body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #f4f4f4;
}
.container {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 300px;
    position: relative;
}
.form-group {
    margin-bottom: 15px;
}
.form-group label {
    display: block;
    margin-bottom: 5px;
}
.form-group input {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
}
.form-group button {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 5px;
}
.form-group button:hover {
    background-color: #0056b3;
}
.game-container {
    margin-top: 20px;
}
.logout-button {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 5px 10px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
.register-link, .unregister-link {
    display: block;
    margin-top: 10px;
    text-align: center;
    color: #007bff;
    text-decoration: none;
    cursor: pointer;
}
.register-link:hover, .unregister-link:hover {
    text-decoration: underline;
}
.return-link {
    position: absolute;
    top: 10px;
    left: 10px;
    color: #007bff;
    text-decoration: none;
    cursor: pointer;
}
.return-link:hover {
    text-decoration: underline;
}
.unregister-form {
    display: none;
}
#version-text {
    cursor: pointer;
    user-select: none;
    /* 防止文本被选中*/
    
}