:root{
  --primary:#1668DC; --primary-600:#1358C4; --primary-700:#0f49a4;
  --text:#0b1220; --muted:#4a5568; --bg:#ffffff; --bg-alt:#f6f8fb; --card:#ffffff; --border:#e5e7eb;
  --shadow:0 8px 24px rgba(22,104,220,.12), 0 2px 8px rgba(22,104,220,.06);
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,PingFang SC,Microsoft Yahei,sans-serif;color:var(--text);background:var(--bg);}
img{max-width:100%;display:block}
.container{max-width:1120px;margin:0 auto;padding:0 20px}
.section{padding:72px 0}
.section.alt{background:var(--bg-alt)}
.section-title{margin:0 0 12px;font-size:28px}
.section-desc{margin:0 0 32px;color:var(--muted)}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.8);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid rgba(0,0,0,.04)}
.nav-row{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;color:inherit;text-decoration:none;font-weight:600}
.brand-mark{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--primary),#49a3ff)}
.brand-text{margin-left:10px}
.nav{position:relative}
.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;padding:6px 10px;font-size:18px}
.nav-list{display:flex;gap:18px;list-style:none;margin:0;padding:0;align-items:center}
.nav-list a{color:inherit;text-decoration:none;padding:8px 10px;border-radius:8px}
.nav-list a:hover{background:#f2f5fa}
.nav-list .cta{background:var(--primary);color:#fff}
.nav-list .cta:hover{background:var(--primary-600)}

/* Hero */
.hero{position:relative;overflow:hidden}
.hero .hero-content{max-width:780px}
.hero h1{margin:0 0 12px;font-size:40px;line-height:1.2}
.hero .subtitle{margin:0 0 20px;color:var(--muted);font-size:18px}
.actions{display:flex;gap:14px;margin:20px 0 14px}
.btn{display:inline-block;padding:12px 18px;border-radius:10px;border:1px solid var(--border);text-decoration:none;color:inherit}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-600)}
.btn-ghost:hover{background:#f2f5fa}
.highlights{display:flex;flex-wrap:wrap;gap:12px;margin:14px 0 0;padding:0;list-style:none;color:var(--muted)}
.highlights li{background:#f4f7fb;border:1px solid var(--border);border-radius:999px;padding:6px 12px}
.hero-bg{position:absolute;inset:-20% -10% auto -10%;height:60%;background:radial-gradient(600px 300px at 20% 40%,rgba(22,104,220,.12),transparent 60%),radial-gradient(600px 300px at 80% 20%,rgba(22,104,220,.1),transparent 60%)}

/* Cards */
.grid.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px;box-shadow:var(--shadow)}
.card .icon{width:40px;height:40px;border-radius:10px;margin-bottom:8px;background:linear-gradient(135deg,var(--primary),#49a3ff);display:none}
.card .icon.icon-img{background:#fff;border:1px solid var(--border);display:flex;align-items:center;justify-content:center;padding:6px}
.card .icon.icon-img img{max-width:100%;max-height:100%;object-fit:contain}
.card h3{margin:6px 0 8px;font-size:18px}
.card p{margin:0;color:var(--muted)}

/* Cases */
.grid.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.case-card{background:var(--card);border:1px solid var(--border);border-radius:16px;overflow:hidden;box-shadow:var(--shadow)}
.case-card .thumb{height:140px;background:linear-gradient(135deg,#dbeafe,#bfdbfe)}
.case-card .thumb.b{background:linear-gradient(135deg,#dcfce7,#bbf7d0)}
.case-card .thumb.c{background:linear-gradient(135deg,#fee2e2,#fecaca)}
.case-card .thumb.has-image{background:#fff;display:flex;align-items:center;justify-content:center}
.case-card .thumb.has-image img{width:100%;height:100%;object-fit:cover;display:block}
.case-card .case-body{padding:16px}
.case-card h3{margin:0 0 8px;font-size:18px}
.case-card p{margin:0 0 10px;color:var(--muted)}
.tags{display:flex;gap:8px;list-style:none;margin:0;padding:0}
.tags li{background:#f4f7fb;border:1px solid var(--border);border-radius:999px;padding:4px 10px;font-size:12px;color:#334155}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.step{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:14px;text-align:center}
.step span{display:inline-block;background:#eef2ff;color:#3730a3;border-radius:999px;padding:2px 8px;margin-bottom:6px;font-weight:600}
.step b{display:block;margin-bottom:4px}
.step em{color:var(--muted);font-style:normal;font-size:12px}

/* Advantages */
.grid.advantages{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.adv{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px}
.adv h3{margin:0 0 6px;font-size:18px}
.adv p{margin:0;color:var(--muted)}

/* About */
.about{margin:0;color:var(--muted);line-height:1.8}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:24px;align-items:stretch}
.contact-info{display:flex;flex-direction:column;gap:16px;height:100%}
.contact-info ul{list-style:none;margin:0;padding:0}
.contact-info li{margin:8px 0}
.company-map{margin-top:16px}
.map-canvas{width:100%;height:320px;border-radius:16px;border:1px solid var(--border);box-shadow:var(--shadow);overflow:hidden}
.map-marker{width:44px;height:44px;border-radius:50%;background:var(--primary);display:flex;align-items:center;justify-content:center;box-shadow:0 10px 22px rgba(22,104,220,.35);border:3px solid rgba(255,255,255,.7)}
.map-marker::after{content:'';width:12px;height:12px;border-radius:50%;background:#fff}
.contact-form{display:grid;gap:12px}
.contact-form label{display:grid;gap:6px;font-size:14px}
.contact-form input,.contact-form textarea{border:1px solid var(--border);border-radius:10px;padding:10px 12px;font:inherit}
.contact-form input:focus,.contact-form textarea:focus{outline:2px solid rgba(22,104,220,.22);border-color:var(--primary)}
.form-status{margin:6px 0 0;color:var(--primary-700)}

/* Footer */
.site-footer{border-top:1px solid rgba(0,0,0,.06);background:#fff}
.foot{display:flex;justify-content:space-between;align-items:center;height:64px;color:#475569}
.foot .icp{color:#94a3b8}

/* To Top */
.to-top{position:fixed;right:18px;bottom:18px;width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:var(--primary);color:#fff;text-decoration:none;opacity:.0;pointer-events:none;transition:opacity .2s, transform .2s;box-shadow:var(--shadow)}
.to-top.show{opacity:1;pointer-events:auto}
.to-top:hover{transform:translateY(-2px)}

/* Responsive */
@media (max-width: 1024px){
  .grid.cards{grid-template-columns:repeat(2,1fr)}
  .grid.cases{grid-template-columns:repeat(2,1fr)}
  .grid.advantages{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr)}
}
@media (max-width: 720px){
  .nav-toggle{display:inline-block}
  .nav-list{position:absolute;right:0;top:52px;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--border);border-radius:12px;padding:10px;min-width:200px;display:none}
  .nav-list.open{display:flex}
  .nav-list a{padding:10px 12px}
  .hero h1{font-size:30px}
  .container{padding:0 16px}
  .grid.cards{grid-template-columns:1fr}
  .grid.cases{grid-template-columns:1fr}
  .grid.advantages{grid-template-columns:1fr}
  .steps{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .map-canvas{height:260px}
}

/* Brand logo image */
.brand-logo{width:28px;height:28px;border-radius:8px;display:block;object-fit:contain}