:root{
  --ink:#233B3A;
  --ink-soft:#5E716F;
  --primary:#2E7D6F;
  --primary-dark:#24665A;
  --primary-soft:#E4F2EE;
  --sun:#F5B841;
  --sun-soft:#FFF4D9;
  --peach:#E8956B;
  --peach-soft:#FDEBE1;
  --lilac:#8E7CC3;
  --lilac-soft:#EEEAF8;
  --sky:#5A9BC9;
  --sky-soft:#E6F1FA;
  --bg:#FFFFFF;
  --bg-alt:#F7FAF8;
  --line:#E2EAE7;
  --line-strong:#CCD9D5;
  --head:'Nunito','Be Vietnam Pro',system-ui,sans-serif;
  --sans:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --shadow:0 2px 4px rgba(35,59,58,.04), 0 14px 36px rgba(35,59,58,.08);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px;}
h1,h2,h3{font-family:var(--head);color:var(--ink);margin:0;line-height:1.25;font-weight:800;}
a{color:inherit;}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--sun);outline-offset:2px;border-radius:8px;}

/* Nav */
.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px;}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--head);font-size:1.45rem;font-weight:900;color:var(--ink);text-decoration:none;}
.brand svg{width:40px;height:40px;}
.nav-links{display:flex;align-items:center;gap:26px;}
.nav-links a{font-size:.95rem;font-weight:500;color:var(--ink-soft);text-decoration:none;}
.nav-links a:hover{color:var(--primary-dark);}

/* Buttons */
.btn{display:inline-block;font-family:var(--head);font-size:1.05rem;font-weight:800;border-radius:999px;padding:14px 30px;text-decoration:none;cursor:pointer;border:2px solid transparent;transition:background .15s ease, border-color .15s ease, transform .1s ease;}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--primary);color:#fff !important;}
.btn-primary:hover{background:var(--primary-dark);}
.btn-outline{background:#fff;border-color:var(--line-strong);color:var(--ink);}
@media (hover:hover){.btn-outline:hover{border-color:var(--primary);color:var(--primary-dark);}}
.btn-sm{padding:9px 20px;font-size:.95rem;}

/* Banner khi đến từ link chia sẻ */
.invite{background:var(--sun-soft);border-bottom:1px solid #F3DFA8;}
.invite[hidden]{display:none;}
.invite-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:14px;padding-bottom:14px;flex-wrap:wrap;}
.invite p{margin:0;font-size:.98rem;color:var(--ink);}
.invite strong{font-family:var(--head);font-weight:800;color:var(--primary-dark);}
.invite .btn{padding:9px 20px;font-size:.95rem;}
.section{padding:88px 0;}
.section.alt{background:var(--bg-alt);}
.section-head{max-width:640px;margin:0 0 46px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.kicker{font-family:var(--head);font-weight:800;font-size:.95rem;color:var(--primary);margin:0 0 8px;}
/* FAQ */
.faq{max-width:800px;margin:0 auto;}
.faq details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:0 24px;margin-bottom:12px;}
.faq summary{list-style:none;cursor:pointer;font-family:var(--head);font-weight:800;font-size:1.06rem;padding:20px 32px 20px 0;position:relative;}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);width:28px;height:28px;border-radius:50%;background:var(--primary-soft);color:var(--primary-dark);display:flex;align-items:center;justify-content:center;font-size:1.2rem;}
.faq details[open] summary::after{content:"–";}
.faq details p{margin:0 0 20px;color:var(--ink-soft);}

/* CTA */
.cta{padding:0 0 88px;}
.cta-box{background:var(--primary);border-radius:36px;padding:60px 40px;text-align:center;position:relative;overflow:hidden;}
.cta-box::before{content:"";position:absolute;width:240px;height:240px;border-radius:50%;background:rgba(255,255,255,.07);right:-60px;top:-80px;}
.cta-box::after{content:"";position:absolute;width:120px;height:120px;border-radius:50%;background:rgba(245,184,65,.35);left:40px;bottom:-50px;}
.cta-box h2{color:#fff;font-size:2.1rem;margin-bottom:12px;position:relative;}
.cta-box p{color:#D7ECE6;max-width:46ch;margin:0 auto 28px;position:relative;}
.cta-box .btn{background:#fff;color:var(--primary-dark) !important;position:relative;}
.cta-box .btn:hover{background:var(--sun-soft);}

/* Footer */
footer{background:var(--bg-alt);border-top:1px solid var(--line);padding:40px 0 46px;}
.foot-top{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-bottom:20px;}
.foot-links{display:flex;gap:22px;flex-wrap:wrap;}
.foot-links a{font-size:.92rem;color:var(--ink-soft);text-decoration:none;}
.foot-links a:hover{color:var(--primary-dark);}
.disclaimer{font-size:.84rem;color:var(--ink-soft);max-width:90ch;margin:0 0 10px;}
.disclaimer a{color:inherit;}
.center{text-align:center;}

/* Trang chân dung */
.p-hero{background:var(--soft,var(--bg-alt));padding:48px 0 56px;position:relative;overflow:hidden;}
.p-hero::after{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:rgba(255,255,255,.55);right:-120px;top:-140px;}
.p-hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;}
.crumbs{font-size:.86rem;color:var(--ink-soft);margin-bottom:18px;}
.crumbs a{color:var(--ink-soft);}
.p-hero .kicker{color:var(--dark,var(--primary));}
.p-hero h1{font-size:2.9rem;font-weight:900;margin-bottom:14px;}
.lead{font-size:1.15rem;color:var(--ink);max-width:52ch;margin:0 0 18px;}
.badge-strength{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 16px;font-size:.92rem;font-weight:600;color:var(--dark,var(--primary-dark));margin:0 0 26px;}
.hero-cta{display:flex;flex-wrap:wrap;align-items:center;gap:12px 18px;}
.hero-cta span{font-size:.9rem;color:var(--ink-soft);}
.p-hero-art{background:#fff;border-radius:50%;aspect-ratio:1;max-width:320px;width:100%;justify-self:center;box-shadow:var(--shadow);display:flex;align-items:center;justify-content:center;}
.p-hero-art svg{width:82%;height:auto;}
.index-hero{background:var(--bg-alt);text-align:center;}
.index-hero .lead{margin:0 auto 26px;}
.index-hero .hero-cta{justify-content:center;}

.article{max-width:780px;padding-top:56px;padding-bottom:72px;}
.article h2{font-size:1.6rem;margin:44px 0 12px;}
.article h2:first-child{margin-top:0;}
.article p{margin:0 0 14px;}
.two{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:30px 0 8px;}
.box{border-radius:22px;padding:24px;}
.box h3{font-size:1.1rem;margin-bottom:6px;}
.box p{margin:0;}
.box.strength{background:var(--soft);}
.box.need{background:var(--bg-alt);border:1px solid var(--line);}
.ages{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:16px;}
.age{border:1px solid var(--line);border-radius:20px;padding:20px;background:#fff;}
.age h3{font-size:1rem;color:var(--dark,var(--primary-dark));margin-bottom:6px;}
.age p{margin:0;font-size:.95rem;}
blockquote{margin:6px 0 16px;padding:20px 24px;border-left:5px solid var(--main);background:var(--soft);border-radius:0 18px 18px 0;font-family:var(--head);font-size:1.2rem;font-weight:800;}
.article .faq{margin:0;}
.article .cta-box{margin:52px 0 22px;padding:44px 28px;}
.article .cta-box h2{margin:0 0 12px;}
.note{font-size:.9rem;color:var(--ink-soft);}

.pgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:16px;margin-top:28px;}
.pgrid.two-col{grid-template-columns:repeat(2,minmax(0,280px));margin:14px 0 40px;}
.fhead{font-size:1.4rem;}
.pcard{display:flex;flex-direction:column;align-items:center;text-align:center;background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px 14px 20px;text-decoration:none;transition:border-color .15s ease, transform .15s ease;}
@media (hover:hover){.pcard:hover{border-color:var(--main);transform:translateY(-2px);}}
.pcard-art{width:110px;height:110px;border-radius:50%;background:var(--soft);display:flex;align-items:center;justify-content:center;margin-bottom:12px;}
.pcard-art svg{width:92px;height:92px;}
.pcard-name{font-family:var(--head);font-weight:800;font-size:1.02rem;color:var(--ink);}
.pcard-tag{font-size:.86rem;color:var(--ink-soft);}

@media (max-width:860px){
  .p-hero-inner{grid-template-columns:1fr;gap:28px;}
  .p-hero-art{max-width:220px;grid-row:1;}
  .p-hero h1{font-size:2.2rem;}
  .two,.ages{grid-template-columns:1fr;}
  .nav-links a.hide-sm{display:none;}
  .section{padding:56px 0;}
}
@media (max-width:480px){
  .pgrid,.pgrid.two-col{grid-template-columns:1fr 1fr;}
  .pcard-art{width:86px;height:86px;}.pcard-art svg{width:72px;height:72px;}
  .brand{font-size:1.25rem;}.nav-links{gap:14px;}
  .p-hero h1{font-size:1.9rem;}
}
.cta-sample{margin:16px 0 0 !important;position:relative;}
.cta-sample a{color:#fff;font-weight:600;}