:root {
            --primary-color: #1a3a8f;
            --secondary-color: #00a8e8;
            --accent-color: #ff6b35;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            padding: 1rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            margin: 0 0.5rem;
            transition: var(--transition);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 58, 143, 0.9) 0%, rgba(0, 168, 232, 0.85) 100%), url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-4.0.3&auto=format&fit=crop&w=2072&q=80') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 10rem 0;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }
        .hero-subtitle {
            font-size: 1.5rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
        }
        .btn-primary {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
            padding: 0.8rem 2.5rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #e05a2b;
            border-color: #e05a2b;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .section-padding {
            padding: 6rem 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .service-card {
            background-color: white;
            border-radius: 12px;
            padding: 2.5rem 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: var(--transition);
            border-top: 5px solid transparent;
        }
        .service-card:hover {
            transform: translateY(-10px);
            border-top: 5px solid var(--secondary-color);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .about-img {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
        }
        .feature-list li {
            margin-bottom: 1rem;
            padding-left: 2rem;
            position: relative;
        }
        .feature-list li:before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--accent-color);
            font-weight: bold;
        }
        .project-card {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
        }
        .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
        }
        .project-img {
            height: 250px;
            object-fit: cover;
            width: 100%;
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-img {
            width: 180px;
            height: 180px;
            object-fit: cover;
            border-radius: 50%;
            margin: 0 auto 1.5rem;
            border: 5px solid var(--light-color);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .testimonial-card {
            background-color: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            position: relative;
            margin-top: 3rem;
        }
        .testimonial-card:before {
            content: '\f10d';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            top: -25px;
            left: 30px;
            font-size: 3rem;
            color: var(--secondary-color);
            background-color: white;
            padding: 0 1rem;
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.6;
            transition: var(--transition);
            height: 60px;
            object-fit: contain;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .contact-info-box {
            background-color: var(--light-color);
            border-radius: 12px;
            padding: 2.5rem;
            height: 100%;
            text-align: center;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            background-color: white;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        footer {
            background-color: #1a2332;
            color: rgba(255, 255, 255, 0.8);
            padding-top: 4rem;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-links ul {
            padding-left: 0;
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .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;
            color: white;
            transition: var(--transition);
        }
        .social-links a:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 1.5rem 0;
            margin-top: 3rem;
            font-size: 0.9rem;
        }
        .friendlink {
            background-color: rgba(255, 255, 255, 0.05);
            border-radius: 8px;
            padding: 2rem;
            margin-top: 3rem;
        }
        .flink {
            display: inline-block;
            background-color: rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.8);
            padding: 0.6rem 1.2rem;
            border-radius: 30px;
            margin: 0.5rem;
            text-decoration: none;
            transition: var(--transition);
            font-size: 0.9rem;
        }
        .flink:hover {
            background-color: var(--secondary-color);
            color: white;
            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%;
            text-align: center;
            line-height: 50px;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--accent-color);
            transform: translateY(-5px);
        }
        @media (max-width: 992px) {
            .hero-title {
                font-size: 2.8rem;
            }
            .section-padding {
                padding: 4rem 0;
            }
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.3rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
        }