:root{
  --blue:#4874CB;
  --blue-dark:#3460b5;
  --ink:#1a2030;
  --ink-2:#2b3242;
  --muted:#6b7280;
  --line:#e6e8ef;
  --bg:#ffffff;
  --bg-soft:#f7f8fc;
  --radius:14px;
  --shadow:0 8px 28px rgba(40,60,110,.08);
  --shadow-sm:0 4px 14px rgba(40,60,110,.06);
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  color:var(--ink-2);
  background:var(--bg);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:18px;height:72px}
.brand{display:flex;align-items:center;gap:12px;margin-right:auto}
.brand-logo{height:42px;width:auto}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:18px;color:var(--ink);letter-spacing:.5px}
.brand-text small{font-size:10px;color:var(--muted);letter-spacing:.3px}
.nav-menu{display:flex;gap:26px}
.nav-menu a{font-size:14.5px;color:var(--ink-2);font-weight:500;position:relative;padding:6px 0}
.nav-menu a:hover{color:var(--blue)}
.nav-menu a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--blue);transition:width .25s}
.nav-menu a:hover::after{width:100%}
.btn-consult{
  background:var(--blue);color:#fff;font-size:14px;font-weight:600;
  padding:9px 20px;border-radius:999px;transition:.2s;white-space:nowrap;
}
.btn-consult:hover{background:var(--blue-dark);transform:translateY(-1px);box-shadow:var(--shadow-sm)}
.nav-toggle{display:none;background:none;border:0;font-size:24px;color:var(--ink);cursor:pointer}

/* ===== Hero ===== */
.hero{padding:72px 0 60px;background:linear-gradient(180deg,#f7f8fc 0%,#ffffff 100%)}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-tag{display:inline-block;background:#eaf0fb;color:var(--blue);font-size:13px;font-weight:600;padding:6px 14px;border-radius:999px;margin-bottom:18px}
.hero h1{font-size:42px;line-height:1.2;color:var(--ink);font-weight:700;letter-spacing:-.5px}
.hero-sub{margin:16px 0 14px;font-size:16px;color:var(--blue);font-weight:600}
.hero-desc{font-size:15.5px;color:var(--muted);max-width:520px}
.hero-actions{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap}
.btn-primary{background:var(--blue);color:#fff;font-weight:600;font-size:15px;padding:12px 26px;border-radius:10px;transition:.2s;display:inline-block}
.btn-primary:hover{background:var(--blue-dark);transform:translateY(-1px);box-shadow:var(--shadow)}
.btn-ghost{border:1.5px solid var(--blue);color:var(--blue);font-weight:600;font-size:15px;padding:12px 26px;border-radius:10px;transition:.2s;display:inline-block}
.btn-ghost:hover{background:#eaf0fb}
.btn-sm{padding:9px 20px;font-size:14px}
.btn-block{display:block;text-align:center;margin-top:12px}
.hero-image img{border-radius:18px;box-shadow:var(--shadow);width:100%;object-fit:cover}

/* ===== Stats ===== */
.stats{background:var(--blue);color:#fff;padding:0}
.stats .container{padding-top:0;padding-bottom:0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);text-align:center}
.stats-grid div{padding:36px 10px}
.stats-grid strong{display:block;font-size:38px;font-weight:700;line-height:1}
.stats-grid span{font-size:14px;opacity:.9}

/* ===== Section base ===== */
.section{padding:76px 0}
.section-head{text-align:center;max-width:680px;margin:0 auto 46px}
.eyebrow{display:inline-block;color:var(--blue);font-weight:600;font-size:13px;letter-spacing:1px;text-transform:uppercase;margin-bottom:10px}
.section-head h2{font-size:32px;color:var(--ink);font-weight:700;letter-spacing:-.3px}
.section-head p{margin-top:12px;color:var(--muted);font-size:15.5px}

/* ===== About ===== */
.about{background:var(--bg)}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center}
.about-text .eyebrow{margin-bottom:8px}
.about-text h2{font-size:30px;color:var(--ink);font-weight:700;margin-bottom:18px}
.about-text p{color:var(--ink-2);margin-bottom:14px;font-size:15.5px}
.about-points{list-style:none;margin:18px 0 26px}
.about-points li{position:relative;padding-left:26px;margin-bottom:10px;color:var(--ink-2);font-size:15px}
.about-points li::before{content:"✓";position:absolute;left:0;top:0;color:var(--blue);font-weight:700}
.about-media{position:relative}
.about-media img{border-radius:18px;box-shadow:var(--shadow);width:100%}
.about-badge{position:absolute;right:-14px;bottom:24px;background:#fff;color:var(--blue);border-radius:14px;padding:16px 20px;box-shadow:var(--shadow);text-align:center;font-size:13px;line-height:1.3}
.about-badge strong{font-size:26px;display:block}

/* ===== Products ===== */
.products{background:var(--bg-soft)}
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.product-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:.22s;box-shadow:var(--shadow-sm)}
.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#cdd9f3}
.product-thumb{height:170px;overflow:hidden;background:#eef1f8}
.product-thumb img{width:100%;height:100%;object-fit:cover}
.product-body{padding:20px 20px 22px;display:flex;flex-direction:column;flex:1}
.product-body h3{font-size:18px;color:var(--ink);font-weight:700}
.product-tag{display:inline-block;align-self:flex-start;background:#eaf0fb;color:var(--blue);font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;margin:8px 0 10px}
.product-desc{font-size:13.5px;color:var(--muted);margin-bottom:14px;min-height:42px}
.model-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.model-link{display:inline-flex;align-items:center;gap:5px;background:var(--bg-soft);border:1px solid var(--line);color:var(--ink-2);font-size:12.5px;font-weight:600;padding:5px 10px;border-radius:8px;transition:.18s}
.model-link:hover{border-color:var(--blue);color:var(--blue);background:#eaf0fb}
.model-link::before{content:"⤓";color:var(--blue);font-weight:700}
.product-foot{margin-top:auto;font-size:12px;color:var(--muted);border-top:1px dashed var(--line);padding-top:10px}

/* ===== Advantages ===== */
.advantages{background:var(--bg)}
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.adv-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;transition:.2s}
.adv-card:hover{background:#fff;box-shadow:var(--shadow);transform:translateY(-3px)}
.adv-ico{font-size:28px;margin-bottom:12px}
.adv-card h3{font-size:17px;color:var(--ink);margin-bottom:8px}
.adv-card p{font-size:14px;color:var(--muted)}

/* ===== Applications ===== */
.applications{background:var(--bg-soft)}
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.app-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;transition:.2s}
.app-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.app-card span{font-size:30px;display:block;margin-bottom:12px}
.app-card h3{font-size:17px;color:var(--ink);margin-bottom:6px}
.app-card p{font-size:13.5px;color:var(--muted)}

/* ===== Certifications ===== */
.certs{background:var(--bg)}
.cert-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.cert-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:14px;cursor:pointer;transition:.2s;text-align:center}
.cert-card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:#cdd9f3}
.cert-card img{width:100%;height:150px;object-fit:contain;border-radius:8px;background:#fff}
.cert-card p{font-size:13px;color:var(--ink-2);margin-top:10px;font-weight:500}
.cert-icon .cert-placeholder{height:150px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#eaf0fb,#f4f7fd);border-radius:8px;color:var(--blue);font-weight:700;font-size:18px;letter-spacing:1px}

/* ===== Contact ===== */
.contact{background:linear-gradient(180deg,#f7f8fc,#ffffff)}
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start}
.contact-info .eyebrow{margin-bottom:8px}
.contact-info h2{font-size:30px;color:var(--ink);font-weight:700;margin-bottom:12px}
.contact-lead{color:var(--muted);margin-bottom:24px;font-size:15.5px}
.contact-list{list-style:none}
.contact-list li{display:flex;gap:14px;align-items:flex-start;padding:14px 0;border-bottom:1px solid var(--line)}
.contact-list span{font-size:22px}
.contact-list strong{display:block;font-size:14px;color:var(--ink);margin-bottom:2px}
.contact-list a,.contact-list p{color:var(--blue);font-size:15px;font-weight:600}
.contact-list p{color:var(--ink-2);font-weight:500}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow)}
.contact-card h3{font-size:20px;color:var(--ink);margin-bottom:10px}
.contact-card p{color:var(--muted);font-size:14.5px;margin-bottom:6px}

/* ===== Footer ===== */
.site-footer{background:var(--bg-soft);border-top:1px solid var(--line);color:var(--ink-2)}
.footer-top{display:grid;grid-template-columns:1.6fr 1.4fr 1fr 1fr;gap:30px;padding:46px 22px 32px}
.footer-products{display:grid;grid-template-columns:1fr 1fr;column-gap:16px;align-content:start}
.footer-products h4{grid-column:1 / -1}
.footer-products a{padding:5px 0}
.footer-logo{height:38px;margin-bottom:14px}
.footer-brand p{font-size:13.5px;color:var(--muted);line-height:1.6}
.footer-col h4{font-size:14px;color:var(--ink);margin-bottom:14px;font-weight:700}
.footer-col a{display:block;font-size:13.5px;color:var(--muted);padding:5px 0;transition:.18s}
.footer-col a:hover{color:var(--blue)}
.footer-bottom{border-top:1px solid var(--line);padding:18px 22px;text-align:center;color:var(--muted);font-size:12.5px}
.footer-bottom p{margin:4px 0}
.footer-bottom a{color:#4874CB;text-decoration:underline;word-break:break-all}
.footer-bottom a:hover{color:#2f5bb5}

/* ===== Lightbox ===== */
.lightbox{position:fixed;inset:0;background:rgba(20,28,48,.86);display:none;align-items:center;justify-content:center;flex-direction:column;z-index:100;padding:30px}
.lightbox.show{display:flex}
.lightbox img{max-width:90vw;max-height:82vh;border-radius:10px;box-shadow:0 20px 60px rgba(0,0,0,.5);background:#fff}
.lightbox p{color:#fff;margin-top:16px;font-size:15px}
.lightbox-close{position:absolute;top:22px;right:30px;color:#fff;font-size:40px;cursor:pointer;line-height:1}
.lightbox-pdf{display:none;width:90vw;height:82vh;background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lightbox-pdf iframe{width:100%;height:100%;border:0}
.btn-download{display:none;margin-top:16px;background:#fff;color:var(--blue);font-weight:600;padding:10px 24px;border-radius:8px;transition:.2s}
.btn-download:hover{background:#eaf0fb}

/* ===== Responsive ===== */
@media (max-width:980px){
  .hero-inner{grid-template-columns:1fr;gap:30px}
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:32px}
  .product-grid,.adv-grid,.app-grid{grid-template-columns:repeat(2,1fr)}
  .cert-grid{grid-template-columns:repeat(3,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
  .hero h1{font-size:34px}
}
@media (max-width:640px){
  .nav-menu{position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:8px 0;box-shadow:var(--shadow);display:none;border-bottom:1px solid var(--line)}
  .nav-menu.open{display:flex}
  .nav-menu a{padding:12px 22px}
  .nav-toggle{display:block}
  .btn-consult{display:none}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .product-grid,.adv-grid,.app-grid,.cert-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr;gap:22px}
  .hero h1{font-size:28px}
  .section{padding:54px 0}
  .section-head h2{font-size:26px}
}