body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.6;
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
            color: #333;
        }

        h1 {
            color: #2c3e50;
            text-align: center;
        }

        .controls {
            margin-bottom: 20px;
            padding: 15px;
            background: #f8f9fa;
            border-radius: 8px;
            text-align: center;
            border: 1px solid #e9ecef;
        }

        #error-msg {
            color: #d32f2f;
            margin-top: 10px;
            display: none;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
        }

        th,
        td {
            padding: 12px 15px;
            text-align: left;
            border-bottom: 1px solid #e0e0e0;
            vertical-align: top;
        }

        th {
            background-color: #f5f5f5;
            font-weight: 600;
            color: #555;
            width: 50%;
        }

        tr:hover {
            background-color: #fafafa;
        }

        .device-tag {
            display: inline-block;
            background: #e3f2fd;
            color: #0d47a1;
            padding: 2px 8px;
            border-radius: 12px;
            font-size: 0.9em;
            margin: 2px;
            white-space: nowrap;
        }

        .device-tag.tablet {
            background: #e8f5e9;
            color: #1b5e20;
        }