@font-face{font-family:'Be Vietnam Pro';font-weight:400;font-display:swap;src:url(../fonts/be-vietnam-pro-vietnamese-400-normal.woff2) format('woff2');unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:'Be Vietnam Pro';font-weight:400;font-display:swap;src:url(../fonts/be-vietnam-pro-latin-400-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'Be Vietnam Pro';font-weight:600;font-display:swap;src:url(../fonts/be-vietnam-pro-vietnamese-600-normal.woff2) format('woff2');unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:'Be Vietnam Pro';font-weight:600;font-display:swap;src:url(../fonts/be-vietnam-pro-latin-600-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'Be Vietnam Pro';font-weight:700;font-display:swap;src:url(../fonts/be-vietnam-pro-vietnamese-700-normal.woff2) format('woff2');unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:'Be Vietnam Pro';font-weight:700;font-display:swap;src:url(../fonts/be-vietnam-pro-latin-700-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'Be Vietnam Pro';font-weight:800;font-display:swap;src:url(../fonts/be-vietnam-pro-vietnamese-800-normal.woff2) format('woff2');unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:'Be Vietnam Pro';font-weight:800;font-display:swap;src:url(../fonts/be-vietnam-pro-latin-800-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
:root{--bg:#F6F9FB;--navy:#123B6B;--blue:#1F5FA8;--green:#2B8A3E;--teal:#0E6E6D;--ink:#1E2F42;--muted:#5A6F86;--line:#D5E4F3;--card:#fff;--tint-b:#EAF3FC;--tint-g:#EEF7EC;--tint-t:#E7F5F4;--r:18px;--max:1120px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--ink);font-size:17px;line-height:1.7}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-underline-offset:3px}
a:hover{color:var(--navy)}
:focus-visible{outline:3px solid var(--green);outline-offset:2px;border-radius:6px}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px;top:0;background:var(--navy);color:#fff;padding:8px 14px;z-index:99}
.skip:focus{left:12px;top:12px}
/* header */
.site-header{background:rgba(246,249,251,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.site-header .container{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:66px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--navy);text-decoration:none}
.logo .dot{width:36px;height:36px;border-radius:50%;background:var(--green);display:grid;place-items:center;flex:none}
.logo .dot svg{width:21px;height:21px}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{font-weight:600;font-size:15px;color:var(--navy);text-decoration:none;padding:8px 12px;border-radius:10px}
.nav a:hover,.nav a[aria-current=page]{background:var(--tint-b)}
.nav .cta{background:var(--navy);color:#fff}
.nav .cta:hover{background:var(--blue);color:#fff}
@media(max-width:760px){.nav a:not(.cta):not(.keep){display:none}}
/* hero */
.hero{padding:64px 0 48px;background:linear-gradient(135deg,var(--bg) 0%,var(--tint-b) 100%);border-bottom:1px solid var(--line)}
.hero .container{display:grid;grid-template-columns:1.25fr .9fr;gap:40px;align-items:center}
.kicker{font-weight:700;font-size:14px;letter-spacing:2.5px;color:var(--green);text-transform:uppercase}
.hero h1{font-size:clamp(32px,5vw,50px);line-height:1.15;color:var(--navy);margin:10px 0 0;font-weight:800}
.rules{display:flex;gap:8px;margin:18px 0}
.rules span{height:4px;width:70px;border-radius:2px;background:var(--blue)}
.rules span+span{width:32px;background:var(--green)}
.hero p.lead{font-size:19px;color:#2C4560;margin:0 0 24px;max-width:620px}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:16px;padding:13px 22px;border-radius:12px;text-decoration:none;border:2px solid var(--navy)}
.btn.primary{background:var(--navy);color:#fff}
.btn.primary:hover{background:var(--blue);border-color:var(--blue);color:#fff}
.btn.ghost{color:var(--navy);background:#fff}
.btn.ghost:hover{background:var(--tint-b)}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:26px;box-shadow:0 18px 40px rgba(18,59,107,.08)}
.hero-card h2{font-size:18px;margin:0 0 14px;color:var(--navy)}
.hero-card ul{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.hero-card li{display:flex;gap:12px;align-items:flex-start;font-size:15.5px;line-height:1.5}
.tick{flex:none;width:26px;height:26px;border-radius:50%;background:var(--tint-g);display:grid;place-items:center;margin-top:1px}
.tick svg{width:15px;height:15px}
@media(max-width:860px){.hero .container{grid-template-columns:1fr}}
/* sections */
section.block{padding:60px 0}
section.block.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{text-align:center;margin-bottom:34px}
.sec-head h2{font-size:clamp(26px,3.4vw,34px);color:var(--navy);margin:6px 0 0;line-height:1.25}
.sec-head .sub{display:flex;gap:14px;justify-content:center;align-items:center;color:var(--blue);font-weight:600;margin-top:8px}
.sec-head .sub::before,.sec-head .sub::after{content:"";height:2px;width:48px;background:var(--blue)}
.grid{display:grid;gap:20px}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
@media(max-width:900px){.grid.cols-3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.grid.cols-3{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px}
.svc{border-radius:var(--r);padding:24px;border:1px solid transparent}
.svc:nth-child(3n+1){background:var(--tint-b)}.svc:nth-child(3n+2){background:var(--tint-g)}.svc:nth-child(3n){background:var(--tint-t)}
.svc .ic{width:52px;height:52px;border-radius:50%;background:#fff;display:grid;place-items:center;margin-bottom:14px}
.svc .ic svg{width:26px;height:26px}
.svc h3{font-size:18.5px;line-height:1.35;color:var(--navy);margin:0 0 8px}
.svc p{margin:0;font-size:15.5px;color:#334A63;line-height:1.6}
/* post cards */
.post-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s}
.post-card:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(18,59,107,.1)}
.post-card img{aspect-ratio:1200/630;object-fit:cover;width:100%}
.post-card .pc-body{padding:18px 20px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.post-card .meta{font-size:13.5px;color:var(--muted);font-weight:600}
.post-card h3{font-size:19px;line-height:1.35;margin:0}
.post-card h3 a{color:var(--navy);text-decoration:none}
.post-card h3 a::after{content:"";position:absolute;inset:0}
.post-card{position:relative}
.post-card p{margin:0;font-size:15.5px;color:#3A5068;line-height:1.6}
.tag{display:inline-block;align-self:flex-start;background:var(--tint-g);color:var(--green);font-weight:700;font-size:12.5px;padding:3px 10px;border-radius:999px}
/* about */
.about{display:grid;grid-template-columns:auto 1fr;gap:30px;align-items:center}
.avatar{width:150px;height:150px;border-radius:50%;background:var(--navy);display:grid;place-items:center;color:#fff;font-weight:800;font-size:56px;box-shadow:0 0 0 8px var(--tint-b)}
.about h2{margin:0 0 6px;color:var(--navy);font-size:28px}
.about .role{color:var(--blue);font-weight:600;margin:0 0 12px}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.chip{background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:6px 14px;font-weight:600;font-size:14px;color:var(--navy)}
@media(max-width:640px){.about{grid-template-columns:1fr;text-align:center}.avatar{margin:0 auto}.chips{justify-content:center}}
/* faq */
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:4px 20px;margin-bottom:12px}
.faq summary{cursor:pointer;font-weight:700;color:var(--navy);padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:24px;line-height:1;color:var(--blue)}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:0 0 16px;color:#334A63}
/* contact */
.contact{background:var(--navy);color:#fff;border-radius:24px;padding:40px;display:grid;grid-template-columns:1.3fr 1fr;gap:30px;align-items:center}
.contact h2{margin:0 0 10px;font-size:28px}
.contact p{margin:0;color:#D6E4F5}
.contact .btn.primary{background:#fff;color:var(--navy);border-color:#fff}
.contact .btn.primary:hover{background:var(--tint-g)}
.contact .btn.ghost{background:transparent;color:#fff;border-color:#8FB3DA}
.contact ul{list-style:none;margin:16px 0 0;padding:0;font-size:15px;color:#D6E4F5}
@media(max-width:760px){.contact{grid-template-columns:1fr;padding:28px}}
/* article */
.crumbs{font-size:14px;color:var(--muted);padding:18px 0 0}
.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:#9AB0C6}
.crumbs a{color:var(--muted)}
.article-wrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;padding:10px 0 60px}
@media(max-width:980px){.article-wrap{grid-template-columns:1fr}.toc-col{order:-1}}
article.post h1{font-size:clamp(28px,4.2vw,42px);line-height:1.2;color:var(--navy);margin:14px 0 12px;font-weight:800}
.post-meta{display:flex;flex-wrap:wrap;gap:8px 16px;font-size:14.5px;color:var(--muted);align-items:center}
.post-meta .checked{background:var(--tint-g);color:var(--green);font-weight:700;padding:3px 10px;border-radius:999px}
.post .cover{border-radius:var(--r);margin:22px 0 10px;border:1px solid var(--line)}
.post h2{font-size:26px;line-height:1.3;color:var(--navy);margin:38px 0 12px;scroll-margin-top:90px}
.post h3{font-size:20px;color:var(--navy);margin:26px 0 8px}
.post p,.post li{color:#24384E}
.post ul,.post ol{padding-left:24px}
.post li{margin-bottom:8px}
.keybox{background:var(--tint-b);border-left:5px solid var(--navy);border-radius:12px;padding:16px 20px;margin:20px 0}
.note{background:#FFF8E6;border-left:5px solid #D9A21B;border-radius:12px;padding:14px 18px}
.post figure{margin:26px 0}
.post figure img{border-radius:var(--r);border:1px solid var(--line)}
.post figcaption{font-size:14px;color:var(--muted);text-align:center;margin-top:8px}
.table-wrap{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:14px;background:#fff}
table{border-collapse:collapse;width:100%;font-size:15.5px;line-height:1.5}
caption{caption-side:top;text-align:left;font-weight:700;color:var(--navy);padding:12px 16px 4px}
th,td{padding:11px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:var(--tint-b);color:var(--navy);font-weight:700}
tr:last-child td{border-bottom:0}
.sources{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px 24px;margin-top:34px}
.sources h2{margin-top:0;font-size:20px}
.sources li{font-size:15px}
.disclaimer{font-size:14px;color:var(--muted);margin-top:18px}
.author-box{display:flex;gap:18px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px;margin-top:30px}
.author-box .avatar{width:72px;height:72px;font-size:28px;box-shadow:0 0 0 5px var(--tint-b);flex:none}
.author-box p{margin:4px 0 0;font-size:15px;color:#3A5068}
.toc{position:sticky;top:90px;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.toc h2{font-size:15px;letter-spacing:1.5px;text-transform:uppercase;color:var(--green);margin:0 0 10px}
.toc ol{margin:0;padding-left:18px;font-size:15px;line-height:1.5}
.toc li{margin-bottom:8px}
.toc a{color:var(--navy);text-decoration:none}
.toc a:hover{text-decoration:underline}
.side-cta{margin-top:16px;background:var(--tint-g);border-radius:var(--r);padding:18px 20px;font-size:15px}
.side-cta strong{color:var(--navy)}
.related{margin-top:40px}
/* footer */
.site-footer{background:#0E2F55;color:#C9D9EC;padding:44px 0 26px;font-size:15px}
.site-footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
.site-footer h2{color:#fff;font-size:16px;margin:0 0 10px}
.site-footer a{color:#E5EEF8}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.site-footer .bottom{border-top:1px solid #29507D;margin-top:30px;padding-top:18px;font-size:13.5px;color:#9FB7D3}
@media(max-width:760px){.site-footer .cols{grid-template-columns:1fr}}
.blog-head{padding:46px 0 10px;text-align:center}
.blog-head h1{color:var(--navy);font-size:clamp(28px,4vw,40px);margin:6px 0}
/* portrait + video */
.hero-visual{display:grid;gap:16px;justify-items:center}
.portrait{margin:0;position:relative;width:100%;max-width:400px}
.portrait img{width:100%;border-radius:28px;box-shadow:0 22px 50px rgba(18,59,107,.18);border:6px solid #fff;aspect-ratio:780/849;object-fit:cover}
.portrait figcaption{font-size:12px;color:var(--muted);text-align:center;margin-top:8px}
.hero-visual .hero-card{margin-top:-70px;position:relative;width:92%;max-width:380px;padding:20px 22px}
.hero-visual .hero-card h2{font-size:16.5px}
img.avatar{border-radius:50%;object-fit:cover;box-shadow:0 0 0 8px var(--tint-b);display:block}
.author-box img.avatar{box-shadow:0 0 0 5px var(--tint-b);flex:none}
.vgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
@media(max-width:900px){.vgrid{grid-template-columns:repeat(2,1fr)}}
.vthumb{position:relative;display:block;border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#000;aspect-ratio:9/16;text-decoration:none}
.vthumb img{width:100%;height:100%;object-fit:cover;transition:transform .2s}
.vthumb:hover img{transform:scale(1.03)}
.vthumb .play{position:absolute;left:50%;top:44%;width:64px;height:64px;margin:-32px 0 0 -32px;border-radius:50%;background:rgba(18,59,107,.85);box-shadow:0 0 0 6px rgba(255,255,255,.5)}
.vthumb .play::after{content:"";position:absolute;left:26px;top:20px;border-left:18px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent}
.vthumb .vt{position:absolute;left:0;right:0;bottom:0;padding:40px 14px 14px;color:#fff;font-weight:700;font-size:15px;line-height:1.35;background:linear-gradient(transparent,rgba(9,30,55,.92))}
.video-list{display:grid;gap:26px;padding:30px 0 60px}
.video-card{display:grid;grid-template-columns:300px 1fr;gap:28px;background:#fff;border:1px solid var(--line);border-radius:22px;padding:20px;scroll-margin-top:90px}
@media(max-width:720px){.video-card{grid-template-columns:1fr}.video-card .vwrap{max-width:340px;margin:0 auto;width:100%}}
.vwrap{position:relative}
.vwrap video{width:100%;height:auto;aspect-ratio:9/16;border-radius:16px;background:#000;display:block}
.vwrap .dur{position:absolute;right:10px;top:10px;background:rgba(9,30,55,.8);color:#fff;font-size:12.5px;font-weight:700;padding:2px 8px;border-radius:6px}
.vc-body{display:flex;flex-direction:column;gap:10px}
.vc-body h2,.vc-body h3{margin:0;font-size:22px;line-height:1.35;color:var(--navy)}
.vc-body p{margin:0;color:#334A63}
.refs{background:var(--tint-b);border-radius:12px;padding:10px 16px}
.refs summary{cursor:pointer;font-weight:700;color:var(--navy)}
.refs ul{margin:8px 0 2px;padding-left:20px;font-size:15px}
.ai-note{font-size:13px;color:var(--muted)!important}
.portrait figcaption{position:absolute;left:16px;top:16px;margin:0;background:rgba(255,255,255,.88);color:#3A5068;padding:3px 10px;border-radius:8px;font-size:11.5px}
.vthumb .play{left:14px;top:14px;margin:0;width:46px;height:46px;box-shadow:0 0 0 4px rgba(255,255,255,.55)}
.vthumb .play::after{left:18px;top:14px;border-left:14px solid #fff;border-top:9px solid transparent;border-bottom:9px solid transparent}
.logo{white-space:nowrap}
@media(max-width:480px){.nav a{padding:7px 9px;font-size:14px}.logo{font-size:18px}.nav a.keep[href*="video"]{display:none}}
/* brand + AI agent */
.logo .lt{display:flex;flex-direction:column;line-height:1.15}
.logo .ln{font-size:18px;font-weight:800}
.logo .ls{font-size:12px;font-weight:600;color:var(--green);letter-spacing:.3px}
@media(max-width:480px){.logo .ln{font-size:16px}.logo .ls{font-size:11px}}
.ag-steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:none}
@media(max-width:980px){.ag-steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.ag-steps{grid-template-columns:1fr}}
.ag-step{border-radius:20px;padding:22px;position:relative;display:flex;flex-direction:column;gap:12px}
.ag-step:not(:last-child)::after{content:"";position:absolute;right:-14px;top:42px;border-left:10px solid #9AB0C6;border-top:7px solid transparent;border-bottom:7px solid transparent}
@media(max-width:980px){.ag-step::after{display:none}}
.ag-num{width:46px;height:46px;border-radius:50%;color:#fff;font-weight:800;font-size:22px;display:grid;place-items:center}
.ag-step h3{margin:0;font-size:18px;line-height:1.35}
.ag-step p{margin:6px 0 0;font-size:15px;line-height:1.6;color:#2E465F}
.ag-bens{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:22px}
@media(max-width:860px){.ag-bens{grid-template-columns:1fr}}
.ag-ben{display:flex;gap:12px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px 18px}
.ag-ben strong{color:var(--navy)}
.ag-ben p{margin:4px 0 0;font-size:15px;color:#3A5068;line-height:1.55}
.ag-note{margin:18px auto 0;max-width:860px;text-align:center;font-size:14px;color:var(--muted);background:#fff;border:1px dashed var(--line);border-radius:12px;padding:10px 16px}
@media(max-width:480px){.nav a.keep{display:none}}