:root {
            --primary-black: #1a1a1a;
            --primary-yellow: #ffc107;
            --primary-red: #dc3545;
            --white: #ffffff;
            --gray-light: #f8f9fa;
            --gray-medium: #e9ecef;
            --transition: all 0.3s ease;
			--primary-color: #ff6b00;
			--primary-dark: #e55d00;
            --text-dark: #333;
            --text-medium: #666;
            --text-light: #999;
            --bg-light: #f8f9fa;
            --border-color: #e1e1e1;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --dark-blue: #1a2a4f;
			--light-gray: #f8f9fa;
			--primary-orange: #ff6b00;
			--primary-blue: #0a2a5e;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Roboto', 'Segoe UI', sans-serif;
            color: var(--primary-black);
            line-height: 1.6;
            overflow-x: hidden;
        }
		/* === 清除链接默认样式 === */
		a {
		    text-decoration: none;   /* 去除下划线 */
		    color: inherit;           /* 继承父元素文字颜色（避免默认蓝色） */
		    outline: none;            /* 移除点击时的焦点轮廓（需补充可访问性样式） */
		}
		
		/* === 清除列表默认样式 === */
		ul, li {
		    list-style: none;         /* 去除项目符号（圆点/数字） */
		    margin: 0;                /* 清除外边距 */
		    padding: 0;               /* 清除内边距 */
		}
        /* ======== Navigation Styles ======== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 3%;
            z-index: 1000;
            transition: var(--transition);
            background-color: transparent;
        }

        .navbar.scrolled {
            background-color: var(--white);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            padding: 10px 3%;
        }

        .navbar.scrolled .logo img {
            height: 60px;
        }

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

        .logo img {
            height: 60px;
            transition: var(--transition);
			transition: opacity 0.3s ease;
        }
        .logo .logo-color {
            display: none;
            opacity: 0;
        }
        .navbar.scrolled .logo-white {
            display: none;
            opacity: 0;
        }
        .navbar.scrolled .logo-color {
            display: block;
            opacity: 1;
        }
        .logo .logo-white {
            display: block;
            opacity: 1;
        }
        .nav-menu {
            display: flex;
            list-style: none;
            /*flex-wrap: wrap;  允许换行 */
            justify-content: center; /* 居中显示 */
           /* max-width: 75%;  限制最大宽度 */
        }

        .nav-item {
            position: relative;
            margin: 0 6px;
        }

        .nav-link {
            color: var(--white);
            text-decoration: none;
            font-weight: 500;
            font-size: 16px;
            padding: 8px 0;
            position: relative;
            transition: var(--transition);
            text-transform: uppercase;
            white-space: nowrap;
        }

        .navbar.scrolled .nav-link {
            color: var(--primary-black);
        }
       

        .nav-link:hover {
            color: var(--primary-yellow);
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-yellow);
            transition: var(--transition);
        }

        .nav-link:hover::after {
            width: 100%;
        }

        .dropdown-menu {
            position: absolute;
            top: 100%;
            left: 0;
            background: var(--white);
            min-width: 220px;
            padding: 15px 0;
            border-radius: 4px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: var(--transition);
            z-index: 10;
        }

        .dropdown-item {
            display: block;
            padding: 8px 20px;
            text-decoration: none;
            color: var(--primary-black);
            font-size: 14px;
            transition: var(--transition);
        }

        .dropdown-item:hover {
            background: var(--gray-light);
            color: var(--primary-red);
        }

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

        .nav-icons {
            display: flex;
            align-items: center;
        }

        .search-icon, .language-switcher {
            color: var(--white);
            font-size: 18px;
            margin-left: 20px;
            cursor: pointer;
            transition: var(--transition);
        }

        .navbar.scrolled .search-icon,
        .navbar.scrolled .language-switcher {
            color: var(--primary-black);
        }

        .search-icon:hover, .language-switcher:hover {
            color: var(--primary-yellow);
        }

        .hamburger {
            display: none;
            cursor: pointer;
        }

        .hamburger div {
            width: 25px;
            height: 3px;
            background: var(--white);
            margin: 5px;
            transition: var(--transition);
        }

        .navbar.scrolled .hamburger div {
            background: var(--primary-black);
        }

        /* ======== Mobile Menu ======== */
        .mobile-menu {
            position: fixed;
            top: 0;
            right: -100%;
            width: 300px;
            height: 100vh;
            background: var(--white);
            z-index: 2000;
            padding: 80px 30px 30px;
            overflow-y: auto;
            transition: var(--transition);
            box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        }

        .mobile-menu.active {
            right: 0;
        }

        .mobile-nav-item {
            margin-bottom: 15px;
        }

        .mobile-nav-link {
            display: block;
            padding: 10px 0;
            color: var(--primary-black);
            text-decoration: none;
            font-weight: 500;
            border-bottom: 1px solid var(--gray-medium);
        }

        .mobile-dropdown {
            padding-left: 15px;
            max-height: 0;
            overflow: hidden;
            transition: var(--transition);
        }

        .mobile-dropdown.active {
            max-height: 1000px;
        }

        .mobile-dropdown-item {
            display: block;
            padding: 8px 0;
            color: #555;
            text-decoration: none;
            font-size: 14px;
        }

        .mobile-dropdown-toggle {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .close-menu {
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 24px;
            color: var(--primary-black);
            cursor: pointer;
        }
		/* ========= 修改开始 ========= */
@media (max-width: 1024px) {
    .nav-menu, .nav-icons {
        display: none;
    }
    
    .hamburger {
        display: block;
    }
}

/* 新增大屏幕样式 - 屏幕宽度大于1394px时显示电脑端导航 */
@media (min-width: 1025px) {
    .nav-menu, .nav-icons {
        display: flex;
    }
    
    .hamburger {
        display: none;
    }
}
/* 页脚容器 */
        .site-footer {
            background: linear-gradient(135deg, #1a2a3a 0%, #0d1b26 100%);
            color: #fff;
            padding: 60px 5% 30px;
            width: 100%;
            position: relative;
            overflow: hidden;
        }
        
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            max-width: 1400px;
            margin: 0 auto;
            position: relative;
        }
        
        /* 页脚装饰元素 */
        .footer-decoration {
            position: absolute;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 50%;
        }
        
        .decoration-1 {
            width: 300px;
            height: 300px;
            top: -150px;
            right: -150px;
        }
        
        .decoration-2 {
            width: 200px;
            height: 200px;
            bottom: -100px;
            left: -100px;
        }
        
        /* 页脚列样式 */
        .footer-column {
            flex: 1;
            min-width: 250px;
            margin-bottom: 30px;
            padding: 0 20px;
        }
        
        .footer-column h3 {
            font-size: 20px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
            font-weight: 600;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: #ff6b00;
        }
        
        /* 第一列 - Logo和联系信息 */
        .footer-logo img {
            max-width: 260px;
            margin-bottom: 20px;
            
        }
        
        .footer-contact {
            margin-bottom: 15px;
            display: flex;
            align-items: flex-start;
        }
        
        .contact-icon {
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            flex-shrink: 0;
        }
        
        .footer-contact-info {
            line-height: 1.6;
        }
        
        .footer-contact-info h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 3px;
        }
        
        .footer-contact-info p, .footer-contact-info a {
            color: #a0b1c5;
            font-size: 14px;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-contact-info a:hover {
            color: #ff6b00;
        }
        
        .social-links {
            display: flex;
            margin-top: 20px;
        }
        
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            margin-right: 10px;
            transition: all 0.3s;
        }
        
        .social-links a:hover {
            background: #ff6b00;
            transform: translateY(-3px);
        }
        
        /* 第二列 - 产品列表 */
        .footer-products ul {
            list-style: none;
        }
        
        .footer-products li {
            margin-bottom: 12px;
        }
        
        .footer-products a {
            color: #a0b1c5;
            text-decoration: none;
            font-size: 15px;
            display: block;
            transition: all 0.3s;
            position: relative;
            padding-left: 15px;
        }
        
        .footer-products a::before {
            content: '→';
            position: absolute;
            left: 0;
            color: #ff6b00;
            opacity: 0;
            transition: opacity 0.3s;
        }
        
        .footer-products a:hover {
            color: #fff;
            padding-left: 20px;
        }
        
        .footer-products a:hover::before {
            opacity: 1;
        }
        
        /* 第三列 - 热门标签 */
        .footer-tags .tags-container {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        
        .footer-tags .tag {
            display: inline-block;
            background: rgba(255, 255, 255, 0.08);
            color: #a0b1c5;
            padding: 8px 15px;
            border-radius: 30px;
            font-size: 13px;
            text-decoration: none;
            transition: all 0.3s;
        }
        
        .footer-tags .tag:hover {
            background: #ff6b00;
            color: #fff;
            transform: translateY(-3px);
        }
        
        /* 第四列 - 留言表单 */
        .footer-form input,
        .footer-form textarea {
            width: 100%;
            padding: 12px 15px;
            margin-bottom: 15px;
            background: rgba(255, 255, 255, 0.08);
            border: none;
            border-radius: 5px;
            color: #fff;
            font-size: 14px;
        }
        
        .footer-form input::placeholder,
        .footer-form textarea::placeholder {
            color: #a0b1c5;
        }
        
        .footer-form textarea {
            height: 100px;
            resize: vertical;
        }
        
        .footer-form button {
            background: #ff6b00;
            color: #fff;
            border: none;
            padding: 12px 30px;
            border-radius: 5px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
        }
        
        .footer-form button:hover {
            background: #ff8c3a;
            transform: translateY(-3px);
        }
        
        .footer-form button i {
            margin-left: 8px;
        }
        
        /* 底部版权信息 */
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 25px;
            margin-top: 30px;
            text-align: center;
            font-size: 14px;
            color: #a0b1c5;
        }
        
        .footer-bottom a {
            color: #ff6b00;
            text-decoration: none;
            margin: 0 10px;
            transition: color 0.3s;
        }
        
        .footer-bottom a:hover {
            color: #ff8c3a;
        }
        
        .footer-bottom .copyright {
            margin-top: 10px;
        }
        
        /* 响应式设计 */
        @media (max-width: 1100px) {
            .footer-column {
                flex: 1 1 45%;
            }
        }
        
        @media (max-width: 768px) {
            .footer-column {
                flex: 1 1 100%;
            }
            
            .footer-column h3::after {
                width: 40px;
            }
            
            .footer-container {
                padding: 0;
            }
        }
        
        @media (max-width: 480px) {
            .site-footer {
                padding: 40px 20px 20px;
            }
            
            .footer-column {
                padding: 0 0 25px;
            }
        }
/* back-to-top */
#back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background-color: red;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
	z-index:1999;
}


#back-to-top .arrow {
    width: 12px;
    height: 12px;
    border-top: 3px solid white;
    border-right: 3px solid white;
    transform: rotate(-45deg);
}


#back-to-top.show {
    opacity: 1;
    visibility: visible;
}


#back-to-top:active {
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}


#back-to-top:hover {
    background-color: darkred;
}

/* 遮罩层样式 */
        .overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1000;
        }
        
        /* 悬浮表单样式 */
        .floating-form {
            display: none;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 500px;
            max-width: 90%;
            padding: 30px;
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 5px 25px rgba(0, 0, 0, 0.2);
            z-index: 1001;
        }
        
        .form-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        
        .form-title {
            font-size: 22px;
            font-weight: 600;
            color: #333;
        }
        
        .close-btn {
            font-size: 20px;
            cursor: pointer;
            color: #999;
            background: none;
            border: none;
            transition: color 0.3s;
        }
        
        .close-btn:hover {
            color: #e74c3c;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: #555;
        }
        
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        
        .form-control:focus {
            border-color: #3498db;
            outline: none;
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }
        
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        
        .upload-label {
            display: block;
            padding: 12px;
            background: #f8f9fa;
            border: 1px dashed #ddd;
            border-radius: 4px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .upload-label:hover {
            background: #e9ecef;
            border-color: #3498db;
        }
        
        .file-name {
            display: block;
            margin-top: 5px;
            font-size: 14px;
            color: #666;
        }
        
        #fileInput {
            display: none;
        }
        
        .submit-btn {
            width: 100%;
            padding: 14px;
            background: #3498db;
            color: white;
            border: none;
            border-radius: 4px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        
        .submit-btn:hover {
            background: #2980b9;
        }
        
        @media (max-width: 576px) {
            .floating-form {
                width: 95%;
                padding: 20px;
            }
        }