.auto-width {
    width: 75vw;
}

@media only screen and (max-width: 1366px) {
    .auto-width {
        width: 75vw;
        max-width: 768px;
    }
}
@media only screen and (min-width: 1920px) {
    .auto-width {
        width: 75vw;
        max-width: 1080px;
    }
}

@media only screen and (min-width: 2560px) {
    .auto-width {
        width: 75vw;
        max-width: 1440px;
    }
}

@media only screen and (min-width: 3840px) {
    .auto-width {
        width: 75vw;
        max-width: 2160px;
    }
}

.menu-box {
    background: rgba(0, 0, 0, 0.1901);
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9;
    width: 100%;
}


.main-menu {
    width: 100%;
    display: flex;
    align-items: center;
}

.main-menu .web-title {
    font-size: 19px;
    color: #FFFFFF;
    margin-right: 75px;
}

.main-menu .menu-a {
    flex: 1;

    .helps-wrapper {
        position: relative;
        display: inline-block;
    }

    #helps {
        cursor: pointer;
        padding: 15px;
        margin: 0;
    }

    .dropdown-content::before {
        content: '';
        position: absolute;
        top: -10px; /* 箭头高度 */
        left: 65px; /* 调整箭头水平位置 */
        border-width: 0 10px 10px; /* 控制三角形大小 */
        border-style: solid;
        border-color: transparent transparent white transparent; /* 箭头颜色跟随菜单背景 */
        filter: drop-shadow(0 -2px 2px rgba(0, 0, 0, 0.1)); /* 添加箭头阴影 */
    }

    .dropdown-content {
        top: calc(100% + 15px);
        display: none;
        position: absolute;
        left: -45px;
        background: white;
        min-width: 160px;
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
        z-index: 1;
        border-radius: 5px;
    }

    .dropdown-content a {
        display: block;
        padding: 12px 16px;
        text-decoration: none;
        color: #333;
        font-size: 14px;
    }

    .dropdown-content a:hover {
        background-color: #f1f1f1;
        border-radius: 5px;
    }
}

.menu-a a {
    color: #fff;
    padding: 0 25px;
    font-size: 16px;
}

.menu-a a.active {
    position: relative;
}

.menu-a a.active:after {
    content: '';
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 4px;
    background: #fff;
    border-radius: 3px 3px 3px 3px;
}

.menu-a a.active.blue-after:after {
    background: rgb(40, 120, 255);
}

.top-img {
    width: 100%;
}

.top-img img {
    width: 100%;
}
.main-menu .login {
    display: flex;
    align-items: center;

    a p {
        color: #fff;
        margin-right: 5px;
    }

    span {
        cursor: pointer;
    }

    span:nth-child(1) {
        width: 111px;
        height: 32px;
        background: #FFFFFF;
        border-radius: 18px 18px 18px 18px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: #2A7EFB;
        margin-right: 0px;
    }

    span:nth-child(2) {
        color: #fff;
        font-size: 16px;
    }
}