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<!DOCTYPE html>
<html>
<head>
  <title>Form Validation</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      background-color: #f2f2f2;
      margin: 0;
      padding: 0;
    }

    .container {
      max-width: 500px;
      margin: 50px auto;
      background-color: #fff;
      padding: 20px;
      border-radius: 5px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }

    h1 {
      text-align: center;
      margin-top: 0;
      color: #333;
      padding-bottom: 10px;
      border-bottom: 1px solid #ccc;
    }

    label {
      display: block;
      margin-bottom: 5px;
      color: #333;
      font-weight: bold;
    }

    input[type="text"],
    input[type="email"],
    input[type="tel"] {
      width: 100%;
      padding: 10px;
      border: 1px solid #ccc;
      border-radius: 4px;
      box-sizing: border-box;
      margin-bottom: 15px;
      color: #333;
    }

    .error-message {
      color: red;
      font-size: 14px;
      margin-bottom: 10px;
    }

    .success-message {
      color: green;
      font-size: 16px;
      font-weight: bold;
      margin-top: 10px;
    }

    input[type="submit"] {
      background-color: #4CAF50;
      color: white;
      padding: 12px 24px;
      border: none;
      border-radius: 4px;
      cursor: pointer;
      font-size: 16px;
      transition: background-color 0.3s ease;
    }

    input[type="submit"]:hover {
      background-color: #45a049;
    }
  </style>
  <script>
    function validateForm() {
      var firstName = document.getElementById('firstName').value;
      var lastName = document.getElementById('lastName').value;
      var email = document.getElementById('email').value;
      var phone = document.getElementById('phone').value;

      // Regular expressions for validation
      var nameRegex = /^[A-Za-z]+$/;
      var emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
      var phoneRegex = /^\d{10}$/;

      // Clear previous error messages
      document.getElementById('firstNameError').textContent = '';
      document.getElementById('lastNameError').textContent = '';
      document.getElementById('emailError').textContent = '';
      document.getElementById('phoneError').textContent = '';

      // Validation for first name
      if (firstName.trim() === '') {
        document.getElementById('firstNameError').textContent = 'Please enter your first name.';
        return false;
      } else if (!firstName.match(nameRegex)) {
        document.getElementById('firstNameError').textContent = 'Please enter a valid first name.';
        return false;
      }

      // Validation for last name
      if (lastName.trim() === '') {
        document.getElementById('lastNameError').textContent = 'Please enter your last name.';
        return false;
      } else if (!lastName.match(nameRegex)) {
        document.getElementById('lastNameError').textContent = 'Please enter a valid last name.';
        return false;
      }

      // Validation for email
      if (email.trim() === '') {
        document.getElementById('emailError').textContent = 'Please enter your email address.';
        return false;
      } else if (!email.match(emailRegex)) {
        document.getElementById('emailError').textContent = 'Please enter a valid email address.';
        return false;
      }

      // Validation for phone number
      if (phone.trim() === '') {
        document.getElementById('phoneError').textContent = 'Please enter your phone number.';
        return false;
      } else if (!phone.match(phoneRegex)) {
        document.getElementById('phoneError').textContent = 'Please enter a valid phone number (10 digits).';
        return false;
      }

      // All fields are valid
      document.getElementById('successMessage').textContent = 'Form submitted successfully!';
      return true;
    }
  </script>
</head>
<body>
  <div class="container">
    <h1>Form Validate</h1>
    <form onsubmit="return validateForm()">
      <label for="firstName">First Name:</label>
      <input type="text" id="firstName" name="firstName">
      <span id="firstNameError" class="error-message"></span><br>

      <label for="lastName">Last Name:</label>
      <input type="text" id="lastName" name="lastName">
      <span id="lastNameError" class="error-message"></span><br>

      <label for="email">Email:</label>
      <input type="email" id="email" name="email">
      <span id="emailError" class="error-message"></span><br>

      <label for="phone">Phone:</label>
      <input type="tel" id="phone" name="phone">
      <span id="phoneError" class="error-message"></span><br>

      <input type="submit" value="Submit">
      <div id="successMessage" class="success-message"></div>
    </form>
  </div>
</body>
</html>