:root {
            --primary-blue: #0056b3;
            --secondary-blue: #0d6efd;
            --dark-blue: #003d82;
            --light-blue: #e8f4ff;
            --accent-orange: #ff6b35;
            --text-dark: #333;
            --text-light: #666;
            --bg-light: #f8f9fa;
            --border-color: #dee2e6;
            --shadow-light: rgba(0, 86, 179, 0.1);
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-blue);
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: all 0.3s ease;
        }
        a:hover {
            color: var(--accent-orange);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 15px var(--shadow-light);
            padding-top: 0.8rem;
            padding-bottom: 0.8rem;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-blue) !important;
        }
        .navbar-brand span {
            color: var(--accent-orange);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 0.5rem;
            position: relative;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--accent-orange);
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 80%;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--light-blue) 0%, #ffffff 100%);
            padding: 6rem 0 4rem;
            position: relative;
            overflow: hidden;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            color: var(--dark-blue);
        }
        .hero-subtitle {
            font-size: 1.2rem;
            color: var(--text-light);
            margin-bottom: 2rem;
        }
        .btn-primary {
            background-color: var(--primary-blue);
            border-color: var(--primary-blue);
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: var(--dark-blue);
            border-color: var(--dark-blue);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px var(--shadow-light);
        }
        .btn-outline-primary {
            color: var(--primary-blue);
            border-color: var(--primary-blue);
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 8px;
        }
        .btn-outline-primary:hover {
            background-color: var(--primary-blue);
            border-color: var(--primary-blue);
            transform: translateY(-3px);
        }
        .section-padding {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        .section-title {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            position: relative;
            display: inline-block;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background-color: var(--accent-orange);
        }
        .section-subtitle {
            color: var(--text-light);
            font-size: 1.1rem;
            margin-bottom: 3rem;
        }
        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            border-radius: 12px;
            overflow: hidden;
            height: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 86, 179, 0.15);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            border-radius: 12px;
            background-color: var(--light-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: var(--primary-blue);
            font-size: 1.8rem;
        }
        .stats-box {
            text-align: center;
            padding: 2rem;
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-blue);
            line-height: 1;
        }
        .stats-text {
            font-size: 1rem;
            color: var(--text-light);
            margin-top: 0.5rem;
        }
        .bg-light-section {
            background-color: var(--bg-light);
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.6;
            transition: all 0.3s ease;
            padding: 1rem;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 0.6rem 1.5rem;
            margin: 0.5rem;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            color: var(--text-dark);
            font-weight: 500;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background-color: var(--primary-blue);
            color: white;
            transform: translateY(-3px);
        }
        .footer {
            background-color: var(--dark-blue);
            color: rgba(255,255,255,0.8);
            padding-top: 4rem;
            padding-bottom: 2rem;
        }
        .footer h5 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer a {
            color: rgba(255,255,255,0.8);
        }
        .footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 1.5rem;
            margin-top: 3rem;
            text-align: center;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.6);
        }
        .contact-info li {
            margin-bottom: 1.2rem;
            display: flex;
            align-items: flex-start;
        }
        .contact-info i {
            margin-right: 1rem;
            color: var(--accent-orange);
            margin-top: 0.2rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-blue);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0,86,179,0.3);
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--dark-blue);
            color: white;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-padding {
                padding-top: 3rem;
                padding-bottom: 3rem;
            }
            .section-title {
                font-size: 2rem;
            }
        }