:root {
            --primary-color: #1a365d;
            --secondary-color: #0ea5e9;
            --accent-color: #10b981;
            --text-dark: #1e293b;
            --text-light: #64748b;
            --light-bg: #f8fafc;
            --border-color: #e2e8f0;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
            border-radius: 2px;
        }
        .text-gradient {
            background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border: none;
            padding: 12px 28px;
            border-radius: 6px;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: var(--shadow);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
            background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
        }
        .btn-outline-primary {
            border: 2px solid var(--secondary-color);
            color: var(--secondary-color);
            background: transparent;
            padding: 10px 26px;
            border-radius: 6px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-outline-primary:hover {
            background-color: var(--secondary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
            padding: 15px 0;
            transition: all 0.3s ease;
        }
        .navbar.scrolled {
            padding: 10px 0;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-dark);
            margin: 0 10px;
            position: relative;
            transition: color 0.3s;
        }
        .nav-link:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary-color);
            transition: width 0.3s ease;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color);
        }
        .nav-link:hover:after, .nav-link.active:after {
            width: 100%;
        }
        .hero {
            padding: 120px 0 80px;
            background: linear-gradient(rgba(26, 54, 93, 0.9), rgba(14, 165, 233, 0.8)), url('https://images.unsplash.com/photo-1516321318423-f06f85e504b3?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            position: relative;
            overflow: hidden;
        }
        .hero h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
        }
        .hero p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .hero .btn-primary {
            background: white;
            color: var(--primary-color);
        }
        .hero .btn-primary:hover {
            background: var(--light-bg);
            color: var(--primary-color);
        }
        .hero .btn-outline-primary {
            border-color: white;
            color: white;
        }
        .hero .btn-outline-primary:hover {
            background-color: white;
            color: var(--primary-color);
        }
        .feature-card {
            background: white;
            border-radius: 12px;
            padding: 2.5rem 2rem;
            height: 100%;
            box-shadow: var(--shadow);
            transition: all 0.4s ease;
            border: 1px solid var(--border-color);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
            border-color: var(--secondary-color);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .about-section {
            padding: 100px 0;
            background-color: var(--light-bg);
        }
        .about-img {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .stats-box {
            background: white;
            border-radius: 10px;
            padding: 2rem;
            text-align: center;
            box-shadow: var(--shadow);
            border-top: 4px solid var(--secondary-color);
            transition: transform 0.3s ease;
        }
        .stats-box:hover {
            transform: translateY(-5px);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--secondary-color);
            line-height: 1;
        }
        .services-section {
            padding: 100px 0;
        }
        .service-card {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            height: 100%;
            box-shadow: var(--shadow);
            transition: all 0.4s ease;
            border: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }
        .service-card:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }
        .service-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .projects-section {
            padding: 100px 0;
            background-color: var(--light-bg);
        }
        .project-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all 0.4s ease;
            height: 100%;
        }
        .project-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }
        .project-img {
            height: 220px;
            width: 100%;
            object-fit: cover;
        }
        .project-content {
            padding: 1.8rem;
        }
        .project-tag {
            display: inline-block;
            background-color: rgba(14, 165, 233, 0.1);
            color: var(--secondary-color);
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }
        .team-section {
            padding: 100px 0;
        }
        .team-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all 0.4s ease;
            height: 100%;
        }
        .team-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }
        .team-img {
            height: 280px;
            width: 100%;
            object-fit: cover;
        }
        .team-content {
            padding: 1.8rem;
            text-align: center;
        }
        .team-position {
            color: var(--secondary-color);
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        .testimonials-section {
            padding: 100px 0;
            background-color: var(--light-bg);
        }
        .testimonial-card {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: var(--shadow);
            position: relative;
            height: 100%;
        }
        .testimonial-card:before {
            content: "\201C";
            font-size: 6rem;
            color: rgba(14, 165, 233, 0.1);
            position: absolute;
            top: -20px;
            left: 20px;
            font-family: Georgia, serif;
        }
        .testimonial-text {
            font-style: italic;
            margin-bottom: 1.5rem;
            position: relative;
            z-index: 1;
        }
        .testimonial-author {
            display: flex;
            align-items: center;
        }
        .testimonial-author-img {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            margin-right: 15px;
        }
        .contact-section {
            padding: 100px 0;
        }
        .contact-info-box {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: var(--shadow);
            height: 100%;
            text-align: center;
            border-top: 4px solid var(--secondary-color);
        }
        .contact-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .contact-form {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: var(--shadow);
        }
        .form-control {
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 1.5rem;
            transition: all 0.3s;
        }
        .form-control:focus {
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 0.25rem rgba(14, 165, 233, 0.25);
        }
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 80px 0 30px;
        }
        .footer h5 {
            color: white;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 10px;
        }
        .footer h5:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background-color: var(--secondary-color);
        }
        .footer-links {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: all 0.3s;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 25px;
            margin-top: 60px;
            text-align: center;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: white;
            margin-right: 10px;
            transition: all 0.3s;
        }
        .social-icons a:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        .friendlink {
            background-color: var(--light-bg);
            padding: 60px 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 12px 24px;
            border-radius: 8px;
            margin: 8px;
            color: var(--text-dark);
            text-decoration: none;
            font-weight: 600;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
            border: 1px solid var(--border-color);
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            color: var(--secondary-color);
            border-color: var(--secondary-color);
        }
        @media (max-width: 992px) {
            .hero h1 {
                font-size: 2.8rem;
            }
            .section-title {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .hero {
                padding: 100px 0 60px;
            }
            .hero h1 {
                font-size: 2.3rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .feature-card, .service-card, .project-card, .team-card, .testimonial-card {
                margin-bottom: 30px;
            }
        }
        @media (max-width: 576px) {
            .hero h1 {
                font-size: 2rem;
            }
            .stats-number {
                font-size: 2.5rem;
            }
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-in-up {
            animation: fadeInUp 0.6s ease forwards;
        }
        .stagger-animation > * {
            opacity: 0;
        }
        .progress-container {
            width: 100%;
            height: 4px;
            background: transparent;
            position: fixed;
            top: 0;
            left: 0;
            z-index: 9999;
        }
        .progress-bar {
            height: 4px;
            background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
            width: 0%;
            transition: width 0.3s ease;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            box-shadow: var(--shadow);
            z-index: 99;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }