[hidden]{display:none!important}
:root{--bg:#fff;--alt:#f6f7fb;--ink:#14162b;--muted:#5b6078;--brand:#4f46e5;--brand-d:#3730a3;--line:#e3e5ef;--radius:14px;
font-family:system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;color:var(--ink);background:var(--bg);line-height:1.6;font-size:17px}
html[data-lang="en"] .zh,html[data-lang="zh"] .en{display:none}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
a{color:var(--brand)}
:focus-visible{outline:3px solid #f59e0b;outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:8px 12px;z-index:100}
.skip:focus{left:8px}
.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:16px;height:64px}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.2rem;color:var(--ink);text-decoration:none;margin-right:auto}
nav ul{display:flex;gap:20px;list-style:none;margin:0;padding:0}
nav a{color:var(--muted);text-decoration:none;font-weight:500}
nav a:hover{color:var(--ink)}
.lang-btn{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 12px;font:inherit;font-size:.9rem;cursor:pointer;color:var(--ink);text-decoration:none;display:inline-block;line-height:1.4}
.lang-btn:hover{border-color:var(--brand);color:var(--brand)}
.btn{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:10px;padding:12px 22px;font:inherit;font-weight:600;text-decoration:none;cursor:pointer;transition:background .15s}
.btn:hover{background:var(--brand-d)}
.btn-small{padding:8px 14px;font-size:.92rem}
.btn-ghost{background:transparent;color:var(--brand);box-shadow:inset 0 0 0 2px var(--brand)}
.btn-ghost:hover{background:#eef0ff}
section{padding:72px 0}
.alt{background:var(--alt)}
h1{font-size:clamp(2rem,5vw,3.4rem);line-height:1.15;margin:.4em 0;letter-spacing:-.02em}
h2{font-size:clamp(1.6rem,3.5vw,2.2rem);margin:0 0 .4em;letter-spacing:-.01em}
h3{margin:.3em 0;font-size:1.12rem}
.hero{padding:96px 0 80px;background:radial-gradient(1200px 500px at 80% -10%,#e0e7ff 0,transparent 60%),radial-gradient(800px 400px at -10% 110%,#ede9fe 0,transparent 60%)}
.hero .wrap{max-width:860px;text-align:center}
.lead{font-size:1.2rem;color:var(--muted);max-width:720px;margin:0 auto 28px}
.pill{display:inline-block;background:#eef0ff;color:var(--brand-d);padding:6px 14px;border-radius:999px;font-size:.9rem;font-weight:600;margin:0}
.cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.note{font-size:.92rem;color:var(--muted);margin-top:20px}
.section-sub{color:var(--muted);margin-top:0}
.cards{list-style:none;padding:0;margin:32px 0 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff;transition:box-shadow .15s,transform .15s}
.card:hover{box-shadow:0 8px 24px rgba(20,22,43,.08);transform:translateY(-2px)}
.card p{color:var(--muted);margin:.4em 0 0}
.icon{font-size:1.8rem}
.steps{list-style:none;counter-reset:s;padding:0;margin:32px 0 0;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.steps li{counter-increment:s;background:#fff;border-radius:var(--radius);padding:24px;border:1px solid var(--line)}
.steps li::before{content:counter(s);display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--brand);color:#fff;font-weight:700}
.steps p{color:var(--muted);margin:.3em 0 0}
.checks{list-style:none;padding:0}
.checks li{padding:12px 0 12px 36px;position:relative;border-bottom:1px solid var(--line)}
.checks li::before{content:"✓";position:absolute;left:4px;top:12px;color:var(--brand);font-weight:800}
details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin:10px 0}
summary{cursor:pointer;font-weight:600}
details p{color:var(--muted);margin:.6em 0 0}
.form{display:grid;gap:16px;margin-top:24px}
.field{display:grid;gap:6px}
label{font-weight:600}
input,textarea{font:inherit;padding:12px;border:1px solid #c9ccdb;border-radius:10px;width:100%;background:#fff;color:var(--ink)}
input:focus,textarea:focus{border-color:var(--brand);outline:3px solid #c7d2fe;outline-offset:0}
.privacy,.demo-note{font-size:.88rem;color:var(--muted);margin:0}
.form-error{color:#b42318;font-weight:600;margin:0}
.form .btn{justify-self:start}
.thanks{margin-top:24px;padding:24px;border-radius:var(--radius);background:#ecfdf3;border:1px solid #abefc6}
.site-footer{border-top:1px solid var(--line);padding:28px 0;font-size:.92rem}
.site-footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
.site-footer p{margin:0}
.muted{color:var(--muted)}
@media (max-width:760px){
 nav{display:none}
 .steps{grid-template-columns:1fr}
 section{padding:56px 0}
 .hero{padding:64px 0 56px}
 .form .btn{justify-self:stretch}
 .btn-small{display:none}
}