.swp-calculator-wrapper {
    background-color: #f0f2f5; /* Classic light gray */
    color: #333; /* Classic dark gray */
    line-height: 1.6;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

.calculator {
    background: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    max-width: 100%;
    width: 500px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 15px;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
}

.result {
    margin-top: 20px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    background: #f9f9f9;
}

footer {
    text-align: center;
    margin-top: 20px;
}

footer a {
    color: #2c3e50;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}