:root{
  --navy:#002070;
  --navy-deep:#00164d;
  --blue:#003399;
  --red:#ff3300;
  --ink:#1a2233;
  --muted:#5b6577;
  --line:#e6e9f0;
  --bg:#ffffff;
  --bg-alt:#f5f7fb;
  --radius:16px;
  --shadow:0 10px 30px rgba(0,32,112,.08);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Inter","Montserrat",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.6;
}
.container{max-width:1180px;margin:0 auto;padding:0 24px}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand-logo{height:46px;width:auto}
.main-nav{display:flex;gap:30px}
.main-nav a{font-weight:600;font-size:15px;color:var(--ink);transition:color .2s}
.main-nav a:hover{color:var(--red)}
.header-right{display:flex;align-items:center;gap:14px}
.lang-toggle{
  border:1.5px solid var(--navy);color:var(--navy);background:transparent;
  font-weight:700;font-size:14px;padding:7px 16px;border-radius:999px;cursor:pointer;transition:.2s;
}
.lang-toggle:hover{background:var(--navy);color:#fff}
.nav-burger{display:none;background:none;border:none;font-size:26px;cursor:pointer;color:var(--navy)}

/* ===== Hero ===== */
.hero{
  background:linear-gradient(135deg,var(--navy-deep) 0%,var(--blue) 55%,#0a47b8 100%);
  color:#fff;position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,51,0,.35),transparent 70%);
}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;padding:90px 0 100px;position:relative;z-index:2}
.eyebrow{display:inline-block;background:rgba(255,255,255,.14);color:#ffd9cc;
  padding:6px 14px;border-radius:999px;font-size:13px;font-weight:600;letter-spacing:.5px;margin-bottom:18px}
.hero h1{font-family:"Montserrat",sans-serif;font-weight:800;font-size:44px;line-height:1.15;margin-bottom:18px}
.hero-sub{font-size:17px;color:#d8e1f5;max-width:520px;margin-bottom:28px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 26px;border-radius:999px;font-weight:700;font-size:15px;cursor:pointer;border:none;transition:.2s}
.btn-primary{background:var(--red);color:#fff}
.btn-primary:hover{background:#e62e00;transform:translateY(-2px)}
.btn-ghost{background:transparent;border:1.5px solid rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.hero-stats{display:flex;gap:38px;margin-top:42px}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats strong{font-family:"Montserrat";font-size:26px;font-weight:800}
.hero-stats span{font-size:13px;color:#bcc8e6}
.hero-visual{display:flex;justify-content:center;align-items:center}
.hero-badge{
  background:rgba(255,255,255,.08);border:1.5px solid rgba(255,255,255,.25);
  border-radius:24px;padding:38px 46px;text-align:center;backdrop-filter:blur(4px);
}
.hero-badge-top{display:block;font-family:"Montserrat";font-weight:800;font-size:38px;letter-spacing:1px}
.hero-badge-top .s{color:#7ea8ff}.hero-badge-top .d{color:var(--red)}
.hero-badge-bottom{display:block;margin-top:10px;font-size:13px;letter-spacing:3px;color:#cdd8f3}

/* ===== Sections ===== */
.section{padding:84px 0}
.section-alt{background:var(--bg-alt)}
.section-head{max-width:680px;margin:0 auto 48px;text-align:center}
.section-tag{display:inline-block;color:var(--red);font-weight:700;font-size:13px;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:12px}
.section-head h2{font-family:"Montserrat";font-weight:700;font-size:32px;line-height:1.25;margin-bottom:14px}
.section-head p{color:var(--muted);font-size:16px}

/* ===== Product grid ===== */
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:26px}
.prod-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;
  box-shadow:var(--shadow);transition:.25s;display:flex;flex-direction:column;
}
.prod-card:hover{transform:translateY(-4px);border-color:#c7d2ee}
.prod-card .pc-head{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.prod-card .pc-num{font-family:"Montserrat";font-weight:800;font-size:15px;color:#fff;background:var(--navy);width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center}
.prod-card h3{font-family:"Montserrat";font-weight:700;font-size:19px}
.prod-card .pc-type{font-size:13px;color:var(--red);font-weight:600;margin-bottom:14px}
.prod-card .pc-desc{color:var(--muted);font-size:14px;margin-bottom:16px;min-height:42px}
.spec-row{display:flex;justify-content:space-between;font-size:13px;padding:7px 0;border-top:1px dashed var(--line)}
.spec-row span:first-child{color:var(--muted)}
.spec-row span:last-child{font-weight:600;text-align:right}
.pc-models{margin-top:16px;font-size:12.5px;color:var(--muted);background:var(--bg-alt);border-radius:10px;padding:10px 12px}
.pc-models b{color:var(--ink)}

/* ===== About ===== */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:50px;align-items:center}
.about-text h2{font-family:"Montserrat";font-weight:700;font-size:30px;line-height:1.3;margin:10px 0 18px}
.about-text p{color:var(--muted);margin-bottom:14px}
.about-list{list-style:none;margin-top:18px;display:flex;flex-direction:column;gap:10px}
.about-list li{position:relative;padding-left:26px;font-size:15px}
.about-list li::before{content:"✓";position:absolute;left:0;top:0;color:var(--red);font-weight:800}
.about-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.mini-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;text-align:center;box-shadow:var(--shadow)}
.mini-num{display:block;font-family:"Montserrat";font-weight:800;font-size:30px;color:var(--navy)}
.mini-num small{font-size:15px;font-weight:700}
.mini-card span:last-child{font-size:13px;color:var(--muted)}

/* ===== Advantages ===== */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.adv-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:.25s}
.adv-card:hover{transform:translateY(-4px);border-color:#c7d2ee}
.adv-icon{font-size:30px;margin-bottom:14px}
.adv-card h3{font-family:"Montserrat";font-weight:700;font-size:18px;margin-bottom:8px}
.adv-card p{color:var(--muted);font-size:14px}

/* ===== Contact ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:start}
.contact-info h2{font-family:"Montserrat";font-weight:700;font-size:30px;margin:10px 0 14px}
.contact-info p{color:var(--muted);margin-bottom:22px}
.contact-list{list-style:none;display:flex;flex-direction:column;gap:16px}
.contact-list li{display:flex;flex-direction:column;border-left:3px solid var(--red);padding-left:14px}
.contact-list strong{font-size:13px;color:var(--muted);font-weight:600}
.contact-list span{font-size:16px;font-weight:600}
.contact-list a{color:var(--navy);text-decoration:none}
.contact-list a:hover{color:var(--red);text-decoration:underline}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:14px}
.contact-form input,.contact-form select,.contact-form textarea{
  width:100%;padding:13px 15px;border:1.5px solid var(--line);border-radius:10px;font-size:15px;font-family:inherit;color:var(--ink);
}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:none;border-color:var(--navy)}
.form-note{font-size:12px;color:var(--muted)}

/* ===== Footer ===== */
.site-footer{background:var(--navy-deep);color:#cdd8f3;padding:54px 0 22px}
.footer-inner{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;margin-bottom:30px}
.footer-logo{height:42px;margin-bottom:12px;filter:brightness(0) invert(1)}
.footer-brand p{font-size:14px;max-width:280px}
.footer-links{display:flex;gap:26px;flex-wrap:wrap;align-items:flex-start}
.footer-links a{color:#cdd8f3;font-weight:600;font-size:15px}
.footer-links a:hover{color:var(--red)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:18px;font-size:13px;color:#8fa0c8}

/* ===== Responsive ===== */
@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;padding:60px 0 70px}
  .hero h1{font-size:34px}
  .hero-visual{display:none}
  .about-grid{grid-template-columns:1fr;gap:30px}
  .adv-grid{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr;gap:30px}
  .main-nav{position:fixed;top:72px;left:0;right:0;background:#fff;flex-direction:column;gap:0;
    border-bottom:1px solid var(--line);max-height:0;overflow:hidden;transition:max-height .3s}
  .main-nav.open{max-height:320px}
  .main-nav a{padding:14px 24px;border-top:1px solid var(--line)}
  .nav-burger{display:block}
}
@media(max-width:560px){
  .adv-grid{grid-template-columns:1fr}
  .hero-stats{gap:22px}
  .hero-stats strong{font-size:22px}
  .section-head h2{font-size:26px}
}