.csn-calculator {
    max-width: 480px;
    margin: 20px auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    font-family: Arial, sans-serif;
    border: 1px solid #ccc;
}

.csn-calculator h2 {
    text-align: center;
    color: #235cfb;
    margin-bottom: 20px;
}

.csn-calculator label {
    display: block;
    margin-top: 15px;
    font-weight: bold;
}

.csn-calculator input,
.csn-calculator select {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    box-sizing: border-box;
}

.csn-calculator button {
    margin-top: 20px;
    width: 100%;
    background-color: #235cfb;
    border: none;
    padding: 12px;
    color: white;
    font-weight: bold;
    border-radius: 6px;
    cursor: pointer;
}

.csn-calculator button:hover {
    background-color: #25e49c;
}

#csn-result {
    margin-top: 25px;
    background: #f9f9f9;
    padding: 15px;
    border-radius: 6px;
}

#csn-result h3 {
    margin-bottom: 10px;
    color: #235cfb;
}