.container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
            color: white;
            padding: 30px;
            text-align: center;
        }

        .header h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            font-weight: 300;
        }

        .header p {
            font-size: 1.1rem;
            opacity: 0.9;
        }

        .main-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0;
            min-height: 600px;
        }

        .input-section {
            padding: 40px;
            background: #f8f9fa;
            border-right: 1px solid #e9ecef;
        }

        .results-section {
            padding: 40px;
            background: white;
        }

        .form-group {
            margin-bottom: 25px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
            font-size: 0.95rem;
        }

        .form-group input, .form-group select {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid #e1e8ed;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background: white;
        }

        .form-group input:focus, .form-group select:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
        }

        .calculate-btn {
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 10px;
        }

        .calculate-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
        }

        .results-container {
            background: #f8f9fa;
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 30px;
        }

        .result-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            border-bottom: 1px solid #e9ecef;
        }

        .result-item:last-child {
            border-bottom: none;
        }

        .result-label {
            font-weight: 600;
            color: #2c3e50;
        }

        .result-value {
            font-size: 1.2rem;
            font-weight: 700;
            color: #27ae60;
        }

        .result-value.highlight {
            color: #e74c3c;
            font-size: 1.4rem;
        }

        .payment-schedule {
            background: white;
            border-radius: 15px;
            border: 1px solid #e9ecef;
            overflow: hidden;
        }

        .schedule-header {
            background: #2c3e50;
            color: white;
            padding: 20px;
            text-align: center;
        }

        .schedule-table {
            max-height: 300px;
            overflow-y: auto;
        }

        .schedule-table table {
            width: 100%;
            border-collapse: collapse;
        }

        .schedule-table th {
            background: #34495e;
            color: white;
            padding: 12px 8px;
            font-weight: 600;
            font-size: 0.9rem;
            text-align: center;
            position: sticky;
            top: 0;
        }

        .schedule-table td {
            padding: 10px 8px;
            text-align: center;
            border-bottom: 1px solid #f1f2f6;
            font-size: 0.85rem;
        }

        .schedule-table tr:hover {
            background: #f8f9fa;
        }

        .footer {
            background: #2c3e50;
            color: white;
            text-align: center;
            padding: 20px;
            font-size: 0.9rem;
            opacity: 0.8;
        }

        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            
            .input-section {
                border-right: none;
                border-bottom: 1px solid #e9ecef;
            }
            
            .header h1 {
                font-size: 2rem;
            }
            
            .input-section, .results-section {
                padding: 25px;
            }
        }

        .error-message {
            color: #e74c3c;
            font-size: 0.85rem;
            margin-top: 5px;
            display: none;
        }

        .input-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        @media (max-width: 480px) {
            .input-row {
                grid-template-columns: 1fr;
                gap: 0;
            }
        }