:root{
  --navy:#13335a; --navy-2:#0e2644; --ink:#1b2430; --muted:#566272; --line:#e2e6eb;
  --bg:#fff; --soft:#f4f6f8; --accent:#f0a033; --accent-ink:#9a5a00;
  --radius:16px; --wrap:1160px;
  --font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy)}
h1,h2,h3{line-height:1.25;margin:0 0 .5em;color:var(--navy-2);letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4.2vw,3rem);font-weight:700}
h2{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:700}
h3{font-size:1.15rem;font-weight:600}
p{margin:0 0 1em}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
.center{text-align:center}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:100}
.eyebrow{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.09em;color:var(--accent-ink);margin:0 0 .75em}
.lead{font-size:1.15rem;color:var(--muted);max-width:60ch}
.note{font-size:.85rem;color:var(--muted)}
.mt{margin-top:1.6em}

/* header */
.site-head{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.head-row{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:baseline;gap:8px;text-decoration:none}
.brand small{font-size:.72rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;white-space:nowrap}
.wm{font-size:1.45rem;font-weight:500;letter-spacing:.04em;color:var(--navy-2)}
.wm b{font-weight:700}
.wm i{font-style:normal;color:var(--accent);font-weight:700}
.nav{display:flex;align-items:center;gap:6px}
.nav a{text-decoration:none;color:var(--ink);padding:8px 12px;border-radius:999px;font-size:.95rem;font-weight:500;white-space:nowrap}
.nav a:hover,.nav a[aria-current]{background:var(--soft);color:var(--navy)}
.nav .nav-cta{margin-left:8px}
.nav-toggle{display:none;background:none;border:0;padding:10px;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--navy-2);margin:5px 0;transition:.2s}

/* buttons */
.btn{display:inline-block;text-decoration:none;font-weight:600;font-family:inherit;font-size:1rem;padding:13px 24px;border-radius:999px;border:2px solid transparent;cursor:pointer;transition:transform .15s,background .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--navy);color:#fff}
.btn-primary:hover{background:var(--navy-2)}
.btn-accent{background:var(--accent);color:#2a1a00}
.btn-accent:hover{background:#f4b04f}
.btn-ghost{border-color:var(--navy);color:var(--navy);background:transparent}
.btn-ghost:hover{background:var(--soft)}
.nav .btn-accent{padding:9px 18px;font-size:.92rem}
.nav .btn-accent:hover{background:#f4b04f}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:1.4em}

/* hero */
.hero{background:linear-gradient(180deg,#f7f8fa 0%,#eef1f4 100%);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;padding-top:56px;padding-bottom:56px}
.hero h1 span{display:block;color:var(--navy)}
.hero-art{margin:0;border-radius:24px;overflow:hidden;box-shadow:0 24px 60px rgba(19,51,90,.18);max-height:560px}
.hero-art img{width:100%;height:100%;object-fit:cover;object-position:center top;aspect-ratio:1/1.05}

.trust{background:var(--navy);color:#fff}
.trust-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.trust-row div{padding:18px 12px;text-align:center;border-left:1px solid rgba(255,255,255,.14)}
.trust-row div:first-child{border-left:0}
.trust-row strong{display:block;font-size:1rem}
.trust-row span{font-size:.82rem;opacity:.8}

/* sections */
.sec{padding:72px 0}
.sec-soft{background:var(--soft)}
.sec-head{max-width:720px;margin-bottom:36px}
.page-head{background:linear-gradient(180deg,#f7f8fa,#eef1f4);padding:64px 0 52px}
.page-head h1{max-width:20ch}

.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:36px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.card-img{aspect-ratio:4/3;overflow:hidden;background:var(--soft)}
.card-img img{width:100%;height:100%;object-fit:cover}
.card-body{padding:22px}
.tag{display:inline-block;font-size:.75rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--accent-ink);background:#fff4e3;padding:4px 10px;border-radius:999px;margin-bottom:10px}
.models{color:var(--muted);font-size:.92rem;margin:0}

.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feat{margin:0;background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.feat-img{aspect-ratio:4/5;overflow:hidden;background:#fff}
.feat-img img{width:100%;height:100%;object-fit:cover;object-position:center}
.feat figcaption{padding:16px 18px 20px}
.feat strong{display:block;color:var(--navy-2);margin-bottom:4px}
.feat span{color:var(--muted);font-size:.93rem}

.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split.rev>:first-child{order:2}
.split-img img{border-radius:var(--radius);width:100%}
.split-img.two{display:grid;gap:14px}
.sub{color:var(--muted);font-weight:500;margin-top:-.2em}
.ticks{list-style:none;padding:0;margin:1em 0}
.ticks li{position:relative;padding:6px 0 6px 30px}
.ticks li::before{content:"";position:absolute;left:0;top:.8em;width:16px;height:16px;border-radius:50%;background:var(--accent)}
.ticks li::after{content:"";position:absolute;left:5px;top:calc(.8em + 3px);width:5px;height:8px;border:solid #2a1a00;border-width:0 2px 2px 0;transform:rotate(45deg)}
.ticks.cols{display:grid;grid-template-columns:1fr 1fr;gap:0 32px;margin-top:28px}
.link{font-weight:600;text-decoration:none}
.link:hover{text-decoration:underline}

.band{background:var(--navy);color:#fff;padding:52px 0}
.band h2{color:#fff;margin-bottom:.3em}
.band p{margin:0;opacity:.85}
.band-row{display:flex;align-items:center;justify-content:space-between;gap:28px}

/* tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
.spec{width:100%;border-collapse:collapse;min-width:640px;font-size:.95rem}
.spec th,.spec td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.spec thead th{background:var(--navy);color:#fff;font-weight:600;white-space:nowrap}
.spec tbody th{color:var(--navy-2);white-space:nowrap}
.spec tbody tr:last-child>*{border-bottom:0}
.spec .code{display:block;font-size:.72rem;font-weight:600;letter-spacing:.08em;color:var(--accent-ink)}

.defs{margin:1.2em 0 0}
.defs div{padding:14px 0;border-top:1px solid var(--line)}
.defs dt{font-weight:600;color:var(--navy-2)}
.defs dd{margin:2px 0 0;color:var(--muted);font-size:.95rem}

.tech-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.tech{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.tech .num{font-size:.8rem;font-weight:700;color:var(--accent-ink);letter-spacing:.08em}
.tech h3{margin:.4em 0 .4em;font-size:1.02rem}
.tech p{font-size:.92rem;color:var(--muted);margin:0}

.timeline{list-style:none;margin:0;padding:0;border-left:2px solid var(--accent)}
.timeline li{position:relative;padding:0 0 22px 28px;display:flex;gap:18px}
.timeline li::before{content:"";position:absolute;left:-7px;top:.45em;width:12px;height:12px;border-radius:50%;background:var(--accent)}
.timeline b{min-width:48px;color:var(--navy-2)}
.timeline span{color:var(--muted)}

.benefit-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.benefit{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff}
.benefit p{color:var(--muted);font-size:.94rem;margin:0}
.steps{list-style:none;counter-reset:s;margin:1em 0 0;padding:0}
.steps li{counter-increment:s;position:relative;padding:0 0 18px 52px}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:36px;height:36px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:700}
.steps strong{display:block;color:var(--navy-2)}
.steps span{color:var(--muted);font-size:.95rem}

.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0 20px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:600;padding:16px 0;color:var(--navy-2)}
.faq details p{color:var(--muted);margin:0 0 16px}

/* form */
.form{display:grid;gap:16px}
.form label{display:grid;gap:6px;font-weight:500;font-size:.93rem}
.form input,.form select,.form textarea{font:inherit;padding:12px 14px;border:1px solid #c8d0d9;border-radius:10px;background:#fff;color:var(--ink);width:100%}
.form input:focus,.form select:focus,.form textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.form input:invalid:not(:placeholder-shown):not(:focus){border-color:#c0392b}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.hp{position:absolute;left:-9999px}
.form .btn{justify-self:start}
.form-msg{margin:0;font-size:.95rem;min-height:1.4em}
.form-msg.ok{color:#17623a}
.form-msg.err{color:#a8321f}

.contact-list{list-style:none;padding:0;margin:0 0 1em}
.contact-list li{display:flex;gap:16px;padding:12px 0;border-top:1px solid var(--line)}
.contact-list span{min-width:80px;color:var(--muted)}
.contact-list a{font-weight:600;text-decoration:none}

/* footer */
.site-foot{background:var(--navy-2);color:#cfd8e3;padding:56px 0 0;font-size:.93rem}
.site-foot a{color:#fff;text-decoration:none}
.site-foot a:hover{text-decoration:underline}
.site-foot h3{color:#fff;font-size:.95rem;margin-bottom:.8em}
.site-foot p{margin:0 0 .6em}
.foot-grid{display:grid;grid-template-columns:1.2fr 1fr 1.4fr .8fr;gap:32px;padding-bottom:36px}
.foot-brand .wm{color:#fff}
.foot-small{opacity:.7;font-size:.85rem}
.foot-base{border-top:1px solid rgba(255,255,255,.12);padding-top:18px;padding-bottom:22px;font-size:.82rem;opacity:.75}

/* thanh liên hệ nhanh trên điện thoại */
.dock{display:none}

@media (max-width:980px){
  .hero-grid,.split{grid-template-columns:1fr;gap:28px}
  .split.rev>:first-child{order:0}
  .hero-art img{aspect-ratio:16/11}
  .cards3{grid-template-columns:1fr 1fr}
  .tech-grid,.benefit-grid{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .trust-row{grid-template-columns:1fr 1fr}
  .trust-row div:nth-child(3){border-left:0}
  .band-row{flex-direction:column;align-items:flex-start}
}
@media (max-width:1000px){
  .nav-toggle{display:block}
  .nav{position:absolute;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:12px 20px 20px;display:none}
  .nav.open{display:flex}
  .nav a{padding:12px 14px}
  .nav .nav-cta{margin:8px 0 0;text-align:center}
}
@media (max-width:760px){
  .sec{padding:52px 0}
  .cards3,.tech-grid,.benefit-grid,.foot-grid,.grid2,.ticks.cols{grid-template-columns:1fr}
  .feat-grid{grid-template-columns:1fr 1fr;gap:14px}
  .feat figcaption{padding:12px 12px 16px}
  .feat span{font-size:.85rem}
  .dock{display:grid;grid-template-columns:1fr 1fr 1.6fr;position:fixed;left:0;right:0;bottom:0;z-index:60;background:#fff;border-top:1px solid var(--line);box-shadow:0 -6px 20px rgba(0,0,0,.08)}
  .dock a{padding:14px 8px;text-align:center;text-decoration:none;font-weight:600;color:var(--navy);font-size:.92rem}
  .dock .dock-main{background:var(--accent);color:#2a1a00}
  body{padding-bottom:52px}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}