:root{
  --brand:#5b6ef5; --brand2:#7c3aed; --accent:#06b6d4;
  --ink:#0f172a; --muted:#64748b; --line:#e6e9f2;
  --bg:#f6f8fc; --card:#ffffff; --ok:#10b981; --warn:#f59e0b;
  --radius:18px; --shadow:0 10px 30px rgba(30,41,99,.08);
  --shadow-lg:0 24px 60px rgba(91,110,245,.18);
}
*{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);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
.wrap{max-width:1180px;margin:0 auto;padding:0 22px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:12px;font-weight:600;
  font-size:15px;cursor:pointer;border:0;transition:.25s;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow-lg)}
.btn-primary:hover{transform:translateY(-2px);filter:brightness(1.05)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}

/* NAV */
header.nav{position:sticky;top:0;z-index:50;backdrop-filter:saturate(180%) blur(14px);
  background:rgba(246,248,252,.72);border-bottom:1px solid rgba(230,233,242,.7)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:.3px}
.logo .mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand2));
  display:grid;place-items:center;color:#fff;font-weight:800;box-shadow:var(--shadow)}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{padding:9px 14px;border-radius:10px;color:var(--muted);font-weight:500;font-size:15px;transition:.2s}
.nav-links a:hover{color:var(--ink);background:#eef1fb}
.nav-cta{display:flex;gap:10px;align-items:center}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.burger span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* HERO */
.hero{position:relative;overflow:hidden;padding:78px 0 64px}
.blob{position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;z-index:0}
.blob.b1{width:420px;height:420px;background:#c7d2fe;top:-120px;right:-80px}
.blob.b2{width:360px;height:360px;background:#ddd6fe;bottom:-140px;left:-100px}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.tag{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;
  background:#eef1fb;color:var(--brand);font-size:13px;font-weight:600;margin-bottom:18px}
.tag .dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px rgba(16,185,129,.18)}
h1{font-size:46px;line-height:1.15;font-weight:800;letter-spacing:-.5px}
h1 .grad{background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{margin:20px 0 28px;color:var(--muted);font-size:17px;max-width:520px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-meta{margin-top:26px;display:flex;gap:24px;color:var(--muted);font-size:14px;flex-wrap:wrap}
.hero-meta b{color:var(--ink)}

/* HERO CARD MOCK */
.paycard{background:linear-gradient(160deg,#1e293b,#0f172a);border-radius:22px;padding:26px;color:#fff;
  box-shadow:var(--shadow-lg);position:relative;transform:rotate(1.5deg)}
.paycard .row{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}
.paycard .chip{width:42px;height:30px;border-radius:7px;background:linear-gradient(135deg,#fbbf24,#f59e0b)}
.paycard .brandmark{font-weight:800;letter-spacing:1px}
.paycard .amount{font-size:40px;font-weight:800;letter-spacing:-1px}
.paycard .amount small{font-size:16px;color:#94a3b8;font-weight:600}
.paycard .channels{display:flex;gap:10px;margin-top:18px}
.paycard .ch{width:38px;height:38px;border-radius:10px;background:rgba(255,255,255,.1);display:grid;place-items:center;font-size:13px;font-weight:700}
.paycard .scan{position:absolute;right:22px;bottom:22px;width:64px;height:64px;border-radius:12px;
  background:#fff;display:grid;place-items:center;color:var(--ink);font-weight:800;font-size:11px;line-height:1.2;text-align:center}

/* TRUST BAR */
.trust{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:30px 0}
.trust .item{text-align:center}
.trust .num{font-size:30px;font-weight:800;background:linear-gradient(135deg,var(--brand),var(--brand2));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.trust .lbl{color:var(--muted);font-size:14px;margin-top:4px}

/* SECTION */
section.block{padding:74px 0}
.sec-head{text-align:center;max-width:680px;margin:0 auto 46px}
.sec-head .kicker{color:var(--brand);font-weight:700;font-size:14px;letter-spacing:1px;text-transform:uppercase}
.sec-head h2{font-size:34px;font-weight:800;margin:10px 0 12px;letter-spacing:-.5px}
.sec-head p{color:var(--muted);font-size:16px}

.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.25s}
.feat:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d8def7}
.feat .ic{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;margin-bottom:14px;
  background:linear-gradient(135deg,#eef1fb,#f5f3ff);color:var(--brand)}
.feat h3{font-size:17px;margin-bottom:6px}
.feat p{color:var(--muted);font-size:14px}

/* CHANNELS */
.ch-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.ch-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 12px;text-align:center;transition:.2s}
.ch-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d8def7}
.ch-card .logo{width:44px;height:44px;margin:0 auto 10px;border-radius:12px;display:grid;place-items:center;color:#fff;font-weight:800;font-size:15px}
.ch-card span{font-size:13.5px;color:var(--muted);font-weight:500}

/* STEPS */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:s}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;position:relative}
.step .n{counter-increment:s;width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand2));
  color:#fff;font-weight:800;display:grid;place-items:center;margin-bottom:14px;font-size:18px}
.step .n::before{content:counter(s)}
.step h3{font-size:18px;margin-bottom:6px}
.step p{color:var(--muted);font-size:14.5px}

/* CODE */
.api{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.api .code{background:#0f172a;color:#e2e8f0;border-radius:var(--radius);padding:22px;font-family:"SFMono-Regular",Consolas,Menlo,monospace;
  font-size:13.5px;line-height:1.7;overflow:auto;box-shadow:var(--shadow-lg)}
.api .code .k{color:#c4b5fd}.api .code .s{color:#86efac}.api .code .c{color:#64748b}
.api ul{list-style:none;display:grid;gap:14px}
.api li{display:flex;gap:12px;align-items:flex-start}
.api li .ck{color:var(--ok);font-weight:800;flex:none}

/* PRICING / CTA */
.cta{background:linear-gradient(135deg,var(--brand),var(--brand2));border-radius:26px;padding:54px;text-align:center;color:#fff;
  position:relative;overflow:hidden}
.cta h2{font-size:32px;margin-bottom:10px}
.cta p{opacity:.9;margin-bottom:24px}
.cta .btn-ghost{background:#fff;color:var(--brand2);border:0}
.cta .btn-outline{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.5)}

/* FAQ */
.faq{max-width:760px;margin:0 auto;display:grid;gap:12px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:4px 18px}
.faq summary{padding:16px 0;cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--muted);transition:.2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq p{padding:0 0 16px;color:var(--muted);font-size:14.5px}

/* FOOTER */
footer{background:#0f172a;color:#cbd5e1;padding:54px 0 28px;margin-top:30px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
footer h4{color:#fff;font-size:15px;margin-bottom:14px}
footer a{color:#94a3b8;font-size:14px;display:block;padding:5px 0}
footer a:hover{color:#fff}
footer .copy{border-top:1px solid #1e293b;margin-top:34px;padding-top:20px;color:#64748b;font-size:13px;text-align:center}

@media(max-width:960px){
  .hero-grid,.api{grid-template-columns:1fr}
  .paycard{transform:none;max-width:420px}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .ch-grid{grid-template-columns:repeat(3,1fr)}
  .steps{grid-template-columns:1fr}
  h1{font-size:36px}
}
@media(max-width:680px){
  .nav-links,.nav-cta .btn-ghost{display:none}
  .burger{display:flex}
  .nav-links.open{display:flex;position:absolute;top:66px;left:0;right:0;flex-direction:column;
    background:#fff;padding:14px 22px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .trust-grid{grid-template-columns:repeat(2,1fr)}
  .feat-grid{grid-template-columns:1fr}
  .ch-grid{grid-template-columns:repeat(2,1fr)}
}