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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Cipher Tool</title>
</head>
<body>
    <h1>Message Encryptor</h1>
    <textarea id="inputText" placeholder="Enter your message here"></textarea><br>
    <button onclick="encryptMessage()">Encrypt</button>
    <h2>Encrypted Message</h2>
    <p id="outputText"></p>

    <script>
        function encryptMessage() {
            let input = document.getElementById("inputText").value;
            let encrypted = '';

            for (let char of input) {
                if (char >= 'A' && char <= 'Z') {
                    encrypted += String.fromCharCode(((char.charCodeAt(0) - 65 + 3) % 26) + 65);
                } else if (char >= 'a' && char <= 'z') {
                    encrypted += String.fromCharCode(((char.charCodeAt(0) - 97 + 3) % 26) + 97);
                } else {
                    encrypted += char; // Non-letter characters remain unchanged
                }
            }

            document.getElementById("outputText").innerText = encrypted;
        }
    </script>
</body>
</html>
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