:root {
            --primary-color: #1a365d;
            --secondary-color: #e63946;
            --accent-color: #f8b500;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --text-color: #333333;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-padding {
            padding-top: 80px;
            padding-bottom: 80px;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding-top: 60px;
                padding-bottom: 60px;
            }
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            padding-top: 15px;
            padding-bottom: 15px;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color);
            margin: 0 8px;
            transition: var(--transition);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1492684223066-dd23140edf6d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 160px 0 120px;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 25px;
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 40px;
            opacity: 0.9;
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #d32f3c;
            border-color: #d32f3c;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        .service-card {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 30px;
            height: 100%;
            transition: var(--transition);
            border-top: 4px solid transparent;
        }
        .service-card:hover {
            transform: translateY(-10px);
            border-top-color: var(--secondary-color);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background-color: rgba(26, 54, 93, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .project-card {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            margin-bottom: 30px;
            transition: var(--transition);
        }
        .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .project-img {
            height: 250px;
            object-fit: cover;
            width: 100%;
        }
        .project-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(26, 54, 93, 0.85);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: var(--transition);
        }
        .project-card:hover .project-overlay {
            opacity: 1;
        }
        .stats-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, #2d4a7c 100%);
            color: white;
        }
        .stat-item {
            text-align: center;
            padding: 30px 15px;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--accent-color);
            margin-bottom: 10px;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 8px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            color: var(--primary-color);
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none;
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
            color: var(--secondary-color);
        }
        .footer {
            background-color: var(--primary-color);
            color: rgba(255, 255, 255, 0.8);
            padding-top: 80px;
            padding-bottom: 40px;
        }
        .footer h5 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.2rem;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 25px;
            margin-top: 50px;
            text-align: center;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
        }
        @media (max-width: 992px) {
            .hero-title {
                font-size: 2.8rem;
            }
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.3rem;
            }
            .hero-section {
                padding: 120px 0 80px;
            }
            .section-padding {
                padding-top: 50px;
                padding-bottom: 50px;
            }
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
            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(--primary-color);
            transform: translateY(-5px);
        }