:root{
  --bg:#ffffff;
  --ink:#0d1b2a;
  --muted:#5b6b7c;
  --line:#e7edf3;
  --brand:#0b5cff;
  --brand-2:#00c2a8;
  --brand-deep:#062a8c;
  --soft:#f4f8ff;
  --soft-2:#eefbf7;
  --radius:16px;
  --shadow:0 10px 40px rgba(11,92,255,.10);
  --shadow-sm:0 4px 18px rgba(13,27,42,.06);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3,.brand-font{font-family:'Sora','Inter',sans-serif;letter-spacing:-.02em}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{width:min(1180px,92%);margin-inline:auto}
.btn{display:inline-flex;align-items:center;gap:.5rem;font-weight:600;font-size:.95rem;padding:.8rem 1.4rem;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:.2s;white-space:nowrap}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 24px rgba(11,92,255,.28)}
.btn-primary:hover{background:var(--brand-deep);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-lg{padding:1rem 1.7rem;font-size:1.02rem}
.eyebrow{display:inline-block;font-weight:700;font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--brand);background:var(--soft);padding:.4rem .8rem;border-radius:999px}

/* NAV */
header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:2rem;height:70px}
.logo{display:flex;align-items:center;gap:.55rem;font-family:'Sora';font-weight:800;font-size:1.3rem}
.logo .dot{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;color:#fff;font-size:1.1rem;box-shadow:0 6px 16px rgba(11,92,255,.35)}
.logo-mark{width:34px;height:34px;display:block;flex:0 0 auto;filter:drop-shadow(0 6px 14px rgba(11,92,255,.28))}
.wm{font-family:'Sora';font-weight:800;font-size:1.3rem;letter-spacing:-.02em;line-height:1}
.wm .wm2{background:linear-gradient(120deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;gap:1.6rem;margin-inline-start:1rem;font-size:.95rem;font-weight:500;color:var(--muted)}
.nav-links a:hover,.nav-links a.active{color:var(--brand)}
.nav-cta{margin-inline-start:auto;display:flex;gap:.7rem;align-items:center}
.menu-btn{display:none;background:none;border:0;font-size:1.5rem;cursor:pointer}

/* HERO (home) */
.hero{position:relative;overflow:hidden;padding:5rem 0 4rem;background:radial-gradient(1200px 500px at 80% -10%,var(--soft) 0,transparent 60%),radial-gradient(900px 400px at 0% 20%,var(--soft-2) 0,transparent 55%)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:3rem;align-items:center}
.hero h1{font-size:clamp(2.2rem,5vw,3.6rem);line-height:1.08;margin:1.1rem 0}
.hero h1 .g{background:linear-gradient(120deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:1.15rem;color:var(--muted);max-width:34ch}
.hero-actions{display:flex;gap:.9rem;margin:1.8rem 0 1.4rem;flex-wrap:wrap}
.trust-line{display:flex;align-items:center;gap:.6rem;color:var(--muted);font-size:.9rem}
.trust-line b{color:var(--ink)}
.badge-rbi{display:inline-flex;align-items:center;gap:.45rem;font-size:.82rem;font-weight:600;color:var(--brand-deep);background:#fff;border:1px solid var(--line);padding:.35rem .7rem;border-radius:999px;box-shadow:var(--shadow-sm)}

.mock{background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:1.3rem;position:relative}
.mock::before{content:"";position:absolute;inset:-1px;border-radius:22px;background:linear-gradient(135deg,rgba(11,92,255,.15),transparent 40%);pointer-events:none}
.mock-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}
.mock-top .t{font-family:'Sora';font-weight:700}
.mock-live{font-size:.72rem;color:var(--brand-2);font-weight:700;display:flex;align-items:center;gap:.35rem}
.mock-live::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--brand-2);box-shadow:0 0 0 4px rgba(0,194,168,.2)}
.mock-amt{font-family:'Sora';font-size:2rem;font-weight:800}
.mock-sub{color:var(--muted);font-size:.85rem;margin-bottom:1rem}
.bars{display:flex;align-items:flex-end;gap:.5rem;height:96px;padding-top:.5rem}
.bars span{flex:1;background:linear-gradient(var(--brand),var(--brand-2));border-radius:6px 6px 3px 3px;opacity:.85}
.mock-modes{display:flex;gap:.5rem;margin-top:1rem;flex-wrap:wrap}
.chip{font-size:.75rem;font-weight:600;color:var(--brand-deep);background:var(--soft);border:1px solid var(--line);padding:.3rem .6rem;border-radius:8px}
.float-card{position:absolute;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:.7rem .9rem;font-size:.8rem;font-weight:600;display:flex;align-items:center;gap:.5rem}
.float-card .ic{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;color:#fff;font-size:.95rem}
.fc1{top:-18px;left:-22px}
.fc2{bottom:-16px;right:-18px}

/* sub-page hero */
.subhero{position:relative;overflow:hidden;padding:3.5rem 0 3rem;background:radial-gradient(900px 400px at 85% -20%,var(--soft) 0,transparent 60%),radial-gradient(700px 320px at 5% 10%,var(--soft-2) 0,transparent 55%)}
.crumb{font-size:.85rem;color:var(--muted);margin-bottom:.8rem}
.crumb a:hover{color:var(--brand)}
.subhero h1{font-size:clamp(2rem,4.4vw,3rem);line-height:1.1;margin:.6rem 0}
.subhero p.lead{font-size:1.12rem;color:var(--muted);max-width:56ch}
.subhero .hero-actions{margin-top:1.6rem}

/* logos strip */
.strip{padding:2.2rem 0;border-block:1px solid var(--line);background:#fff}
.strip p{text-align:center;color:var(--muted);font-size:.85rem;text-transform:uppercase;letter-spacing:.12em;font-weight:600;margin-bottom:1.2rem}
.logos{display:flex;justify-content:center;gap:2.5rem;flex-wrap:wrap;align-items:center;opacity:.75}
.logos span{font-family:'Sora';font-weight:800;font-size:1.15rem;color:#8494a6}

/* SECTION shared */
section.block{padding:5rem 0}
.sec-head{text-align:center;max-width:640px;margin-inline:auto;margin-bottom:3rem}
.sec-head h2{font-size:clamp(1.8rem,3.6vw,2.6rem);margin:.8rem 0}
.sec-head p{color:var(--muted);font-size:1.08rem}

/* cards grid */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem;transition:.25s;position:relative;overflow:hidden;display:block;color:inherit}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.card .ic{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;font-size:1.4rem;color:#fff;margin-bottom:1rem}
.ic svg{width:26px;height:26px;display:block}
.mode .e svg{display:block;width:auto}
.mode .e img{display:block;width:auto;max-width:92%}
.card h3{font-size:1.15rem;margin-bottom:.5rem}
.card p{color:var(--muted);font-size:.94rem}
.card .more{margin-top:.9rem;font-weight:600;color:var(--brand);font-size:.9rem}
.g-blue{background:linear-gradient(135deg,#0b5cff,#3d82ff)}
.g-teal{background:linear-gradient(135deg,#00c2a8,#28d9be)}
.g-violet{background:linear-gradient(135deg,#6c4bff,#9b7cff)}
.g-amber{background:linear-gradient(135deg,#ff9500,#ffb648)}
.g-pink{background:linear-gradient(135deg,#ff4d8d,#ff7aa8)}
.g-slate{background:linear-gradient(135deg,#334155,#64748b)}

/* payment modes */
.modes{background:linear-gradient(180deg,var(--soft),#fff);border-radius:28px;padding:3rem;display:grid;grid-template-columns:1fr 1fr;gap:2.5rem;align-items:center}
.modes h2{font-size:clamp(1.7rem,3vw,2.3rem);margin-bottom:1rem}
.modes p{color:var(--muted);margin-bottom:1.5rem}
.mode-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.7rem}
.mode{background:#fff;border:1px solid var(--line);border-radius:12px;padding:.9rem .4rem;text-align:center;font-weight:600;font-size:.85rem;box-shadow:var(--shadow-sm)}
.mode .e{display:flex;align-items:center;justify-content:center;height:30px;margin-bottom:.4rem}

/* stats */
.stats{background:linear-gradient(120deg,#062a8c,#0b5cff);color:#fff;border-radius:28px;padding:3rem;display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem;text-align:center}
.stat .n{font-family:'Sora';font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800}
.stat .l{opacity:.82;font-size:.92rem;margin-top:.2rem}

/* features split */
.feat{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.feat-list{display:flex;flex-direction:column;gap:1.1rem}
.feat-item{display:flex;gap:1rem;align-items:flex-start}
.feat-item .tick{flex:0 0 auto;width:30px;height:30px;border-radius:9px;background:var(--soft-2);color:var(--brand-2);display:grid;place-items:center;font-weight:800}
.feat-item h4{font-size:1.05rem}
.feat-item p{color:var(--muted);font-size:.92rem}
.feat-visual{background:#0d1b2a;border-radius:22px;padding:1.6rem;color:#dfe8f4;font-family:'SF Mono',ui-monospace,monospace;font-size:.82rem;box-shadow:var(--shadow);overflow:auto}
.feat-visual .cm{color:#6b8299}
.feat-visual .k{color:#66d9ef}
.feat-visual .s{color:#a6e22e}
.code-top{display:flex;gap:.4rem;margin-bottom:1rem}
.code-top i{width:11px;height:11px;border-radius:50%;display:inline-block}
.code-top i:nth-child(1){background:#ff5f56}.code-top i:nth-child(2){background:#ffbd2e}.code-top i:nth-child(3){background:#27c93f}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem;counter-reset:s}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem;position:relative}
.step::before{counter-increment:s;content:"0" counter(s);font-family:'Sora';font-weight:800;font-size:1.6rem;color:var(--brand);opacity:.35}
.step h4{margin:.5rem 0 .4rem;font-size:1.1rem}
.step p{color:var(--muted);font-size:.92rem}

/* testimonials */
.quotes{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem}
.quote{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem}
.quote .stars{color:#ffb648;margin-bottom:.6rem}
.quote p{font-size:.96rem;margin-bottom:1rem}
.quote .who{display:flex;align-items:center;gap:.7rem}
.quote .av{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:grid;place-items:center;font-weight:700}
.quote .who b{display:block;font-size:.9rem}
.quote .who span{color:var(--muted);font-size:.8rem}

/* CTA */
.cta{background:linear-gradient(120deg,#00c2a8,#0b5cff);border-radius:28px;padding:3.5rem;text-align:center;color:#fff}
.cta h2{font-size:clamp(1.8rem,3.4vw,2.6rem);margin-bottom:.8rem}
.cta p{opacity:.92;max-width:48ch;margin:0 auto 1.8rem;font-size:1.08rem}
.cta .btn-primary{background:#fff;color:var(--brand-deep)}
.cta .btn-primary:hover{background:#eef4ff}
.cta .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}

/* prose / generic content */
.prose{max-width:760px;margin-inline:auto}
.prose h2{font-size:1.6rem;margin:2.2rem 0 .8rem}
.prose h3{font-size:1.2rem;margin:1.6rem 0 .5rem}
.prose p{color:var(--muted);margin-bottom:1rem}
.prose ul{color:var(--muted);padding-inline-start:1.2rem;margin-bottom:1rem;display:flex;flex-direction:column;gap:.4rem}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.media{background:linear-gradient(135deg,var(--soft),var(--soft-2));border:1px solid var(--line);border-radius:22px;min-height:320px;display:grid;place-items:center;font-size:5rem}

/* value/benefit tiles */
.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem}
.tile{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem}
.tile .e{font-size:1.6rem;margin-bottom:.6rem}
.tile .e svg{width:30px;height:30px;display:block;color:var(--brand)}
.tile h4{font-size:1.05rem;margin-bottom:.4rem}
.tile p{color:var(--muted);font-size:.92rem}

/* timeline (about) */
.timeline{max-width:760px;margin-inline:auto;border-inline-start:2px solid var(--line);padding-inline-start:1.6rem;display:flex;flex-direction:column;gap:1.6rem}
.tl{position:relative}
.tl::before{content:"";position:absolute;inset-inline-start:-2.15rem;top:.35rem;width:12px;height:12px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px var(--soft)}
.tl .yr{font-family:'Sora';font-weight:800;color:var(--brand)}
.tl h4{margin:.2rem 0}
.tl p{color:var(--muted);font-size:.94rem}

/* team */
.team{display:grid;grid-template-columns:repeat(4,1fr);gap:1.3rem}
.member{text-align:center}
.member .av{width:96px;height:96px;border-radius:50%;margin:0 auto .8rem;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:grid;place-items:center;font-family:'Sora';font-weight:800;font-size:1.8rem}
.member b{display:block}
.member span{color:var(--muted);font-size:.88rem}

/* pricing */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem;align-items:stretch}
.plan{background:#fff;border:1px solid var(--line);border-radius:20px;padding:2rem;display:flex;flex-direction:column}
.plan.pop{border-color:var(--brand);box-shadow:var(--shadow);position:relative}
.plan.pop::after{content:attr(data-pop);position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--brand);color:#fff;font-size:.72rem;font-weight:700;padding:.3rem .8rem;border-radius:999px}
.plan h3{font-size:1.25rem}
.plan .price{font-family:'Sora';font-size:2.4rem;font-weight:800;margin:.6rem 0 .2rem}
.plan .price small{font-size:.9rem;font-weight:500;color:var(--muted)}
.plan .desc{color:var(--muted);font-size:.9rem;margin-bottom:1.2rem}
.plan ul{list-style:none;display:flex;flex-direction:column;gap:.6rem;margin-bottom:1.5rem;font-size:.92rem}
.plan ul li{display:flex;gap:.5rem;align-items:flex-start}
.plan ul li::before{content:"✓";color:var(--brand-2);font-weight:800}
.plan .btn{margin-top:auto;justify-content:center}
.rate-table{width:100%;border-collapse:collapse;font-size:.95rem;margin-top:1rem}
.rate-table th,.rate-table td{padding:.9rem 1rem;text-align:start;border-bottom:1px solid var(--line)}
.rate-table th{font-family:'Sora';font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.rate-table td b{color:var(--brand-deep)}

/* FAQ */
.faq{max-width:760px;margin-inline:auto;display:flex;flex-direction:column;gap:.7rem}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:.2rem 1.2rem}
.faq summary{cursor:pointer;font-weight:600;padding:1rem 0;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:1.4rem;color:var(--brand);font-weight:400}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--muted);padding-bottom:1rem;font-size:.95rem}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem}
.form{background:#fff;border:1px solid var(--line);border-radius:20px;padding:2rem;box-shadow:var(--shadow-sm)}
.form label{display:block;font-size:.85rem;font-weight:600;margin:1rem 0 .35rem}
.form input,.form textarea,.form select{width:100%;padding:.8rem 1rem;border:1px solid var(--line);border-radius:10px;font:inherit;font-size:.95rem;background:#fbfcfe}
.form input:focus,.form textarea:focus,.form select:focus{outline:2px solid var(--brand);border-color:transparent}
.form .btn{margin-top:1.4rem;width:100%;justify-content:center}
.info-item{display:flex;gap:1rem;align-items:flex-start;margin-bottom:1.4rem}
.info-item .ic{width:44px;height:44px;flex:0 0 auto;border-radius:12px;background:var(--soft);display:grid;place-items:center;font-size:1.3rem;color:var(--brand)}
.info-item .ic svg{width:22px;height:22px;display:block}
.info-item b{display:block}
.info-item span{color:var(--muted);font-size:.92rem}

/* developer docs */
.doc-layout{display:grid;grid-template-columns:220px 1fr;gap:2.5rem;align-items:start}
.doc-nav{position:sticky;top:90px;font-size:.92rem;display:flex;flex-direction:column;gap:.3rem}
.doc-nav a{padding:.45rem .7rem;border-radius:8px;color:var(--muted)}
.doc-nav a:hover{background:var(--soft);color:var(--brand)}
.doc-nav .grp{font-family:'Sora';font-weight:700;font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink);margin:1rem 0 .3rem}
.codeblock{background:#0d1b2a;border-radius:14px;padding:1.2rem 1.4rem;color:#dfe8f4;font-family:'SF Mono',ui-monospace,monospace;font-size:.85rem;overflow:auto;margin:1rem 0}
.codeblock .cm{color:#6b8299}.codeblock .k{color:#66d9ef}.codeblock .s{color:#a6e22e}
.method{display:inline-block;font-family:'SF Mono',monospace;font-size:.75rem;font-weight:700;padding:.15rem .5rem;border-radius:6px;color:#fff}
.m-post{background:#00c2a8}.m-get{background:#0b5cff}

/* footer */
footer{background:#081222;color:#aebdd0;padding:4rem 0 2rem;margin-top:4rem}
.foot-grid{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:2rem}
footer h5{color:#fff;font-family:'Sora';margin-bottom:1rem;font-size:.95rem}
footer ul{list-style:none;display:flex;flex-direction:column;gap:.55rem;font-size:.9rem}
footer a:hover{color:#fff}
footer .logo{color:#fff;margin-bottom:1rem}
footer .desc{font-size:.9rem;max-width:34ch;margin-bottom:1rem}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:2.5rem;padding-top:1.5rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;font-size:.85rem}
.soc{display:flex;gap:.7rem}
.soc a{width:34px;height:34px;border-radius:9px;background:rgba(255,255,255,.08);display:grid;place-items:center;color:#fff}
.soc a:hover{background:var(--brand)}

/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

@media(max-width:900px){
  .hero-grid,.feat,.modes,.two-col,.contact-grid{grid-template-columns:1fr}
  .cards,.quotes,.steps,.tiles,.plans{grid-template-columns:1fr 1fr}
  .stats,.team{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
  .menu-btn{display:block}
  .hero-visual{order:-1}
  .doc-layout{grid-template-columns:1fr}
  .doc-nav{position:static;flex-direction:row;flex-wrap:wrap;overflow:auto}
  .doc-nav .grp{width:100%}
}
@media(max-width:560px){
  .cards,.quotes,.steps,.stats,.mode-grid,.foot-grid,.tiles,.plans,.team{grid-template-columns:1fr 1fr}
  .modes,.cta,.stats{padding:2rem 1.3rem}
  .quotes,.plans{grid-template-columns:1fr}
}