:root { --bg: #f5f5f7; --card: #ffffff; --text: #1d1d1f; --muted: #6e6e73; --accent: #0071e3; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #000000; --card: #1c1c1e; --text: #f5f5f7; --muted: #a1a1a6; --accent: #2997ff; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
header img { width: 56px; height: 56px; border-radius: 13px; }
header h1 { margin: 0; font-size: 28px; }
header p { margin: 2px 0 0; color: var(--muted); font-size: 15px; }
section { background: var(--card); border-radius: 16px; padding: 20px 22px; margin-bottom: 16px; }
h2 { font-size: 19px; margin: 0 0 8px; }
p, li { margin: 0 0 10px; }
ul { padding-left: 20px; margin: 0; }
a { color: var(--accent); }
nav { margin-bottom: 20px; font-size: 15px; }
nav a { margin-right: 16px; }
footer { color: var(--muted); font-size: 13px; text-align: center; margin-top: 28px; }