/* 简单的页面样式，让页面更美观 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    text-align: center;
}

h1 {
    color: #165DFF;
    margin-bottom: 20px;
}

p {
    color: #666;
    margin-bottom: 30px;
    font-size: 16px;
}

button {
    background: #165DFF;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #0040C9;
}

#msg {
    margin-top: 20px;
    color: #165DFF;
    font-weight: bold;
}