:root{--bg:#ffffff;--fg:#1a1a1f;--muted:#5d5d6b;--accent:#4b5bdc;--line:#e6e6ec}
@media (prefers-color-scheme:dark){:root{--bg:#0f0f14;--fg:#ececf1;--muted:#a0a0ae;--accent:#8c97ff;--line:#26262f}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,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;flex-wrap:wrap}
.brand{font-weight:700;font-size:18px;color:var(--fg);text-decoration:none}
nav a{color:var(--muted);text-decoration:none;margin-left:20px;font-size:15px}
nav a:hover{color:var(--fg)}
main{padding:56px 0 72px}
h1{font-size:36px;line-height:1.2;margin:0 0 16px}
h2{font-size:20px;margin:36px 0 8px}
p,li{color:var(--fg)}
.lead{font-size:19px;color:var(--muted)}
a{color:var(--accent)}
.muted{color:var(--muted);font-size:14px}
footer{border-top:1px solid var(--line);padding:24px 0;font-size:14px;color:var(--muted)}
footer a{color:var(--muted);margin-right:16px}