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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>Responsive Web Page</title>
    <style>
        /* CSS Variables for consistent theming */
        :root {
            --primary-color: #3498db;
            --secondary-color: #2c3e50;
            --background-color: #f4f4f4;
            --card-bg: #ffffff;
            --text-color: #333333;
            --spacing-unit: 16px;
            --border-radius: 8px;
            --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--background-color);
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
        }

        .container {
            width: 100%;
            max-width: 800px;
            padding: var(--spacing-unit);
        }

        header {
            text-align: center;
            margin-bottom: var(--spacing-unit);
        }

        h1 {
            color: var(--secondary-color);
            margin-bottom: 0.5em;
        }

        .card {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: var(--spacing-unit);
            margin-bottom: var(--spacing-unit);
        }

        .card-header {
            font-weight: bold;
            font-size: 1.2em;
            margin-bottom: var(--spacing-unit);
            border-bottom: 2px solid var(--primary-color);
            padding-bottom: 0.5em;
        }

        p {
            margin-bottom: var(--spacing-unit);
        }

        .code-block {
            background-color: #2d2d2d;
            color: #f8f8f2;
            padding: var(--spacing-unit);
            border-radius: var(--border-radius);
            overflow-x: auto;
            font-family: 'Courier New', Courier, monospace;
            font-size: 0.9em;
        }

        .footer {
            text-align: center;
            margin-top: var(--spacing-unit);
            font-size: 0.8em;
            color: #777;
        }

        .footer a {
            color: var(--primary-color);
            text-decoration: none;
        }

        /* Responsive adjustments */
        @media (max-width: 600px) {
            .container {
                padding: var(--spacing-unit) * 0.5;
            }

            .card {
                padding: var(--spacing-unit) * 0.5;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <header>
            <h1>Responsive Web Page</h1>
            <p>This is a responsive web page demonstrating modern CSS.</p>
        </header>

        <main>
            <section class="card">
                <div class="card-header">Concept</div>
                <p>This page uses CSS variables, Flexbox for layout, and Media Queries for responsiveness. It adapts to different screen sizes, from mobile phones to desktop computers.</p>
            </section>

            <section class="card">
                <div class="card-header">Example Code</div>
                <p>The following CSS demonstrates how to define variables and use Flexbox:</p>
                <div class="code-block">
<pre>:root {
  --primary-color: #3498db;
  --spacing-unit: 16px;
}

.container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-unit);
}

@media (max-width: 600px) {
  .container {
    padding: 8px;
  }
}</pre>
                </div>
            </section>
        </main>

        <footer class="footer">
            <p>Built with anycoder</p>
            <a href="https://huggingface.co/spaces/akhaliq/anycoder" target="_blank">Built with anycoder</a>
        </footer>
    </div>
</body>
</html>