:root{
  --bg:#f6f8fc;
  --bg-alt:#eef1f8;
  --surface:#ffffff;
  --ink:#0f172a;
  --muted:#5b6472;
  --line:#e6eaf2;
  --primary:#4f6ef7;
  --primary-2:#8b5cf6;
  --accent:#22d3ee;
  --grad:linear-gradient(135deg,#4f6ef7 0%,#8b5cf6 60%,#22d3ee 130%);
  --shadow:0 10px 30px rgba(79,110,247,.12);
  --shadow-lg:0 18px 50px rgba(79,110,247,.22);
  --radius:16px;
}

*{margin:0;padding:0;box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}

.container{max-width:1120px;margin:0 auto;padding:0 22px}

/* Header */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.85);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:700;font-size:18px}
.logo-mark{width:30px;height:30px;border-radius:9px;background:var(--grad);display:inline-block;position:relative}
.logo-mark::after{content:"";position:absolute;left:9px;top:7px;width:9px;height:14px;border-radius:4px 4px 6px 6px;background:#fff}
.logo-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.main-nav{display:flex;align-items:center;gap:26px}
.main-nav a{text-decoration:none;color:var(--muted);font-size:15px;transition:color .2s}
.main-nav a:hover{color:var(--primary)}
.main-nav .nav-buy{
  color:#fff;background:var(--grad);padding:8px 18px;border-radius:999px;
  box-shadow:0 6px 16px rgba(79,110,247,.3);font-weight:600;
}
.nav-toggle{display:none;background:none;border:none;font-size:26px;color:var(--ink);cursor:pointer;line-height:1}

/* Hero */
.hero{padding:70px 0 60px;background:
  radial-gradient(1200px 500px at 85% -10%,rgba(139,92,246,.18),transparent 60%),
  radial-gradient(900px 400px at -10% 20%,rgba(34,211,238,.14),transparent 60%),
  var(--bg);
  overflow:hidden;
}
.hero-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero-badge{
  display:inline-block;font-size:13px;color:var(--primary);
  background:rgba(79,110,247,.1);border:1px solid rgba(79,110,247,.22);
  padding:6px 14px;border-radius:999px;margin-bottom:18px;
}
.hero-text h1{font-size:44px;line-height:1.25;letter-spacing:-.5px;margin-bottom:18px}
.hero-sub{color:var(--muted);font-size:17px;max-width:520px;margin-bottom:28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:26px}
.hero-points{list-style:none;display:flex;gap:14px;flex-wrap:wrap}
.hero-points li{font-size:14px;color:var(--muted);padding-left:20px;position:relative}
.hero-points li::before{content:"";position:absolute;left:0;top:7px;width:10px;height:10px;border-radius:50%;background:var(--grad)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;font-weight:600;border-radius:12px;transition:transform .15s,box-shadow .2s;cursor:pointer}
.btn:hover{transform:translateY(-2px)}
.btn-primary{color:#fff;background:var(--grad);padding:14px 30px;font-size:16px;box-shadow:var(--shadow)}
.btn-primary:hover{box-shadow:var(--shadow-lg)}
.btn-ghost{color:var(--ink);background:var(--surface);border:1px solid var(--line);padding:14px 28px;font-size:16px}
.btn-lg{padding:16px 40px;font-size:17px}
.btn-card{width:100%;color:#fff;background:var(--grad);padding:12px 20px;font-size:15px;box-shadow:var(--shadow)}

/* Hero visual */
.hero-visual{display:flex;justify-content:center}
.visual-card{
  width:300px;background:var(--surface);border-radius:24px;box-shadow:var(--shadow-lg);
  padding:26px;position:relative;border:1px solid var(--line);
}
.visual-card::before{content:"";position:absolute;inset:-14px;border-radius:32px;background:var(--grad);opacity:.08;z-index:-1}
.visual-top{height:26px;border-radius:8px;background:var(--grad);margin-bottom:18px}
.visual-row{height:14px;border-radius:6px;background:var(--bg-alt);margin-bottom:12px}
.visual-row.short{width:60%}
.visual-app{height:70px;border-radius:14px;background:var(--bg-alt);margin-top:20px;display:flex;align-items:center;justify-content:center}
.visual-app::after{content:"App Store";color:var(--muted);font-size:14px}

/* Trust bar */
.trust-bar{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.trust-inner{display:grid;grid-template-columns:repeat(4,1fr);padding:26px 22px}
.trust-item{display:flex;flex-direction:column;align-items:center;gap:2px;text-align:center}
.trust-item strong{font-size:24px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.trust-item span{font-size:14px;color:var(--muted)}

/* Sections */
.section{padding:70px 0}
.section-alt{background:var(--bg-alt)}
.section-head{text-align:center;max-width:640px;margin:0 auto 46px}
.section-head h2{font-size:32px;margin-bottom:12px}
.section-head p{color:var(--muted);font-size:16px}

/* Products */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.product-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 22px;box-shadow:0 4px 16px rgba(15,23,42,.04);position:relative;
  display:flex;flex-direction:column;transition:transform .18s,box-shadow .2s;
}
.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.product-tag{
  position:absolute;top:-10px;right:16px;background:var(--grad);color:#fff;
  font-size:12px;padding:3px 12px;border-radius:999px;font-weight:600;
}
.product-card h3{font-size:18px;margin-bottom:10px}
.product-desc{color:var(--muted);font-size:14px;flex:1;margin-bottom:18px}
.product-price{font-size:30px;font-weight:800;margin-bottom:18px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.product-price span{font-size:18px}
.product-price em{font-size:14px;font-weight:500;color:var(--muted);font-style:normal;-webkit-text-fill-color:var(--muted)}

/* Features */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.feature-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px}
.feature-icon{width:52px;height:52px;border-radius:14px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px}
.feature-item h3{font-size:17px;margin-bottom:8px}
.feature-item p{color:var(--muted);font-size:14px}

/* Articles */
.article-list{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.article-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px}
.article-item h3{font-size:19px;margin-bottom:12px;color:var(--ink)}
.article-item p{color:var(--muted);font-size:15px}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto}
.faq-list details{background:var(--surface);border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq-list summary{cursor:pointer;padding:18px 22px;font-weight:600;font-size:16px;list-style:none;position:relative;padding-right:50px}
.faq-list summary::after{content:"+";position:absolute;right:22px;top:50%;transform:translateY(-50%);font-size:22px;color:var(--primary)}
.faq-list details[open] summary::after{content:"−"}
.faq-list details p{padding:0 22px 20px;color:var(--muted);font-size:15px}

/* CTA */
.cta-section{padding:40px 0 70px}
.cta-box{
  background:var(--grad);border-radius:24px;padding:56px 30px;text-align:center;
  box-shadow:var(--shadow-lg);color:#fff;
}
.cta-box h2{font-size:30px;margin-bottom:12px;color:#fff}
.cta-box p{font-size:16px;opacity:.9;margin-bottom:26px}
.cta-box .btn-primary{background:#fff;color:var(--primary);box-shadow:0 10px 26px rgba(0,0,0,.18)}
.cta-box .btn-primary:hover{box-shadow:0 16px 40px rgba(0,0,0,.24)}

/* Footer */
.site-footer{background:#0f172a;color:#cbd5e1;padding:50px 0 24px}
.footer-inner{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;margin-bottom:34px}
.footer-brand .logo-text{font-size:20px;font-weight:700}
.footer-brand p{font-size:14px;margin-top:10px;max-width:360px;color:#94a3b8}
.footer-links{display:flex;gap:24px;flex-wrap:wrap}
.footer-links a{color:#cbd5e1;text-decoration:none;font-size:14px;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;text-align:center;font-size:13px;color:#64748b}

/* Mobile CTA */
.mobile-cta{display:none;position:fixed;left:0;right:0;bottom:0;z-index:60;padding:12px 16px;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-top:1px solid var(--line)}
.mobile-cta .btn{width:100%}
body:has(.mobile-cta){padding-bottom:74px}

/* Responsive */
@media(max-width:960px){
  .product-grid,.feature-grid{grid-template-columns:repeat(2,1fr)}
  .article-list{grid-template-columns:1fr}
  .hero-inner{grid-template-columns:1fr}
  .hero-visual{display:none}
  .hero-text h1{font-size:36px}
}
@media(max-width:640px){
  .main-nav{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:14px 22px;gap:0;border-bottom:1px solid var(--line)}
  .main-nav.open{display:flex}
  .main-nav a{padding:13px 0;border-bottom:1px solid var(--line);font-size:16px}
  .main-nav a:last-child{border-bottom:none}
  .main-nav .nav-buy{margin-top:10px;text-align:center;color:#fff}
  .nav-toggle{display:block}
  .hero{padding:46px 0 44px}
  .hero-text h1{font-size:30px}
  .section{padding:48px 0}
  .section-head h2{font-size:26px}
  .product-grid,.feature-grid{grid-template-columns:1fr}
  .trust-inner{grid-template-columns:repeat(2,1fr);gap:18px}
  .mobile-cta{display:block}
  .footer-inner{flex-direction:column}
}