<html>

    <head>

        <meta charset="utf-8">

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        <title>Advanced Speaker Design and Crossover Calculator</title>

        <meta name="description" content="An advanced speaker design and crossover calculator for optimal audio performance.">

        <meta name="keywords" content="speaker design, crossover calculator, audio performance">



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        <script type="text/javascript">

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        <style>

            /* App CSS Goes Here */

            body {

                font-family: 'Arial', sans-serif;

                background-color: #f8f9fa;

            }

            

            .container {

                max-width: 800px;

                margin: 0 auto;

                padding: 20px;

                background-color: #fff;

                border-radius: 10px;

                box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);

            }

            

            h1 {

                text-align: center;

                margin-bottom: 20px;

                color: #333;

            }

            

            .form-group {

                margin-bottom: 20px;

            }

            

            label {

                font-weight: bold;

                color: #555;

            }

            

            input[type="text"],

            select {

                width: 100%;

                padding: 10px;

                border-radius: 5px;

                border: 1px solid #ccc;

            }

            

            .btn {

                display: inline-block;

                padding: 10px 20px;

                background-color: #007bff;

                color: #fff;

                font-weight: bold;

                text-decoration: none;

                border-radius: 5px;

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            .btn:hover {

                background-color: #0056b3;

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            .result {

                margin-top: 20px;

                padding: 20px;

                background-color: #f8f9fa;

                border-radius: 5px;

                border: 1px solid #ccc;

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            .result-title {

                margin-bottom: 10px;

                font-weight: bold;

                color: #555;

            }

            

            .result-content {

                color: #333;

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        </style>

    </head>

    <body>

        <div id="main-container" class="container">

            <h1>Advanced Speaker Design and Crossover Calculator</h1>

            

            <form>

                <div class="form-group">

                    <label for="driver-selection">Driver Selection:</label>

                    <select id="driver-selection">

                        <option value="driver1">Driver 1</option>

                        <option value="driver2">Driver 2</option>

                        <option value="driver3">Driver 3</option>

                    </select>

                </div>

                

                <div class="form-group">

                    <label for="enclosure-type">Enclosure Type:</label>

                    <select id="enclosure-type">

                        <option value="enclosure1">Enclosure 1</option>

                        <option value="enclosure2">Enclosure 2</option>

                        <option value="enclosure3">Enclosure 3</option>

                    </select>

                </div>

                

                <div class="form-group">

                    <label for="crossover-topology">Crossover Topology:</label>

                    <select id="crossover-topology">

                        <option value="topology1">Topology 1</option>

                        <option value="topology2">Topology 2</option>

                        <option value="topology3">Topology 3</option>

                    </select>

                </div>

                

                <button type="submit" class="btn">Calculate</button>

            </form>

            

            <div class="result">

                <div class="result-title">Frequency Response Simulation:</div>

                <div class="result-content">Simulation results will be displayed here.</div>

            </div>

        </div>

    </body>

</html>