:root{
    --bg:#ffffff; --bg-soft:#f4f7f9; --surface:#ffffff; --ink:#1c2b39; --muted:#5b6d7d;
    --line:#dde5ec; --brand:#0e4d7a; --brand-deep:#0a3a5e; --brand-ink:#ffffff;
    --accent:#c98a2d; --accent-ink:#ffffff; --chip:#e8f1f8; --ok:#177245; --err:#b3261e;
    --shadow:0 10px 30px rgba(14,60,95,.10); --radius:12px;
  }
  @media (prefers-color-scheme: dark){
    :root{
      --bg:#10181f; --bg-soft:#16222c; --surface:#18242f; --ink:#e8eff5; --muted:#a3b4c2;
      --line:#2b3d4c; --brand:#3d8bc2; --brand-deep:#0d2c44; --chip:#1d3345;
      --shadow:0 10px 30px rgba(0,0,0,.35);
    }
  }
  *{box-sizing:border-box}
  body{margin:0;background:var(--bg);color:var(--ink);
    font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
    line-height:1.6;-webkit-font-smoothing:antialiased}
  img{max-width:100%;display:block}
  a{color:var(--brand);text-decoration:none}
  .wrap{max-width:1140px;margin:0 auto;padding:0 20px}
  .preview-bar{background:var(--brand-deep);color:#dcecf7;font-size:13px;text-align:center;padding:7px 16px}
  .preview-bar strong{color:#fff}

  /* header */
  header.site{position:sticky;top:0;z-index:50;background:var(--surface);border-bottom:1px solid var(--line)}
  .nav{display:flex;align-items:center;gap:24px;height:66px}
  .logo{font-size:21px;font-weight:800;letter-spacing:.04em;color:var(--ink);white-space:nowrap;cursor:pointer}
  .logo span{color:var(--brand)}
  .logo small{display:block;font-size:10.5px;font-weight:500;color:var(--muted);letter-spacing:.26em;line-height:1.2}
  nav.main{display:flex;gap:22px;margin-left:auto}
  nav.main a{color:var(--ink);font-size:15px;font-weight:500;padding:6px 2px;cursor:pointer;border-bottom:2px solid transparent}
  nav.main a:hover{color:var(--brand)}
  nav.main a.active{color:var(--brand);border-bottom-color:var(--brand)}
  .lang{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;flex:none}
  .lang button{background:none;border:0;padding:6px 13px;font:inherit;font-size:13.5px;font-weight:600;
    color:var(--muted);cursor:pointer}
  .lang button.on{background:var(--brand);color:#fff}
  .nav-tel{font-weight:700;color:var(--brand);white-space:nowrap;font-size:15px}
  .burger{display:none;background:none;border:1px solid var(--line);border-radius:8px;
    width:42px;height:42px;font-size:20px;color:var(--ink);cursor:pointer}

  /* pages — each view stands alone */
  .page{display:none}
  .page.active{display:block}
  section{padding:60px 0}
  section.soft{background:var(--bg-soft)}
  .sec-head{max-width:640px;margin:0 0 36px}
  .sec-head.center{text-align:center;margin-left:auto;margin-right:auto}
  .sec-head h2{font-size:29px;margin:0 0 8px;font-weight:800}
  .sec-head p{margin:0;color:var(--muted);font-size:16px}

  .btn{display:inline-block;background:var(--accent);color:var(--accent-ink);font-weight:700;
    padding:12px 28px;border-radius:8px;font-size:16px;border:0;cursor:pointer}
  .btn:hover{filter:brightness(1.07)}
  .btn.ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.55);margin-left:10px}

  /* home carousel */
  .carousel{position:relative;background:var(--brand-deep);overflow:hidden}
  .car-track{position:relative;height:480px}
  .car-slide{position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .7s ease,visibility 0s linear .7s}
  .car-slide.on{opacity:1;visibility:visible;transition:opacity .7s ease}
  .car-slide>img{width:100%;height:100%;object-fit:cover}
  .car-slide::after{content:"";position:absolute;inset:0;
    background:linear-gradient(90deg,rgba(7,33,54,.74),rgba(7,33,54,.30) 55%,rgba(7,33,54,.08))}
  .car-cap{position:absolute;inset:0;z-index:2;display:flex;align-items:center}
  .car-cap .wrap{width:100%}
  .car-cap h1,.car-cap h2{font-size:38px;line-height:1.25;margin:0 0 10px;color:#fff;font-weight:800;max-width:17em}
  .car-cap p{font-size:17px;margin:0 0 24px;color:#cfe3f2;max-width:32em}
  .car-nav{position:absolute;top:50%;transform:translateY(-50%);z-index:3;width:42px;height:42px;border-radius:50%;
    border:1px solid rgba(255,255,255,.55);background:rgba(7,33,54,.35);color:#fff;font-size:22px;line-height:1;cursor:pointer}
  .car-nav:hover{background:rgba(7,33,54,.6)}
  .car-prev{left:18px}.car-next{right:18px}
  .car-dots{position:absolute;left:0;right:0;bottom:18px;z-index:3;display:flex;justify-content:center;gap:8px}
  .car-dots button{width:28px;height:4px;border:0;border-radius:2px;background:rgba(255,255,255,.45);cursor:pointer;padding:0}
  .car-dots button.on{background:#fff}

  /* inner page banners */
  .banner{position:relative;height:300px;overflow:hidden;background:var(--brand-deep)}
  .banner.short{height:200px}
  .banner>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
  .banner::after{content:"";position:absolute;inset:0;
    background:linear-gradient(90deg,rgba(7,33,54,.68),rgba(7,33,54,.22))}
  .banner .wrap{position:relative;z-index:2;height:100%;display:flex;flex-direction:column;justify-content:center}
  .banner h1{color:#fff;font-size:34px;margin:0 0 6px;font-weight:800}
  .banner p{color:#cfe3f2;margin:0;font-size:16px}

  /* cards */
  .grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
  .card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
    display:flex;flex-direction:column}
  .card img{width:100%;height:185px;object-fit:cover}
  .card .body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
  .card h3{margin:0;font-size:18px}
  .card p{margin:0;color:var(--muted);font-size:14.5px;flex:1}
  .specs{display:flex;flex-wrap:wrap;gap:6px}
  .specs span{background:var(--chip);color:var(--brand);font-size:12.5px;border-radius:6px;padding:2px 9px;font-weight:600}
  @media (prefers-color-scheme: dark){.specs span{color:#9cc8e8}}
  .card .more{font-weight:700;font-size:15px;cursor:pointer;background:none;border:0;color:var(--brand);
    text-align:left;padding:0;font-family:inherit}
  .card .more:hover{text-decoration:underline}
  .card-link{cursor:pointer}
  .card-link:hover h3{color:var(--brand)}

  /* strengths strip on home */
  .points{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
  .points div{font-size:15px;font-weight:600;background:var(--surface);border:1px solid var(--line);
    border-radius:var(--radius);padding:16px}
  .points div::before{content:"✓ ";color:var(--ok);font-weight:800}

  /* about */
  .about{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
  .about h2{font-size:29px;margin:0 0 16px}
  .about p{color:var(--muted);margin:0 0 14px;font-size:16px}
  .about figure{margin:0;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
  .about figure img{width:100%;height:320px;object-fit:cover}

  /* certifications */
  .grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
  .cert{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
    padding:26px 18px;text-align:center}
  .cert .mark{width:56px;height:56px;margin:0 auto 12px;border-radius:50%;background:var(--chip);
    color:var(--brand);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px}
  .cert h4{margin:0 0 4px;font-size:17px}
  .cert p{margin:0;color:var(--muted);font-size:14px}
  .fineprint{color:var(--muted);font-size:13px;margin-top:18px}

  /* news */
  .news-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
  .news-card time{color:var(--brand);font-size:13.5px;font-weight:700}
  .news-card h3{margin:8px 0;font-size:18px;line-height:1.45}
  .news-card p{margin:0;color:var(--muted);font-size:14.5px}
  .news-card{cursor:pointer}
  .news-card:hover h3{color:var(--brand)}
  .news-tag{display:inline-block;background:var(--chip);color:var(--brand);font-size:12px;font-weight:700;
    border-radius:6px;padding:2px 9px;margin-bottom:8px}
  @media (prefers-color-scheme: dark){.news-tag{color:#9cc8e8}}
  .read-more{color:var(--brand);font-weight:700;font-size:14px;margin-top:10px;display:block}

  /* product & article detail views */
  #productGrid .card{cursor:pointer}
  .back-btn{background:none;border:1px solid var(--line);border-radius:8px;padding:9px 18px;font:inherit;
    font-weight:600;color:var(--brand);cursor:pointer;margin-bottom:26px}
  .back-btn:hover{border-color:var(--brand)}
  .pd-top{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
  .pd-main{width:100%;height:380px;object-fit:cover;border-radius:var(--radius)}
  .pd-thumbs{display:flex;gap:10px;margin-top:10px}
  .pd-thumbs img{width:84px;height:64px;object-fit:cover;border-radius:8px;cursor:pointer;border:2px solid transparent}
  .pd-thumbs img.on{border-color:var(--brand)}
  .pd-info h1{font-size:27px;margin:8px 0 12px;line-height:1.35}
  .pd-info>p{color:var(--muted);margin:0}
  .spec-table{width:100%;border-collapse:collapse;margin:20px 0;font-size:14.5px}
  .spec-table th,.spec-table td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
  .spec-table th{background:var(--bg-soft);width:32%;font-weight:700;white-space:nowrap}
  .pd-detail{margin-top:48px}
  .pd-detail h2{font-size:24px;margin:0 0 14px}
  .pd-detail>p{color:var(--muted);max-width:780px}
  .pd-detail figure{margin:26px 0}
  .pd-detail figure img{width:100%;height:420px;object-fit:cover;border-radius:var(--radius)}
  .pd-detail figcaption{font-size:13.5px;color:var(--muted);padding-top:8px}
  .article-wrap{max-width:780px}
  .article-wrap h1{font-size:28px;line-height:1.45;margin:10px 0 12px}
  .article-meta{color:var(--muted);font-size:14px;margin-bottom:24px}
  .article-body p{font-size:16.5px;line-height:1.85;margin:0 0 18px}
  @media (max-width:900px){
    .pd-top{grid-template-columns:1fr}
    .pd-main{height:300px}
    .pd-detail figure img{height:280px}
  }

  /* factory */
  .factory{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-bottom:30px}
  .factory figure{margin:0;border-radius:var(--radius);overflow:hidden}
  .factory figure img{width:100%;height:260px;object-fit:cover}
  .factory figcaption{font-size:13.5px;color:var(--muted);padding-top:8px}
  .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
  .step{border-top:3px solid var(--brand);padding-top:12px}
  .step b{display:block;font-size:16px;margin-bottom:4px}
  .step span{color:var(--muted);font-size:14px}

  /* contact */
  .cta{background:var(--brand-deep);color:#eaf3fa}
  .cta-in{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;padding:60px 0}
  .cta h2{color:#fff;font-size:29px;margin:0 0 10px}
  .cta p{color:#bcd6ea;margin:0 0 18px}
  .cta .tel-big{font-size:26px;font-weight:800;color:#fff;letter-spacing:.02em}
  .cta ul{margin:18px 0 0;padding:0;list-style:none;color:#cfe3f2;font-size:15px}
  .cta ul li{margin:6px 0}
  .cta ul li::before{content:"✓ ";color:#8fd0a0;font-weight:800}
  .cta .addr{margin-top:20px;color:#bcd6ea;font-size:15px}
  form.lead{background:var(--surface);color:var(--ink);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
  form.lead h3{margin:0 0 4px;font-size:20px}
  form.lead>p{color:var(--muted);font-size:13.5px;margin:0 0 16px}
  .frow{display:grid;grid-template-columns:1fr 1fr;gap:14px}
  label.fl{display:block;font-size:14px;font-weight:600;margin-bottom:14px}
  label.fl input,label.fl select,label.fl textarea{width:100%;margin-top:6px;padding:11px 12px;font:inherit;font-size:15px;
    border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink)}
  label.fl textarea{resize:vertical;min-height:84px}
  label.fl input:focus,label.fl select:focus,label.fl textarea:focus{outline:2px solid var(--brand);outline-offset:1px}
  .form-msg{font-size:14px;margin-top:12px;display:none}
  .form-msg.ok{display:block;color:var(--ok)}
  .form-msg.err{display:block;color:var(--err)}

  footer.site{background:#0b2438;color:#b9cfdf;padding:40px 0 28px;font-size:14.5px}
  @media (prefers-color-scheme: dark){footer.site{background:#0a141c}}
  .foot{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:32px}
  .foot h4{color:#fff;margin:0 0 12px;font-size:17px}
  .foot p{margin:4px 0}
  .foot a{color:#b9cfdf;cursor:pointer}
  .foot a:hover{color:#fff}
  .copy{border-top:1px solid rgba(255,255,255,.14);margin-top:28px;padding-top:16px;color:#7e99ad;font-size:13px;
    display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;align-items:center}
  .copy-right{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
  .foot-social{display:flex;gap:8px;align-items:center}
  .foot-social .fs-label{color:#b9cfdf;font-size:13.5px;font-weight:600}
  .foot-social a{width:38px;height:38px;border-radius:50%;border:1px solid rgba(255,255,255,.35);
    display:flex;align-items:center;justify-content:center;color:#dcebf6;cursor:pointer}
  .foot-social a:hover{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.6)}
  .foot-social svg{width:19px;height:19px;flex:none}

  /* product filter + counts */
  .filter-bar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}
  .filter-bar button{font:inherit;font-size:14.5px;font-weight:600;padding:8px 16px;border-radius:999px;
    border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer}
  .filter-bar button:hover{border-color:var(--brand);color:var(--brand)}
  .filter-bar button.on{background:var(--brand);border-color:var(--brand);color:#fff}
  .prod-count{color:var(--muted);font-size:14px;margin:0 0 22px}

  /* floating rail — socials, WhatsApp, back to top */
  .float-rail{position:fixed;right:16px;bottom:16px;z-index:90;display:flex;flex-direction:column;gap:9px;align-items:center}
  .float-rail a,.float-rail button{width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;
    background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);color:var(--brand);cursor:pointer;padding:0}
  .float-rail a:hover,.float-rail button:hover{transform:translateY(-2px)}
  .float-rail svg{width:22px;height:22px;flex:none}
  .float-rail .wa{background:#25d366;border-color:#25d366;color:#fff}
  .float-rail .to-top{background:var(--brand);border-color:var(--brand);color:#fff;font-size:20px;line-height:1;
    opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity .25s ease,visibility 0s linear .25s,transform .25s ease}
  .float-rail .to-top.show{opacity:1;visibility:visible;transform:none;transition:opacity .25s ease,transform .25s ease}
  @media (prefers-reduced-motion: reduce){.float-rail a:hover,.float-rail button:hover{transform:none}}
  @media (max-width:640px){.float-rail{right:10px;bottom:12px}.float-rail a,.float-rail button{width:42px;height:42px}}

  @media (max-width:900px){
    .grid3{grid-template-columns:repeat(2,1fr)}
    .grid4,.points{grid-template-columns:repeat(2,1fr)}
    .steps{grid-template-columns:repeat(2,1fr)}
    .about,.cta-in{grid-template-columns:1fr}
    .car-track{height:420px}
    .car-cap h1,.car-cap h2{font-size:30px}
    .banner h1{font-size:28px}
    .foot{grid-template-columns:1fr 1fr}
    .nav-tel{display:none}
  }
  @media (max-width:640px){
    nav.main{display:none;position:absolute;top:66px;left:0;right:0;background:var(--surface);
      flex-direction:column;gap:0;padding:8px 20px 14px;border-bottom:1px solid var(--line)}
    nav.main.open{display:flex}
    nav.main a{padding:10px 0;border-bottom:1px solid var(--line)}
    .burger{display:block;margin-left:auto}
    .lang{margin-left:auto}
    .burger{margin-left:0}
    .grid3,.grid4,.factory,.frow,.points{grid-template-columns:1fr}
    .car-track{height:400px}
    .car-cap p{font-size:15px}
    .car-nav{display:none}
    .banner{height:220px}
    .banner.short{height:170px}
    section{padding:44px 0}
    .foot{grid-template-columns:1fr}
  }
/* ---------- multi-page additions ---------- */
.lang a{background:none;border:0;padding:6px 13px;font:inherit;font-size:13.5px;font-weight:600;
  color:var(--muted);cursor:pointer;text-decoration:none;display:inline-block}
.lang a.on{background:var(--brand);color:#fff}
.breadcrumb{font-size:13.5px;color:var(--muted);margin:0 0 22px;line-height:1.7}
.breadcrumb a{color:var(--brand)}
.breadcrumb span{color:var(--muted)}
.cat-block{margin-bottom:52px}
.cat-title{font-size:23px;margin:0 0 18px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.card a{display:block;color:inherit;text-decoration:none}
.card h3 a{color:inherit}
.card-link:hover h3 a{color:var(--brand)}
.related{margin-top:56px;border-top:1px solid var(--line);padding-top:36px}
.related h2{font-size:22px;margin:0 0 20px}
.related .grid4{grid-template-columns:repeat(4,1fr)}
.related .card img{height:140px}
.news-card a{display:block;color:inherit;text-decoration:none}
.news-card time{display:block;margin:2px 0 6px}
.wa-hint{text-align:center;font-size:13.5px;margin:12px 0 0!important}
.wa-hint a{color:var(--brand);font-weight:700}
.btn.ghost.dark{background:transparent;color:var(--brand);border:1px solid var(--brand);margin-left:10px}
.btn.ghost.dark:hover{background:var(--chip)}
.pd-info .btn{margin-top:4px}
#newsGrid .news-card{display:block}
@media (max-width:900px){.related .grid4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){
  .related .grid4{grid-template-columns:1fr}
  .filter-bar{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:6px;
    scrollbar-width:none;margin:0 -20px 14px;padding-left:20px;padding-right:20px}
  .filter-bar::-webkit-scrollbar{display:none}
  .filter-bar button{flex:none}
  .cat-title{font-size:20px}
  .pd-info .btn{width:100%;margin:8px 0 0!important;text-align:center}
}

/* ---------- 分类导航页 ---------- */
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.catnav-card{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;
  transition:box-shadow .2s ease,transform .2s ease}
.catnav-card:hover{box-shadow:0 10px 28px rgba(14,40,66,.12);transform:translateY(-2px)}
.catnav-card>a{display:block;aspect-ratio:16/9;overflow:hidden}
.catnav-card img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s ease}
.catnav-card:hover img{transform:scale(1.04)}
.catnav-card .body{padding:20px 22px 22px}
.catnav-card h2{font-size:20px;margin:0 0 8px}
.catnav-card h2 a{color:var(--heading);text-decoration:none}
.catnav-card h2 a:hover{color:var(--brand)}
.catnav-card p{margin:0 0 14px;font-size:14.5px;color:var(--muted);line-height:1.7}
.cat-intro{font-size:15.5px;line-height:1.85;color:#41576b;max-width:860px;margin:0 0 30px;
  padding:16px 20px;background:var(--chip);border-left:3px solid var(--brand);border-radius:0 8px 8px 0}
.cat-others{margin-top:44px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:8px 18px;font-size:14px;color:var(--muted)}
.cat-others a{color:var(--brand);text-decoration:none;font-weight:600}
.cat-others a:hover{text-decoration:underline}
.cat-others a.on{color:var(--heading)}
.sec-title{font-size:21px;margin:44px 0 20px;padding-bottom:10px;border-bottom:1px solid var(--line)}
@media (max-width:900px){.grid2{grid-template-columns:1fr}}