:root {
            --primary-color: #1a365d;
            --secondary-color: #2d74da;
            --accent-color: #f0b52d;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --transition: all 0.3s ease;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        .navbar {
            background-color: rgba(26, 54, 93, 0.95);
            padding-top: 0.8rem;
            padding-bottom: 0.8rem;
            transition: var(--transition);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: white !important;
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .nav-link {
            color: rgba(255,255,255,0.85) !important;
            font-weight: 500;
            margin: 0 0.5rem;
            padding: 0.5rem 1rem !important;
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-link:hover, .nav-link.active {
            color: white !important;
            background-color: rgba(45, 116, 218, 0.2);
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, #2a4365 100%);
            color: white;
            padding: 6rem 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMjgwIDE0MCI+PHBhdGggZmlsbD0iIzFhMzY1ZCIgZmlsbC1vcGFjaXR5PSIwLjEiIGQ9Ik0wIDUybDY0MCA4OEwxMjgwIDB2MTQwSDBWNzJ6Ii8+PC9zdmc+') no-repeat bottom;
            background-size: cover;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .hero-subtitle {
            font-size: 1.4rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
            max-width: 700px;
        }
        .btn-primary-custom {
            background-color: var(--accent-color);
            border: none;
            color: var(--primary-color);
            font-weight: 600;
            padding: 0.8rem 2.5rem;
            border-radius: 50px;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(240, 181, 45, 0.3);
        }
        .btn-primary-custom:hover {
            background-color: #ffc107;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(240, 181, 45, 0.5);
            color: var(--primary-color);
        }
        .section-title {
            color: var(--primary-color);
            font-weight: 700;
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--accent-color);
            border-radius: 2px;
        }
        .service-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            background-color: white;
        }
        .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(--secondary-color), #1a365d);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: -35px auto 20px;
            color: white;
            font-size: 1.8rem;
            box-shadow: 0 5px 15px rgba(45, 116, 218, 0.3);
        }
        .card-title {
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .stats-section {
            background-color: #f8f9fa;
            padding: 5rem 0;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stat-label {
            color: var(--secondary-color);
            font-weight: 600;
            text-transform: uppercase;
            font-size: 0.9rem;
            letter-spacing: 1px;
        }
        .case-study-card {
            border-radius: 12px;
            overflow: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
            background-color: white;
        }
        .case-study-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .case-study-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .news-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .news-date {
            background-color: var(--primary-color);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 50px;
            font-size: 0.9rem;
            display: inline-block;
            margin-bottom: 1rem;
        }
        .contact-section {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            padding: 5rem 0;
        }
        .contact-info-box {
            background-color: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
            height: 100%;
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background-color: rgba(45, 116, 218, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--secondary-color);
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .form-control-custom {
            border: 1px solid #dee2e6;
            border-radius: 8px;
            padding: 0.8rem 1.2rem;
            transition: var(--transition);
        }
        .form-control-custom:focus {
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 0.25rem rgba(45, 116, 218, 0.25);
        }
        footer {
            background-color: var(--primary-color);
            color: rgba(255,255,255,0.8);
            padding-top: 4rem;
        }
        .footer-title {
            color: white;
            font-weight: 600;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background-color: var(--accent-color);
        }
        .footer-links a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            display: block;
            margin-bottom: 0.8rem;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        .copyright {
            background-color: rgba(0,0,0,0.2);
            padding: 1.5rem 0;
            margin-top: 3rem;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 0.8rem 1.8rem;
            border-radius: 50px;
            margin: 0.5rem;
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            border: 1px solid #e9ecef;
        }
        .flink:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            color: var(--secondary-color);
            border-color: var(--secondary-color);
        }
        .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;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
            box-shadow: 0 3px 10px rgba(45, 116, 218, 0.3);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stat-number {
                font-size: 2.8rem;
            }
        }