:root{
  --ink:#0f1222;--ink-2:#2a2f45;--muted:#5d6380;--line:#e3e5ee;--soft:#f5f6fa;--paper:#ffffff;
  --accent:#5b4cf0;--accent-2:#14b8a6;--accent-ink:#3b2fd0;--dark:#0d0f1e;--dark-2:#171a2e;
  --radius:18px;--max:1180px;
  --font:"Segoe UI",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--paper);line-height:1.65;font-size:16px}
img,svg{display:block;max-width:100%}
a{color:var(--accent-ink)}
h1,h2,h3{line-height:1.15;margin:0;letter-spacing:-.02em}
p{margin:0}

/* language switching */
html[data-lang="en"] [data-l="zh"],html[data-lang="zh"] [data-l="en"]{display:none!important}

.skip-link{position:absolute;left:-9999px;top:8px;background:var(--ink);color:#fff;padding:8px 14px;border-radius:8px;z-index:100}
.skip-link:focus{left:16px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* header */
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(160%) blur(12px);-webkit-backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:#0b1238;font-weight:800;letter-spacing:-.01em;margin-right:auto}
.brand-mark{width:34px;height:34px;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text small{font-size:10px;letter-spacing:.32em;color:#5a6785;font-weight:600;margin-top:2px}
.site-nav{display:flex;gap:26px}
.site-nav a{color:var(--ink-2);text-decoration:none;font-size:15px;font-weight:500}
.site-nav a:hover,.site-nav a[aria-current="true"]{color:var(--accent-ink)}
.lang{display:flex;border:1px solid var(--line);border-radius:999px;padding:3px}
.lang button{font:inherit;font-size:13px;font-weight:600;border:0;background:none;color:var(--muted);padding:5px 12px;border-radius:999px;cursor:pointer}
.lang button[aria-pressed="true"]{background:var(--ink);color:#fff}

/* buttons */
.button{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:999px;font-weight:600;text-decoration:none;font-size:15px;transition:transform .15s ease,background .15s ease}
.button:hover{transform:translateY(-1px)}
.button.primary{background:var(--accent);color:#fff}
.button.primary:hover{background:var(--accent-ink)}
.button.ghost{color:var(--ink);border:1px solid var(--line);background:#fff}
.button svg{width:18px;height:18px}

/* hero */
.hero{position:relative;overflow:hidden;background:radial-gradient(1200px 520px at 85% -10%,rgba(91,76,240,.16),transparent 60%),radial-gradient(800px 420px at -10% 110%,rgba(20,184,166,.14),transparent 60%),var(--soft)}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;padding-top:96px;padding-bottom:104px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-ink)}
.eyebrow::before{content:"";width:22px;height:2px;background:currentColor;border-radius:2px}
.hero h1{font-size:clamp(38px,5.4vw,64px);margin:18px 0 22px;font-weight:750}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-description{font-size:18px;color:var(--ink-2);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:36px;padding:0;list-style:none}
.hero-tags li{font-size:13px;font-weight:600;color:var(--ink-2);background:#fff;border:1px solid var(--line);padding:6px 12px;border-radius:999px}

.hero-visual{position:relative;aspect-ratio:1/1;max-width:460px;width:100%;justify-self:end}
.panel{position:absolute;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 24px 60px -24px rgba(15,18,34,.25)}
.panel-code{inset:6% 14% 30% 0;background:var(--dark);border-color:var(--dark-2);padding:22px;color:#c9cbe0;font:13px/1.9 ui-monospace,SFMono-Regular,Consolas,monospace;overflow:hidden}
.panel-code .dots{display:flex;gap:6px;margin-bottom:16px}
.panel-code .dots i{width:10px;height:10px;border-radius:50%;background:#3a3e5a}
.panel-code .k{color:#a59bff}.panel-code .s{color:#5eead4}.panel-code .c{color:#6b7090}
.panel-chat{right:0;bottom:4%;width:62%;padding:18px;display:grid;gap:10px}
.bubble{padding:10px 14px;border-radius:14px;font-size:13.5px;line-height:1.45;max-width:88%}
.bubble.in{background:var(--soft);color:var(--ink-2);border-bottom-left-radius:4px}
.bubble.out{background:var(--accent);color:#fff;justify-self:end;border-bottom-right-radius:4px}
.panel-stat{right:0;top:0;padding:14px 18px;display:flex;align-items:center;gap:12px}
.panel-stat .dot{width:10px;height:10px;border-radius:50%;background:var(--accent-2);box-shadow:0 0 0 6px rgba(20,184,166,.15)}
.panel-stat b{display:block;font-size:14px}
.panel-stat span{font-size:12px;color:var(--muted)}

/* sections */
section{scroll-margin-top:80px}
.section{padding:104px 0}
.section-head{max-width:680px;margin-bottom:56px}
.section-head h2{font-size:clamp(30px,3.6vw,44px);margin:14px 0 16px;font-weight:720}
.section-head p{color:var(--muted);font-size:17px}

.services{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:32px;background:#fff;display:flex;flex-direction:column;transition:border-color .2s ease,box-shadow .2s ease}
.card:hover{border-color:#cfcaf9;box-shadow:0 20px 50px -30px rgba(91,76,240,.45)}
.card-icon{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:rgba(91,76,240,.1);color:var(--accent-ink);margin-bottom:24px}
.card-icon svg{width:24px;height:24px}
.card:nth-child(2) .card-icon{background:rgba(20,184,166,.12);color:#0f8f81}
.card:nth-child(3) .card-icon{background:rgba(15,18,34,.07);color:var(--ink)}
.card h3{font-size:22px;margin-bottom:12px}
.card p{color:var(--muted)}
.card ul{list-style:none;padding:0;margin:22px 0 0;display:grid;gap:10px;border-top:1px solid var(--line);padding-top:20px}
.card li{display:flex;gap:10px;font-size:15px;color:var(--ink-2)}
.card li::before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-top:10px}

/* dark band */
.band{background:var(--dark);color:#e7e8f3}
.band .eyebrow{color:#a59bff}
.band .section-head p{color:#a3a7c2}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid #2a2e48;counter-reset:step}
.step{padding:30px 26px 0 0}
.step+.step{padding-left:26px;border-left:1px solid #2a2e48}
.step-num{font:600 13px ui-monospace,Consolas,monospace;color:#5eead4;letter-spacing:.1em}
.step h3{font-size:19px;margin:14px 0 10px;color:#fff}
.step p{color:#a3a7c2;font-size:15px}

/* company */
.company{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start}
.company-copy p+p{margin-top:16px}
.company-copy p{color:var(--ink-2);font-size:17px}
.facts{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin:0}
.facts div{display:grid;grid-template-columns:150px 1fr;gap:16px;padding:18px 24px;border-bottom:1px solid var(--line)}
.facts div:last-child{border-bottom:0}
.facts dt{color:var(--muted);font-size:14px;font-weight:600}
.facts dd{margin:0;font-weight:600;word-break:break-word}
.facts div:nth-child(odd){background:var(--soft)}

/* contact */
.contact{background:linear-gradient(120deg,var(--accent) 0%,#4338ca 55%,#0f766e 140%);color:#fff;border-radius:28px;padding:64px;display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}
.contact .eyebrow{color:#d9d5ff}
.contact h2{font-size:clamp(28px,3.4vw,40px);margin:14px 0 14px}
.contact p{color:#e3e1ff}
.contact-box{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);border-radius:20px;padding:26px}
.contact-box span{display:block;font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#d9d5ff;font-weight:600}
.contact-box a{display:inline-block;margin-top:8px;color:#fff;font-size:22px;font-weight:700;text-decoration:none;word-break:break-all}
.contact-box a:hover{text-decoration:underline}
.brand-text>span{white-space:nowrap}
.contact-box .contact-name{margin:8px 0 20px;padding-bottom:18px;border-bottom:1px solid rgba(255,255,255,.22);color:#fff;font-size:22px;font-weight:700}

/* footer */
.footer{border-top:1px solid var(--line);padding:30px 0;color:var(--muted);font-size:14px}
.footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 24px}
.footer nav{display:flex;gap:20px}
.footer a{color:var(--ink-2);text-decoration:none}
.footer a:hover{color:var(--accent-ink)}

/* legal pages */
.legal-hero{background:var(--soft);border-bottom:1px solid var(--line)}
.legal-hero .wrap{padding-top:72px;padding-bottom:56px;max-width:860px}
.legal-hero h1{font-size:clamp(34px,4.6vw,52px);margin:14px 0 14px}
.legal-hero p{color:var(--muted)}
.legal{max-width:860px;padding-top:56px;padding-bottom:96px}
.legal h2{font-size:22px;margin:44px 0 14px}
.legal h2:first-child{margin-top:0}
.legal p,.legal li{color:var(--ink-2)}
.legal p+p{margin-top:12px}
.legal ul{padding-left:22px;margin:12px 0}
.legal li+li{margin-top:6px}
.legal .note{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin-bottom:8px}

@media (max-width:980px){
  .hero .wrap{grid-template-columns:1fr;padding-top:64px;padding-bottom:72px}
  .hero-visual{justify-self:center;max-width:420px}
  .services{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .step:nth-child(3){padding-left:0;border-left:0}
  .step{padding-bottom:30px}
  .company{grid-template-columns:1fr;gap:40px}
  .contact{grid-template-columns:1fr;padding:44px}
}
@media (max-width:720px){
  .wrap{padding:0 16px}
  .site-nav{display:none}
  .header-inner{gap:12px}
  .section{padding:72px 0}
  .section-head{margin-bottom:40px}
  .card{padding:26px}
  .steps{grid-template-columns:1fr}
  .step,.step+.step{padding:26px 0;border-left:0;border-bottom:1px solid #2a2e48}
  .facts div{grid-template-columns:1fr;gap:4px;padding:16px 18px}
  .contact{padding:32px 22px;border-radius:22px}
  .contact-box a{font-size:18px}
  .hero-description{font-size:17px}
}
@media (max-width:380px){
  .brand-text small{display:none}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button,.card{transition:none}}