:root{
  --teal:#1fa5bd;
  --teal-dark:#127a8e;
  --teal-deep:#0b4f5c;
  --teal-soft:#e6f6f9;
  --green:#3aa34a;
  --ink:#10232a;
  --muted:#5b6f76;
  --line:#dbe7ea;
  --bg:#ffffff;
  --bg-alt:#f5fafb;
  --radius:18px;
  --shadow:0 10px 30px rgba(11,79,92,.08);
  --max:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* language toggle */
body.lang-en .vi{display:none!important}
body:not(.lang-en) .en{display:none!important}

/* topbar */
.topbar{background:var(--teal-deep);color:#cfe9ee;font-size:13.5px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:38px;flex-wrap:wrap}
.topbar a{color:#fff;font-weight:600}
.topbar .tb-left{display:flex;gap:22px;flex-wrap:wrap}

/* header */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
header.site .container{display:flex;align-items:center;justify-content:space-between;height:74px;gap:20px}
.brand{display:flex;align-items:center;gap:12px}
.brand img{width:46px;height:46px;border-radius:10px}
.brand b{display:block;font-size:19px;letter-spacing:.5px;color:var(--teal-dark);line-height:1.1}
.brand small{display:block;font-size:10.5px;letter-spacing:1.2px;color:var(--muted);text-transform:uppercase}
nav.main ul{display:flex;gap:26px}
nav.main a{font-weight:500;font-size:15px;color:var(--ink);transition:color .2s}
nav.main a:hover{color:var(--teal)}
.h-actions{display:flex;align-items:center;gap:12px}
.lang-switch{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden}
.lang-switch button{border:0;background:none;padding:6px 12px;font:600 13px inherit;font-family:inherit;cursor:pointer;color:var(--muted)}
.lang-switch button.active{background:var(--teal);color:#fff}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:999px;font-weight:600;font-size:15px;border:2px solid transparent;cursor:pointer;transition:all .2s;font-family:inherit}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-dark)}
.btn-outline{border-color:var(--teal);color:var(--teal-dark);background:#fff}
.btn-outline:hover{background:var(--teal-soft)}
.btn-light{background:#fff;color:var(--teal-deep)}
.btn-light:hover{background:var(--teal-soft)}
.btn svg{width:18px;height:18px}
.menu-toggle{display:none;background:none;border:0;cursor:pointer;padding:6px}
.menu-toggle svg{width:28px;height:28px}

/* hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#f2fbfd 0%,#ffffff 55%,#eef8f0 100%)}
.hero::before{content:"";position:absolute;width:620px;height:620px;border-radius:50%;background:radial-gradient(circle,rgba(31,165,189,.18),transparent 70%);right:-160px;top:-160px}
.hero .container{position:relative;display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center;padding-top:80px;padding-bottom:90px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:1.2px;text-transform:uppercase;color:var(--teal-dark);background:var(--teal-soft);padding:6px 14px;border-radius:999px}
.eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--green)}
.hero h1{font-size:clamp(34px,4.6vw,56px);line-height:1.12;margin:18px 0 18px;letter-spacing:-.5px}
.hero h1 em{font-style:normal;color:var(--teal)}
.hero p.lead{font-size:18px;color:var(--muted);max-width:560px}
.hero .cta{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.hero-trust{display:flex;gap:28px;margin-top:38px;flex-wrap:wrap}
.hero-trust div{font-size:14px;color:var(--muted)}
.hero-trust b{display:block;font-size:26px;color:var(--teal-deep);line-height:1.2}
.hero-visual{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.hero-visual figure{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#fff}
.hero-visual img{width:100%;height:100%;object-fit:cover}
.hero-visual .tall{grid-row:span 2}
.hero-visual figure{aspect-ratio:1/1}
.hero-visual .tall{aspect-ratio:auto}
.hero-visual .tall img{object-fit:contain;padding:16px}

/* sections */
section{padding:96px 0}
.alt{background:var(--bg-alt)}
.sec-head{text-align:center;max-width:720px;margin:0 auto 54px}
.sec-head h2{font-size:clamp(28px,3.4vw,40px);line-height:1.2;margin:14px 0 14px;letter-spacing:-.3px}
.sec-head p{color:var(--muted);font-size:17px}

/* stats */
.stats{background:var(--teal-deep);color:#fff;padding:46px 0}
.stats .container{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stats b{display:block;font-size:38px;line-height:1.1;color:#7fe0f0}
.stats span{font-size:14.5px;color:#cfe9ee}

/* about */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.about-grid h2{font-size:clamp(28px,3.2vw,38px);line-height:1.2;margin:14px 0 18px}
.about-grid p{color:var(--muted);margin-bottom:14px}
.letter{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow);position:relative}
.letter::before{content:"\201C";position:absolute;top:-8px;left:22px;font-size:90px;color:var(--teal);opacity:.25;font-family:Georgia,serif;line-height:1}
.letter h3{font-size:20px;color:var(--teal-dark);margin-bottom:12px}
.letter p{font-size:15px;color:var(--muted);margin-bottom:10px}
.letter .sign{margin-top:16px;font-weight:600;color:var(--ink);font-size:15px}
.letter .sign small{display:block;font-weight:400;color:var(--muted)}
.values{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
.values li{display:flex;gap:10px;align-items:flex-start;font-size:15px;font-weight:500}
.values li::before{content:"";flex:none;margin-top:6px;width:16px;height:16px;border-radius:50%;background:var(--teal-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23127a8e' stroke-width='3'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center/11px no-repeat}

/* product categories nav */
.cat-tabs{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-bottom:46px}
.cat-tabs a{padding:10px 20px;border-radius:999px;border:1px solid var(--line);background:#fff;font-weight:600;font-size:14.5px;color:var(--teal-deep)}
.cat-tabs a:hover{border-color:var(--teal);background:var(--teal-soft)}

.product-block{background:#fff;border:1px solid var(--line);border-radius:24px;padding:42px;margin-bottom:34px;box-shadow:var(--shadow)}
.pb-top{display:grid;grid-template-columns:340px 1fr;gap:42px;align-items:start}
.pb-media{display:grid;gap:12px}
.pb-media img{border-radius:14px;width:100%;aspect-ratio:4/3;object-fit:cover}
.pb-tag{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:var(--green);margin-bottom:6px}
.pb-info h3{font-size:30px;line-height:1.2;color:var(--teal-deep);margin-bottom:12px}
.pb-info>p{color:var(--muted);margin-bottom:20px}
.pb-cols{display:grid;grid-template-columns:1.25fr 1fr;gap:26px}
.pb-cols h4{font-size:14px;text-transform:uppercase;letter-spacing:1px;color:var(--teal-dark);margin-bottom:10px}
.pb-cols ul.adv li{position:relative;padding-left:24px;margin-bottom:7px;font-size:15px}
.pb-cols ul.adv li::before{content:"";position:absolute;left:0;top:6px;width:14px;height:14px;border-radius:4px;background:var(--teal)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips li{background:var(--teal-soft);color:var(--teal-deep);font-size:13.5px;font-weight:500;padding:6px 12px;border-radius:999px}
.spec-highlight{display:flex;gap:14px;margin-top:20px;flex-wrap:wrap}
.spec-highlight div{border:1px dashed var(--teal);border-radius:12px;padding:10px 16px;font-size:13.5px;color:var(--muted)}
.spec-highlight b{display:block;color:var(--teal-deep);font-size:18px}
.pb-gallery{margin-top:34px;padding-top:30px;border-top:1px solid var(--line)}
.pb-gallery h4{font-size:15px;margin-bottom:16px;color:var(--ink)}
.grid-products{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:16px}
.p-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:transform .2s,box-shadow .2s;display:flex;flex-direction:column}
.p-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.p-card .ph{aspect-ratio:1/1;display:flex;align-items:center;justify-content:center;padding:12px;background:#fff}
.p-card .ph img{max-height:100%;object-fit:contain}
.p-card .pt{padding:10px 12px 12px;font-size:13.5px;font-weight:600;line-height:1.35;border-top:1px solid var(--line);flex:1}
.p-card .pt small{display:block;font-weight:400;color:var(--muted);font-size:12.5px;margin-top:2px}
.custom-note{margin-top:18px;font-size:14px;color:var(--muted);background:var(--bg-alt);border-left:4px solid var(--green);padding:12px 16px;border-radius:8px}

/* industries */
.ind-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.ind{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;transition:all .2s}
.ind:hover{border-color:var(--teal);transform:translateY(-3px);box-shadow:var(--shadow)}
.ind .ic{width:48px;height:48px;border-radius:12px;background:var(--teal-soft);display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.ind .ic svg{width:26px;height:26px;stroke:var(--teal-dark)}
.ind h3{font-size:17px;margin-bottom:6px}
.ind p{font-size:14px;color:var(--muted)}

/* why / process */
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.why{padding:30px;border-radius:var(--radius);background:#fff;border:1px solid var(--line)}
.why .num{font-size:14px;font-weight:700;color:var(--teal)}
.why h3{font-size:19px;margin:8px 0}
.why p{color:var(--muted);font-size:15px}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:s;margin-top:60px}
.step{position:relative;padding-top:58px}
.step::before{counter-increment:s;content:counter(s);position:absolute;top:0;left:0;width:44px;height:44px;border-radius:50%;background:var(--teal);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:18px}
.step::after{content:"";position:absolute;top:22px;left:54px;right:-12px;height:2px;background:repeating-linear-gradient(90deg,var(--teal) 0 6px,transparent 6px 12px)}
.step:last-child::after{display:none}
.step h3{font-size:17px;margin-bottom:6px}
.step p{font-size:14.5px;color:var(--muted)}

/* comparison table */
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);background:#fff}
table.compare{width:100%;border-collapse:collapse;font-size:15px;min-width:720px}
table.compare th,table.compare td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
table.compare thead th{background:var(--teal-deep);color:#fff;font-weight:600}
table.compare tbody tr:last-child td{border-bottom:0}
table.compare td:first-child{font-weight:600;color:var(--teal-deep)}

/* faq */
.faq{max-width:820px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:12px;padding:0 22px}
.faq summary{cursor:pointer;list-style:none;padding:18px 0;font-weight:600;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--teal);line-height:1}
.faq details[open] summary::after{content:"−"}
.faq details p{padding-bottom:18px;color:var(--muted)}

/* CTA banner */
.cta-band{background:linear-gradient(120deg,var(--teal-dark),var(--teal));color:#fff;border-radius:28px;padding:54px;display:grid;grid-template-columns:1.4fr 1fr;gap:30px;align-items:center}
.cta-band h2{font-size:clamp(26px,3vw,36px);line-height:1.2;margin-bottom:10px}
.cta-band p{color:#e1f6fa}
.cta-band .actions{display:flex;flex-direction:column;gap:12px}
.cta-band .phone-big{font-size:26px;font-weight:700;display:flex;align-items:center;gap:10px}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:40px}
.c-info li{display:flex;gap:16px;margin-bottom:22px}
.c-info .ic{flex:none;width:48px;height:48px;border-radius:12px;background:var(--teal-soft);display:flex;align-items:center;justify-content:center}
.c-info .ic svg{width:22px;height:22px;stroke:var(--teal-dark)}
.c-info small{display:block;color:var(--muted);font-size:13px;text-transform:uppercase;letter-spacing:1px}
.c-info a,.c-info span{font-weight:600;font-size:17px}
.map{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);margin-top:10px;aspect-ratio:16/9}
.map iframe{width:100%;height:100%;border:0}
form.quote{background:#fff;border:1px solid var(--line);border-radius:24px;padding:34px;box-shadow:var(--shadow)}
form.quote h3{font-size:22px;margin-bottom:6px}
form.quote>p{color:var(--muted);font-size:14.5px;margin-bottom:20px}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.f-field{margin-bottom:14px}
.f-field label{display:block;font-size:13.5px;font-weight:600;margin-bottom:6px}
.f-field input,.f-field select,.f-field textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font:inherit;font-size:15px;background:var(--bg-alt);color:var(--ink)}
.f-field input:focus,.f-field select:focus,.f-field textarea:focus{outline:2px solid var(--teal);background:#fff;border-color:transparent}
.f-field textarea{min-height:110px;resize:vertical}
form.quote .btn{width:100%}
.form-hint{font-size:12.5px;color:var(--muted);margin-top:10px;text-align:center}

/* footer */
footer.site{background:#082f37;color:#a9c8ce;padding:64px 0 26px;font-size:14.5px}
.f-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:36px}
footer.site h4{color:#fff;font-size:15px;margin-bottom:14px}
footer.site li{margin-bottom:8px}
footer.site a:hover{color:#fff}
footer.site .brand b{color:#fff}
footer.site .brand small{color:#88aab1}
footer.site .about-f{margin-top:14px;max-width:340px}
.f-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:44px;padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px}

/* floating contact */
.float-contact{position:fixed;right:18px;bottom:18px;z-index:60;display:flex;flex-direction:column;gap:10px}
.float-contact a{width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(0,0,0,.18);color:#fff;font-weight:700;font-size:13px}
.float-contact .fc-zalo{background:#0068ff}
.float-contact .fc-call{background:var(--green);animation:pulse 2s infinite}
.float-contact svg{width:24px;height:24px}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(58,163,74,.55)}70%{box-shadow:0 0 0 16px rgba(58,163,74,0)}100%{box-shadow:0 0 0 0 rgba(58,163,74,0)}}

/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.float-contact .fc-call{animation:none}html{scroll-behavior:auto}}

/* responsive */
@media (max-width:1024px){
  .hero .container,.about-grid,.contact-grid,.cta-band{grid-template-columns:1fr}
  .pb-top{grid-template-columns:1fr}
  .pb-media{grid-template-columns:1fr 1fr}
  .ind-grid{grid-template-columns:repeat(2,1fr)}
  .why-grid{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}
  .step::after{display:none}
  .f-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  nav.main{position:fixed;inset:74px 0 auto 0;background:#fff;border-bottom:1px solid var(--line);display:none;padding:10px 20px 20px}
  nav.main.open{display:block}
  nav.main ul{flex-direction:column;gap:0}
  nav.main a{display:block;padding:12px 0;border-bottom:1px solid var(--line)}
  .menu-toggle{display:block}
  .h-actions .btn{display:none}
  .topbar .tb-right{display:none}
}
@media (max-width:640px){
  section{padding:68px 0}
  .container{padding:0 16px}
  .hero .container{padding-top:48px;padding-bottom:60px;gap:36px}
  .stats .container{grid-template-columns:1fr 1fr}
  .product-block{padding:24px 18px}
  .pb-cols{grid-template-columns:1fr}
  .pb-info h3{font-size:24px}
  .grid-products{grid-template-columns:repeat(2,1fr);gap:12px}
  .ind-grid,.why-grid,.steps,.f-grid,.f-row,.values{grid-template-columns:1fr}
  .cta-band{padding:34px 22px}
  form.quote{padding:24px 18px}
  .brand small{display:none}
}