:root {
  --ink:#152739; --body:#333333; --muted:#526575; --blue:#1b6ad2; --teal:#1cbaaf;
  --navy:#0d1b2a; --paper:#fff; --wash:#f5faff; --border:#dce6ef; --max:1200px;
  font-family:"Be Vietnam Pro","Segoe UI",system-ui,sans-serif; color:var(--ink); background:var(--paper);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{margin:0;font-size:16px;line-height:1.55}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid #51a9ff;outline-offset:4px}
h1,h2,h3,p,figure{margin:0}
h1,h2,h3{font-weight:700;line-height:1.15;letter-spacing:-.042em}
h2{font-size:clamp(2rem,4vw,3.15rem);text-wrap:balance}
h3{font-size:clamp(1.25rem,2vw,1.63rem)}
p{color:var(--muted)}
.wrap{width:min(var(--max),calc(100% - 80px));margin-inline:auto}
.section{padding-block:84px}
section[id],.solutions[id],.solution[id]{scroll-margin-top:84px}
.skip{position:absolute;top:8px;left:12px;z-index:10;background:#fff;padding:10px;transform:translateY(-160%)}
.skip:focus{transform:none}
.header{position:sticky;top:0;z-index:3;background:#fff;border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:76px}
.brand{display:inline-flex;align-items:center;min-height:44px}
.brand img{width:145px}
nav{display:flex;align-items:center;gap:30px;color:var(--muted)}
nav a{display:inline-flex;align-items:center;min-height:44px}
.nav .mobile-contact{display:none}
nav a:hover,.text-link:hover,.footer a:hover{color:var(--blue)}
.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:12px 19px;min-height:48px;border:1px solid transparent;border-radius:8px;background:var(--blue);color:white;line-height:1.25;transition:background .15s}
.button:hover{background:#165caf}
.button-small{min-height:44px;padding:10px 15px}
.button-ghost{background:transparent;border-color:#68829a;color:#fff}
.button-ghost:hover{background:#ffffff17}
.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.menu-button{display:none;padding:8px 12px;min-height:44px;border:1px solid var(--border);border-radius:8px;background:white;color:var(--ink)}
.hero,.contact{color:white;background:var(--navy)}
.hero{position:relative;overflow:hidden;background:radial-gradient(ellipse at 83% 40%,#123e62 0%,#0d253c 33%,#0d1b2a 74%)}
.hero-grid{display:grid;grid-template-columns:1.08fr 1fr;align-items:center;gap:24px;min-height:535px;padding-block:64px}
.eyebrow{display:flex;gap:9px;align-items:center;color:var(--blue);font-size:.77rem;letter-spacing:.13em;margin-bottom:16px}
.eyebrow span{display:inline-block;width:22px;height:2px;background:var(--teal);flex:none}
.hero-eyebrow{color:#91e9e0}
.hero h1{font-size:clamp(2.65rem,4.55vw,4.45rem);max-width:660px;text-wrap:balance;font-weight:800}
.hero h1 em{font-style:normal;color:#75e7dd;background:linear-gradient(105deg,#8bf4e5 12%,#61b5ff 96%);background-clip:text;-webkit-text-fill-color:transparent}
.hero-copy>p:not(.eyebrow){max-width:510px;color:#d4e1ef;font-size:clamp(1rem,1.5vw,1.16rem);margin:20px 0 28px}
.hero-art{position:relative;min-height:370px;isolation:isolate}
.diagram-caption{position:absolute;top:0;right:0;color:#a9c7de;display:flex;align-items:center;gap:8px;font-size:.7rem;letter-spacing:.14em}
.diagram-caption span{width:6px;height:6px;border-radius:50%;background:#7af7e8}
.orbit{position:absolute;left:50%;top:52%;border-radius:50%;transform:translate(-50%,-50%);aspect-ratio:1}
.orbit-outer{width:min(90%,390px);border:1px solid #4b789965;background:repeating-conic-gradient(from -14deg,#537d9e30 0deg 1deg,transparent 1deg 24deg);mask-image:radial-gradient(transparent 64%,#000 65%)}
.orbit-inner{width:min(72%,310px);border:1px solid #7aabcb55}
.orbit-center{width:min(51%,218px);border:1px solid #87c9e249;background:radial-gradient(#216c9563,transparent 70%);box-shadow:0 0 75px #33bdba18}
.hero-symbol{width:clamp(110px,13vw,175px);position:absolute;top:52%;left:50%;transform:translate(-50%,-50%);filter:drop-shadow(0 12px 32px #0b1b3580)}
.node{display:flex;align-items:center;gap:9px;position:absolute;padding:8px 12px 8px 8px;border:1px solid #527a9b;border-radius:10px;background:#102a43;color:#ecf8ff;font-size:.82rem;box-shadow:0 12px 25px #05132255}
.product-icon{flex:none;width:32px;height:32px;object-fit:contain;border-radius:50%;background:#fff;padding:1px}
.node-s{top:20%;left:2%}.node-c{top:47%;right:0}.node-r{bottom:9%;left:11%}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:28px;margin-bottom:30px}
.section-head>p{max-width:340px}
.solutions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.solution{position:relative;overflow:hidden;display:flex;flex-direction:column;border:1px solid var(--border);border-radius:14px;padding:24px;background:#fff;transition:transform .2s,border-color .2s,box-shadow .2s}
.solution::before{content:"";position:absolute;inset:0 0 auto;height:3px;background:linear-gradient(90deg,var(--blue),var(--teal));opacity:.65;transition:opacity .2s}
.solution:hover,.solution:focus-within{transform:translateY(-3px);border-color:#90b9ea;box-shadow:0 14px 35px #15457512}
.solution:hover::before,.solution:focus-within::before{opacity:1}
.card-top{display:grid;grid-template-rows:52px auto;align-items:center;justify-items:start;gap:8px;margin-bottom:16px}
.product-logo{width:145px;height:42px;object-fit:contain;object-position:left center}
.product-logo.logo-s,.product-logo.logo-r{width:172px;height:52px;margin-left:-12px}
.label{color:#215579;font-size:.78rem;background:#e8f4ff;padding:5px 9px;border-radius:5px;display:inline-block}
.solution h3+p{margin:12px 0 19px}
.solution>a,.demo-copy>a{min-height:44px;display:inline-flex;align-items:center;gap:8px;color:var(--blue);margin-top:auto}
.solution>a:hover,.demo-copy>a:hover{text-decoration:underline}
.demo-section{background:var(--wash);border-block:1px solid var(--border)}
.demo-buttons{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:17px}
.demo-buttons button{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;min-height:44px;border-radius:8px;border:1px solid var(--border);background:#fff;color:var(--ink)}
.demo-buttons .product-icon{width:26px;height:26px}
.demo-buttons button[aria-pressed=true]{color:#fff;border-color:var(--blue);background:var(--blue)}
.demo-panel{display:grid;grid-template-columns:1fr 1fr;overflow:hidden;border:1px solid var(--border);border-radius:14px;background:white;min-height:345px}
.demo-panel:not([hidden]) + .demo-panel{margin-top:16px}
.demo-copy{padding:clamp(22px,4vw,42px)}
.demo-copy h3{margin:13px 0 18px}
dl{margin:0 0 12px}
dl div{display:grid;grid-template-columns:76px 1fr;gap:8px;padding:7px 0;border-top:1px solid var(--border)}
dt{color:var(--ink)}dd{margin:0;color:var(--muted)}
.demo-visual{display:grid;place-items:center;min-width:0;padding:20px;background:#e8f4ff}
.demo-visual img{max-height:380px;width:auto;object-fit:contain;border-radius:8px}
.workflow{display:flex;flex-direction:column;justify-content:center;align-items:stretch;padding:25px clamp(20px,6vw,80px)}
.workflow div{display:grid;gap:3px;background:white;border:1px solid #c7e1f8;padding:10px 16px;border-radius:8px}
.workflow small{font-size:.66rem;letter-spacing:.09em;color:var(--blue)}
.workflow strong,.steps strong{font-weight:400}
.workflow div span{font-size:.85rem;color:var(--muted)}
.flow-line{align-self:center;color:var(--blue)}
.about{display:grid;grid-template-columns:1fr 1fr;gap:75px;align-items:start}
.about h2+p{margin-top:16px;max-width:440px}
.steps{list-style:none;margin:0;padding:0;border-top:1px solid var(--border)}
.steps li{display:grid;grid-template-columns:40px 1fr;gap:14px;border-bottom:1px solid var(--border);padding:16px 0}
.steps li>span{color:var(--blue)}
.steps p{margin-top:3px}
.contact{padding:72px 0;background:linear-gradient(110deg,#0d1b2a,#123651)}
.contact-grid{display:grid;grid-template-columns:1fr 1.04fr;gap:48px;align-items:center}
.contact-copy>p:not(.eyebrow){color:#d4e1ef;margin:14px 0 18px}
.contact-links{display:flex;flex-direction:column;align-items:start}
.zalo-qr{display:inline-flex;align-items:center;gap:12px;margin-top:13px;padding:8px 13px 8px 8px;border:1px solid #567894;border-radius:11px;background:#ffffff0b;color:white}
.zalo-qr img{width:88px;height:auto;border-radius:5px;background:#fff}
.zalo-qr span{display:grid;gap:4px}
.zalo-qr small{color:#bfe3f7}
.contact-links a{display:inline-flex;align-items:center;min-height:44px;color:#a3f2e8}
.contact-form{color:var(--ink);background:#fff;border-radius:14px;padding:26px}
.contact-form h3{margin-bottom:16px}
form,label{display:grid;gap:7px}
form{gap:12px}
.input-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
input,select,textarea{min-width:0;min-height:44px;border:1px solid #a8bac9;border-radius:7px;padding:8px 10px;background:#fff;color:var(--ink)}
textarea{resize:vertical}
.form-note{font-size:.87rem}
.form-note:empty{display:none}
.text-link{color:var(--blue);display:inline-flex;align-items:center;min-height:44px;padding-inline:5px}
.footer{padding-top:34px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px;padding-bottom:25px}
.footer-grid>div{display:flex;flex-direction:column;align-items:start}
.footer-grid a:not(.brand){display:inline-flex;align-items:center;min-height:44px;color:var(--muted)}
.footer-grid strong{font-weight:400;margin-top:9px}
.footer-bottom{display:flex;justify-content:space-between;gap:15px;padding-block:16px;border-top:1px solid var(--border);color:var(--muted)}
@media(max-width:900px){.wrap{width:calc(100% - 48px)}.nav{gap:12px}nav{gap:14px;font-size:.88rem}.hero-grid{gap:10px;min-height:480px}.section{padding-block:62px}.hero-art{min-height:320px}.solution{padding:17px}.about{gap:30px}}
@media(max-width:700px){
  .wrap{width:calc(100% - 36px)}.nav{min-height:66px;flex-wrap:wrap;padding-block:8px}.brand img{width:122px}.nav-contact{display:none}.nav nav{width:100%;display:flex;gap:10px;flex-wrap:wrap}.menu-button:not([hidden]){display:inline-flex;gap:9px;align-items:center}.nav.menu-ready nav:not(.open){display:none}.nav nav a{padding-right:10px}.nav .mobile-contact{display:inline-flex}
  .hero-grid,.contact-grid,.about,.demo-panel{grid-template-columns:1fr}.hero-grid{padding-block:43px 22px;gap:14px}.hero-art{min-height:270px}.hero h1{font-size:clamp(2.45rem,10vw,3.8rem)}.hero-copy>p:not(.eyebrow){margin:16px 0 22px}.hero-symbol{width:120px}
  .diagram-caption{top:8px}.node{font-size:.73rem;padding:6px 9px 6px 6px}.node .product-icon{width:26px;height:26px}.node-s{top:17%}.node-c{top:auto;bottom:6%}.node-r{bottom:6%;left:0}
  .section{padding-block:48px}.section-head{display:grid;gap:12px;margin-bottom:23px}.section-head>p{max-width:none}.solutions{grid-template-columns:1fr;gap:12px}.solution{padding:20px}.card-top{margin-bottom:16px}.demo-copy{padding:21px}.demo-visual img{max-height:330px}.about,.contact-grid{gap:25px}.contact{padding:48px 0}.contact-form{padding:18px}.footer-grid{grid-template-columns:1fr 1fr;gap:12px}.footer-grid>div:first-child{grid-column:1/-1}
}
@media(max-width:400px){.input-row{grid-template-columns:1fr}.node{font-size:.69rem}.node-s{left:0}.node-c{right:0}}
@media(prefers-reduced-motion:no-preference){
  .hero-copy,.hero-art{animation:appear .55s ease-out both}
  .hero-art{animation-delay:.1s}
  .demo-panel:not([hidden]) .demo-copy{animation:appear .24s ease-out both}
}
@keyframes appear{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button,.solution,.solution::before{transition:none}.solution:hover,.solution:focus-within{transform:none}}