:root {
            --primary-color: #4361ee;
            --secondary-color: #3f37c9;
            --accent-color: #4895ef;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --success-color: #4cc9f0;
            --border-radius: 12px;
            --box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        body {
            font-family: 'Vazir', Arial, sans-serif;
            background-color: #f5f7ff;
            color: var(--dark-color);
            line-height: 1.6;
        }
        
        .container {
            max-width: 800px;
            margin: 2rem auto;
            padding: 0 1rem;
        }
        
        .calculator-card {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            transition: var(--transition);
        }
        
        .calculator-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 1.5rem;
            text-align: center;
            position: relative;
        }
        
        .calculator-header h1 {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
        }
        
        .calculator-header p {
            opacity: 0.9;
            font-size: 0.9rem;
        }
        
        .calculator-body {
            padding: 1.5rem;
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: var(--dark-color);
        }
        
        .select-wrapper, .input-wrapper {
            position: relative;
        }
        
        select, input {
            width: 100%;
            padding: 1rem;
            border: 1px solid #e0e0e0;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
            appearance: none;
            background-color: var(--light-color);
        }
        
        select:focus, input:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }
        
        .select-wrapper::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            top: 50%;
            left: 1rem;
            transform: translateY(-50%);
            color: var(--dark-color);
            pointer-events: none;
        }
        
        .input-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--dark-color);
        }
        
        input {
            padding-left: 3rem;
        }
        
        .result-card {
            background: linear-gradient(135deg, #f0f9ff, #e6f4ff);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            margin-top: 1.5rem;
            border-left: 4px solid var(--primary-color);
            display: none;
        }
        
        .result-card.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }
        
        .result-title {
            color: var(--primary-color);
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .result-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--secondary-color);
            margin: 0.5rem 0;
        }
        
        .result-details {
            color: #555;
            font-size: 0.9rem;
        }
        
        .table-responsive {
            overflow-x: auto;
            margin: 2rem 0;
        }
        
        table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }
        
        th, td {
            padding: 1rem;
            text-align: center;
            border: 1px solid #f0f0f0;
        }
        
        th {
            background-color: var(--primary-color);
            color: white;
            font-weight: 500;
        }
        
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        
        .note {
            background-color: #fff8e1;
            border-left: 4px solid #ffc107;
            padding: 1rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin-top: 1.5rem;
            font-size: 0.9rem;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        /* Responsive Styles */
        @media (max-width: 768px) {
            .container {
                padding: 0 0.75rem;
            }
            
            .calculator-header h1 {
                font-size: 1.3rem;
            }
            
            select, input {
                padding: 0.8rem;
            }
            
            th, td {
                padding: 0.75rem;
                font-size: 0.9rem;
            }
        }
        
        @media (max-width: 480px) {
            .calculator-header {
                padding: 1rem;
            }
            
            .calculator-body {
                padding: 1rem;
            }
            
            .result-value {
                font-size: 1.3rem;
            }
            
            th, td {
                padding: 0.5rem;
                font-size: 0.8rem;
            }
        }