/**
 * 首页导航栏 - 透明背景变体
 */
/**
 * 首页样式（华为风格 - 透明导航栏版本）
 */
        /* 科技蓝色主题变量 */
        :root {
            --tech-blue: #0063be;
            --dark-gray: #333333;
            --medium-gray: #666666;
            --light-gray: #F5F5F5;
            --white: #FFFFFF;
        }

        body {
            background: var(--white);
            color: var(--dark-gray);
          
        }

        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: transparent;
            height: 80px;
            transition: all 0.3s ease;
            box-shadow: none;
            border-bottom: 1px solid transparent;
        }

        nav.scrolled {
            background: white;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            height: 70px;
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }

        nav.scrolled .nav-links > li > a {
            color: #333333;
            font-weight: normal;
            text-shadow: none;
        }

        nav.scrolled .nav-links > li > a:hover {
            color: var(--tech-blue);
            text-shadow: none;
        }

        nav.scrolled .nav-links > li > a::after {
            background: var(--tech-blue);
            box-shadow: none;
        }

        nav.scrolled .logo-text {
            color: #333333;
            text-shadow: none;
        }

        nav.scrolled .nav-search i {
            color: #333333;
            text-shadow: none;
        }

        nav.scrolled .nav-search:hover {
            background: rgba(0, 99, 190, 0.1);
        }

        nav.scrolled .nav-search:hover i {
            color: var(--tech-blue);
            text-shadow: none;
        }

        /* 向下滚动时隐藏导航栏 */
        nav.hidden {
            transform: translateY(-100%);
            opacity: 0;
            pointer-events: none;
        }

        /* 向上滚动时导航栏固定在顶*/
        nav.visible {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }

        .nav-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0;
            height: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 1rem;
            height: 100%;
        }

        .logo a {
            display: flex;
            align-items: center;
            gap: 1rem;
            text-decoration: none;
            transition: opacity 0.3s ease;
        }

        .logo a:hover {
            opacity: 0.8;
        }

        .logo-img {       
            width: 380px;
            object-fit: contain;
            margin-top: 0px;
            transition: height 0.3s ease;
        }

        nav.scrolled .logo-img {
           width: 380px;
        }

        .logo-text {
            font-size: 1.3rem;
            font-weight: bold;
            color: white;
            letter-spacing: 1px;
            transition: font-size 0.3s ease;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5), 2px 2px 6px rgba(0, 0, 0, 0.3);
        }

        nav.scrolled .logo-text {
            font-size: 1.2rem;
        }

        .nav-links {
            display: flex;
            gap: 0;
            list-style: none;
            height: 100%;
        }

        .nav-links > li {
            position: relative;
            height: 100%;
            display: flex;
            align-items: center;
        }

        .nav-links > li > a {
            color: white;
            text-decoration: none;
            font-size: 1rem;
            font-weight: bold;
            padding: 0 2rem;
            height: 100%;
            display: flex;
            align-items: center;
            transition: all 0.3s ease;
            position: relative;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3), 2px 2px 6px rgba(0, 0, 0, 0.9);
        }

        .nav-links > li > a:hover {
            color: white;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.6), 3px 3px 8px rgba(0, 0, 0, 0.4);
        }

        .nav-links > li > a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 3px;
            background: white;
            transition: width 0.3s ease;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        }

        .nav-links > li:hover > a::after {
            width: 80%;
        }

        /* 下拉菜单 */
        .nav-links > li .dropdown {
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%) translateY(0);
            min-width: 220px;
            background: var(--white);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            padding: 1.5rem 0;
            z-index: 1001;
            border-top: 3px solid var(--tech-blue);
        }

        .nav-links > li:hover .dropdown {
            opacity: 1;
            visibility: visible;
            transform: translateX(-50%) translateY(0);
        }

        .dropdown-item {
            display: block;
            padding: 0.8rem 2rem;
            color: var(--tech-blue);
            text-decoration: none;
            font-size: 0.95rem;
            transition: all 0.3s ease;
            position: relative;
        }

        .dropdown-item:hover {
            background: rgba(0, 102, 204, 0.05);
            color: var(--tech-blue);
        }

        .dropdown-item:hover {
            color: var(--tech-blue);
            background: rgba(0, 125, 255, 0.05);
        }

        .dropdown-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 0;
            background: var(--tech-blue);
            transition: width 0.3s ease;
        }

        .dropdown-item:hover::before {
            width: 3px;
        }

        /* 导航栏右侧工具区 */
        .nav-tools {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            height: 100%;
        }

        .nav-search {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            border-radius: 50%;
            position: relative;
        }

        .nav-search:hover {
            background: rgba(0, 125, 255, 0.1);
            color: var(--tech-blue);
        }

        .nav-search i {
            font-size: 1.2rem;
            color: white;
            transition: color 0.3s ease;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5), 2px 2px 6px rgba(0, 0, 0, 0.3);
        }

        .nav-search:hover i {
            color: white;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.6), 3px 3px 8px rgba(0, 0, 0, 0.4);
        }

        /* 搜索框展开效果 */
        .search-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: var(--white);
            z-index: 1002;
            transform: translateY(-100%);
            opacity: 0;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            display: flex;
            align-items: center;
            padding: 0 5%;
        }

        .search-overlay.active {
            transform: translateY(0);
            opacity: 1;
        }

        nav.scrolled .search-overlay {
            height: 70px;
        }

        .search-container {
            max-width: 1400px;
            width: 100%;
            margin: 0 auto;
            display: flex;
            align-items: center;
            gap: 2rem;
        }

        .search-input-wrapper {
            flex: 1;
            position: relative;
            display: flex;
            align-items: center;
        }

        .search-input {
            width: 100%;
            height: 50px;
            border: 2px solid rgba(0, 125, 255, 0.3);
            border-radius: 25px;
            padding: 0 2rem 0 3rem;
            font-size: 1rem;
            color: var(--dark-gray);
            background: rgba(0, 125, 255, 0.05);
            transition: all 0.3s ease;
            outline: none;
        }

        .search-input:focus {
            border-color: var(--tech-blue);
            background: var(--white);
            box-shadow: 0 0 20px rgba(0, 125, 255, 0.2);
        }

        .search-input::placeholder {
            color: var(--medium-gray);
        }

        .search-icon {
            position: absolute;
            left: 1rem;
            font-size: 1.2rem;
            color: var(--tech-blue);
        }

        .search-close {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            border-radius: 50%;
            background: rgba(0, 0, 0, 0.05);
        }

        .search-close:hover {
            background: rgba(0, 125, 255, 0.1);
            transform: rotate(90deg);
        }

        .search-close i {
            font-size: 1.5rem;
            color: var(--dark-gray);
            transition: color 0.3s ease;
        }

        .search-close:hover i {
            color: var(--tech-blue);
        }

        .search-suggestions {
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: var(--white);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
            border-radius: 8px;
            margin-top: 0.5rem;
            padding: 1rem 0;
            display: none;
            z-index: 1003;
        }

        .search-suggestions.active {
            display: block;
        }

        .search-suggestion-item {
            padding: 0.8rem 2rem;
            color: var(--dark-gray);
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .search-suggestion-item:hover {
            background: rgba(0, 125, 255, 0.05);
            color: var(--tech-blue);
        }

        .search-suggestion-item i {
            font-size: 0.9rem;
            color: var(--medium-gray);
        }

        /* 移动端菜单按*/
        .mobile-menu-toggle {
            display: none;
            width: 24px;
            height: 24px;
            cursor: pointer;
            position: relative;
            z-index: 1002;
        }

        .mobile-menu-toggle span {
            display: block;
            width: 100%;
            height: 2px;
            background: var(--dark-gray);
            border-radius: 1px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: absolute;
        }

        .mobile-menu-toggle span:nth-child(1) {
            top: 6px;
        }

        .mobile-menu-toggle span:nth-child(2) {
            top: 12px;
        }

        .mobile-menu-toggle span:nth-child(3) {
            top: 18px;
        }

        .mobile-menu-toggle.active span:nth-child(1) {
            top: 12px;
            transform: rotate(45deg);
            background: var(--tech-blue);
        }

        .mobile-menu-toggle.active span:nth-child(2) {
            opacity: 0;
            transform: translateX(-10px);
        }

        .mobile-menu-toggle.active span:nth-child(3) {
            top: 12px;
            transform: rotate(-45deg);
            background: var(--tech-blue);
        }

        /* 移动端菜单面*/
        .mobile-nav-panel {
            display: none;
            position: fixed;
            top: 60px;
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--white);
            z-index: 999;
            overflow-y: auto;
            transform: translateX(100%);
            transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        .mobile-nav-content {
            padding: 2rem 5%;
        }

        .mobile-nav-item {
            border-bottom: 1px solid rgba(0, 0, 0, 0.06);
        }

        .mobile-nav-link {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.2rem 0;
            color: var(--dark-gray);
            font-size: 1rem;
            font-weight: 500;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .mobile-nav-link:hover {
            color: var(--tech-blue);
        }

        .mobile-nav-link i {
            font-size: 0.8rem;
            transition: transform 0.3s ease;
        }

        .mobile-nav-item.active .mobile-nav-link i {
            transform: rotate(180deg);
        }

        .mobile-subnav {
            display: none;
            padding: 0 1rem 1rem;
            background: rgba(0, 125, 255, 0.02);
            border-radius: 8px;
            margin-bottom: 1rem;
        }

        .mobile-nav-item.active .mobile-subnav {
            display: block;
        }

        .mobile-subnav-item {
            display: block;
            padding: 0.8rem 0;
            color: var(--medium-gray);
            font-size: 0.9rem;
            text-decoration: none;
            transition: all 0.2s ease;
        }

        .mobile-subnav-item:hover {
            color: var(--tech-blue);
            padding-left: 0.5rem;
        }

        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }