:root{
  --ink:#16181D;--ink2:#3A3F49;--muted:#6B7280;--faint:#9AA1AD;
  --line:#E8EAED;--canvas:#F6F7F9;--card:#fff;
  --primary:#2947E0;--primary-d:#1E37B8;--primary-soft:#EDF0FE;
  --green:#0F9D63;--green-bg:#E9F7F0;--amber:#B7791F;--amber-bg:#FDF6E7;--red:#D64545;
  --f:"Be Vietnam Pro",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
  --sh:0 18px 50px rgba(20,25,45,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--f);color:var(--ink);background:var(--canvas);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0}
.container{width:min(1140px,calc(100% - 40px));margin:0 auto}
.narrow{width:min(760px,calc(100% - 40px))}
.center{text-align:center}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;font-size:15px;padding:13px 22px;border-radius:10px;border:1.5px solid transparent;cursor:pointer;transition:background .15s,border-color .15s,transform .15s;white-space:nowrap}
.btn:hover{transform:translateY(-1px)}
.btn.primary{background:var(--primary);color:#fff}
.btn.primary:hover{background:var(--primary-d)}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn.ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn.small{padding:9px 16px;font-size:14px}
.btn.full{width:100%}
.btn.white{background:#fff;color:var(--primary)}
.btn.outline-white{border-color:rgba(255,255,255,.5);color:#fff}
.btn.outline-white:hover{background:rgba(255,255,255,.1)}

/* nav */
.nav{position:sticky;top:0;z-index:20;background:rgba(246,247,249,.88);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.navin{display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:19px;letter-spacing:-.02em}
.brand b{color:var(--primary)}
.nav nav{display:flex;gap:26px;margin-left:auto;font-size:14.5px;font-weight:600;color:var(--ink2)}
.nav nav a:hover{color:var(--primary)}
.menubtn{display:none;background:none;border:0;width:40px;height:40px;padding:10px;cursor:pointer}
.menubtn span{display:block;height:2px;background:var(--ink);margin:6px 0;border-radius:2px}

/* hero */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding:72px 0 88px}
.pill{display:inline-block;background:var(--primary-soft);color:var(--primary);font-weight:700;font-size:13px;padding:6px 12px;border-radius:999px}
.hero h1{font-size:clamp(36px,4.6vw,56px);font-weight:800;margin:20px 0 18px;letter-spacing:-.035em}
.hero h1 em{font-style:normal;color:var(--primary)}
.lead{font-size:18px;color:var(--ink2);margin:0;max-width:560px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.actions.center{justify-content:center}
.checks{display:flex;flex-wrap:wrap;gap:8px 20px;list-style:none;padding:0;margin:24px 0 0;color:var(--muted);font-size:14px;font-weight:500}
.checks li:before{content:"✓";color:var(--green);font-weight:800;margin-right:7px}

/* quote mock */
.quote{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--sh);padding:22px;font-size:14px}
.qtop{display:flex;align-items:center;gap:12px;padding-bottom:14px;border-bottom:2px solid var(--primary)}
.qlogo{width:46px;height:46px;border-radius:9px;background:var(--ink);color:#fff;font-size:10px;font-weight:800;display:grid;place-items:center;letter-spacing:.08em;flex:none}
.qmeta{flex:1;min-width:0}
.qmeta b{display:block;font-size:13px;letter-spacing:.02em}
.qmeta small{color:var(--muted);font-size:12px}
.tag{font-size:11px;font-weight:700;color:var(--amber);background:var(--amber-bg);border-radius:999px;padding:4px 9px;white-space:nowrap}
.qcust{color:var(--muted);font-size:13px;margin:12px 0 4px}
.qcust b{color:var(--ink)}
.qroom{font-size:11px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--primary);margin:14px 0 8px}
.qrow{display:flex;align-items:center;gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}
.qrow div{flex:1;min-width:0}
.qrow b{display:block;font-size:14px;font-weight:600}
.qrow small{color:var(--muted);font-size:12px}
.qrow em{font-style:normal;font-weight:700;font-variant-numeric:tabular-nums}
.qimg{width:44px;height:44px;border-radius:9px;background:#F1F3F7;flex:none;position:relative;overflow:hidden}
.qimg.cam:before{content:"";position:absolute;left:11px;top:9px;width:22px;height:22px;border-radius:50%;background:#fff;border:5px solid #2B2F38}
.qimg.cam:after{content:"";position:absolute;left:15px;bottom:5px;width:14px;height:4px;border-radius:2px;background:#C9CED8}
.qimg.sw:before{content:"";position:absolute;inset:8px;border-radius:5px;background:#fff;border:1px solid #D5D9E0;box-shadow:inset 0 0 0 4px #fff,inset 0 0 0 5px #E6E9EF}
.qimg.sw:after{content:"";position:absolute;left:15px;top:20px;width:14px;height:3px;border-radius:2px;background:var(--primary);box-shadow:0 -7px 0 #9DB0FF,0 7px 0 #9DB0FF}
.qimg.cam2:before{content:"";position:absolute;left:7px;top:14px;width:28px;height:14px;border-radius:7px 3px 3px 7px;background:#fff;border:1px solid #CBD0D9}
.qimg.cam2:after{content:"";position:absolute;left:10px;top:18px;width:6px;height:6px;border-radius:50%;background:#2B2F38}
.qhint{margin-top:12px;font-size:13px;color:var(--green);background:var(--green-bg);border-radius:8px;padding:8px 11px;font-weight:600}
.qsum{margin-top:14px;display:grid;gap:4px;font-size:13.5px;color:var(--ink2);font-variant-numeric:tabular-nums}
.qsum div{display:flex;justify-content:space-between}
.qtotal{border-top:1px solid var(--line);padding-top:10px;margin-top:6px;align-items:baseline;color:var(--ink)}
.qtotal b{font-size:24px;font-weight:800;color:var(--primary)}
.qbtns{display:flex;gap:8px;margin-top:16px}
.qbtns span{flex:1;text-align:center;font-size:13px;font-weight:700;border:1px solid var(--line);border-radius:8px;padding:8px}
.qbtns .zalo{background:var(--primary);border-color:var(--primary);color:#fff}

/* pain */
.pain{background:#fff;border-block:1px solid var(--line);padding:72px 0}
.pain h2{font-size:clamp(26px,3vw,36px);font-weight:800}
.vs{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:36px}
.vs>div{border-radius:14px;padding:26px 28px}
.vs h3{font-size:18px;margin-bottom:12px}
.vs ul{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.vs li{padding-left:28px;position:relative}
.before{background:#FBF7F7;border:1px solid #F3E3E3}
.before li:before{content:"✕";position:absolute;left:0;color:var(--red);font-weight:800}
.after{background:var(--primary-soft);border:1px solid #D9DFFC}
.after li:before{content:"✓";position:absolute;left:0;color:var(--primary);font-weight:800}

/* sections */
.section{padding:88px 0}
.head{max-width:680px;margin-bottom:40px}
.eyebrow{font-size:13px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--primary)}
.head h2{font-size:clamp(28px,3.4vw,40px);font-weight:800;margin-top:10px}
.head p{color:var(--muted);margin:12px 0 0;font-size:17px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px}
.feat .ico{display:grid;place-items:center;width:44px;height:44px;border-radius:11px;background:var(--primary-soft);color:var(--primary);font-size:20px;font-weight:800}
.feat h3{font-size:18px;margin:18px 0 8px}
.feat p{margin:0;color:var(--muted);font-size:15px}

.steps-wrap{background:#fff;border-block:1px solid var(--line)}
.steps{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:28px;counter-reset:s}
.steps li{position:relative}
.steps b{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--primary);color:#fff;font-size:17px}
.steps h3{font-size:19px;margin:16px 0 8px}
.steps p{margin:0;color:var(--muted)}

/* pricing */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:stretch}
.plan{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px;display:flex;flex-direction:column}
.plan h3{font-size:20px}
.plan .for{color:var(--muted);font-size:14px;margin:4px 0 0}
.amount{font-size:34px;font-weight:800;letter-spacing:-.03em;margin-top:20px;font-variant-numeric:tabular-nums}
.amount small{font-size:15px;font-weight:600;color:var(--muted);letter-spacing:0}
.year{margin:2px 0 0;font-size:14px;color:var(--muted)}
.plan ul{list-style:none;padding:0;margin:22px 0 26px;display:grid;gap:9px;font-size:15px;flex:1}
.plan li{padding-left:26px;position:relative}
.plan li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:800}
.plan.hot{border:2px solid var(--primary);box-shadow:var(--sh)}
.ribbon{position:absolute;top:-13px;left:28px;background:var(--primary);color:#fff;font-size:12px;font-weight:700;padding:4px 12px;border-radius:999px}
.free{margin:26px 0 0;color:var(--muted);font-size:15px;text-align:center}
.free b{color:var(--ink)}

/* faq */
.faq-wrap{background:#fff;border-top:1px solid var(--line)}
details{border-bottom:1px solid var(--line);padding:4px 0}
summary{cursor:pointer;list-style:none;font-weight:700;font-size:17px;padding:16px 36px 16px 0;position:relative}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";position:absolute;right:4px;top:12px;font-size:24px;font-weight:500;color:var(--primary);transition:transform .2s}
details[open] summary:after{transform:rotate(45deg)}
details p{margin:0 0 18px;color:var(--ink2)}
details a{color:var(--primary);font-weight:600}

/* cta */
.cta{background:var(--primary);color:#fff;padding:80px 0;text-align:center}
.cta h2{font-size:clamp(28px,3.6vw,42px);font-weight:800}
.cta p{color:#D9DFFC;font-size:17px;margin:12px 0 0}

footer{background:#fff;border-top:1px solid var(--line);padding:30px 0 20px;font-size:14px;color:var(--muted)}
.foot{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.foot .brand{font-size:17px;color:var(--ink)}
.foot>a:last-child{color:var(--primary);font-weight:600}
.copy{margin-top:14px;font-size:13px;color:var(--faint)}

@media (max-width:960px){
  .hero{grid-template-columns:1fr;padding:48px 0 64px;gap:40px}
  .grid3,.plans{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr;gap:26px}
  .plan.hot{order:-1;grid-column:1/-1}
}
@media (max-width:760px){
  .navin{gap:10px}
  .nav .btn.small{margin-left:auto}
  .menubtn{display:block}
  .nav nav{display:none;position:absolute;left:0;right:0;top:68px;flex-direction:column;gap:0;background:#fff;border-bottom:1px solid var(--line);padding:6px 20px 14px}
  .nav nav a{padding:12px 0;border-bottom:1px solid var(--line)}
  .nav nav a:last-child{border-bottom:0}
  .nav.open nav{display:flex}
  .vs,.grid3,.plans{grid-template-columns:1fr}
  .section{padding:64px 0}
  .pain{padding:56px 0}
  .lead{font-size:17px}
  .actions .btn{width:100%}
}
@media (max-width:400px){
  .brand span{font-size:17px}
  .nav .btn.small{padding:8px 11px;font-size:13px}
  .quote{padding:16px}
}
section[id]{scroll-margin-top:76px}

/* ===== Animation ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@keyframes cardIn{from{opacity:0;transform:translateY(28px) scale(.97)}to{opacity:1;transform:none}}
@keyframes rowIn{from{opacity:0;transform:translateX(14px)}to{opacity:1;transform:none}}
@keyframes popIn{0%{opacity:0;transform:scale(.92)}70%{opacity:1;transform:scale(1.02)}100%{opacity:1;transform:none}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@keyframes ring{0%{box-shadow:0 0 0 0 rgba(41,71,224,.45)}100%{box-shadow:0 0 0 12px rgba(41,71,224,0)}}
@keyframes shine{from{transform:translateX(-120%) skewX(-20deg)}to{transform:translateX(320%) skewX(-20deg)}}
@keyframes underline{from{transform:scaleX(0)}to{transform:scaleX(1)}}

/* hero vào trang */
.js .herotext>*{opacity:0;animation:fadeUp .7s cubic-bezier(.2,.7,.2,1) forwards}
.js .herotext>*:nth-child(1){animation-delay:.05s}
.js .herotext>*:nth-child(2){animation-delay:.15s}
.js .herotext>*:nth-child(3){animation-delay:.28s}
.js .herotext>*:nth-child(4){animation-delay:.4s}
.js .herotext>*:nth-child(5){animation-delay:.52s}
@keyframes mark{to{background-size:100% .16em}}
.hero h1 em{background:linear-gradient(#C9D2FB,#C9D2FB) no-repeat 0 92%/0% .16em;-webkit-box-decoration-break:clone;box-decoration-break:clone;animation:mark .8s .9s cubic-bezier(.2,.7,.2,1) forwards}

/* báo giá mẫu: hiện từng dòng như đang được lập */
.js .quote{opacity:0;animation:cardIn .8s .25s cubic-bezier(.2,.7,.2,1) forwards}
.js .quote.quote-float{opacity:1;animation:float 6s ease-in-out infinite}
.js .quote .qrow,.js .quote .qroom,.js .quote .qcust{opacity:0;animation:rowIn .5s cubic-bezier(.2,.7,.2,1) forwards}
.js .quote .qrow,.js .quote .qroom,.js .quote .qcust{animation-delay:var(--d,1s)}
.js .quote .qhint{opacity:0;animation:popIn .5s 2.35s forwards}
.js .quote .qsum,.js .quote .qbtns{opacity:0;animation:fadeUp .5s 2.6s forwards}
.qbtns .zalo{position:relative;overflow:hidden}
.js .qbtns .zalo{animation:ring 1.6s 3.4s ease-out 3}
.qbtns .zalo:after{content:"";position:absolute;top:0;bottom:0;left:0;width:30%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.45),transparent);transform:translateX(-120%);animation:shine 1.2s 3.2s ease-in-out}

/* hiện dần khi cuộn */
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.2,1) var(--d,0s),transform .7s cubic-bezier(.2,.7,.2,1) var(--d,0s)}
.js .reveal.in{opacity:1;transform:none}

/* hover */
.feat,.plan{transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease,opacity .7s cubic-bezier(.2,.7,.2,1) var(--d,0s)}
.js .feat.reveal,.js .plan.reveal{transition:transform .7s cubic-bezier(.2,.7,.2,1) var(--d,0s),opacity .7s cubic-bezier(.2,.7,.2,1) var(--d,0s),box-shadow .25s ease,border-color .25s ease}
.feat.in:hover,.feat:hover{transform:translateY(-6px);box-shadow:0 14px 34px rgba(20,25,45,.09);border-color:#D9DFFC}
.feat .ico{transition:transform .35s cubic-bezier(.3,1.6,.5,1),background .25s,color .25s}
.feat:hover .ico{transform:rotate(-8deg) scale(1.1);background:var(--primary);color:#fff}
.plan:hover{transform:translateY(-6px);box-shadow:var(--sh)}
.plan.hot.in:hover,.plan.hot:hover{transform:translateY(-8px)}
.btn.primary{position:relative;overflow:hidden}
.btn.primary:after{content:"";position:absolute;top:0;bottom:0;left:0;width:30%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.35),transparent);transform:translateX(-120%)}
.btn.primary:hover:after{animation:shine .8s ease-in-out}
.steps b{transition:transform .3s cubic-bezier(.3,1.6,.5,1)}
.steps li:hover b{transform:scale(1.15)}
.nav{transition:box-shadow .25s}
.nav.scrolled{box-shadow:0 6px 20px rgba(20,25,45,.06)}

/* FAQ mở mượt */
details[open] p{animation:fadeUp .35s ease}

@media (prefers-reduced-motion:reduce){
  *,*:before,*:after{animation:none!important;transition:none!important}
  .js .herotext>*,.js .quote,.js .quote *,.js .reveal{opacity:1!important;transform:none!important}
  .hero h1 em{background-size:100% .16em}
}