/* KITA – Kiến tạo tri thức, dẫn lối tương lai */
:root{
  --red:#E8262D; --red-deep:#C0151C; --red-soft:#FFEDEE;
  --blue:#1C3399; --blue-deep:#0F1D5E; --blue-soft:#EEF3FF;
  --yellow:#FFC73A; --yellow-soft:#FFF5D6;
  --ink:#18213F; --muted:#5B6584; --line:#E5EAF5; --bg:#FFFFFF; --sunk:#F5F8FF;
  --ok:#14966B;
  --radius:18px; --shadow:0 14px 34px rgba(28,51,153,.13);
  --f-head:"Nunito","Be Vietnam Pro",system-ui,sans-serif; --f-body:"Be Vietnam Pro",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.65 var(--f-body);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{font-family:var(--f-head);line-height:1.2;margin:0 0 .5em;color:var(--ink)}
h1{font-size:clamp(30px,5vw,52px);font-weight:900;letter-spacing:-.01em}
h2{font-size:clamp(26px,3.6vw,38px);font-weight:900}
h3{font-size:20px;font-weight:800}
p{margin:0 0 1em}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
.section{padding:72px 0}
.section.sunk{background:var(--sunk)}
.section.blue{background:linear-gradient(135deg,var(--blue),var(--blue-deep));color:#fff}
.section.blue h2,.section.blue h3{color:#fff}
.eyebrow{display:inline-block;font:800 13px var(--f-body);letter-spacing:.12em;text-transform:uppercase;color:var(--red);margin-bottom:10px}
.lead{font-size:18px;color:var(--muted);max-width:720px}
.center{text-align:center}.center .lead{margin-left:auto;margin-right:auto}
.hl{color:var(--red)} .hl-blue{color:var(--blue)}
.underline{background:linear-gradient(transparent 62%,var(--yellow) 62%)}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:999px;font:800 16px var(--f-head);border:2px solid transparent;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s;text-decoration:none!important;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}
.btn-red{background:var(--red);color:#fff;box-shadow:0 8px 20px rgba(227,38,46,.3)}
.btn-red:hover{background:var(--red-deep)}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:var(--blue-deep)}
.btn-ghost{background:#fff;color:var(--blue);border-color:var(--blue)}
.btn-yellow{background:var(--yellow);color:#18213F;box-shadow:0 8px 20px rgba(255,199,58,.35)}
.btn-sm{padding:9px 16px;font-size:14px}
.btns{display:flex;gap:12px;flex-wrap:wrap}

/* Top bar + header */
.topbar{background:var(--blue-deep);color:#fff;font-size:13.5px}
.topbar .wrap{display:flex;justify-content:space-between;gap:12px;padding-top:7px;padding-bottom:7px;flex-wrap:wrap}
.topbar a{color:#fff}
.topbar span{opacity:.92}
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;gap:18px;height:76px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none!important}
.brand img{height:58px;width:auto}
.brand b{font:900 22px var(--f-head);color:var(--red);letter-spacing:.02em;line-height:1}
.brand small{display:block;font:600 11.5px var(--f-body);color:var(--blue);letter-spacing:.02em}
nav.main{margin-left:auto;display:flex;align-items:center;gap:4px}
nav.main>a,nav.main .dd>button{white-space:nowrap;font:700 15px var(--f-head);color:var(--ink);padding:10px 12px;border-radius:10px;background:none;border:0;cursor:pointer}
nav.main>a:hover,nav.main .dd>button:hover,nav.main a.on{color:var(--red);text-decoration:none;background:var(--red-soft)}
.dd{position:relative}
.dd-menu{position:absolute;top:100%;left:0;min-width:300px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:8px;display:none}
.dd:hover .dd-menu,.dd:focus-within .dd-menu{display:block}
.dd-menu a{display:block;padding:9px 12px;border-radius:10px;color:var(--ink);font-weight:600}
.dd-menu a small{display:block;color:var(--muted);font-weight:400;font-size:12.5px}
.dd-menu a:hover{background:var(--sunk);text-decoration:none;color:var(--red)}
.nav-cta{margin-left:8px}
nav.main>a.nav-cta{background:var(--red);color:#fff;padding:10px 16px;border-radius:999px;box-shadow:0 6px 16px rgba(232,38,45,.28)}
nav.main>a.nav-cta:hover{background:var(--red-deep);color:#fff}
.burger{display:none;margin-left:auto;background:none;border:0;font-size:28px;cursor:pointer;color:var(--blue)}

/* Hero */
.hero{position:relative;overflow:hidden;background:radial-gradient(700px 420px at 92% 8%,rgba(255,199,58,.28),transparent 62%),radial-gradient(600px 400px at -5% 100%,rgba(232,38,45,.10),transparent 60%),linear-gradient(180deg,#fff 0%,#EEF3FF 100%)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding-top:56px;padding-bottom:64px}
.hero p.lead{font-size:19px}
.hero .chips{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 26px}
.chip{display:inline-flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:14px;font-weight:600;color:var(--blue)}
.hero-media{position:relative}
.hero-media .main{border-radius:28px;overflow:hidden;box-shadow:var(--shadow);aspect-ratio:4/3.4}
.hero-media .main img{width:100%;height:100%;object-fit:cover}
.badge-float{position:absolute;background:#fff;border-radius:16px;box-shadow:var(--shadow);padding:12px 16px;font-weight:700;font-size:14px}
.badge-float b{display:block;font:900 22px var(--f-head);color:var(--red)}
.badge-float.b1{left:-18px;bottom:28px}
.badge-float.b2{right:-10px;top:24px}
.trust{display:flex;gap:22px;flex-wrap:wrap;color:var(--muted);font-size:14px;margin-top:22px}
.trust b{color:var(--ink)}

/* Cards */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 2px 0 rgba(28,51,153,.04);transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.prog{display:flex;flex-direction:column;padding:0;overflow:hidden}
.prog .ph{aspect-ratio:16/10;overflow:hidden;background:var(--sunk)}
.prog .ph img{width:100%;height:100%;object-fit:cover}
.prog .pb{padding:20px 22px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.prog .age{font:800 12.5px var(--f-body);color:var(--blue);text-transform:uppercase;letter-spacing:.08em}
.prog p{color:var(--muted);font-size:15px;margin:0}
.prog .more{margin-top:auto;font:800 15px var(--f-head);color:var(--red)}
.tags{display:flex;gap:6px;flex-wrap:wrap}
.tag{font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;background:var(--blue-soft);color:var(--blue)}
.tag.red{background:var(--red-soft);color:var(--red)}.tag.yellow{background:var(--yellow-soft);color:#8A5A00}
.icon{width:54px;height:54px;border-radius:16px;display:grid;place-items:center;font-size:26px;margin-bottom:12px}
.i-red{background:var(--red-soft)}.i-blue{background:var(--blue-soft)}.i-yellow{background:var(--yellow-soft)}.i-green{background:#E3F6EF}
.feature h3{font-size:18px}
.feature p{color:var(--muted);font-size:15px;margin:0}

/* Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split img{border-radius:24px;box-shadow:var(--shadow)}
.checks{list-style:none;padding:0;margin:0 0 1.2em}
.checks li{position:relative;padding-left:32px;margin-bottom:10px}
.checks li::before{content:"✓";position:absolute;left:0;top:1px;width:22px;height:22px;border-radius:50%;background:var(--red);color:#fff;font-size:13px;font-weight:900;display:grid;place-items:center}

/* Path (Cambridge) */
.path{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;align-items:end}
.step{border-radius:18px;padding:18px;color:#fff;font-family:var(--f-head)}
.step b{display:block;font-size:22px;font-weight:900}
.step span{font-size:14px;opacity:.95}
.s1{background:#2F5BE0;min-height:110px}.s2{background:#E3262E;min-height:140px}.s3{background:#F5A400;min-height:170px}.s4{background:#12A37A;min-height:200px}

/* Mode */
.mode{border-radius:24px;padding:30px;position:relative;overflow:hidden}
.mode.off{background:var(--red-soft)} .mode.on{background:var(--blue-soft)}
.mode h3{font-size:24px}

/* Timeline (buổi học) */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:f}
.flow .card{position:relative;padding-top:34px}
.flow .card::before{counter-increment:f;content:counter(f);position:absolute;top:-16px;left:22px;width:38px;height:38px;border-radius:50%;background:var(--yellow);font:900 18px var(--f-head);display:grid;place-items:center;border:3px solid #fff}

/* Gallery */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:200px;gap:12px}
.gallery figure{margin:0;border-radius:16px;overflow:hidden;position:relative}
.gallery figure.tall{grid-row:span 2}.gallery figure.wide{grid-column:span 2}
.gallery img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.gallery figure:hover img{transform:scale(1.05)}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;padding:24px 12px 10px;background:linear-gradient(transparent,rgba(0,0,0,.6));color:#fff;font-size:13px;font-weight:600}

/* Stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat{text-align:center;padding:10px}
.stat b{display:block;font:900 40px var(--f-head);color:var(--yellow)}
.stat span{opacity:.9;font-size:15px}

/* FAQ */
details.faq{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin-bottom:10px}
details.faq summary{font:800 17px var(--f-head);cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:12px}
details.faq summary::after{content:"+";color:var(--red);font-size:22px;line-height:1}
details.faq[open] summary::after{content:"–"}
details.faq p{margin:12px 0 0;color:var(--muted)}

/* Form */
.form-card{background:#fff;border-radius:24px;box-shadow:var(--shadow);padding:30px;border-top:6px solid var(--red)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-grid .full{grid-column:1/-1}
label.f{display:flex;flex-direction:column;gap:6px;font-weight:700;font-size:14px}
label.f input,label.f select,label.f textarea{font:16px var(--f-body);padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;background:#fff;color:var(--ink)}
label.f input:focus,label.f select:focus,label.f textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-soft)}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:13.5px;color:var(--muted)}
.consent input{margin-top:4px;width:18px;height:18px}
.form-msg{display:none;border-radius:14px;padding:16px;margin-top:14px;font-size:15px}
.form-msg.ok{display:block;background:#E3F6EF;color:#0B6B4C}
.form-msg.err{display:block;background:var(--yellow-soft);color:#6B4A00}

/* Article */
.article{max-width:780px;margin:0 auto}
.article h2{font-size:28px;margin-top:1.4em}
.article img{border-radius:20px;margin:20px 0}
.article .meta{color:var(--muted);font-size:14px}
.post-card .ph{aspect-ratio:1200/630}
.post-card .ph img{object-position:center 30%}

/* Page hero */
.page-hero{background:linear-gradient(135deg,var(--blue),var(--blue-deep));color:#fff;padding:56px 0 48px}
.page-hero h1{color:#fff;font-size:clamp(28px,4.4vw,46px)}
.page-hero p{color:rgba(255,255,255,.9);font-size:18px;max-width:760px}
.crumbs{font-size:13.5px;margin-bottom:12px;opacity:.85}
.crumbs a{color:#fff}
.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:-34px;position:relative}
.fact{background:#fff;border-radius:16px;box-shadow:var(--shadow);padding:16px 18px}
.fact small{display:block;color:var(--muted);font-size:12.5px;font-weight:700;text-transform:uppercase;letter-spacing:.06em}
.fact b{font:800 17px var(--f-head);color:var(--ink)}

/* CTA band */
.cta-band{background:linear-gradient(120deg,var(--red),#F2552C);color:#fff;border-radius:28px;padding:40px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.cta-band h2{color:#fff;margin:0 0 6px}
.cta-band p{margin:0;opacity:.95}

/* Footer */
footer.site{background:#0E1A52;color:#C8D1F0;padding:56px 0 24px;font-size:15px}
footer.site h4{color:#fff;font-size:17px}
footer.site a{color:#fff}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px}
.fbrand img{height:72px;background:#fff;border-radius:14px;padding:6px;margin-bottom:12px}
footer.site ul{list-style:none;padding:0;margin:0}
footer.site li{margin-bottom:8px}
.legal{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:18px;font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* Floating contact */
.float{position:fixed;right:16px;bottom:18px;z-index:60;display:flex;flex-direction:column;gap:10px}
.float a{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;box-shadow:0 8px 20px rgba(0,0,0,.2);color:#fff;font-weight:900;text-decoration:none!important;font-size:13px}
.float .call{background:var(--red);animation:pulse 2s infinite}
.float .zalo{background:#0068FF}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(227,38,46,.5)}70%{box-shadow:0 0 0 14px rgba(227,38,46,0)}100%{box-shadow:0 0 0 0 rgba(227,38,46,0)}}
.mbar{display:none}

.fb-box{background:#fff;border-radius:20px;box-shadow:var(--shadow);padding:10px;display:flex;justify-content:center;min-height:200px}
.map{border:0;width:100%;height:360px;border-radius:20px}

/* Responsive */
@media (max-width:1024px){
  .g4,.flow,.stats{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:repeat(2,1fr)}
  .fgrid{grid-template-columns:1fr 1fr}
  .facts{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:720px){
  nav.main{display:none;position:absolute;top:76px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:12px 16px 18px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);max-height:calc(100vh - 76px);overflow:auto}
  nav.main.open{display:flex}
  .dd-menu{position:static;display:block;box-shadow:none;border:0;padding:0 0 0 12px;min-width:0}
  .nav-cta{margin:8px 0 0}
  .burger{display:block}
}
@media (max-width:860px){
  .hero .wrap,.split{grid-template-columns:1fr}
  .hero-media{order:-1}
  .badge-float.b1{left:8px}.badge-float.b2{right:8px}
  .path{grid-template-columns:repeat(2,1fr)}
  .gallery{grid-template-columns:repeat(2,1fr);grid-auto-rows:160px}
  .form-grid{grid-template-columns:1fr}
  .section{padding:52px 0}
  .topbar .hide-m{display:none}
}
@media (max-width:560px){
  .g2,.g3,.g4,.flow,.stats,.facts,.fgrid{grid-template-columns:1fr}
  .wrap{padding:0 16px}
  .brand img{height:48px}
  .float{display:none}
  .mbar{display:grid;grid-template-columns:1fr 1fr 1.3fr;position:fixed;left:0;right:0;bottom:0;z-index:60;background:#fff;border-top:1px solid var(--line);box-shadow:0 -6px 18px rgba(0,0,0,.08)}
  .mbar a{padding:12px 6px;text-align:center;font:800 14px var(--f-head);color:var(--blue);text-decoration:none!important}
  .mbar a.go{background:var(--red);color:#fff}
  body{padding-bottom:52px}
  .cta-band{padding:28px}
}

/* ===== Lớp trang trí, tăng tính thu hút ===== */
.btn-red{background:linear-gradient(135deg,#FF4A4F,var(--red) 55%,var(--red-deep))}
.hero::before{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:var(--yellow);opacity:.18;right:-140px;top:-160px}
.hero::after{content:"";position:absolute;width:180px;height:180px;border-radius:50%;border:18px solid var(--red);opacity:.08;left:-60px;bottom:-60px}
.hero .wrap{position:relative;z-index:1}
.hero h1 .hl{background:linear-gradient(90deg,var(--red),#FF6A3D);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-media .main{border:6px solid #fff;transform:rotate(1.5deg)}
.hero-media::before{content:"";position:absolute;inset:18px -14px -14px 18px;border-radius:28px;background:var(--yellow);z-index:-1;transform:rotate(-2deg)}
.hero-media{z-index:0}
.badge-float{border-left:5px solid var(--red)}
.badge-float.b2{border-left-color:var(--yellow)}
.eyebrow{background:var(--red-soft);padding:5px 12px;border-radius:999px}
.section.blue .eyebrow,.page-hero .eyebrow{background:rgba(255,255,255,.15);color:var(--yellow)}
.page-hero{position:relative;overflow:hidden;background:radial-gradient(500px 300px at 95% 0%,rgba(255,199,58,.35),transparent 60%),linear-gradient(135deg,#2440B8,var(--blue-deep))}
.page-hero::after{content:"";position:absolute;right:6%;bottom:-70px;width:200px;height:200px;border-radius:50%;border:22px solid rgba(232,38,45,.35)}
.page-hero .wrap{position:relative;z-index:1}
.section.blue{background:radial-gradient(600px 300px at 10% 0%,rgba(255,199,58,.18),transparent 60%),linear-gradient(135deg,#2440B8,var(--blue-deep))}
.prog{border-top:5px solid var(--blue)}
.grid .prog:nth-child(3n+2){border-top-color:var(--red)}
.grid .prog:nth-child(3n){border-top-color:var(--yellow)}
.prog h3{transition:color .15s}.prog:hover h3{color:var(--red)}
.card.feature:hover .icon{transform:scale(1.08) rotate(-4deg)}
.icon{transition:transform .2s}
.cta-band{background:radial-gradient(400px 220px at 100% 0%,rgba(255,199,58,.45),transparent 60%),linear-gradient(120deg,var(--red),#FF5A36)}
.mode.off{background:linear-gradient(160deg,#FFF1F1,#FFE3E3)} .mode.on{background:linear-gradient(160deg,#F1F5FF,#E1E9FF)}
.stat b{text-shadow:0 2px 0 rgba(0,0,0,.15)}
.topbar{background:var(--blue-deep)}
.fact{border-bottom:4px solid var(--yellow)}
.form-card{border-top:6px solid var(--red);position:relative}
.form-card::before{content:"🎁";position:absolute;top:-22px;right:22px;width:46px;height:46px;border-radius:50%;background:var(--yellow);display:grid;place-items:center;font-size:22px;box-shadow:var(--shadow)}
.underline{background:linear-gradient(transparent 60%,rgba(255,199,58,.7) 60%)}
.article table td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.article table td:first-child{white-space:nowrap;color:var(--blue);width:1%}
.article table tr:nth-child(even) td{background:var(--sunk)}
.article .tbl{border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:10px 0 20px}
.article h3{margin-top:1.2em;color:var(--red)}
@media (max-width:560px){.article table td:first-child{white-space:normal}}

/* ===== Bài viết phong cách mới ===== */
.post-head{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:4px 0 16px}
.pill{font:700 12.5px var(--f-body);padding:5px 12px;border-radius:999px;background:var(--sunk);color:var(--muted)}
.pill.red{background:var(--red-soft);color:var(--red)} .pill.blue{background:var(--blue-soft);color:var(--blue)} .pill.yellow{background:var(--yellow-soft);color:#8A5A00}
.article .lede{font-size:19px;line-height:1.6}
.tldr{background:var(--yellow-soft);border-left:6px solid var(--yellow);border-radius:18px;padding:20px 24px;margin:24px 0}
.tldr .t,.tip .t{display:block;font:900 13px var(--f-head);letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px}
.tldr .t{color:#8A5A00} .tldr ul{margin:0;padding-left:20px} .tldr li{margin-bottom:4px}
.myth{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 0}
.myth>div{border-radius:16px;padding:16px 18px;font-size:15.5px}
.myth .no{background:var(--red-soft)} .myth .yes{background:#E3F6EF}
.myth>div>b:first-child{display:block;font:800 12.5px var(--f-head);text-transform:uppercase;letter-spacing:.08em;margin-bottom:6px}
.myth .no>b:first-child{color:var(--red)} .myth .yes>b:first-child{color:#13795B}
.nums{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:22px 0}
.nums div{background:var(--blue-soft);border-radius:16px;padding:18px 14px;text-align:center}
.nums b{display:block;font:900 34px var(--f-head);color:var(--blue);line-height:1.1}
.nums span{font-size:14px;color:var(--muted)}
.tip{background:linear-gradient(135deg,var(--blue),var(--blue-deep));color:#fff;border-radius:20px;padding:22px 26px;margin:28px 0}
.tip .t{color:var(--yellow)} .tip p:last-child,.tip ul:last-child{margin-bottom:0} .tip a{color:var(--yellow);font-weight:700}
.steps-mini{counter-reset:s;list-style:none;padding:0;margin:16px 0}
.steps-mini li{counter-increment:s;position:relative;padding:4px 0 14px 50px;min-height:36px}
.steps-mini li::before{content:counter(s);position:absolute;left:0;top:0;width:36px;height:36px;border-radius:12px;background:var(--red);color:#fff;font:900 16px var(--f-head);display:grid;place-items:center}
.article table.t2{width:100%;border-collapse:collapse;font-size:15px;margin:10px 0 20px}
.article table.t2 th{background:var(--blue);color:#fff;text-align:left;padding:10px 12px;font-family:var(--f-head)}
.article table.t2 td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.article table.t2 tr:nth-child(even) td{background:var(--sunk)}
.post-end{background:var(--red-soft);border-radius:22px;padding:24px;margin-top:32px;text-align:center}
.post-end h3{margin-bottom:6px} .post-end p{color:var(--muted);margin:0 0 14px}
.sources{margin-top:36px;padding-top:18px;border-top:1px dashed var(--line);font-size:13.5px;color:var(--muted)}
.sources h4{font-size:15px;color:var(--ink)} .sources ol{padding-left:20px;margin:0} .sources li{margin-bottom:6px} .sources a{word-break:break-word}
@media(max-width:640px){.myth{grid-template-columns:1fr}.article .lede{font-size:17px}.tip,.tldr{padding:18px}}
.blog-filter{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.blog-filter button{font:700 14px var(--f-body);padding:9px 16px;border-radius:999px;border:1.5px solid var(--line);background:#fff;color:var(--ink);cursor:pointer}
.blog-filter button:hover{border-color:var(--red);color:var(--red)}
.blog-filter button.on{background:var(--red);border-color:var(--red);color:#fff}
.post-card .tag{align-self:flex-start;margin-bottom:6px}
.gallery{grid-auto-flow:dense}
.gallery figure.big{grid-column:span 2;grid-row:span 2}
.gallery video{width:100%;height:100%;object-fit:cover;display:block;background:#000}
.gallery figure.big figcaption{font-size:15px}
.video-badge{position:absolute;top:12px;left:12px;background:var(--red);color:#fff;font:800 12px var(--f-body);padding:5px 10px;border-radius:999px;letter-spacing:.05em}

/* ===== Trang chủ v2 ===== */
.hero2 .wrap{grid-template-columns:1fr 1.05fr;padding-top:48px;padding-bottom:96px}
.hero2 h1{font-size:clamp(34px,4.6vw,58px);line-height:1.08;letter-spacing:-.01em}
.hero2 .trust{margin-top:20px}
.hmosaic{position:relative;display:grid;grid-template-columns:1.6fr 1fr;grid-template-rows:1fr 1fr;gap:12px;aspect-ratio:1.25/1}
.hmosaic>figure{margin:0;border-radius:24px;overflow:hidden;box-shadow:var(--shadow);border:5px solid #fff;position:relative;background:#ddd}
.hmosaic>figure.v{grid-row:span 2}
.hmosaic img,.hmosaic video{width:100%;height:100%;object-fit:cover;display:block}
.hmosaic .live{position:absolute;left:14px;bottom:14px;background:rgba(15,29,94,.82);color:#fff;font:800 12.5px var(--f-body);padding:7px 12px;border-radius:999px;display:flex;align-items:center;gap:7px;backdrop-filter:blur(4px)}
.hmosaic .live i{width:9px;height:9px;border-radius:50%;background:#ff3b3b;box-shadow:0 0 0 0 rgba(255,59,59,.7);animation:pulse 1.6s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 9px rgba(255,59,59,0)}100%{box-shadow:0 0 0 0 rgba(255,59,59,0)}}
.hmosaic .badge-float.b1{left:-22px;bottom:-22px}.hmosaic .badge-float.b2{right:-14px;top:-18px}
.hmosaic::before{content:"";position:absolute;inset:26px -18px -18px 26px;border-radius:30px;background:var(--yellow);opacity:.55;z-index:-1;transform:rotate(-2deg)}

.milestones{position:relative;z-index:2;margin-top:-58px}
.milestones .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.milestones .m{background:#fff;border-radius:20px;box-shadow:var(--shadow);padding:20px 22px;border-bottom:5px solid var(--blue)}
.milestones .m:nth-child(2){border-color:var(--red)}.milestones .m:nth-child(3){border-color:var(--yellow)}.milestones .m:nth-child(4){border-color:#13795B}
.milestones b{display:block;font:900 32px var(--f-head);color:var(--ink);line-height:1.1}
.milestones span{font-size:14px;color:var(--muted)}

.age-tabs{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:22px 0 30px}
.age-tabs button{font:800 15px var(--f-head);padding:11px 20px;border-radius:999px;border:2px solid var(--line);background:#fff;color:var(--ink);cursor:pointer;transition:.15s}
.age-tabs button:hover{border-color:var(--red);color:var(--red)}
.age-tabs button.on{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 8px 18px rgba(28,51,153,.25)}
.pcards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.pcard{position:relative;border-radius:24px;overflow:hidden;background:#fff;box-shadow:0 10px 30px rgba(24,33,63,.10);display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.pcard:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(24,33,63,.16)}
.pcard .pimg{position:relative;aspect-ratio:4/3;overflow:hidden}
.pcard .pimg img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.pcard:hover .pimg img{transform:scale(1.06)}
.pcard .pimg::after{content:"";position:absolute;inset:auto 0 0 0;height:55%;background:linear-gradient(transparent,rgba(15,29,94,.75))}
.pcard .agep{position:absolute;left:16px;top:16px;z-index:1;background:var(--yellow);color:#18213F;font:900 13px var(--f-head);padding:7px 13px;border-radius:999px}
.pcard .ptitle{position:absolute;left:18px;right:18px;bottom:14px;z-index:1;color:#fff;font:900 22px/1.2 var(--f-head);margin:0;text-shadow:0 2px 8px rgba(0,0,0,.3)}
.pcard .pbody{padding:18px 20px 20px;display:flex;flex-direction:column;gap:12px;flex:1}
.pcard .pbody p{margin:0;color:var(--muted);font-size:15px}
.pcard .pact{margin-top:auto;display:flex;gap:10px;align-items:center;justify-content:space-between}
.pcard .pact a.more{font:800 15px var(--f-head);color:var(--blue)}
.pcard .pact a.try{font:800 14px var(--f-head);color:#fff;background:var(--red);padding:9px 14px;border-radius:999px;text-decoration:none}
.pcard.hide{display:none}

.moments{background:linear-gradient(135deg,var(--blue-deep),var(--blue));color:#fff;overflow:hidden}
.moments h2{color:#fff}.moments .lead{color:rgba(255,255,255,.85)}
.moments .split{grid-template-columns:.9fr 1.1fr}
.moments .vbox{position:relative;border-radius:28px;overflow:hidden;border:6px solid rgba(255,255,255,.9);box-shadow:0 24px 60px rgba(0,0,0,.35);aspect-ratio:1/1}
.moments .vbox video{width:100%;height:100%;object-fit:cover;display:block}
.moments .checks li::before{background:var(--yellow);color:#18213F}
.marquee{overflow:hidden;margin-top:44px;mask-image:linear-gradient(90deg,transparent,#000 6%,#000 94%,transparent);-webkit-mask-image:linear-gradient(90deg,transparent,#000 6%,#000 94%,transparent)}
.marquee .track{display:flex;gap:14px;width:max-content;animation:mq 60s linear infinite}
.marquee.rev .track{animation-direction:reverse;animation-duration:70s}
.marquee+.marquee{margin-top:14px}
.marquee img{height:190px;width:auto;border-radius:18px;display:block}
.marquee:hover .track{animation-play-state:paused}
@keyframes mq{to{transform:translateX(-50%)}}
@media (prefers-reduced-motion:reduce){.marquee .track{animation:none}}

.envs{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:18px}
.env{position:relative;border-radius:24px;overflow:hidden;min-height:360px;display:block;color:#fff;text-decoration:none!important}
.env img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.env:hover img{transform:scale(1.05)}
.env::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(15,29,94,.85))}
.env .ec{position:absolute;left:22px;right:22px;bottom:20px;z-index:1}
.env .ec b{display:block;font:900 22px var(--f-head);margin-bottom:4px}
.env .ec span{font-size:14.5px;opacity:.92}

@media (max-width:1024px){.pcards{grid-template-columns:repeat(2,1fr)}.milestones .wrap{grid-template-columns:repeat(2,1fr)}.envs{grid-template-columns:1fr 1fr}.envs .env:first-child{grid-column:span 2}}
@media (max-width:860px){.hero2 .wrap{grid-template-columns:1fr;padding-top:24px;padding-bottom:84px}.hmosaic{order:-1;margin:0 8px 18px}.moments .split{grid-template-columns:1fr}.hmosaic .badge-float.b1{left:6px;bottom:-16px}.hmosaic .badge-float.b2{right:6px}}
@media (max-width:560px){.pcards,.envs{grid-template-columns:1fr}.envs .env:first-child{grid-column:auto}.env{min-height:260px}.milestones b{font-size:26px}.marquee img{height:140px}.age-tabs{flex-wrap:nowrap;overflow-x:auto;justify-content:flex-start;padding-bottom:6px}.age-tabs button{flex:none}}
@media (max-width:560px){.hmosaic .badge-float{display:none}.hmosaic{aspect-ratio:1.15/1}}

/* ===== Header v2: hotline + thanh menu màu ===== */
header.site{position:relative;background:#fff;backdrop-filter:none;border-bottom:0;z-index:51}
header.site .wrap{height:86px}
.hinfo{margin-left:auto;display:flex;align-items:center;gap:16px}
.hotline,.hours{display:flex;align-items:center;gap:10px;text-decoration:none!important;color:var(--ink)}
.hotline{background:var(--red-soft);padding:6px 18px 6px 6px;border-radius:999px;border:1.5px solid rgba(232,38,45,.22);transition:.15s}
.hotline:hover{background:#ffe0e2}
.hinfo .hi{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;font-size:18px;background:var(--red);color:#fff;flex:none}
.hours .hi{background:var(--yellow-soft)}
.hinfo small{display:block;font:600 12px var(--f-body);color:var(--muted);line-height:1.25}
.hinfo b{display:block;font:900 20px var(--f-head);color:var(--red);line-height:1.15;letter-spacing:.01em}
.hours b{color:var(--blue);font-size:17px}
.hotline .hi{animation:ring 2.6s infinite}
@keyframes ring{0%,78%,100%{transform:rotate(0)}82%{transform:rotate(-15deg)}86%{transform:rotate(15deg)}90%{transform:rotate(-10deg)}94%{transform:rotate(8deg)}}
.hcta{padding:12px 20px}
.navbar{position:sticky;top:0;z-index:50;background:linear-gradient(90deg,var(--blue-deep) 0%,var(--blue) 55%,#2A4BD0 100%);box-shadow:0 8px 22px rgba(15,29,94,.22);border-bottom:3px solid var(--yellow)}
.navbar nav.main{margin:0;gap:2px;justify-content:flex-start}
.navbar nav.main>a,.navbar nav.main .dd>button{color:#fff;font-size:15.5px;padding:0 17px;height:54px;display:flex;align-items:center;border-radius:0;position:relative}
.navbar nav.main>a:hover,.navbar nav.main .dd>button:hover,.navbar nav.main .dd:hover>button{background:rgba(255,255,255,.12);color:#fff}
.navbar nav.main>a.on,.navbar nav.main .dd>button.on{background:rgba(255,255,255,.14);color:var(--yellow)}
.navbar nav.main>a.on::after,.navbar nav.main .dd>button.on::after{content:"";position:absolute;left:14px;right:14px;bottom:0;height:4px;border-radius:4px 4px 0 0;background:var(--yellow)}
.navbar nav.main>a.nav-zalo{margin-left:auto;background:var(--yellow);color:#18213F;height:38px;border-radius:999px;padding:0 18px;font-weight:900}
.navbar nav.main>a.nav-zalo:hover{background:#ffd86b;color:#18213F}
.navbar .dd-menu{top:100%;border-top:3px solid var(--yellow);border-radius:0 0 14px 14px}
@media (max-width:1100px){.hours{display:none}.navbar nav.main>a,.navbar nav.main .dd>button{padding:0 12px;font-size:14.5px}}
@media (max-width:860px){.navbar nav.main>a.nav-zalo{display:none}.hinfo b{font-size:18px}}
@media (max-width:720px){
  header.site{position:sticky;top:0;z-index:60;box-shadow:0 2px 10px rgba(15,29,94,.08)}
  header.site .wrap{height:70px;gap:10px}
  .brand img{height:46px}.brand small{display:none}
  .hcta{display:none}
  .hotline{padding:4px;border:0;background:none}.hotline>span:last-child{display:none}
  .burger{margin-left:0}
  .navbar{position:sticky;top:70px;z-index:59;height:0;background:none;box-shadow:none;border:0}
  .navbar nav.main{top:0}
  .navbar nav.main>a,.navbar nav.main .dd>button{color:var(--ink);height:auto;padding:12px 14px;border-radius:10px}
  .navbar nav.main>a.on,.navbar nav.main .dd>button.on{color:var(--red);background:var(--red-soft)}
  .navbar nav.main>a.on::after,.navbar nav.main .dd>button.on::after{display:none}
  .navbar nav.main>a.nav-zalo{display:flex;margin:8px 0 0;justify-content:center;height:44px}
  .navbar .dd-menu{border-top:0}
}
.hmosaic .badge-float.b1{left:auto;right:-16px;bottom:-22px}
/* Logo: slogan căn giữa dưới logo */
.brand{flex-direction:column;align-items:center;gap:1px}
.brand .brow{display:flex;align-items:center;gap:8px}
.brand .brow img{height:50px}
.brand .brow b{font-size:30px;letter-spacing:.04em}
.brand small{text-align:center;font-size:11.5px;white-space:nowrap}
@media (max-width:720px){.brand .brow img{height:40px}.brand .brow b{font-size:24px}.brand small{display:block;font-size:10px}}
/* ===== Header v3: 3 cột cân đối ===== */
header.site .wrap.hgrid{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:104px;gap:16px}
.hside{display:flex;align-items:center}
.hleft{justify-content:flex-start}.hright{justify-content:flex-end;gap:10px}
.brand{flex-direction:row;align-items:center;gap:14px;justify-self:center}
.brand img{height:76px;width:auto}
.brand .btxt{display:flex;flex-direction:column;align-items:center;text-align:center;line-height:1.1}
.brand .btxt em{font:800 13px var(--f-body);font-style:normal;color:var(--blue);text-transform:uppercase;letter-spacing:.06em;white-space:nowrap}
.brand .btxt b{font:900 36px var(--f-head);color:var(--red);letter-spacing:.12em;line-height:1.05;margin:2px 0}
.brand .btxt small{font:600 italic 12.5px var(--f-body);color:var(--muted);white-space:nowrap;display:block}
.hotline .hi{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;font-size:19px;background:var(--red);color:#fff;flex:none}
.hotline small{display:block;font:600 12px var(--f-body);color:var(--muted);line-height:1.25}
.hotline b{display:block;font:900 20px var(--f-head);color:var(--red);line-height:1.15}
.hotline,.hcta{min-height:56px}
.hcta{display:inline-flex;align-items:center;padding:0 24px;border-radius:999px;font-size:16px}
.navbar nav.main{justify-content:center}
.burger{display:none}
@media (max-width:1100px){.brand .btxt em{font-size:11.5px}.brand .btxt b{font-size:30px}.brand img{height:64px}.hotline b{font-size:17px}.hcta{padding:0 16px;font-size:14.5px}}
@media (max-width:900px){.hotline{padding:4px;border:0;background:none}.hotline>span:last-child{display:none}.hcta{display:none}}
@media (max-width:720px){
  header.site .wrap.hgrid{grid-template-columns:auto 1fr auto;height:70px;gap:8px}
  .brand{order:-1;justify-self:start;gap:8px}
  .brand img{height:44px}
  .brand .btxt{align-items:flex-start;text-align:left}
  .brand .btxt em{display:none}
  .brand .btxt b{font-size:24px;letter-spacing:.06em;margin:0}
  .brand .btxt small{font-size:10px}
  .hleft{justify-self:end;grid-column:2}
  .hright{grid-column:3}
  .burger{display:block}
}
/* ===== Lộ trình bậc thang ===== */
.ladder-sec{position:relative;z-index:2;margin-top:-64px}
.ladder-card{background:#fff;border-radius:28px;box-shadow:0 20px 50px rgba(24,33,63,.13);padding:30px 32px 26px}
.lhead{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:22px}
.lhead h2{margin:4px 0 0;font-size:clamp(22px,2.6vw,30px)}
.ladder{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;align-items:end}
.step{display:flex;flex-direction:column;gap:4px;border-radius:18px 18px 6px 6px;padding:16px 16px 14px;color:#fff;text-decoration:none!important;position:relative;transition:transform .15s}
.step:hover{transform:translateY(-4px)}
.step .sage{font:800 12px var(--f-body);opacity:.85;text-transform:uppercase;letter-spacing:.06em}
.step b{font:900 21px var(--f-head);line-height:1.15}
.step .sprog{font-size:14px;font-weight:600;line-height:1.35}
.step .slv{margin-top:auto;align-self:flex-start;background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.35);font:800 12px var(--f-body);padding:4px 10px;border-radius:999px}
.step.s1{min-height:150px;background:linear-gradient(160deg,#FF8A3D,var(--red))}
.step.s2{min-height:180px;background:linear-gradient(160deg,#F04B55,var(--red-deep))}
.step.s3{min-height:210px;background:linear-gradient(160deg,#3A5BD9,var(--blue))}
.step.s4{min-height:240px;background:linear-gradient(160deg,#2240B5,var(--blue-deep))}
.step.s5{min-height:270px;background:linear-gradient(160deg,#FFC73A,#F2A900);color:#18213F}
.step.s5 .slv{background:rgba(24,33,63,.08);border-color:rgba(24,33,63,.2)}
.lscale{display:grid;grid-template-columns:repeat(6,1fr);margin-top:14px;border-radius:14px;overflow:hidden}
.lscale div{padding:9px 6px;text-align:center;background:var(--sunk);border-right:2px solid #fff}
.lscale div:nth-child(1){background:#FFE9DC}.lscale div:nth-child(2){background:#FFE0E2}.lscale div:nth-child(3){background:#FDD5D8}
.lscale div:nth-child(4){background:#E3E9FF}.lscale div:nth-child(5){background:#D3DCFF}.lscale div:nth-child(6){background:#FFF0C7}
.lscale b{display:block;font:900 16px var(--f-head);color:var(--ink)}
.lscale span{font-size:12.5px;color:var(--muted)}
.lnote{font-size:12.5px;color:var(--muted);margin:10px 0 0}
.lfacts{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:20px;padding-top:18px;border-top:1px dashed var(--line)}
.lfacts b{display:block;font:900 26px var(--f-head);color:var(--blue)}
.lfacts span{font-size:14px;color:var(--muted)}
.pcards{grid-template-columns:repeat(4,1fr)}
.pcard .ptitle{font-size:20px}
@media (max-width:1100px){.pcards{grid-template-columns:repeat(3,1fr)}}
@media (max-width:860px){.ladder{grid-template-columns:1fr 1fr}.step{min-height:0!important}.step.s5{grid-column:span 2}.pcards{grid-template-columns:repeat(2,1fr)}.lfacts{grid-template-columns:1fr 1fr}.lscale b{font-size:14px}}
@media (max-width:560px){.ladder-card{padding:22px 18px}.ladder{grid-template-columns:1fr}.step.s5{grid-column:auto}.pcards{grid-template-columns:1fr}.lscale{grid-template-columns:repeat(3,1fr)}.lscale div{border-bottom:2px solid #fff}}
.soon{display:inline-block;vertical-align:middle;background:var(--yellow);color:#18213F;font:800 10.5px var(--f-body);text-transform:uppercase;letter-spacing:.05em;padding:3px 8px;border-radius:999px;margin-left:4px;white-space:nowrap}
.soon.big{font-size:12.5px;padding:6px 14px;margin:0}
.dd-menu a .soon{margin-left:6px}
.soon-ribbon{position:absolute;right:14px;top:16px;z-index:1;background:var(--red);color:#fff;font:900 12px var(--f-head);padding:7px 12px;border-radius:999px;box-shadow:0 6px 14px rgba(232,38,45,.35)}
.step .soon{background:var(--yellow);margin:4px 0 0;display:inline-block}
.soon-ribbon{right:auto;left:16px;top:52px}
.brand img{height:64px;width:auto}@media (max-width:1100px){.brand img{height:54px}}@media (max-width:720px){.brand img{height:38px}}
/* ===== Trang chương trình v2 ===== */
.page-hero.ph2 .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.phmedia{position:relative;height:340px}
.phmedia img{position:absolute;object-fit:cover;border-radius:22px;border:5px solid #fff;box-shadow:0 18px 40px rgba(0,0,0,.3)}
.phmedia .pa{left:0;top:0;width:78%;height:78%;transform:rotate(-2deg)}
.phmedia .pb{right:0;bottom:0;width:52%;height:56%;transform:rotate(3deg)}
.pgal{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:26px}
.pgal img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:18px;transition:transform .3s}
.pgal img:hover{transform:scale(1.03)}
@media (max-width:860px){.page-hero.ph2 .wrap{grid-template-columns:1fr}.phmedia{height:260px;order:-1}.pgal{grid-template-columns:1fr 1fr}}