:root{--bg:#fff;--fg:#111;--mute:#666;--line:#e5e5e5}
@media (prefers-color-scheme:dark){:root{--bg:#0d0d0d;--fg:#f2f2f2;--mute:#999;--line:#262626}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,sans-serif}
.wrap{max-width:680px;margin:0 auto;padding:48px 20px 64px}
header{display:flex;justify-content:space-between;align-items:center;margin-bottom:56px}
.logo{font-weight:800;letter-spacing:.08em;font-size:20px;color:var(--fg);text-decoration:none}
nav a{color:var(--mute);text-decoration:none;margin-left:18px;font-size:14px}
nav a:hover{color:var(--fg)}
h1{font-size:40px;line-height:1.1;margin:0 0 16px;letter-spacing:-.02em}
h2{font-size:18px;margin:36px 0 8px}
p,li{color:var(--fg)}
.lead{font-size:20px;color:var(--mute);margin:0 0 32px}
.muted{color:var(--mute);font-size:14px}
a{color:inherit}
footer{margin-top:72px;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--mute)}