:root {
            --primary-color: #0056b3;
            --secondary-color: #28a745;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --accent-color: #ffc107;
            --transition-speed: 0.3s;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--dark-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            transition: all var(--transition-speed);
            padding-top: 0.8rem;
            padding-bottom: 0.8rem;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            padding: 0.5rem 1.2rem !important;
            color: var(--dark-color) !important;
            transition: color var(--transition-speed);
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%) scaleX(0);
            width: 70%;
            height: 3px;
            background-color: var(--primary-color);
            transition: transform var(--transition-speed);
        }
        .nav-link:hover::after, .nav-link.active::after {
            transform: translateX(-50%) scaleX(1);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 84, 179, 0.85), rgba(40, 167, 69, 0.8)), url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-4.0.3&auto=format&fit=crop&w=2072&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all var(--transition-speed);
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 86, 179, 0.3);
        }
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
            padding-bottom: 1rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        .service-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: transform var(--transition-speed), box-shadow var(--transition-speed);
            height: 100%;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            display: inline-block;
            transition: transform var(--transition-speed);
        }
        .service-card:hover .service-icon {
            transform: scale(1.2);
        }
        .card-title {
            color: var(--primary-color);
            font-weight: 700;
        }
        .feature-box {
            padding: 2.5rem;
            border-radius: 15px;
            background-color: white;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
            height: 100%;
            transition: transform var(--transition-speed);
            border-left: 5px solid var(--primary-color);
        }
        .feature-box:hover {
            transform: translateY(-8px);
        }
        .stats-section {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 5rem 0;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 0.5rem;
        }
        .case-study-img {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-img {
            width: 180px;
            height: 180px;
            object-fit: cover;
            border-radius: 50%;
            margin-bottom: 1.5rem;
            border: 5px solid var(--light-color);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
            transition: transform var(--transition-speed);
        }
        .team-member:hover .team-img {
            transform: scale(1.05);
        }
        .contact-info-box {
            background-color: var(--light-color);
            padding: 2rem;
            border-radius: 15px;
            height: 100%;
            border-left: 5px solid var(--secondary-color);
        }
        .contact-icon {
            font-size: 2rem;
            color: var(--secondary-color);
            margin-bottom: 1rem;
        }
        .friendlink {
            background-color: #f9f9f9;
            padding: 4rem 0;
        }
        .flink {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 1rem 2rem;
            margin: 0.5rem;
            background-color: white;
            border-radius: 10px;
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 600;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            transition: all var(--transition-speed);
            border: 2px solid transparent;
        }
        .flink:hover {
            border-color: var(--primary-color);
            color: var(--primary-color);
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }
        footer {
            background-color: var(--dark-color);
            color: #ddd;
            padding-top: 4rem;
        }
        footer a {
            color: #ddd;
            text-decoration: none;
            transition: color var(--transition-speed);
        }
        footer a:hover {
            color: white;
        }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.1);
            margin-right: 0.8rem;
            transition: all var(--transition-speed);
        }
        .social-links a:hover {
            background-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;
            font-size: 1.5rem;
            text-decoration: none;
            box-shadow: 0 5px 15px rgba(0, 86, 179, 0.4);
            opacity: 0;
            visibility: hidden;
            transition: all var(--transition-speed);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #004494;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }