/* ==========================================================================
   Siemens Việt Nam — Fast Group Engineering
   Kế thừa nguyên hệ thiết kế của rosemount-emerson-viet-nam/assets/site.css,
   chỉ đổi bộ biến màu sang tông petrol của Siemens.
   Font hỗ trợ tiếng Việt: Be Vietnam Pro.
   ========================================================================== */

:root{
  /* --- he mau Emerson: xanh cong nghiep + xanh sang cho CTA --- */
  --blue:#00707a;          /* xanh Emerson chinh (Pantone 2146C) */
  --blue-dark:#00555c;
  --blue-deep:#000028;
  --blue-tint:#e7f4f4;
  --magenta:#00808a;       /* xanh sang, dung cho CTA/nut bam */
  --magenta-dark:#00646c;
  --magenta-tint:#e6f4f5;
  --silver:#9fa1a4;        /* bac Emerson (Pantone 877C) */

  /* --- trung tinh --- */
  --ink:#262728;
  --ink-soft:#4a4d50;
  --muted:#6b6e72;
  --faint:#a8aaad;
  --line:#d9dadc;
  --line-soft:#ebecee;
  --surface:#f3f3f3;        /* xam trung tinh — he mau nen cua emerson.com */
  --surface-2:#eaeaeb;
  --white:#fff;
  --page-bg:#f3f3f3;

  /* --- 6 nhom san pham, moi nhom mot ton mau --- */
  --t-pressure:#004b8d;
  --t-flow:#0072ce;
  --t-level:#0a7ea4;
  --t-temp:#c0521a;
  --t-gas:#5a3fa0;
  --t-liquid:#0f8a5f;

  --radius:0;
  --container:1220px;
  --shadow:0 1px 2px rgba(30,38,46,.06);
  --serif:"Noto Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  --sans:"Noto Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--page-bg);color:var(--ink);
  font-family:var(--sans);font-size:16px;font-weight:400;line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button,input,textarea,select{font:inherit}
.container,.header-inner,.footer-inner{width:min(var(--container),calc(100% - 48px));margin:0 auto}
.center{text-align:center}

/* ---------- chữ ---------- */
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);margin-top:0;letter-spacing:0}
h1{margin-bottom:20px;font-size:clamp(2.1rem,3.3vw,2.75rem);line-height:1.28;font-weight:300}
h2{font-size:clamp(1.6rem,2.5vw,2.25rem);line-height:1.34;font-weight:300}
h3{font-size:1.25rem;line-height:1.4;font-weight:500}
h4{font-size:1rem;line-height:1.45;font-weight:600}
p{margin-top:0}
strong{font-weight:600}
em{font-style:italic}
.lead{max-width:62ch;margin-bottom:26px;color:var(--ink-soft);font-size:1.0625rem;line-height:1.6;font-weight:400}
.eyebrow,.kicker{
  display:block;margin-bottom:12px;color:var(--muted);
  font-family:var(--sans);font-size:.75rem;font-weight:700;
  letter-spacing:.04em;text-transform:uppercase;
}
.meta-line{margin-bottom:0;color:var(--blue)!important;font-size:.85rem;font-weight:600}

/* ---------- thanh điều hướng ---------- */
.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.97);
  border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.header-inner{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:26px}
.brand{min-width:250px;display:inline-flex;align-items:center;gap:12px}
.brand-logo{height:24px;width:auto;flex:0 0 auto;display:block}
.footer-logo-img{height:24px;width:auto;display:block;background:#fff;padding:6px 9px;border-radius:2px}
.brand-name{display:block;font-family:var(--serif);font-size:1.05rem;font-weight:600;line-height:1.2;color:var(--blue);letter-spacing:0}
.brand-sub{display:block;margin-top:1px;color:var(--muted);font-size:.76rem;font-weight:400;letter-spacing:.02em}
.nav{display:flex;align-items:center;gap:24px;font-size:.75rem;font-weight:700;color:var(--ink);
  letter-spacing:.04em;text-transform:uppercase}
.nav a,.nav-dropdown summary{position:relative;padding:26px 0;cursor:pointer;white-space:nowrap}
.nav-cta{white-space:nowrap}
@media(min-width:981px){.brand-name{white-space:nowrap}}
@media(min-width:981px) and (max-width:1180px){.nav{gap:16px;font-size:.7rem}.header-inner{gap:16px}}
.nav a:after,.nav-dropdown summary:after{content:"";position:absolute;left:0;right:0;bottom:20px;height:2px;
  background:var(--blue);transform:scaleX(0);transform-origin:left;transition:transform .18s ease}
.nav a:hover:after,.nav-dropdown summary:hover:after,.nav-dropdown[open] summary:after{transform:scaleX(1)}
.nav-dropdown{position:relative}
.nav-dropdown summary{display:inline-flex;align-items:center;gap:7px;list-style:none}
.nav-dropdown summary::-webkit-details-marker{display:none}
.nav-dropdown summary:before{content:"";width:6px;height:6px;margin-top:-3px;border-right:1.5px solid currentColor;
  border-bottom:1.5px solid currentColor;transform:rotate(45deg);transition:transform .18s ease}
.nav-dropdown[open] summary:before{margin-top:3px;transform:rotate(225deg)}
.nav-dropdown-panel{position:absolute;top:calc(100% - 12px);left:50%;z-index:40;width:360px;display:grid;gap:2px;
  padding:10px;border:1px solid var(--line);border-top:2px solid var(--blue);background:#fff;
  box-shadow:0 18px 40px rgba(30,42,55,.14);transform:translateX(-50%)}
.nav-dropdown-panel a{padding:10px 12px;color:var(--ink);white-space:normal;font-size:.875rem;
  font-weight:400;letter-spacing:0;text-transform:none}
.nav-dropdown-panel a:after{content:none}
.nav-dropdown-panel a:hover{color:var(--blue);background:var(--blue-tint)}
.nav-cta{min-height:38px;display:inline-flex;align-items:center;padding:0 18px!important;
  color:#fff!important;background:var(--magenta);border-radius:var(--radius);font-weight:500;font-size:.75rem;
  letter-spacing:.04em;text-transform:uppercase}
.nav-cta:after{content:none!important}
.nav-cta:hover{background:var(--magenta-dark)}

/* ---------- nút ---------- */
.button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:0 22px;
  border:1px solid transparent;border-radius:var(--radius);font-weight:500;font-size:.875rem;
  letter-spacing:.03em;text-transform:uppercase;
  white-space:nowrap;cursor:pointer;transition:background .18s ease,border-color .18s ease,color .18s ease}
.button-primary{color:#fff;background:var(--magenta)}
.button-primary:hover{background:var(--magenta-dark)}
.button-secondary{color:var(--ink);background:#fff;border-color:var(--line)}
.button-secondary:hover{color:var(--blue);border-color:var(--blue)}

/* ---------- hero: nền sáng hai tông ---------- */
.hero{
  background:
    linear-gradient(90deg,var(--surface) 0 57%,#fff 57% 100%),
    var(--hero-image) right 7% center/auto 72% no-repeat,
    var(--surface);
  border-bottom:1px solid var(--line);
}
.hero-inner{min-height:auto;padding:76px 0 72px;display:grid;align-content:center}
.hero-copy{width:min(640px,100%)}
.hero h1{max-width:16ch}
.hero .lead{color:var(--ink-soft)}
.hero-slim .hero-inner{padding:62px 0 58px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}

/* ---------- dải số liệu ---------- */
.metric-strip{border-bottom:1px solid var(--line);background:#fff}
.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
.metric{padding:26px 28px;border-left:1px solid var(--line)}
.metric:first-child{border-left:0;padding-left:0}
.metric strong{display:block;font-family:var(--serif);font-size:1.6rem;font-weight:300;line-height:1.25;color:var(--ink)}
.metric span{display:block;margin-top:4px;color:var(--muted);font-size:.9rem}

/* ---------- khối nội dung ---------- */
.section{padding:82px 0}
.section-soft{background:var(--white);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-heading{max-width:74ch;margin-bottom:38px}
.section-heading.center{margin-right:auto;margin-left:auto;text-align:center}
.section-heading h2{margin:0 0 14px}
.section-heading p{margin:0;color:var(--muted);font-size:1rem;line-height:1.6}
.grid{display:grid;gap:2px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(320px,.62fr);gap:44px;align-items:start}

/* ---------- thẻ ---------- */
.card,.product-card,.contact-card,.form-panel,.step-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.card{padding:28px}
.card h3{margin-bottom:10px}
.card p{margin-bottom:0;color:var(--muted);font-size:.96rem}
.category-card{display:flex;flex-direction:column;min-height:100%;overflow:hidden;padding:0;
  transition:border-color .18s ease,box-shadow .18s ease}
.category-card:hover,.product-card:hover{border-color:var(--blue);box-shadow:0 10px 30px rgba(30,42,55,.09)}
.category-card h3,.category-card p{margin-right:26px;margin-left:26px}
.category-card h3{margin-top:24px}
.category-card .meta-line{margin-top:auto;margin-bottom:26px;padding-top:10px}
.category-media{height:212px;display:grid;place-items:center;padding:22px 24px 6px;background:#fff;
  border-bottom:0}
.category-media img{width:min(100%,275px);height:176px;object-fit:contain}
.product-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:stretch;gap:2px}
.product-card{min-height:100%;display:flex;flex-direction:column;overflow:hidden;
  transition:border-color .18s ease,box-shadow .18s ease}
.product-media{height:266px;display:grid;place-items:center;padding:24px 26px 6px;background:#fff;
  border-bottom:0}
.product-media img{width:min(100%,285px);height:220px;object-fit:contain}
.product-body{flex:1;display:flex;flex-direction:column;padding:22px 24px 24px}
.product-meta{margin-bottom:8px;color:var(--muted);font-size:.75rem;font-weight:700;
  letter-spacing:.04em;text-transform:uppercase}
.product-body h3{margin-bottom:8px;font-size:1.14rem}
.product-body p{margin-bottom:0;color:var(--muted);font-size:.95rem}
.product-body .meta-line{margin-top:auto;padding-top:12px}

/* ton mau theo nhom san pham */
.t-pressure{--tone:var(--t-pressure)} .t-flow{--tone:var(--t-flow)}
.t-level{--tone:var(--t-level)} .t-temp{--tone:var(--t-temp)}
.t-gas{--tone:var(--t-gas)} .t-liquid{--tone:var(--t-liquid)}
.category-card[class*="t-"],.product-card[class*="t-"]{border-top:3px solid var(--tone)}
.category-card[class*="t-"]:hover,.product-card[class*="t-"]:hover{border-color:var(--tone)}
.category-card[class*="t-"] .meta-line,.product-card[class*="t-"] .meta-line{color:var(--tone)!important}
.hero-slim[class*="t-"],.product-hero[class*="t-"]{--tone:var(--tone)}

/* ---------- danh sách ---------- */
.check-list{display:grid;gap:14px;margin:24px 0 0;padding:0;list-style:none}
.check-list li{display:block;position:relative;padding-left:26px;color:var(--ink-soft)}
.check-list li:before{content:"";position:absolute;left:0;top:11px;width:10px;height:2px;background:var(--magenta)}
.spec-list{display:grid;gap:10px;margin:14px 0 0;padding:0;list-style:none}
.spec-list li{position:relative;padding-left:22px;color:var(--ink-soft)}
.spec-list li:before{content:"";position:absolute;left:0;top:11px;width:8px;height:2px;background:var(--blue)}
.hub-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:2px;margin:26px 0}
.hub-grid a{display:block;padding:18px 20px;background:#fff;border:1px solid var(--line);
  color:var(--ink);font-weight:400;font-size:.98rem;transition:.18s ease;word-break:break-word}
.hub-grid a:hover{border-color:var(--blue);color:var(--blue)}

/* ---------- bảng ---------- */
.spec-table{display:grid;border:1px solid var(--line);background:#fff}
.spec-row{display:grid;grid-template-columns:minmax(190px,.4fr) minmax(0,1fr);gap:20px;padding:15px 18px;
  border-bottom:1px solid var(--line-soft)}
.spec-row:last-child{border-bottom:0}
.spec-row span{color:var(--muted);font-size:.85rem}
.spec-row strong{color:var(--ink);font-weight:600;overflow-wrap:anywhere}

/* ---------- khối nhấn ---------- */
.quote-panel{padding:34px;background:var(--blue-deep);color:#fff;border-radius:var(--radius)}
.quote-panel h2,.quote-panel h3{color:#fff}
.quote-panel .kicker{color:rgba(255,255,255,.62)}
.quote-panel p{color:rgba(255,255,255,.82)}
.quote-list{display:grid;gap:1px;margin:22px 0 26px;padding:0;list-style:none}
.quote-list li{padding:12px 14px;background:rgba(255,255,255,.08);color:rgba(255,255,255,.92);font-size:.95rem}
.quote-panel .button-secondary{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.quote-panel .button-secondary:hover{color:var(--blue-deep);background:#fff;border-color:#fff}

/* ---------- hero trang con ---------- */
.page-hero{
  background:
    linear-gradient(90deg,var(--surface) 0 60%,#fff 60% 100%),
    var(--page-image) right 6% center/auto 74% no-repeat,
    var(--surface);
  border-bottom:1px solid var(--line);
}
.page-hero-inner{padding:64px 0 60px}
.page-hero h1{max-width:22ch;margin-bottom:16px}
.page-hero .lead{margin-bottom:0;max-width:58ch}
.category-hero .page-hero-inner{padding-top:70px;padding-bottom:66px}
.breadcrumb-bar{background:#fff;border-bottom:1px solid var(--line);font-size:.86rem}
.breadcrumb-bar .container{padding-top:13px;padding-bottom:13px;color:var(--muted)}
.breadcrumb-bar a{color:var(--blue)}
.breadcrumb-bar a:hover{text-decoration:underline}

/* ---------- FAQ ---------- */
.faq-list{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.faq-item{padding:2px 22px;background:#fff}
.faq-item summary{padding:17px 0;color:var(--ink);font-weight:600;cursor:pointer;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:before{content:"+";display:inline-block;width:20px;color:var(--magenta);font-weight:400}
.faq-item[open] summary:before{content:"–"}
.faq-item p{margin:0 0 18px 20px;color:var(--ink-soft)}

/* ---------- liên hệ ---------- */
.contact-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(310px,.55fr);gap:2px;align-items:start}
.form-panel{padding:32px}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.field{display:grid;gap:7px}
.field.full{grid-column:1/-1}
.field label{color:var(--muted);font-size:.78rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase}
.field input,.field textarea,.field select{width:100%;min-width:0;border:1px solid var(--line);
  border-radius:var(--radius);background:#fff;color:var(--ink);outline:none}
.field input,.field select{height:48px;padding:0 14px}
.field input:focus,.field textarea:focus{border-color:var(--blue)}
.field textarea{min-height:150px;padding:13px;resize:vertical}
.form-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.contact-stack{display:grid;gap:2px}
.contact-card{padding:24px}
.contact-card h3{margin-bottom:8px;font-size:1.06rem}
.contact-card p{margin-bottom:0;color:var(--muted)}
.contact-card a{color:var(--blue);font-weight:600}

/* ---------- bài viết (pillar) ---------- */
.article-body{max-width:74ch;margin:0 auto}
.article-body h2{margin:38px 0 14px}
.article-body h3{margin:28px 0 10px;font-size:1.14rem}
.article-body p,.article-body li{color:var(--ink-soft);font-size:1.0625rem;line-height:1.72}
.article-body p{margin-bottom:18px}
.article-body ul,.article-body ol{padding-left:22px;margin:0 0 20px}
.article-body li{margin-bottom:8px}
.article-body a{color:var(--blue);font-weight:600}
.article-body a:hover{text-decoration:underline}
.article-insight{margin:32px 0;padding:26px 28px;background:var(--surface-2);
  border:1px solid var(--line);border-left:3px solid var(--blue)}
.article-insight h2{margin:0 0 16px!important;font-size:1.2rem}
.article-insight.caution{border-left-color:var(--t-temp);background:#fdf3ec;border-color:#f4dcc9}
.insight-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.insight-grid strong{display:block;margin-bottom:8px;color:var(--ink);font-size:.95rem}
.insight-grid ul{display:grid;gap:6px;margin:0;padding-left:18px}
.insight-grid li{font-size:.94rem}
.article-highlight{margin:26px 0;padding:20px 24px;background:var(--blue-tint);
  border:1px solid #cfe6e7;border-radius:var(--radius)}
.article-highlight p{margin:0;color:var(--ink-soft)}
.article-table,.md-table{width:100%;border-collapse:collapse;font-size:.95rem;margin:0}
.md-table-wrap,.table-wrap{overflow-x:auto;margin:26px 0;border:1px solid var(--line);background:#fff}
.article-table th,.article-table td,.md-table th,.md-table td{padding:13px 16px;
  border-bottom:1px solid var(--line-soft);text-align:left;vertical-align:top}
.article-table th,.md-table th{color:var(--muted);background:var(--surface-2);font-size:.75rem;font-weight:700;
  letter-spacing:.04em;text-transform:uppercase}
.article-table tr:last-child td,.md-table tr:last-child td{border-bottom:0}
.article-body .article-table,.article-body .md-table{min-width:520px}
.content-figure{margin:30px 0;border:1px solid var(--line);background:var(--white);overflow:hidden}
.content-figure img{display:block;width:100%;height:auto}
.content-figure figcaption{padding:11px 16px;background:#fff;border-top:1px solid var(--line-soft);
  color:var(--muted);font-size:.84rem;line-height:1.55}
.related-articles{margin:38px 0 0;display:grid;gap:2px}
.related-siblings{grid-template-columns:repeat(2,minmax(0,1fr))}
.related-siblings h3{grid-column:1/-1}
.related-siblings .related-link span{color:var(--blue)}
@media(max-width:700px){.related-siblings{grid-template-columns:1fr}}
.related-articles h3{margin:0 0 6px}
.related-link{display:block;padding:16px 20px;background:#fff;border:1px solid var(--line)}
.related-link:hover{border-color:var(--blue)}
.related-link span{display:block;margin-bottom:4px;color:var(--muted);font-size:.75rem;font-weight:700;
  letter-spacing:.04em;text-transform:uppercase}
.related-link p{margin:0;color:var(--ink);font-weight:600}

/* ---------- disclaimer ---------- */
.disclaimer{margin:0;padding:16px 20px;background:var(--surface-2);border:1px solid var(--line);
  border-left:3px solid var(--silver);color:var(--muted);font-size:.86rem;line-height:1.6}
.disclaimer strong{color:var(--ink-soft)}

/* ---------- dải CTA "mua ở đâu" ---------- */
.buy-strip{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.buy-inner{padding:52px 0;display:grid;grid-template-columns:minmax(0,1.25fr) minmax(280px,.75fr);
  gap:44px;align-items:start}
.buy-copy h2{margin:0 0 12px;font-size:clamp(1.4rem,2vw,1.8rem)}
.buy-copy p{margin:0;max-width:56ch;color:var(--ink-soft)}
.buy-copy .hero-actions{margin-top:22px}
.buy-places{display:grid;gap:2px}
.buy-place{padding:16px 20px;background:#fff;border:1px solid var(--line)}
.buy-place span{display:block;margin-bottom:4px;color:var(--muted);font-size:.75rem;font-weight:700;
  letter-spacing:.04em;text-transform:uppercase}
.buy-place p{margin:0;color:var(--ink);font-size:.95rem}
.buy-place a{color:var(--blue);font-weight:600}
@media(max-width:900px){.buy-inner{grid-template-columns:1fr;gap:28px;padding:44px 0}}

/* ---------- chân trang ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.7)}
.footer-inner{padding:64px 0 34px}
.footer-kicker{margin-bottom:30px;color:rgba(255,255,255,.5);font-size:.75rem;font-weight:700;
  letter-spacing:.04em;text-transform:uppercase}
.footer-main{display:grid;grid-template-columns:1.3fr .85fr .95fr 1.3fr;gap:36px;padding-bottom:38px}
.footer-logo{display:inline-flex;align-items:center;gap:12px;margin-bottom:20px;color:#fff}
.footer-logo-title,.footer-logo-sub{display:block}
.footer-logo-title{font-family:var(--serif);font-size:1.05rem;font-weight:600;letter-spacing:0}
.footer-logo-sub{margin-top:2px;color:rgba(255,255,255,.55);font-size:.76rem}
.footer-brand p{max-width:44ch;margin:0;color:rgba(255,255,255,.68);font-size:.95rem}
.footer-company{display:grid;gap:4px;margin-top:24px;padding:16px 18px;border:1px solid rgba(255,255,255,.14)}
.footer-company strong,.footer-company span{display:block}
.footer-company strong{color:#fff;font-size:.75rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}
.footer-company span{color:rgba(255,255,255,.58);font-size:.86rem}
.footer-column h3{margin:4px 0 18px;color:#fff;font-size:1rem}
.footer-links{display:grid;gap:10px}
.footer-links a{color:rgba(255,255,255,.68);font-size:.94rem;transition:color .18s ease}
.footer-links a:hover{color:#fff}
.footer-contact{display:grid;gap:14px}
.footer-contact span{display:block;margin-bottom:3px;color:rgba(255,255,255,.45);font-size:.75rem;
  font-weight:700;letter-spacing:.04em;text-transform:uppercase}
.footer-contact p,.footer-contact a{margin:0;color:rgba(255,255,255,.72);font-size:.93rem;line-height:1.5}
.footer-contact a:hover{color:#fff}
.footer-cta{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:22px;align-items:center;
  margin-bottom:28px;padding:24px 26px;border:1px solid rgba(255,255,255,.14)}
.footer-cta strong,.footer-cta span{display:block}
.footer-cta strong{color:#fff;font-family:var(--serif);font-size:1.2rem;font-weight:300}
.footer-cta span{margin-top:5px;color:rgba(255,255,255,.62);font-size:.93rem}
.footer-bottom{display:flex;flex-direction:column;gap:8px;padding-top:26px;
  border-top:1px solid rgba(255,255,255,.14);color:rgba(255,255,255,.48);font-size:.85rem}
.footer-bottom a{color:rgba(255,255,255,.7)}

/* ---------- màn hình nhỏ ---------- */
@media(max-width:1080px){
  .product-grid,.grid-4{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-main{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:980px){
  .header-inner{flex-wrap:wrap;padding:14px 0;min-height:0}
  .brand{min-width:0}
  .nav{order:3;width:100%;gap:18px;overflow-x:auto;padding-bottom:4px;font-size:.9rem}
  .nav a,.nav-dropdown summary{padding:8px 0 12px}
  .nav a:after,.nav-dropdown summary:after{bottom:6px}
  .nav-dropdown-panel{top:calc(100% - 2px);left:0;width:300px;transform:none}
  .hero,.page-hero{background:
    linear-gradient(180deg,rgba(238,242,246,.94) 0 62%,rgba(238,242,246,.7) 100%),
    var(--hero-image,var(--page-image)) right bottom/auto 46% no-repeat,var(--surface)}
  .hero-copy{width:100%}
  .metrics,.grid-3,.grid-4,.product-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split,.contact-layout,.product-hero-grid,.grid-2{grid-template-columns:1fr}
  .insight-grid,.hub-grid{grid-template-columns:1fr}
  .footer-cta{grid-template-columns:1fr}
  .metric:first-child{padding-left:28px}
}
@media(max-width:640px){
  body{font-size:16px}
  .container,.header-inner,.footer-inner{width:min(100% - 32px,var(--container))}
  .brand-sub{display:none}
  .nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px 14px;overflow:visible;text-align:center}
  .nav a,.nav-dropdown summary{justify-content:center;padding:4px 0 8px;line-height:1.3;white-space:normal}
  .nav-dropdown-panel{left:50%;width:min(84vw,300px);text-align:left;transform:translateX(-50%)}
  .nav-cta{grid-column:1/-1;justify-content:center}
  .hero-inner,.page-hero-inner{padding:52px 0 48px}
  .section{padding:56px 0}
  .metrics,.grid-3,.grid-4,.product-grid,.form-grid{grid-template-columns:1fr}
  .metric{border-left:0;border-top:1px solid var(--line);padding-left:0}
  .metric:first-child{border-top:0;padding-left:0}
  .spec-row{grid-template-columns:1fr;gap:4px}
  .footer-main{grid-template-columns:1fr}
}

/* ==========================================================================
   HERO anh canh — nen sang phu lop trang mo dan de chu doc ro
   ========================================================================== */
.hero.hero-scene,.page-hero.hero-scene{border-bottom:1px solid var(--line)}
@media (min-width:981px){
  .hero.hero-scene,.page-hero.hero-scene,.home-hero.hero-scene{
    background:
      linear-gradient(90deg,
        #fff 0 38%,
        rgba(255,255,255,.72) 46%,
        rgba(255,255,255,.18) 54%,
        rgba(255,255,255,0) 62%),
      var(--hero-image,none) right center/auto 100% no-repeat,
      #fff;
  }
  .hero.hero-scene .hero-inner,.page-hero.hero-scene .page-hero-inner{min-height:396px}
  .home-hero.hero-scene .hero-inner{min-height:452px}
  .hero.hero-scene .hero-copy{width:min(660px,57%)}
  .hero.hero-scene h1{max-width:20ch}
  .page-hero.hero-scene .page-hero-inner > *{max-width:min(620px,57%)}
}
@media (max-width:980px){
  .hero.hero-scene,.page-hero.hero-scene,.home-hero.hero-scene{
    background:
      linear-gradient(180deg,
        #fff 0 42%,
        rgba(255,255,255,.82) 54%,
        rgba(255,255,255,.22) 68%,
        rgba(255,255,255,0) 80%),
      var(--hero-image-sm,var(--hero-image,none)) center bottom/contain no-repeat,
      #fff;
  }
  .hero.hero-scene .hero-inner,.page-hero.hero-scene .page-hero-inner,
  .home-hero.hero-scene .hero-inner{padding-bottom:calc(min(52vw,360px) + 22px)}
}

/* ---------- menu gon cho tablet/dien thoai (<=980px) ---------- */
@supports selector(:has(*)) {
 @media (max-width: 980px) {
  :root{--fg-bar:74px;--fg-btn:38px;--fg-menu-w:104px;
    --fg-accent:var(--blue);--fg-accent-soft:var(--blue-tint);--fg-border:var(--line)}
  .site-header .header-inner{position:relative;min-height:var(--fg-bar);padding-top:0;padding-bottom:0}
  .site-header .brand{min-width:0;max-width:calc(100% - var(--fg-menu-w) - 116px)}
  .site-header .brand > span{min-width:0}
  .site-header .brand-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .site-header .nav{position:absolute;top:0;right:0;width:auto;height:var(--fg-bar);display:flex;
    align-items:center;justify-content:flex-end;gap:12px;padding:0;overflow:visible;z-index:60}
  .site-header .nav > a:not(.nav-cta){display:none}
  .site-header .nav > .nav-cta{order:-1;min-height:var(--fg-btn)}
  .site-header .nav-dropdown{position:static}
  .site-header .nav-dropdown > summary{width:var(--fg-menu-w);height:var(--fg-btn);padding:0 12px 0 34px;
    display:inline-flex;align-items:center;gap:7px;border:1px solid var(--fg-border);border-radius:3px;
    background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23334' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M4 7h16M4 12h16M4 17h16'/%3E%3C/svg%3E") 11px center / 15px no-repeat;
    font-size:0;cursor:pointer;transition:border-color 160ms ease,background-color 160ms ease}
  .site-header .nav-dropdown > summary::after{content:"Menu";order:1;position:static;left:auto;right:auto;
    bottom:auto;width:auto;height:auto;background:none;transform:none;font-size:.92rem;font-weight:700;line-height:1}
  .site-header .nav-dropdown > summary::before{order:2;margin-left:auto}
  .site-header .nav-dropdown > summary:hover{border-color:var(--fg-accent)}
  .site-header .nav-dropdown[open] > summary{border-color:var(--fg-accent);background-color:var(--fg-accent-soft)}
  .site-header .nav:has(> .nav-dropdown[open]){height:auto;display:block;width:min(340px,calc(100vw - 28px));
    max-height:calc(100vh - 16px);overflow-y:auto;overscroll-behavior:contain;padding:var(--fg-bar) 0 8px;
    text-align:left;z-index:70}
  .site-header .nav:has(> .nav-dropdown[open])::before{content:"";position:absolute;left:0;right:0;
    top:calc(var(--fg-bar) - 8px);bottom:0;z-index:-1;border:1px solid var(--fg-border);border-radius:8px;
    background:#fff;box-shadow:0 22px 52px rgba(16,25,35,.18)}
  .site-header .nav:has(> .nav-dropdown[open]) > .nav-dropdown > summary,
  .site-header .nav:has(> .nav-dropdown[open]) > .nav-cta{position:absolute;
    top:calc((var(--fg-bar) - var(--fg-btn)) / 2)}
  .site-header .nav:has(> .nav-dropdown[open]) > .nav-dropdown > summary{right:0}
  .site-header .nav:has(> .nav-dropdown[open]) > .nav-cta{right:calc(var(--fg-menu-w) + 12px)}
  .site-header .nav:has(> .nav-dropdown[open]) > a:not(.nav-cta){display:block;margin:0 8px;padding:11px 12px;
    border-radius:6px;font-size:.95rem;font-weight:600;line-height:1.3;text-align:left;white-space:normal}
  .site-header .nav:has(> .nav-dropdown[open]) > a:not(.nav-cta)::after{content:none}
  .site-header .nav:has(> .nav-dropdown[open]) > a:not(.nav-cta):hover{color:var(--fg-accent);background:var(--fg-accent-soft)}
  .site-header .nav:has(> .nav-dropdown[open]) .nav-dropdown-panel{position:static;z-index:auto;width:auto;
    margin:4px 8px 6px;padding:4px 0 4px 10px;transform:none;border:0;border-left:2px solid var(--fg-border);
    border-radius:0;background:none;box-shadow:none;gap:0}
  .site-header .nav:has(> .nav-dropdown[open]) .nav-dropdown-panel::before{content:"Sản phẩm";display:block;
    padding:4px 12px 6px;color:var(--muted);font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}
  .site-header .nav:has(> .nav-dropdown[open]) .nav-dropdown-panel a{justify-content:flex-start;padding:9px 12px;
    font-size:.9rem;text-align:left}
  @media (max-width:640px){
    :root{--fg-menu-w:44px}
    .site-header .brand{max-width:calc(100% - var(--fg-menu-w) - 100px)}
    .site-header .brand-name{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;white-space:normal;
      overflow:hidden;font-size:.88rem;line-height:1.18}
    .site-header .brand-logo{height:18px}
    .site-header .nav-dropdown > summary{padding:0;gap:0;justify-content:center;background-position:center}
    .site-header .nav-dropdown > summary::after,.site-header .nav-dropdown > summary::before{content:none}
    .site-header .nav > .nav-cta{grid-column:auto;padding:0 12px !important;font-size:.86rem;white-space:nowrap}
    .site-header .nav:has(> .nav-dropdown[open]){width:calc(100vw - 28px)}
  }
 }
}


/* ==========================================================================
   Bổ sung riêng cho portal Siemens
   ========================================================================== */
:root{--t-plc:#00707a;--t-io:#0a7ea4;--t-hmi:#8a6d00;--t-drive:#c0521a;--t-switch:#5a3fa0;
  --t-power:#0f8a5f;--t-net:#004b8d;--t-instr:#a4262c}
.t-plc{--tone:var(--t-plc)} .t-io{--tone:var(--t-io)} .t-hmi{--tone:var(--t-hmi)}
.t-drive{--tone:var(--t-drive)} .t-switch{--tone:var(--t-switch)} .t-power{--tone:var(--t-power)}
.t-net{--tone:var(--t-net)} .t-instr{--tone:var(--t-instr)}
.brand-logo{height:24px;width:auto}
/* nhãn trạng thái vòng đời */
.lc{display:inline-block;padding:3px 9px;border:1px solid;font-size:.74rem;font-weight:600;
  line-height:1.4;letter-spacing:.01em;text-transform:none;white-space:nowrap;vertical-align:middle}
.lc-ok{color:#0b6b42;border-color:#a8d8c0;background:#eef9f3}
.lc-warn{color:#8a5200;border-color:#ecc98f;background:#fdf6e8}
.lc-stop{color:#a4262c;border-color:#eab4b6;background:#fcf0f0}
.lc-check{color:#4a4d50;border-color:#cfd1d3;background:#f4f4f5}
.product-body .lc{align-self:flex-start;margin-bottom:10px}
.product-card .product-media img{background:#fff}
.family-block{margin-top:56px}
.family-block:first-child{margin-top:0}
.family-block>h2{margin-bottom:6px}
.family-block>p{color:var(--muted);margin:0 0 20px}
.pill-links{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 30px}
.pill-links a{padding:8px 14px;border:1px solid var(--line);background:#fff;color:var(--ink);font-size:.9rem}
.pill-links a:hover{border-color:var(--blue);color:var(--blue)}
/* bảng thông số dài theo datasheet */
.spec-group{margin:0 0 2px;border:1px solid var(--line);background:#fff}
.spec-group>summary{padding:14px 18px;font-weight:600;cursor:pointer;list-style:none;color:var(--ink)}
.spec-group>summary::-webkit-details-marker{display:none}
.spec-group>summary:before{content:"+";display:inline-block;width:20px;color:var(--magenta)}
.spec-group[open]>summary:before{content:"–"}
.spec-group .md-table-wrap{margin:0;border:0;border-top:1px solid var(--line-soft)}
.spec-group .md-table td:first-child{width:46%;color:var(--muted)}
.spec-group .md-table tr.sub td{background:var(--surface-2);color:var(--ink);font-weight:600}
.spec-group .md-table tr.sub-item td:first-child{padding-left:30px}
.article-body .spec-table{margin:18px 0 26px}
.article-body .spec-row span,.article-body .spec-row strong{font-size:.95rem;line-height:1.5}
/* tra cứu mã */
.lookup-box{display:flex;gap:2px;max-width:760px;margin:0 auto 26px}
.lookup-box input{flex:1;min-width:0;height:54px;padding:0 18px;border:1px solid var(--line);
  font-size:1.05rem;outline:none;background:#fff}
.lookup-box input:focus{border-color:var(--blue)}
.lookup-count{text-align:center;color:var(--muted);font-size:.92rem;margin:0 0 18px}
.lookup-table td:first-child a{font-weight:700;color:var(--blue);white-space:nowrap}
.lookup-table td{font-size:.93rem}
.table-filter{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:0 0 20px}
.table-filter button{padding:8px 14px;border:1px solid var(--line);background:#fff;cursor:pointer;font:inherit;font-size:.88rem}
.table-filter button.on{border-color:var(--blue);color:#fff;background:var(--blue)}
.footer-bottom .tm-note{margin-top:6px;color:rgba(255,255,255,.55);font-size:.78rem;line-height:1.5}
@media(max-width:640px){.lookup-box{flex-direction:column}.lookup-box .button{width:100%}}
/* hero điện thoại: ảnh sản phẩm nằm gọn dưới phần chữ, không đè nút */
@media (max-width:980px){
  .hero.hero-scene,.page-hero.hero-scene,.home-hero.hero-scene{
    background:var(--hero-image-sm,var(--hero-image,none)) center bottom 14px/auto min(46vw,320px) no-repeat,#fff}
}