body {
  font-family: "Hiragino Kaku Gothic ProN", sans-serif;
  background-color: #f0f4f8;
  margin: 0;
  padding: 0;
  color: #333;
}

header {
  background-color: #2c3e50;
  color: #fff;
  padding: 2rem;
  text-align: center;
}

main {
  padding: 2rem;
}

.youkai-section {
  margin-bottom: 3rem;
}

.youkai-section h2 {
  border-bottom: 2px solid #3498db;
  padding-bottom: 0.5rem;
  color: #2c3e50;
}

.youkai-card {
  background-color: #fff;
  border: 1px solid #ddd;
  padding: 1rem;
  margin-top: 1rem;
  border-radius: 8px;
  box-shadow: 2px 2px 5px rgba(0,0,0,0.1);
}

footer {
  background-color: #2c3e50;
  color: #fff;
  text-align: center;
  padding: 1rem;
}