/* トップページ専用スタイル */
    body {
      font-family: 'Arial', sans-serif;
      margin: 0;
      padding: 0;
      background-color: #f4f4f4;
    }

    header {
      background-color: #7289da;
      color: #fff;
      padding: 20px;
      text-align: center;
    }

    h1 {
      font-size: 2.5rem;
      margin: 0;
    }

    main {
      padding: 20px;
      text-align: center;
    }

    .cta-section {
      margin-top: 50px;
    }

    .login-btn {
      display: inline-block;
      padding: 15px 30px;
      font-size: 1.2rem;
      background-color: #7289da;
      color: #fff;
      border: none;
      border-radius: 5px;
      text-decoration: none;
      transition: background-color 0.3s ease;
    }

    .login-btn:hover {
      background-color: #5b6eae;
    }

    footer {
      margin-top: 50px;
      background-color: #f4f4f4;
      text-align: center;
      padding: 20px;
      font-size: 0.9rem;
      color: #333;
    }

    .feature-list {
      display: flex;
      justify-content: center;
      gap: 20px;
      margin-top: 40px;
    }

    .feature {
      background-color: #fff;
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      width: 30%;
    }

    .feature img {
      width: 100px;
      margin-bottom: 20px;
    }

    .feature h3 {
      font-size: 1.5rem;
    }

    .feature p {
      font-size: 1rem;
    }

    /* レスポンシブ */
    @media (max-width: 768px) {
      .feature-list {
        flex-direction: column;
        align-items: center;
      }

      .feature {
        width: 80%;
      }

      h1 {
        font-size: 2rem;
      }

      .login-btn {
        font-size: 1rem;
      }
    }