body {
    font-family: 'Microsoft YaHei', sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #333;
}
.container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 30px;
    max-width: 500px;
    width: 90%;
    text-align: center;
}
h1 {
    color: #2c3e50;
}
.options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 20px;
}
.option {
    padding: 10px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}
.option:hover {
    background: #2980b9;
}
#result {
    margin-top: 20px;
    font-weight: bold;
}