:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #15181d;
  --muted: #5d6673;
  --line: #e3e6ea;
  --accent: #1f6feb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --card: #181c22;
    --text: #e9edf2;
    --muted: #9aa4b1;
    --line: #2a3038;
    --accent: #5aa2ff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 56px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 24px; }
header img { width: 56px; height: 56px; border-radius: 13px; }
header h1 { font-size: 24px; margin: 0; }
header p { margin: 2px 0 0; color: var(--muted); }
section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
  margin-bottom: 14px;
}
h2 { font-size: 18px; margin: 0 0 8px; }
p { margin: 0 0 10px; }
p:last-child, ul:last-child { margin-bottom: 0; }
ul { margin: 0 0 10px; padding-left: 20px; }
a { color: var(--accent); }
footer { color: var(--muted); font-size: 14px; text-align: center; margin-top: 24px; }
nav { margin-top: 6px; }
nav a { margin-right: 14px; }