:root {
  --bg: #F6F7F9;
  --text: #111827;
  --muted: #64748B;
  --accent: #2563EB;
  --border: #E5E7EB;
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
  line-height: 1.6;
}
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}
h1 { font-size: 28px; margin-bottom: 8px; }
h2 { font-size: 20px; margin-top: 36px; margin-bottom: 8px; }
.meta { color: var(--muted); font-size: 14px; margin-bottom: 32px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
nav { border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 24px; }
nav a { margin-right: 16px; }
ul { padding-left: 20px; }
li { margin-bottom: 6px; }