.mbn-wrapper {
    max-width: 1100px;
    margin: 0 auto;
    background: #ffffff;
    border-radius: 6px;
    padding: 20px;
    box-shadow: 0 3px 8px rgba(0,0,0,0.1);
    font-family: Arial, sans-serif;
    color: #333;
}

.mbn-wrapper h2 {
    margin-top: 0;
    text-align: center;
    font-weight: bold;
    color: #1a1a1a;
}

.mbn-flex-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.mbn-col-left {
    flex: 1 1 350px;
    min-width: 300px;
}

.mbn-form {
    background: #f9f9f9;
    padding: 15px;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.mbn-field-group {
    margin-bottom: 15px;
}

.mbn-field-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

.mbn-field-group input {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 0.95rem;
    box-sizing: border-box;
}

#mbnCalculateBtn {
    background: #0069d9;
    color: #fff;
    padding: 12px 18px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}

#mbnCalculateBtn:hover {
    background: #0053aa;
}

.mbn-advanced-btn {
    background: #34495e;
    color: #fff;
    padding: 8px 14px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

.mbn-advanced-btn:hover {
    background: #2c3e50;
}

.mbn-col-right {
    flex: 1 1 400px;
    min-width: 350px;
}

.mbn-results {
    background: #fafafa;
    padding: 20px;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.mbn-results-title {
    margin-top: 0;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 15px;
}

.mbn-cost-line {
    margin: 6px 0;
    font-size: 1rem;
}

.mbn-cost-total {
    margin: 12px 0;
    font-size: 1.1rem;
    font-weight: bold;
    color: #333;
}

.mbn-chart-wrapper {
    margin-top: 20px;
    text-align: center;
}

#mbnPieChart {
    max-width: 300px;
    margin: 0 auto;
}

/* Responsive table container for horizontal scrolling */
.mbn-table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

#mbnAmortizationTable {
    width: 100%;
    border-collapse: collapse;
    min-width: 700px;
}

#mbnAmortizationTable th {
    background: #e6e6e6;
    padding: 8px;
    text-align: center;
    border: 1px solid #ccc;
    font-weight: 600;
}

#mbnAmortizationTable td {
    text-align: right;
    border: 1px solid #ccc;
    padding: 5px;
}

.mbn-amort-btn {
    background: #7f8c8d;
    color: #fff;
    padding: 10px 14px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

.mbn-amort-btn:hover {
    background: #555a5a;
}

/* Responsive: stack columns on narrow screens */
@media (max-width: 768px) {
    .mbn-flex-container {
        flex-direction: column;
    }
    .mbn-col-left,
    .mbn-col-right {
        min-width: auto;
        width: 100%;
    }
}