body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.8;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  color: #333;
  background-color: #f9f9f9;
}

h1 {
  font-size: 28px;
  border-bottom: 3px solid #4a90e2;
  padding-bottom: 10px;
  margin-bottom: 30px;
}

h2 {
  font-size: 20px;
  margin-top: 40px;
  margin-bottom: 15px;
  color: #4a90e2;
}

p {
  margin: 10px 0;
}

ul {
  padding-left: 20px;
  margin: 10px 0;
}

li {
  margin: 8px 0;
}

a {
  color: #4a90e2;
  word-break: break-all;
}

.container {
  background-color: white;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.intro {
  margin-bottom: 30px;
}

.last-updated {
  margin-top: 40px;
  text-align: right;
  color: #666;
}

@media (max-width: 600px) {
  body {
    padding: 10px;
  }

  .container {
    padding: 20px;
  }

  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 18px;
  }
}