:root {
            --btp-color: #0d6efd;
            --etf-color: #fd7e14;
            --break-even-color: #dc3545;
            --bg-light: #f8f9fa;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f5f5f5;
        }
        
        .calculator-card {
            background: white;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            overflow: hidden;
            margin-bottom: 2rem;
        }
        
        .calculator-header {
            background: linear-gradient(135deg, #0d6efd, #0b5ed7);
            color: white;
            padding: 2rem;
            text-align: center;
        }
        
        .calculator-header h1 {
            font-weight: 700;
            margin-bottom: 0.5rem;
            font-size: 2.2rem;
        }
        
        .calculator-header p {
            opacity: 0.9;
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto;
        }
        
        .section-title {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e9ecef;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .section-title i {
            color: #0d6efd;
            font-size: 1.4rem;
        }
        
        .input-group-custom {
            margin-bottom: 1.2rem;
        }
        
        .input-group-custom label {
            font-weight: 500;
            margin-bottom: 0.3rem;
            color: #495057;
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        
        .input-group-custom label i {
            color: #6c757d;
            font-size: 0.9rem;
            cursor: help;
        }
        
        .form-control, .form-select {
            border-radius: 10px;
            border: 1px solid #dee2e6;
            padding: 0.6rem 1rem;
            font-size: 1rem;
            transition: all 0.2s;
        }
        
        .form-control:focus, .form-select:focus {
            border-color: #0d6efd;
            box-shadow: 0 0 0 0.2rem rgba(13,110,253,0.15);
        }
        
        .btn-calculate {
            background: linear-gradient(135deg, #0d6efd, #0b5ed7);
            color: white;
            border: none;
            border-radius: 50px;
            padding: 1rem 2rem;
            font-weight: 600;
            font-size: 1.2rem;
            width: 100%;
            transition: all 0.3s;
            margin: 1.5rem 0;
        }
        
        .btn-calculate:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(13,110,253,0.3);
            background: linear-gradient(135deg, #0b5ed7, #0a58ca);
        }
        
        .result-card {
            background: var(--bg-light);
            border-radius: 15px;
            padding: 1.5rem;
            margin-top: 1rem;
        }
        
        .break-even-box {
            background: linear-gradient(135deg, #0d6efd, #0b5ed7);
            color: white;
            border-radius: 15px;
            padding: 1.5rem;
            text-align: center;
            margin-bottom: 1.5rem;
        }
        
        .break-even-box .label {
            font-size: 1rem;
            opacity: 0.9;
            margin-bottom: 0.5rem;
        }
        
        .break-even-box .value {
            font-size: 3rem;
            font-weight: 700;
            line-height: 1.2;
        }
        
        .break-even-box .subtext {
            font-size: 1rem;
            opacity: 0.9;
            margin-top: 0.5rem;
        }
        
        .metric-card {
            background: white;
            border-radius: 12px;
            padding: 1rem;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            height: 100%;
        }
        
        .metric-card .title {
            font-size: 0.9rem;
            color: #6c757d;
            margin-bottom: 0.3rem;
        }
        
        .metric-card .value {
            font-size: 1.5rem;
            font-weight: 600;
            color: #212529;
        }
        
        .metric-card .unit {
            font-size: 0.9rem;
            color: #6c757d;
            margin-left: 0.2rem;
        }
        
        .metric-card .trend-up {
            color: #198754;
        }
        
        .metric-card .trend-down {
            color: #dc3545;
        }
        
        .comparison-card {
            background: white;
            border-radius: 12px;
            padding: 1.2rem;
            margin-bottom: 1rem;
            border-left: 4px solid transparent;
            transition: all 0.2s;
        }
        
        .comparison-card.btp-wins {
            border-left-color: var(--btp-color);
        }
        
        .comparison-card.etf-wins {
            border-left-color: var(--etf-color);
        }
        
        .etf-preset-btn {
            background-color: white;
            border: 1px solid #dee2e6;
            border-radius: 8px;
            padding: 0.5rem 1rem;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
            font-size: 0.9rem;
            transition: all 0.2s;
        }
        
        .etf-preset-btn:hover {
            background-color: #e9ecef;
            border-color: #0d6efd;
        }
        
        .etf-preset-btn.active {
            background-color: #0d6efd;
            color: white;
            border-color: #0d6efd;
        }
        
        .tooltip-icon {
            color: #6c757d;
            cursor: help;
            font-size: 0.9rem;
            margin-left: 0.3rem;
        }
        
        .chart-container {
            position: relative;
            height: 300px;
            margin: 2rem 0;
        }
        
        .info-box {
            background-color: #e7f3ff;
            border-radius: 12px;
            padding: 1.2rem;
            margin: 1.5rem 0;
            border-left: 4px solid #0d6efd;
        }
        
        .info-box i {
            color: #0d6efd;
            margin-right: 0.5rem;
        }
        
        .disclaimer {
            font-size: 0.85rem;
            color: #6c757d;
            background-color: #f8f9fa;
            border-radius: 10px;
            padding: 1rem;
            margin-top: 2rem;
        }
        
        footer {
            text-align: center;
            padding: 2rem;
            color: #6c757d;
            font-size: 0.9rem;
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .calculator-header h1 {
                font-size: 1.8rem;
            }
            .break-even-box .value {
                font-size: 2.2rem;
            }
        }