body {
    margin: 0;
    padding: 0;
    font-family: "Noto Sans", sans-serif;

    background: #F4F5F9;
}


*,
::after,
::before {
    box-sizing: border-box;
}

.container {
    max-width: 1200px;
    margin: auto;
    width: 100%;
    padding: 0 15px;
}

a{
    text-decoration: none;
}

header {
    position: relative;
    padding: 0px 0px;
    border-bottom: 1px solid #D2D5DB;
    background: #FFF;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0px 20px;
    max-width: 1140px;
    margin: auto;
}

.nav-links {
    display: flex;
    list-style-type: none;
    margin: 0;
    padding: 0;
}

.nav-links li a {
    color: #666;
    text-decoration: none;
    text-transform: capitalize;
    font-size: 16px;
    font-weight: 500;
    padding: 20px 10px;
    display: block;
}

.nav-links li a:hover {
    color: #4973E5;
}

.nav-links li a img {
    width: 24px;
    aspect-ratio: auto;
}

.burger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 15px;
}

.line1,
.line2,
.line3 {
    width: 22px;
    height: 2px;
    background-color: #333;
    margin: 2px;
}

.logo a {
    font-size: 30px;
    line-height: 34px;
    color: #333;
    padding: 10px 10px;
    display: block;
    font-weight: 700;
    text-transform: capitalize;
    text-decoration: none;
}




@media screen and (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        /* 将导航链接改为纵向布局 */
        background-color: #fff;
        /* 为导航链接添加背景色 */
        padding: 10px;
        /* 为导航链接添加内边距 */
        position: absolute;
        top: 0px;
        left: 0;
        width: 100%;
        box-sizing: border-box;
        z-index: 9999;
        padding-top: 60px;
        height: 100vh;
    }

    .navbar {
        padding: 0px 0px;
    }

    .logo a {
        padding: 8px 15px;
        font-size: 24px;
        line-height: 26px;
    }

    .nav-links.nav-active {
        display: flex;
        position: fixed;
    }

    .nav-links li a {
        padding: 10px 10px;
        color: #333;
        text-align: center;
    }

    .burger {
        display: flex;
        padding: 10px 15px;
    }

    .toggle {
        position: fixed;
        z-index: 9999;
        right: 6px;
        font-size: 24px;
        top: 0px;
        color: #333;
    }


}

footer {
    margin-top: 50px;
    padding: 20px 10px;
    position: relative;
    background: #4973E5;
}

footer .pt p,
footer .pb {
    color: #fff;
    text-align: center;
    font-size: 16px;
    font-style: normal;
    font-weight: 500;
    line-height: 20px;
    margin-bottom: 0;
}

footer .pb {
    padding-bottom: 10px;
}

footer .pb a {
    color: #fff;
    padding: 0 20px 0;
    text-decoration: underline;
    display: inline;
}


@media (max-width:550px) {

    footer .pt p,
    footer .pb {
        font-size: 14px;
        line-height: 18px;
    }

    footer .pb {
        padding-bottom: 10px;
    }

    footer .pb a {
        padding: 0 14px 0;
    }
}


.back-to-top {
    border: none;
    position: fixed;
    bottom: 160px;
    right: 65px;
    z-index: 99;
    cursor: pointer;
    display: none;
    border-radius: 50%;
    background-color: transparent;
}

.back-to-top i {
    font-size: 30px;
    color: #7987AD;
}


#copy-message {
    position: fixed;
    z-index: 999;
    bottom: 30%;
    width: 60px;
    height: 28px;
    left: 50%;
    transform: translate(-50%, 0);
    background: #fff;
    border: 1px solid #d9d9d9;
    color: #333;
    font-size: 12px;
    text-align: center;
    line-height: 28px;
    border-radius: 20px;
}