/* 全局重置 & 基础样式 */
* {
    
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

:root {
    --primary-blue: #003366;
    --secondary-blue: #0066CC;
    --white: #FFFFFF;
    --gray-light: #F5F5F5;
    --gray: #777777;
    --black: #333333;
     --dark-blue: #002244;
    --border-gray: #ddd;
    --transition: all 0.3s ease;
    --light-gray: #F5F5F5;
}

body {
    color: var(--black);
    line-height: 1.6;
     font-size: 16px;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 0;
    font-weight: 600;
    text-transform: uppercase;
    transition: var(--transition);
    border: none;
    cursor: pointer;
     font-size: 14px;
}

.primary-btn {
    background-color: var(--secondary-blue);
    color: var(--white);
}

.primary-btn:hover {
    background-color: var(--primary-blue);
}

.quote-btn {
    background-color: var(--secondary-blue);
    color: var(--white);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
}

/* 头部样式 */
.header {
    background-color: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}



.logo {
  display: flex;
  align-items: center; /* 上下居中核心代码 */
  gap: 10px; /* 图片与文字间距 */
}



.logo img {
    height: 40px;
}

/* 仅作用于主导航的一级ul，避免影响下拉菜单 */
.main-nav > ul {
    display: flex;
    list-style: none;
}

/* 仅给一级li设置相对定位，作为下拉菜单容器 */
.main-nav > ul > li {
    position: relative;
    margin: 0 15px;
}

.main-nav ul li a {
    color: var(--black);
    text-decoration: none;
    font-weight: 500;
    text-transform: capitalize;
    font-size: 14px;
    padding: 10px 0;
    display: block;
}

.main-nav ul li a.active {
    color: var(--secondary-blue);
}

.main-nav ul li a:hover {
    color: var(--secondary-blue);
}

/* 下拉菜单 - 修复冲突后的样式 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 200px;
    display: none; /* 默认隐藏 */
    flex-direction: column; /* 强制纵向排列 */
    padding: 10px 0; /* 优化内边距 */
    z-index: 1001; /* 确保层级最高，不被遮挡 */
}

/* 下拉菜单项样式 */
.dropdown-menu li {
    list-style: none !important; 
    padding: 8px 15px; /* 增大点击区域 */
    margin: 0;
    width: 100%; /* 占满下拉菜单宽度 */
}

/* hover时显示下拉菜单 */
.dropdown:hover .dropdown-menu {
    display: flex;
}

.header-cta {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-cta .phone {
    color: var(--black);
    text-decoration: none;
    font-weight: 500;
}

.hamburger {
    position: relative;
    z-index: 99999;
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--black);
    cursor: pointer;
}



/* 页脚样式 */
.footer {
    background-color: var(--primary-blue);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h3, .footer-col h4 {
    text-transform: uppercase;
    margin-bottom: 20px;
    font-size: 18px;
}

.footer-about p {
    color: #ccc;
    margin-bottom: 20px;
}

.social-links a {
    color: var(--white);
    font-size: 18px;
    margin-right: 15px;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--secondary-blue);
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--white);
    padding-left: 5px;
}

.contact-list li {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}

.contact-list li i {
    margin-right: 10px;
    color: var(--secondary-blue);
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 20px;
    text-align: center;
}

.footer-bottom .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.footer-bottom p {
    color: #ccc;
    font-size: 14px;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    font-size: 14px;
    margin-left: 15px;
}

.footer-links a:hover {
    color: var(--white);
}


  /* 桌面端隐藏关闭按钮 */
    @media (min-width: 769px) {
        .mobile-close-btn {
            display: none !important;
        }
    }



    
/* 响应式样式 */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }

    .why-choose-container {
        flex-direction: column;
        text-align: center;
    }

    .why-choose-img {
        order: 2;
    }

    .why-choose-content {
        order: 1;
    }
}

@media (max-width: 768px) {


    /* 移动端菜单关闭按钮 */
    .mobile-close-btn {
        position: absolute;
        top: 20px;
        right: 20px;
        background: transparent;
        border: none;
        color: var(--white);
        font-size: 22px;
        cursor: pointer;
        outline: none;
        z-index: 1000;
    }

    .mobile-close-btn:hover {
        color: #e0e0e0; /* hover浅白色，提升交互反馈 */
    }

  



    
    .hamburger {
        display: block;
    }

    .main-nav {
         overflow-y: auto !important;
        -webkit-overflow-scrolling: touch !important;
        max-height: 100vh !important;
        
        position: fixed;
        top: 0;
        right: 0;
        /* height: 100vh; */
        width: 250px;
        background-color: var(--primary-blue);
        transform: translateX(100%);
        transition: var(--transition);
        padding: 30px;
        z-index: 999;
    }

    .main-nav.active {
        transform: translateX(0);
    }

    /* 移动端主导航改为纵向 */
    .main-nav > ul {
        flex-direction: column;
    }

    .main-nav > ul > li {
        margin: 15px 0;
    }

    .main-nav ul li a {
        color: var(--white);
    }

    /* 移动端下拉菜单样式适配 */
    .dropdown-menu {
        position: static;
        background-color: #004080;
        width: 100%;
        margin-top: 10px;
    }

    .header-cta {
        display: none;
    }

    .hero-content h1 {
        font-size: 36px;
    }

    .products h2, .applications h2 {
        font-size: 28px;
    }

    .why-choose-content h2 {
        font-size: 28px;
    }

    .footer-bottom .container {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        margin-top: 10px;
    }

    .footer-links a {
        margin: 0 5px;
    }
}

@media (max-width: 576px) {
    .hero {
        padding: 40px 0;
    }

    .features, .products, .why-choose-us, .applications {
        padding: 40px 0;
    }

    .hero-content h1 {
        font-size: 28px;
    }

    .products-grid, .applications-grid {
        grid-template-columns: 1fr;
    }
}


/* 面包屑导航（通用） */
.breadcrumb {
    padding: 15px 0;
    background-color: var(--light-gray);
    margin-bottom: 10px;
}

.breadcrumb ul {
    display: flex;
    align-items: center;
    list-style: none;
    font-size: 14px;
}

.breadcrumb ul li {
    display: flex;
    align-items: center;
    margin-right: 8px;
}

.breadcrumb ul li a {
    color: var(--secondary-blue);
    text-decoration: none;
}

.breadcrumb ul li a:hover {
    text-decoration: underline;
}

.breadcrumb ul li i {
    font-size: 12px;
    margin: 0 8px;
    color: var(--gray);
}