.calculator-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

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

button[type="submit"] {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
}

button[type="submit"]:hover {
    background-color: #45a049;
}

#calculator-results {
    margin-top: 20px;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 4px;
}

#macros-chart {
    margin-top: 20px;
    max-width: 400px;
    margin: 20px auto;
}

.error {
    color: red;
    margin-top: 5px;
    font-size: 0.9em;
}