/* ATS Vietnam – giao diện "Châu Âu": trắng, tối giản, chính xác (tham chiếu phong cách hãng kỹ thuật Đức/Thuỵ Sĩ).
   Than chì + cam ATS dùng tiết chế. Không dùng xanh navy (tránh giống Nido). */
:root{
  --surface:#ffffff; --on-accent:#1c1d1f; --header-bg:rgba(250,249,246,.97); --grid:rgba(36,39,43,.05);
  --ink:#1c1d1f; --graphite:#2a2c2f; --muted:#62666c; --muted-l:#8b9097;
  --line:#e3e2de; --line-2:#cfcdc8; --bg:#ffffff; --stone:#f5f4f1; --stone-2:#ecebe7;
  --accent:#e8702f; --accent-d:#c95a1d; --accent-l:#fdf1ea; --ok:#2f7d4a;
  --head:"Inter Tight","Inter",system-ui,sans-serif; --body:"Inter",system-ui,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16.5px/1.7 var(--body);-webkit-font-smoothing:antialiased;letter-spacing:-.005em}
img{max-width:100%;display:block}
a{color:var(--ink);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:var(--line-2)}
a:hover{color:var(--accent-d);text-decoration-color:var(--accent)}
h1,h2,h3,h4{font-family:var(--head);color:var(--ink);line-height:1.12;margin:0 0 .55em;font-weight:600;letter-spacing:-.02em}
h1{font-size:clamp(34px,4.8vw,58px);font-weight:600}
h2{font-size:clamp(26px,3.2vw,40px)}
h3{font-size:20px;letter-spacing:-.01em}
p{margin:0 0 1em}
.container{max-width:1240px;margin:0 auto;padding:0 16px}
.section{padding:104px 0}
.section.soft{background:var(--stone)}
.section.dark{background:var(--graphite);color:#d7d8da}
.section.dark h2,.section.dark h3{color:#fff}
.eyebrow{display:block;font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.eyebrow::before{content:"";display:inline-block;width:8px;height:8px;background:var(--accent);margin-right:10px;vertical-align:1px}
.lead{font-size:19px;line-height:1.65;color:var(--muted);max-width:760px}
.center{text-align:center}.center .lead{margin-left:auto;margin-right:auto}
.small{font-size:14px;color:var(--muted)}
.hazard{display:none}

/* Header – trắng, đường kẻ mảnh */
.topbar{background:var(--stone);color:var(--muted);font-size:13px;border-bottom:1px solid var(--line)}
.topbar .container{display:flex;gap:24px;justify-content:flex-end;padding-top:7px;padding-bottom:7px;flex-wrap:wrap}
.topbar a{color:var(--ink);text-decoration:none}
header.site{position:sticky;top:0;z-index:50;background:var(--header-bg);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
header.site .container{display:flex;align-items:center;gap:24px;height:78px}
.brand img{height:44px;width:auto}
nav.main{display:flex;gap:6px;margin-left:auto;align-items:center}
nav.main a{padding:8px 12px;color:var(--ink);font-weight:500;font-size:15px;text-decoration:none;position:relative}
nav.main a::after{content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;background:var(--accent);transform:scaleX(0);transition:transform .2s;transform-origin:left}
nav.main a:hover::after,nav.main a.active::after{transform:scaleX(1)}
.cart-link{display:inline-flex !important;align-items:center;gap:6px}
.cart-link::after{display:none}
.cart-link svg{stroke:var(--ink)}
.cart-count{background:var(--ink);color:var(--bg);border-radius:10px;font-size:12px;padding:0 7px;font-weight:600;min-width:20px;text-align:center}
.lang{font-size:13px !important;border:1px solid var(--line-2);margin-left:8px}
.lang::after{display:none}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line-2);padding:8px 12px;font:500 15px var(--body);cursor:pointer}
@media(max-width:1000px){
  .menu-btn{display:block}
  nav.main{display:none;position:absolute;top:78px;left:0;right:0;background:var(--surface);flex-direction:column;align-items:stretch;padding:8px 16px 18px;border-bottom:1px solid var(--line)}
  nav.main.open{display:flex}
  nav.main a{padding:13px 4px;border-bottom:1px solid var(--line)}
  nav.main a::after{display:none}
}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 24px;font:500 15.5px var(--body);border:1px solid transparent;cursor:pointer;transition:.15s;text-decoration:none;border-radius:2px}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:var(--accent);color:#fff}
.btn-primary::after{content:"→";transition:transform .15s}
.btn-primary:hover::after{transform:translateX(3px)}
.btn-outline{border-color:var(--line-2);color:var(--ink);background:var(--surface)}
.btn-outline:hover{border-color:var(--ink);color:var(--ink)}
.btn-light{background:#fff;color:#1c1d1f}
.btn-light:hover{background:var(--accent);color:#fff}
.btn-sm{padding:9px 14px;font-size:14px}
.btn-sm::after{content:none}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:32px}

/* Hero – trắng, nhiều khoảng thở */
.hero{padding:96px 0 88px;background:var(--bg);border-bottom:1px solid var(--line)}
.hero .container{display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:center}
.hero h1 span{color:var(--accent-d)}
.hero-visual{background:var(--stone);padding:28px;border:1px solid var(--line)}
@media(max-width:900px){.hero .container{grid-template-columns:1fr}.hero-visual{display:none}}
.stats{display:grid;grid-template-columns:repeat(3,1fr);margin-top:56px;border-top:1px solid var(--line);max-width:620px}
.stats div{padding:20px 20px 0 0}
.stats div+div{padding-left:20px;border-left:1px solid var(--line)}
.stats b{display:block;font:600 40px/1 var(--head);color:var(--ink);letter-spacing:-.03em}
.stats span{font-size:13.5px;color:var(--muted)}

/* Chain */
.chain{display:grid;grid-template-columns:repeat(5,1fr);margin-top:56px;border-top:1px solid var(--ink)}
.chain .step{text-align:left;padding:24px 24px 8px 0;position:relative;counter-increment:step}
.chain{counter-reset:step}
.chain .step::before{content:"0" counter(step);display:block;font:500 13px var(--body);color:var(--accent-d);margin-bottom:14px;letter-spacing:.06em}
.chain .step .dot{width:40px;height:40px;display:grid;place-items:center;margin-bottom:14px}
.chain .step .dot svg{width:30px;height:30px;stroke:var(--ink)}
.chain .step b{display:block;font:600 18px var(--head)}
.chain .step span{font-size:14px;color:var(--muted)}
@media(max-width:860px){.chain{grid-template-columns:1fr 1fr}}

/* Grid & cards – mảnh, phẳng */
.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:980px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);padding:32px;transition:.2s;display:flex;flex-direction:column}
a.card{color:inherit;text-decoration:none}
a.card:hover{border-color:var(--ink)}
.card .ic{width:44px;height:44px;display:grid;place-items:center;margin-bottom:22px;border:1px solid var(--line-2)}
.card .ic svg{width:24px;height:24px;stroke:var(--accent-d)}
.card ul{padding-left:18px;margin:6px 0 0;font-size:15.5px}
.card ul li{margin:5px 0}
.card .more{margin-top:auto;padding-top:16px;font-weight:500;font-size:14.5px;color:var(--ink)}
a.card:hover .more{color:var(--accent-d)}
.num{display:block;font:500 14px var(--body);color:var(--accent-d);letter-spacing:.08em;margin-bottom:10px}
.num::before{content:"— "}

/* Case */
.case{display:grid;grid-template-columns:1fr 1fr 1fr;border-top:1px solid var(--ink);margin-bottom:40px}
.case>div{padding:24px 24px 24px 0}
.case>div+div{padding-left:24px;border-left:1px solid var(--line)}
.case h4{font:600 12.5px var(--body);text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}
.case-head{grid-column:1/-1;padding:22px 0 !important;border-left:0 !important;border-bottom:1px solid var(--line)}
.case-head h3{margin:0 0 4px;font-size:24px}
.case-head span{font-size:14px;color:var(--muted)}
@media(max-width:760px){.case{grid-template-columns:1fr}.case>div+div{border-left:0;padding-left:0;border-top:1px solid var(--line)}}

.tag{display:inline-block;font-size:12.5px;font-weight:500;padding:3px 10px;border:1px solid var(--line-2);margin:0 6px 6px 0}
.law{background:var(--surface);padding:28px;border:1px solid var(--line)}
.law small{display:block;margin-top:10px;padding-top:12px;border-top:1px solid var(--line);color:var(--accent-d);font-weight:500}

/* SME block */
.sme{display:grid;grid-template-columns:1fr 1fr;gap:0;border-top:1px solid var(--ink);margin-top:40px}
.sme>div{padding:22px 24px 22px 0;border-bottom:1px solid var(--line)}
.sme>div:nth-child(even){padding-left:24px;border-left:1px solid var(--line)}
.sme b{display:block;font-family:var(--head);font-size:18px;margin-bottom:4px}
.sme span{color:var(--muted);font-size:15.5px}
.sme em{display:block;font-style:normal;color:var(--accent-d);font-size:15px;margin-top:6px}
@media(max-width:760px){.sme{grid-template-columns:1fr}.sme>div:nth-child(even){padding-left:0;border-left:0}}

/* Shop */
.shop{display:grid;grid-template-columns:240px 1fr;gap:40px;align-items:start}
@media(max-width:860px){.shop{grid-template-columns:1fr}}
.filters{position:sticky;top:100px;display:flex;flex-direction:column;border-top:1px solid var(--ink)}
@media(max-width:860px){.filters{position:static;flex-direction:row;flex-wrap:wrap;gap:6px;border-top:0}}
.filters button{text-align:left;background:none;border:0;border-bottom:1px solid var(--line);padding:12px 0;font:inherit;font-size:15px;cursor:pointer;color:var(--muted)}
@media(max-width:860px){.filters button{border:1px solid var(--line);padding:8px 12px}}
.filters button.active,.filters button:hover{color:var(--ink);font-weight:600}
.filters button.active::before{content:"";display:inline-block;width:8px;height:8px;background:var(--accent);margin-right:10px}
.product{background:var(--surface);border:1px solid var(--line);display:flex;flex-direction:column;transition:.2s}
.product:hover{border-color:var(--ink)}
.product .thumb{aspect-ratio:16/10;background:var(--stone);display:grid;place-items:center;text-decoration:none;border-bottom:1px solid var(--line)}
.product .thumb svg{width:56px;height:56px;stroke:var(--ink);stroke-width:1.3}
.product .body{padding:22px;display:flex;flex-direction:column;flex:1}
.product h3{font-size:18.5px;margin-bottom:8px}
.product h3 a{color:var(--ink);text-decoration:none}
.product h3 a:hover{color:var(--accent-d)}
.product p{font-size:15px;color:var(--muted);margin-bottom:12px}
.product .meta{font-size:13px;color:var(--muted-l);margin-bottom:16px}
.price{font:600 18px var(--head);color:var(--ink)}
.price.quote{color:var(--accent-d);font:500 14.5px var(--body)}
.product .foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
select,input,textarea{font:inherit;font-size:15.5px;padding:11px 12px;border:1px solid var(--line-2);border-radius:2px;width:100%;background:var(--surface);color:var(--ink)}
select:focus,input:focus,textarea:focus{outline:2px solid var(--ink);outline-offset:0}
label{font-size:13.5px;font-weight:600;color:var(--ink);display:block;margin-bottom:6px}
.field{margin-bottom:16px}
.pd{display:grid;grid-template-columns:1fr 1fr;gap:56px}
@media(max-width:860px){.pd{grid-template-columns:1fr}}
.pd .thumb{aspect-ratio:4/3;background:var(--stone);display:grid;place-items:center;border:1px solid var(--line)}
.pd .thumb svg{width:110px;height:110px;stroke:var(--ink);stroke-width:1.1}
.checklist{list-style:none;padding:0}
.checklist li{padding-left:26px;position:relative;margin:9px 0}
.checklist li::before{content:"";position:absolute;left:0;top:11px;width:12px;height:2px;background:var(--accent)}
.qty{display:inline-flex;border:1px solid var(--line-2)}
.qty button{background:var(--stone);border:0;width:38px;font-size:18px;cursor:pointer}
.qty input{width:56px;border:0;text-align:center;padding:8px 4px}
.cart-table{width:100%;border-collapse:collapse}
.cart-table th,.cart-table td{padding:16px 10px 16px 0;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
.cart-table th{font-size:12.5px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:600;border-bottom:1px solid var(--ink)}
.cart-wrap{display:grid;grid-template-columns:1.4fr 1fr;gap:48px;align-items:start}
@media(max-width:900px){.cart-wrap{grid-template-columns:1fr}.cart-table thead{display:none}.cart-table td{display:block;border:0;padding:4px 0}.cart-table tr{display:block;border-bottom:1px solid var(--line);padding:12px 0}}
.panel{background:var(--stone);padding:32px;border:1px solid var(--line)}
.notice{background:var(--stone);border-left:2px solid var(--accent);padding:14px 18px;font-size:14.5px;color:var(--ink)}
.success{background:#eef6f0;border-left:2px solid var(--ok);padding:18px;color:#14532d}
.remove{background:none;border:0;color:#a8321e;cursor:pointer;font:inherit;font-size:14px;text-decoration:underline}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(120px);background:var(--graphite);color:#fff;padding:12px 20px;transition:.25s;z-index:100;font-size:15px}
.toast.show{transform:translateX(-50%) translateY(0)}

.cta-band{background:var(--graphite);color:#fff;padding:56px;display:flex;gap:24px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.cta-band h2{color:#fff;margin:0 0 8px}
.cta-band p{color:#b9bcc0;margin:0}
.cta-band .btn-primary{background:var(--accent)}
.cta-band .btn-primary:hover{background:var(--surface);color:var(--ink)}
@media(max-width:600px){.cta-band{padding:30px}}

footer.site{background:#1a1b1d;color:#a2a6ab;font-size:14.5px;padding:72px 0 28px}
footer.site h4{color:#fff;font-size:14px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;margin-bottom:16px}
footer.site a{color:#e4e5e7;text-decoration:none}
footer.site a:hover{color:var(--accent)}
footer.site .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px}
@media(max-width:860px){footer.site .cols{grid-template-columns:1fr 1fr}}
@media(max-width:520px){footer.site .cols{grid-template-columns:1fr}}
footer.site ul{list-style:none;padding:0;margin:0}
footer.site li{margin:8px 0}
footer.site .legal{border-top:1px solid #303236;margin-top:44px;padding-top:20px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px}
.float-zalo{position:fixed;right:18px;bottom:18px;z-index:60;background:var(--ink);color:#fff;padding:12px 18px;font-weight:500;font-size:14.5px;text-decoration:none;box-shadow:0 8px 24px rgba(0,0,0,.18)}
.float-zalo:hover{background:var(--accent);color:#fff}
.page-head{padding:72px 0 48px;background:var(--bg);border-bottom:1px solid var(--line)}
.crumb{font-size:13.5px;color:var(--muted);margin-bottom:14px}
.crumb a{color:var(--muted);text-decoration:none}
.crumb a:hover{color:var(--ink)}

/* Thẻ nền tối */
.card-dark{background:var(--graphite);border-color:var(--graphite);color:#d7d8da}
.card-dark h3{color:#fff}
.card-dark li::marker{color:var(--accent)}

/* Ảnh sản phẩm phủ lên biểu tượng */
.product .thumb,.pd .thumb{position:relative;overflow:hidden}
.thumb img.photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;background:var(--surface)}

/* Ô ngành: ảnh nền mờ (assets/img/nganh/<slug>.jpg) + hình minh hoạ lớn mờ */
.card.ind{position:relative;overflow:hidden;min-height:230px;isolation:isolate}
.card.ind::after{content:"";position:absolute;inset:0;z-index:-1;background-image:var(--bg);background-size:cover;background-position:center;opacity:.13;filter:grayscale(1);transition:opacity .25s}
.card.ind:hover::after{opacity:.24}
.ind-ic{position:absolute;right:-14px;bottom:-14px;width:130px;height:130px;opacity:.09;z-index:-1;transition:opacity .25s}
.ind-ic svg{width:100%;height:100%;stroke-width:1.2}
.card.ind:hover .ind-ic{opacity:.18}
.ind-ic svg{stroke:var(--ink)}

/* Ô ảnh thực tế cỡ vừa (không tràn màn hình) */
.card.has-ph{padding-top:0;overflow:hidden}
.ph{position:relative;margin:0 -32px 24px;aspect-ratio:16/9;max-height:260px;background:var(--stone,#efede8);display:grid;place-items:center;align-content:center;gap:6px;border-bottom:1px solid var(--line)}
.ph span svg{width:44px;height:44px;stroke:var(--muted);opacity:.6}
.ph small{font-size:12px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}
.ph img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-visual{position:relative}
.hero-photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:2}

/* ===== v2 (09/11): bớt trắng + tối ưu chuyển đổi ===== */
:root{--bg:#faf9f6;--stone:#efede8;--stone-2:#e6e3dc;--line:#dedad2;--graphite:#24272b;--accent:#e8702f;--accent-d:#c95a1d}
body{background:var(--bg)}
/* Thanh trên cùng: than chì */
.topbar{background:var(--graphite);color:#b9bcc1;border-bottom:0}
.topbar a{color:#fff}
header.site{background:var(--header-bg)}
/* Nút chính: cam logo, chữ tối (tương phản ~6.5:1) */
.btn-primary{background:var(--accent);color:var(--on-accent);font-weight:600}
.btn-primary:hover{background:var(--accent-d);color:var(--on-accent)}
.btn-outline{background:transparent;border-color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:var(--bg)}
.cta-band .btn-primary{color:var(--on-accent)}
.side-box.dark .btn-primary{color:var(--on-accent)}
/* Hero: nền đá, ảnh có khung */
.hero{background:linear-gradient(180deg,var(--bg) 0%,var(--stone) 100%);border-bottom:0}
.hero-visual{background:var(--surface);border:1px solid var(--line);box-shadow:0 18px 40px rgba(36,39,43,.08)}
.stats{border-top-color:var(--line-2,#cfcac0)}
/* Khối xen kẽ: đá đậm hơn, thẻ trắng nổi lên */
.section.soft{background:var(--stone)}
.section.soft .card,.section.soft .law,.section.soft .product{border-color:var(--line);box-shadow:0 1px 0 rgba(36,39,43,.04)}
.card,.product,.law{background:var(--surface)}
a.card:hover,.product:hover{border-color:var(--ink);box-shadow:0 12px 28px rgba(36,39,43,.10)}
/* Đầu trang con: dải than chì */
.page-head{background:var(--graphite);color:#cfd2d6;border-bottom:3px solid var(--accent)}
.page-head h1,.page-head h2{color:#fff}
.page-head .lead,.page-head .small,.page-head p{color:#b9bcc1}
.page-head .crumb,.page-head .crumb a{color:#9ea3a9}
.page-head .crumb a:hover{color:#fff}
.page-head .stats{border-top-color:#3a3e44}
.page-head .stats b{color:#fff}.page-head .stats span{color:#9ea3a9}
.page-head .stats div+div{border-left-color:#3a3e44}
.page-head .btn-outline{color:#fff;border-color:#6b7077}
.page-head .btn-outline:hover{background:var(--surface);color:var(--ink)}
.page-head .svc-img{border-color:#3a3e44}
.page-head input{border-color:#4a4f56}
/* Chuỗi máy → ERP và bảng: nền trắng trên trang ấm */
.chain .step{background:transparent}
table.data{background:var(--surface)}
.filters{background:var(--surface)}
/* Nhãn và điểm nhấn nhỏ */
.eyebrow{color:var(--accent-d)}
.num{color:var(--accent-d)}
.float-zalo{background:var(--graphite)}

/* ===== v3 (09/11): logo lớn hơn, chi tiết bản vẽ kỹ thuật, chế độ tối ===== */
header.site .container{height:88px}
.brand img{height:60px}
@media(max-width:1000px){nav.main{top:88px}}
@media(max-width:600px){header.site .container{height:72px}.brand img{height:48px}nav.main{top:72px}}

/* Lưới bản vẽ mờ cho hero và khối xám */
.hero{background-color:var(--stone);background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px),linear-gradient(180deg,var(--bg),var(--stone));background-size:32px 32px,32px 32px,100% 100%}
.section.soft{background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:32px 32px}
.section{padding:88px 0}
.section+.section{border-top:1px solid var(--line)}
/* Tiêu đề nhỏ có đường dẫn */
.eyebrow{display:flex;align-items:center;gap:10px}
.eyebrow::after{content:"";flex:0 0 56px;height:1px;background:var(--line-2,#cfcdc8)}
.center .eyebrow{justify-content:center}
/* Góc khung kiểu bản vẽ trên thẻ */
.card,.product,.law{position:relative}
.card:not(.ind)::before,.product::before,.law::before{content:"";position:absolute;left:-1px;top:-1px;width:14px;height:14px;border-left:2px solid var(--accent);border-top:2px solid var(--accent);pointer-events:none}
.hero-visual{position:relative}
.hero-visual::after{content:"";position:absolute;right:-8px;bottom:-8px;width:40%;height:40%;border-right:2px solid var(--accent);border-bottom:2px solid var(--accent);pointer-events:none}

/* ===== Chế độ tối ===== */
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#16181b;--surface:#1f2226;--stone:#23272c;--stone-2:#2b3036;--line:#353a41;--line-2:#424850;
  --ink:#eceef0;--muted:#a6acb3;--muted-l:#8d939a;--graphite:#0f1113;--accent:#f0823f;--accent-d:#f59c66;--accent-l:#3a2618;
  --header-bg:rgba(22,24,27,.96);--grid:rgba(255,255,255,.035);--x-soft:#23272c;color-scheme:dark}
  :root:not([data-theme="light"]) .brand img{content:url("logo-dark.png")}}
:root[data-theme="dark"]{
  --bg:#16181b;--surface:#1f2226;--stone:#23272c;--stone-2:#2b3036;--line:#353a41;--line-2:#424850;
  --ink:#eceef0;--muted:#a6acb3;--muted-l:#8d939a;--graphite:#0f1113;--accent:#f0823f;--accent-d:#f59c66;--accent-l:#3a2618;
  --header-bg:rgba(22,24,27,.96);--grid:rgba(255,255,255,.035);--x-soft:#23272c;color-scheme:dark}
:root[data-theme="dark"] .brand img{content:url("logo-dark.png")}

/* ===== v4 (09/11): theo phong cách Grantek – trắng & xám lạnh, dải ảnh phủ tối, thẻ bóng mềm ===== */
:root{--bg:#ffffff;--stone:#f4f5f6;--stone-2:#eceef0;--line:#e3e5e8;--line-2:#d3d7dc;--muted:#5d636b;--header-bg:rgba(255,255,255,.97);--tint:#fff3ea;--photo-overlay:linear-gradient(90deg,rgba(16,20,26,.88) 0%,rgba(16,20,26,.72) 55%,rgba(16,20,26,.45) 100%)}
body{background:var(--bg)}
.topbar{background:#1b1f24}
/* Bỏ lưới & góc khung của v3 */
.section.soft{background-image:none}
.card:not(.ind)::before,.product::before,.law::before,.hero-visual::after{display:none}
.section+.section{border-top:0}
/* Hero: ảnh nhà máy toàn chiều ngang, phủ tối, chữ trắng */
.hero{position:relative;background:var(--photo-overlay),url("img/hero.jpg") center/cover no-repeat;color:#d9dde2;padding:110px 0 96px}
.hero h1{color:#fff}.hero h1 span{color:#ff9a5c}
.hero .lead{color:#c9ced5}
.hero .eyebrow{color:#ff9a5c}.hero .eyebrow::after{background:rgba(255,255,255,.3)}
.hero .container{grid-template-columns:1fr}
.hero .hero-visual{display:none}
.hero .btn-outline{color:#fff;border-color:rgba(255,255,255,.6)}
.hero .btn-outline:hover{background:#fff;color:#1c1d1f}
.hero .stats{border-top-color:rgba(255,255,255,.22);max-width:680px}
.hero .stats b{color:#fff}.hero .stats span{color:#b9bfc7}
.hero .stats div+div{border-left-color:rgba(255,255,255,.22)}
.hero .spec span{border-color:rgba(255,255,255,.28);color:#d9dde2}
.hero .spec span b{color:#ff9a5c}
/* Khối xen kẽ: xám lạnh; thẻ trắng không viền, bóng mềm */
.section.soft{background:var(--stone)}
.card,.product,.law,.side-box{border-color:transparent;box-shadow:0 4px 22px rgba(20,26,34,.07)}
.section .card,.section .product{border:1px solid transparent}
a.card:hover,.product:hover{border-color:transparent;box-shadow:0 14px 36px rgba(20,26,34,.14);transform:translateY(-2px)}
.card .ic{border:0;background:var(--tint)}
.chain{border-top:2px solid var(--accent)}
/* Dải nhấn nhạt (giống dải xanh nhạt của Grantek, đổi sang cam nhạt ATS) */
.section.soft:nth-of-type(3n){background:var(--tint)}
/* Đầu trang con và CTA: ảnh phủ tối */
.page-head{background:var(--photo-overlay),url("img/dv/dulieu.jpg") center/cover no-repeat;border-bottom:0;padding:84px 0 60px}
.cta-band{background:var(--photo-overlay),url("img/dv/dien.jpg") center/cover no-repeat;border-left:0}
.dark-sec{background:linear-gradient(rgba(16,20,26,.94),rgba(16,20,26,.94)),url("img/sp/tu-du-lieu-oee.jpg") center/cover no-repeat !important}
footer.site{background:#15181c}
@media(max-width:600px){.hero{padding:72px 0 60px}}
/* Chế độ tối v4 */
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg:#15181c;--stone:#1c2025;--stone-2:#23282e;--line:#2e343b;--line-2:#3b424a;--surface:#1f242a;--tint:#2a211b;--header-bg:rgba(21,24,28,.96)}}
:root[data-theme="dark"]{--bg:#15181c;--stone:#1c2025;--stone-2:#23282e;--line:#2e343b;--line-2:#3b424a;--surface:#1f242a;--tint:#2a211b;--header-bg:rgba(21,24,28,.96)}
/* Thẻ nền tối luôn thắng màu thẻ trắng */
.card.card-dark,.section .card.card-dark{background:#1f242a;color:#d7dbe0;border-color:transparent;box-shadow:0 14px 36px rgba(20,26,34,.18)}
.card.card-dark h3{color:#fff}
.card.card-dark li::marker{color:var(--accent)}
.card.card-dark .btn-primary{color:var(--on-accent)}