:root{
  --ink:#0e0f10; --ink2:#17191b; --stone:#2a2d30; --gray:#6b7075; --line:#d9dbdd;
  --mist:#f2f3f4; --white:#fff; --radius:6px; --max:1180px;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--white);line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;display:block}
a{color:inherit}
.wrap{width:min(100% - 40px,var(--max));margin-inline:auto}
.skip{position:absolute;left:-999px;top:8px;background:#fff;color:#000;padding:8px 12px;z-index:100}
.skip:focus{left:8px}

/* buttons */
.btn{display:inline-block;font:600 .95rem/1 var(--font);padding:14px 24px;border-radius:var(--radius);border:1px solid transparent;text-decoration:none;cursor:pointer;transition:.2s}
.btn-light{background:#fff;color:var(--ink)} .btn-light:hover{background:var(--line)}
.btn-dark{background:var(--ink);color:#fff} .btn-dark:hover{background:var(--stone)}
.btn-ghost{border-color:rgba(255,255,255,.6);color:#fff} .btn-ghost:hover{background:rgba(255,255,255,.12)}
:focus-visible{outline:2px solid #9fb3c8;outline-offset:2px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(14,15,16,.92);backdrop-filter:blur(8px);color:#fff;border-bottom:1px solid rgba(255,255,255,.08)}
.header-in{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo-mark{width:34px;height:34px}
.logo-text{display:flex;flex-direction:column;line-height:1.05}
.logo-text strong{font-size:1.05rem;letter-spacing:.14em}
.logo-text em{font-style:normal;font-size:.72rem;letter-spacing:.5em;color:#aeb3b8}
.nav{display:flex;align-items:center;gap:26px}
.nav a{text-decoration:none;font-size:.92rem;color:#d6d9dc}
.nav a:hover{color:#fff}
.nav .nav-cta{padding:11px 18px;color:var(--ink)}
.nav-toggle{display:none;background:none;border:0;width:44px;height:44px;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:#fff;margin:5px auto;transition:.2s}

/* hero */
.hero{position:relative;color:#fff;background:var(--ink);overflow:hidden}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(1200px 500px at 80% -10%,rgba(255,255,255,.08),transparent 60%),
  linear-gradient(160deg,#1b1d1f 0%,#0b0c0d 60%);}
.hero-bg::after{content:"";position:absolute;inset:0;opacity:.35;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .5 0'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='.35'/></svg>")}
.hero-in{position:relative;padding:clamp(90px,16vw,180px) 0 clamp(80px,13vw,150px);max-width:880px;margin-left:max(20px,calc((100% - var(--max))/2))}
.eyebrow{margin:0 0 14px;font-size:.78rem;letter-spacing:.22em;text-transform:uppercase;color:var(--gray)}
.hero .eyebrow,.dark .eyebrow{color:#9aa0a6}
.hero h1{margin:0 0 22px;font-size:clamp(2rem,5.2vw,3.8rem);line-height:1.1;font-weight:700;letter-spacing:-.01em}
.lead{font-size:clamp(1rem,1.6vw,1.2rem);color:#c9cdd1;max-width:640px;margin:0 0 34px}
.actions{display:flex;flex-wrap:wrap;gap:14px}

/* sections */
.section{padding:clamp(64px,9vw,120px) 0}
.section.dark{background:var(--ink);color:#fff}
.section.alt{background:var(--mist)}
.sec-head{max-width:700px;margin-bottom:44px}
.sec-head h2,.section h2{margin:0 0 14px;font-size:clamp(1.6rem,3.2vw,2.5rem);line-height:1.2;letter-spacing:-.01em}
.sec-head p{margin:0;color:var(--gray)}
.note{font-size:.88rem;color:var(--gray);border-left:2px solid var(--line);padding-left:12px;margin-top:22px}
.dark .note{color:#9aa0a6;border-color:#3a3d40}

/* products */
.grid{display:grid;gap:22px}
.products{grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:.25s}
.card:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(0,0,0,.12)}
.card .ph{aspect-ratio:4/3}
.card-body{padding:22px;display:flex;flex-direction:column;gap:10px;flex:1}
.card-body h3{margin:0;font-size:1.2rem}
.card-body p{margin:0 0 8px;color:var(--gray);font-size:.95rem;flex:1}
.card-body .btn{align-self:flex-start;padding:12px 20px}

/* image placeholders (không giả làm ảnh thực) */
.ph{position:relative;display:grid;place-items:end start;background-color:#2b2e31;overflow:hidden}
.ph span{position:relative;z-index:1;margin:12px;padding:4px 10px;font-size:.72rem;letter-spacing:.04em;color:#e6e8ea;background:rgba(0,0,0,.55);border-radius:3px}
.ph::before{content:"";position:absolute;inset:0}
.tex-kho::before{background:radial-gradient(circle at 30% 30%,#4a4d50,#222426 70%),url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='1.1' numOctaves='3'/><feColorMatrix values='0 0 0 0 .6 0 0 0 0 .6 0 0 0 0 .6 0 0 0 .7 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");background-blend-mode:overlay}
.tex-bam::before{background:repeating-linear-gradient(115deg,#26292b 0 6px,#3b3f42 6px 9px,#202224 9px 15px)}
.tex-hone::before{background:linear-gradient(135deg,#3a3d40,#2a2d2f 55%,#34373a)}
.tex-bong::before{background:linear-gradient(125deg,#0d0e0f 0%,#2e3236 38%,#0f1011 52%,#23272a 100%)}
.tex-tay::before{background:radial-gradient(circle at 70% 20%,#6a6d6f,#46494b 45%,#2f3234 100%)}
.tex-factory{aspect-ratio:4/3;border-radius:var(--radius)}
.tex-factory::before{background:linear-gradient(160deg,#25282a,#141517)}

/* factory */
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:clamp(30px,6vw,80px);align-items:center}
.split p{color:#c4c8cc}
.ticks{list-style:none;padding:0;margin:22px 0}
.ticks li{padding:10px 0 10px 28px;position:relative;border-bottom:1px solid #26292b}
.ticks li::before{content:"";position:absolute;left:2px;top:19px;width:12px;height:6px;border-left:2px solid #fff;border-bottom:2px solid #fff;transform:rotate(-45deg)}

/* applications */
.apps{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.app{padding:26px 22px;border-top:2px solid var(--ink);background:var(--mist)}
.app b{font-size:.8rem;color:var(--gray);letter-spacing:.1em}
.app h3{margin:6px 0 8px;font-size:1.1rem}
.app p{margin:0;color:var(--gray);font-size:.93rem}

/* steps */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:18px;counter-reset:s}
.steps li{counter-increment:s;background:#fff;padding:24px 20px;border-radius:var(--radius);border:1px solid var(--line)}
.steps li::before{content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--ink);color:#fff;font-weight:700;margin-bottom:14px}
.steps h3{margin:0 0 8px;font-size:1rem}
.steps p{margin:0;font-size:.9rem;color:var(--gray)}

/* catalogue */
.cat{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;border:1px solid var(--line);border-radius:var(--radius);padding:clamp(26px,5vw,48px)}
.cat p{margin:0;color:var(--gray);max-width:560px}

/* contact */
.contact{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(30px,6vw,80px)}
.contact-info p{color:#c4c8cc}
.contact-info dl{margin:28px 0 0;display:grid;grid-template-columns:auto 1fr;gap:10px 18px;font-size:.95rem}
.contact-info dt{color:#8b9096}
.contact-info dd{margin:0}
.form{display:grid;gap:16px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
label{display:grid;gap:6px;font-size:.85rem;color:#c4c8cc}
input,select{font:inherit;padding:13px 14px;background:#17191b;color:#fff;border:1px solid #34373a;border-radius:var(--radius);width:100%;min-height:46px}
input::placeholder{color:#6d7277}
input:focus,select:focus{outline:2px solid #9fb3c8;border-color:transparent}
input[type=file]{padding:10px}
input.err,select.err{border-color:#e07a7a}
.form .btn{justify-self:start}
.form-msg{margin:0;font-size:.92rem;color:#c4c8cc;white-space:pre-wrap}
.form-msg .copy{margin-top:10px}

/* footer */
.site-footer{background:#08090a;color:#8b9096;font-size:.85rem;padding:24px 0}
.foot-in{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.site-footer a{color:#c4c8cc}

/* dialog */
dialog{border:0;padding:0;border-radius:8px;width:min(92vw,720px);max-height:90vh;overflow:auto}
dialog::backdrop{background:rgba(0,0,0,.7)}
dialog .x{position:absolute;right:10px;top:8px;z-index:3;width:40px;height:40px;border:0;border-radius:50%;background:rgba(0,0,0,.6);color:#fff;font-size:1.5rem;cursor:pointer}
.d-img{aspect-ratio:16/9}
.d-body{padding:26px}
.d-body h3{margin:0 0 10px;font-size:1.5rem}
.d-body p{color:#3b3f43}
.d-body .note{margin:18px 0}

/* responsive */
@media (max-width:960px){
  .steps{grid-template-columns:1fr 1fr}
  .split,.contact{grid-template-columns:1fr}
}
@media (max-width:820px){
  .nav-toggle{display:block}
  .nav{position:absolute;top:68px;left:0;right:0;background:var(--ink);flex-direction:column;align-items:stretch;gap:0;padding:8px 20px 20px;border-bottom:1px solid #26292b;display:none}
  .nav.open{display:flex}
  .nav a{padding:14px 0;border-bottom:1px solid #1f2123}
  .nav .nav-cta{margin-top:14px;text-align:center;border:0}
  .nav-toggle[aria-expanded=true] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle[aria-expanded=true] span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded=true] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
}
@media (max-width:600px){
  .row,.steps{grid-template-columns:1fr}
  .hero-in{margin-left:20px;margin-right:20px}
  .btn{width:auto}
  .actions .btn{flex:1 1 100%;text-align:center}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* ảnh thật thay khung chờ */
.ph img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1}
.ph.has-img span{display:none}

/* trang sản phẩm */
.pd .ph{aspect-ratio:4/3;border-radius:var(--radius)}
.pd h1{margin:0 0 14px;font-size:clamp(1.8rem,3.6vw,2.8rem);line-height:1.15}
.pd p{color:#3b3f43}
.pd .eyebrow a{text-decoration:none}
.pd .actions{margin-top:24px}
.btn-outline{border-color:var(--ink);color:var(--ink)} .btn-outline:hover{background:var(--mist)}
.chips{display:flex;flex-wrap:wrap;gap:12px}
.card-link{font-size:.9rem;color:var(--gray);align-self:flex-start}

/* thư viện hình ảnh */
.g-tabs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}
.g-tab{font:600 .9rem var(--font);padding:10px 18px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--ink);cursor:pointer}
.g-tab.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.g-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr));gap:14px}
.g-item{padding:0;border:0;background:#2b2e31;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;cursor:zoom-in}
.g-item[hidden]{display:none}
.g-item img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.g-item:hover img{transform:scale(1.04)}
#lightbox{width:min(96vw,1100px);background:#000}
#lightbox img{width:100%;max-height:88vh;object-fit:contain}

/* ảnh ứng dụng */
.app{padding:0 0 22px}
.app>*:not(.app-img){margin-left:22px;margin-right:22px}
.app-img{width:100%;aspect-ratio:4/3;object-fit:cover;background:#2b2e31;margin-bottom:16px}

.g-more{display:block;margin:24px auto 0}
.g-more[hidden]{display:none}