body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.login-container {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}
h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}
.form-group {
    margin-bottom: 20px;
}
label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}
input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}
button {
    width: 100%;
    padding: 12px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}
button:hover {
    background-color: #45a049;
}
.error {
    color: red;
    margin-top: 10px;
    text-align: center;
}

.error-message {
    color: #ff4444; /* 红色 */
    font-size: 14px;
    margin-top: 5px;
    display: none; /* 默认隐藏 */
}