/* ==========================================================
   OTMVN.COM — STATIC SITE STYLESHEET (dùng chung mọi trang)
   Đổi màu/chữ toàn site: chỉ sửa khối :root bên dưới.
   ========================================================== */
:root{
  --deep:#04342C;        /* nền tối chính */
  --dark:#085041;        /* nền tối phụ / card trên nền tối */
  --primary:#0F6E56;     /* màu hành động */
  --mint:#5DCAA5;        /* màu nhấn sáng */
  --tint:#E1F5EE;        /* nền nhạt / chữ trên nền tối */
  --paper:#F6F8F6;       /* nền section xen kẽ */
  --white:#FFFFFF;
  --text:#17211E;
  --muted:#5A6763;
  --line:#E1E7E3;
  --line-dark:#0E5C4A;
  --sans:'IBM Plex Sans',system-ui,-apple-system,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
  --maxw:1140px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1 !important;transform:none !important;transition:none !important}
}
body{font-family:var(--sans);color:var(--text);background:var(--white);line-height:1.65;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.mono{font-family:var(--mono)}
h1,h2,h3{font-weight:600;line-height:1.25;letter-spacing:-.01em}
h2{font-size:clamp(24px,3.2vw,32px);margin-bottom:8px}
.lead{color:var(--muted);max-width:640px}
.sec{padding:76px 0}
.sec-paper{background:var(--paper)}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--primary);display:flex;align-items:center;gap:10px;margin-bottom:14px}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--mint)}

/* ---------- Nút ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:500;padding:13px 22px;border-radius:8px;transition:transform .15s ease,background .15s ease,border-color .15s ease;cursor:pointer;border:0;font-family:var(--sans)}
.btn:active{transform:scale(.98)}
.btn-solid{background:var(--mint);color:var(--deep)}
.btn-solid:hover{background:#74d6b4}
.btn-line{border:1px solid var(--line-dark);color:var(--tint)}
.btn-line:hover{background:rgba(93,202,165,.08)}
.btn-primary{background:var(--primary);color:var(--tint)}
.btn-primary:hover{background:#0c5b47}
.btn-ghost{border:1px solid var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}

/* ---------- Hiệu ứng hiện dần ---------- */
.rv{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.rv.in{opacity:1;transform:none}

/* ---------- Header ---------- */
header.site{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px}
.brand-logo{height:44px;width:auto;display:block}
@media (max-width:720px){.brand-logo{height:38px}}
.brand-mark{width:36px;height:36px;border-radius:8px;background:var(--deep);color:var(--mint);display:grid;place-items:center;font-family:var(--mono);font-weight:500;font-size:14px}
.brand-name{font-weight:600;font-size:16px;letter-spacing:.02em}
.brand-name span{display:block;font-family:var(--mono);font-weight:400;font-size:10.5px;color:var(--muted);letter-spacing:.08em}
.nav-links{display:flex;gap:26px;font-size:14.5px;color:var(--muted)}
.nav-links a:hover,.nav-links a.active{color:var(--primary)}
.nav-links a.active{font-weight:500}
.nav-cta{display:flex;align-items:center;gap:14px}
.lang-switch{font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.06em;color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:7px 11px;transition:.15s}
.lang-switch:hover{border-color:var(--primary);color:var(--primary)}
.nav-cta .btn{padding:10px 16px;font-size:14px}
.menu-btn{display:none;background:none;border:0;cursor:pointer;padding:8px}
.menu-btn span{display:block;width:22px;height:2px;background:var(--text);margin:5px 0;transition:.2s}
.mobile-nav{display:none;border-top:1px solid var(--line);background:var(--white)}
.mobile-nav.open{display:block}
.mobile-nav a{display:block;padding:14px 24px;border-bottom:1px solid var(--line);font-size:15px}

/* ---------- Hero trang chủ ---------- */
.hero{background:var(--deep);color:var(--tint);position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.15fr .95fr;gap:48px;align-items:center;padding:84px 0 72px}
.hero .eyebrow{color:var(--mint)}
.hero h1{font-size:clamp(30px,4.4vw,46px);color:var(--white)}
.hero p.sub{margin:18px 0 28px;color:#9FE1CB;font-size:17px;max-width:520px}
.hero-ctas{display:flex;gap:12px;flex-wrap:wrap}
.hero-note{margin-top:26px;font-family:var(--mono);font-size:12.5px;color:#6FBFA5;letter-spacing:.04em}
.hero-visual{position:relative}
.plate{border:1px solid var(--line-dark);border-radius:12px;background:var(--dark);padding:14px}
.plate-head{display:flex;justify-content:space-between;font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--mint);padding:0 4px 12px}
.plate img{border-radius:8px;width:100%;object-fit:cover;aspect-ratio:4/2.9}
.ph{border-radius:8px;background:repeating-linear-gradient(45deg,rgba(93,202,165,.06) 0 12px,transparent 12px 24px),#063E33;background-size:cover;background-position:center;aspect-ratio:4/2.9}

/* ---------- Hero trang con ---------- */
.page-hero{background:var(--deep);color:var(--tint);padding:56px 0 48px}
.page-hero .eyebrow{color:var(--mint)}
.page-hero h1{font-size:clamp(26px,3.6vw,38px);color:var(--white);max-width:760px}
.page-hero p.sub{margin-top:14px;color:#9FE1CB;font-size:16.5px;max-width:640px}
.page-hero .crumb{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:#6FBFA5;margin-bottom:18px}
.page-hero .crumb a:hover{color:var(--mint)}

/* ---------- Số liệu ---------- */
.stats{border-bottom:1px solid var(--line)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.stat{padding:30px 20px;text-align:center;border-left:1px solid var(--line)}
.stat:first-child{border-left:0}
.stat b{display:block;font-size:30px;font-weight:600;letter-spacing:-.01em}
.stat b em{font-style:normal;font-size:16px;color:var(--primary)}
.stat span{font-size:13.5px;color:var(--muted)}

/* ---------- Dải khách hàng ---------- */
.clients{padding:26px 0;border-bottom:1px solid var(--line);background:var(--paper)}
.clients .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:14px 30px;justify-content:center}
.clients .lbl{font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.clients .c{font-size:14.5px;font-weight:500;color:#3D4A46}

/* ---------- Card dịch vụ ---------- */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:36px}
.svc{border:1px solid var(--line);border-radius:12px;padding:24px;background:var(--white);transition:border-color .15s,transform .15s}
.svc:hover{border-color:var(--mint);transform:translateY(-2px)}
.svc .tag{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--primary);background:var(--tint);padding:3px 10px;border-radius:4px;display:inline-block}
.svc h3{font-size:17.5px;margin:14px 0 8px}
.svc p{font-size:14px;color:var(--muted)}
.svc ul{list-style:none;margin-top:12px}
.svc li{font-size:13.5px;color:var(--muted);padding:4px 0 4px 18px;position:relative}
.svc li::before{content:"—";position:absolute;left:0;color:var(--mint)}

/* ---------- Khối số hóa (nền tối) ---------- */
.digital{background:var(--deep);color:var(--tint)}
.digital .eyebrow{color:var(--mint)}
.digital h2{color:var(--white)}
.digital .lead{color:#9FE1CB}
.chain{display:flex;gap:10px;align-items:center;font-family:var(--mono);font-size:13px;color:var(--mint);margin:20px 0 36px;flex-wrap:wrap}
.chain b{font-weight:500;color:var(--tint);background:var(--dark);border:1px solid var(--line-dark);padding:6px 14px;border-radius:6px}
.dg-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.dg{border:1px solid var(--line-dark);border-radius:12px;padding:26px 24px;background:var(--dark);display:flex;flex-direction:column}
.dg .dot{width:38px;height:38px;border-radius:8px;background:rgba(93,202,165,.14);display:grid;place-items:center;color:var(--mint);font-family:var(--mono);font-size:12px;font-weight:500}
.dg h3{font-size:18px;margin:16px 0 8px;color:var(--white)}
.dg p{font-size:14px;color:#9FE1CB;flex:1}
.dg .chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}
.dg .chips i{font-style:normal;font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;border:1px solid var(--line-dark);color:#8FD8BC;padding:3px 8px;border-radius:4px}
.dg a.more{margin-top:18px;font-size:13.5px;color:var(--mint);font-weight:500}
.digital .cta-row{margin-top:36px;display:flex;gap:12px;flex-wrap:wrap}

/* ---------- Card dự án kiểu nameplate ---------- */
.pj-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:36px}
.pj{background:var(--white);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.pj-head{display:flex;justify-content:space-between;align-items:center;font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--muted);border-bottom:1px dashed var(--line);padding:12px 20px}
.pj-head b{color:var(--primary);font-weight:500}
.pj-body{padding:20px}
.pj h3{font-size:16.5px;margin-bottom:12px}
.pj table{width:100%;border-collapse:collapse;font-size:13px}
.pj td{padding:5px 0;vertical-align:top}
.pj td:first-child{font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;color:var(--muted);width:34%;text-transform:uppercase}
.pj td:last-child{color:#3D4A46}
.pj-photo{background:repeating-linear-gradient(45deg,rgba(15,110,86,.05) 0 12px,transparent 12px 24px),#EDF3F0;background-size:cover;background-position:center;height:180px;border-top:1px dashed var(--line)}
.pj-more{margin-top:28px;text-align:center}

/* ---------- Cam kết ---------- */
.cm-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:36px}
.cm{border-left:2px solid var(--mint);padding:4px 0 4px 18px}
.cm b{display:block;font-size:15px;font-weight:600;margin-bottom:4px}
.cm span{font-size:13.5px;color:var(--muted)}

/* ---------- Banner công cụ ---------- */
.tools{border:1px solid var(--line);border-radius:14px;background:var(--tint);padding:28px 30px;display:flex;align-items:center;gap:22px;justify-content:space-between;flex-wrap:wrap}
.tools h3{font-size:18px;color:var(--deep)}
.tools p{font-size:14px;color:#2C6A57;max-width:560px}

/* ---------- Liên hệ ---------- */
.contact{background:var(--deep);color:var(--tint)}
.ct-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start}
.contact h2{color:var(--white)}
.contact .lead{color:#9FE1CB}
.ct-list{margin-top:26px;display:grid;gap:14px;font-size:15px}
.ct-list div{display:flex;gap:12px;align-items:baseline}
.ct-list .k{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--mint);width:86px;flex:none;text-transform:uppercase}
.ct-card{background:var(--dark);border:1px solid var(--line-dark);border-radius:12px;padding:28px}
.ct-card h3{color:var(--white);font-size:17px;margin-bottom:6px}
.ct-card p{font-size:14px;color:#9FE1CB;margin-bottom:20px}
.ct-card .btn{width:100%;justify-content:center}
.ct-card .or{font-family:var(--mono);font-size:11.5px;color:#6FBFA5;text-align:center;margin:12px 0}

/* ---------- Dải ảnh trang giải pháp ---------- */
.img-band{padding:28px 0 0}
.img-frame{border:1px solid var(--line);border-radius:12px;background:repeating-linear-gradient(45deg,rgba(15,110,86,.05) 0 12px,transparent 12px 24px),#EDF3F0;background-size:cover;background-position:center;aspect-ratio:16/6;min-height:200px}
@media (max-width:720px){.img-frame{aspect-ratio:16/9}}

/* ---------- Nội dung bài viết (trang con nhiều chữ) ---------- */
.prose{max-width:760px}
.prose h2{margin:40px 0 12px;font-size:24px}
.prose h3{margin:28px 0 10px;font-size:18px}
.prose p{margin-bottom:14px;color:#2E3A36}
.prose ul{margin:0 0 16px 20px}
.prose li{margin-bottom:6px;color:#2E3A36}
.prose .note{font-size:14px;color:var(--muted);border-left:2px solid var(--mint);padding-left:14px}

/* ---------- Bảng dữ liệu ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:14px;margin-top:24px}
.tbl th{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);background:var(--paper)}
.tbl td{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top;color:#2E3A36}
.tbl tr:hover td{background:var(--paper)}

/* ---------- Lưới tiện ích ---------- */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.card{border:1px solid var(--line);border-radius:12px;padding:24px;background:var(--white)}
.card h3{font-size:17px;margin-bottom:8px}
.card p{font-size:14px;color:var(--muted)}

/* ---------- Footer ---------- */
footer.site{background:#032722;color:#7FB8A4;font-size:13px}
.ft{display:flex;justify-content:space-between;gap:20px;padding:26px 0;flex-wrap:wrap;align-items:center}
.ft .legal{font-family:var(--mono);font-size:11.5px;letter-spacing:.03em}
.ft a:hover{color:var(--mint)}

/* ---------- Thanh mobile ghim đáy ---------- */
.mbar{display:none;position:fixed;bottom:0;left:0;right:0;z-index:70;background:var(--white);border-top:1px solid var(--line)}
.mbar a{flex:1;display:flex;align-items:center;justify-content:center;gap:8px;padding:13px;font-size:14px;font-weight:500}
.mbar .call{background:var(--primary);color:var(--tint)}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:34px;padding:56px 0}
  .svc-grid,.dg-grid{grid-template-columns:1fr 1fr}
  .pj-grid,.grid-2{grid-template-columns:1fr}
  .cm-grid{grid-template-columns:1fr 1fr}
  .ct-grid{grid-template-columns:1fr;gap:32px}
}
@media (max-width:720px){
  .nav-links,.nav-cta .btn{display:none}
  .menu-btn{display:block}
  .sec{padding:56px 0}
  .stats-grid{grid-template-columns:1fr 1fr}
  .stat{border:0;border-top:1px solid var(--line)}
  .stat:nth-child(-n+2){border-top:0}
  .stat:nth-child(2n){border-left:1px solid var(--line)}
  .svc-grid,.dg-grid,.cm-grid{grid-template-columns:1fr}
  .mbar{display:flex}
  body{padding-bottom:52px}
  .tbl{display:block;overflow-x:auto}
}