:root{
  --bg:#06070d; --bg2:#0b0d18; --panel:rgba(255,255,255,.035); --panel2:rgba(255,255,255,.055);
  --line:rgba(255,255,255,.09); --line2:rgba(255,255,255,.16);
  --tx:#e9ecf5; --tx2:#a3aac2; --tx3:#6f7794;
  --a1:#6d5efc; --a2:#17c7ff; --a3:#ff5ea8;
  --ok:#3ddc97; --max:1180px; --r:18px;
  --grad:linear-gradient(100deg,#8b7cff,#17c7ff 55%,#3ddc97);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:86px}
body{margin:0;background:var(--bg);color:var(--tx);
  font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;font-size:16.5px;line-height:1.65;
  -webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,.brand-text,.price,.num,.stat b,.metric b{font-family:"Space Grotesk",Inter,sans-serif;letter-spacing:-.02em}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 20px}
.wrap-narrow{max-width:820px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* background */
.bg-grid{position:fixed;inset:0;z-index:-2;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:62px 62px;mask-image:radial-gradient(circle at 50% 0%,#000 0%,transparent 72%)}
.bg-glow{position:fixed;inset:0;z-index:-3;pointer-events:none;
  background:
   radial-gradient(760px 420px at 12% -6%,rgba(109,94,252,.34),transparent 65%),
   radial-gradient(680px 420px at 92% 6%,rgba(23,199,255,.2),transparent 62%),
   radial-gradient(760px 520px at 50% 110%,rgba(255,94,168,.12),transparent 65%)}

/* nav */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:20px;
  max-width:var(--max);margin:0 auto;padding:14px 20px;transition:.25s}
.nav.scrolled{background:rgba(6,7,13,.78);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);
  max-width:100%;padding:11px max(20px,calc((100vw - var(--max))/2 + 20px))}
.brand{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:600}
.brand-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:9px;
  background:var(--grad);color:#07080f;font-weight:700;font-family:"Space Grotesk",sans-serif}
.brand-text strong{font-weight:700;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:14.5px;color:var(--tx2)}
.nav-links a{position:relative;transition:.2s}
.nav-links a:hover{color:var(--tx)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--grad);transition:.25s}
.nav-links a:hover::after{width:100%}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--tx);border-radius:2px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 24px;border-radius:12px;border:1px solid var(--line2);
  font-size:15px;font-weight:600;cursor:pointer;transition:.22s;white-space:nowrap}
.btn-sm{padding:9px 17px;font-size:14px}
.btn-primary{background:var(--grad);color:#06070d;border-color:transparent;box-shadow:0 10px 32px -12px rgba(109,94,252,.85)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px -12px rgba(109,94,252,.95)}
.btn-ghost{background:var(--panel);color:var(--tx)}
.btn-ghost:hover{background:var(--panel2);border-color:var(--line2);transform:translateY(-2px)}
.btn-full{width:100%;margin-top:6px}

/* hero */
.hero{padding:92px 0 96px;text-align:center}
.pill{display:inline-block;padding:7px 16px;border-radius:999px;border:1px solid var(--line2);
  background:var(--panel);font-size:13.5px;color:var(--tx2);margin-bottom:26px}
.hero h1{font-size:clamp(2.3rem,6vw,4.3rem);line-height:1.06;margin:0 0 22px;font-weight:700}
.lead{max-width:720px;margin:0 auto 34px;font-size:clamp(1rem,1.6vw,1.17rem);color:var(--tx2)}
.lead strong{color:var(--tx)}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:62px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;max-width:860px;margin:0 auto}
.stat{padding:22px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--panel)}
.stat b{display:block;font-size:2.1rem;font-weight:700;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:13px;color:var(--tx3)}

/* sections */
.sec{padding:88px 0}
.sec-alt{background:linear-gradient(180deg,transparent,rgba(255,255,255,.022),transparent)}
.sec-head{text-align:center;max-width:760px;margin:0 auto 46px}
.kicker{display:inline-block;font-size:12.5px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;
  color:var(--a2);margin-bottom:12px}
.sec-head h2{font-size:clamp(1.7rem,3.6vw,2.6rem);margin:0 0 12px;line-height:1.18}
.sub{color:var(--tx2);margin:0;font-size:16px}

/* cards */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:28px;
  transition:.25s;position:relative;overflow:hidden}
.card h3{font-size:1.14rem;margin:0 0 14px;display:flex;align-items:center;gap:9px}
.card p{color:var(--tx2);margin:0;font-size:15.2px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card-problem{border-color:rgba(255,94,168,.22)}
.card-solution{border-color:rgba(61,220,151,.22)}
.ico{font-size:1.05rem}
.list{margin:0;padding-left:0;list-style:none;color:var(--tx2);font-size:15.2px}
.list li{position:relative;padding-left:22px;margin-bottom:11px}
.list li::before{content:"";position:absolute;left:0;top:.62em;width:7px;height:7px;border-radius:50%;background:var(--a1)}
.list-tight li{margin-bottom:8px;font-size:14.8px}

.band{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:22px;
  background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.band-item{background:var(--bg2);padding:20px}
.band-item b{display:block;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--tx3);margin-bottom:6px;font-weight:600}
.band-item span{font-size:14.8px;color:var(--tx)}

.feat:hover{transform:translateY(-5px);border-color:var(--line2);background:var(--panel2)}
.feat::before{content:"";position:absolute;inset:0 0 auto;height:2px;background:var(--grad);opacity:0;transition:.25s}
.feat:hover::before{opacity:1}
.fico{font-size:1.7rem;margin-bottom:12px}

/* steps */
.steps{list-style:none;counter-reset:s;margin:0;padding:0;display:grid;gap:16px}
.steps li{display:grid;grid-template-columns:70px 1fr;grid-template-rows:auto auto;
  column-gap:22px;row-gap:4px;align-items:start;
  padding:24px;border:1px solid var(--line);border-radius:var(--r);background:var(--panel);transition:.25s}
.steps .num{grid-column:1;grid-row:1 / span 2;align-self:center}
.steps h3{grid-column:2;grid-row:1}
.steps p{grid-column:2;grid-row:2}
.steps li:hover{border-color:var(--line2);background:var(--panel2)}
.num{font-size:1.7rem;font-weight:700;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.steps h3{margin:0 0 6px;font-size:1.1rem}
.steps p{margin:0;color:var(--tx2);font-size:15.2px}

/* flow */
.arch .flow{display:grid;gap:7px}
.fnode{padding:11px 15px;border:1px solid var(--line);border-radius:11px;background:rgba(255,255,255,.03);
  font-size:14.2px;text-align:center;color:var(--tx2)}
.fnode.fhl{border-color:rgba(61,220,151,.35);color:var(--tx);background:rgba(61,220,151,.07)}
.fsplit{display:flex;gap:7px;padding:0;border:0;background:none}
.fsplit span{flex:1;padding:10px 4px;border:1px solid var(--line);border-radius:11px;background:rgba(109,94,252,.1);
  font-size:13px;color:var(--tx)}
.farrow{text-align:center;color:var(--tx3);font-size:13px;line-height:1}
.stack-col{display:grid;gap:22px;align-content:start}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tags span{padding:6px 13px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.04);
  font-size:13.2px;color:var(--tx2)}
.tags-ai span{border-color:rgba(23,199,255,.26);background:rgba(23,199,255,.07);color:#bfe9ff}
.card-sec{border-color:rgba(61,220,151,.2)}

/* metrics + quote */
.metric{padding:26px 20px;border:1px solid var(--line);border-radius:var(--r);background:var(--panel);text-align:center}
.metric b{display:block;font-size:2.15rem;font-weight:700;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.metric span{font-size:13.6px;color:var(--tx3)}
.quote{margin:30px auto 0;max-width:840px;padding:30px 34px;border-left:3px solid var(--a1);
  background:var(--panel);border-radius:0 var(--r) var(--r) 0;font-size:17px;color:var(--tx2);font-style:italic}
.quote cite{display:block;margin-top:14px;font-size:14px;color:var(--tx3);font-style:normal}

/* timeline */
.timeline{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.tl{padding:22px 20px;border:1px solid var(--line);border-radius:var(--r);background:var(--panel);
  border-top:3px solid var(--line2);transition:.25s}
.tl:hover{transform:translateY(-4px)}
.tl.done{border-top-color:var(--ok)}
.tl.now{border-top-color:var(--a2);background:rgba(23,199,255,.06)}
.tl b{font-size:12.5px;letter-spacing:.09em;text-transform:uppercase;color:var(--tx3)}
.tl h3{margin:8px 0 8px;font-size:1.03rem}
.tl p{margin:0 0 14px;font-size:14.3px;color:var(--tx2)}
.badge{display:inline-block;padding:4px 11px;border-radius:999px;font-size:11.8px;font-weight:600;
  border:1px solid var(--line2);color:var(--tx3)}
.badge-done{border-color:rgba(61,220,151,.4);color:var(--ok);background:rgba(61,220,151,.1)}
.badge-now{border-color:rgba(23,199,255,.45);color:var(--a2);background:rgba(23,199,255,.12)}

/* pricing */
.pricing .plan{display:flex;flex-direction:column}
.plan .list{flex:1;margin-bottom:18px}
.plan-hot{border-color:rgba(109,94,252,.55);background:linear-gradient(180deg,rgba(109,94,252,.13),var(--panel));
  box-shadow:0 24px 60px -30px rgba(109,94,252,.8)}
.tag-hot{position:absolute;top:16px;right:16px;padding:4px 11px;border-radius:999px;background:var(--grad);
  color:#06070d;font-size:11.5px;font-weight:700}
.price{font-size:1.95rem;font-weight:700;margin:4px 0 18px;line-height:1.2}
.price small{display:block;font-size:13.5px;font-weight:500;color:var(--tx3);font-family:Inter,sans-serif}

/* faq */
.faq{border:1px solid var(--line);border-radius:14px;background:var(--panel);margin-bottom:11px;overflow:hidden}
.faq summary{padding:17px 22px;cursor:pointer;font-weight:600;font-size:15.6px;list-style:none;
  display:flex;justify-content:space-between;gap:14px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.3rem;color:var(--a2);line-height:1;transition:.2s}
.faq[open] summary::after{transform:rotate(45deg)}
.faq p{margin:0;padding:0 22px 19px;color:var(--tx2);font-size:15px}

/* contact */
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:22px}
.ci-desc{margin-bottom:20px!important}
.ci-list{list-style:none;margin:0 0 22px;padding:0;display:grid;gap:15px}
.ci-list li{display:flex;gap:13px;align-items:flex-start}
.ci-ico{width:36px;height:36px;flex:0 0 36px;display:grid;place-items:center;border-radius:10px;
  background:rgba(109,94,252,.14);border:1px solid rgba(109,94,252,.3);font-size:15px}
.ci-list b{display:block;font-size:11.8px;letter-spacing:.1em;text-transform:uppercase;color:var(--tx3);font-weight:600}
.ci-list a,.ci-list div span{font-size:15.2px;color:var(--tx)}
.ci-list a:hover{color:var(--a2)}
.contact-form label{display:block;font-size:13.4px;color:var(--tx2);margin-bottom:14px;font-weight:500}
.contact-form label span{color:var(--a3)}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.contact-form input,.contact-form select,.contact-form textarea{
  width:100%;margin-top:6px;padding:12px 14px;border-radius:11px;border:1px solid var(--line);
  background:rgba(255,255,255,.04);color:var(--tx);font-family:inherit;font-size:15px;transition:.2s}
.contact-form textarea{resize:vertical}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{
  outline:none;border-color:var(--a1);background:rgba(109,94,252,.07);box-shadow:0 0 0 3px rgba(109,94,252,.14)}
.contact-form select option{background:var(--bg2);color:var(--tx)}
.f-note{margin-top:12px!important;font-size:12.6px;color:var(--tx3);text-align:center}

/* footer */
.footer{border-top:1px solid var(--line);padding:46px 0 26px;margin-top:20px;background:rgba(0,0,0,.25)}
.footer-in{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;align-items:flex-start}
.f-small{margin:14px 0 0;font-size:14px;color:var(--tx3);line-height:1.8}
.f-small a:hover{color:var(--a2)}
.f-nav{display:flex;flex-wrap:wrap;gap:10px 24px;font-size:14.4px;color:var(--tx2)}
.f-nav a:hover{color:var(--tx)}
.f-bottom{margin-top:34px;padding-top:20px;border-top:1px solid var(--line);font-size:13.2px;color:var(--tx3);text-align:center}

/* reveal (chi an khi JS da san sang -> khong bao gio ket o trang thai an) */
.js-reveal .reveal{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
.js-reveal .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.js-reveal .reveal{opacity:1!important;transform:none!important;transition:none}html{scroll-behavior:auto}}

/* responsive */
@media(max-width:1000px){
  .grid-3,.timeline{grid-template-columns:repeat(2,1fr)}
  .grid-4,.stats,.band{grid-template-columns:repeat(2,1fr)}
  .two-col,.contact-grid{grid-template-columns:1fr}
}
@media(max-width:760px){
  body{font-size:16px}
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;
    background:rgba(8,9,17,.98);backdrop-filter:blur(16px);border-block:1px solid var(--line);padding:8px 20px}
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 0;border-bottom:1px solid var(--line)}
  .nav-links a:last-child{border-bottom:0}
  .nav-toggle{display:flex;order:3}
  .nav .btn-sm{margin-left:auto}
  .nav{position:relative;flex-wrap:wrap}
  .nav.scrolled{position:sticky}
  .hero{padding:58px 0 66px}
  .sec{padding:62px 0}
  .grid-3,.grid-4,.timeline,.stats,.f-row,.band{grid-template-columns:1fr}
  .steps li{grid-template-columns:1fr;grid-template-rows:auto;gap:6px}
  .steps .num,.steps h3,.steps p{grid-column:1;grid-row:auto}
  .card{padding:22px}
  .quote{padding:22px 20px;font-size:15.6px}
}