:root{
  --ink:#151827;
  --ink2:#454B63;
  --ink3:#7A8199;
  --bg:#F5F6FB;
  --card:#FFFFFF;
  --line:#E5E7F2;
  --brand:#5B4CDB;
  --brand-d:#3F31BD;
  --brand-l:#EDEAFF;
  --teal:#0FA99B;
  --teal-l:#E2F7F4;
  --violet:#8A5CF6;
  --gold:#E8912F;
  --gold-l:#FDF1DF;
  --grad:linear-gradient(128deg,#5B4CDB 0%,#8A5CF6 52%,#0FA99B 100%);
  --shadow-s:0 2px 8px rgba(21,24,39,.05);
  --shadow-m:0 10px 30px rgba(21,24,39,.08);
  --shadow-l:0 24px 60px rgba(63,49,189,.16);
  --r-s:12px;
  --r-m:18px;
  --r-l:26px;
  --max:1180px;
}

*{margin:0;padding:0;box-sizing:border-box}
h1,h2,h3,h4,[id]{scroll-margin-top:92px}
html{scroll-behavior:smooth}
body{
  font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}

.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 28px;border-radius:100px;font-size:16px;font-weight:700;
  border:0;cursor:pointer;transition:.22s ease;white-space:nowrap;
}
.btn-main{background:var(--grad);color:#fff;box-shadow:0 10px 24px rgba(91,76,219,.32)}
.btn-main:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(91,76,219,.4)}
.btn-ghost{background:#fff;color:var(--brand-d);border:1.5px solid var(--line);box-shadow:var(--shadow-s)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}
.btn-s{padding:9px 20px;font-size:14px}

/* ---------- header ---------- */
.hd{
  position:sticky;top:0;z-index:80;
  background:rgba(255,255,255,.86);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.hd-in{display:flex;align-items:center;gap:18px;height:70px}
.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand img{width:38px;height:38px;border-radius:11px;box-shadow:var(--shadow-s)}
.brand b{font-size:21px;letter-spacing:.5px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav a{padding:9px 15px;border-radius:100px;font-size:15px;color:var(--ink2);font-weight:600;transition:.2s}
.nav a:hover{background:var(--brand-l);color:var(--brand-d)}
.nav a.on{background:var(--brand-l);color:var(--brand-d)}
.hd .btn{margin-left:8px}
.burger{display:none;margin-left:auto;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:#fff;cursor:pointer;position:relative}
.burger i{position:absolute;left:11px;width:20px;height:2px;background:var(--ink);border-radius:2px;transition:.25s}
.burger i:nth-child(1){top:14px}
.burger i:nth-child(2){top:20px}
.burger i:nth-child(3){top:26px}
.burger.act i:nth-child(1){top:20px;transform:rotate(45deg)}
.burger.act i:nth-child(2){opacity:0}
.burger.act i:nth-child(3){top:20px;transform:rotate(-45deg)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:64px 0 74px;background:
  radial-gradient(900px 420px at 88% -8%,rgba(138,92,246,.16),transparent 62%),
  radial-gradient(700px 380px at 4% 8%,rgba(15,169,155,.15),transparent 60%),#fff}
.hero-in{display:grid;grid-template-columns:1.06fr .94fr;gap:50px;align-items:center}
.chip{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border-radius:100px;background:var(--brand-l);color:var(--brand-d);font-size:13.5px;font-weight:700}
.chip s{width:7px;height:7px;border-radius:50%;background:var(--teal);text-decoration:none}
.hero h1{font-size:47px;line-height:1.22;letter-spacing:-.5px;margin:20px 0 16px;font-weight:800}
.hero h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:17px;color:var(--ink2);max-width:520px}
.hero-act{display:flex;flex-wrap:wrap;gap:13px;margin:30px 0 22px}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px}
.hero-meta span{display:inline-flex;align-items:center;gap:7px;font-size:13.5px;color:var(--ink2);background:#fff;border:1px solid var(--line);padding:6px 13px;border-radius:100px;box-shadow:var(--shadow-s)}
.hero-meta b{color:var(--brand-d)}

.phones{position:relative;display:flex;justify-content:center;align-items:flex-end;min-height:430px}
.phone{position:relative;z-index:2;width:238px;border-radius:32px;padding:9px;background:#161A2B;box-shadow:var(--shadow-l)}
.phone img{border-radius:24px;width:100%}
.phone.small{position:absolute;width:176px;right:2px;bottom:-14px;z-index:3;background:#20243A}
.float{position:absolute;z-index:4;left:0;top:26px;background:#fff;border-radius:16px;padding:13px 16px;box-shadow:var(--shadow-m);border:1px solid var(--line)}
.float b{display:block;font-size:19px;color:var(--brand-d);line-height:1.2}
.float i{font-style:normal;font-size:12.5px;color:var(--ink3)}
.float.f2{top:auto;bottom:64px;left:-6px}

/* ---------- stats ---------- */
.stats{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats-in{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:30px 0}
.stat{text-align:center;padding:6px 10px}
.stat b{display:block;font-size:29px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:-.5px}
.stat i{font-style:normal;font-size:13.5px;color:var(--ink3)}

/* ---------- section ---------- */
.sec{padding:76px 0}
.sec.alt{background:#fff}
.sec-h{max-width:720px;margin-bottom:40px}
.sec-h.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-h h2{font-size:32px;font-weight:800;letter-spacing:-.4px;line-height:1.3}
.sec-h p{color:var(--ink2);margin-top:12px;font-size:16.5px}
.tag{display:inline-block;font-size:13px;font-weight:800;letter-spacing:2px;color:var(--brand);text-transform:uppercase;margin-bottom:12px}

/* ---------- feature grid ---------- */
.fgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.fcard{background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);padding:26px 24px;box-shadow:var(--shadow-s);transition:.24s;position:relative;overflow:hidden}
.fcard:hover{transform:translateY(-5px);box-shadow:var(--shadow-m);border-color:#D9D4FB}
.fcard::after{content:"";position:absolute;inset:0 auto 0 0;width:4px;background:var(--grad);opacity:0;transition:.24s}
.fcard:hover::after{opacity:1}
.fico{width:48px;height:48px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;color:#fff;background:var(--grad);margin-bottom:16px}
.fcard:nth-child(2n) .fico{background:linear-gradient(135deg,#0FA99B,#5B4CDB)}
.fcard:nth-child(3n) .fico{background:linear-gradient(135deg,#8A5CF6,#E8912F)}
.fcard h3{font-size:18.5px;font-weight:700;margin-bottom:9px}
.fcard p{color:var(--ink2);font-size:15px}
.fcard a{display:inline-block;margin-top:12px;font-size:14px;font-weight:700;color:var(--brand-d)}
.fcard a:hover{text-decoration:underline}

/* ---------- screenshots ---------- */
.shots{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.shot{background:#fff;border:1px solid var(--line);border-radius:var(--r-m);padding:13px;box-shadow:var(--shadow-s);transition:.24s}
.shot:hover{transform:translateY(-5px);box-shadow:var(--shadow-m)}
.shot .ph{border-radius:13px;overflow:hidden;background:#0E1120}
.shot .ph img{width:100%;height:auto}
.shot h4{font-size:15px;font-weight:700;margin:13px 0 4px}
.shot p{font-size:13.5px;color:var(--ink3);line-height:1.65}

/* ---------- topic entries ---------- */
.tgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tcard{display:block;border-radius:var(--r-l);padding:32px 28px;color:#fff;background:linear-gradient(150deg,#5B4CDB,#8A5CF6);box-shadow:var(--shadow-m);transition:.24s;position:relative;overflow:hidden}
.tcard:nth-child(2){background:linear-gradient(150deg,#0FA99B,#5B4CDB)}
.tcard:nth-child(3){background:linear-gradient(150deg,#8A5CF6,#E8912F)}
.tcard:hover{transform:translateY(-6px);box-shadow:var(--shadow-l)}
.tcard b{display:block;font-size:12.5px;letter-spacing:2px;opacity:.8;font-weight:700}
.tcard h3{font-size:23px;font-weight:800;margin:12px 0 10px}
.tcard p{font-size:14.5px;opacity:.92;line-height:1.7}
.tcard s{display:inline-block;margin-top:18px;font-size:15px;font-weight:800;text-decoration:none;border-bottom:2px solid rgba(255,255,255,.6);padding-bottom:3px}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:s}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--r-m);padding:26px 22px;box-shadow:var(--shadow-s);position:relative}
.step u{text-decoration:none;display:flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:12px;background:var(--brand-l);color:var(--brand-d);font-weight:800;font-size:17px;margin-bottom:14px}
.step h3{font-size:17px;font-weight:700;margin-bottom:8px}
.step p{font-size:14.5px;color:var(--ink2)}

/* ---------- reviews ---------- */
.rgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.rev{background:#fff;border:1px solid var(--line);border-radius:var(--r-m);padding:26px 24px;box-shadow:var(--shadow-s)}
.rev .stars{color:var(--gold);font-size:15px;letter-spacing:2px;margin-bottom:12px}
.rev p{color:var(--ink2);font-size:15px}
.rev .who{display:flex;align-items:center;gap:11px;margin-top:18px;padding-top:16px;border-top:1px dashed var(--line)}
.rev .av{width:38px;height:38px;border-radius:50%;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px}
.rev .who b{display:block;font-size:14.5px}
.rev .who i{font-style:normal;font-size:12.5px;color:var(--ink3)}

/* ---------- faq ---------- */
.faq{max-width:860px;margin:0 auto}
.qa{border:1px solid var(--line);border-radius:var(--r-m);background:#fff;margin-bottom:12px;overflow:hidden;box-shadow:var(--shadow-s)}
.qa>button{width:100%;display:flex;align-items:center;gap:14px;text-align:left;padding:19px 22px;background:none;border:0;cursor:pointer;font-family:inherit;font-size:16.5px;font-weight:700;color:var(--ink)}
.qa>button s{text-decoration:none;flex-shrink:0;width:26px;height:26px;border-radius:8px;background:var(--brand-l);color:var(--brand-d);display:flex;align-items:center;justify-content:center;font-size:17px;transition:.24s;font-weight:800}
.qa.open>button s{transform:rotate(45deg);background:var(--brand);color:#fff}
.qa .ans{max-height:0;overflow:hidden;transition:max-height .3s ease}
.qa .ans div{padding:0 22px 20px 62px;color:var(--ink2);font-size:15.3px}
.qa .ans a{color:var(--brand-d);font-weight:700;border-bottom:1px solid rgba(91,76,219,.35)}

/* ---------- download band ---------- */
.band{background:var(--grad);border-radius:var(--r-l);padding:52px 46px;color:#fff;display:grid;grid-template-columns:1fr auto;gap:34px;align-items:center;box-shadow:var(--shadow-l)}
.band h2{font-size:31px;font-weight:800;line-height:1.3}
.band p{margin-top:12px;font-size:16px;opacity:.94;max-width:560px}
.band .btn{background:#fff;color:var(--brand-d);box-shadow:0 12px 26px rgba(0,0,0,.16)}
.band .btn:hover{transform:translateY(-2px)}
.band .note{margin-top:14px;font-size:13px;opacity:.85}
.band-side{text-align:center}

/* ---------- page head (inner) ---------- */
.phead{background:
  radial-gradient(700px 320px at 82% -30%,rgba(138,92,246,.18),transparent 60%),
  radial-gradient(560px 300px at 8% 0%,rgba(15,169,155,.16),transparent 58%),#fff;
  border-bottom:1px solid var(--line);padding:52px 0 46px}
.crumb{font-size:13.5px;color:var(--ink3);margin-bottom:14px}
.crumb a:hover{color:var(--brand-d)}
.phead h1{font-size:38px;font-weight:800;letter-spacing:-.5px;line-height:1.28}
.phead .lead{margin-top:14px;font-size:17px;color:var(--ink2);max-width:780px}

/* ---------- article ---------- */
.art{background:#fff;border:1px solid var(--line);border-radius:var(--r-l);padding:44px 46px;box-shadow:var(--shadow-s)}
.art h2{font-size:26px;font-weight:800;margin:38px 0 14px;letter-spacing:-.3px;line-height:1.35}
.art h2:first-child{margin-top:0}
.art h3{font-size:19px;font-weight:700;margin:26px 0 10px}
.art p{color:var(--ink2);margin-bottom:14px}
.art ul,.art ol{margin:0 0 16px 0}
.art ul li,.art ol li{color:var(--ink2);position:relative;padding-left:24px;margin-bottom:9px}
.art ul li::before{content:"";position:absolute;left:4px;top:11px;width:8px;height:8px;border-radius:3px;background:var(--grad)}
.art ol{counter-reset:o}
.art ol li{counter-increment:o}
.art ol li::before{content:counter(o);position:absolute;left:0;top:3px;width:19px;height:19px;border-radius:6px;background:var(--brand-l);color:var(--brand-d);font-size:12px;font-weight:800;display:flex;align-items:center;justify-content:center}
.art strong{color:var(--ink)}
.art a{color:var(--brand-d);font-weight:700;border-bottom:1px solid rgba(91,76,219,.35)}
.art a:hover{border-bottom-color:var(--brand-d)}
.callout{background:var(--teal-l);border-left:4px solid var(--teal);border-radius:0 var(--r-s) var(--r-s) 0;padding:18px 22px;margin:20px 0}
.callout p{margin:0;color:#0A6C63;font-size:15px}
.tbar{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.tbar a{display:inline-flex;align-items:center;gap:7px;padding:9px 17px;border-radius:100px;background:var(--bg);border:1px solid var(--line);font-size:14px;font-weight:700;color:var(--ink2);border-bottom:1px solid var(--line)}
.tbar a:hover{background:var(--brand-l);color:var(--brand-d);border-color:#D9D4FB}

/* ---------- footer ---------- */
.ft{background:#141728;color:#A9AFC6;padding:54px 0 28px;margin-top:8px}
.ft-in{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:34px}
.ft .brand b{background:linear-gradient(128deg,#8A5CF6,#38D6C4);-webkit-background-clip:text;background-clip:text;color:transparent;font-size:20px}
.ft .brand img{box-shadow:none}
.ft p{font-size:14px;line-height:1.8}
.ft .ft-intro{margin-top:24px}
.ft-in > div:last-child li{font-size:14px}
.ft h4{color:#fff;font-size:15px;font-weight:700;margin-bottom:14px}
.ft li{margin-bottom:9px}
.ft li a{font-size:14px}
.ft li a:hover{color:#fff}
.disc{margin-top:34px;padding:18px 22px;background:rgba(255,255,255,.05);border-radius:var(--r-m);font-size:13.5px;line-height:1.8;color:#9299B4}
.copy{margin-top:22px;padding-top:20px;border-top:1px solid rgba(255,255,255,.09);font-size:13.5px;color:#7F869F;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between}

/* ---------- to top ---------- */
.totop{position:fixed;right:22px;bottom:24px;width:46px;height:46px;border-radius:14px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-m);cursor:pointer;opacity:0;pointer-events:none;transition:.25s;z-index:70;font-size:18px;color:var(--brand-d);font-weight:800}
.totop.show{opacity:1;pointer-events:auto}
.totop:hover{background:var(--brand-l)}

/* ---------- reveal ---------- */
html.js-anim .rv{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
html.js-anim .rv.in{opacity:1;transform:none}

/* ---------- lightbox ---------- */
.lb{position:fixed;inset:0;background:rgba(12,14,26,.86);display:none;align-items:center;justify-content:center;z-index:120;padding:30px}
.lb.show{display:flex}
.lb img{max-height:88vh;max-width:92vw;border-radius:16px;box-shadow:0 30px 80px rgba(0,0,0,.5)}
.lb .x{position:absolute;top:22px;right:26px;width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.14);color:#fff;border:0;font-size:22px;cursor:pointer}
.shot .ph{cursor:zoom-in}

@media (max-width:1080px){
  .hero h1{font-size:40px}
  .fgrid,.tgrid,.rgrid,.steps{grid-template-columns:repeat(2,1fr)}
  .shots{grid-template-columns:repeat(3,1fr)}
  .ft-in{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .nav{position:fixed;top:70px;left:0;right:0;flex-direction:column;align-items:stretch;gap:4px;background:#fff;padding:14px 20px 22px;border-bottom:1px solid var(--line);box-shadow:var(--shadow-m);transform:translateY(-130%);transition:.28s;margin-left:0}
  .nav.open{transform:translateY(0)}
  .nav a{padding:13px 16px}
  .hd .btn{display:none}
  .burger{display:block}
  .hero-in{grid-template-columns:1fr;gap:34px}
  .hero{padding:44px 0 54px}
  .hero h1{font-size:33px}
  .phones{min-height:390px}
  .stats-in{grid-template-columns:repeat(2,1fr);gap:12px}
  .shots{grid-template-columns:repeat(2,1fr)}
  .band{grid-template-columns:1fr;padding:38px 26px}
  .band h2{font-size:25px}
  .phead h1{font-size:29px}
  .art{padding:30px 22px}
  .sec{padding:56px 0}
  .sec-h h2{font-size:26px}
}
@media (max-width:560px){
  .fgrid,.tgrid,.rgrid,.steps,.shots{grid-template-columns:1fr}
  .hero h1{font-size:29px}
  .hero .lead{font-size:15.5px}
  .phone{width:200px}
  .phone.small{width:150px}
  .float{padding:10px 13px}
  .ft-in{grid-template-columns:1fr;gap:26px}
  .art h2{font-size:22px}
  .sec-h h2{font-size:23px}
}