.container {
            max-width: 1200px;
            margin: 0 auto;
        }
/* 
        h1 {
            text-align: center;
            color: white;
            margin-bottom: 30px;
            font-size: 2.5em;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        } */

        .main-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        .panel {
            background: white;
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }

        .full-width {
            grid-column: 1 / -1;
        }

        /* h2 {
            color: #667eea;
            margin-bottom: 15px;
            font-size: 1.3em;
            border-bottom: 3px solid #667eea;
            padding-bottom: 8px;
        } */

        .input-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            color: #333;
            font-weight: 600;
        }

        input[type="text"], textarea {
            width: 100%;
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 6px;
            font-family: 'Courier New', monospace;
            font-size: 14px;
            transition: border-color 0.3s;
        }

        input[type="text"]:focus, textarea:focus {
            outline: none;
            border-color: #667eea;
        }

        textarea {
            resize: vertical;
            min-height: 150px;
        }

        .flags-container {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            margin-top: 10px;
        }

        .flag-item {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .flag-item input[type="checkbox"] {
            width: 18px;
            height: 18px;
            cursor: pointer;
        }

        .flag-item label {
            margin: 0;
            font-weight: normal;
            cursor: pointer;
        }

        .matches-section {
            background: #f8f9fa;
            border-radius: 6px;
            padding: 15px;
            margin-top: 15px;
        }

        .match-count {
            font-size: 18px;
            font-weight: bold;
            color: #28a745;
            margin-bottom: 10px;
        }

        .no-matches {
            color: #dc3545;
        }

        .match-item {
            background: white;
            border-left: 4px solid #667eea;
            padding: 12px;
            margin-bottom: 10px;
            border-radius: 4px;
        }

        .match-value {
            font-family: 'Courier New', monospace;
            font-size: 14px;
            color: #333;
            background: #e3f2fd;
            padding: 8px;
            border-radius: 4px;
            margin: 5px 0;
            word-break: break-all;
        }

        .match-info {
            font-size: 12px;
            color: #666;
            margin-top: 5px;
        }

        .groups {
            margin-top: 8px;
            padding-left: 15px;
        }

        .group-item {
            font-size: 13px;
            color: #555;
            padding: 4px 0;
        }

        .highlighted-text {
            font-family: 'Courier New', monospace;
            font-size: 14px;
            line-height: 1.8;
            white-space: pre-wrap;
            word-break: break-word;
            background: #f8f9fa;
            padding: 15px;
            border-radius: 6px;
        }

        .highlight {
            background-color: #ffd700;
            padding: 2px 4px;
            border-radius: 3px;
            font-weight: bold;
        }

        .examples {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 10px;
            margin-top: 15px;
        }

        .example-btn {
            padding: 10px;
            background: #e3f2fd;
            border: 2px solid #667eea;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s;
            font-size: 13px;
        }

        .example-btn:hover {
            background: #667eea;
            color: white;
            transform: translateY(-2px);
        }

        .error-message {
            background: #ffe6e6;
            border-left: 4px solid #dc3545;
            padding: 12px;
            border-radius: 4px;
            color: #dc3545;
            margin-top: 10px;
        }

        .stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 15px;
            margin-top: 15px;
        }

        .stat-box {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 15px;
            border-radius: 8px;
            text-align: center;
        }

        .stat-value {
            font-size: 28px;
            font-weight: bold;
        }

        .stat-label {
            font-size: 12px;
            opacity: 0.9;
            margin-top: 5px;
        }

        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            
            h1 {
                font-size: 1.8em;
            }
        }