/* 登录界面样式 */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f4f8;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    padding: 0; 
    /* 渐变背景 */
    background: linear-gradient(125deg,#2c3e50,#27ae60,#2980b9,#e74c3c,#8e44ad);
    background: linear-gradient(125deg,#acecea,#27ae60,#2980b9,#f3d9e4,#e74c3c);
    /* 指定背景图像的大小 */
    background-size: 500%;
    /* 执行动画：动画名 时长 线性的 无限次播放 */
    animation: bgAnimation 15s linear infinite;
}
/* 定义动画 */
@keyframes bgAnimation {
    0%{
        background-position: 0% 50%;
    }
    50%{
        background-position: 100% 50%;
    }
    100%{
        background-position: 0% 50%;
    }
}
h2 {
    margin-bottom: 20px;
    color: #333;
    font-size: 24px;
    text-align: center;
}

form {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 300px;
    text-align: center;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 15px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-sizing: border-box;
    font-size: 16px;
}

button[type="button"] {
    width: 100%;
    padding: 15px;
    background-color: #007bff;
    border: none;
    border-radius: 5px;
    color: #ffffff;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button[type="button"]:hover {
    background-color: #0056b3;
}

a {
    display: block;
    margin-top: 15px;
    color: #007bff;
    text-decoration: none;
    font-size: 14px;
}

a:hover {
    text-decoration: underline;
}

/* 修正链接中的按钮样式 */
a button {
    background-color: transparent;
    border: none;
    color: #007bff;
    padding: 0;
    font-size: 14px;
    cursor: pointer;
}