:root {
            --primary-color: #1a365d;
            --secondary-color: #e53e3e;
            --accent-color: #f6ad55;
            --light-color: #f7fafc;
            --dark-color: #2d3748;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.8;
            color: var(--dark-color);
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            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(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            padding: 10rem 0 6rem;
            color: white;
        }
        .section-title {
            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: var(--secondary-color);
            border-radius: 2px;
        }
        .card-hover {
            transition: var(--transition);
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px 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 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .btn-custom {
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            border: none;
            color: white;
            padding: 0.75rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
            color: white;
        }
        .portfolio-item {
            position: relative;
            overflow: hidden;
            border-radius: 10px;
            margin-bottom: 30px;
        }
        .portfolio-img {
            transition: var(--transition);
            width: 100%;
            height: 300px;
            object-fit: cover;
        }
        .portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(26, 54, 93, 0.85);
            color: white;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            opacity: 0;
            transition: var(--transition);
            padding: 2rem;
        }
        .portfolio-item:hover .portfolio-overlay {
            opacity: 1;
        }
        .portfolio-item:hover .portfolio-img {
            transform: scale(1.1);
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: var(--transition);
            height: 60px;
            object-fit: contain;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1.5rem;
            margin: 0.5rem;
            background: var(--light-color);
            border-radius: 50px;
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #e2e8f0;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .footer {
            background: var(--primary-color);
            color: white;
            padding-top: 4rem;
        }
        .footer a {
            color: #cbd5e0;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 7rem 0 4rem;
            }
            .display-4 {
                font-size: 2.5rem;
            }
        }
        .article-content {
            max-width: 900px;
            margin: 0 auto;
        }
        .timeline {
            position: relative;
            padding-left: 2rem;
            border-left: 3px solid var(--primary-color);
            margin-left: 1rem;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -2.5rem;
            top: 0.5rem;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--secondary-color);
        }