/* Màu chính: đổi ở đây là đổi toàn bộ website */
:root{--bg:#f3f5f9;--surface:#fff;--ink:#1d2433;--mute:#566074;--line:#d5dbe6;--blue:#2f55a4;--navy:#243567;--orange:#f58220;--orange-ink:#a8520a;--head:#243567;--brand:#2f55a4;--on-navy:#c9d2ea;box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);color-scheme:light}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0e1424;--surface:#161e33;--ink:#e6eaf3;--mute:#a1abc2;--line:#2a3452;--orange-ink:#ffab5e;--head:#9db6f0;--brand:#7fa2ee;color-scheme:dark}}
:root[data-theme="dark"]{--bg:#0e1424;--surface:#161e33;--ink:#e6eaf3;--mute:#a1abc2;--line:#2a3452;--orange-ink:#ffab5e;--head:#9db6f0;--brand:#7fa2ee;color-scheme:dark}
/* Thang cỡ chữ: chỉ dùng 6 cỡ này cho toàn website */
:root{--fs-xs:13px;--fs-sm:15px;--fs-base:17px;--fs-lg:20px;--fs-xl:clamp(26px,3.4vw,34px);--fs-2xl:clamp(30px,4.6vw,46px)}
*,*::before,*::after{box-sizing:border-box}
html{scroll-padding-top:66px;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font:400 var(--fs-base)/1.6 Roboto,"Segoe UI",Arial,sans-serif}
h1,h2,h3{margin:0;line-height:1.2;font-weight:700;text-wrap:balance}
a{color:var(--blue)}
img{max-width:100%}
:focus-visible{outline:3px solid var(--orange);outline-offset:2px}
.wrap{max-width:1140px;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}

/* Header: logo trái, hotline phải */

/* Menu */

/* Banner */
/* Thanh menu: logo (Trang chủ), các mục, hỗ trợ liên hệ */
.nav{background:linear-gradient(#3a62b3,#2c4e98);position:sticky;top:env(safe-area-inset-top,0px);z-index:5;color:#fff}
.nav .wrap{display:flex;align-items:center;gap:0 8px}
.nav .logo{display:flex;align-items:center;padding:6px 0;margin-right:22px}
.nav .logo img{height:50px;width:auto;display:block}
.links{display:flex}
.nav .links a{color:#fff;text-decoration:none;font-weight:700;padding:19px 15px;white-space:nowrap;text-transform:uppercase;font-size:var(--fs-sm);letter-spacing:.02em}
.nav .links a:hover,.nav .links a.on{background:var(--orange)}
.hot{display:flex;align-items:center;gap:10px;line-height:1.3;margin-left:auto;padding-block:6px}
.hot i{width:34px;height:34px;border-radius:50%;background:var(--orange);display:grid;place-items:center;flex:none}
.hot i svg{width:18px;height:18px}
.hot b{display:block;color:#fff;font-size:var(--fs-sm);white-space:nowrap}
.hot b a{color:#fff;text-decoration:none}
.hot b a:hover{text-decoration:underline}
.hot b span{color:var(--on-navy);font-weight:400}
.banner{background:var(--navy);color:#fff;padding-block:52px 56px}
.banner h1{font-size:var(--fs-2xl);margin-bottom:14px}
.banner p{max-width:62ch;margin:0;color:var(--on-navy)}
.banner.sm{padding-block:34px 38px}
.banner.sm h1{font-size:var(--fs-xl);margin-bottom:8px}
.home .wrap{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:40px;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:var(--fs-xs);font-weight:700;color:var(--orange)!important;margin-bottom:10px!important}
.intro p+p{margin-top:12px}

/* Khung đại lý */
.dl{border:1px solid #4a5c94;background:rgba(255,255,255,.05);padding:22px 24px}
.dl h2{color:#fff;font-size:var(--fs-sm);text-transform:uppercase;letter-spacing:.1em;margin-bottom:12px}
.dl ul{list-style:none;margin:0 0 16px;padding:0}
.dl li{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding-block:9px;border-bottom:1px solid #3d4f86}
.dl li:last-child{border-bottom:0}
.dl li b{font-size:var(--fs-lg);letter-spacing:.01em}
.dl li span{color:var(--on-navy);font-size:var(--fs-sm);text-align:right}
.dl a{color:var(--orange);font-weight:700;text-decoration:none}
.dl a::after{content:" →"}
.dl a:hover{text-decoration:underline}
.dl li a{color:#fff;font-weight:700;text-decoration:none}
.dl li a::after{content:" ↗";font-size:.6em;color:var(--on-navy);vertical-align:.25em}
.dl li a:hover{text-decoration:underline;text-underline-offset:4px}

/* Dải số liệu */
.stats{background:var(--surface);border-bottom:1px solid var(--line)}
.stats .wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.stats div{padding-block:18px;color:var(--mute);font-size:var(--fs-sm)}
.stats b{display:block;font-size:var(--fs-xl);color:var(--blue);line-height:1.1;font-variant-numeric:tabular-nums}

/* Nội dung chung */
section{padding-block:52px}
h2{font-size:var(--fs-xl);color:var(--head);margin-bottom:8px}
.lead{color:var(--mute);max-width:62ch;margin:0 0 26px}
.alt-bg{background:var(--surface);border-block:1px solid var(--line)}
.card{background:var(--surface);border:1px solid var(--line);padding:18px 20px}
.card h3{font-size:var(--fs-lg);margin-bottom:6px}
.card p{margin:0;color:var(--mute);font-size:var(--fs-sm)}
.g{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px}
.btn{display:inline-block;background:var(--orange);color:#1d1203;font-weight:700;padding:12px 26px;border:0;text-decoration:none;font-size:var(--fs-base);cursor:pointer;font-family:inherit}
.btn:hover{filter:brightness(1.06)}

/* Thẻ sản phẩm có ảnh */
.pg{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:18px}
.pc{background:var(--surface);border:1px solid var(--line);display:flex;flex-direction:column}
.pc img{display:block;width:100%;height:auto;aspect-ratio:1;object-fit:cover;background:#fff;border-bottom:1px solid var(--line)}
.pc div{padding:14px 16px 16px}
.pc h3{font-size:var(--fs-lg);margin-bottom:4px}
.pc p{margin:0;color:var(--mute);font-size:var(--fs-sm)}

/* Chứng thư */
.certs{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;align-items:start}
.certs figure{margin:0;background:var(--surface);border:1px solid var(--line);border-top:4px solid var(--blue)}
.cz{display:block;width:100%;padding:0;border:0;background:#fff;cursor:zoom-in}
.cz img{display:block;width:100%;height:auto}
.certs figcaption{padding:10px 14px;font-weight:700;font-size:var(--fs-sm)}
.certs figcaption small{display:block;font-weight:400;color:var(--mute);font-size:var(--fs-xs)}
.certs.three{grid-template-columns:repeat(3,minmax(0,1fr));max-width:900px}
.note{margin:22px 0 0;padding:14px 18px;background:var(--surface);border:1px solid var(--line);color:var(--mute);max-width:72ch}
.note b{color:var(--ink)}
#lb{border:0;padding:0;background:transparent;max-width:min(92vw,820px);max-height:92vh}
#lb::backdrop{background:rgba(10,16,32,.8)}
#lb img{display:block;max-width:100%;max-height:92vh;margin:0 auto;background:#fff;cursor:zoom-out}

/* Tư vấn kỹ thuật */
.tv{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(300px,100%),1fr));gap:18px;margin-bottom:38px}
.tv .card{border-top:4px solid var(--blue)}
.tv .card h3{font-size:var(--fs-lg);margin-bottom:10px}
.tv .card p{margin:0 0 12px;font-size:var(--fs-base)}
.tv h4{margin:16px 0 6px;font-size:var(--fs-sm)}
.ref{margin:0;padding-left:20px;font-size:var(--fs-sm)}
.ref a{color:var(--orange-ink);font-weight:700}
.sub{font-size:var(--fs-lg);margin-bottom:14px}
.tags{display:flex;flex-wrap:wrap;gap:10px}
.tags span{border:1px solid var(--line);background:var(--bg);padding:6px 14px;border-radius:20px;font-size:var(--fs-sm)}

/* Liên hệ */
.ct{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.12fr);gap:36px;align-items:start}
.card.form{padding:24px}
form{display:grid;gap:6px}
label{font-weight:700;font-size:var(--fs-sm);margin-top:8px}
input,textarea{font:inherit;padding:10px 12px;border:1px solid var(--line);background:var(--bg);color:var(--ink);width:100%}
textarea{min-height:110px;resize:vertical}
form .btn{justify-self:start;margin-top:12px}
.info h3{font-size:var(--fs-lg);margin-bottom:14px;color:var(--head)}
.card.form h3{font-size:var(--fs-lg);color:var(--head);margin-bottom:6px}
h3.sub{color:var(--head)}
.g+.sub{margin-top:40px}
.info p{margin:0 0 10px}
.info .name{text-wrap:balance;font-size:var(--fs-xl);font-weight:700;line-height:1.2;color:var(--brand)}
.info a{color:var(--orange-ink);font-weight:700}

/* Chân trang */
footer{background:var(--navy);color:#b8c3e0;padding-block:28px;font-size:var(--fs-base);text-align:center}
footer p{margin:0 0 6px}
footer strong{font-size:var(--fs-lg)}
footer strong{color:#fff}
footer a{color:#fff}
footer .copy{margin-top:10px;opacity:.75}

@media (max-width:760px){
 .home .wrap,.ct{grid-template-columns:1fr}
 .home .wrap{gap:28px}
 section{padding-block:40px}
 .stats .wrap{grid-template-columns:repeat(3,auto);justify-content:space-between;gap:8px}
 .stats b{white-space:nowrap}
 .stats div{line-height:1.3}
 .stats b{margin-bottom:4px}
 .pg{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
 .pc div{padding:10px 12px 12px}
 .pc h3{font-size:var(--fs-base)}
}
@media (max-width:760px){.certs.three{gap:10px}.certs.three figcaption{padding:8px;font-size:var(--fs-xs)}}
@media (max-width:1020px){
 .nav{position:static}
 html{scroll-padding-top:8px}
 .nav .wrap{flex-wrap:wrap;gap:0;padding-left:0;padding-right:0}
 .nav .logo{order:1;margin-right:0;padding:8px 14px 8px max(16px,env(safe-area-inset-left,0px))}
 .nav .logo img{height:52px}
 .hot{order:2;padding-right:max(16px,env(safe-area-inset-right,0px))}
 .links{order:3;flex:1 1 100%;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.2);padding-inline:max(0px,env(safe-area-inset-left,0px)) max(0px,env(safe-area-inset-right,0px))}
 .nav .links a{flex:1 1 auto;text-align:center;padding:13px 10px}
}
@media (max-width:460px){.hot b span.l{display:block}.hot{gap:8px}.nav .logo{padding-inline:max(12px,env(safe-area-inset-left,0px)) 8px}.nav .logo img{height:46px}}
@media (max-width:340px){.hot i{display:none}.nav .links a{font-size:var(--fs-xs);padding:11px 5px}}
@media (max-width:420px){.stats b{font-size:var(--fs-lg)}}
h2+.tv{margin-top:26px}
/* Mục Liên hệ: hai khung cùng chiều cao, đầu cột thẳng hàng */
.ct{align-items:stretch}
.card.form,.card.info{padding:24px}
.card.info{display:flex;flex-direction:column}
.info h3{margin-bottom:10px}
.info .name{margin:0 0 18px;line-height:1.2}
.info .rows{flex:1;display:grid;grid-auto-rows:1fr}
.info .rows span{text-wrap:balance}
.info .rows p{margin:0;display:flex;align-items:center;padding-block:12px;border-top:1px solid var(--line);color:var(--ink);font-size:var(--fs-base)}
/* Từ khóa: toàn bộ danh mục nằm trong một khung */
.kw-title{margin-top:56px}
.kwbox{margin-top:18px;background:var(--surface);border:1px solid var(--line);border-top:4px solid var(--blue);padding:24px}
.kw{columns:3 260px;column-gap:36px;column-rule:1px solid var(--line)}
.kw article{break-inside:avoid;margin:0 0 24px}
.kw h4{margin:0;font-size:var(--fs-base);line-height:1.35;color:var(--head)}
.kw .en{display:block;margin-top:3px;color:var(--mute);font-size:var(--fs-sm)}
.kw ul{margin:10px 0 0;padding-left:18px;font-size:var(--fs-sm)}
.kw li{margin-bottom:8px}
.kw li:last-child{margin-bottom:0}
.kw li em{display:block;font-style:normal;color:var(--mute)}
@media (max-width:760px){.kwbox{padding:18px}}
/* Tên công ty ở Liên hệ: luôn một dòng, chữ tự nhỏ lại theo bề rộng khung */
.card.info{container-type:inline-size}
.info .name{white-space:nowrap;font-size:clamp(16px,6cqw,var(--fs-xl))}
@media (max-width:1100px){.ct{grid-template-columns:1fr}}
/* Tiêu đề Giới thiệu: một dòng, không dài hơn đoạn giới thiệu bên dưới */
.intro{container-type:inline-size}
.banner .intro h1{font-size:clamp(20px,6.2cqw,var(--fs-xl));white-space:nowrap}
/* Dải số liệu: số và chữ bên dưới cùng căn giữa từng ô */
.stats .wrap{grid-template-columns:repeat(3,1fr)}
.stats div{text-align:center;white-space:nowrap}
@media (max-width:420px){.stats .wrap{grid-template-columns:repeat(3,1fr);gap:4px}.stats div{font-size:var(--fs-xs)}}