/* 导航栏整体样式 */
nav {
    background-color: #ffffff;
    /* 深蓝色背景 */
    padding: 10px 0;
    /* 上下内边距 */
    font-family: 'Roboto', sans-serif;
    /* 现代无衬线字体 */
}

/* 导航列表样式 */
nav ul {
    list-style: none;
    /* 移除默认列表样式 */
    margin: 0;
    padding: 0;
    display: flex;
    /* 水平排列 */
    justify-content: center;
    /* 居中对齐 */
    align-items: center;
    /* 垂直居中 */
}

/* 导航项样式 */
nav ul li {
    position: relative;
    /* 为下拉菜单定位 */
    margin: 0 20px;
    /* 导航项之间的间距 */
}

nav ul li.logo {
    display: flex;
    align-items: center;
}

nav ul li.logo img {
    width: 120px;
}

/* 导航链接样式 */
nav ul li a {
    color: #000000;
    /* 浅灰色文字 */
    text-decoration: none;
    /* 移除下划线 */
    padding: 10px 15px;
    /* 内边距 */
    display: block;
    /* 填充整个区域 */
    transition: background-color 0.3s ease;
    /* 背景色平滑过渡 */
}

nav ul li a .zuua_triangle {
    display: flex;
    /* 使子元素在主轴上居中对齐 */
    justify-content: center;
    /* 使子元素在交叉轴上居中对齐 */
    align-items: center;
}

nav ul li a .zuua_triangle::after {
    content: ' ';
    width: 0;
    height: 0;
    border-width: 4px 4px 0;
    border-style: solid;
    border-color: #999 transparent transparent;
    margin-left: 5px;
    -webkit-transition: all 0.2s ease;
    transition: all 0.2s ease;
}

/* 悬停效果 */
nav ul li a:hover {
    color: #ff3636;
    border-radius: 5px;
}

nav ul li a:hover .zuua_triangle::after {
    border-color: #ff3636 transparent transparent;
}

.dropdown-content {
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
    z-index: 1;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.yspzb {
    padding: 42px 50px;
    left: -52%;
}

.help-drop {
    left: -25%;
}

.dropdown-content .zuua_menu {
    width: 210px;
    display: flex;
    flex-direction: column;
}

.dropdown-content .zuua_menu .zuua_menu_li {
    color: #68747F;
    font-size: 14px;
}

.dropdown-content .zuua_menu h3 {
    font-size: 0.975rem;
    font-weight: 500;
    text-align: left;
    color: #3e464c;
    border-bottom: 1px solid #eaeaea;
}

.dropdown:hover .dropdown-content {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {
    background-color: #f1f1f1;
}


footer {
    padding: 24px 0;
    background-color: #2c3134;
    display: flex;
    flex-direction: column;
    align-items: center;
}

footer a {
    color: inherit;
    /* 继承父元素的文本颜色 */
    text-decoration: none;
    /* 去除下划线 */
    outline: none;
    /* 去除点击时的外边框 */
    cursor: pointer;
    /* 保持鼠标指针为手型 */
}

footer a:active,
footer a:focus {
    outline: none;
    /* 去除激活和聚焦时的外边框 */
}



.footer_main {
    padding: 30px;
    max-width: 1200px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}


/* 每一列的样式 */
.zuua_col4 {
    padding: 0 16px;
    min-width: 280px;
    margin-bottom: 20px;
}

/* 列内部盒子样式 */


.zuua_col4_box img {
    width: 156px;
}

/* 菜单标题样式 */
.menu-label {
    font-size: 16px;
    font-weight: normal;
    color: #ffffff;
    padding-bottom: 10px;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

/* 菜单列表样式 */
.menu-list {
    list-style-type: none;
    font-size: 14px;
    padding: 0;
}

/* 列表项样式 */
.menu-list li {
    margin-bottom: 8px;
}

/* 链接样式 */
.menu-list a {
    color: #6c757d;
    text-decoration: none;
    transition: color 0.3s ease;
}

/* 链接悬停样式 */
.menu-list a:hover {
    color: #007bff;
    text-decoration: underline;
}



.m-nav {
    display: none;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    position: relative;
    height: 70px;
    background-color: #fff;
}

.m-nav .m-menu {
    position: absolute;
    top: 70px;
    left: 8px;
    width: 400px;
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    transform: translateY(-10px);
    opacity: 0;
}

.m-nav .m-menu.active {
    display: block;
    transform: translateY(0);
    opacity: 1;
}

.m-nav .m-menu .m-menu-list {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
}

.m-nav .m-menu ul li {
    width: 100%;
}

.m-nav .m-menu ul li>a {
    width: 100%;
    display: flex;
    align-items: center;
    padding: 16px 24px;
    justify-content: space-between;
    border-bottom: 1px solid #eaeaea;
    color: #68747f;
    font-weight: 800;
    text-decoration: none;
    position: relative;
}

.m-nav .m-menu .submenu-parent .submenu {
    display: none;
    width: 100%;
    background-color: #f8f9fa;
}

.m-nav .m-menu .submenu-parent.active .submenu {
    display: block;
}

.m-yspzb,
.m-help {
    position: relative;
    width: 100%;
}

.m-yspzb .mm-yspzb,
.m-help .mm-help {
    margin-left: 0;
}

.m-nav .m-menu img {
    width: 20px;
    height: auto;
}

.m-nav .menu-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.m-nav .menu-btn img {
    width: 32px;
    height: auto;
}

.m-nav .logo img {
    width: 120px;
    height: auto;
}

.submenu {
    width: calc(100% - 20px) !important;
    overflow: hidden !important;
    box-sizing: border-box !important;
}

.submenu>li a {
    padding: 16px 24px 16px 0 !important;
}

/* 手机端（屏幕宽度小于 768px） */
@media (max-width: 768px) {

    /* 导航栏样式调整 */
    .c-nav {
        display: none;
    }

    .m-nav {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 10px 20px;
    }




    /* 页脚样式调整 */
    footer.zuua_col4 {
        width: 100%;
        margin-bottom: 20px;
    }

    footer.zuua_col4:last-child {
        margin-bottom: 0;
    }

    footer.zuua_col4_box {
        text-align: center;
    }

    footer.zuua_col4_box img {
        max-width: 150px;
    }
}