body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1, h2 {
    text-align: center;
    color: #333;
}

.variables-list {
    margin-top: 20px;
}

.variables-list table {
    width: 100%;
    border-collapse: collapse;
}

.variables-list th, .variables-list td {
    padding: 10px;
    text-align: left;
    border: 1px solid #ddd;
}

.variables-list th {
    background-color: #e9ecef;
    color: #333;
}

.variables-list tr:nth-child(even) {
    background-color: #f9f9f9;
}

.variables-list tr:nth-child(odd) {
    background-color: #f2f2f2;
}

.variables-list th:nth-child(2), .variables-list td:nth-child(2) {
    width: 150px;
    text-align: center;
}

.variables-list th:nth-child(3), .variables-list td:nth-child(3) {
    width: 100px;
    text-align: right;
}

.form-group {
    margin: 15px 0;
}

label {
    display: block;
    margin-bottom: 5px;
}

input, select, button {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 10px;
}

button {
    background-color: #007bff;
    color: #fff;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

#results {
    margin-top: 20px;
}