* {
            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: 900px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            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: 28px;
            margin-bottom: 10px;
        }

        .header p {
            font-size: 14px;
            opacity: 0.9;
        }

        .content {
            padding: 40px;
        }

        .step {
            margin-bottom: 30px;
            padding: 25px;
            background: #f8f9fa;
            border-radius: 12px;
            border-left: 4px solid #667eea;
        }

        .step h3 {
            color: #333;
            margin-bottom: 15px;
            font-size: 18px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .step-number {
            background: #667eea;
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: bold;
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #333;
            font-weight: 600;
            font-size: 14px;
        }

        .form-group input,
        .form-group select {
            width: 100%;
            padding: 12px;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            font-size: 14px;
            transition: border-color 0.3s ease;
        }

        .form-group input:focus,
        .form-group select:focus {
            outline: none;
            border-color: #667eea;
        }

        .form-group small {
            display: block;
            margin-top: 5px;
            color: #666;
            font-size: 12px;
        }

        .btn {
            padding: 12px 30px;
            border: none;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-primary {
            background: #667eea;
            color: white;
        }

        .btn-primary:hover {
            background: #5568d3;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .btn-success {
            background: #28a745;
            color: white;
        }

        .btn-success:hover {
            background: #218838;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(40, 167, 69, 0.4);
        }

        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .file-input-wrapper {
            position: relative;
            display: inline-block;
        }

        input[type="file"] {
            display: none;
        }

        .file-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 30px;
            background: #667eea;
            color: white;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .file-label:hover {
            background: #5568d3;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .file-name {
            margin-top: 10px;
            color: #666;
            font-size: 14px;
        }

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

        .progress-bar {
            width: 100%;
            height: 30px;
            background: #e9ecef;
            border-radius: 15px;
            overflow: hidden;
            position: relative;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
            width: 0%;
            transition: width 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 12px;
            font-weight: bold;
        }

        .progress-text {
            margin-top: 10px;
            color: #666;
            font-size: 14px;
            text-align: center;
        }

        .results {
            display: none;
            margin-top: 30px;
            padding: 25px;
            background: #d4edda;
            border: 1px solid #c3e6cb;
            border-radius: 12px;
        }

        .results h3 {
            color: #155724;
            margin-bottom: 15px;
        }

        .stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 15px;
            margin: 20px 0;
        }

        .stat-item {
            background: white;
            padding: 15px;
            border-radius: 8px;
            text-align: center;
        }

        .stat-value {
            font-size: 24px;
            font-weight: bold;
            color: #667eea;
        }

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

        .error {
            background: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
            padding: 15px;
            border-radius: 8px;
            margin-top: 15px;
            display: none;
        }

        .success {
            background: #d4edda;
            border: 1px solid #c3e6cb;
            color: #155724;
            padding: 15px;
            border-radius: 8px;
            margin-top: 15px;
            display: none;
        }

        .icon {
            width: 16px;
            height: 16px;
        }

        .requirements {
            background: #fff3cd;
            border: 1px solid #ffeaa7;
            padding: 15px;
            border-radius: 8px;
            margin-top: 15px;
        }

        .requirements h4 {
            color: #856404;
            margin-bottom: 10px;
            font-size: 14px;
        }

        .requirements ul {
            margin-left: 20px;
            color: #856404;
            font-size: 13px;
        }

        .requirements li {
            margin: 5px 0;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .spinner {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid white;
            border-top-color: transparent;
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
        }

        .log-container {
            display: none;
            margin-top: 15px;
            max-height: 300px;
            overflow-y: auto;
            background: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 8px;
            padding: 15px;
        }

        .log-entry {
            padding: 5px 0;
            font-size: 13px;
            font-family: 'Courier New', monospace;
            color: #495057;
        }

        .log-entry.success {
            color: #28a745;
        }

        .log-entry.error {
            color: #dc3545;
        }

        .log-entry.info {
            color: #17a2b8;
        }

        .default-values-info {
            background: #e7f3ff;
            border: 1px solid #b3d9ff;
            padding: 15px;
            border-radius: 8px;
            margin-top: 15px;
        }

        .default-values-info h4 {
            color: #004085;
            margin-bottom: 10px;
            font-size: 14px;
        }

        .default-values-info ul {
            margin-left: 20px;
            color: #004085;
            font-size: 13px;
        }