:root{
  --blue:#2563eb;
  --cyan:#06b6d4;
  --ink:#0f172a;
  --ink-2:#1e293b;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#ffffff;
  --bg-soft:#f8fafc;
  --grad:linear-gradient(135deg,#2563eb 0%,#06b6d4 100%);
  --shadow:0 10px 30px -12px rgba(37,99,235,.35);
  --radius:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink-2);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.container{max-width:1140px;margin:0 auto;padding:0 20px}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);
  backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.brand-name{font-size:19px;letter-spacing:.5px}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{color:var(--muted);font-size:15px;font-weight:500;transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:22px;height:2px;background:var(--ink);border-radius:2px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:999px;font-weight:600;font-size:15px;cursor:pointer;
  border:1px solid transparent;transition:transform .15s,box-shadow .2s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--shadow)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.nav-cta{padding:8px 18px}

/* ===== Hero ===== */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(1200px 500px at 80% -10%,rgba(6,182,212,.18),transparent 60%),
  radial-gradient(900px 500px at 0% 10%,rgba(37,99,235,.16),transparent 55%),
  var(--bg-soft)}
.hero-inner{padding:80px 0 90px;text-align:center}
.hero-logo{margin-bottom:22px}
.hero-logo img{height:120px;width:auto;filter:drop-shadow(0 12px 24px rgba(37,99,235,.18))}
.eyebrow{display:inline-block;padding:6px 14px;border-radius:999px;background:#eef4ff;
  color:var(--blue);font-size:13px;font-weight:600;margin-bottom:22px}
.hero h1{font-size:clamp(34px,5vw,56px);line-height:1.15;letter-spacing:-.5px;color:var(--ink)}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{max-width:640px;margin:22px auto 0;color:var(--muted);font-size:18px}
.hero-cta{display:flex;gap:14px;justify-content:center;margin-top:34px;flex-wrap:wrap}

/* Hero stats - separated cards */
.hero-stats{display:flex;gap:0;justify-content:center;margin-top:56px;flex-wrap:wrap;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 12px;
  box-shadow:0 4px 20px -8px rgba(15,23,42,.08);max-width:840px;margin-left:auto;margin-right:auto}
.stat{flex:1 1 140px;padding:10px 18px;text-align:center;min-width:130px}
.stat:not(:last-child){border-right:1px solid var(--line)}
.stat .num{font-size:clamp(26px,3vw,34px);font-weight:800;background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.1}
.stat .label{font-size:14px;color:var(--muted);margin-top:8px}

/* ===== Sections ===== */
section{padding:84px 0}
.section-head{text-align:center;max-width:680px;margin:0 auto 52px}
.section-head .tag{color:var(--cyan);font-weight:700;font-size:14px;letter-spacing:1px}
.section-head h2{font-size:clamp(26px,3.4vw,38px);margin:10px 0 14px;color:var(--ink)}
.section-head p{color:var(--muted);font-size:16px}

/* About */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.about-copy h2{font-size:clamp(26px,3vw,36px);color:var(--ink);margin-bottom:18px}
.about-copy p{color:var(--muted);margin-bottom:16px;font-size:16px}
.about-points{display:grid;gap:14px;margin-top:24px}
.about-points li{list-style:none;display:flex;gap:12px;align-items:flex-start;font-size:15px}
.about-points .dot{flex:0 0 24px;width:24px;height:24px;border-radius:50%;background:var(--grad);
  color:#fff;display:grid;place-items:center;margin-top:2px}
.about-points .dot svg{width:14px;height:14px;stroke-width:2.5}
.about-card{background:var(--ink);color:#e2e8f0;border-radius:var(--radius);padding:34px;
  box-shadow:var(--shadow)}
.about-card h3{color:#fff;font-size:20px;margin-bottom:14px}
.about-card ul{list-style:none;display:grid;gap:12px}
.about-card li{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid rgba(255,255,255,.1);font-size:14px}
.about-card li span:last-child{color:#7dd3fc;font-weight:600}

/* Features */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;transition:transform .2s,box-shadow .2s,border-color .2s}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.feature .ico{width:46px;height:46px;border-radius:12px;background:#eef4ff;display:grid;place-items:center;
  color:var(--blue);margin-bottom:16px}
.feature .ico svg{width:22px;height:22px}
.feature h3{font-size:18px;color:var(--ink);margin-bottom:8px}
.feature p{color:var(--muted);font-size:14.5px}

/* Scenes */
.scenes-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.scene{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;text-align:center}
.scene .scene-ico{color:var(--blue);margin:0 auto 10px;display:inline-grid;place-items:center;
  width:52px;height:52px;border-radius:14px;background:#eef4ff}
.scene h3{font-size:16px;color:var(--ink);margin:6px 0 6px}
.scene p{color:var(--muted);font-size:13.5px}

/* Download CTA band */
.cta-band{background:var(--grad);color:#fff;border-radius:24px;padding:56px 40px;text-align:center;margin:0 20px}
.cta-band h2{color:#fff;font-size:30px;margin-bottom:12px}
.cta-band p{max-width:520px;margin:0 auto 26px;opacity:.92}
.cta-band .btn-ghost{background:#fff;color:var(--blue)}

/* ===== Download page ===== */
.dl-hero{padding:80px 0 40px;text-align:center}
.dl-hero h1{font-size:clamp(30px,4vw,44px);color:var(--ink)}
.dl-hero p{color:var(--muted);margin-top:14px;font-size:17px}
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:46px}
.dl-card{border:1px solid var(--line);border-radius:var(--radius);padding:30px;text-align:center;background:var(--bg)}
.dl-card .badge{font-size:30px;margin-bottom:12px;display:grid;place-items:center;height:50px;color:var(--blue)}
.dl-card h3{color:var(--ink);font-size:19px;margin-bottom:6px}
.dl-card .meta{color:var(--muted);font-size:13.5px;min-height:40px}
.dl-card .qr{width:160px;height:160px;margin:18px auto;border:1px solid var(--line);border-radius:12px;
  display:grid;place-items:center;background:var(--bg-soft);color:var(--muted);font-size:13px;text-align:center;overflow:hidden}
.dl-card .qr img{width:100%;height:100%;object-fit:contain}
.dl-card .qr.dl-icon-placeholder{color:var(--blue);background:#eef4ff}
.dl-card .qr.dl-icon-placeholder svg{width:56px;height:56px}
.dl-card .btn{width:100%;margin-top:8px}
.dl-note{margin-top:30px;text-align:center;color:var(--muted);font-size:14px}
.dl-note code{background:var(--bg-soft);padding:2px 8px;border-radius:6px;border:1px solid var(--line)}

/* ===== Footer ===== */
.site-footer{background:var(--ink);color:#cbd5e1;margin-top:40px;padding:56px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px}
.site-footer .brand-name{color:#fff}
.footer-desc{color:#94a3b8;font-size:14px;margin-top:12px;max-width:280px}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer-col a,.footer-col p{display:block;color:#94a3b8;font-size:14px;margin-bottom:9px}
.footer-col a:hover{color:#7dd3fc}
.footer-bottom{display:flex;justify-content:space-between;margin-top:36px;padding-top:20px;
  border-top:1px solid rgba(255,255,255,.1);color:#64748b;font-size:13px;flex-wrap:wrap;gap:8px}

/* ===== Responsive ===== */
@media (max-width:900px){
  .about-grid{grid-template-columns:1fr}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .scenes-grid{grid-template-columns:repeat(2,1fr)}
  .dl-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stat:not(:last-child){border-right:none;border-bottom:1px solid var(--line)}
  .hero-stats{gap:8px 0}
}
@media (max-width:640px){
  .nav-links{position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;
    align-items:stretch;gap:0;padding:10px 20px 18px;border-bottom:1px solid var(--line);
    display:none}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0;border-bottom:1px solid var(--line)}
  .nav-toggle{display:flex}
  .nav-cta{margin-top:10px}
  .features-grid,.scenes-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-inner{padding:60px 0 56px}
  .hero-logo img{height:90px}
  .stat{flex:1 1 120px;padding:14px 10px}
  .stat:not(:last-child){border-right:none;border-bottom:1px solid var(--line)}
}

.brand-logo-img{height:40px;width:auto;display:block}