:root {
            --primary-blue: #0d6efd;
            --secondary-dark: #2c3e50;
            --accent-green: #20c997;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
        }
        .navbar-brand span {
            color: var(--primary-blue);
        }
        .hero-section {
            background: linear-gradient(rgba(13, 110, 253, 0.85), rgba(44, 62, 80, 0.9)), url('https://images.unsplash.com/photo-1497366754035-f200968a6e72?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-green);
        }
        .service-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: transform 0.4s ease, box-shadow 0.4s ease;
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--primary-blue);
            margin-bottom: 1.5rem;
        }
        .case-study-img {
            height: 250px;
            object-fit: cover;
            border-radius: 10px;
        }
        .news-card {
            border-left: 5px solid var(--primary-blue);
            transition: all 0.3s ease;
        }
        .news-card:hover {
            background-color: var(--light-bg);
            transform: translateX(5px);
        }
        .contact-info-box {
            background: var(--light-bg);
            border-radius: 15px;
            padding: 2rem;
            text-align: center;
            transition: background 0.3s ease;
        }
        .contact-info-box:hover {
            background: #e9ecef;
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--primary-blue);
            margin-bottom: 1rem;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px;
            background: var(--light-bg);
            border-radius: 30px;
            text-decoration: none;
            color: var(--dark-text);
            transition: all 0.3s ease;
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--primary-blue);
            color: white;
            transform: scale(1.05);
        }
        footer {
            background-color: var(--secondary-dark);
            color: #adb5bd;
        }
        .footer-link {
            color: #adb5bd;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer-link:hover {
            color: white;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-blue);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.show {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
                text-align: center;
            }
            .section-title:after {
                left: 0;
                transform: none;
            }
        }