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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>Case Converter</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .container {
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            width: 80%;
            max-width: 600px;
            padding: 20px;
            text-align: center;
        }
        .container h1 {
            color: #333;
            margin-bottom: 20px;
        }
        .input-group {
            margin-bottom: 20px;
        }
        .input-group textarea {
            width: 100%;
            height: 150px;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 4px;
            resize: none;
        }
        .buttons {
            display: flex;
            justify-content: center;
            gap: 10px;
        }
        .buttons button {
            padding: 10px 20px;
            background-color: #007BFF;
            color: #fff;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        .buttons button:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Case Converter</h1>
    <div class="input-group">
        <textarea id="input-text" placeholder="Enter text here..."></textarea>
    </div>
    <div class="buttons">
        <button onclick="convertToUppercase()">Uppercase</button>
        <button onclick="convertToLowercase()">Lowercase</button>
        <button onclick="convertToTitleCase()">Title Case</button>
        <button onclick="convertToSentenceCase()">Sentence Case</button>
    </div>
</div>

<script>
    function convertToUppercase() {
        const inputText = document.getElementById('input-text').value;
        document.getElementById('input-text').value = inputText.toUpperCase();
    }

    function convertToLowercase() {
        const inputText = document.getElementById('input-text').value;
        document.getElementById('input-text').value = inputText.toLowerCase();
    }

    function convertToTitleCase() {
        const inputText = document.getElementById('input-text').value;
        const words = inputText.split(' ');
        const titleCaseWords = words.map(word => word.charAt(0).toUpperCase() + word.slice(1).toLowerCase());
        document.getElementById('input-text').value = titleCaseWords.join(' ');
    }

    function convertToSentenceCase() {
        const inputText = document.getElementById('input-text').value;
        const sentences = inputText.split('. ');
        const sentenceCaseSentences = sentences.map(sentence => sentence.charAt(0).toUpperCase() + sentence.slice(1).toLowerCase());
        document.getElementById('input-text').value = sentenceCaseSentences.join('. ');
    }
</script>

</body>
</html>