.bnr-calculator-container {
    max-width: 560px;
    margin: 20px auto;
    font-family: sans-serif;
}
.bnr-calculator-container p {
    text-align: center;
}
.calculator-box {
    padding: 16px;
    border: 1px solid #eee;
    border-radius: 12px;
    background: #fafafa;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}
.calculator-box h3 {
    text-align: center;
    margin: 0 0 16px 0;
}
.calculator-flex {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: flex-end;
    justify-content: center;
}
.calculator-flex div {
    text-align: center;
}
.calculator-flex input,
.calculator-flex select {
    padding: 8px;
    border-radius: 8px;
    border: 1px solid #ccc;
    width: 120px;
}
.calculator-flex button {
    padding: 6px 10px;
    border: none;
    border-radius: 50%;
    background: #eee;
    cursor: pointer;
}
.calculator-flex button:last-child {
    border-radius: 10px;
    background: #1e88e5;
    color: #fff;
    padding: 10px 16px;
}
#bnr_result {
    margin-top: 16px;
    text-align: center;
    font-weight: 600;
    color: #2b2b2b;
}