/* GitHub Pages風のシンプルなスタイル */
body {
  font-family: 'Segoe UI', 'Hiragino Sans', 'Meiryo', sans-serif;
  background: #f6f8fa;
  margin: 0;
  padding: 0;
}
header, footer {
  background: #24292f;
  color: #fff;
  padding: 1em 0;
  text-align: center;
}
nav a {
  color: #fff;
  margin: 0 1em;
  text-decoration: none;
}
.markdown-body {
  max-width: 800px;
  margin: 2em auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  padding: 2em;
}
h1, h2 {
  border-bottom: 1px solid #eee;
  padding-bottom: 0.3em;
}
ul {
  padding-left: 1.5em;
}