:root{--fg:#1d1d1f;--muted:#6e6e73;--line:#e5e5ea;--bg:#fff;--card:#f5f5f7;--accent:#0a66ff}
@media (prefers-color-scheme:dark){:root{--fg:#f5f5f7;--muted:#a1a1a6;--line:#2c2c2e;--bg:#000;--card:#1c1c1e;--accent:#4b8dff}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Helvetica Neue","PingFang SC","Hiragino Sans GB",sans-serif}
a{color:var(--accent);text-decoration:none}
.nav{display:flex;justify-content:space-between;align-items:center;max-width:960px;margin:0 auto;padding:18px 20px}
.brand{display:flex;gap:8px;align-items:center;color:var(--fg);font-weight:600}
.brand img{border-radius:6px}
.lang{color:var(--muted);font-size:14px}
main{max-width:960px;margin:0 auto;padding:0 20px 40px}
.narrow{max-width:680px}
.hero{text-align:center;padding:48px 0 32px}
.hero img{border-radius:28px}
h1{font-size:40px;line-height:1.15;margin:20px 0 12px;letter-spacing:-.02em}
.legal h1{font-size:32px}
h2{font-size:24px;margin:40px 0 14px}
.legal h2{font-size:18px;margin:28px 0 6px}
.sub{color:var(--muted);font-size:19px;max-width:640px;margin:0 auto 24px}
.download{display:inline-block;padding:12px 22px;border-radius:12px;background:var(--card);color:var(--muted);font-weight:600}
.req,.note{color:var(--muted);font-size:14px}
.free{columns:2;column-gap:32px;padding-left:20px}
.free li{break-inside:avoid;margin-bottom:8px}
.plans{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.plan{background:var(--card);border-radius:16px;padding:22px}
.plan h3{margin:0 0 8px;font-size:20px}
.plan p{color:var(--muted);margin:0 0 16px;font-size:15px}
.buys{display:flex;flex-wrap:wrap;gap:8px}
.buy{padding:9px 14px;border-radius:10px;border:1px solid var(--line);color:var(--fg);font-weight:500;font-size:15px}
.buy.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.amt{font-weight:700}
details{border-top:1px solid var(--line);padding:12px 0}
summary{cursor:pointer;font-weight:600}
footer{display:flex;flex-wrap:wrap;gap:18px;justify-content:center;padding:28px 20px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}
footer a{color:var(--muted)}
.thanks main{padding-top:40px}
.thanks .key{font:600 20px ui-monospace,Menlo,monospace;background:var(--card);padding:14px 16px;border-radius:12px;word-break:break-all}
.thanks .btn{display:inline-block;padding:11px 18px;border-radius:10px;background:var(--accent);color:#fff;font-weight:600;margin-right:8px}
.thanks .btn2{padding:10px 16px;border-radius:10px;border:1px solid var(--line);background:transparent;color:var(--fg);font:inherit;cursor:pointer}
.thanks .label{color:var(--muted);margin-bottom:6px}
.hint{color:var(--muted)}
@media (max-width:720px){h1{font-size:30px}.plans{grid-template-columns:1fr}.free{columns:1}}