:root {
            --primary-blue: #0d6efd;
            --dark-blue: #084298;
            --light-blue: #cfe2ff;
            --primary-gray: #6c757d;
            --dark-gray: #343a40;
            --light-gray: #f8f9fa;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Helvetica Neue', 'Segoe UI', Arial, 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-gray);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            background: linear-gradient(90deg, var(--primary-blue), var(--dark-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            padding: 0.5rem 1.2rem !important;
            transition: var(--transition);
            border-radius: 4px;
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            background-color: var(--light-blue);
            color: var(--primary-blue) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(13, 110, 253, 0.85), rgba(8, 66, 152, 0.9)), url('https://images.unsplash.com/photo-1450101499163-c8848c66ca85?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            padding: 10rem 0;
            color: white;
        }
        .hero-title {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-primary {
            background: linear-gradient(90deg, var(--primary-blue), var(--dark-blue));
            border: none;
            padding: 0.8rem 2.5rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(13, 110, 253, 0.3);
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-blue), var(--dark-blue));
            border-radius: 2px;
        }
        .card-hover {
            transition: var(--transition);
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(13, 110, 253, 0.15);
        }
        .icon-wrapper {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--light-blue), white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 2.5rem;
            color: var(--primary-blue);
        }
        .service-card .icon-wrapper {
            background: linear-gradient(135deg, #d4edda, white);
            color: #198754;
        }
        .product-card .icon-wrapper {
            background: linear-gradient(135deg, #fff3cd, white);
            color: #fd7e14;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: var(--light-blue);
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--primary-blue);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--light-blue);
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: var(--transition);
            max-height: 60px;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .form-control, .form-select {
            border: 1px solid #dee2e6;
            padding: 0.8rem;
            border-radius: 8px;
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
        }
        .footer {
            background-color: var(--dark-gray);
            color: #dee2e6;
            padding-top: 3rem;
        }
        .footer a {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
        }
        .flink {
            display: inline-block;
            background: var(--light-gray);
            color: var(--dark-gray);
            padding: 0.5rem 1.2rem;
            margin: 0.3rem;
            border-radius: 50px;
            font-size: 0.9rem;
            transition: var(--transition);
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--primary-blue);
            color: white;
            border-color: var(--primary-blue);
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 6rem 0;
            }
        }