/* CSS 变量定义 */
:root {
    --primary-blue: #025FF2;
    /* 浅蓝色 */
    --dark-blue: #004d99;
    /* 深蓝色，用于导航栏和页脚 */
    --light-bg: #f8f9fa;
    --success-green: #28a745;
    /* 绿色成功模块背景色 */
    --text-color: #000;
}

/* 基础样式和布局 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 移除 container 的最大宽度限制，并调整 padding */
.container {
    margin: 0 auto;
    padding: 0 5vw;
    box-sizing: border-box;
}

h1,
h2,
h3 {
    margin-top: 0;
}

/* --- 全局 Logo 图片替换样式 (来自您之前的要求) --- */
.logo {}

@media only screen and (-webkit-min-device-pixel-ratio: 2),
only screen and (min-resolution: 2dppx) {
    .logo {}
}

@media only screen and (-webkit-min-device-pixel-ratio: 3),
only screen and (min-resolution: 3dppx) {
    .logo {}
}


/* 导航栏和内容浮于视频之上 */
.header-nav {
    background-color: var(--primary-blue);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 23px 5vw;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    /* 确保导航在最上层 */
}

.header-nav a {
    color: white;
    text-decoration: none;
    font-size: 1.5em;
}

.header-nav a.nav_connect {
    border: 1px solid #fff;
    padding: 0 20px;
    margin-top:10px;
    border-radius: 6px;
}
.header-nav nav {
    /* 确保 nav 容器使用 flex */
    display: flex;
}
.main-menu {
    list-style: none; /* 移除列表点 */
    padding: 0;
    margin: 0;
    display: flex; /* 让主菜单项横向排列 */
}
.main-menu > li {
    margin-left: 35px; /* 菜单项间距 */
    position: relative; /* 关键：确保下拉菜单基于此项定位 */
}
top-menu-li:last-child{
    padding: 0 20px;
}
.main-menu li:last-child{
    /*text-align: center;*/
}
.main-menu a {
    /* 继承原有的链接样式，保持白色 */
    color: white;
    text-decoration: none;
    padding: 10px 0; /* 增加点击区域 */
    display: flex;
}
.main-menu li a.has_child span{
    display: inline-block;
    width: 20px;
    height: 20px;
    margin-left:3px;
    margin-top: 2px;
    background-image: url("../images/nav_icon_down@2x.png");
    background-size: cover;
}

/* --- 下拉菜单容器样式 --- */
.submenu {
    list-style: none;
    padding: 10px 0;
    margin: 0;

    /* 下拉菜单定位 */
    position: absolute;
    top: 100%; /* 位于父链接下方 */
    left: 50%;
    transform: translateX(-50%); /* 居中对齐 */

    /* 样式 */


    /* 默认隐藏 */
    opacity: 0;
    visibility: hidden;

    /*opacity: 1;*/
    /*visibility: visible;*/
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 99; /* 确保它在页面其他元素之上 */
}
.submenu li a {
    /* 下拉菜单内的链接样式 */
    font-size: 1.5em;
    color: #fff; /* 黑色文本 */
    padding: 8px 15px;
    white-space: nowrap; /* 防止文本换行 */
    background-color: var(--primary-blue);/* 下拉菜单背景色 */
}
.submenu li a:hover {
    background-color: var(--light-bg); /* 悬停时的背景色 */
    color: var(--primary-blue);
}

/* --- 悬停显示交互 --- */
.dropdown:hover > .submenu {
    opacity: 1;
    visibility: visible;
}

.main-menu li a.has_child:hover > span {
    background-image: url("../images/nav_icon_up@2x.png");
}

/* --- 7. 页脚 CTA (深蓝色背景，统一结构) --- */
.footer-bg {
    background-color: var(--primary-blue);
    color: white;
    padding: 60px 0 20px;
    border-radius: 30px 30px 0 0;
}

.footer-cta-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    /* max-width: 1200px; */
    margin: 0 auto 30px;
    padding: 0 0 30px;
}

.footer-cta-top h2 {
    font-size: 4em;
    margin: 5px 0;
}

.footer-cta-arrow {
    width: 49px;
    height: 49px;
    background: url("../images/Nav_icon01_normal.png");
    background-size: cover;
}

.footer-cta-top:hover .footer-cta-arrow {
    width: 123px;
    height: 49px;
    background: url("../images/Nav_icon01_hover.png");
    background-size: cover;
}

.footer-bottom-info {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    /* max-width: 1200px; */
    margin: 0 auto;
    /* padding: 0 5vw; */
}

.footer-logo-info {
    max-width: 250px;
}

.footer-logo-info .logo {
    font-size: 24px;
    font-weight: bold;
}

.footer-links {
    width: 65%;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.footer-links div {
    width: 30%;
    text-align: left;
}

.footer-links h4 {
    font-size: 1.5em;
    margin-bottom: 10px;
}

.footer-links a {
    display: block;
    color: white;
    text-decoration: none;
    font-size: 1.5em;
    margin-bottom: 5px;
    opacity: 0.5;
}


/* --- H5 兼容性 (媒体查询) --- */
@media (max-width: 768px) {




    /* 页脚堆叠 */
    .footer-cta-top {
        flex-direction: column;
        align-items: flex-start;
        padding: 0 5vw 30px;
    }

    .footer-cta-arrow {
        margin-top: 20px;
    }

    .footer-bottom-info {
        flex-direction: column;
        gap: 30px;
        padding: 0 5vw;
    }

    .footer-links {
        flex-direction: column;
        gap: 20px;
    }

    .share_copyright {
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
    }

    .share_copyright .social-icons {
        width: 50%;
    }

    .share_copyright .copyright {
        width: 50%;
        text-align: center;
        margin-top: 20px;
    }
}