:root {
            --primary-color: #1a56db;
            --secondary-color: #0e9f6e;
            --dark-color: #1f2937;
            --light-color: #f9fafb;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: #333;
            overflow-x: hidden;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            padding: 15px 0;
            transition: var(--transition);
        }
        .navbar.scrolled {
            padding: 10px 0;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, #2d6bcc 100%);
            color: white;
            padding: 120px 0 100px;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('https://images.unsplash.com/photo-1558494949-ef010cbdcc31?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1470&q=80') center/cover no-repeat;
            opacity: 0.1;
        }
        .section-title {
            position: relative;
            margin-bottom: 50px;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
        }
        .service-card {
            background: white;
            border-radius: 10px;
            padding: 30px;
            height: 100%;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            border: 1px solid #eee;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color) 0%, #2d6bcc 100%);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }
        .stats-section {
            background-color: var(--light-color);
            padding: 80px 0;
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        .project-card {
            position: relative;
            border-radius: 10px;
            overflow: hidden;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
        }
        .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .project-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(26, 86, 219, 0.9);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            opacity: 0;
            transition: var(--transition);
            padding: 20px;
            text-align: center;
            color: white;
        }
        .project-card:hover .project-overlay {
            opacity: 1;
        }
        .team-member {
            text-align: center;
            margin-bottom: 30px;
        }
        .team-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 20px;
            border: 5px solid #f1f5f9;
        }
        .contact-form .form-control {
            padding: 12px 15px;
            border-radius: 5px;
            border: 1px solid #ddd;
            margin-bottom: 20px;
        }
        .contact-form .form-control:focus {
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.2);
            border-color: var(--primary-color);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            border-radius: 5px;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #1546b3;
            border-color: #1546b3;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(26, 86, 219, 0.3);
        }
        .footer {
            background-color: var(--dark-color);
            color: #fff;
            padding: 70px 0 20px;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .social-links a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 10px;
        }
        .social-links a:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .friendlink {
            background-color: #f8fafc;
            padding: 50px 0;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background-color: white;
            border-radius: 5px;
            border: 1px solid #e5e7eb;
            color: #4b5563;
            text-decoration: none;
            transition: var(--transition);
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #1546b3;
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0 60px;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }