:root {
  --bg: #f4f9fd;
  --card: #ffffff;
  --text: #23384d;
  --muted: #66798b;
  --fill: #a9d4f5;
  --primary: #2f6fa8;
  --border: #dce9f3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14202b;
    --card: #1b2b3a;
    --text: #e6eef5;
    --muted: #9db0c1;
    --fill: #2f6fa8;
    --primary: #8ec3ee;
    --border: #2a3f52;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 24px 16px 64px; }
header.site { display: flex; align-items: center; gap: 12px; padding: 16px; max-width: 720px; margin: 0 auto; }
header.site img { width: 40px; height: 40px; border-radius: 10px; }
header.site a { color: var(--text); text-decoration: none; font-weight: 700; font-size: 20px; }
nav { margin-left: auto; display: flex; gap: 16px; }
nav a { font-weight: 500; font-size: 15px; color: var(--primary); }
h1 { font-size: 30px; line-height: 1.2; margin: 8px 0 4px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--primary); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px 20px; }
ul { padding-left: 20px; }
footer { max-width: 720px; margin: 0 auto; padding: 0 16px 32px; color: var(--muted); font-size: 14px; }