/* Core Material JSC — www.corematerial.vn */
:root{--black:#111;--gold:#D4A835;--gold-d:#B8901F;--gold-l:#F2C94C;--gray:#6B6B6B;--paper:#F7F5F0;--paper-2:#EFECE4;--white:#fff;
  --ink:#111;--ink-2:#3d3d3d;--ink-3:#6B6B6B;--line:#E0DCD2;--line-d:#2a2a2a;--r:3px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Montserrat",system-ui,sans-serif;color:var(--ink);background:var(--paper);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
img,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 28px}
.tag{font-size:12px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--gold-d);display:inline-flex;align-items:center;gap:12px}
.tag::before{content:"";width:26px;height:2px;background:var(--gold)}
.dark .tag{color:var(--gold)}
h1,h2,h3,h4{line-height:1.18;letter-spacing:-.015em}
h2{font-size:clamp(26px,3.2vw,40px);font-weight:700;margin:14px 0 16px}
.lead{font-size:17px;color:var(--ink-2);max-width:760px}
section{padding:96px 0}
.dark{background:var(--black);color:#fff}.dark .lead,.dark p{color:#c4c4c4}
.alt{background:var(--white);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 24px;font-weight:600;font-size:14px;letter-spacing:.02em;border-radius:var(--r);transition:.2s;cursor:pointer;border:1.5px solid transparent;font-family:inherit;background:none}
.btn-gold{background:var(--gold);color:var(--black)}.btn-gold:hover{background:var(--gold-l)}
.btn-dark{background:var(--black);color:#fff}.btn-dark:hover{background:var(--gold);color:var(--black)}
.btn-line{border-color:currentColor}.btn-line:hover{background:var(--gold);border-color:var(--gold);color:var(--black)}
.btn svg{width:16px;height:16px}
.mk{display:block}

/* header */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px;gap:20px}
.logo{display:flex;align-items:center;gap:12px;color:var(--black);flex-shrink:0}
.logo .mk{width:34px;height:40px}
.wm{line-height:1}.wm b{font-weight:700;font-size:19px;letter-spacing:-.025em}.wm b span{font-weight:400}
.wm small{display:block;font-size:8.4px;letter-spacing:.24em;margin-top:5px;font-weight:500;color:var(--ink-2)}
.menu{display:flex;gap:26px;font-size:14px;font-weight:500;color:var(--ink-2)}
.menu a{position:relative;padding:4px 0;white-space:nowrap}
.menu a::after{content:"";position:absolute;left:0;bottom:-2px;height:2px;width:0;background:var(--gold);transition:width .25s}
.menu a:hover,.menu a.on{color:var(--black)}.menu a:hover::after,.menu a.on::after{width:100%}
.nav .btn{padding:10px 16px;font-size:13px}
.burger{display:none;background:none;border:0;cursor:pointer;padding:8px}
.burger span{display:block;width:22px;height:2px;background:var(--black);margin:5px 0}

/* hero */
.hero{background:var(--black);color:#fff;padding:80px 0 0;overflow:hidden}
.hero-in{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(38px,5.4vw,68px);font-weight:800;letter-spacing:-.03em;line-height:1.04;margin:22px 0 22px}
.hero h1 em{font-style:normal;color:var(--gold)}
.hero p.sub{font-size:17.5px;color:#c9c9c9;max-width:560px;margin-bottom:34px;font-weight:400}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}.hero .btn-line{color:#fff}
.hero-media{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;gap:12px;height:460px}
.hero-media figure{position:relative;overflow:hidden;border-radius:2px;background:#1c1c1c}
.hero-media figure:first-child{grid-row:span 2}
.hero-media img{width:100%;height:100%;object-fit:cover}
.hero-media figcaption{position:absolute;left:0;right:0;bottom:0;padding:22px 14px 10px;font-size:11.5px;letter-spacing:.14em;font-weight:600;text-transform:uppercase;background:linear-gradient(transparent,rgba(0,0,0,.75))}
.hero-media figcaption b{color:var(--gold)}
.values{display:flex;justify-content:center;align-items:center;gap:clamp(14px,4vw,52px);flex-wrap:wrap;border-top:1px solid var(--line-d);margin-top:72px;padding:24px 0;font-size:13px;letter-spacing:.3em;color:#e8e8e8}
.values i{width:6px;height:6px;border-radius:50%;background:var(--gold);display:inline-block}

/* page head */
.phead{background:var(--black);color:#fff;padding:64px 0 56px}
.crumb{font-size:12.5px;color:#9a9a9a;margin-bottom:18px}.crumb a{color:var(--gold)}
.phead h1{font-size:clamp(32px,4.4vw,52px);font-weight:800;letter-spacing:-.025em;margin:14px 0 14px}
.phead p{color:#c4c4c4;font-size:17px;max-width:780px}

/* two business lines */
.lines{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:44px}
.line-card{position:relative;border-radius:var(--r);overflow:hidden;min-height:400px;display:flex;flex-direction:column;justify-content:flex-end;color:#fff;background:#151515}
.line-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55;transition:transform .6s,opacity .3s}
.line-card:hover img{transform:scale(1.04);opacity:.42}
.line-card .tx{position:relative;padding:34px;background:linear-gradient(transparent,rgba(0,0,0,.85) 40%)}
.line-card .k{font-size:11.5px;letter-spacing:.2em;font-weight:700;color:var(--gold)}
.line-card h3{font-size:28px;margin:8px 0 10px}
.line-card p{color:#d0d0d0;font-size:15px;margin-bottom:16px;max-width:460px}
.line-card ul{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.line-card li{font-size:12.5px;border:1px solid rgba(255,255,255,.3);padding:4px 10px;border-radius:30px}
.more{font-weight:600;font-size:14px;color:var(--gold);display:inline-flex;gap:8px;align-items:center}
.more svg{width:16px;height:16px;flex-shrink:0}

/* cards grid */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid.g4{grid-template-columns:repeat(4,1fr)}.grid.g2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
a.card:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(0,0,0,.08)}
.card .ph{aspect-ratio:4/3;background:#1a1a1a center/cover no-repeat;position:relative}
.card .ph.hex{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#151515,#2b2b2b)}
.card .ph.hex svg{width:72px;height:84px;opacity:.9}
.card .tx{padding:22px 22px 24px;display:flex;flex-direction:column;flex:1}
.card .k{font-size:11px;letter-spacing:.16em;font-weight:700;text-transform:uppercase;color:var(--gold-d)}
.card h3{font-size:19px;margin:8px 0 8px}
.card p{font-size:14.5px;color:var(--ink-2);flex:1}
.card .more{margin-top:14px;color:var(--gold-d)}
.pledge{display:inline-block;margin-top:12px;font-size:11px;letter-spacing:.16em;font-weight:700;color:var(--black);background:#f5ecd2;padding:5px 9px;border-radius:2px}

/* product detail block */
.pblock{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:start;padding:72px 0;border-bottom:1px solid var(--line)}
.pblock:last-child{border-bottom:0}
.pblock.rev .pmedia{order:2}
.pmedia img{width:100%;border-radius:var(--r)}
.pmedia .thumbs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:8px}
.pmedia .thumbs img{aspect-ratio:1/1;object-fit:cover}
.pblock h2{font-size:clamp(26px,3vw,36px);margin:10px 0 12px}
.pblock .pl{display:flex;gap:10px;flex-wrap:wrap;margin:6px 0 18px}
.pblock .pl span{font-size:12px;font-weight:700;letter-spacing:.16em;background:var(--black);color:var(--gold);padding:6px 11px;border-radius:2px}
.pblock .pl span small{display:block;font-size:10.5px;letter-spacing:.04em;color:#ddd;font-weight:500;margin-top:2px}
.pblock p{color:var(--ink-2);margin-bottom:14px}
.pblock ul.chk{list-style:none;margin:6px 0 20px}
.pblock ul.chk li{padding:7px 0 7px 26px;position:relative;border-bottom:1px dashed var(--line);font-size:15px}
.pblock ul.chk li::before{content:"";position:absolute;left:2px;top:15px;width:10px;height:11px;background:var(--gold);clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%)}
table.spec{width:100%;border-collapse:collapse;background:#fff;font-size:14.5px;margin:10px 0 20px}
table.spec th,table.spec td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
table.spec th{background:var(--black);color:var(--gold);font-weight:600;width:38%}
table.spec td.tbd{color:var(--ink-3);font-style:italic}
.grades{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:16px 0 22px}
.grades figure{background:#fff;border:1px solid var(--line);border-radius:2px;overflow:hidden}
.grades img{aspect-ratio:1/1;object-fit:cover;width:100%}
.grades figcaption{padding:8px 10px;font-size:12.5px}.grades b{display:block;font-size:13.5px}
.note{font-size:14px;background:#fff;border:1px solid var(--line);border-left:4px solid var(--gold);padding:14px 18px;margin:16px 0;border-radius:2px;color:var(--ink-2)}
.chips{display:flex;flex-wrap:wrap;gap:8px}.chips a{font-size:13px;border:1px solid var(--line);padding:6px 12px;border-radius:30px;background:#fff}.chips a:hover{border-color:var(--gold)}

/* placeholder (chỉ bản xem trước) */
.ph-box{border:2px dashed #c9b37a;background:repeating-linear-gradient(45deg,#faf6ea,#faf6ea 10px,#f4ecd4 10px,#f4ecd4 20px);color:#7a6420;font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center;text-align:center;padding:20px;border-radius:var(--r);min-height:180px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:40px;border:1px solid var(--line-d)}
.step{padding:30px 26px;border-right:1px solid var(--line-d)}.step:last-child{border-right:0}
.step .n{width:48px;height:54px;display:grid;place-items:center;font-weight:800;color:var(--black);background:var(--gold);clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%);margin-bottom:16px}
.step h4{font-size:16.5px;margin-bottom:8px;color:#fff}.step p{font-size:14px}
.scope{margin-top:22px;font-size:13.5px;color:#9a9a9a;font-style:italic}
.alt .steps,.paper .steps{border-color:var(--line)}.alt .step,.paper .step{border-color:var(--line)}.alt .step h4,.paper .step h4{color:var(--ink)}

/* video */
.vgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:40px}
.vcard{background:#1a1a1a;border-radius:var(--r);overflow:hidden;color:#fff}
.vcard video{width:100%;aspect-ratio:9/12;object-fit:cover;background:#000}
.vcard .tx{padding:16px 18px}.vcard h4{font-size:16px;margin-bottom:4px}.vcard p{font-size:13px;color:#aaa}
.alt .vcard,.paper .vcard{background:#fff;color:var(--ink);border:1px solid var(--line)}.alt .vcard p{color:var(--ink-3)}

/* values block */
.cv-grid{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);background:#fff;margin-top:40px}
.cv-item{padding:36px 32px;border-right:1px solid var(--line)}.cv-item:last-child{border-right:0}
.cv-item .en{font-size:13px;letter-spacing:.28em;font-weight:700;color:var(--gold-d)}
.cv-item h3{font-size:22px;margin:8px 0 10px}.cv-item p{font-size:14.5px;color:var(--ink-2)}

/* gallery small */
.gal{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.gal figure{position:relative;overflow:hidden;border-radius:2px;aspect-ratio:1/1;background:#222}
.gal img{width:100%;height:100%;object-fit:cover}
.gal figcaption{position:absolute;left:0;right:0;bottom:0;padding:18px 10px 8px;font-size:11.5px;color:#fff;background:linear-gradient(transparent,rgba(0,0,0,.7))}

/* contact */
.contact-in{display:grid;grid-template-columns:1fr 1.2fr;gap:64px}
.info{margin-top:30px;border-top:1px solid var(--line)}
.info div{display:grid;grid-template-columns:46px 1fr;gap:12px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line);font-size:15px}
.info .ic{width:38px;height:38px;border-radius:50%;background:var(--black);display:grid;place-items:center}
.info .ic svg{width:17px;height:17px;color:var(--gold)}
.info small{display:block;font-size:11px;font-weight:600;letter-spacing:.14em;color:var(--ink-3);text-transform:uppercase}
form.lead-form{background:#fff;border:1px solid var(--line);border-top:3px solid var(--gold);padding:34px;border-radius:var(--r)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
label{display:block;font-size:12.5px;font-weight:600;margin-bottom:6px;color:var(--ink-2)}
.f{margin-bottom:16px}
input,select,textarea{width:100%;font:inherit;font-size:14.5px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper);color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--gold);background:#fff}
textarea{min-height:110px;resize:vertical}
fieldset{border:0;margin:0 0 16px}
legend{font-size:12.5px;font-weight:600;color:var(--ink-2);margin-bottom:8px}
.opts{display:flex;flex-wrap:wrap;gap:8px}
.opts label{margin:0;font-weight:500;font-size:13px;padding:7px 13px;border:1px solid var(--line);border-radius:30px;cursor:pointer;background:var(--paper)}
.opts input{position:absolute;opacity:0;width:1px;height:1px}
.opts label:has(input:checked){background:var(--black);border-color:var(--black);color:var(--gold)}
.opts label:has(input:focus-visible){outline:2px solid var(--gold)}
.grp-t{font-size:11px;letter-spacing:.14em;font-weight:700;color:var(--ink-3);margin:10px 0 6px;text-transform:uppercase;width:100%}
.cond{display:none}.cond.show{display:block}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.status{display:none;margin-top:16px;padding:14px 16px;border-radius:var(--r);font-size:14.5px}
.status.ok{display:block;background:#eaf6ee;border:1px solid #b9dcc9}
.status.err{display:block;background:#fdf1e6;border:1px solid #f0cfa8}
.status.busy{display:block;background:#f4f4f4;border:1px solid #ddd}
.req{color:#b23}

/* cta */
.cta{background:var(--black);color:#fff;border-radius:var(--r);padding:40px;display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap}
.cta h2{font-size:26px;margin:0}.cta p{color:#bbb;font-size:15px;margin-top:6px}

footer{background:var(--black);color:#a8a8a8;padding:60px 0 28px;font-size:14px}
.foot{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px}
.foot h6{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);margin-bottom:14px;font-weight:600}
.foot li{list-style:none;padding:3px 0}.foot a:hover{color:var(--gold)}
.foot .logo{color:#fff;margin-bottom:16px}.foot .wm small{color:#cfcfcf}
.copy{border-top:1px solid #2a2a2a;margin-top:40px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:12.5px}
.copy .v{letter-spacing:.22em}
.float-call{display:none}

@media(max-width:1060px){.menu{gap:18px;font-size:13px}.nav .btn{display:none}}
@media(max-width:980px){
  .menu{display:none;position:absolute;top:76px;left:0;right:0;flex-direction:column;background:#fff;padding:18px 28px;gap:14px;border-bottom:1px solid var(--line);font-size:15px}
  .menu.open{display:flex}.burger{display:block}
  .hero-in,.contact-in,.lines,.pblock{grid-template-columns:1fr}
  .pblock.rev .pmedia{order:0}
  .hero-media{height:380px}
  .grid,.grid.g4,.cv-grid,.vgrid{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}.step{border-bottom:1px solid var(--line-d)}
  .cv-item{border-right:0;border-bottom:1px solid var(--line)}
  .foot{grid-template-columns:1fr 1fr}.gal{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:620px){
  section{padding:68px 0}.wrap{padding:0 20px}
  .hero{padding-top:52px}.hero-media{height:300px;gap:8px}
  .values{font-size:11px;letter-spacing:.18em;margin-top:52px}
  .grid,.grid.g4,.grid.g2,.cv-grid,.vgrid,.steps,.row{grid-template-columns:1fr}
  .grades{grid-template-columns:repeat(2,1fr)}.gal{grid-template-columns:repeat(2,1fr)}
  .line-card{min-height:340px}.line-card .tx{padding:24px}
  form.lead-form{padding:22px}.foot{grid-template-columns:1fr}
  .float-call{display:flex;position:fixed;right:16px;bottom:16px;z-index:60;background:var(--gold);color:var(--black);font-weight:700;font-size:14px;padding:12px 16px;border-radius:30px;box-shadow:0 6px 20px rgba(0,0,0,.25);gap:8px;align-items:center}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
.nav .lang{font-size:12px;font-weight:700;letter-spacing:.08em;padding:6px 9px;border:1px solid var(--line,#ddd);border-radius:3px;color:inherit;text-decoration:none;margin-left:8px}
.nav .lang:hover{border-color:#D4A835;color:#D4A835}