:root{--bg:#f6f7f9;--card:#fff;--ink:#12151a;--muted:#6b7280;--line:#e5e7eb;--accent:#2563eb}
@media (prefers-color-scheme:dark){:root{--bg:#0d1016;--card:#161a22;--ink:#eef1f6;--muted:#9aa3b2;--line:#252b36;--accent:#60a5fa}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.wrap{max-width:760px;margin:0 auto;padding:48px 20px 80px}
h1{font-size:28px;letter-spacing:-.02em;margin:0 0 6px}
h2{font-size:18px;margin:32px 0 8px}
.sub{color:var(--muted);font-size:14px;margin-bottom:28px}
p,li{color:var(--ink)}
ul{padding-left:20px}
a{color:var(--accent)}
footer{margin-top:48px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;margin-top:20px}