body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: #f0f0f0;
}

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

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

.notice {
    background-color: #fff3cd;
    padding: 10px;
    margin-bottom: 20px;
    border-radius: 4px;
    border: 1px solid #ffeeba;
}

.calculator {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

label {
    flex: 1;
    margin-right: 10px;
}

input, select {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
    font-size: 14px;
}

select {
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 1em;
    padding-right: 8px;
}

select::-ms-expand {
    display: none;
}

button {
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    margin: 10px 0;
}

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

.result {
    margin-top: 20px;
    padding: 15px;
    background-color: #e9ecef;
    border-radius: 4px;
    text-align: center;
    font-weight: bold;
}