:root{
  --bg:#fafaff; --bg-soft:#f3f3fb; --fg:#1c1d2b; --muted:#5c5e74;
  --indigo:#6366f1; --violet:#8b5cf6; --pink:#ec4899;
  --grad:linear-gradient(120deg,#6366f1 0%,#8b5cf6 50%,#ec4899 100%);
  --card:#ffffff; --line:#e7e7f2; --maxw:1080px;
}
*{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;
  background:var(--bg); color:var(--fg); line-height:1.8; font-size:15px;
}
a{color:var(--indigo);text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:var(--indigo)}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(250,250,255,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:62px}
.nav .logo{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:600;letter-spacing:1px}
.nav .logo img{width:30px;height:30px;border-radius:8px}
.nav .links{display:flex;gap:24px;list-style:none}
.nav .links a{color:var(--muted);font-size:14px;letter-spacing:.5px;transition:color .2s}
.nav .links a:hover,.nav .links a.active{color:var(--indigo)}
.nav .burger{display:none;background:none;border:0;color:var(--indigo);font-size:24px;cursor:pointer}

/* hero */
.hero{text-align:center;padding:92px 0 76px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;top:-160px;left:50%;transform:translateX(-50%);width:680px;height:420px;
  background:radial-gradient(closest-side,rgba(139,92,246,.20),rgba(236,72,153,.10),transparent);filter:blur(20px);z-index:0}
.hero>*{position:relative;z-index:1}
.hero .splash{width:108px;height:108px;margin:0 auto 26px;border-radius:26px;box-shadow:0 18px 48px rgba(99,102,241,.32)}
.hero h1{font-size:46px;font-weight:800;letter-spacing:2px;margin-bottom:14px;line-height:1.2}
.hero .tag{font-size:17px;color:var(--muted);margin-bottom:14px}
.hero .langs{font-size:13px;color:var(--muted);letter-spacing:1px;margin-bottom:34px}
.btn{display:inline-block;padding:14px 38px;border-radius:999px;letter-spacing:1px;font-weight:600;transition:all .2s;border:1px solid var(--indigo);color:var(--indigo);background:#fff}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--grad);color:#fff;border:0;box-shadow:0 10px 28px rgba(124,82,237,.35)}
.btn-primary:hover{box-shadow:0 14px 34px rgba(124,82,237,.45)}

/* sections */
section{padding:66px 0}
.sec-title{text-align:center;font-weight:800;font-size:30px;letter-spacing:1px;margin-bottom:12px}
.sec-sub{text-align:center;color:var(--muted);font-size:14px;letter-spacing:1px;margin-bottom:44px}
.about{background:var(--bg-soft)}
.about p{max-width:780px;margin:0 auto;text-align:center;color:var(--fg);font-size:16px}

/* stats */
.stats{display:flex;gap:24px;justify-content:center;flex-wrap:wrap;max-width:820px;margin:40px auto 0}
.stats .s{flex:1;min-width:150px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;text-align:center}
.stats .s .n{font-size:30px;font-weight:800}
.stats .s .l{color:var(--muted);font-size:13px;margin-top:4px}

/* feature rows */
.feat{display:flex;align-items:center;gap:46px;max-width:920px;margin:0 auto 30px;padding:30px;
  background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:0 6px 24px rgba(40,40,90,.05);
  opacity:0;transform:translateY(24px);transition:opacity .6s,transform .6s}
.feat.show{opacity:1;transform:none}
.feat:nth-child(even){flex-direction:row-reverse}
.feat .media{flex:0 0 150px;display:flex;align-items:center;justify-content:center}
.feat .ic{width:118px;height:118px;border-radius:26px;display:flex;align-items:center;justify-content:center;background:var(--grad);box-shadow:0 12px 30px rgba(124,82,237,.30)}
.feat .ic svg{width:60px;height:60px;stroke:#fff;fill:none;stroke-width:1.8}
.feat .body{flex:1}
.feat .body .k{color:var(--violet);font-size:12px;letter-spacing:2px;font-weight:700;margin-bottom:8px}
.feat .body h3{font-size:23px;font-weight:700;margin-bottom:12px}
.feat .body p{color:var(--muted)}
.feat.lead{background:linear-gradient(120deg,rgba(99,102,241,.07),rgba(236,72,153,.07));border-color:rgba(139,92,246,.35)}
.feat.lead .body h3{font-size:27px}

/* experience */
.exp{text-align:center;background:var(--bg-soft)}
.exp .qrbox{width:200px;height:200px;margin:0 auto 18px;border:2px dashed var(--line);border-radius:16px;background:#fff;
  display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px;text-align:center;padding:16px}
.exp .row{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin-top:8px}
.exp .appnote{color:var(--muted);font-size:13px;margin-top:24px}

/* footer */
.footer{border-top:1px solid var(--line);padding:42px 0 56px;background:#fff}
.footer .disc{max-width:840px;margin:0 auto 22px;color:var(--muted);font-size:12.5px;line-height:1.9;
  background:var(--bg-soft);border-left:3px solid var(--violet);padding:14px 18px;border-radius:0 8px 8px 0}
.footer .meta{text-align:center;color:var(--muted);font-size:13px;line-height:2.1}
.footer .meta a{color:var(--muted)}
.footer .meta a:hover{color:var(--indigo)}

/* legal pages */
.legal{max-width:840px;margin:0 auto;padding:34px 24px 80px}
.legal .back{display:inline-block;margin-bottom:18px;font-size:13px}
.legal h1{font-weight:800;font-size:26px;text-align:center;margin:6px 0 6px}
.legal .legal-sub{text-align:center;color:var(--muted);font-size:14px;margin-bottom:8px}
.legal .meta{text-align:center;color:var(--muted);font-size:13px;margin-bottom:26px}
.legal h2{font-size:18px;margin:34px 0 10px;padding-bottom:6px;border-bottom:1px solid var(--line);color:var(--indigo)}
.legal h3{font-size:15px;margin:18px 0 6px}
.legal p,.legal li{font-size:15px;margin:8px 0}
.legal ul,.legal ol{padding-left:22px}
.legal .preamble{background:var(--bg-soft);border-left:3px solid var(--violet);padding:14px 18px;border-radius:0 8px 8px 0;margin:14px 0 22px}
.legal table{width:100%;border-collapse:collapse;margin:12px 0 18px;font-size:14px;background:#fff}
.legal th,.legal td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.legal th{background:var(--bg-soft);font-weight:600}
.legal code,.legal .mono{font-family:ui-monospace,Consolas,monospace;font-size:13px;background:var(--bg-soft);padding:1px 6px;border-radius:3px}
.legal .callout{background:#fff8e1;border-left:4px solid #d4a017;padding:12px 16px;border-radius:4px;margin:16px 0;font-size:14px}
.legal .en{margin-top:46px;padding-top:24px;border-top:2px dashed var(--line);color:#3a3a48}
.legal .en h2{color:#555}

/* responsive */
@media(max-width:760px){
  .nav .links{position:absolute;top:62px;left:0;right:0;flex-direction:column;gap:0;background:#fff;border-bottom:1px solid var(--line);display:none}
  .nav .links.open{display:flex}
  .nav .links a{padding:14px 24px;border-top:1px solid var(--line)}
  .nav .burger{display:block}
  .hero h1{font-size:32px}
  .feat,.feat:nth-child(even){flex-direction:column;gap:20px;text-align:center}
  .feat .media{flex:none}
}