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HTML 

              
                <!DOCTYPE html>
<html lang="ja">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>AI会社</title>
  <link rel="stylesheet" href="style.css">
</head>

<body>
  <header>
    <h1>AI会社</h1>
    <nav>
      <ul>
        <li><a href="#">ホーム</a></li>
        <li><a href="#">サービス</a></li>
        <li><a href="#">お問い合わせ</a></li>
      </ul>
    </nav>
  </header>

  <main>
    <section class="concept">
      <h2>会社コンセプト</h2>
      <p>AIについての事業を行う会社</p>
    </section>

    <section class="services">
      <h2>事業内容</h2>
      <div class="card-container">
        <div class="card">
          <h3>AIによる自動化・効率化サービスの提供</h3>
          <p>AI技術を活用して、ビジネスプロセスを自動化し、コスト削減を図るサービスを提供しています。</p>
        </div>

        <div class="card">
          <h3>AIコンサルティングサービスの提供</h3>
          <p>企画立案から運用まで、お客様のビジネス価値を最大化するAI実装を支援するサービスを提供しています。</p>
        </div>

        <div class="card">
          <h3>AIビジネスモデルの開発・提供</h3>
          <p>AI技術を活用した新たなビジネスモデルの開発・提供により、社会の発展に貢献します。</p>
        </div>
      </div>
    </section>

    <section class="contact">
      <h2>お問い合わせ</h2>
      <form>
        <label for="name">名前:</label>
        <input type="text" id="name" name="name" required>
        <label for="email">メールアドレス:</label>
        <input type="email" id="email" name="email" required>
        <label for="message">メッセージ:</label>
        <textarea id="message" name="message" rows="5" required></textarea>
        <button type="submit">送信</button>
      </form>
    </section>
  </main>

  <footer>
    <p>&copy; 2023 AI会社. All rights reserved.</p>
  </footer>

  <script src="script.js"></script>
</body>

</html>
!

CSS 

              
                * {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: #333;
  background-color: #f9f9f9;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 30px;
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
  font-size: 24px;
  font-weight: 600;
  color: #333;
}

nav ul {
  display: flex;
  list-style: none;
}

nav li {
  margin-right: 20px;
}

nav a {
  text-decoration: none;
  color: #333;
}

nav a:hover {
  border-bottom: 2px solid #333;
}

main {
  max-width: 960px;
  margin: 30px auto;
  padding: 0 30px;
}

.concept {
  text-align: center;
  margin-bottom: 50px;
}

.concept h2 {
  font-size: 36px;
  margin-bottom: 20px;
  color: #333;
}

.concept p {
  font-size: 18px;
  color: #666;
}

.services {
  text-align: center;
  margin-bottom: 50px;
}

.services h2 {
  font-size: 36px;
  margin-bottom: 20px;
  color: #333;
}

.card-container {
  display: flex;
  justify-content: space-between;
}

.card {
  width: 300px;
  padding: 30px;
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.card h3 {
  font-size: 24px;
  margin-bottom: 20px;
  color: #333;
}

.card p {
  font-size: 18px;
  color: #666;
}

.contact {
  text-align: center;
  margin-bottom: 50px;
}

.contact h2 {
  font-size: 36px;
  margin-bottom: 20px;
  color: #333;
}

form label {
  display: block;
  font-size: 18px;
  margin-bottom: 10px;
  color: #333;
}

form input[type="text"],
form input[type="email"],
form textarea {
  width: 100%;
  padding: 10px;
  margin-bottom: 20px;
  border: 2px solid #ddd;
  border-radius: 5px;
}

form textarea {
  height: 150px;
}

form button[type="submit"] {
  padding: 10px 20px;
  background-color: #333;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

form button[type="submit"]:hover {
  background-color: #666;
}

footer {
  text-align: center;
  padding: 20px;
  background-color: #333;
  color: #fff;
}
!

JS 

              
                const form = document.querySelector('form');
const nameInput = document.querySelector('#name');
const emailInput = document.querySelector('#email');
const messageInput = document.querySelector('#message');
const errorList = document.querySelector('#errors');
const successMessage = document.querySelector('#success-message');

form.addEventListener('submit', e => {
  e.preventDefault();
  clearErrors();
  if (validateForm()) {
    const formData = new FormData(form);
    const xhr = new XMLHttpRequest();
    xhr.open('POST', 'https://example.com/api/contact');
    xhr.send(formData);
    xhr.onreadystatechange = function() {
      if (xhr.readyState === 4) {
        if (xhr.status === 200) {
          showSuccessMessage();
          clearForm();
        } else {
          showErrorMessage('An error occurred. Please try again later.');
        }
      }
    }
  }
});

function validateForm() {
  let isValid = true;
  if (nameInput.value === '') {
    showErrorMessage('Please enter your name.');
    isValid = false;
  }
  if (emailInput.value === '') {
    showErrorMessage('Please enter your email address.');
    isValid = false;
  } else if (!isValidEmail(emailInput.value)) {
    showErrorMessage('Please enter a valid email address.');
    isValid = false;
  }
  if (messageInput.value === '') {
    showErrorMessage('Please enter a message.');
    isValid = false;
  }
  return isValid;
}

function showErrorMessage(message) {
  const li = document.createElement('li');
  li.textContent = message;
  errorList.appendChild(li);
}

function clearErrors() {
  while (errorList.firstChild) {
    errorList.removeChild(errorList.firstChild);
  }
}

function showSuccessMessage() {
  successMessage.style.display = 'block';
}

function clearForm() {
  nameInput.value = '';
  emailInput.value = '';
  messageInput.value = '';
}

function isValidEmail(email) {
  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
}
!
999px

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