:root{--bg:#f7f7f5;--fg:#1d1d1b;--muted:#6b6b66;--accent:#2f6fde}
@media (prefers-color-scheme:dark){:root{--bg:#161615;--fg:#ececea;--muted:#9a9a94;--accent:#7aa5f0}}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,"Apple SD Gothic Neo","Malgun Gothic",sans-serif}
main{max-width:640px;margin:0 auto;padding:72px 16px 32px}
h1{font-size:28px;margin:0 0 8px}
p{color:var(--muted)}
.btn{display:inline-block;padding:10px 18px;border-radius:8px;background:var(--accent);color:#fff;text-decoration:none;font-weight:600}
footer{max-width:640px;margin:0 auto;padding:24px 16px;color:var(--muted);font-size:14px}
footer a{color:inherit}