:root{
  --bg:#ffffff; --bg2:#f6f7fb; --ink:#0b0b0f; --ink2:#4a4d57; --ink3:#8a8e99;
  --line:#e8e9ef; --card:#ffffff; --pill:#0b0b0f; --pillink:#ffffff;
  --a1:#5b8cff; --a2:#9b6bff; --a3:#ff7ac6; --a4:#3ee6c9;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Inter,Roboto,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* nav */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:saturate(180%) blur(16px);background:rgba(255,255,255,.78);border-bottom:1px solid transparent;transition:border-color .2s}
.nav.scrolled{border-color:var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em;white-space:nowrap}
.logo{width:32px;height:32px;border-radius:10px;background:conic-gradient(from 210deg,var(--a1),var(--a2),var(--a3),var(--a4),var(--a1));position:relative;flex:none}
.logo::after{content:"S";position:absolute;inset:0;display:grid;place-items:center;color:#fff;font-weight:800;font-size:16px}
.links{display:flex;gap:28px;font-size:14px;color:var(--ink2)}
.links a:hover,.links a.on{color:var(--ink)}
.right{display:flex;align-items:center;gap:10px}
.lang{display:inline-flex;border:1px solid var(--line);background:#fff;border-radius:999px;padding:3px}
.lang button{border:0;background:none;border-radius:999px;padding:5px 12px;font-size:13px;cursor:pointer;color:var(--ink2);font-family:inherit;font-weight:600}
.lang button:hover{color:var(--ink)}
.lang button.on{background:var(--ink);color:#fff}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:12px 26px;font-size:15px;font-weight:600;transition:transform .15s,box-shadow .15s;cursor:pointer;border:0}
.btn.dark{background:var(--pill);color:var(--pillink)}
.btn.dark:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(11,11,15,.18)}
.btn.light{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.light:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(11,11,15,.08)}
.btn.sm{padding:8px 18px;font-size:13px}
.menu{display:none;background:none;border:0;font-size:22px;cursor:pointer}

/* hero */
.hero{position:relative;padding:120px 0 110px;text-align:center;overflow:hidden}
.orb{position:absolute;border-radius:50%;filter:blur(60px);opacity:.55;pointer-events:none;animation:float 14s ease-in-out infinite}
.orb.o1{width:460px;height:460px;right:-120px;top:20px;background:radial-gradient(circle at 30% 30%,var(--a4),var(--a1) 45%,var(--a2) 75%)}
.orb.o2{width:360px;height:360px;left:-140px;top:180px;background:radial-gradient(circle at 60% 40%,var(--a3),var(--a2) 60%);animation-delay:-5s}
.orb.o3{width:240px;height:240px;left:45%;top:-120px;background:radial-gradient(circle,#ffd36b,var(--a3));opacity:.35;animation-delay:-9s}
@keyframes float{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(-20px,24px) scale(1.06)}}
.chip{display:inline-flex;gap:8px;align-items:center;font-size:13px;color:var(--ink2);border:1px solid var(--line);border-radius:999px;padding:6px 14px;background:rgba(255,255,255,.7)}
.chip i{width:8px;height:8px;border-radius:50%;background:var(--a4);box-shadow:0 0 0 4px rgba(62,230,201,.2)}
.hero h1{position:relative;font-size:clamp(36px,6vw,72px);line-height:1.1;letter-spacing:-.03em;margin:26px auto 20px;max-width:900px;font-weight:800}
.grad{background:linear-gradient(90deg,var(--a1),var(--a2),var(--a3));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{position:relative;font-size:clamp(16px,2vw,19px);color:var(--ink2);max-width:640px;margin:0 auto 38px}
.cta{position:relative;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* sections */
section{padding:96px 0}
.alt{background:var(--bg2)}
.eyebrow{font-size:13px;font-weight:600;color:var(--a2);letter-spacing:.08em;text-transform:uppercase}
.h2{font-size:clamp(28px,4vw,44px);letter-spacing:-.02em;line-height:1.2;margin:10px 0 14px;font-weight:800}
.lead{color:var(--ink2);max-width:680px;font-size:17px}
.head{margin-bottom:48px}
.head.c{text-align:center}.head.c .lead{margin:0 auto}

.grid{display:grid;gap:20px}
.g4{grid-template-columns:repeat(4,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:28px;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(20,24,40,.07)}
.num{font-size:13px;color:var(--ink3);font-weight:600;letter-spacing:.04em}
.card h3{font-size:19px;margin:12px 0 8px;letter-spacing:-.01em}
.card p{color:var(--ink2);font-size:15px}
.ico{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;font-size:22px;background:linear-gradient(135deg,rgba(91,140,255,.14),rgba(255,122,198,.14))}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:56px}
.stat{text-align:center;padding:26px 10px;border-radius:20px;background:#fff;border:1px solid var(--line)}
.stat b{display:block;font-size:34px;letter-spacing:-.02em}
.stat span{color:var(--ink2);font-size:14px}

.split{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center}
.panel{border-radius:28px;padding:36px;background:linear-gradient(140deg,#eef3ff,#f7eeff 55%,#ffeef7);border:1px solid var(--line)}
.kv{display:grid;grid-template-columns:130px 1fr;gap:12px 16px;font-size:15px}
.kv dt{color:var(--ink3)}.kv dd{color:var(--ink);word-break:break-word}

.app{display:flex;gap:18px;align-items:flex-start}
.appicon{width:64px;height:64px;border-radius:16px;flex:none;background:conic-gradient(from 160deg,var(--a1),var(--a2),var(--a3),var(--a4),var(--a1));box-shadow:0 10px 22px rgba(91,140,255,.25)}
.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.tag{font-size:12px;border:1px solid var(--line);border-radius:999px;padding:3px 10px;color:var(--ink2);background:#fff}

.contact{border-radius:32px;padding:56px;background:var(--ink);color:#fff;position:relative;overflow:hidden}
.contact .orb{opacity:.45}
.contact .h2{color:#fff}.contact .lead{color:#c9cbd4}
.contact .kv dt{color:#9a9daa}.contact .kv dd{color:#fff}
.contact .inner{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:40px}

/* doc pages */
.doc{max-width:820px;margin:0 auto;padding:72px 24px 96px}
.doc h1{font-size:clamp(30px,4.5vw,46px);letter-spacing:-.02em;line-height:1.15;margin:12px 0 10px}
.doc .meta{color:var(--ink3);font-size:14px;margin-bottom:40px}
.doc h2{font-size:21px;margin:38px 0 12px;letter-spacing:-.01em}
.doc p,.doc li{color:var(--ink2);font-size:16px;margin-bottom:12px}
.doc ul{padding-left:22px}
.doc .box{border:1px solid var(--line);background:var(--bg2);border-radius:18px;padding:22px 24px;margin:20px 0}

/* footer */
footer{border-top:1px solid var(--line);padding:56px 0 40px;font-size:14px;color:var(--ink2)}
.fgrid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px}
footer h4{color:var(--ink);font-size:14px;margin-bottom:14px}
footer li{list-style:none;margin-bottom:9px}
footer a:hover{color:var(--ink)}
.copy{margin-top:44px;padding-top:22px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--ink3);font-size:13px}

/* i18n */
[data-zh]{}
html[lang="zh-CN"] .en{display:none}
html[lang="en"] .zh{display:none}

/* reveal */
.rv{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
.rv.in{opacity:1;transform:none}

@media (max-width:960px){
  .g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:1fr 1fr}
  .split,.contact .inner{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .fgrid{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  .wrap{padding:0 16px}
  .links{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;gap:0;background:#fff;border-bottom:1px solid var(--line);padding:8px 16px}
  .links.open{display:flex}
  .links a{padding:12px 0;border-bottom:1px solid var(--line)}
  .menu{display:block}
  .right .btn{display:none}
  .g4,.g3,.g2{grid-template-columns:1fr}
  .hero{padding:80px 0 70px}
  section{padding:68px 0}
  .contact{padding:32px 22px;border-radius:24px}
  .kv{grid-template-columns:1fr;gap:2px}
  .kv dd{margin-bottom:10px}
  .fgrid{grid-template-columns:1fr}
  .doc{padding:48px 16px 72px}
  .orb.o1{width:300px;height:300px}
}
@media (prefers-reduced-motion:reduce){.orb{animation:none}.rv{opacity:1;transform:none;transition:none}}

/* hero v2: 左文右机 */
.split-hero{text-align:left;padding:88px 0 96px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;position:relative}
.split-hero h1{margin:22px 0 18px;max-width:none;font-size:clamp(36px,5.2vw,64px)}
.split-hero p.sub{margin:0 0 32px;max-width:540px}
.split-hero .cta{justify-content:flex-start}
.badges{display:flex;gap:10px;margin-top:28px;flex-wrap:wrap}
.badge{font-size:13px;color:var(--ink2);border:1px solid var(--line);background:rgba(255,255,255,.7);border-radius:12px;padding:7px 14px;font-weight:600}
html[lang="zh-CN"] .split-hero h1{letter-spacing:0;line-height:1.18}
html[lang="zh-CN"] .split-hero p.sub{line-height:1.85}
html[lang="zh-CN"] .h2{letter-spacing:0}
.phone-stage{position:relative;height:560px;display:grid;place-items:center}
.phone{width:270px;height:550px;border-radius:44px;background:#0b0b0f;padding:12px;box-shadow:0 40px 80px rgba(40,40,90,.25),inset 0 0 0 2px #2a2b33;position:relative;transform:rotate(-4deg);animation:bob 7s ease-in-out infinite}
@keyframes bob{0%,100%{transform:rotate(-4deg) translateY(0)}50%{transform:rotate(-4deg) translateY(-10px)}}
.notch{position:absolute;top:20px;left:50%;transform:translateX(-50%);width:84px;height:24px;border-radius:14px;background:#0b0b0f;z-index:2}
.screen{height:100%;border-radius:34px;background:linear-gradient(180deg,#f6f7fb,#fff);padding:52px 16px 16px;display:flex;flex-direction:column;gap:12px;overflow:hidden;position:relative}
.screen b{display:block;font-size:13px;color:var(--ink)}.screen small{display:block;font-size:11px;color:var(--ink3)}
.s-top{display:flex;gap:10px;align-items:center}
.s-av{width:34px;height:34px;border-radius:50%;flex:none;background:conic-gradient(from 200deg,var(--a1),var(--a2),var(--a3),var(--a1))}
.s-hero{border-radius:20px;padding:14px;color:#fff;background:linear-gradient(135deg,var(--a1),var(--a2) 60%,var(--a3))}
.s-hero small{color:rgba(255,255,255,.85)}.s-hero b{color:#fff;font-size:26px;letter-spacing:-.02em}
.bars{display:flex;align-items:flex-end;gap:6px;height:54px;margin-top:8px}
.bars i{flex:1;background:rgba(255,255,255,.75);border-radius:6px 6px 3px 3px}
.s-row{display:flex;gap:10px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}
.dot{width:28px;height:28px;border-radius:9px;flex:none}
.d1{background:linear-gradient(135deg,#ffd36b,var(--a3))}.d2{background:linear-gradient(135deg,var(--a4),var(--a1))}.d3{background:linear-gradient(135deg,var(--a2),var(--a1))}
.s-tab{margin-top:auto;display:flex;justify-content:space-around;padding:10px 6px 2px;border-top:1px solid var(--line)}
.s-tab i{width:20px;height:20px;border-radius:7px;background:var(--line)}.s-tab i.on{background:var(--ink)}
.float{position:absolute;display:flex;gap:10px;align-items:center;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:16px;padding:10px 14px;box-shadow:0 16px 36px rgba(30,30,70,.12);animation:float 9s ease-in-out infinite}
.float b{display:block;font-size:14px}.float small{display:block;font-size:11px;color:var(--ink3)}
.fi{width:30px;height:30px;border-radius:10px;display:grid;place-items:center;color:#fff;font-weight:800;flex:none;background:linear-gradient(135deg,var(--a4),var(--a1))}
.f1{left:-28px;top:64px}.f2{right:-4px;bottom:90px;animation-delay:-4s}
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:24px}
  .split-hero{text-align:center}
  .split-hero p.sub{margin:0 auto 32px}
  .split-hero .cta,.badges{justify-content:center}
  .phone-stage{height:500px}
  .phone{transform:none;animation:none;width:240px;height:490px}
  .f1{left:calc(50% - 190px)}.f2{right:calc(50% - 190px)}
}
@media (max-width:420px){.f1{left:0}.f2{right:0}}
@media (prefers-reduced-motion:reduce){.phone,.float{animation:none}}