/* ============================================================
   RUIFENGDA Cooling Technology — English Corporate Website
   Pure Static: HTML + CSS + JS
   Responsive: 1920 / 1600 / 1440 / 1200 / Mobile
   ============================================================ */
:root{
  --navy:#0A2A5E;
  --navy-deep:#081F47;
  --blue:#1557C0;
  --blue-bright:#2D7BF4;
  --sky:#EAF2FC;
  --sky-2:#F5F9FF;
  --ink:#1B2A41;
  --gray:#5B6B82;
  --line:#DFE8F4;
  --orange:#FF8A00;
  --white:#fff;
  --radius:14px;
  --shadow:0 10px 30px rgba(10,42,94,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",Inter,Arial,Helvetica,sans-serif;color:var(--ink);background:var(--white);line-height:1.6;font-size:16px}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}

/* ---------- fluid container: 1920/1600/1440/1200 adaptive ---------- */
.container{width:min(1760px,92vw);margin:0 auto}

/* ============ TOP BAR ============ */
.topbar{background:var(--navy);color:#BBD0EE;font-size:15px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:40px}
.topbar a{color:#BBD0EE}
.topbar a:hover{color:#fff}
.topbar .left span{margin-right:24px}
.topbar .right span{margin-left:18px}

/* ============ HEADER ============ */
header.site{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:80px}
/* text-only wordmark (no icon) */
.logo{line-height:1}
.logo .name{font-size:26px;font-weight:800;letter-spacing:1px;color:var(--navy)}
.logo .name small{display:block;font-size:15px;font-weight:700;letter-spacing:2.5px;color:var(--blue);margin-top:3px}
nav.menu{display:flex;gap:36px;font-weight:600;font-size:15.5px;color:var(--ink)}
nav.menu a{padding:10px 0;border-bottom:3px solid transparent;transition:.2s}
nav.menu a:hover,nav.menu a.active{color:var(--blue);border-color:var(--blue)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:8px;font-weight:700;font-size:15.5px;transition:.25s;cursor:pointer;border:none}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--navy);transform:translateY(-2px);box-shadow:0 8px 20px rgba(21,87,192,.35)}
.btn-orange{background:var(--orange);color:#fff}
.btn-orange:hover{background:#E67A00;transform:translateY(-2px)}
.btn-ghost{border:2px solid #fff;color:#fff;background:transparent}
.btn-ghost:hover{background:#fff;color:var(--blue)}

/* ============ HERO ============ */
.hero{position:relative;height:78vh;min-height:640px;max-height:860px;overflow:hidden;background:var(--navy-deep)}
.slide{position:absolute;inset:0;opacity:0;transition:opacity .9s ease}
.slide.on{opacity:1}
.slide .media{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.55) saturate(.9)}
.slide video.media{object-fit:cover}
.slide::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(8,31,71,.88) 0%,rgba(10,42,94,.55) 45%,rgba(21,87,192,.28) 100%)}
.slide .container{position:relative;z-index:2;height:100%;display:flex;flex-direction:column;justify-content:center}
.hero .tag{display:inline-block;align-self:flex-start;background:rgba(45,123,244,.18);border:1px solid rgba(45,123,244,.5);color:#9CC4FF;font-size:15px;font-weight:700;letter-spacing:2px;padding:8px 18px;border-radius:99px;margin-bottom:24px;text-transform:uppercase}
.hero h1,.hero h2{color:#fff;font-size:clamp(34px,3.4vw,62px);line-height:1.14;font-weight:800;max-width:820px;margin-bottom:20px}
.hero h1 em{font-style:normal;color:#5EA8FF}
.hero p{color:#C4D6F2;font-size:clamp(16px,1.15vw,21px);max-width:680px;margin-bottom:34px}
.hero .cta{display:flex;gap:16px}
.dots{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:5}
.dots i{width:38px;height:5px;border-radius:3px;background:rgba(255,255,255,.3);cursor:pointer;transition:.3s}
.dots i.on{background:#fff}

/* ============ STATS ============ */
.stats{background:transparent;margin-top:-70px;position:relative;z-index:10}
.stats .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px 20px;text-align:center;box-shadow:var(--shadow)}
.stat b{font-size:44px;color:var(--blue);font-weight:800;line-height:1}
.stat b span{font-size:24px}
.stat p{margin-top:8px;color:var(--gray);font-weight:600;font-size:15px;letter-spacing:.3px}

/* ============ SECTION COMMON ============ */
section{padding:96px 0}
.sec-head{text-align:center;max-width:760px;margin:0 auto 56px}
.sec-head .kicker{display:inline-block;color:var(--blue);font-weight:800;letter-spacing:2.5px;font-size:15px;text-transform:uppercase;margin-bottom:12px}
.sec-head .kicker::after,.sec-head .kicker::before{content:"—";margin:0 10px;color:#B9CCE8}
.sec-head h2{font-size:clamp(27px,2.2vw,40px);font-weight:800;color:var(--navy);line-height:1.25}
.sec-head p{color:var(--gray);margin-top:14px;font-size:17.5px}
.light{background:var(--sky-2)}

/* ============ CATEGORIES ============ */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.cat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;position:relative}
.cat:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.cat .imgwrap{height:220px;overflow:hidden;background:#fff;display:flex;align-items:center;justify-content:center;padding:18px}
.cat .imgwrap img{max-height:184px;width:auto;max-width:88%;object-fit:contain;transition:.4s}
.cat:hover .imgwrap img{transform:scale(1.08)}
.cat .body{padding:22px 24px 24px;border-top:1px solid var(--line)}
.cat h3{font-size:18.5px;color:var(--navy);font-weight:800;margin-bottom:7px}
.cat p{font-size:15px;color:var(--gray);line-height:1.55}
.cat .more{display:inline-block;margin-top:13px;color:var(--blue);font-weight:700;font-size:15px}
.cat.custom{background:linear-gradient(135deg,#0A2A5E,#1557C0)}
.cat.custom .body{border-top:none}
.cat.custom h3{color:#fff}
.cat.custom p{color:#B9CFF2}
.cat.custom .more{color:#5EA8FF}

/* ============ FEATURED PRODUCTS ============ */
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.prod{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;display:flex;flex-direction:column}
.prod:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.prod .imgwrap{background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:center;height:230px;padding:18px}
.prod .imgwrap img{max-height:194px;width:auto;max-width:92%;object-fit:contain;transition:.35s}
.prod:hover .imgwrap img{transform:scale(1.07)}
.prod .body{padding:22px;flex:1;display:flex;flex-direction:column}
.prod .badge{align-self:flex-start;font-size:15px;font-weight:800;letter-spacing:1px;color:var(--blue);background:var(--sky);padding:4px 11px;border-radius:6px;margin-bottom:11px;text-transform:uppercase}
.prod h3{font-size:18px;color:var(--navy);font-weight:800;margin-bottom:4px}
.prod .desc{font-size:15px;color:var(--gray);margin-bottom:13px}
.specs{margin-top:auto;font-size:15px;color:var(--ink)}
.specs div{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px dashed var(--line)}
.specs b{color:var(--blue);font-weight:700}
.prod .links{display:flex;gap:10px;margin-top:15px}
.prod .links a{flex:1;text-align:center;padding:9px 0;border-radius:7px;font-size:15px;font-weight:700}
.prod .links a.a1{background:var(--blue);color:#fff}
.prod .links a.a1:hover{background:var(--navy)}
.prod .links a.a2{border:1.5px solid var(--line);color:var(--gray)}
.prod .links a.a2:hover{border-color:var(--blue);color:var(--blue)}

/* ============ WHY US ============ */
.why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.why{display:flex;gap:22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;transition:.3s}
.why:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.why .ic{width:60px;height:60px;flex-shrink:0;border-radius:14px;background:linear-gradient(135deg,var(--blue),var(--blue-bright));display:flex;align-items:center;justify-content:center}
.why .ic svg{width:29px;height:29px}
.why h3{font-size:18px;color:var(--navy);font-weight:800;margin-bottom:7px}
.why p{font-size:15px;color:var(--gray)}
.cert-row{margin-top:36px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.cert{display:flex;align-items:center;gap:10px;background:#fff;border:1.5px solid var(--line);border-radius:99px;padding:11px 24px;font-weight:800;color:var(--navy);font-size:15px}
.cert svg{width:20px;height:20px}

/* ============ APPLICATIONS ============ */
.app-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.app{position:relative;border-radius:var(--radius);overflow:hidden;height:250px;display:block}
.app img{width:100%;height:100%;object-fit:cover;transition:.5s}
.app:hover img{transform:scale(1.08)}
.app .ov{position:absolute;inset:0;background:linear-gradient(to top,rgba(8,31,71,.92) 0%,rgba(8,31,71,.25) 55%,transparent 100%);display:flex;flex-direction:column;justify-content:flex-end;padding:22px}
.app .ov h3{color:#fff;font-size:17.5px;font-weight:800}
.app .ov span{color:#9CC4FF;font-size:15px;font-weight:600}
.app .ov::before{content:"";position:absolute;inset:0;border:2px solid transparent;border-radius:var(--radius);transition:.3s}
.app:hover .ov::before{border-color:rgba(94,168,255,.7)}

/* ============ ABOUT ============ */
.about{display:grid;grid-template-columns:1.05fr 1fr;gap:64px;align-items:center}
.about .imgs{position:relative}
.about .imgs .main{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;height:440px;object-fit:cover}
.about .imgs .sub{position:absolute;left:-24px;bottom:-32px;width:44%;height:210px;object-fit:cover;border-radius:var(--radius);border:6px solid #fff;box-shadow:var(--shadow)}
.about .exp{position:absolute;right:-14px;bottom:-20px;background:var(--blue);color:#fff;border-radius:var(--radius);padding:24px 28px;box-shadow:var(--shadow)}
.about .exp b{font-size:36px;font-weight:800;display:block;line-height:1}
.about .exp p{font-size:15px;letter-spacing:1px;font-weight:600;margin-top:4px;color:#fff}
.about .kicker{display:inline-block;color:var(--blue);font-weight:800;letter-spacing:2.5px;font-size:15px;text-transform:uppercase;margin-bottom:12px}
.about h2{font-size:clamp(26px,2vw,36px);font-weight:800;color:var(--navy);margin-bottom:18px;line-height:1.3}
.about p{color:var(--gray);font-size:15.5px;margin-bottom:14px}
.about p b{color:var(--blue)}

/* ============ EQUIPMENT GALLERY ============ */
.eq-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.eq{position:relative;border-radius:var(--radius);overflow:hidden;height:250px;background:var(--sky)}
.eq img{width:100%;height:100%;object-fit:cover;transition:.5s}
.eq:hover img{transform:scale(1.07)}
.eq .cap{position:absolute;inset:auto 0 0 0;padding:38px 18px 14px;background:linear-gradient(to top,rgba(8,31,71,.92),transparent);color:#fff;font-weight:800;font-size:15.5px}
.eq .cap small{display:block;font-weight:600;font-size:15px;color:#9CC4FF;margin-top:2px}

/* ============ NEWS ============ */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s}
.news:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.news .thumb{height:210px;overflow:hidden}
.news .thumb img{width:100%;height:100%;object-fit:cover;transition:.5s}
.news:hover .thumb img{transform:scale(1.06)}
.news .body{padding:24px}
.news .meta{font-size:15px;color:#8CA0BC;font-weight:600;display:flex;gap:14px;margin-bottom:10px}
.news h3{font-size:17px;color:var(--navy);font-weight:800;line-height:1.45;margin-bottom:10px}
.news p{font-size:15px;color:var(--gray);margin-bottom:14px}
.news .more{color:var(--blue);font-weight:700;font-size:15px}

/* ============ CTA ============ */
.cta-band{background:linear-gradient(100deg,#081F47,#1557C0);border-radius:20px;padding:56px 64px;display:flex;align-items:center;justify-content:space-between;gap:30px;position:relative;overflow:hidden}
.cta-band::after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;background:radial-gradient(circle,rgba(45,123,244,.5),transparent 70%)}
.cta-band h2{color:#fff;font-size:31px;font-weight:800;margin-bottom:8px}
.cta-band p{color:#B9CFF2;font-size:16.5px}
.cta-band .btn{flex-shrink:0}

/* ============ CONTACT ============ */
.contact{display:grid;grid-template-columns:1fr 1.15fr;gap:56px}
.c-info h2{font-size:33px;color:var(--navy);font-weight:800;margin-bottom:14px}
.c-info>p{color:var(--gray);margin-bottom:26px}
.c-item{display:flex;gap:16px;padding:17px 0;border-bottom:1px solid var(--line)}
.c-item .ic{width:48px;height:48px;border-radius:12px;background:var(--sky);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.c-item .ic svg{width:23px;height:23px}
.c-item b{display:block;font-size:15.5px;color:var(--navy)}
.c-item span{font-size:15px;color:var(--gray)}
form.inquiry{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
form.inquiry h3{color:var(--navy);font-size:21px;font-weight:800;margin-bottom:22px}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
form.inquiry input,form.inquiry textarea{width:100%;border:1.5px solid var(--line);border-radius:9px;padding:13px 15px;font-size:15px;font-family:inherit;color:var(--ink);outline:none;transition:.2s;background:var(--sky-2)}
form.inquiry input:focus,form.inquiry textarea:focus{border-color:var(--blue);background:#fff}
form.inquiry textarea{height:124px;resize:vertical;margin-bottom:16px}
form.inquiry .btn{width:100%;justify-content:center}

/* ============ FOOTER ============ */
footer{background:var(--navy);color:#9DB4D6;padding:68px 0 0;font-size:15px}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:48px;padding-bottom:46px}
footer h4{color:#fff;font-size:16.5px;font-weight:800;margin-bottom:18px;letter-spacing:.5px}
footer .about-txt{line-height:1.75;margin-top:16px}
footer li{margin-bottom:10px}
footer a:hover{color:#fff}
footer .flogo b{color:#fff;font-size:22px;letter-spacing:1px}
footer .flogo small{display:block;font-size:15px;letter-spacing:2px;color:#5EA8FF;font-weight:700}
.copyright{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;text-align:center;font-size:15px;color:#7A93BB}

/* ============ FLOATING CONTACT ============ */
.float-bar{position:fixed;right:24px;bottom:28px;display:flex;flex-direction:column;gap:10px;z-index:99}
.float-bar a{width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 22px rgba(10,42,94,.3);transition:.25s}
.float-bar a:hover{transform:translateY(-3px)}
.float-bar .tel{background:var(--blue)}
.float-bar .mail{background:var(--orange)}
.float-bar svg{width:25px;height:25px}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */
/* ≥1920 : full-width feel, larger hero text handled by clamp */
@media (min-width:1920px){
  body{font-size:17px}
}
/* 1440–1679 */
@media (max-width:1679px){
  .cat-grid,.prod-grid,.app-grid,.eq-grid{gap:20px}
}
/* 1200–1439 : tighten nav gaps */
@media (max-width:1439px){
  nav.menu{gap:24px}
  .about{gap:44px}
  .about .imgs .main{height:380px}
}
/* ≤1199 : tablet */
@media (max-width:1199px){
  nav.menu{display:none}
  .cat-grid,.prod-grid,.app-grid,.eq-grid{grid-template-columns:repeat(3,1fr)}
  .about,.contact{grid-template-columns:1fr}
  .about .imgs{max-width:640px;margin-bottom:26px}
  .stats .grid{grid-template-columns:repeat(4,1fr)}
  .cta-band h2{font-size:26px}
}
/* ≤860 : small tablet */
@media (max-width:860px){
  .cat-grid,.prod-grid,.app-grid,.eq-grid,.news-grid{grid-template-columns:repeat(2,1fr)}
  .why-grid{grid-template-columns:1fr}
  .stats .grid{grid-template-columns:repeat(2,1fr)}
  .footer .cols{grid-template-columns:1fr 1fr}
}
/* ≤600 : mobile */
@media (max-width:600px){
  .hero{min-height:560px;height:72vh}
  .hero .cta{flex-direction:column;align-items:flex-start}
  .cat-grid,.prod-grid,.app-grid,.eq-grid,.news-grid,.frow{grid-template-columns:1fr}
  .cta-band{flex-direction:column;text-align:center;padding:42px 26px}
  section{padding:64px 0}
  .topbar .left span:nth-child(2){display:none}
  .about .imgs .sub{display:none}
  .about .imgs .main{height:280px}
  footer .cols{grid-template-columns:1fr}
}

/* ============================================================
   INNER PAGES (About / Contact)
   ============================================================ */
/* page banner */
.page-banner{position:relative;height:340px;display:flex;align-items:center;overflow:hidden;background:var(--navy-deep)}
.page-banner img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.4) saturate(.9)}
.page-banner .container{position:relative;z-index:2}
.page-banner .crumb{color:#9CC4FF;font-size:15px;font-weight:600;margin-bottom:10px}
.page-banner .crumb a{color:#9CC4FF}
.page-banner .crumb a:hover{color:#fff}
.page-banner h1,.page-banner .pb-title{color:#fff;font-size:clamp(30px,2.6vw,46px);font-weight:800;letter-spacing:.5px}
.page-banner p{color:#C4D6F2;font-size:17px;margin-top:10px;max-width:700px}

/* about page */
.intro{display:grid;grid-template-columns:1.1fr 1fr;gap:60px;align-items:center}
.intro .imgs{position:relative}
.intro .imgs .main{width:100%;height:460px;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow)}
.intro .imgs .sub{position:absolute;left:-24px;bottom:-32px;width:46%;height:220px;object-fit:cover;border-radius:var(--radius);border:6px solid #fff;box-shadow:var(--shadow)}
.intro .exp{position:absolute;right:-14px;top:-20px;background:var(--blue);color:#fff;border-radius:var(--radius);padding:24px 28px;box-shadow:var(--shadow)}
.intro .exp b{font-size:36px;font-weight:800;display:block;line-height:1}
.intro .exp p{font-size:15px;letter-spacing:1px;font-weight:600;margin-top:4px;color:#fff}
.intro .kicker{display:inline-block;color:var(--blue);font-weight:800;letter-spacing:2.5px;font-size:15px;text-transform:uppercase;margin-bottom:12px}
.intro h2{font-size:clamp(26px,2vw,36px);font-weight:800;color:var(--navy);margin-bottom:18px;line-height:1.3}
.intro p{color:var(--gray);font-size:15.5px;margin-bottom:14px}
.intro p b{color:var(--blue)}
.value-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:10px}
.value{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;transition:.3s}
.value:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.value .ic{width:58px;height:58px;border-radius:14px;background:var(--sky);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.value .ic svg{width:28px;height:28px}
.value h3{font-size:18px;color:var(--navy);font-weight:800;margin-bottom:8px}
.value p{font-size:15px;color:var(--gray);margin:0}
.milestone{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:ms}
.mile{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;position:relative}
.mile b{display:block;font-size:26px;color:var(--blue);font-weight:800;margin-bottom:8px}
.mile h4{font-size:16.5px;color:var(--navy);font-weight:800;margin-bottom:6px}
.mile p{font-size:15px;color:var(--gray);margin:0}
/* certifications */
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.cert-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s}
.cert-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.cert-card .ph{height:250px;background:#fff;display:flex;align-items:center;justify-content:center;padding:20px;border-bottom:1px solid var(--line)}
.cert-card .ph img{max-height:210px;max-width:90%;object-fit:contain}
.cert-card .body{padding:18px 20px}
.cert-card .body b{display:block;font-size:16.5px;color:var(--navy);font-weight:800}
.cert-card .body span{font-size:15px;color:var(--gray)}

/* contact page */
.c-channels{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.chan{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;text-align:center;transition:.3s}
.chan:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.chan .ic{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--blue-bright));display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.chan .ic svg{width:30px;height:30px}
.chan h3{font-size:17.5px;color:var(--navy);font-weight:800;margin-bottom:6px}
.chan p{font-size:15px;color:var(--gray);margin-bottom:4px;word-break:break-all}
.chan .go{display:inline-block;margin-top:12px;color:var(--blue);font-weight:700;font-size:15px}
.map-wrap{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);height:420px}
.map-wrap iframe{width:100%;height:100%;border:0;display:block}
.contact-page{display:grid;grid-template-columns:1fr 1.15fr;gap:56px}
@media (max-width:1199px){
  .intro,.contact-page{grid-template-columns:1fr}
  .value-grid{grid-template-columns:1fr 1fr}
  .milestone{grid-template-columns:1fr 1fr}
  .cert-grid,.c-channels{grid-template-columns:1fr 1fr}
  .intro .imgs{max-width:640px;margin-bottom:30px}
}
@media (max-width:600px){
  .value-grid,.milestone,.cert-grid,.c-channels{grid-template-columns:1fr}
  .page-banner{height:260px}
  .intro .imgs .sub{display:none}
  .intro .imgs .main{height:300px}
  .map-wrap{height:300px}
}
header.site.scrolled{box-shadow:0 4px 18px rgba(10,42,94,.08)}

/* ============================================================
   APPLICATIONS PAGE / OEM PAGE / NEWS
   ============================================================ */
/* industry rows (alternating) */
.ind-row{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;padding:54px 0;border-bottom:1px solid var(--line)}
.ind-row:last-child{border-bottom:none}
.ind-row:nth-child(even) .ind-txt{order:2}
.ind-row .ind-img{height:380px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.ind-row .ind-img img{width:100%;height:100%;object-fit:cover;transition:.6s}
.ind-row:hover .ind-img img{transform:scale(1.05)}
.ind-txt .no{color:#C6D8F0;font-size:44px;font-weight:800;line-height:1;margin-bottom:6px}
.ind-txt h3{font-size:24px;color:var(--navy);font-weight:800;margin-bottom:12px}
.ind-txt p{color:var(--gray);font-size:15.5px;margin-bottom:18px}
.ind-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px}
.ind-tags span{background:var(--sky);color:var(--blue);font-weight:700;font-size:15px;padding:6px 14px;border-radius:99px}
.ind-spec{width:100%;border-collapse:collapse;font-size:15px}
.ind-spec th{text-align:left;color:var(--navy);background:var(--sky-2);padding:10px 14px;border:1px solid var(--line);font-weight:800}
.ind-spec td{padding:10px 14px;border:1px solid var(--line);color:var(--gray)}

/* process steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:step}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px;position:relative;transition:.3s}
.step:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.step .n{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--blue-bright));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-size:16px}
.step h3{font-size:17.5px;color:var(--navy);font-weight:800;margin-bottom:8px}
.step p{font-size:15px;color:var(--gray);margin:0}

/* news list */
.news-hero-list{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.post{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;display:flex;flex-direction:column}
.post:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.post .thumb{height:220px;overflow:hidden}
.post .thumb img{width:100%;height:100%;object-fit:cover;transition:.5s}
.post:hover .thumb img{transform:scale(1.06)}
.post .body{padding:24px;flex:1;display:flex;flex-direction:column}
.post .tagline{display:flex;gap:12px;font-size:15px;color:#8CA0BC;font-weight:600;margin-bottom:10px}
.post .tagline b{color:var(--blue)}
.post h3{font-size:18px;color:var(--navy);font-weight:800;line-height:1.45;margin-bottom:10px}
.post p{font-size:15px;color:var(--gray);margin-bottom:16px}
.post .rm{margin-top:auto;color:var(--blue);font-weight:700;font-size:15px}
/* text-only news cards (no thumbnail) */
.post.no-thumb{border-top:4px solid var(--blue)}
.post.no-thumb .tagline{margin-top:20px}
.post.no-thumb h3{font-size:19px}

/* article page — 内容区宽度与全站容器一致，流式适配各分辨率 */
.article-head{background:var(--sky-2);padding:56px 0 40px;border-bottom:1px solid var(--line)}
.article-head .crumb{color:var(--gray);font-size:15px;font-weight:600;margin-bottom:14px}
.article-head .crumb a{color:var(--blue)}
.article-head h1{font-size:clamp(26px,2.4vw,40px);color:var(--navy);font-weight:800;line-height:1.3;margin-bottom:16px}
.article-head .meta{display:flex;flex-wrap:wrap;gap:18px;color:#8CA0BC;font-size:15px;font-weight:600}
.article-head .meta b{color:var(--blue)}
.article-body{margin:0 auto;padding:52px 0 20px}
/* 大屏下正文行宽过长，字号随宽度微调提升可读性 */
@media (min-width:1680px){
  .article-body p,.article-body li{font-size:17.5px}
  .article-body .lead{font-size:20px}
  .article-body h2{font-size:26px}
}
.article-body .lead{font-size:19px;color:var(--navy);font-weight:600;line-height:1.7;margin-bottom:26px;padding-left:20px;border-left:4px solid var(--blue)}
.article-body h2{font-size:24px;color:var(--navy);font-weight:800;margin:36px 0 14px;line-height:1.35}
.article-body h3{font-size:19px;color:var(--navy);font-weight:800;margin:26px 0 10px}
.article-body p{font-size:16.5px;color:#33445C;line-height:1.85;margin-bottom:16px}
.article-body ul,.article-body ol{margin:0 0 20px 22px}
.article-body li{font-size:16.5px;color:#33445C;line-height:1.8;margin-bottom:8px}
.article-body table{width:100%;border-collapse:collapse;margin:20px 0 26px;font-size:15.5px}
.article-body th{background:var(--navy);color:#fff;text-align:left;padding:12px 14px;font-weight:700}
.article-body td{padding:11px 14px;border-bottom:1px solid var(--line);color:#33445C}
.article-body tr:nth-child(even) td{background:var(--sky-2)}
.article-body .note{background:var(--sky);border-radius:var(--radius);padding:22px 26px;margin:26px 0;font-size:15.5px;color:var(--navy)}
.article-body .note b{display:block;margin-bottom:6px}
.article-cta{background:linear-gradient(100deg,#081F47,#1557C0);border-radius:var(--radius);padding:36px 40px;margin:40px 0;display:flex;align-items:center;justify-content:space-between;gap:24px}
.article-cta h3{color:#fff;font-size:21px;font-weight:800;margin-bottom:6px}
.article-cta p{color:#B9CFF2;font-size:15.5px;margin:0}
.article-cta .btn{flex-shrink:0}
.back-link{display:inline-block;margin:10px 0 60px;color:var(--blue);font-weight:700;font-size:15.5px}
@media (max-width:1199px){
  .ind-row,.steps,.news-hero-list{grid-template-columns:1fr}
  .ind-row:nth-child(even) .ind-txt{order:0}
  .ind-row .ind-img{height:300px;margin-bottom:24px}
  .article-cta{flex-direction:column;align-items:flex-start}
}
@media (max-width:860px){
  .steps,.news-hero-list{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  .steps,.news-hero-list{grid-template-columns:1fr}
  .article-body{padding:32px 0 10px}
}

/* ============================================================
   NAV DROPDOWN (Products) — hover to open, leave to close
   ============================================================ */
.nav-drop{position:relative}
nav.menu .nav-drop>a{display:flex;align-items:center;gap:5px;padding:10px 0;border-bottom:3px solid transparent;transition:.2s}
nav.menu .nav-drop>a:hover{color:var(--blue);border-color:var(--blue)}
.nav-drop>a svg{width:10px;height:6px;fill:currentColor;transition:.25s;margin-top:1px}
.nav-drop:hover>a svg{transform:rotate(180deg)}
.drop{position:absolute;top:100%;left:50%;transform:translate(-50%,12px);width:264px;background:#fff;border-radius:12px;box-shadow:0 18px 44px rgba(10,42,94,.2);padding:10px 0;opacity:0;visibility:hidden;transition:opacity .22s,transform .22s,visibility .22s;z-index:80}
/* invisible bridge so hover survives the gap between link and panel */
.drop::before{content:"";position:absolute;top:-14px;left:0;right:0;height:14px}
.nav-drop:hover .drop{opacity:1;visibility:visible;transform:translate(-50%,4px)}
nav.menu .drop a{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 20px;border-bottom:1px solid var(--sky-2);color:var(--navy);font-size:15px;font-weight:600}
nav.menu .drop a:hover{color:var(--blue);background:var(--sky)}
.drop a b{font-size:15px;color:#8CA0BC;font-weight:700}
nav.menu .drop a.all{justify-content:center;background:var(--navy);color:#fff;font-weight:800;margin:8px 12px 2px;border-radius:8px;padding:11px 20px;border-bottom:none}
nav.menu .drop a.all:hover{background:var(--blue);color:#fff}

/* ============================================================
   PRODUCTS OVERVIEW PAGE
   ============================================================ */
.p-anchor{position:sticky;top:80px;z-index:50;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 2px 10px rgba(10,42,94,.05)}
.p-anchor .container{display:flex;flex-wrap:wrap;gap:10px;padding:12px 0}
.p-anchor a{display:flex;align-items:center;gap:7px;padding:7px 16px;border-radius:99px;border:1.5px solid var(--line);color:var(--gray);font-weight:700;font-size:15px;transition:.2s}
.p-anchor a:hover{background:var(--blue);border-color:var(--blue);color:#fff}
.p-anchor a b{font-size:15px;color:#8CA0BC;font-weight:800}
.p-anchor a:hover b{color:#fff}
.p-sec{padding:64px 0}
.p-sec.alt{background:var(--sky-2)}
.p-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:32px}
.p-head h2{font-size:clamp(24px,1.9vw,34px);font-weight:800;color:var(--navy);margin-bottom:8px}
.p-head h2 span{margin-left:10px;color:#8CA0BC;font-size:17px;font-weight:700}
.p-head p{max-width:680px;color:var(--gray);font-size:15.5px;line-height:1.6}
.p-head .btn{flex-shrink:0}
@media (max-width:860px){
  .p-head{flex-direction:column;align-items:flex-start}
  .p-anchor{top:60px}
  .p-anchor a b{display:none}
}

/* ============================================================
   PRODUCT DETAIL PAGE
   ============================================================ */
.pd-wrap{display:grid;grid-template-columns:1.05fr 1fr;gap:52px;align-items:flex-start;padding:56px 0 6px}
.pd-gallery{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:44px;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow)}
.pd-gallery img{max-width:100%;max-height:440px;object-fit:contain}
.pd-info .badge{display:inline-block;font-size:15px;font-weight:800;letter-spacing:1px;color:var(--blue);background:var(--sky);padding:4px 12px;border-radius:6px;text-transform:uppercase}
.pd-info h1{font-size:clamp(26px,2.2vw,38px);color:var(--navy);font-weight:800;margin:12px 0 14px;line-height:1.2}
.pd-info .sub{color:var(--gray);font-size:16px;line-height:1.75;margin-bottom:24px}
.pd-quick{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:26px}
.pd-quick div{background:var(--sky-2);border-radius:10px;padding:14px 18px}
.pd-quick span{display:block;font-size:15px;color:#8CA0BC;font-weight:700;margin-bottom:2px}
.pd-quick b{font-size:16.5px;color:var(--navy)}
.pd-actions{display:flex;gap:12px;flex-wrap:wrap}
.pd-actions .btn{padding:14px 30px;font-size:15.5px}
.pd-cols{display:grid;grid-template-columns:1.15fr 1fr;gap:52px;padding:44px 0 8px;align-items:start}
.pd-cols h2{font-size:22px;color:var(--navy);font-weight:800;margin-bottom:16px}
.pd-cols p{color:#33445C;font-size:15.5px;line-height:1.8;margin-bottom:14px}
.spec-table{width:100%;border-collapse:collapse;margin-bottom:14px}
.spec-table th{width:40%;text-align:left;background:var(--sky-2);padding:11px 16px;border:1px solid var(--line);color:var(--navy);font-weight:800;font-size:15.5px}
.spec-table td{padding:11px 16px;border:1px solid var(--line);color:#33445C;font-size:15.5px}
.pd-note{background:var(--sky);border-radius:10px;padding:16px 20px;font-size:15px;color:var(--navy);line-height:1.6}
.feat{list-style:none;margin:0 0 8px;padding:0}
.feat li{position:relative;padding:0 0 10px 26px;color:#33445C;font-size:15.5px;line-height:1.65}
.feat li::before{content:"";position:absolute;left:0;top:7px;width:12px;height:12px;border-radius:50%;background:var(--blue);opacity:.85}
.app-chips{display:flex;flex-wrap:wrap;gap:10px;margin:6px 0 18px}
.app-chips span{background:var(--sky);color:var(--blue);font-weight:700;font-size:15px;padding:7px 15px;border-radius:99px}
.pd-rel{padding:56px 0 10px}
.pd-rel h2{font-size:24px;color:var(--navy);font-weight:800;margin-bottom:24px}
/* product FAQ */
.pd-faq .faq-list{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.pd-faq .faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 24px;transition:.25s}
.pd-faq .faq-item:hover{box-shadow:var(--shadow);border-color:transparent}
.pd-faq .faq-item h3{font-size:16.5px;color:var(--navy);font-weight:800;margin-bottom:8px;line-height:1.45}
.pd-faq .faq-item p{color:var(--gray);font-size:15.5px;line-height:1.75;margin:0}
@media (max-width:860px){.pd-faq .faq-list{grid-template-columns:1fr}}
@media (max-width:1199px){
  .pd-wrap,.pd-cols{grid-template-columns:1fr;gap:32px}
  .pd-gallery{padding:28px}
}