:root{--bg:#FAFAF7;--ink:#0E1410;--ink2:#3A423D;--muted:#6B7570;--line:#E4E2DA;--green:#1FAE6A;--green-deep:#0E7A47}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:'Geist',-apple-system,system-ui,sans-serif;-webkit-font-smoothing:antialiased}
*{box-sizing:border-box}
a{color:var(--ink);text-decoration:none}
a:hover{color:var(--green-deep)}
.wrap{max-width:720px;margin:0 auto;padding:0 40px}
header{position:sticky;top:0;background:rgba(250,250,247,0.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:18px 40px;max-width:1000px;margin:0 auto}
.logo{display:inline-flex;align-items:center;gap:9px;font-weight:600;font-size:17px;letter-spacing:-0.4px}
.back{font-size:14px;font-weight:500;color:var(--muted)}
main{padding:90px 0 120px}
h1{font-size:44px;font-weight:600;letter-spacing:-1.5px;line-height:1.05;margin:0}
h2{font-size:19px;font-weight:600;letter-spacing:-0.3px;margin:48px 0 0}
p,li{font-size:15.5px;line-height:1.7;color:var(--ink2)}
p{margin:14px 0 0}
ul{margin:14px 0 0;padding-left:22px}
li{margin-top:6px}
.small{font-size:13.5px;color:var(--muted)}
.updated{font-size:13.5px;color:var(--muted);margin-top:16px}
footer{border-top:1px solid var(--line)}
footer .wrap{display:flex;justify-content:space-between;align-items:center;padding-top:32px;padding-bottom:32px;max-width:1000px}

@media (max-width:600px){
.wrap{padding:0 22px}
.nav{padding:12px 18px}
main{padding:56px 0 80px}
h1{font-size:32px;letter-spacing:-1px}
footer .wrap{flex-direction:column;align-items:flex-start;gap:12px}
.back{font-size:13px}
}