/* 头部样式 */
header {
    width: 100%;
    background: rgba(255, 247, 247, .84);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease-in-out;
}

.header-wrapper {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 26px 10px;
    transition: padding 0.3s ease-in-out;
    height: 100%;
}

/* 滚动后的头部样式 */
header.header-scrolled {
    background: #fff;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

header.header-scrolled .header-wrapper {
    padding: 10px 10px;
}

@media (min-width: 993px) {
    header.header-scrolled .top-nav {
        display: none;
    }
    header.header-scrolled .main-nav {
        margin-top: 0;
    }
    .nav-container {
        justify-content: center;
    }
    /* 桌面端隐藏下拉箭头 */
    .dropdown-arrow {
        display: none;
    }
}

header.header-scrolled .logo img {
    height: 45px;
    transition: height 0.3s ease-in-out;
}

/* Logo 样式 */
.logo {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    height: 100%;
}

.logo img {
    height: 60px;
    width: auto;
    transition: height 0.3s ease-in-out;
}

/* 导航容器 */
.nav-container {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    gap: 15px;
    transition: all 0.3s ease;
    height: 100%;
}

/* 顶部快捷导航 */
.top-nav {
    display: flex;
    gap: 30px;
    font-size: 14px;
    color: #666;
    transition: all 0.3s ease;
    align-items: center;
}

.top-nav li {
    display: flex;
    align-items: center;
    gap: 6px;
}

.top-nav li i {
    font-size: 14px;
    color: #2c353e;
    transition: color 0.3s ease;
}

.top-nav a {
    display: flex;
    align-items: center;
    gap: 6px;
}

.top-nav a:hover {
    color: #ac1f24;
}

.top-nav a:hover i {
    color: #ac1f24;
}

/* 主导航 */
.main-nav {
    display: flex;
    gap: 50px;
    font-weight: 500;
    align-items: center;
    transition: all 0.3s ease;
}
.main-nav li{
    position: relative;
    /* 移动端点击区域扩大 */
    cursor: pointer;
}
.main-nav a {
    padding: 8px 0;
    position: relative;
    font-size: 16px;
    display: block; /* 确保下划线宽度生效 */
}

/* 主导航下划线基础样式 */
.main-nav a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #ac1f24;
    transition: width 0.3s ease;
}

/* 鼠标悬浮显示下划线 */
.main-nav a:hover::after {
    width: 100%;
}

/* 展开状态下当前li的链接显示下划线 */
.main-nav li.active > a::after {
    width: 100%;
}

/* 下拉菜单样式 */
.main-nav .dropdown-menu {
    position: absolute;
    top: 140%;
    display: block;
    left: -16px;
    min-width: 100px;
    background-color: #fff;
    padding: 10px 0;
    margin-top: 5px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 999;
}
/* 桌面端悬浮显示下拉菜单 */
.main-nav li:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 下拉菜单项样式 */
.main-nav .dropdown-menu li {
    padding: 0 15px;
    border-bottom: none !important; /* 覆盖移动端边框 */
    line-height: normal !important; /* 覆盖移动端行高 */
    cursor: pointer;
}

/* 下拉菜单项链接样式 - 新增下划线 */
.main-nav .dropdown-menu li a {
    display: block;
    padding: 10px 0;
    font-size: 14px;
    color: #333;
    transition: all 0.3s ease;
    position: relative;
    width: 100%; /* 确保下划线宽度生效 */
}

/* 下拉菜单项下划线样式 */
.main-nav .dropdown-menu li a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #ac1f24;
    transition: width 0.3s ease;
}

/* 下拉菜单项hover显示下划线 */
.main-nav .dropdown-menu li a:hover::after {
    width: 100%;
}

/* 下拉菜单项hover效果 */
.main-nav .dropdown-menu li a:hover {
    color: #000;
    font-weight: bold;
    padding-left: 5px;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: #333;
    align-items: center;
    justify-content: center;
    height: 100%;
}

/* 下拉箭头样式 */
.dropdown-arrow {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 12px;
    color: #666;
    transition: transform 0.3s ease;
}
/* 箭头旋转样式 */
.main-nav li.active .dropdown-arrow {
    transform: translateY(-50%) rotate(90deg);
    color: #ac1f24;
}

/* 响应式样式 */
@media (max-width: 1048px) {

    .header-wrapper {
        flex-direction: row;
        align-items: center;
    }

    .nav-container {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: #fff;
        box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
        padding: 20px;
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        gap: 20px;
        transition: left 0.3s ease, top 0.3s ease;
        z-index: 99;
    }

    header.header-scrolled .nav-container {
        top: 64px;
    }

    .nav-container.active {
        left: 0;
    }
 
    .top-nav, .main-nav {
        flex-direction: column;
        gap: 15px;
        width: 100%;
        align-items: flex-start;
    }
    
    .main-nav li{
        display: block;
        width:100%;
        border-bottom: solid 1px rgba(82, 75, 75, 0.2);
        line-height: 25px;
        padding-right: 20px; /* 给箭头留空间 */
    }

    .top-nav {
        display: flex !important;
    }
    .top-nav li{
        display: block;
        width:100%;
        border-bottom: solid 1px rgba(82, 75, 75, 0.2);
        line-height: 50px;
    }
    .top-nav li a{color:#333;font-size:16px;}
    .top-nav li a i {
        display: none;
    }

    /* 移动端下拉菜单调整 */
    .main-nav .dropdown-menu {
        position: static; /* 改为静态定位 */
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        width: 100%;
        padding: 0 0 0 15px; /* 缩进显示 */
        display: none; /* 默认隐藏 */
        box-shadow: none;
        margin-top: 0;
    }
    /* 移动端展开下拉菜单 */
    .main-nav li.active .dropdown-menu {
        display: block;
    }
     .main-nav li.active .dropdown-menu li{
        display: block;
    }

    .menu-toggle {
        display: flex;
        margin-right:16px;
    }

    .overlay {
        display: none;
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 98;
        transition: top 0.3s ease;
    }

    header.header-scrolled ~ .overlay {
        top: 64px;
    }

    .overlay.active {
        display: block;
    }
}
/* @media (max-width: 1028px) {
    .news-banner{
        margin-top:112px;
    }
} */
@media (max-width: 767px) {
    .news-banner{
        margin-top:110px;
    }
}
@media (max-width: 576px) {
    .logo img {
        height: 45px;
    }

    .nav-container {
        top: 70px;
        height: calc(100vh - 70px);
    }
    .overlay {
        top: 70px;
    }

    header.header-scrolled ~ .overlay {
        top: 54px;
    }
}