:root {
            --primary-color: #2c5aa0;
            --secondary-color: #f8f9fa;
            --accent-color: #ff6b35;
            --text-dark: #333;
            --text-light: #666;
            --transition-speed: 0.3s;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            padding: 1rem 0;
            transition: all var(--transition-speed);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-dark) !important;
            margin: 0 0.5rem;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--accent-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--accent-color);
            transition: width var(--transition-speed);
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(44, 90, 160, 0.85), rgba(44, 90, 160, 0.9)), url('https://images.unsplash.com/photo-1519389950473-47ba0277781c?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1770&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0;
            text-align: center;
        }
        .hero-title {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            color: white;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }
        .section-padding {
            padding: 5rem 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background-color: var(--accent-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .service-card {
            border: none;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: transform var(--transition-speed), box-shadow var(--transition-speed);
            height: 100%;
            overflow: hidden;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), #3a7bd5);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .case-study-item {
            position: relative;
            border-radius: 12px;
            overflow: hidden;
            margin-bottom: 2rem;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }
        .case-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
            color: white;
            padding: 2rem;
            transform: translateY(100%);
            transition: transform var(--transition-speed);
        }
        .case-study-item:hover .case-overlay {
            transform: translateY(0);
        }
        .contact-info-box {
            background-color: var(--secondary-color);
            border-radius: 12px;
            padding: 2.5rem;
            height: 100%;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
            transition: transform var(--transition-speed);
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .flink {
            display: inline-block;
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            background-color: var(--secondary-color);
            border-radius: 8px;
            color: var(--text-dark);
            text-decoration: none;
            font-weight: 600;
            transition: all var(--transition-speed);
            border: 1px solid #eaeaea;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            border-color: var(--primary-color);
        }
        .friendlink {
            background-color: #f8f9fa;
            border-top: 1px solid #eee;
            border-bottom: 1px solid #eee;
        }
        .footer {
            background-color: #1a2b4c;
            color: #aaa;
            padding: 4rem 0 2rem;
        }
        .footer a {
            color: #ccc;
            text-decoration: none;
            transition: color var(--transition-speed);
        }
        .footer a:hover {
            color: white;
        }
        .footer-title {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            width: 50px;
            height: 3px;
            background-color: var(--accent-color);
            bottom: 0;
            left: 0;
        }
        .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: 1.2rem;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all var(--transition-speed);
            z-index: 999;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--accent-color);
            color: white;
        }
        .article-content {
            text-align: justify;
            hyphens: auto;
        }
        .article-content p {
            margin-bottom: 1.5rem;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
            .navbar-nav {
                text-align: center;
                padding-top: 1rem;
            }
        }