:root {
            --primary: #00ffff;
            --secondary: #ff00ff;
            --dark: #0a0a1a;
            --darker: #050510;
            --light: #ffffff;
            --gray: #a0a0c0;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: var(--dark);
            color: var(--light);
            overflow-x: hidden;
            line-height: 1.6;
        }
        
        /* 粒子背景 */
        #particles-js {
            position: fixed;
            width: 100%;
            height: 100%;
            z-index: -1;
        }
        
        /* 导航栏 */
        header {
            background-color: rgba(10, 10, 26, 0.9);
            backdrop-filter: blur(10px);
            position: fixed;
            width: 100%;
            z-index: 1000;
            padding: 1rem 2rem;
            border-bottom: 1px solid rgba(0, 255, 255, 0.2);
        }
        
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1400px;
            margin: 0 auto;
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
        }
        
        .nav-menu {
    display: flex;
    gap: 20px; /* 选项之间的间距 */
    margin-right: 20px;
}
        
        .nav-menu a {
            color: var(--light);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            position: relative;
        }
        
        .nav-menu a:hover {
            color: var(--primary);
        }
        
        .nav-menu a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: -5px;
            left: 0;
            background: var(--primary);
            transition: width 0.3s ease;
        }
        
        .nav-menu a:hover::after {
            width: 100%;
        }
        
        /* 登录按钮样式 */
        .login-btn {
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            color: var(--dark);
            padding: 0.6rem 1.5rem;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            display: inline-block;
            box-shadow: 0 5px 15px rgba(0, 255, 255, 0.3);
            border: none;
            cursor: pointer;
        }
        
        .login-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 255, 255, 0.5);
        }
        
        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        /* 登录模态框 */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            z-index: 2000;
            backdrop-filter: blur(5px);
        }
        
        .modal-content {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: var(--darker);
            padding: 3rem;
            border-radius: 15px;
            width: 90%;
            max-width: 450px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            border: 1px solid rgba(0, 255, 255, 0.2);
        }
        
        .modal-header {
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .modal-header h2 {
            font-size: 2rem;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 0.5rem;
        }
        
        .modal-header p {
            color: var(--gray);
        }
        
        .close-modal {
            position: absolute;
            top: 1rem;
            right: 1.5rem;
            font-size: 1.5rem;
            color: var(--gray);
            cursor: pointer;
            transition: color 0.3s ease;
        }
        
        .close-modal:hover {
            color: var(--primary);
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            color: var(--gray);
        }
        
        .form-control {
            width: 100%;
            padding: 0.8rem 1rem;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 5px;
            color: var(--light);
            transition: all 0.3s ease;
        }
        
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 2px rgba(0, 255, 255, 0.2);
        }
        
        .login-form-btn {
            width: 100%;
            padding: 0.8rem;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            color: var(--dark);
            border: none;
            border-radius: 5px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 1rem;
        }
        
        .login-form-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 255, 255, 0.3);
        }
        
        .form-footer {
            text-align: center;
            margin-top: 1.5rem;
            color: var(--gray);
        }
        
        .form-footer a {
            color: var(--primary);
            text-decoration: none;
        }
        
        .form-footer a:hover {
            text-decoration: underline;
        }
        
        /* 用户登录后的状态 */
        .user-menu {
            display: none;
            align-items: center;
            gap: 1rem;
        }
        
        .user-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--dark);
        }
        
        .user-name {
            color: var(--light);
            font-weight: 500;
        }
        
        .logout-btn {
            background: transparent;
            color: var(--gray);
            border: 1px solid var(--gray);
            padding: 0.4rem 1rem;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .logout-btn:hover {
            color: var(--primary);
            border-color: var(--primary);
        }
        
        /* 英雄区域 */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding: 0 2rem;
            position: relative;
            overflow: hidden;
        }
        
        .hero-content {
            max-width: 1400px;
            margin: 0 auto;
            width: 100%;
            padding-top: 5rem;
        }
        
        .hero h1 {
            font-size: 4rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            opacity: 0;
            transform: translateY(30px);
            animation: fadeUp 1s forwards 0.5s;
        }
        
        .hero p {
            font-size: 1.5rem;
            margin-bottom: 2rem;
            color: var(--gray);
            max-width: 600px;
            opacity: 0;
            transform: translateY(30px);
            animation: fadeUp 1s forwards 0.8s;
        }
        
        .hero-btns {
            display: flex;
            gap: 1rem;
            opacity: 0;
            transform: translateY(30px);
            animation: fadeUp 1s forwards 1.1s;
        }
        
        .btn {
            padding: 0.8rem 2rem;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            display: inline-block;
        }
        
        .btn-primary {
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            color: var(--dark);
            box-shadow: 0 5px 15px rgba(0, 255, 255, 0.3);
        }
        
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 255, 255, 0.5);
        }
        
        .btn-secondary {
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        
        .btn-secondary:hover {
            background-color: rgba(0, 255, 255, 0.1);
        }
        
        /* 关于我们 */
        .section {
            padding: 6rem 2rem;
            max-width: 1400px;
            margin: 0 auto;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 4rem;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            display: inline-block;
            position: relative;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            width: 100px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }
        
        .about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }
        
        .about-text h3 {
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
            color: var(--primary);
        }
        
        .about-text p {
            margin-bottom: 1.5rem;
            color: var(--gray);
        }
        
        .about-image {
            position: relative;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            transform: perspective(1000px) rotateY(-5deg);
            transition: transform 0.5s ease;
        }
        
        .about-image:hover {
            transform: perspective(1000px) rotateY(0);
        }
        
        .about-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        
        /* 服务 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        
        .service-card {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 10px;
            padding: 2rem;
            transition: all 0.3s ease;
            border: 1px solid rgba(255, 255, 255, 0.1);
            position: relative;
            overflow: hidden;
        }
        
        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
        }
        
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
            background: rgba(255, 255, 255, 0.08);
        }
        
        .service-icon {
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            color: var(--primary);
        }
        
        .service-card h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }
        
        .service-card p {
            color: var(--gray);
        }
        
        /* 科技好处部分 */
        .benefits-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: start;
        }
        
        .benefits-content {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 10px;
            padding: 2.5rem;
            border: 1px solid rgba(255, 255, 255, 0.1);
            position: relative;
        }
        
        .benefits-content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background: linear-gradient(180deg, var(--primary), var(--secondary));
        }
        
        .benefits-content h3 {
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
            color: var(--primary);
        }
        
        .benefits-content p {
            margin-bottom: 1.5rem;
            color: var(--gray);
        }
        
        /* 通告与资讯部分 */
        .announcements-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }
        
        .announcements {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 10px;
            padding: 2rem;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .announcement-item {
            padding: 1.5rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .announcement-item:last-child {
            border-bottom: none;
        }
        
        .announcement-date {
            color: var(--primary);
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
        }
        
        .announcement-title {
            font-size: 1.2rem;
            margin-bottom: 0.5rem;
        }
        
        .announcement-summary {
            color: var(--gray);
            font-size: 0.95rem;
        }
        
        /* IT小角落 */
        .it-corner {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 10px;
            padding: 2rem;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .tips-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-top: 1.5rem;
        }
        
        .tip-card {
            background: rgba(0, 0, 0, 0.2);
            border-radius: 8px;
            padding: 1.5rem;
            transition: all 0.3s ease;
            border: 1px solid rgba(255, 255, 255, 0.05);
        }
        
        .tip-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
            border-color: rgba(0, 255, 255, 0.2);
        }
        
        .tip-icon {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }
        
        .tip-card h4 {
            font-size: 1.2rem;
            margin-bottom: 0.8rem;
        }
        
        .tip-card p {
            color: var(--gray);
            font-size: 0.9rem;
        }
        
        /* 联系表单 */
        .contact-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
        }
        
        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        
        .contact-item {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .contact-icon {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
        }
        
        .contact-form {
            background: rgba(255, 255, 255, 0.05);
            padding: 2rem;
            border-radius: 10px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        /* 页脚 */
        footer {
            background-color: var(--darker);
            padding: 4rem 2rem 2rem;
            border-top: 1px solid rgba(0, 255, 255, 0.2);
        }
        
        .footer-content {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 3rem;
        }
        
        .footer-column h3 {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            position: relative;
            display: inline-block;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            width: 40px;
            height: 2px;
            background: var(--primary);
            bottom: -5px;
            left: 0;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        
        .footer-links a {
            color: var(--gray);
            text-decoration: none;
            transition: all 0.3s ease;
        }
        
        .footer-links a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        
        .social-links {
            display: flex;
            gap: 1rem;
            margin-top: 1.5rem;
        }
        
        .social-link {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--light);
            text-decoration: none;
            transition: all 0.3s ease;
        }
        
        .social-link:hover {
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            transform: translateY(-3px);
        }
        
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: var(--gray);
            font-size: 0.9rem;
        }
        
        /* 动画 */
        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s ease;
        }
        
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .about-content, .contact-container, .benefits-container, .announcements-container {
                grid-template-columns: 1fr;
            }
            
            .hero h1 {
                font-size: 3rem;
            }
            
            .hero p {
                font-size: 1.2rem;
            }
        }
        
        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: 70px;
                right: -100%;
                flex-direction: column;
                background: var(--darker);
                width: 80%;
                height: calc(100vh - 70px);
                padding: 2rem;
                transition: right 0.3s ease;
                border-left: 1px solid rgba(0, 255, 255, 0.2);
            }
            
            .nav-menu.active {
                right: 0;
            }
            
            .mobile-toggle {
                display: block;
            }
            
            .hero h1 {
                font-size: 2.5rem;
            }
            
            .hero-btns {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .btn {
                width: 100%;
                text-align: center;
            }
            
            .user-menu {
                flex-direction: column;
                gap: 0.5rem;
            }
        }
        
        @media (max-width: 576px) {
            .section {
                padding: 4rem 1rem;
            }
            
            .hero {
                padding: 0 1rem;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            .hero p {
                font-size: 1rem;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
            
            .modal-content {
                padding: 2rem 1.5rem;
            }
        }

        /* --- 联系方式 Section (透明背景 + 白色卡片) --- */

#contact-light {
    font-family: sans-serif;
    text-align: center;
    padding: 60px 20px;
    background-color: transparent; /* 关键改动: 背景设置为透明 */
}

.title-container {
    margin-bottom: 50px;
}

.title-container h2 {
    font-size: 32px;
    margin-bottom: 10px;
    position: relative;
    padding-bottom: 15px;
    color: #ffffff; /* 关键改动: 标题文字改为白色 */
}

/* 标题下面的装饰线 */
.title-container h2::after {
    content: '';
    position: absolute;
    display: block;
    width: 50px;
    height: 3px;
    background: #8A63D2; /* 装饰线颜色，可以根据你的主题调整 */
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.title-container p {
    color: #dddddd; /* 关键改动: 副标题文字改为浅灰色 */
}

/* Flexbox 容器 */
.contact-cards-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap; 
}

/* 白色卡片样式 (这部分保持不变) */
.contact-card {
    background: transparent;;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    width: 370px;
    color: white; /* 确保卡片内的文字是深色的 */
    
}

.card-icon {
    margin: 0 auto 20px auto;
    width: 64px;
    height: 64px;
    background: #f3f0ff; 
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon i {
    font-size: 28px;
    color: #8A63D2; 
}

.contact-card h3 {
    margin-bottom: 15px;
    font-size: 20px;
}

.contact-card p {
    color: white;
    line-height: 1.6;
}


/* --- 下拉菜单样式 --- */

/* 1. 给包含下拉菜单的父级li添加相对定位 */
.nav-menu .dropdown {
    position: relative; 
}

/* 2. 默认隐藏下拉菜单，并设置样式 */
.dropdown-menu {
    display: none; /* 默认隐藏 */
    position: absolute; /* 绝对定位，相对于父级li */
    top: 100%; /* 从父级元素的底部开始显示 */
    left: 0;
    background-color: white;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    border-radius: 8px;
    padding: 10px 0;
    list-style: none; /* 移除默认的列表点 */
    min-width: 180px; /* 设置一个最小宽度 */
    z-index: 1000; /* 确保它显示在其他内容的上方 */
}

/* 3. 设置下拉菜单中每个链接的样式 */
.dropdown-menu li a {
    color: #333; /* 链接文字颜色 */
    padding: 12px 20px;
    display: block; /* 让链接填满整个li的宽度 */
    text-decoration: none;
    white-space: nowrap; /* 防止文字换行 */
    transition: background-color 0.2s; /* 添加一个平滑的过渡效果 */
}

/* 4. 设置鼠标悬停在下拉菜单链接上的效果 */
.dropdown-menu li a:hover {
    background-color: #f5f5f5; /* 悬停时背景变灰 */
}

/* 5. 核心：当鼠标悬停在父级li上时，显示下拉菜单 */
.dropdown:hover .dropdown-menu {
    display: block; /* 显示下拉菜单 */
}

/* (可选) 调整服务旁边的下拉小箭头 */
.dropdown a .fa-chevron-down {
    font-size: 0.8em; /* 让箭头小一点 */
    margin-left: 5px;
}

.nav-menu {
    margin-left: auto; /* ✅ 把菜单整体推到右边 */
}

.login-btn {
    margin-left: 20px; /* 菜单和按钮之间留一点空隙 */
}