* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        :root {
            --primary-blue: #2c5aa0;
            --primary-red: #d93025;
            --primary-green: #0d9d58;
            --gradient-primary: linear-gradient(135deg, #2c5aa0 0%, #4285f4 100%);
            --gradient-secondary: linear-gradient(135deg, #d93025 0%, #ea4335 100%);
            --gradient-success: linear-gradient(135deg, #0d9d58 0%, #34a853 100%);
            --dark-bg: #1a1a2e;
            --card-bg: #ffffff;
            --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            --card-border-radius: 16px;
            --text-primary: #333333;
            --text-secondary: #666666;
            --border-color: #e0e0e0;
        }

        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            color: var(--text-primary);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
        }

        /* Header */
        .header {
            text-align: center;
            margin-bottom: 40px;
            padding: 30px 0;
            position: relative;
        }

        .header::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 150px;
            height: 4px;
            background: var(--gradient-primary);
            border-radius: 2px;
        }

        .logo {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            margin-bottom: 20px;
        }

        .logo-icon {
            background: var(--gradient-primary);
            width: 70px;
            height: 70px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            color: white;
            box-shadow: 0 8px 20px rgba(44, 90, 160, 0.3);
        }

        .logo-text h1 {
            font-size: 42px;
            font-weight: 800;
            background: linear-gradient(135deg, #2c5aa0, #4285f4);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            line-height: 1.2;
        }

        .logo-text p {
            color: var(--text-secondary);
            font-size: 18px;
        }

        .premium-badge {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, #ffd700, #ffa500);
            color: #000;
            padding: 10px 25px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 16px;
            margin-top: 15px;
            box-shadow: 0 5px 15px rgba(255, 165, 0, 0.3);
        }

        /* Main Content */
        .main-content {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
            margin-bottom: 40px;
        }

        @media (min-width: 1200px) {
            .main-content {
                grid-template-columns: 1fr 1fr;
            }
        }

        /* Cards */
        .card {
            background: var(--card-bg);
            border-radius: var(--card-border-radius);
            padding: 35px;
            box-shadow: var(--card-shadow);
            border: 1px solid var(--border-color);
            transition: transform 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
        }

        .card-header {
            display: flex;
            align-items: center;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 2px solid #f0f0f0;
        }

        .card-header i {
            font-size: 28px;
            margin-right: 15px;
            color: var(--primary-blue);
            background: rgba(44, 90, 160, 0.1);
            width: 60px;
            height: 60px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .card-header h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
        }

        /* Upload Area */
        .upload-area {
            border: 3px dashed var(--border-color);
            border-radius: 16px;
            padding: 60px 30px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            background: #fafafa;
            margin-bottom: 25px;
        }

        .upload-area:hover, .upload-area.dragover {
            border-color: var(--primary-blue);
            background: rgba(44, 90, 160, 0.05);
        }

        .upload-icon {
            font-size: 64px;
            color: var(--primary-blue);
            margin-bottom: 20px;
        }

        .upload-text h3 {
            font-size: 24px;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .upload-text p {
            color: var(--text-secondary);
            margin-bottom: 20px;
        }

        .browse-btn {
            display: inline-block;
            background: var(--gradient-primary);
            color: white;
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }

        .browse-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(44, 90, 160, 0.3);
        }

        #file-input {
            display: none;
        }

        /* File Preview */
        .file-preview {
            background: #f8f9ff;
            border-radius: 12px;
            padding: 20px;
            margin-top: 20px;
            display: none;
        }

        .file-info {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .file-icon {
            font-size: 40px;
            color: var(--primary-red);
        }

        .file-details h4 {
            font-size: 18px;
            margin-bottom: 5px;
        }

        .file-details p {
            color: var(--text-secondary);
            font-size: 14px;
        }

        .file-actions {
            margin-left: auto;
            display: flex;
            gap: 10px;
        }

        .file-action-btn {
            background: none;
            border: none;
            font-size: 20px;
            cursor: pointer;
            color: var(--text-secondary);
            transition: color 0.3s;
        }

        .file-action-btn:hover {
            color: var(--primary-red);
        }

        /* Settings */
        .settings-group {
            margin-bottom: 25px;
        }

        .settings-group label {
            display: block;
            margin-bottom: 12px;
            font-weight: 600;
            color: var(--text-primary);
            font-size: 17px;
        }

        .settings-options {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
        }

        .option-item {
            background: #f8f9ff;
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
            border: 2px solid transparent;
        }

        .option-item:hover {
            background: #eef1ff;
            transform: translateY(-3px);
        }

        .option-item.active {
            background: #e3e9ff;
            border-color: var(--primary-blue);
        }

        .option-icon {
            font-size: 28px;
            color: var(--primary-blue);
            margin-bottom: 12px;
        }

        .option-title {
            font-weight: 600;
            margin-bottom: 8px;
        }

        .option-desc {
            font-size: 14px;
            color: var(--text-secondary);
        }

        .checkbox-group {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
        }

        .checkbox-item {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .checkbox-item input[type="checkbox"] {
            width: 20px;
            height: 20px;
            accent-color: var(--primary-blue);
        }

        /* Buttons */
        .action-buttons {
            display: flex;
            gap: 15px;
            margin-top: 30px;
        }

        .btn {
            flex: 1;
            padding: 18px;
            border: none;
            border-radius: 12px;
            font-size: 17px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
        }

        .btn-primary {
            background: var(--gradient-primary);
            color: white;
        }

        .btn-primary:hover:not(:disabled) {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(44, 90, 160, 0.3);
        }

        .btn-secondary {
            background: #f0f2f5;
            color: var(--text-primary);
        }

        .btn-secondary:hover {
            background: #e4e6e9;
            transform: translateY(-3px);
        }

        .btn-success {
            background: var(--gradient-success);
            color: white;
        }

        .btn-success:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(13, 157, 88, 0.3);
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none !important;
            box-shadow: none !important;
        }

        /* Progress Bar */
        .progress-container {
            margin-top: 25px;
            display: none;
        }

        .progress-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
        }

        .progress-bar {
            height: 10px;
            background: #e0e0e0;
            border-radius: 5px;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: var(--gradient-primary);
            width: 0%;
            transition: width 0.5s ease;
            border-radius: 5px;
        }

        /* Results */
        .result-section {
            margin-top: 40px;
            display: none;
        }

        .result-card {
            background: linear-gradient(135deg, #f8f9ff, #ffffff);
            border-radius: 16px;
            padding: 30px;
            border: 2px solid #e3e9ff;
        }

        .result-header {
            display: flex;
            align-items: center;
            margin-bottom: 25px;
        }

        .result-icon {
            font-size: 40px;
            color: var(--primary-green);
            margin-right: 20px;
        }

        .result-info h3 {
            font-size: 24px;
            color: var(--text-primary);
            margin-bottom: 5px;
        }

        .result-info p {
            color: var(--text-secondary);
        }

        .result-preview {
            background: white;
            border-radius: 12px;
            padding: 25px;
            margin-bottom: 25px;
            border: 1px solid var(--border-color);
            max-height: 300px;
            overflow-y: auto;
        }

        .preview-content {
            font-family: 'Courier New', monospace;
            line-height: 1.6;
            white-space: pre-wrap;
        }

        .result-actions {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }

        /* Features */
        .features-section {
            margin-top: 60px;
        }

        .features-title {
            text-align: center;
            font-size: 32px;
            margin-bottom: 40px;
            color: var(--text-primary);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
        }

        .feature-card {
            background: white;
            border-radius: 16px;
            padding: 30px;
            text-align: center;
            box-shadow: var(--card-shadow);
            transition: all 0.3s;
        }

        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
        }

        .feature-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, rgba(44, 90, 160, 0.1), rgba(66, 133, 244, 0.1));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 32px;
            color: var(--primary-blue);
        }

        .feature-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 15px;
            color: var(--text-primary);
        }

        .feature-desc {
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Footer */
        .footer {
            text-align: center;
            margin-top: 60px;
            padding-top: 30px;
            border-top: 1px solid var(--border-color);
            color: var(--text-secondary);
            font-size: 15px;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 25px;
            margin-top: 20px;
        }

        .footer-links a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: var(--primary-red);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .logo {
                flex-direction: column;
                text-align: center;
            }
            
            .logo-text h1 {
                font-size: 32px;
            }
            
            .card {
                padding: 25px;
            }
            
            .action-buttons {
                flex-direction: column;
            }
            
            .settings-options {
                grid-template-columns: 1fr;
            }
            
            .result-actions {
                flex-direction: column;
            }
        }

        /* Loading Animation */
        .loading {
            display: none;
            text-align: center;
            padding: 40px;
        }

        .loading-spinner {
            width: 60px;
            height: 60px;
            border: 5px solid #f3f3f3;
            border-top: 5px solid var(--primary-blue);
            border-radius: 50%;
            margin: 0 auto 20px;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Status Messages */
        .status-message {
            padding: 15px;
            border-radius: 10px;
            margin-top: 20px;
            display: none;
        }

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

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

        /* File Size Warning */
        .file-size-warning {
            background: #fff3cd;
            color: #856404;
            padding: 15px;
            border-radius: 10px;
            margin-top: 20px;
            display: none;
            border: 1px solid #ffeaa7;
        }