:root{
  --ink:#1A1C1E;
  --steel:#2B2F33;
  --steel-light:#3D4348;
  --red:#D94A39;
  --red-deep:#B93A2B;
  --green:#0D7B3E;
  --green-deep:#0A6432;
  --paper:#F6F5F2;
  --paper-deep:#EAE8E2;
  --white:#FFFFFF;
  --slate:#5B6167;
  --line:rgba(26,28,30,.12);
  --line-light:rgba(255,255,255,.16);
  --sans:"Inter",Helvetica,Arial,sans-serif;
  --head:"Oswald","Inter",Helvetica,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;cursor:pointer}
::selection{background:var(--red);color:var(--white)}

h1,h2,h3,h4{
  font-family:var(--head);
  font-weight:600;
  line-height:1.08;
  letter-spacing:.01em;
  color:inherit;
  text-transform:uppercase;
}
h1{font-size:clamp(2.4rem,4.8vw,4rem)}
h2{font-size:clamp(1.9rem,3.2vw,2.6rem)}
h3{font-size:1.25rem}
p{color:var(--slate)}

.container{max-width:1200px;margin:0 auto;padding:0 24px}
.eyebrow{
  font-family:var(--head);
  font-size:.85rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  font-weight:600;
  color:var(--red);
  display:flex;
  align-items:center;
  gap:12px;
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:26px;height:3px;background:var(--green)}

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:14px 28px;
  font-family:var(--head);
  font-size:.95rem;
  font-weight:600;
  letter-spacing:.05em;
  text-transform:uppercase;
  border:2px solid transparent;
  transition:all .18s ease;
}
.btn-primary{background:var(--red);color:var(--white)}
.btn-primary:hover{background:var(--red-deep)}
.btn-outline{border-color:var(--ink);color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:var(--white)}
.btn-outline-light{border-color:var(--line-light);color:var(--white)}
.btn-outline-light:hover{background:var(--white);color:var(--ink)}

/* Utility top bar */
.top-bar{background:var(--red);color:rgba(255,255,255,.92);font-size:.82rem}
.top-bar-inner{
  max-width:1200px;margin:0 auto;padding:8px 24px;
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
}
.top-bar a{color:inherit}
.top-bar a:hover{color:#fff}
.top-contacts{display:flex;gap:20px;flex-wrap:wrap}
.top-contacts span{display:inline-flex;align-items:center;gap:6px}
.top-contacts svg{width:14px;height:14px}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:var(--white);box-shadow:0 1px 0 var(--line)}
.header-bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 24px;max-width:1200px;margin:0 auto;gap:24px;
}
.logo{display:flex;align-items:center;gap:12px;flex-shrink:0}
.logo img{height:78px;width:auto}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-text .lt-main{font-family:var(--head);font-weight:700;font-size:1.1rem;color:var(--ink);letter-spacing:.01em}
.logo-text .lt-sub{font-size:.72rem;color:var(--slate);letter-spacing:.02em}

.nav{display:flex;align-items:center;gap:24px}
.nav-links{display:flex;gap:4px}
.nav-links a{
  font-family:var(--head);font-size:.85rem;font-weight:600;letter-spacing:.03em;
  text-transform:uppercase;color:var(--ink);padding:10px 12px;
  border-bottom:2px solid transparent;transition:color .15s ease,border-color .15s ease;
}
.nav-links a:hover,.nav-links a.active{color:var(--red);border-color:var(--red)}
.nav-toggle{display:none;background:none;border:none;color:var(--ink)}
.nav-toggle svg{width:26px;height:26px}

.lang-switch{
  position:relative;display:inline-flex;align-items:center;
  background:var(--paper-deep);border-radius:6px;padding:3px;width:78px;height:32px;flex-shrink:0;
}
.lang-switch-thumb{
  position:absolute;top:3px;left:3px;width:calc(50% - 3px);height:calc(100% - 6px);
  background:var(--green);border-radius:4px;transition:transform .28s cubic-bezier(.65,0,.35,1);
}
.lang-switch.is-vi .lang-switch-thumb{transform:translateX(100%)}
.lang-switch button{
  position:relative;z-index:2;flex:1;background:none;border:none;
  font-family:var(--head);font-size:.7rem;font-weight:700;letter-spacing:.03em;
  color:var(--slate);height:100%;
}
.lang-switch button.active{color:var(--white)}

@media(max-width:1080px){
  .nav-links{display:none}
  .nav-toggle{display:block}
}

.mobile-nav{
  position:fixed;inset:0 0 0 auto;width:280px;background:var(--ink);
  transform:translateX(100%);transition:transform .25s ease;z-index:200;
  padding:80px 26px 28px;display:flex;flex-direction:column;gap:18px;overflow-y:auto;
  box-shadow:-8px 0 30px rgba(0,0,0,.25);
}
.mobile-nav.open{transform:translateX(0)}
.mobile-nav a{
  font-family:var(--head);font-weight:600;font-size:.92rem;letter-spacing:.03em;
  text-transform:uppercase;color:rgba(255,255,255,.82);
}
.mobile-nav a.active{color:var(--red)}
.mobile-nav .btn{margin-top:8px}
.mobile-close{position:absolute;top:22px;right:22px;background:none;border:none;color:#fff}
.mobile-close svg{width:24px;height:24px}
.nav-scrim{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:190;opacity:0;pointer-events:none;transition:opacity .25s ease}
.nav-scrim.open{opacity:1;pointer-events:auto}

/* Hero */
.hero{position:relative;overflow:hidden;min-height:560px;display:flex;align-items:center;padding:70px 0}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(26,28,30,.88) 0%,rgba(26,28,30,.6) 50%,rgba(26,28,30,.28) 100%)}
.hero-inner{position:relative;z-index:1;max-width:680px}
.hero h1{color:var(--white);margin-bottom:18px}
.hero p.lede{color:rgba(255,255,255,.82);font-size:1.08rem;max-width:560px;margin-bottom:30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}

/* Page header */
.page-header{padding:64px 0 46px;background:var(--ink);color:var(--white)}
.page-header h1{color:var(--white);font-size:clamp(2rem,3.4vw,2.8rem)}
.page-header p{color:rgba(255,255,255,.72);max-width:640px;margin-top:14px;font-size:1.02rem}
.breadcrumb{font-size:.8rem;color:rgba(255,255,255,.55);margin-bottom:16px;text-transform:uppercase;letter-spacing:.05em}
.breadcrumb a:hover{color:var(--red)}

/* Sections */
.section{padding:88px 0}
.section-tight{padding:60px 0}
.section-alt{background:var(--white)}
.section-dark{background:var(--ink);color:var(--white)}
.section-dark h2,.section-dark h3,.section-dark h4{color:var(--white)}
.section-dark p{color:rgba(255,255,255,.68)}
.section-dark .eyebrow{color:var(--red)}
.section-head{max-width:660px;margin-bottom:48px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head.center .eyebrow{justify-content:center}
.section-head.center .eyebrow::before{display:none}

/* Grids */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* Cards */
.card{background:var(--white);border:1px solid var(--line);padding:32px 28px;transition:box-shadow .18s ease,border-color .18s ease}
.card p{color:var(--slate)}
.card:hover{box-shadow:0 14px 34px rgba(26,28,30,.08);border-color:rgba(26,28,30,.2)}
.card .icon{width:44px;height:44px;color:var(--red);margin-bottom:18px}
.card h3{font-size:1.1rem;margin-bottom:10px}
.card p{font-size:.94rem}

.section-dark .card{background:rgba(255,255,255,.05);border-color:var(--line-light);color:var(--white)}
.section-dark .card h3{color:var(--white)}
.section-dark .card p{color:rgba(255,255,255,.65)}
.section-dark .card .icon{color:var(--green)}

/* Service cards with number */
.service-card{background:var(--white);border:1px solid var(--line);padding:34px 28px;position:relative;transition:border-color .18s ease,transform .18s ease}
.service-card:hover{border-color:var(--red);transform:translateY(-3px)}
.service-card .num{font-family:var(--head);font-size:2.4rem;font-weight:700;color:var(--paper-deep);margin-bottom:6px}
.service-card h3{font-size:1.1rem;margin-bottom:10px}
.service-card p{font-size:.92rem}

/* Project gallery */
.project-card{position:relative;overflow:hidden;aspect-ratio:4/3;display:flex;align-items:flex-end}
.project-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.project-card:hover img{transform:scale(1.05)}
.project-card .overlay{position:absolute;inset:0;background:linear-gradient(0deg,rgba(26,28,30,.88) 0%,rgba(26,28,30,.1) 60%)}
.project-card .p-label{position:relative;z-index:2;padding:18px 20px;color:var(--white)}
.project-card .p-tag{font-family:var(--head);font-size:.68rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--red);margin-bottom:4px;display:block}
.project-card .p-name{font-family:var(--head);font-weight:600;font-size:.95rem;text-transform:none;letter-spacing:0;line-height:1.3}

/* Feature list */
.feature-row{display:flex;gap:18px;align-items:flex-start;margin-bottom:28px}
.feature-row .icon{width:36px;height:36px;color:var(--red);flex-shrink:0}
.feature-row h4{font-size:1.05rem;margin-bottom:6px;text-transform:none}
.feature-row p{font-size:.94rem}

/* Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
@media(max-width:880px){.split{grid-template-columns:1fr}}
.split-media{aspect-ratio:1/1;position:relative;overflow:hidden}
.split-media img{width:100%;height:100%;object-fit:cover}

/* Timeline */
.timeline{border-left:2px solid var(--line);padding-left:30px;margin-top:10px}
.timeline-item{margin-bottom:34px;position:relative}
.timeline-item::before{content:"";position:absolute;left:-36px;top:4px;width:10px;height:10px;border-radius:50%;background:var(--red)}
.timeline-item .year{font-family:var(--head);font-weight:700;color:var(--red);font-size:1.1rem;margin-bottom:4px}

/* Table */
.spec-table{width:100%;border-collapse:collapse;margin:24px 0}
.spec-table th,.spec-table td{text-align:left;padding:14px 18px;border-bottom:1px solid var(--line);font-size:.94rem}
.spec-table th{font-family:var(--head);text-transform:uppercase;letter-spacing:.04em;font-size:.8rem;color:var(--red);background:var(--paper-deep);font-weight:600}

/* CTA band */
.cta-band{background:var(--red);color:var(--white);padding:64px 0;text-align:center}
.cta-band h2{color:var(--white)}
.cta-band p{color:rgba(255,255,255,.88);max-width:560px;margin:16px auto 30px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px}
@media(max-width:880px){.contact-grid{grid-template-columns:1fr}}
.field{margin-bottom:20px}
.field label{display:block;font-family:var(--head);font-size:.82rem;font-weight:600;letter-spacing:.03em;text-transform:uppercase;margin-bottom:8px;color:var(--ink)}
.field input,.field textarea,.field select{
  width:100%;padding:13px 16px;border:1px solid var(--line);background:var(--white);
  font-family:var(--sans);font-size:.96rem;color:var(--ink);
}
.field input:focus,.field textarea:focus,.field select:focus{outline:2px solid var(--red);outline-offset:1px}
.contact-info-item{display:flex;gap:16px;margin-bottom:28px}
.contact-info-item .icon{width:26px;height:26px;color:var(--red);flex-shrink:0}
.contact-info-item h4{font-size:1rem;margin-bottom:4px;text-transform:none}
.contact-info-item p{font-size:.94rem}

/* Footer */
.site-footer{background:var(--ink);color:rgba(255,255,255,.65);padding:70px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:50px}
@media(max-width:800px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.footer-grid{grid-template-columns:1fr}}
.footer-grid h4{color:var(--white);font-size:.85rem;letter-spacing:.06em;margin-bottom:18px;text-transform:uppercase;font-family:var(--head)}
.footer-grid ul li{margin-bottom:10px;font-size:.9rem}
.footer-grid ul li a:hover{color:var(--red)}
.footer-bottom{
  border-top:1px solid var(--line-light);padding-top:26px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.8rem;
}
.footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-logo img{height:60px;filter:brightness(0) invert(1)}
.footer-grid > div:first-child p{max-width:320px;font-size:.92rem}

/* Partners grid */
.partners-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.partner-tile{
  background:var(--white);display:flex;align-items:center;justify-content:center;
  aspect-ratio:3/2;padding:18px;
}
.partner-tile img{max-width:100%;max-height:100%;object-fit:contain;filter:grayscale(100%);opacity:.72;transition:filter .2s ease,opacity .2s ease}
.partner-tile:hover img{filter:grayscale(0%);opacity:1}
@media(max-width:900px){.partners-grid{grid-template-columns:repeat(4,1fr)}}
@media(max-width:600px){.partners-grid{grid-template-columns:repeat(3,1fr)}}

@media(max-width:600px){
  .hero{min-height:460px;padding:56px 0}
  .top-contacts span:nth-child(3){display:none}
}