:root {
            --primary: #07859b;
            --primary-light: #0aa5c0;
            --primary-dark: #02404b;
            --accent: #f8be2e;
            --accent-dark: #e6a80c;
            --premium: #9c27b0;
            --premium-light: #ba68c8;
            --danger: #f44336;
            --success: #4caf50;
            --light: #ffffff;
            --gray: #f5f7fa;
            --gray-dark: #e0e0e0;
            --dark: #333333;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
            --radius: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s ease;
        }

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

        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            color: var(--dark);
            min-height: 100vh;
            padding: 15px;
            display: flex;
            justify-content: center;
            align-items: flex-start;
        }

        .container {
            max-width: 1400px;
            width: 100%;
            background: var(--light);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            overflow: hidden;
            margin: auto;
        }

        /* Header */
        .tool-header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: var(--light);
            padding: 25px 30px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .tool-header::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 100%;
            height: 100%;
            background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
            transform: rotate(45deg);
        }

        .header-content {
            position: relative;
            z-index: 2;
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
        }

        .ai-badge {
            background: var(--accent);
            color: var(--dark);
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .subtitle {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 800px;
            margin: 0 auto;
        }

        /* Premium Banner */
        .premium-banner {
            background: linear-gradient(135deg, var(--premium) 0%, #7b1fa2 100%);
            color: white;
            padding: 15px 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
        }

        .premium-features {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .premium-feature {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
        }

        .premium-btn {
            background: var(--accent);
            color: var(--dark);
            padding: 10px 25px;
            border-radius: var(--radius);
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .premium-btn:hover {
            background: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }

        /* Main Content Layout */
        .main-content {
            display: grid;
            grid-template-columns: 1fr 400px;
            gap: 30px;
            padding: 30px;
        }

        @media (max-width: 1024px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }

        /* Left Panel - Text Input */
        .input-section {
            background: var(--light);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 25px;
        }

        .text-input-container {
            position: relative;
            margin-bottom: 20px;
        }

        .text-input {
            width: 100%;
            min-height: 250px;
            padding: 20px;
            border: 2px solid var(--gray-dark);
            border-radius: var(--radius);
            font-size: 16px;
            resize: vertical;
            transition: var(--transition);
            line-height: 1.6;
            background: var(--gray);
        }

        .text-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(7, 133, 155, 0.2);
            background: white;
        }

        .char-count-indicator {
            position: absolute;
            bottom: 10px;
            right: 10px;
            background: rgba(0,0,0,0.7);
            color: white;
            padding: 5px 10px;
            border-radius: var(--radius);
            font-size: 0.8rem;
        }

        .text-controls {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 25px;
        }

        .control-btn {
            padding: 10px 20px;
            border: 2px solid var(--primary);
            background: transparent;
            color: var(--primary);
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }

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

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

        /* Progress Bars */
        .progress-section {
            background: var(--gray);
            border-radius: var(--radius);
            padding: 20px;
            margin-top: 20px;
        }

        .progress-item {
            margin-bottom: 15px;
        }

        .progress-label {
            display: flex;
            justify-content: space-between;
            margin-bottom: 5px;
            font-size: 0.9rem;
            color: var(--dark);
        }

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

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

        /* Right Panel - Stats & AI */
        .right-panel {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }

        /* Quick Stats */
        .quick-stats {
            background: var(--light);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 25px;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            margin-bottom: 20px;
        }

        .stat-card {
            background: var(--gray);
            border-radius: var(--radius);
            padding: 20px;
            text-align: center;
            transition: var(--transition);
            border-top: 4px solid var(--primary);
        }

        .stat-card.premium {
            border-color: var(--premium);
            position: relative;
            overflow: hidden;
        }

        .premium-tag {
            position: absolute;
            top: 10px;
            right: 10px;
            background: var(--premium);
            color: white;
            padding: 3px 8px;
            border-radius: 10px;
            font-size: 0.7rem;
            font-weight: 600;
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }

        .stat-value {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 5px;
            color: var(--primary);
        }

        .stat-card.premium .stat-value {
            color: var(--premium);
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--dark);
            opacity: 0.7;
        }

        /* AI Insights */
        .ai-insights {
            background: var(--light);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 25px;
        }

        .ai-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .ai-title {
            font-size: 1.3rem;
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .insights-container {
            background: var(--gray);
            border-radius: var(--radius);
            padding: 20px;
            min-height: 200px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .insight-placeholder {
            text-align: center;
            color: var(--dark);
            opacity: 0.5;
        }

        .insight-content {
            display: none;
        }

        .insight-item {
            background: white;
            border-radius: var(--radius);
            padding: 15px;
            margin-bottom: 10px;
            border-left: 4px solid var(--accent);
        }

        .insight-item.warning {
            border-left-color: var(--danger);
        }

        .insight-item.success {
            border-left-color: var(--success);
        }

        .insight-title {
            font-weight: 600;
            margin-bottom: 5px;
            color: var(--dark);
        }

        .insight-text {
            font-size: 0.9rem;
            color: #666;
            line-height: 1.5;
        }

        /* Export Section */
        .export-section {
            background: var(--light);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 25px;
        }

        .export-options {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 15px;
        }

        .export-btn {
            padding: 10px 20px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }

        .export-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }

        .export-btn.premium {
            background: var(--premium);
            position: relative;
            overflow: hidden;
        }

        .export-btn.premium::after {
            content: 'PREMIUM';
            position: absolute;
            top: -8px;
            right: -25px;
            background: var(--accent);
            color: var(--dark);
            padding: 2px 25px;
            transform: rotate(45deg);
            font-size: 0.7rem;
            font-weight: 600;
        }

        /* Footer */
        .tool-footer {
            text-align: center;
            padding: 20px;
            background: var(--gray);
            color: var(--dark);
            font-size: 0.9rem;
            border-top: 1px solid var(--gray-dark);
        }

        /* Premium Modal */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            display: none;
            justify-content: center;
            align-items: center;
            z-index: 1000;
            padding: 20px;
        }

        .modal-content {
            background: white;
            border-radius: var(--radius-lg);
            padding: 40px;
            max-width: 500px;
            width: 100%;
            max-height: 90vh;
            overflow-y: auto;
            position: relative;
        }

        .modal-close {
            position: absolute;
            top: 15px;
            right: 15px;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--dark);
        }

        .modal-title {
            font-size: 1.8rem;
            color: var(--premium);
            margin-bottom: 20px;
            text-align: center;
        }

        .feature-list {
            list-style: none;
            margin: 25px 0;
        }

        .feature-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--gray);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .feature-list li:last-child {
            border-bottom: none;
        }

        .pricing-options {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            margin: 25px 0;
        }

        .pricing-option {
            background: var(--gray);
            border: 2px solid transparent;
            border-radius: var(--radius);
            padding: 20px;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
        }

        .pricing-option:hover {
            border-color: var(--premium);
        }

        .pricing-option.selected {
            border-color: var(--premium);
            background: rgba(156, 39, 176, 0.1);
        }

        .plan-name {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 5px;
        }

        .plan-price {
            font-size: 2rem;
            font-weight: 700;
            color: var(--premium);
            margin-bottom: 10px;
        }

        .plan-duration {
            color: #666;
            font-size: 0.9rem;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .main-content {
                padding: 20px;
                gap: 20px;
            }
            
            .tool-header {
                padding: 20px;
            }
            
            h1 {
                font-size: 1.8rem;
                flex-direction: column;
                gap: 10px;
            }
            
            .premium-banner {
                padding: 15px 20px;
                flex-direction: column;
                text-align: center;
            }
            
            .premium-features {
                justify-content: center;
            }
            
            .stats-grid {
                grid-template-columns: 1fr;
            }
            
            .text-controls {
                justify-content: center;
            }
            
            .export-options {
                flex-direction: column;
            }
        }

        @media (max-width: 480px) {
            .container {
                border-radius: 10px;
            }
            
            .tool-header {
                padding: 15px;
            }
            
            .main-content {
                padding: 15px;
            }
            
            .input-section, .quick-stats, .ai-insights, .export-section {
                padding: 20px;
            }
            
            .pricing-options {
                grid-template-columns: 1fr;
            }
        }

        /* Loading Animation */
        .loader {
            display: none;
            width: 40px;
            height: 40px;
            border: 4px solid var(--gray);
            border-top: 4px solid var(--primary);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 20px auto;
        }

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

        /* Tooltip */
        .tooltip {
            position: relative;
            display: inline-block;
        }

        .tooltip .tooltip-text {
            visibility: hidden;
            width: 200px;
            background-color: var(--dark);
            color: white;
            text-align: center;
            border-radius: var(--radius);
            padding: 10px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            transform: translateX(-50%);
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.8rem;
        }

        .tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }