main.blog {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

main.blog h1 {
  font-size: 2rem;
  margin-bottom: 30px;
  color: #000;
  border-bottom: 2px solid #000;
  padding-bottom: 10px;
}

main.blog section {
  margin-bottom: 30px;
}

main.blog h2 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: #333;
}

main.blog p {
  line-height: 1.8;
  color: #555;
}

main.blog a {
  color: #005bac;
  text-decoration: underline;
}

main.blog a:hover {
  text-decoration: none;
  color: #003d7c;
}

main.blog .eyecatch {
  margin-bottom: 30px;
}

main.blog .eyecatch img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

/* モバイル対応 */
@media (max-width: 768px) {
  main.blog {
    padding: 0 10px;
  }

  main.blog h1 {
    font-size: 1.5rem;
  }

  main.blog h2 {
    font-size: 1rem;
  }
}