.panel {
            margin-bottom: 20px;
        }
        .panel-heading {
            padding: 12px 15px;
        }
        .panel-body {
            padding: 20px;
        }
        .tool-section {
            margin-bottom: 25px;
            padding: 20px;
            background: #fff;
            border-radius: 5px;
            border: 1px solid #ddd;
        }
        .result-item {
            padding: 8px 12px;
            border-bottom: 1px solid #eee;
            font-family: monospace;
            font-size: 13px;
            line-height: 1.4;
        }
        .result-item:last-child {
            border-bottom: none;
        }
        .result-item:hover {
            background-color: #f9f9f9;
        }
        .match-highlight {
            background-color: #ffeb3b;
            padding: 2px 4px;
            border-radius: 3px;
        }
        .tooltip {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: #333;
            color: #fff;
            padding: 12px 18px;
            border-radius: 4px;
            opacity: 0;
            transition: opacity 0.3s;
            z-index: 1000;
        }
        .tooltip.show {
            opacity: 1;
        }
        .stats {
            font-weight: bold;
            margin-top: 15px;
            padding: 12px;
            background: #f8f9fa;
            border-radius: 4px;
            border-left: 4px solid #337ab7;
        }
        .search-results, .replace-results {
            max-height: 250px;
            overflow-y: auto;
            margin-top: 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            padding: 0;
            background: #fff;
        }
        .empty-state {
            padding: 15px;
            text-align: center;
            color: #999;
        }
        .text-area {
            width: 100%;
            min-height: 250px;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-family: monospace;
            font-size: 14px;
            line-height: 1.5;
            resize: vertical;
        }
        .text-area:focus {
            outline: none;
            border-color: #66afe9;
            box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, .6);
        }
        .btn-action {
            margin-right: 8px;
            margin-bottom: 10px;
        }
        .loading-indicator {
            display: inline-block;
            margin-left: 10px;
            color: #337ab7;
        }
        .section-title {
            margin-top: 0;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #eee;
            color: #337ab7;
        }
        .form-group {
            margin-bottom: 18px;
        }