/* 导航栏 */
nav {
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.8) 0%, rgba(255, 255, 255, 0) 100%);
    color: white;
    font-weight: bold;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    /* 使用space-between将内容分布在两端 */
    align-items: center;
}

nav img {
    margin-right: 50px;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

/* 导航栏字体css */
nav a:hover {
    color: #59baff;
    /* 鼠标悬停时文字颜色 */
}

nav a {
    color: white;
    /* 默认文字颜色 */
    text-decoration: none;
    /* 去除下划线 */
    transition: color 0.3s ease;
    margin-right: 50px;
    /* 文字间距 */
    font-size: 25px;
    /* 字体大小 */
}