:root{
  --primary:#0a5d8f;
  --primary-dark:#083f61;
  --accent:#16a2a2;
  --text:#1e293b;
  --muted:#64748b;
  --bg:#ffffff;
  --bg-soft:#f7fafc;
  --border:#dbe4ee;
  --footer:#f8fbfd;
  --footer-text:#5b6573;
  --container:1180px;
  --radius:14px;
  --shadow:0 10px 25px rgba(2,18,38,.08);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Arial,Helvetica,sans-serif;
  color:var(--text);
  background:#fff;
  line-height:1.65;
}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(var(--container),calc(100% - 32px));margin:0 auto}

.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.95);
  border-bottom:1px solid var(--border);
  backdrop-filter:blur(10px);
}
.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;
  gap:32px;padding:10px 0;
}
.logo{
  display:flex;align-items:center;gap:4px;
  color:var(--text);text-decoration:none;
}
.logo:hover{
  text-decoration:none;
}
.brand-text{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:2px;
  color:#0f2538;
  line-height:1.1;
  width:230px;
  text-align:center;
}
.site-header .brand-text{
  align-items:flex-start;
  width:auto;
  text-align:left;
}
.brand-cn{
  font-size:20px;
  font-weight:800;
  white-space:nowrap;
}
.brand-en{
  font-size:11px;
  font-weight:700;
  letter-spacing:.02em;
  white-space:nowrap;
}
.logo img{width:56px;height:56px;object-fit:contain}
.site-nav{display:flex;align-items:center;gap:28px}
.site-nav a{color:var(--text);font-size:15px;font-weight:600}
.site-nav .nav-cta{
  color:#fff !important;
  min-height:42px;
  padding:9px 18px;
  line-height:22px;
}
.menu-toggle{
  display:none;background:none;border:none;font-size:28px;cursor:pointer;color:var(--primary);
}

.btn{
  display:inline-block;
  background:var(--primary);
  color:#fff !important;
  min-height:54px;
  padding:14px 24px;
  border-radius:999px;
  font-weight:700;
  border:1px solid var(--primary);
  text-decoration:none;
  line-height:24px;
}
.btn:hover{background:var(--primary-dark);border-color:var(--primary-dark);text-decoration:none}
.btn-outline{
  background:transparent;
  color:var(--primary) !important;
}
.btn-sm{padding:10px 16px}

.hero{
  background:
    radial-gradient(circle at 82% 30%, rgba(22,162,162,.10), transparent 26%),
    linear-gradient(135deg,#f2f9fc 0%,#ffffff 68%);
  padding:76px 0 78px;
}
.hero-grid{
  display:grid;
  grid-template-columns:minmax(0, 1fr) 480px;
  gap:40px;
  align-items:center;
}
.hero-grid > div:first-child{
  max-width:760px;
}
.eyebrow{
  color:var(--accent);
  text-transform:uppercase;
  letter-spacing:.08em;
  font-weight:700;
  font-size:13px;
}
.hero h1{
  font-size:40px;
  line-height:1.12;
  font-weight:700;
  margin:0 0 18px;
  color:#1F2A44;
  letter-spacing:0;
  white-space:nowrap;
}
.hero-subtitle{
  font-size:28px;
  line-height:1.3;
  font-weight:600;
  color:#133B6B;
  margin-bottom:24px;
}
.hero-text{
  max-width:620px;
  font-size:18px;
  font-weight:400;
  line-height:1.8;
  color:#4F6B8A;
  margin-bottom:0;
}
.hero-visual{
  display:flex;
  justify-content:center;
}
.hero-visual img{
  width:min(328px,100%);
  border-radius:0;
  box-shadow:none;
}
.network-card{
  position:relative;
  width:330px;
  aspect-ratio:1.08;
  border:1px solid rgba(10,93,143,.14);
  border-radius:22px;
  background:
    linear-gradient(145deg, rgba(255,255,255,.88), rgba(238,248,251,.74)),
    radial-gradient(circle at 68% 36%, rgba(22,162,162,.16), transparent 36%);
  box-shadow:0 24px 60px rgba(7,42,74,.10);
  overflow:hidden;
}
.network-card::before,
.network-card::after{
  content:"";
  position:absolute;
  inset:42px;
  border:1px solid rgba(10,93,143,.14);
  border-radius:999px;
}
.network-card::after{
  inset:88px;
  border-color:rgba(22,162,162,.18);
}
.node{
  position:absolute;
  z-index:2;
  width:18px;
  height:18px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 8px rgba(22,162,162,.12);
}
.node-a{left:74px;top:88px}
.node-b{right:78px;top:108px}
.node-c{left:118px;bottom:84px}
.node-d{right:102px;bottom:104px}
.network-line{
  position:absolute;
  height:1px;
  background:linear-gradient(90deg, rgba(10,93,143,.08), rgba(10,93,143,.36), rgba(10,93,143,.08));
  transform-origin:left center;
}
.line-a{left:90px;top:103px;width:205px;transform:rotate(5deg)}
.line-b{left:132px;top:208px;width:170px;transform:rotate(-32deg)}
.line-c{left:126px;bottom:95px;width:155px;transform:rotate(8deg)}
.network-ring{
  position:absolute;
  left:50%;
  top:50%;
  width:92px;
  height:92px;
  border-radius:50%;
  border:18px solid rgba(10,93,143,.86);
  transform:translate(-50%,-50%);
}
.hero-card,.card,.cta-box,.cta-inline{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);
}
.hero-card{padding:24px}

.section{padding:64px 0}
.section-sm{padding:28px 0}
.section.alt{background:var(--bg-soft)}
.section-head{margin-bottom:24px}
.section-head h2{margin:0 0 8px}
.card-grid{
  display:grid;gap:20px;
}
.card-grid.two{grid-template-columns:repeat(2,1fr)}
.card-grid.three{grid-template-columns:repeat(3,1fr)}
.card-grid.four{grid-template-columns:repeat(4,1fr)}
.card{
  padding:22px;
}
.card h2,.card h3{margin-top:0}
.page{padding:42px 0 70px}
.breadcrumbs{
  font-size:14px;color:var(--muted);margin-bottom:16px;
}
.contact-list, .site-footer ul{list-style:none;padding:0;margin:0}
.contact-list li{margin:8px 0}
.cta-row{display:flex;gap:16px;flex-wrap:wrap;margin-top:32px}
.cta-inline{
  padding:24px;margin:26px 0;
}
.cta-band{padding-top:20px;padding-bottom:70px}
.cta-box{
  padding:28px;display:flex;align-items:center;justify-content:space-between;gap:18px;
}
.center{text-align:center}
.center-logo{justify-content:center}
.not-found{display:flex;align-items:center;min-height:100vh}

.site-footer{
  background:var(--footer);
  color:var(--footer-text);
  border-top:1px solid var(--border);
  padding-top:40px;
}
.site-footer a{color:var(--primary)}
.footer-grid{
  display:grid;
  grid-template-columns:1.35fr .75fr .9fr;
  gap:42px;
  align-items:stretch;
}
.footer-grid > div:first-child{
  display:flex;
  align-items:flex-start;
  justify-content:center;
  padding-top:10px;
}
.footer-logo{
  color:var(--text);
  flex-direction:column;
  justify-content:center;
  gap:8px;
  margin-bottom:0;
  min-height:auto;
  text-align:center;
}
.footer-logo .brand-text{
  align-items:center;
  width:230px;
}
.footer-logo .brand-cn{
  font-size:20px;
}
.footer-logo .brand-en{
  font-size:11px;
  letter-spacing:.02em;
}
.footer-logo img{
  width:99px;
  height:99px;
  filter:none;
}
.site-footer p{
  max-width:420px;
  color:var(--muted);
}
.footer-grid > div:first-child p{
  font-size:15px;
  font-weight:400;
  line-height:1.65;
  color:var(--muted);
}
.site-footer h3{
  margin:0 0 18px;
  color:#0f2538;
  font-size:17px;
  letter-spacing:.04em;
  text-transform:none;
}
.site-footer li{
  margin:10px 0;
  color:var(--muted);
  font-size:17px;
}
.site-footer li a{color:#006398}
.site-footer li:not(:has(a)){color:#5B6F88}
.site-footer a:hover{
  color:var(--primary-dark);
  text-decoration:none;
}
.footer-bottom{
  border-top:1px solid var(--border);
  margin-top:22px;padding:18px 0;
  font-size:14px;color:var(--muted);
  text-align:center;
}
.footer-bottom p{
  max-width:none;
  margin:0;
}

ul{padding-left:20px}
h1,h2,h3{line-height:1.25}
p{margin:0 0 12px}
section:last-child p:last-child{margin-bottom:0}

@media (max-width: 980px){
  .hero-grid,.card-grid.two,.card-grid.three,.card-grid.four,.footer-grid,.cta-box{
    grid-template-columns:1fr;
  }
  .hero{padding:58px 0 62px}
  .hero h1{
    font-size:38px;
    white-space:normal;
  }
  .hero-subtitle{font-size:21px}
  .hero-text{font-size:16px}
  .hero-visual{display:none}
  .logo img{width:50px;height:50px}
  .brand-text{width:210px}
  .brand-cn{font-size:19px}
  .brand-en{font-size:10px}
  .footer-logo img{width:50px;height:50px}
  .site-nav{
    display:none;
    position:absolute;top:66px;left:0;right:0;
    background:#fff;border-bottom:1px solid var(--border);
    padding:16px;
    flex-direction:column;align-items:flex-start;
  }
  .site-nav.open{display:flex}
  .menu-toggle{display:block}
}

@media (max-width: 520px){
  .hero h1{
    font-size:34px;
    line-height:1.14;
  }
  .hero-subtitle{
    font-size:20px;
  }
  .cta-row{
    gap:12px;
  }
}