* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Noto Sans JP', sans-serif;
  }
  
  body {
    background: linear-gradient(to bottom right, #e0f7fa, #ffffff);
    color: #333;
  }
  
  header {
    background-color: #00bcd4;
    color: white;
    padding: 20px 40px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  }
  
  header h1 {
    font-size: 2rem;
  }
  
  nav {
    margin-top: 10px;
  }
  
  nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
    font-weight: bold;
  }
  
  .hero {
    text-align: center;
    padding: 80px 20px;
  }
  
  .hero h2 {
    font-size: 2.5rem;
    color: #00796b;
  }
  
  .hero p {
    margin-top: 20px;
    font-size: 1.2rem;
    color: #555;
  }
  
  .btn {
    display: inline-block;
    margin-top: 30px;
    padding: 12px 24px;
    background-color: #00acc1;
    color: white;
    text-decoration: none;
    border-radius: 30px;
    transition: background-color 0.3s ease;
  }
  
  .btn:hover {
    background-color: #00838f;
  }
  
  footer {
    text-align: center;
    padding: 30px 20px;
    background-color: #f1f1f1;
    color: #777;
    margin-top: 60px;
  }