body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 20px;
    background: #f5f5f5;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.calculator {
    margin: 20px 0;
}

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

input, select, button {
    width: 100%;
    padding: 10px;
    margin: 5px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
}

button {
    background: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #45a049;
}

.results {
    display: none; /* Hidden until calculation */
    margin-top: 20px;
}

#timer {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    margin: 20px 0;
}

.monetization {
    border-top: 1px solid #eee;
    padding-top: 15px;
    margin-top: 20px;
}