx-site ul,.kgx-site ol{padding-left:22px; margin:14px 0}.kgx-site li{margin-bottom:8px}
.kgx-wrap{max-width:1200px; margin:0 auto; padding:0 20px}
.kgx-ic{width:24px; height:24px; stroke:currentColor; stroke-width:2; fill:none; stroke-linecap:round; stroke-linejoin:round}
.kgx-site h1,.kgx-site h2,.kgx-site h3{font-family:'Be Vietnam Pro',sans-serif; color:var(--fg); line-height:1.25}
.kgx-btn{display:inline-flex; align-items:center; gap:8px; font-family:'Be Vietnam Pro',sans-serif; font-weight:600; font-size:16px; padding:13px 26px; border-radius:var(--r-md); border:2px solid transparent; cursor:pointer; transition:background var(--t)}
.kgx-btn-accent{background:var(--accent); color:#fff}.kgx-btn-accent:hover{background:var(--accent-600)}
.kgx-top{background:var(--primary); color:#dbe4ff; font-size:14px}
.kgx-top .kgx-wrap{display:flex; justify-content:space-between; padding:8px 20px; flex-wrap:wrap; gap:6px}
.kgx-top a{color:#fff; font-weight:600}
.kgx-hd{position:sticky; top:0; z-index:50; background:#fff; border-bottom:1px solid var(--border)}
.kgx-hd .kgx-wrap{display:flex; align-items:center; justify-content:space-between; padding:14px 20px}
.kgx-logo{display:flex; align-items:center; gap:12px}
.kgx-logo-mark{height:52px; width:auto; display:grid; place-items:center; background:transparent}
.kgx-logo-mark img{height:52px; width:auto; object-fit:contain; display:block}
.kgx-logo b{font-family:'Be Vietnam Pro',sans-serif; font-size:19px; color:var(--fg); display:block; line-height:1.1; font-weight:700}
.kgx-logo small{font-size:11px; color:var(--muted-fg); letter-spacing:1.5px; text-transform:uppercase}
.kgx-nav{display:flex; gap:28px}
.kgx-nav a{font-family:'Be Vietnam Pro',sans-serif; font-weight:500; color:var(--text); font-size:15px}.kgx-nav a:hover{color:var(--primary)}
/* ===== BLOG 3 CỘT ===== */
.kgx-blog-wrap{max-width:1260px; margin:0 auto; padding:40px 20px; display:grid; grid-template-columns:236px minmax(0,1fr) 292px; gap:40px; align-items:start}
.kgx-article-head{grid-column:1 / -1; padding-bottom:8px; border-bottom:1px solid var(--border); margin-bottom:4px}
.kgx-main{min-width:0}
/* Mục lục trái (sticky + scroll-spy) */
.kgx-toc{position:sticky; top:88px; align-self:start}
.kgx-toc-h{font-family:'Be Vietnam Pro',sans-serif; font-size:13px; font-weight:700; text-transform:uppercase; letter-spacing:1px; color:var(--muted-fg); margin-bottom:12px; display:flex; align-items:center; gap:8px}
.kgx-toc-h .kgx-ic{width:16px; height:16px; color:var(--accent)}
.kgx-toc ul{list-style:none; padding:0; margin:0; border-left:2px solid var(--border)}
.kgx-toc a{display:block; padding:7px 14px; margin-left:-2px; border-left:2px solid transparent; color:var(--muted-fg); font-size:14px; line-height:1.45; transition:color var(--t),border-color var(--t)}
.kgx-toc a:hover{color:var(--primary)}
.kgx-toc a.active{color:var(--accent); border-left-color:var(--accent); font-weight:700}
/* Cột phải: bài viết khác */
.kgx-aside-r{position:sticky; top:88px; align-self:start; display:flex; flex-direction:column; gap:22px}
.kgx-aside-h{font-family:'Be Vietnam Pro',sans-serif; font-size:15px; font-weight:700; color:var(--fg); margin-bottom:12px; display:flex; align-items:center; gap:8px}
.kgx-aside-h .kgx-ic{width:18px; height:18px; color:var(--accent)}
.kgx-rel{display:flex; flex-direction:column; gap:12px}
.kgx-rel-item{display:flex; gap:12px; align-items:center; padding:12px; border:1px solid var(--border); border-radius:var(--r-md); transition:border-color var(--t),box-shadow var(--t),transform var(--t)}
.kgx-rel-item:hover{border-color:var(--secondary); box-shadow:var(--elev-2); transform:translateY(-2px)}
.kgx-rel-ic{flex:none; width:46px; height:46px; border-radius:var(--r-sm); background:var(--muted); display:grid; place-items:center; color:var(--secondary)}
.kgx-rel-ic .kgx-ic{width:22px; height:22px}
.kgx-rel-item b{font-family:'Be Vietnam Pro',sans-serif; font-size:14px; color:var(--fg); font-weight:600; line-height:1.3; display:block; margin-bottom:3px}
.kgx-rel-item small{font-size:12px; color:var(--accent); font-weight:600}
.kgx-side-cta{background:var(--primary); border-radius:var(--r-lg); padding:22px; text-align:center; color:#fff}
.kgx-side-cta h4{color:#fff; font-size:16px; margin-bottom:6px}
.kgx-side-cta p{color:#dbe4ff; font-size:13px; margin-bottom:14px}
.kgx-side-cta .kgx-btn{width:100%; justify-content:center; padding:11px 18px; font-size:15px}
.kgx-crumb{font-size:13px; color:var(--muted-fg); margin-bottom:18px}.kgx-crumb a{color:var(--primary)}
.kgx-tag{display:inline-flex; background:#fff7ed; color:var(--accent); font-family:'Be Vietnam Pro',sans-serif; font-size:12px; font-weight:700; padding:4px 12px; border-radius:var(--r-pill); margin-bottom:16px}
.kgx-article h1{font-size:36px; font-weight:800; margin-bottom:14px; line-height:1.2}
.kgx-lead{font-size:19px; color:var(--muted-fg); margin-bottom:22px}
.kgx-ameta{display:flex; align-items:center; gap:8px; font-size:14px; color:var(--muted-fg); margin-bottom:22px; padding-bottom:22px; border-bottom:1px solid var(--border)}
.kgx-ameta .kgx-ic{width:16px; height:16px}
.kgx-geo{background:var(--bg); border:1px solid var(--border); border-left:4px solid var(--accent); border-radius:var(--r-md); padding:20px 22px; margin:0 0 28px}
.kgx-geo h2{font-size:16px; margin-bottom:8px; display:flex; align-items:center; gap:8px; color:var(--fg)}
.kgx-geo h2 .kgx-ic{width:20px; height:20px; color:var(--accent)}
.kgx-geo p{font-size:16px; color:var(--text); margin:0}
.kgx-afig{aspect-ratio:16/9; background:var(--muted); border-radius:var(--r-lg); display:grid; place-items:center; color:var(--secondary); margin-bottom:28px; text-align:center; padding:16px}
.kgx-afig .kgx-ic{width:44px; height:44px; margin:0 auto 8px}
.kgx-article h2{font-size:25px; font-weight:800; margin:36px 0 14px}
.kgx-article h2.kgx-num-h{font-size:23px; display:flex; align-items:center; gap:12px}
.kgx-numn{flex:none; display:inline-grid; place-items:center; width:34px; height:34px; border-radius:var(--r-md); background:var(--accent); color:#fff; font-family:'Be Vietnam Pro',sans-serif; font-weight:800; font-size:16px}
.kgx-article h3{font-size:19px; font-weight:600; margin:22px 0 10px}
.kgx-article p{margin-bottom:16px}.kgx-article strong{color:var(--fg)}
.kgx-stat-row{display:grid; grid-template-columns:repeat(3,1fr); gap:14px; margin:24px 0}
.kgx-stat{background:var(--bg); border:1px solid var(--border); border-radius:var(--r-md); padding:16px; text-align:center}
.kgx-stat b{font-family:'Be Vietnam Pro',sans-serif; font-size:26px; font-weight:800; color:var(--primary); display:block}
.kgx-stat small{font-size:13px; color:var(--muted-fg)}
.kgx-note{background:#fff7ed; border-left:4px solid var(--accent); border-radius:var(--r-sm); padding:16px 18px; margin:22px 0; font-size:16px}
.kgx-cta-box{background:var(--primary); border-radius:var(--r-lg); padding:28px; text-align:center; margin:34px 0; color:#fff}
.kgx-cta-box h3{color:#fff; font-size:21px; margin-bottom:8px}.kgx-cta-box p{color:#dbe4ff; margin-bottom:16px}
.kgx-faqs{margin:30px 0}
.kgx-faqs details{background:#fff; border:1px solid var(--border); border-radius:var(--r-md); margin-bottom:12px}
.kgx-faqs summary{padding:16px 18px; font-family:'Be Vietnam Pro',sans-serif; font-weight:600; color:var(--fg); cursor:pointer; list-style:none; display:flex; justify-content:space-between; gap:12px}
.kgx-faqs summary::-webkit-details-marker{display:none}
.kgx-faqs summary .kgx-ic{flex:none; color:var(--accent); transition:transform var(--t)}
.kgx-faqs details[open] summary .kgx-ic{transform:rotate(45deg)}
.kgx-faqs-b{padding:0 18px 16px; color:var(--muted-fg); font-size:16px}
/* ===== MOBILE BOTTOM CTA BAR ===== */
.kgx-mbar{display:none}
@media(max-width:1024px){
  .kgx-blog-wrap{grid-template-columns:1fr; gap:26px; padding:28px 20px}
  .kgx-toc{position:static; border:1px solid var(--border); border-radius:var(--r-lg); padding:14px 18px; background:var(--bg)}
  .kgx-aside-r{position:static}
  /* Mục lục thu gọn: bấm tiêu đề để mở/đóng */
  .kgx-toc-h{cursor:pointer; margin-bottom:0; justify-content:space-between}
  .kgx-toc-h::after{content:""; width:10px; height:10px; border-right:2px solid var(--muted-fg); border-bottom:2px solid var(--muted-fg); transform:rotate(45deg); transition:transform var(--t); margin-left:auto}
  .kgx-toc.kgx-open .kgx-toc-h::after{transform:rotate(225deg)}
  .kgx-toc nav{display:none; margin-top:12px}
  .kgx-toc.kgx-open nav{display:block}
@media(max-width:768px){
  .kgx-nav{display:none} .kgx-article h1{font-size:28px} .kgx-article h2{font-size:22px} .kgx-stat-row{grid-template-columns:1fr}
  .kgx-site{padding-bottom:76px}
  .kgx-mbar{display:grid; grid-template-columns:1fr 1fr; gap:10px; position:fixed; left:0; right:0; bottom:0; z-index:70;
    padding:10px 12px calc(10px + env(safe-area-inset-bottom,0px)); background:#fff; border-top:1px solid var(--border); box-shadow:0 -4px 16px rgba(30,58,138,.12)}
  .kgx-mbar a{display:flex; align-items:center; justify-content:center; gap:8px; height:52px; border-radius:var(--r-md); font-family:'Be Vietnam Pro',sans-serif; font-weight:700; font-size:16px; color:#fff}
  .kgx-mbar a .kgx-ic{width:20px; height:20px}
  .kgx-mbar-call{background:var(--success)}
  .kgx-mbar-quote{background:var(--accent); color:#fff}
@media(prefers-reduced-motion:reduce){.kgx-site *{transition:none!important}}
@media(max-width:768px){.kgx-hd .kgx-btn{padding:9px 14px; font-size:14px} .kgx-hd .kgx-logo small{display:none} .kgx-hd .kgx-logo-mark,.kgx-hd .kgx-logo-mark img{height:40px}}
.kgx-btn-primary{background:var(--primary); color:#fff}.kgx-btn-primary:hover{background:var(--primary-600)}
.kgx-abody{max-width:768px; margin:0 auto; padding:44px 20px}
/* GEO quick answer box */
.kgx-article h2{font-size:25px; font-weight:800; margin:34px 0 14px}
.kgx-article h3{font-size:20px; font-weight:600; margin:24px 0 10px}
.kgx-tblwrap{overflow-x:auto; margin:20px 0}
table.kgx-tbl{width:100%; border-collapse:collapse; font-size:16px; border:1px solid var(--border); border-radius:var(--r-md); overflow:hidden}
table.kgx-tbl th,table.kgx-tbl td{padding:12px 14px; text-align:left; border-bottom:1px solid var(--border)}
table.kgx-tbl th{background:var(--primary); color:#fff; font-family:'Be Vietnam Pro',sans-serif; font-weight:600}
table.kgx-tbl tr:nth-child(even) td{background:var(--bg)}
.kgx-cta-box h3{color:#fff; font-size:21px; margin-bottom:8px}
.kgx-cta-box p{color:#dbe4ff; margin-bottom:16px}
@media(max-width:768px){.kgx-nav{display:none} .kgx-article h1{font-size:28px} .kgx-abody{padding:30px 20px}}