:root {
            --primary: #4f46e5;
            --primary-dark: #4338ca;
            --secondary: #10b981;
            --secondary-dark: #0da271;
            --dark: #1e293b;
            --light: #f8fafc;
            --gray: #64748b;
            --gray-light: #e2e8f0;
            --premium-gold: #f59e0b;
            --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --radius: 12px;
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

        body {
            background-color: #f1f5f9;
            color: var(--dark);
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        /* Header & Premium Badge */
        header {
            text-align: center;
            margin-bottom: 40px;
            position: relative;
        }

        .logo {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
            margin-bottom: 10px;
        }

        .logo i {
            font-size: 2.8rem;
            color: var(--primary);
        }

        .logo-text {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .premium-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, #fbbf24, #f59e0b);
            color: #78350f;
            padding: 8px 20px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.9rem;
            margin-top: 10px;
            box-shadow: 0 4px 10px rgba(245, 158, 11, 0.3);
        }

        .tagline {
            color: var(--gray);
            font-size: 1.1rem;
            margin-top: 10px;
        }

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

        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }

        /* Calculator Card */
        .calculator-card, .results-card, .ai-insights-card, .comparison-card {
            background: white;
            border-radius: var(--radius);
            padding: 30px;
            box-shadow: var(--shadow);
        }

        .card-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 2px solid var(--gray-light);
        }

        .card-header i {
            font-size: 1.8rem;
            color: var(--primary);
        }

        .card-title {
            font-size: 1.5rem;
            font-weight: 700;
        }

        /* Input Section */
        .input-group {
            margin-bottom: 25px;
        }

        .input-label {
            display: flex;
            justify-content: space-between;
            margin-bottom: 8px;
        }

        .input-label span {
            font-weight: 600;
            color: var(--dark);
        }

        .value-display {
            font-weight: 700;
            color: var(--primary);
        }

        .slider-container {
            position: relative;
            height: 40px;
            display: flex;
            align-items: center;
        }

        .slider {
            width: 100%;
            height: 8px;
            -webkit-appearance: none;
            appearance: none;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            border-radius: 4px;
            outline: none;
        }

        .slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary-dark);
            cursor: pointer;
            border: 3px solid white;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
        }

        .input-with-icon {
            position: relative;
        }

        .input-with-icon i {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray);
        }

        .input-with-icon input {
            width: 100%;
            padding: 14px 14px 14px 45px;
            border: 2px solid var(--gray-light);
            border-radius: var(--radius);
            font-size: 1rem;
            font-weight: 600;
            transition: var(--transition);
        }

        .input-with-icon input:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
        }

        /* Button */
        .calculate-btn {
            width: 100%;
            padding: 18px;
            background: linear-gradient(to right, var(--primary), var(--primary-dark));
            color: white;
            border: none;
            border-radius: var(--radius);
            font-size: 1.1rem;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            margin-top: 10px;
        }

        .calculate-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(79, 70, 229, 0.2);
        }

        .calculate-btn:active {
            transform: translateY(0);
        }

        /* Results Card */
        .results-card {
            background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
            color: white;
        }

        .results-card .card-header {
            border-bottom-color: rgba(255, 255, 255, 0.2);
        }

        .results-card .card-header i {
            color: white;
        }

        .results-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 25px;
        }

        .result-item {
            background: rgba(255, 255, 255, 0.1);
            padding: 20px;
            border-radius: var(--radius);
            text-align: center;
            backdrop-filter: blur(10px);
        }

        .result-value {
            font-size: 2rem;
            font-weight: 800;
            margin: 10px 0;
        }

        .result-label {
            font-size: 0.9rem;
            opacity: 0.9;
        }

        .chart-container {
            height: 200px;
            margin-top: 20px;
            position: relative;
        }

        .chart {
            display: flex;
            align-items: flex-end;
            height: 100%;
            gap: 4px;
        }

        .chart-bar {
            flex: 1;
            background: rgba(255, 255, 255, 0.7);
            border-radius: 4px 4px 0 0;
            transition: var(--transition);
            position: relative;
        }

        .chart-bar.invested {
            background: rgba(255, 255, 255, 0.5);
        }

        .chart-bar.returns {
            background: var(--secondary);
        }

        /* AI Insights */
        .ai-insights-card {
            position: relative;
            overflow: hidden;
        }

        .ai-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--secondary);
            color: white;
            padding: 6px 15px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .insight-item {
            display: flex;
            align-items: flex-start;
            gap: 15px;
            margin-bottom: 25px;
            padding-bottom: 25px;
            border-bottom: 1px solid var(--gray-light);
        }

        .insight-item:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }

        .insight-icon {
            background: var(--gray-light);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .insight-icon i {
            font-size: 1.5rem;
            color: var(--primary);
        }

        .insight-content h4 {
            font-size: 1.1rem;
            margin-bottom: 5px;
        }

        .insight-content p {
            color: var(--gray);
        }

        /* Comparison Card */
        .comparison-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            border-bottom: 1px solid var(--gray-light);
        }

        .comparison-label {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .comparison-value {
            font-weight: 700;
            font-size: 1.1rem;
        }

        .comparison-value.better {
            color: var(--secondary);
        }

        .comparison-value.worse {
            color: #ef4444;
        }

        /* Footer */
        footer {
            text-align: center;
            padding: 30px 0;
            color: var(--gray);
            font-size: 0.9rem;
            border-top: 1px solid var(--gray-light);
            margin-top: 40px;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 25px;
            margin-top: 15px;
        }

        .footer-links a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
        }

        .footer-links a:hover {
            text-decoration: underline;
        }

        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .container {
                padding: 15px;
            }
            
            .logo-text {
                font-size: 2rem;
            }
            
            .calculator-card, .results-card, .ai-insights-card, .comparison-card {
                padding: 20px;
            }
            
            .results-grid {
                grid-template-columns: 1fr;
                gap: 15px;
            }
            
            .result-value {
                font-size: 1.7rem;
            }
        }

        @media (max-width: 480px) {
            .logo {
                flex-direction: column;
                gap: 5px;
            }
            
            .main-content {
                gap: 20px;
            }
            
            .card-header {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
            
            .footer-links {
                flex-direction: column;
                gap: 10px;
            }
        }