body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            margin: 0;
            padding: 20px;
            background: #f5f5f5;
        }

        .header {
            background: white;
            padding: 20px;
            border-radius: 8px;
            margin-bottom: 20px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            position: sticky;
            top: 20px;
            z-index: 1000;
        }

        .header h1 {
            margin: 0 0 15px 0;
            font-size: 28px;
        }

        .selector-group {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            align-items: center;
        }

        label {
            font-weight: 600;
            color: #333;
        }

        select {
            padding: 8px 12px;
            border: 2px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
            cursor: pointer;
        }

        select:hover {
            border-color: #999;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .content {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

        .section {
            margin-bottom: 40px;
        }

        .section h2 {
            border-bottom: 2px solid #e0e0e0;
            padding-bottom: 10px;
            margin-top: 0;
        }

        .test-group {
            margin-bottom: 30px;
        }

        .test-group h3 {
            font-size: 16px;
            color: #555;
            margin-bottom: 10px;
        }

        /* Éléments de démonstration */
        .demo-box {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            margin-bottom: 15px;
        }

        .demo-item {
            flex: 1;
            min-width: 200px;
            padding: 15px;
            background: #f9f9f9;
            border: 1px solid #ddd;
            border-radius: 4px;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            margin: 15px 0;
        }

        th, td {
            border: 1px solid #ddd;
            padding: 10px;
            text-align: left;
        }

        th {
            background: #f5f5f5;
        }

        code {
            background: #f0f0f0;
            padding: 2px 4px;
            border-radius: 3px;
            font-family: 'Courier New', monospace;
        }