* {
    padding: 0;
    margin: 0;
}

ul,
ol {
    list-style: none;
}


nav .nav-links ul {
    display: flex;
    flex-direction: row;
}

nav .nav-links ul li {
    padding: 0 4px;
    list-style: none;
}

nav .nav-links ul li img {
    transform: scale(0.45);
}

nav {
    position: fixed;
    z-index: 100;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0px;
}

a {
    text-decoration: none;
    color: #232323;
}

.logo_navigation_bar img {
    width: auto;
    height: 50px;
    position: relative;
    display: inline-block;
    vertical-align: center;
}

.logo_navigation_bar {
    margin-left: 10px;
}

.logo_navigation_bar #项目标识2 {
    filter: contrast(100%) brightness(200%);
}

.navbar {
    width: 100%;
    height: 40px;
    position: fixed;
    padding: auto;
    background: rgba(5, 42, 122, 0.8);
    backdrop-filter: blur(40px);
    justify-content: space-between;
    font-family: Arial;
    transition: transform 0.3s ease-in-out;
    display: flex;
}


.navbar-toggler {
    position: absolute;
    width: 40px;
    background-color: #2b2b2b;
    color: #ffffff;
    font-size: 28px;
    font-weight: bold;
    top: 10px;
    right: 30px;
    border-radius: 8%
}

.appear {
    transform: translateY(54px);
}

@media (min-width: 769px) {
    .navbar {
        display: flex;
    }

    .navbar-toggler {
        display: none;
    }

    .flex_nav {
        display: flex;
        justify-content: space-evenly;
        margin-right: 100px;
    }

    .flex_nav :hover>ul {
        display: block;
    }

    .item:hover {
        transition: all 0.1s ease;
        background: #173b94;
        border-radius: 10px;
    }

    .two_item a:hover {
        color: #ffffff;
        font-size: 16px;
    }

    .navbar .item {
        height: 54px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 12px;
        white-space: nowrap;
        cursor: auto;
    }

    .item>a {
        color: #ffffff;
        font-size: 16px;
    }

    .menu {
        display: block;
        position: relative;
        z-index: 100;
        transition: all 0.2s ease;
    }

    .two_item {
        width: 165px;
        display: none;
        position: absolute;
        top: 54px;
        left: 0;
        background: rgba(22, 73, 184, 0.95);
        border-radius: 10px;
    }

    #list1 {
        width: 160px;
    }

    #list2 {
        width: 220px;
    }

    #list3 {
        width: 180px;
    }

    #list4 {
        width: 140px;
    }

    #list5 {
        width: 300px;
    }

    #list6 {
        width: 140px;
    }

    .two_item li {
        text-align: left;
        font-size: 14px;
        position: static;
    }

    .two_item a {
        color: #ffffff;
        display: block;
        width: 150px;
        line-height: 40px;
        padding: 8px 15px;
        transition: font-size 0.3s ease;
    }

}

@media (max-width: 768px) {
    .navbar {
        display: block;
    }

    .navbar-toggler {
        display: block;
    }

    .flex_nav {
        margin-top: 0px;
        background-color: rgba(130, 162, 231, 0.95);
        max-height: 0;
        overflow: hidden;
        transition: all 0.3s ease-in-out;
    }

    .two_item {
        display: none;
        top: 50px;
        left: 0;
        background-color:#eeeeee;
        border-radius: 4px;
        padding-top: 3px;
        padding-bottom: 3px;
        padding-left: 20px;
        left: 20px;
    }

    .active {
        max-height: 1000px;
        transition: all 0.3s ease-in-out;
    }

    .item {
        padding: 5px;
        font-size: 20px;
    }

    .item>a {
        color: #f2ffdd;
        font-size: 20px;
    }

    .two_item li {
        padding-top: 6px;
        text-align: left;
        font-size: 18px;
        position: static;

    }
}

#scroll_progress {
    padding: 0;
    margin: 0;
    position: fixed;
    top: 60px;
    width: 0%;
    height: 5px;
    background: #1f8acc;
    z-index: 10;
    left: 0;
}