:root{
  --c-bg:#0b1220;
  --c-surface:#111a2e;
  --c-surface-2:#16223b;
  --c-primary:#2f6bff;
  --c-primary-2:#1bd1a5;
  --c-text:#e8edf7;
  --c-muted:#9aa7bd;
  --c-border:#22304f;
  --radius:14px;
  --radius-lg:22px;
  --shadow:0 18px 50px rgba(0,0,0,.35);
  --maxw:1180px;
  --nav-h:66px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Source Sans Pro","PingFang SC","Microsoft YaHei",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  background:var(--c-bg);
  color:var(--c-text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.section{padding:96px 0;position:relative}
.section-head{text-align:center;max-width:680px;margin:0 auto 56px}
.section-tag{
  display:inline-block;font-size:13px;letter-spacing:2px;color:var(--c-primary-2);
  text-transform:uppercase;font-weight:700;margin-bottom:14px;
}
.section-title{font-size:34px;font-weight:700;letter-spacing:.5px;line-height:1.25}
.section-sub{color:var(--c-muted);margin-top:14px;font-size:17px}
.gradient-text{
  background:linear-gradient(90deg,var(--c-primary),var(--c-primary-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}

/* nav */
.nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:100;
  display:flex;align-items:center;
  background:rgba(11,18,32,.65);backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:all .3s var(--ease);
}
.nav.scrolled{border-bottom-color:var(--c-border);background:rgba(11,18,32,.85)}
.nav .container{display:flex;align-items:center;justify-content:space-between;width:100%}
.brand{font-size:19px;font-weight:800;letter-spacing:1px;white-space:nowrap;color:#fff}
.brand span{color:var(--c-primary-2)}
.nav-links{display:flex;gap:30px;align-items:center;list-style:none}
.nav-links a{font-size:15px;color:var(--c-muted);font-weight:500;transition:color .2s}
.nav-links a:hover{color:#fff}
.nav-cta{
  padding:9px 20px;border-radius:40px;font-size:14px;font-weight:600;
  background:linear-gradient(90deg,var(--c-primary),var(--c-primary-2));color:#fff;
}
.nav-toggle{display:none;background:none;border:0;color:#fff;font-size:24px;cursor:pointer}

/* hero */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  padding-top:var(--nav-h);overflow:hidden;
}
.hero-bg{
  position:absolute;inset:0;z-index:-2;
  background:
    radial-gradient(900px 600px at 80% 10%,rgba(47,107,255,.45),transparent 60%),
    radial-gradient(700px 500px at 10% 90%,rgba(27,209,165,.25),transparent 60%),
    linear-gradient(180deg,rgba(11,18,32,.82),rgba(10,15,28,.92)),
    url(../images/hero-city.jpg) center/cover no-repeat;
}
.hero-grid{
  position:absolute;inset:0;z-index:-1;opacity:.4;
  background-image:linear-gradient(rgba(47,107,255,.08) 1px,transparent 1px),
  linear-gradient(90deg,rgba(47,107,255,.08) 1px,transparent 1px);
  background-size:54px 54px;
  mask-image:radial-gradient(circle at 50% 40%,#000,transparent 75%);
}
.hero-inner{max-width:780px}
.hero h1{
  font-size:clamp(34px,5.4vw,60px);font-weight:800;line-height:1.12;letter-spacing:.5px;
  margin-bottom:22px;
}
.hero p{font-size:19px;color:var(--c-muted);max-width:620px;margin-bottom:36px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:40px;
  font-size:15px;font-weight:600;cursor:pointer;border:0;transition:transform .2s var(--ease),box-shadow .2s;
}
.btn-primary{background:linear-gradient(90deg,var(--c-primary),var(--c-primary-2));color:#fff;box-shadow:0 10px 30px rgba(47,107,255,.4)}
.btn-primary:hover{transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.06);color:#fff;border:1px solid var(--c-border)}
.btn-ghost:hover{background:rgba(255,255,255,.1)}
.hero-stats{display:flex;gap:42px;margin-top:60px;flex-wrap:wrap}
.hero-stat .num{font-size:30px;font-weight:800;color:#fff}
.hero-stat .lbl{font-size:13px;color:var(--c-muted);margin-top:2px}

/* services */
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{
  background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius-lg);
  padding:38px 30px;transition:transform .3s var(--ease),border-color .3s,box-shadow .3s;
}
.service-card:hover{transform:translateY(-6px);border-color:var(--c-primary);box-shadow:var(--shadow)}
.service-icon{
  width:58px;height:58px;border-radius:16px;display:grid;place-items:center;margin-bottom:22px;
  background:linear-gradient(135deg,rgba(47,107,255,.2),rgba(27,209,165,.2));
  border:1px solid var(--c-border);font-size:26px;
}
.service-card h3{font-size:21px;font-weight:700;margin-bottom:12px}
.service-card p{color:var(--c-muted);font-size:15px;margin-bottom:20px}
.service-link{color:var(--c-primary-2);font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:6px}
.service-link:hover{gap:10px}

/* solutions */
.solutions{background:linear-gradient(180deg,#0a0f1c,#0b1220)}
.sol-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.sol-card{
  position:relative;border-radius:var(--radius-lg);overflow:hidden;min-height:300px;
  display:flex;align-items:flex-end;border:1px solid var(--c-border);
  transition:transform .3s var(--ease),box-shadow .3s;
}
.sol-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.sol-thumb{
  position:absolute;inset:0;z-index:0;
  background-size:cover;background-position:center;
}
.sol-thumb::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(7,12,22,.35),rgba(7,12,22,.65));
}
.sol-body{position:relative;z-index:1;padding:28px;width:100%;background:linear-gradient(180deg,transparent,rgba(7,12,22,.92))}
.sol-body h3{font-size:20px;font-weight:700;margin-bottom:8px}
.sol-body p{color:var(--c-muted);font-size:14px}

/* counter */
.counter{background:var(--c-surface-2);border-top:1px solid var(--c-border);border-bottom:1px solid var(--c-border)}
.counter-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;text-align:center}
.counter-item .num{font-size:42px;font-weight:800;background:linear-gradient(90deg,var(--c-primary),var(--c-primary-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.counter-item .lbl{color:var(--c-muted);font-size:15px;margin-top:6px}

/* about */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:54px;align-items:center}
.about-media{
  border-radius:var(--radius-lg);min-height:360px;border:1px solid var(--c-border);
  background:url(../images/about-workspace.jpg) center/cover no-repeat;position:relative;overflow:hidden;
}
.about-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 40%,rgba(7,12,22,.5));
}
.about-text h2{font-size:32px;font-weight:700;margin-bottom:18px}
.about-text p{color:var(--c-muted);margin-bottom:26px}
.adv-list{list-style:none;display:grid;gap:16px}
.adv-list li{display:flex;gap:14px;align-items:flex-start}
.adv-list .dot{
  flex:none;width:30px;height:30px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,rgba(47,107,255,.25),rgba(27,209,165,.25));
  border:1px solid var(--c-border);color:var(--c-primary-2);font-weight:800;
}
.adv-list h4{font-size:16px;font-weight:600}
.adv-list p{color:var(--c-muted);font-size:14px;margin:2px 0 0}

/* cta banner */
.cta-banner{
  border-radius:var(--radius-lg);padding:64px 40px;text-align:center;position:relative;overflow:hidden;
  background:linear-gradient(135deg,rgba(22,49,125,.85),rgba(11,18,32,.92)),
    url(../images/bg-abstract.jpg) center/cover no-repeat;
  border:1px solid var(--c-border);
}
.cta-banner::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(500px 300px at 50% 0%,rgba(27,209,165,.3),transparent 70%);
}
.cta-banner h2{position:relative;font-size:30px;font-weight:700;margin-bottom:14px}
.cta-banner p{position:relative;color:var(--c-muted);margin-bottom:30px;font-size:17px}
.cta-banner .hero-cta{position:relative;justify-content:center}

/* footer */
.footer{border-top:1px solid var(--c-border);padding:60px 0 30px;background:#080d18}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer h4{font-size:16px;font-weight:700;margin-bottom:18px;color:#fff}
.footer p,.footer li{color:var(--c-muted);font-size:14px}
.footer ul{list-style:none;display:grid;gap:10px}
.footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid var(--c-border);padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px;color:var(--c-muted)}
.footer-bottom a{color:var(--c-muted)}
.footer-bottom a:hover{color:#fff}

/* responsive */
@media(max-width:1024px){
  .services-grid,.sol-grid{grid-template-columns:repeat(2,1fr)}
  .counter-grid{grid-template-columns:repeat(2,1fr);gap:34px}
  .about-grid{grid-template-columns:1fr;gap:34px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .section{padding:70px 0}
  .nav-links{
    position:fixed;top:var(--nav-h);right:0;width:240px;height:calc(100vh - var(--nav-h));
    background:rgba(11,18,32,.96);backdrop-filter:blur(14px);flex-direction:column;
    align-items:flex-start;padding:30px;gap:22px;border-left:1px solid var(--c-border);
    transform:translateX(100%);transition:transform .3s var(--ease);
  }
  .nav-links.open{transform:translateX(0)}
  .nav-toggle{display:block}
  .services-grid,.sol-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-stats{gap:28px}
}