:root {
            --primary-color: #0d6efd;
            --secondary-color: #1e3a8a;
            --accent-color: #10b981;
            --dark-color: #1f2937;
            --light-color: #f8f9fa;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.8;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(13, 110, 253, 0.9) 0%, rgba(30, 58, 138, 0.9) 100%), url('https://images.unsplash.com/photo-1558494949-ef010cbdcc31?ixlib=rb-4.0.3&auto=format&fit=crop&w=1470&q=80') center/cover no-repeat;
            padding: 180px 0 120px;
            color: white;
            position: relative;
        }
        .section-title {
            position: relative;
            padding-bottom: 20px;
            margin-bottom: 50px;
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
            border-radius: 2px;
        }
        .service-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: all 0.3s ease;
            height: 100%;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
        }
        .service-card:hover {
            transform: translateY(-15px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: white;
            font-size: 2rem;
        }
        .case-study-item {
            position: relative;
            border-radius: 12px;
            overflow: hidden;
            height: 300px;
            cursor: pointer;
        }
        .case-study-item img {
            transition: transform 0.5s ease;
            height: 100%;
            object-fit: cover;
        }
        .case-study-item:hover img {
            transform: scale(1.1);
        }
        .case-study-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0, 0, 0, 0.9));
            padding: 30px;
            color: white;
            transform: translateY(20px);
            transition: transform 0.3s ease;
        }
        .case-study-item:hover .case-study-overlay {
            transform: translateY(0);
        }
        .team-member {
            text-align: center;
            margin-bottom: 40px;
        }
        .team-member img {
            width: 200px;
            height: 200px;
            object-fit: cover;
            border-radius: 50%;
            border: 5px solid var(--light-color);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            margin-bottom: 20px;
            transition: transform 0.3s ease;
        }
        .team-member:hover img {
            transform: scale(1.05);
        }
        .contact-info-item {
            background: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            text-align: center;
            height: 100%;
            transition: transform 0.3s ease;
        }
        .contact-info-item:hover {
            transform: translateY(-10px);
        }
        .contact-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 1.8rem;
        }
        .flink {
            display: inline-block;
            padding: 12px 25px;
            margin: 8px;
            background: white;
            border-radius: 8px;
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            border: 2px solid #e5e7eb;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-5px);
        }
        footer {
            background: var(--dark-color);
            color: white;
            padding-top: 80px;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 25px;
            font-weight: 600;
        }
        .footer-links a {
            color: #d1d5db;
            text-decoration: none;
            display: block;
            margin-bottom: 12px;
            transition: color 0.3s ease;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid #374151;
            padding: 25px 0;
            margin-top: 60px;
            text-align: center;
            color: #9ca3af;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 1.5rem;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 120px 0 80px;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .team-member img {
                width: 150px;
                height: 150px;
            }
        }