:root{--b:#1f5cff;--b2:#3d8bff;--ink:#0f1730;--mu:#6a7391;--line:#e7ebf5}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:15px/1.65 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;color:var(--ink);background:#fff;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 28px}
.wm{font-weight:900;letter-spacing:-.02em;color:var(--b);font-family:"Arial Rounded MT Bold","Avenir Next",Arial,sans-serif}
.wm span{color:var(--b)}
.btn{display:inline-flex;align-items:center;gap:10px;border-radius:999px;padding:13px 30px;font-weight:700;font-size:16px;color:#fff;background:linear-gradient(135deg,#2a6bff,#1446e0);box-shadow:0 12px 28px rgba(31,92,255,.32);border:0;cursor:pointer;white-space:nowrap}
.btn.sm{padding:9px 22px;font-size:14.5px}.btn.ghost{background:#fff;color:var(--b);box-shadow:inset 0 0 0 1.5px #c9d6ff}
.btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
/* header */
.hd{position:fixed;top:0;left:0;right:0;z-index:20;transition:.25s}
.hd.solid{background:rgba(255,255,255,.88);backdrop-filter:blur(12px);box-shadow:0 1px 0 var(--line)}
.hd .wrap{display:flex;align-items:center;height:72px;gap:48px}
.hd .wm{font-size:30px}.hd nav{display:flex;gap:40px;flex:1}.hd nav a{color:#2b3352;font-size:15px}.hd nav a:hover{color:var(--b)}
.hd .acts{display:flex;gap:12px;align-items:center}.hd .acts .lg{color:#2b3352;font-size:14.5px}
/* hero */
.hero{position:relative;min-height:720px;padding-top:72px;overflow:hidden}
.hero:before{content:"";position:absolute;right:-12%;top:-30%;width:78%;height:135%;border-radius:0 0 0 52%;background:radial-gradient(circle at 70% 30%,#5aa2ff 0,#1f5cff 45%,#0d3fd8 80%);transform:rotate(-6deg)}
.hero:after{content:"";position:absolute;right:-5%;bottom:-120px;width:70%;height:300px;border-radius:50%;background:#fff;transform:rotate(-8deg)}
.hero .wrap{position:relative;z-index:2;display:grid;grid-template-columns:1fr 1.05fr;gap:20px;align-items:center;min-height:620px}
.tag{display:inline-block;padding:7px 16px;border-radius:999px;background:#eaf1ff;color:var(--b);font-size:13.5px;font-weight:700}
.hero h1{font-size:96px;line-height:1.08;margin:22px 0 22px;font-weight:900;letter-spacing:-.02em}
.hero h1 i{display:inline-block;width:.2em;height:.2em;border-radius:50%;border:.06em solid var(--b);margin-left:.06em}
.hero p{color:#4a5373;font-size:17px;max-width:470px;margin:0 0 34px}
.cta{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.plat{display:flex;gap:12px}.plat a{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:#f1f4fb;color:#3a4260;transition:.2s}.plat a:hover{background:#e3ebff;color:var(--b)}
.plat svg{width:22px;height:22px;fill:currentColor}
.try{color:var(--b);font-weight:600;font-size:14.5px}
/* stage */
.stage{position:relative;height:600px}
.bub{position:absolute;border-radius:40%;background:radial-gradient(circle at 30% 25%,rgba(255,255,255,.95),rgba(170,205,255,.55) 30%,rgba(60,120,255,.35) 70%,rgba(255,255,255,.4));box-shadow:inset 0 -10px 30px rgba(20,70,220,.35),inset 0 10px 25px rgba(255,255,255,.8),0 25px 50px rgba(10,40,160,.25);backdrop-filter:blur(6px)}
.bub.dots{width:170px;height:130px;left:-40px;top:20px;border-radius:44px;display:flex;gap:16px;align-items:center;justify-content:center;transform:rotate(-8deg)}
.bub.dots:after{content:"";position:absolute;left:34px;bottom:-22px;border:16px solid transparent;border-top:22px solid rgba(120,170,255,.6)}
.bub.dots b{width:24px;height:24px;border-radius:50%;background:#fff;box-shadow:0 2px 6px rgba(20,70,220,.3)}
.bub.heart{width:120px;height:100px;right:-10px;top:330px;border-radius:34px;display:grid;place-items:center;transform:rotate(10deg)}
.bub.heart svg{width:44px;height:44px;fill:#fff;filter:drop-shadow(0 3px 6px rgba(20,70,220,.4))}
.bub.ring{width:90px;height:90px;border-radius:50%;left:30px;bottom:30px;background:radial-gradient(circle at 35% 30%,#fff,#9cc2ff 40%,#2a6bff 90%)}
.bub.plane{width:110px;height:80px;left:-10px;top:250px;border-radius:24px;display:grid;place-items:center;transform:rotate(-14deg)}
.bub.plane svg{width:42px;fill:#fff}
.ava{position:absolute;width:52px;height:52px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:800;border:3px solid rgba(255,255,255,.85);box-shadow:0 10px 24px rgba(10,40,160,.3)}
.ph{position:absolute;width:250px;height:510px;border-radius:40px;background:linear-gradient(145deg,#f4f7ff,#cfdaf3);padding:9px;box-shadow:0 40px 80px rgba(8,30,120,.38),inset 0 0 0 1.5px rgba(255,255,255,.9)}
.ph .sc{height:100%;border-radius:32px;background:#fff;overflow:hidden;display:flex;flex-direction:column;font-size:12px}
.ph1{left:90px;top:40px;transform:rotate(-4deg);z-index:2}.ph2{left:320px;top:80px;transform:rotate(5deg)}
.sb{display:flex;justify-content:space-between;padding:12px 20px 4px;font-weight:700;font-size:11.5px}
.ph .top{display:flex;justify-content:space-between;align-items:center;padding:6px 16px 8px}.ph .top .wm{font-size:20px}
.srch{margin:0 14px 8px;background:#f1f4fb;border-radius:12px;padding:7px 12px;color:#9aa3bf;font-size:11px}
.row{display:flex;gap:10px;align-items:center;padding:8px 14px}
.av{flex:0 0 36px;height:36px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:800;font-size:13px}
.row div{flex:1;min-width:0}.row b{display:block;font-size:12.5px}.row span{color:#8a93ad;font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
.row em{font-style:normal;color:#a3abc2;font-size:10px;text-align:right}.row em u{display:block;text-decoration:none;margin:3px 0 0 auto;width:16px;height:16px;border-radius:50%;background:var(--b);color:#fff;font-size:9.5px;text-align:center;line-height:16px}
.tabs{margin-top:auto;display:flex;justify-content:space-around;border-top:1px solid var(--line);padding:8px 0 14px;color:#9aa3bf;font-size:10px}.tabs .on{color:var(--b);font-weight:700}
.ch{flex:1;background:#f5f7fc;padding:10px 12px;display:flex;flex-direction:column;gap:9px}
.m{max-width:78%;padding:8px 11px;border-radius:14px;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.05)}.m.me{align-self:flex-end;background:linear-gradient(135deg,#2a6bff,#1f5cff);color:#fff}
.m.img{padding:5px}.m.img i{display:block;width:120px;height:80px;border-radius:10px;background:linear-gradient(160deg,#bcd3ff,#6f9dff 60%,#e8efff)}
.tip{align-self:center;font-size:10px;color:#9aa3bf;background:#eef1f8;border-radius:8px;padding:2px 8px}
.inp{display:flex;gap:8px;padding:9px 12px 14px;border-top:1px solid var(--line);color:#a3abc2}
.inp span{flex:1;background:#f1f4fb;border-radius:12px;padding:6px 10px}
.demo{position:absolute;right:10px;bottom:6px;z-index:3;color:rgba(255,255,255,.85);font-size:12px}
/* brand band */
.brand{padding:30px 0 70px}
.brand .wrap{display:grid;grid-template-columns:1.25fr 1fr 1.6fr;gap:30px;align-items:center}
.big{position:relative}.big .wm{font-size:150px;line-height:1}
.big em{position:absolute;right:-10px;bottom:-6px;font-style:normal;color:var(--b);font-size:22px;transform:rotate(-12deg);font-family:"Kaiti SC","STKaiti","KaiTi",cursive}
.lead h3{font-size:22px;margin:0 0 10px;line-height:1.4}.lead p{color:var(--mu);font-size:13.5px;margin:0}
.mini{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.mini div{text-align:center}.mini svg,.card .ic svg{width:34px;height:34px;fill:none;stroke:var(--b);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.mini b{display:block;margin:6px 0 2px}.mini span{color:var(--mu);font-size:12.5px}
/* sections */
.sec{padding:84px 0}.sec.alt{background:linear-gradient(180deg,#f5f8ff,#fff)}
.sh{text-align:center;margin-bottom:46px}.sh small{color:var(--b);font-weight:700;letter-spacing:.12em}.sh h2{font-size:38px;margin:8px 0 8px}.sh p{color:var(--mu);margin:0}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{border-radius:22px;padding:26px 22px;background:#fff;border:1px solid var(--line);transition:.25s;position:relative}
.card:hover{transform:translateY(-4px);box-shadow:0 24px 50px rgba(31,92,255,.12)}
.card .ic{width:58px;height:58px;border-radius:18px;display:grid;place-items:center;background:radial-gradient(circle at 30% 25%,#fff,#dbe7ff 60%,#c4d6ff);box-shadow:inset 0 -4px 10px rgba(31,92,255,.15);margin-bottom:16px}
.card .ic svg{width:28px;height:28px}
.card h4{margin:0 0 6px;font-size:17px}.card p{margin:0;color:var(--mu);font-size:13.5px}
.card .new{position:absolute;top:18px;right:18px;font-size:11px;font-weight:700;color:var(--b);background:#eaf1ff;border-radius:999px;padding:2px 9px}
.foot-note{margin-top:22px;text-align:center;color:var(--mu);font-size:13px}
/* how */
.how{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:center}
.how h2{font-size:36px;margin:8px 0 12px}.how p{color:#4a5373}.how ol{padding-left:20px;color:#4a5373}
code{background:#eaf1ff;color:#1f4fd8;border-radius:6px;padding:1px 6px;font-size:13px}
.code{border-radius:20px;background:#0c1638;box-shadow:0 30px 70px rgba(8,30,120,.3);overflow:hidden}
.cbar{display:flex;align-items:center;gap:7px;padding:12px 16px;background:#121f4d;color:#8fa2d8;font-size:12px}
.cbar i{width:11px;height:11px;border-radius:50%;background:#ff6b6b}.cbar i:nth-child(2){background:#ffc04d}.cbar i:nth-child(3){background:#3ddc97}
.cbar span{flex:1;margin-left:8px}.cbar button{border:0;border-radius:8px;background:#1f5cff;color:#fff;padding:5px 14px;font-size:12px;cursor:pointer}
.code pre{margin:0;padding:22px;color:#cfe1ff;font:13.5px/1.75 ui-monospace,Menlo,Consolas,monospace;white-space:pre-wrap;word-break:break-all}
/* download band */
.dl{margin:0 auto;border-radius:32px;padding:46px 50px;color:#fff;background:radial-gradient(circle at 85% 20%,#6aa8ff,transparent 40%),linear-gradient(120deg,#1446e0,#2a6bff);display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;position:relative;overflow:hidden}
.dl h2{margin:0 0 6px;font-size:32px}.dl p{margin:0;opacity:.85}.dl .btn{background:#fff;color:var(--b);box-shadow:none}
/* faq + footer */
.faq{max-width:840px;margin:0 auto;display:grid;gap:12px}
.faq details{border:1px solid var(--line);border-radius:16px;padding:16px 20px}.faq summary{font-weight:700;cursor:pointer}.faq p{margin:10px 0 0;color:#4a5373}
.ft{background:#0b1430;color:#9aa6c8;padding:54px 0 26px;font-size:14px}
.ft .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}.ft .wm{font-size:30px;color:#fff}
.ft h5{color:#fff;margin:0 0 12px;font-size:14px}.ft a{display:block;line-height:2.1}.ft a:hover{color:#fff}.ft small{display:block;border-top:1px solid #1d2a55;padding-top:20px}
/* responsive */
@media(max-width:1100px){.hero h1{font-size:72px}.ph2{left:270px}.brand .wrap{grid-template-columns:1fr 1fr}.mini{grid-column:1/-1}.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){
.hd .wrap{gap:16px}.hd nav,.hd .acts .lg{display:none}.hd .acts{margin-left:auto}.hd .wm{font-size:26px}
.hero{min-height:0}.hero:before{right:-40%;top:auto;bottom:-10%;width:150%;height:62%;border-radius:50% 50% 0 0;transform:none}.hero:after{display:none}
.hero .wrap{grid-template-columns:1fr;min-height:0;padding-top:30px}.hero h1{font-size:56px}
.stage{height:470px;margin:0 auto;width:360px}.ph{width:190px;height:390px;border-radius:32px}.ph .sc{border-radius:25px}.ph1{left:10px;top:20px}.ph2{left:160px;top:50px}
.bub.dots{width:110px;height:84px;left:-6px;top:-10px;z-index:3}.bub.dots b{width:15px;height:15px}.bub.heart{width:80px;height:66px;right:-6px;top:300px;z-index:3}.bub.plane,.bub.ring,.ava{display:none}
.ph .row:nth-child(n+8){display:none}
.brand .wrap{grid-template-columns:1fr}.big .wm{font-size:96px}.big em{right:auto;left:250px}
.grid{grid-template-columns:1fr 1fr;gap:12px}.card{padding:18px 16px}.how{grid-template-columns:1fr}.sh h2,.how h2{font-size:28px}
.dl{padding:32px 26px}.ft .cols{grid-template-columns:1fr 1fr}.ft .cols>div:first-child{grid-column:1/-1}}
@media(max-width:420px){.wrap{padding:0 18px}.hero h1{font-size:48px}.stage{transform:scale(.92);transform-origin:top center}.grid{grid-template-columns:1fr}.mini{grid-template-columns:repeat(3,1fr)}}
.row .av{color:#fff;display:grid;font-size:13px}
@media(min-width:821px){.hero:before{right:-22%;width:72%}.hero .wrap{grid-template-columns:1fr 1.1fr}.hero p{max-width:430px}}
.big em{bottom:-34px;right:0}
@media(max-width:820px){.big em{bottom:-28px;left:120px}}
.big em{position:static;display:block;transform:rotate(-6deg);margin:6px 0 0 150px}
@media(max-width:820px){.big em{margin-left:90px}}

.wm .sy-ic{width:1.25em;height:1.25em;border-radius:.32em;vertical-align:-.28em;margin-right:.3em;box-shadow:0 4px 12px rgba(93,135,255,.28)}
.hd .wm{display:inline-flex;align-items:center}.hd .wm .sy-ic{width:40px;height:40px;border-radius:11px;vertical-align:0;margin-right:10px}
.ft .wm{display:inline-flex;align-items:center}.ft .wm .sy-ic{width:40px;height:40px;border-radius:11px;margin-right:10px}

/* S logo (2026-10-19 merchant redesign) */
.sy-ic,.sycs-ic{border-radius:0!important;box-shadow:none!important;background:none!important;object-fit:contain;filter:drop-shadow(0 4px 8px rgba(99,102,241,.22))}