/* 基本設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
  }
  
  .container {
    width: 80%;
    margin: 0 auto;
  }
  
  /* ヘッダー */
  header {
    background-color: #333;
    color: white;
    padding: 20px 0;
  }
  
  header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  header .logo {
    font-size: 24px;
    font-weight: bold;
  }
  
  header nav ul {
    list-style-type: none;
    display: flex;
  }
  
  header nav ul li {
    margin-left: 20px;
  }
  
  header nav ul li a {
    text-decoration: none;
    color: white;
    font-weight: 500;
    transition: color 0.3s;
  }
  
  header nav ul li a:hover {
    color: #00bcd4;
  }
  
  /* ヒーローセクション */
  .hero {
    background: url('https://source.unsplash.com/1600x900/?nature,water') no-repeat center center/cover;
    color: white;
    padding: 100px 0;
    text-align: center;
  }
  
  .hero h2 {
    font-size: 48px;
    margin-bottom: 20px;
  }
  
  .hero p {
    font-size: 20px;
    margin-bottom: 30px;
  }
  
  .hero .cta-button {
    padding: 10px 30px;
    background-color: #00bcd4;
    color: white;
    text-decoration: none;
    font-weight: bold;
    border-radius: 5px;
    transition: background-color 0.3s;
  }
  
  .hero .cta-button:hover {
    background-color: #007c91;
  }
  
  /* 特徴セクション */
  .features {
    background-color: #ffffff;
    padding: 60px 0;
  }
  
  .features .container {
    display: flex;
    justify-content: space-between;
  }
  
  .feature {
    width: 30%;
    text-align: center;
  }
  
  .feature h3 {
    font-size: 24px;
    margin-bottom: 10px;
  }
  
  .feature p {
    font-size: 16px;
    color: #555;
  }
  
  /* フッター */
  footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
  }