body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f6f6f6;
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
}

h1 {
    margin: 0;
}

main {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.calculator {
    background-color: #fff;
    padding: 40px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

label {
    display: block;
    margin-bottom: 20px;
    font-size: 18px;
    color: #555;
}

input[type="number"] {
    width: 200px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    margin-bottom: 20px;
    font-size: 16px;
    text-align: center;
}

button {
    background-color: #333;
    color: #fff;
    border: none;
    padding: 12px 20px;
    font-size: 16px;
    cursor: pointer;
    margin: 10px;
}

hr {
    border: none;
    border-top: 1px solid #ccc;
    margin: 20px 0;
}

.result {
    font-weight: bold;
    font-size: 18px;
    margin-top: 20px;
}

.breakdown {
    display: none;
    margin-top: 20px;
    font-size: 16px;
    color: #888;
}