:root{
  --brand:#2563eb;
  --brand-dark:#1d4ed8;
  --brand-light:#3b82f6;
  --accent:#0ea5e9;
  --ink:#0f172a;
  --ink-2:#334155;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#ffffff;
  --bg-soft:#f8fafc;
  --bg-deep:#0b1220;
  --radius:16px;
  --shadow:0 10px 30px rgba(15,23,42,.08);
  --max:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
.container{max-width:var(--max);margin:0 auto;padding:0 24px}
.wrap{max-width:820px;margin:0 auto;padding:0 24px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:.5px}
.brand .logo{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900}
.nav-links{display:flex;align-items:center;gap:30px;list-style:none}
.nav-links a{color:var(--ink-2);font-weight:600;font-size:15px;transition:color .2s}
.nav-links a:hover{color:var(--brand)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:999px;font-weight:700;font-size:15px;transition:transform .15s,box-shadow .2s,background .2s;cursor:pointer;border:0}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-1px);box-shadow:var(--shadow)}
.btn-ghost{background:transparent;color:var(--brand);border:1.5px solid var(--brand)}
.btn-ghost:hover{background:rgba(37,99,235,.06)}
.btn-light{background:#fff;color:var(--brand)}
.btn-light:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;flex-direction:column;gap:5px;padding:8px}
.nav-toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px}

/* Hero */
.hero{position:relative;overflow:hidden;background:radial-gradient(1200px 500px at 80% -10%,rgba(14,165,233,.18),transparent),linear-gradient(180deg,#f8fafc,#ffffff)}
.hero-inner{padding:96px 0 80px;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(37,99,235,.1);color:var(--brand);font-weight:700;font-size:13px;padding:6px 14px;border-radius:999px;margin-bottom:20px}
.hero h1{font-size:46px;line-height:1.18;letter-spacing:-.5px;margin-bottom:18px}
.hero h1 .hl{background:linear-gradient(135deg,var(--brand),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:18px;color:var(--ink-2);max-width:520px;margin-bottom:30px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-visual{position:relative;background:linear-gradient(135deg,#0f172a,#1e3a8a);border-radius:24px;padding:30px;color:#fff;box-shadow:var(--shadow);min-height:340px;display:flex;flex-direction:column;justify-content:center;gap:18px}
.hero-visual .tag{font-size:13px;opacity:.7;letter-spacing:1px;text-transform:uppercase}
.hero-visual .big{font-size:30px;font-weight:800;line-height:1.3}
.hero-visual .row{display:flex;align-items:center;gap:12px;font-size:15px;opacity:.92}
.hero-visual .dot{width:10px;height:10px;border-radius:50%;background:#22d3ee;flex:none}

/* Stats strip */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:30px;margin-top:-40px;position:relative;z-index:5}
.stat .num{font-size:34px;font-weight:900;color:var(--brand)}
.stat .label{color:var(--muted);font-size:14px}

/* Section */
section{padding:80px 0}
.section-head{text-align:center;max-width:680px;margin:0 auto 48px}
.section-head .kicker{color:var(--brand);font-weight:700;letter-spacing:2px;font-size:13px;text-transform:uppercase}
.section-head h2{font-size:34px;margin:12px 0 14px;letter-spacing:-.4px}
.section-head p{color:var(--ink-2);font-size:17px}

/* Feature grid */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:transform .2s,box-shadow .2s,border-color .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(37,99,235,.35)}
.card .ic{width:48px;height:48px;border-radius:12px;background:rgba(37,99,235,.1);color:var(--brand);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:8px}
.card p{color:var(--ink-2);font-size:15px}
.card .more{display:inline-block;margin-top:14px;color:var(--brand);font-weight:700;font-size:14px}

/* Services list */
.service{display:flex;gap:18px;align-items:flex-start;padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg)}
.service .num{font-size:22px;font-weight:800;color:var(--brand);flex:none;width:44px;height:44px;border-radius:12px;background:rgba(37,99,235,.1);display:flex;align-items:center;justify-content:center}
.service h3{font-size:18px;margin-bottom:6px}
.service p{color:var(--ink-2);font-size:15px}

/* Why */
.why{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.checklist{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.checklist li{display:flex;gap:12px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}
.checklist .ck{color:#16a34a;flex:none;margin-top:3px}
.checklist b{display:block;margin-bottom:2px}
.checklist span{color:var(--muted);font-size:14px}

/* CTA */
.cta{background:linear-gradient(135deg,#0f172a,#1e3a8a);color:#fff;border-radius:24px;padding:56px;text-align:center;position:relative;overflow:hidden}
.cta h2{font-size:32px;margin-bottom:12px}
.cta p{opacity:.85;margin-bottom:26px;font-size:17px}
.cta .hero-cta{justify-content:center}

/* Page hero (inner) */
.page-hero{background:linear-gradient(180deg,#f8fafc,#ffffff);padding:70px 0 50px;border-bottom:1px solid var(--line)}
.page-hero h1{font-size:40px;letter-spacing:-.5px;margin-bottom:12px}
.page-hero p{color:var(--ink-2);font-size:18px;max-width:680px}
.breadcrumb{font-size:14px;color:var(--muted);margin-bottom:16px}
.breadcrumb a{color:var(--brand)}

/* About */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.about-grid h2{font-size:30px;margin-bottom:16px}
.about-grid p{color:var(--ink-2);margin-bottom:14px}
.timeline{list-style:none;border-left:2px solid var(--line);padding-left:22px;margin-top:10px}
.timeline li{position:relative;padding-bottom:22px}
.timeline li::before{content:"";position:absolute;left:-29px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--brand);border:3px solid #fff;box-shadow:0 0 0 2px var(--line)}
.timeline b{display:block}
.timeline span{color:var(--muted);font-size:14px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.info-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.info-card h3{margin-bottom:16px}
.info-row{display:flex;gap:12px;align-items:flex-start;padding:12px 0;border-bottom:1px dashed var(--line)}
.info-row:last-child{border-bottom:0}
.info-row .ic{color:var(--brand);flex:none;margin-top:3px}
.info-row b{display:block;font-size:14px;color:var(--muted);font-weight:600}
.info-row span,.info-row a{font-size:16px;color:var(--ink)}
.form label{display:block;font-weight:600;margin:14px 0 6px;font-size:14px}
.form input,.form textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font:inherit;font-size:15px;background:#fff;transition:border-color .2s,box-shadow .2s}
.form input:focus,.form textarea:focus{outline:0;border-color:var(--brand);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.form textarea{resize:vertical;min-height:120px}
.note{font-size:13px;color:var(--muted);margin-top:10px}

/* Footer */
.site-footer{background:var(--bg-deep);color:#cbd5e1;padding:60px 0 30px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px}
.site-footer .brand{color:#fff;margin-bottom:14px}
.foot-col h4{color:#fff;font-size:15px;margin-bottom:16px}
.foot-col ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.foot-col a{color:#94a3b8;font-size:14px;transition:color .2s}
.foot-col a:hover{color:#fff}
.foot-about{font-size:14px;line-height:1.8;color:#94a3b8;max-width:300px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px;color:#64748b}

/* 404 */
.notfound{text-align:center;padding:120px 0}
.notfound h1{font-size:90px;color:var(--brand);margin-bottom:10px}
.notfound p{color:var(--ink-2);margin-bottom:24px;font-size:18px}

/* Responsive */
@media (max-width:920px){
  .hero-inner{grid-template-columns:1fr;gap:32px;padding:64px 0 60px}
  .hero h1{font-size:36px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:1fr}
  .grid-2,.about-grid,.contact-grid{grid-template-columns:1fr}
  .checklist{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{position:fixed;inset:68px 0 auto 0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:8px 24px 18px;display:none}
  .nav-links.open{display:flex}
  .nav-links li{padding:12px 0;border-bottom:1px solid var(--line);width:100%}
  .nav-toggle{display:flex}
  .cta{padding:40px 24px}
}
@media (max-width:520px){
  .stats{grid-template-columns:1fr 1fr}
  .hero h1{font-size:30px}
  .section-head h2{font-size:27px}
  .foot-grid{grid-template-columns:1fr}
}