* {
            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: 800px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }

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

        .header h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            font-weight: 300;
        }

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

        .content {
            padding: 40px;
        }

        .upload-area {
            border: 3px dashed #667eea;
            border-radius: 15px;
            padding: 40px;
            text-align: center;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
            transition: all 0.3s ease;
            cursor: pointer;
            margin-bottom: 30px;
        }

        .upload-area:hover {
            border-color: #764ba2;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
            transform: translateY(-2px);
        }

        .upload-area.dragover {
            border-color: #764ba2;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(118, 75, 162, 0.15) 100%);
        }

        .upload-icon {
            font-size: 3rem;
            color: #667eea;
            margin-bottom: 20px;
        }

        .upload-text {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: #333;
        }

        .upload-hint {
            color: #666;
            font-size: 0.9rem;
        }

        #fileInput {
            display: none;
        }

        .btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 25px;
            cursor: pointer;
            font-size: 1rem;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .file-info {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 20px;
            margin: 20px 0;
            border-left: 4px solid #667eea;
        }

        .status {
            padding: 15px;
            border-radius: 10px;
            margin: 20px 0;
            font-weight: 500;
        }

        .status.success {
            background: #d4edda;
            color: #155724;
            border: 1px solid #c3e6cb;
        }

        .status.error {
            background: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }

        .status.processing {
            background: #fff3cd;
            color: #856404;
            border: 1px solid #ffeeba;
        }

        .output-area {
            background: #f8f9fa;
            border: 1px solid #e9ecef;
            border-radius: 10px;
            padding: 20px;
            margin-top: 20px;
        }

        .output-area h3 {
            margin-bottom: 15px;
            color: #333;
        }

        .json-preview {
            background: #2d3748;
            color: #e2e8f0;
            padding: 20px;
            border-radius: 8px;
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
            max-height: 400px;
            overflow-y: auto;
            white-space: pre-wrap;
            word-break: break-all;
        }

        .download-btn {
            margin-top: 15px;
            background: #28a745;
        }

        .download-btn:hover {
            background: #218838;
        }

        .spinner {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255,255,255,.3);
            border-radius: 50%;
            border-top-color: #fff;
            animation: spin 1s ease-in-out infinite;
            margin-right: 10px;
        }

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

        @media (max-width: 600px) {
            .container {
                margin: 10px;
            }
            
            .header h1 {
                font-size: 2rem;
            }
            
            .content {
                padding: 20px;
            }
        }