:root{
  --primary:#2f6bff;
  --primary-dark:#1e4fd6;
  --accent:#00c2a8;
  --grad:linear-gradient(135deg,#2f6bff 0%,#6a4dff 100%);
  --bg:#f6f8fc;
  --card:#ffffff;
  --text:#1a2233;
  --muted:#6b7488;
  --line:#e6eaf2;
  --radius:16px;
  --shadow:0 10px 30px rgba(31,54,120,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.7;font-size:15px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul,ol{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:80px 0}

/* Header */
.header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);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-size:20px;font-weight:700}
.brand img{width:38px;height:38px}
.brand span{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:15px;font-weight:500;color:#3a4458;position:relative;padding:6px 0;transition:color .2s}
.nav-links a:hover{color:var(--primary)}
.nav-links a.active{color:var(--primary);font-weight:600}
.nav-links a.active::after{content:"";position:absolute;left:0;bottom:-4px;width:100%;height:3px;border-radius:3px;background:var(--grad)}
.nav-cta{display:inline-flex;align-items:center;gap:6px;padding:10px 22px;border-radius:50px;background:var(--grad);color:#fff;font-weight:600;font-size:14px;transition:transform .2s,box-shadow .2s}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(47,107,255,.35)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:#333;border-radius:2px;transition:.3s}

/* Hero */
.hero{position:relative;overflow:hidden;background:radial-gradient(1200px 600px at 80% -10%,rgba(106,77,255,.16),transparent 60%),radial-gradient(900px 500px at 10% 10%,rgba(47,107,255,.12),transparent 55%),#fff}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:50px;align-items:center;padding:70px 0}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:#eef3ff;color:var(--primary);font-size:13px;font-weight:600;padding:7px 16px;border-radius:50px;margin-bottom:22px}
.hero h1{font-size:46px;line-height:1.22;font-weight:800;letter-spacing:-.5px}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p.lead{font-size:17px;color:var(--muted);margin:20px 0 30px;max-width:520px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;align-items:center}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 30px;border-radius:50px;font-size:16px;font-weight:600;cursor:pointer;border:none;transition:transform .2s,box-shadow .2s,background .2s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 24px rgba(47,107,255,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(47,107,255,.42)}
.btn-ghost{background:#fff;color:var(--primary);border:2px solid var(--line)}
.btn-ghost:hover{border-color:var(--primary);transform:translateY(-2px)}
.hero-meta{display:flex;gap:28px;margin-top:34px;color:var(--muted);font-size:13px}
.hero-meta b{display:block;font-size:22px;color:var(--text);font-weight:700}

/* Simulator mockup */
.sim{position:relative}
.sim-glow{position:absolute;inset:-20px;background:var(--grad);filter:blur(60px);opacity:.25;border-radius:30px;z-index:0}
.sim-window{position:relative;z-index:1;background:#fff;border-radius:18px;box-shadow:0 30px 60px rgba(31,54,120,.2);overflow:hidden;border:1px solid #eef0f6}
.sim-titlebar{display:flex;align-items:center;gap:8px;padding:12px 16px;background:linear-gradient(180deg,#fafbfe,#f1f4fb);border-bottom:1px solid var(--line)}
.sim-dot{width:12px;height:12px;border-radius:50%}
.sim-dot.r{background:#ff5f57}.sim-dot.y{background:#febc2e}.sim-dot.g{background:#28c840}
.sim-title{flex:1;text-align:center;font-size:12px;color:var(--muted)}
.sim-body{display:grid;grid-template-columns:190px 1fr;height:420px}
.sim-sidebar{background:#f4f7ff;border-right:1px solid var(--line);padding:12px 8px;display:flex;flex-direction:column;gap:4px;overflow:hidden}
.sim-avatar{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:14px;flex-shrink:0}
.sim-contact{display:flex;align-items:center;gap:10px;padding:8px;border-radius:10px;cursor:pointer;transition:background .15s}
.sim-contact:hover,.sim-contact.on{background:#e8eeff}
.sim-contact .info{flex:1;min-width:0}
.sim-contact .info b{font-size:13px;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sim-contact .info span{font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
.sim-chat{display:flex;flex-direction:column;background:#fff}
.sim-chat-head{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line)}
.sim-chat-head b{font-size:14px}
.sim-chat-head span{font-size:12px;color:var(--accent)}
.sim-msgs{flex:1;padding:16px;display:flex;flex-direction:column;gap:12px;overflow:hidden;background:#fbfcff}
.msg{max-width:75%;padding:10px 14px;border-radius:14px;font-size:13px;line-height:1.5;position:relative}
.msg.in{background:#fff;border:1px solid var(--line);border-bottom-left-radius:4px;align-self:flex-start}
.msg.out{background:var(--grad);color:#fff;border-bottom-right-radius:4px;align-self:flex-end}
.msg .t{font-size:10px;color:var(--muted);margin-top:4px}
.msg.out .t{color:rgba(255,255,255,.8)}
.sim-input{display:flex;align-items:center;gap:8px;padding:12px;border-top:1px solid var(--line)}
.sim-input input{flex:1;border:1px solid var(--line);border-radius:20px;padding:9px 16px;font-size:13px;outline:none}
.sim-input button{width:38px;height:38px;border-radius:50%;background:var(--grad);color:#fff;border:none;cursor:pointer;font-size:16px}
.sim-float{position:absolute;z-index:2;background:#fff;border-radius:12px;box-shadow:0 12px 30px rgba(31,54,120,.16);padding:10px 14px;font-size:12px;display:flex;align-items:center;gap:8px;border:1px solid #eef0f6}
.sim-float.f1{top:6%;right:-30px;animation:floaty 5s ease-in-out infinite}
.sim-float.f2{bottom:12%;left:-36px;animation:floaty 6s ease-in-out infinite .6s}
.sim-float .ic{width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* Section headers */
.sec-head{text-align:center;max-width:680px;margin:0 auto 50px}
.sec-head .tag{display:inline-block;font-size:13px;font-weight:600;color:var(--primary);background:#eef3ff;padding:6px 16px;border-radius:50px;margin-bottom:14px}
.sec-head h2{font-size:34px;font-weight:800;line-height:1.25}
.sec-head p{color:var(--muted);margin-top:14px;font-size:16px}

/* Features */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.card .ico{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:18px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:14px}
.ico.blue{background:#e8efff;color:#2f6bff}
.ico.green{background:#e5f8f4;color:#00c2a8}
.ico.purple{background:#f0ecff;color:#7a5cff}
.ico.orange{background:#fff3e5;color:#ff8c1a}
.ico.pink{background:#ffeaf3;color:#ff4d8d}
.ico.cyan{background:#e5f7ff;color:#17a2ff}

/* Feature highlight rows */
.highlight{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.highlight.rev .h-media{order:2}
.highlight .h-txt h3{font-size:28px;margin-bottom:16px;font-weight:800}
.highlight .h-txt p{color:var(--muted);margin-bottom:18px}
.highlight .h-txt ul li{position:relative;padding-left:26px;margin-bottom:10px;color:#3a4458}
.highlight .h-txt ul li::before{content:"✓";position:absolute;left:0;top:0;color:var(--accent);font-weight:700}
.h-media{background:linear-gradient(135deg,#eef3ff,#f6f1ff);border-radius:20px;padding:30px;display:flex;align-items:center;justify-content:center;min-height:280px}

/* Stats band */
.stats{background:var(--grad);color:#fff;padding:60px 0}
.stats .container{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;text-align:center}
.stats .num{font-size:42px;font-weight:800}
.stats .lbl{font-size:14px;opacity:.85;margin-top:4px}

/* FAQ */
.faq-cat{margin-bottom:46px}
.faq-cat-title{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:700;margin-bottom:18px}
.faq-cat-title .n{width:34px;height:34px;border-radius:10px;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;flex-shrink:0}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:12px;overflow:hidden}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:18px 22px;font-size:16px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:16px;color:var(--text)}
.faq-q .arrow{transition:transform .3s;color:var(--primary);font-size:18px}
.faq-item.open .arrow{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-item.open .faq-a{max-height:600px}
.faq-a-inner{padding:0 22px 20px;color:#3a4458;font-size:14.5px}
.faq-a-inner ol{padding-left:20px;margin-top:8px}
.faq-a-inner ol li{margin-bottom:8px;list-style:decimal}
.faq-a-inner ol li b{color:var(--primary)}

/* Download page */
.dl-hero{text-align:center;padding:70px 0 40px}
.dl-hero h1{font-size:40px;font-weight:800}
.dl-hero p{color:var(--muted);font-size:17px;margin-top:14px}
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:50px}
.dl-card{text-align:center;padding:36px 24px}
.dl-card .plat{font-size:44px;margin-bottom:14px}
.dl-card h3{font-size:20px;margin-bottom:8px}
.dl-card p{color:var(--muted);font-size:13.5px;margin-bottom:20px;min-height:60px}
.dl-card .ver{display:inline-block;font-size:12px;background:#f2f5fb;color:var(--muted);padding:4px 12px;border-radius:20px;margin-bottom:18px}
.dl-meta{max-width:720px;margin:0 auto 60px}
.dl-meta .row{display:flex;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--line);font-size:14px}
.dl-meta .row span:last-child{color:var(--muted)}

/* Sitemap */
.sitemap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sitemap-col{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.sitemap-col h3{font-size:17px;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--line);color:var(--primary)}
.sitemap-col a{display:block;padding:8px 0;color:#3a4458;font-size:14px;border-bottom:1px dashed var(--line)}
.sitemap-col a:hover{color:var(--primary);padding-left:6px;transition:.2s}

/* About */
.about-hero{padding:60px 0 30px;text-align:center}
.about-hero h1{font-size:38px;font-weight:800}
.about-hero p{color:var(--muted);margin-top:12px;font-size:16px}
.about-body{max-width:860px;margin:0 auto}
.about-body p{color:#3a4458;margin-bottom:16px}

/* CTA */
.cta{background:var(--grad);border-radius:24px;padding:60px;text-align:center;color:#fff;position:relative;overflow:hidden}
.cta h2{font-size:32px;font-weight:800}
.cta p{opacity:.9;margin:14px 0 28px;font-size:16px}
.cta .btn{background:#fff;color:var(--primary)}

/* Footer */
.footer{background:#121a2e;color:#aab2c5;padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer .f-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer .f-brand img{width:36px;height:36px}
.footer .f-brand span{color:#fff;font-size:19px;font-weight:700}
.footer p{font-size:13.5px;line-height:1.8}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.footer-links a{display:block;font-size:13.5px;color:#aab2c5;padding:5px 0;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-bottom{padding:22px 0;display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center}
.footer-bottom p{font-size:13px;color:#7c859a}
.friend-links{width:100%;text-align:center}
#my-friend-links{font-size:13px;color:#7c859a}
#my-friend-links a{color:#9aa5bd;margin:0 6px}
#my-friend-links a:hover{color:#fff}

/* Responsive */
@media(max-width:960px){
  .hero-inner{grid-template-columns:1fr;padding:50px 0}
  .grid,.grid-2,.grid-4,.dl-grid,.sitemap-grid{grid-template-columns:1fr 1fr}
  .highlight{grid-template-columns:1fr;gap:30px}
  .highlight.rev .h-media{order:0}
  .footer-grid{grid-template-columns:1fr 1fr}
  .nav-links{position:fixed;inset:68px 0 auto 0;background:#fff;flex-direction:column;padding:20px;gap:0;border-bottom:1px solid var(--line);display:none;box-shadow:0 20px 40px rgba(0,0,0,.06)}
  .nav-links.open{display:flex}
  .nav-links a{padding:14px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav-cta{display:none}
  .nav-toggle{display:flex}
  .sim-float{display:none}
}
@media(max-width:600px){
  .grid,.grid-2,.grid-4,.dl-grid,.sitemap-grid{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .sec-head h2{font-size:26px}
  .stats .container{grid-template-columns:1fr 1fr}
  .sim-body{grid-template-columns:1fr}
  .sim-sidebar{display:none}
}