:root{
  --bg:#f7f9fc; --surface:#ffffff; --ink:#141820; --muted:#5b6474; --line:#e3e8f0;
  --accent:#1677ff; --accent-ink:#ffffff; --accent-soft:#e8f1ff; --shadow:0 10px 30px rgba(20,40,80,.08);
  --radius:18px; --max:1080px;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#0e1116; --surface:#161a22; --ink:#eef1f6; --muted:#9aa4b5; --line:#262c38;
    --accent:#4c9bff; --accent-ink:#0b1220; --accent-soft:#16233a; --shadow:0 10px 30px rgba(0,0,0,.35); }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font:17px/1.6 -apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
header.nav{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 85%,transparent);
  backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}
header.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);font-size:18px}
.brand img{width:30px;height:30px}
.brand:hover{text-decoration:none}
nav a{color:var(--muted);margin-left:22px;font-size:15px}
nav a.btn{color:var(--accent-ink)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:12px;font-weight:600;font-size:16px;
  border:1px solid transparent;transition:transform .12s ease,box-shadow .12s ease}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:var(--accent-ink);box-shadow:0 6px 18px color-mix(in srgb,var(--accent) 35%,transparent)}
.btn-ghost{background:var(--surface);color:var(--ink);border-color:var(--line)}
.btn-sm{padding:8px 14px;font-size:14px;border-radius:10px}
.hero{padding:72px 20px 40px;text-align:center}
.hero img.icon{width:120px;height:120px;filter:drop-shadow(0 12px 24px rgba(22,119,255,.25))}
.hero h1{font-size:clamp(34px,6vw,58px);line-height:1.08;letter-spacing:-.02em;margin:18px 0 14px}
.hero p.lead{font-size:clamp(18px,2.4vw,21px);color:var(--muted);max-width:640px;margin:0 auto 28px}
.cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.note{color:var(--muted);font-size:14px;margin-top:14px}
kbd{font:600 .92em ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--surface);border:1px solid var(--line);
  border-bottom-width:2px;border-radius:7px;padding:1px 7px}
.demo{margin:36px auto 0;max-width:900px;border-radius:22px;overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);background:#eef3fb}
.demo video{display:block;width:100%;height:auto}
section{padding:64px 0}
section h2{font-size:clamp(26px,3.6vw,36px);letter-spacing:-.01em;margin:0 0 10px;text-align:center}
section p.sub{color:var(--muted);text-align:center;max-width:620px;margin:0 auto 36px}
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.card h3{margin:6px 0 6px;font-size:19px}
.card p{margin:0;color:var(--muted);font-size:16px}
.step{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--accent-soft);color:var(--accent);font-weight:700}
.price{max-width:460px;margin:0 auto;text-align:center}
.price .amount{font-size:56px;font-weight:800;letter-spacing:-.02em;margin:4px 0}
.price .amount small{font-size:18px;color:var(--muted);font-weight:500}
.price ul{list-style:none;padding:0;margin:18px 0 24px;text-align:left}
.price li{padding:8px 0 8px 30px;position:relative;border-bottom:1px solid var(--line)}
.price li:last-child{border-bottom:0}
.price li::before{content:"✓";position:absolute;left:4px;color:var(--accent);font-weight:800}
.faq{max-width:760px;margin:0 auto}
details{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin-bottom:12px}
summary{cursor:pointer;font-weight:600;list-style:none}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";float:right;color:var(--muted);font-weight:400}
details[open] summary::after{content:"–"}
details p{color:var(--muted);margin:10px 0 0}
.reqs{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:24px}
.pill{background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:14px;color:var(--muted)}
footer{border-top:1px solid var(--line);padding:30px 0 46px;color:var(--muted);font-size:14px}
footer .wrap{display:flex;gap:16px;justify-content:space-between;flex-wrap:wrap}
footer a{color:var(--muted)}
.legal{max-width:760px;margin:0 auto;padding:48px 20px 70px}
.legal h1{font-size:36px;margin:0 0 6px}
.legal h2{font-size:21px;margin:30px 0 8px;text-align:left}
.legal p,.legal li{color:var(--muted)}
.legal .updated{color:var(--muted);font-size:14px}
@media (max-width:640px){ nav a:not(.btn){display:none} .hero{padding:48px 16px 32px} section{padding:48px 0} }
@media (prefers-reduced-motion: reduce){ .btn{transition:none} html{scroll-behavior:auto} }