:root{--bg:#fbfaf7;--fg:#1d1d1b;--muted:#5f5e58;--line:#e4e1d8;--accent:#1f6f5c}
@media (prefers-color-scheme:dark){:root{--bg:#141413;--fg:#ecebe6;--muted:#a3a198;--line:#2c2b28;--accent:#5cc2a6}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line)}
header .wrap{display:flex;justify-content:space-between;align-items:center;height:64px}
header a{color:var(--fg);text-decoration:none;font-weight:600}
nav a{font-weight:400;color:var(--muted);margin-left:20px}
nav a:hover{color:var(--fg)}
main{padding:56px 0 72px}
h1{font-size:40px;line-height:1.15;margin:0 0 16px;letter-spacing:-.01em}
h2{font-size:22px;margin:40px 0 8px}
h3{font-size:17px;margin:24px 0 4px}
p,li{color:var(--fg)}
.lead{font-size:20px;color:var(--muted);margin-bottom:32px}
.muted{color:var(--muted);font-size:15px}
a{color:var(--accent)}
.card{border:1px solid var(--line);border-radius:12px;padding:24px;margin:24px 0}
.card h2{margin-top:0}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:10px 18px;border-radius:8px;text-decoration:none;font-weight:600}
footer{border-top:1px solid var(--line);padding:24px 0;font-size:14px;color:var(--muted)}
ul{padding-left:22px}