* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            background: white;
            border-radius: 12px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 30px;
            text-align: center;
        }

        .header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
        }

        .header p {
            font-size: 1.1em;
            opacity: 0.9;
        }

        .content {
            padding: 40px;
        }

        .section {
            margin-bottom: 30px;
        }

        .section h2 {
            color: #667eea;
            margin-bottom: 15px;
            font-size: 1.5em;
        }

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

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

        select {
            width: 100%;
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 6px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

        select:focus {
            outline: none;
            border-color: #667eea;
        }

        input[type="text"] {
            width: 100%;
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 6px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

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

        .file-input-wrapper {
            position: relative;
            overflow: hidden;
            display: inline-block;
            width: 100%;
        }

        .file-input-wrapper input[type=file] {
            position: absolute;
            left: -9999px;
        }

        .file-input-label {
            display: block;
            padding: 20px;
            background: #f5f5f5;
            border: 2px dashed #ccc;
            border-radius: 6px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
        }

        .file-input-label:hover {
            background: #ebebeb;
            border-color: #667eea;
        }

        .file-input-label.has-files {
            background: #e8f5e9;
            border-color: #4caf50;
        }

        button {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 15px 40px;
            font-size: 18px;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            width: 100%;
        }

        button:hover:not(:disabled) {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
        }

        button:active {
            transform: translateY(0);
        }

        button:disabled {
            background: #ccc;
            cursor: not-allowed;
            transform: none;
        }

        .results {
            margin-top: 30px;
            display: none;
        }

        .results.show {
            display: block;
        }

        .file-result {
            background: #f9f9f9;
            border: 1px solid #e0e0e0;
            border-radius: 6px;
            padding: 15px;
            margin-bottom: 15px;
        }

        .file-result h3 {
            color: #667eea;
            margin-bottom: 10px;
            font-size: 1.2em;
            word-break: break-word;
        }

        .file-result .changes {
            background: white;
            padding: 10px;
            border-radius: 4px;
            margin-top: 10px;
        }

        .change-item {
            padding: 5px;
            margin: 5px 0;
            font-family: 'Courier New', monospace;
            font-size: 13px;
        }

        .change-item.added {
            background: #e8f5e9;
            color: #2e7d32;
        }

        .download-btn {
            background: linear-gradient(135deg, #4caf50 0%, #45a049 100%);
            margin-top: 20px;
        }

        .warning {
            background: #fff3cd;
            border: 1px solid #ffc107;
            color: #856404;
            padding: 15px;
            border-radius: 6px;
            margin-bottom: 20px;
        }

        .info-box {
            background: #e3f2fd;
            border-left: 4px solid #2196f3;
            padding: 15px;
            margin-bottom: 20px;
            border-radius: 4px;
        }

        .info-box h3 {
            color: #1976d2;
            margin-bottom: 10px;
        }

        .info-box ul {
            margin-left: 20px;
        }

        .info-box li {
            margin: 5px 0;
        }

        .progress {
            display: none;
            margin-top: 20px;
        }

        .progress.show {
            display: block;
        }

        .progress-bar {
            width: 100%;
            height: 30px;
            background: #f0f0f0;
            border-radius: 15px;
            overflow: hidden;
            position: relative;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
            transition: width 0.3s;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 600;
        }

        .stats-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
            margin-top: 20px;
            margin-bottom: 30px;
        }

        .stat-card {
            background: #f5f5f5;
            padding: 15px;
            border-radius: 6px;
            text-align: center;
        }

        .stat-card .number {
            font-size: 2em;
            font-weight: bold;
            color: #667eea;
        }

        .stat-card .label {
            color: #666;
            margin-top: 5px;
        }

        .group-header {
            color: #667eea;
            margin: 30px 0 15px 0;
            padding-bottom: 10px;
            border-bottom: 2px solid #667eea;
            font-size: 1.3em;
        }