:root {
            --primary-color: #0056b3;
            --secondary-color: #00a8e8;
            --accent-color: #ff6b35;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.8;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--dark-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            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);
        }
        .section-title.left-align:after {
            left: 0;
            transform: none;
        }
        .navbar {
            padding: 1rem 0;
            transition: all 0.3s ease;
            background: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            margin: 0 10px;
            color: var(--dark-color) !important;
            transition: color 0.3s;
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: var(--primary-color) !important;
        }
        .hero {
            background: linear-gradient(135deg, rgba(0, 86, 179, 0.9) 0%, rgba(0, 168, 232, 0.9) 100%), url('https://images.unsplash.com/photo-1518709268805-4e9042af2176?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0 100px;
            margin-top: 76px;
        }
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            color: white;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 2rem;
        }
        .feature-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .service-item {
            padding: 2rem;
            border-radius: 10px;
            background: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            height: 100%;
        }
        .service-item:hover {
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            transform: translateY(-5px);
        }
        .service-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .portfolio-item {
            position: relative;
            overflow: hidden;
            border-radius: 10px;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .portfolio-img {
            width: 100%;
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .portfolio-item:hover .portfolio-img {
            transform: scale(1.05);
        }
        .portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 86, 179, 0.9);
            color: white;
            opacity: 0;
            transition: opacity 0.3s;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 20px;
            text-align: center;
        }
        .portfolio-item:hover .portfolio-overlay {
            opacity: 1;
        }
        .team-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s;
            height: 100%;
        }
        .team-card:hover {
            transform: translateY(-10px);
        }
        .team-img {
            height: 280px;
            width: 100%;
            object-fit: cover;
        }
        .contact-form .form-control {
            padding: 12px 15px;
            border-radius: 5px;
            border: 1px solid #ddd;
            margin-bottom: 20px;
            transition: all 0.3s;
        }
        .contact-form .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 86, 179, 0.25);
        }
        footer {
            background: #1a1a1a;
            color: #bbb;
            padding-top: 60px;
        }
        footer h5 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        footer a {
            color: #bbb;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .social-links a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 10px;
            transition: all 0.3s;
        }
        .social-links a:hover {
            background: var(--primary-color);
            transform: translateY(-3px);
        }
        .copyright {
            background: #111;
            padding: 20px 0;
            margin-top: 50px;
            font-size: 0.9rem;
        }
        friendlink {
            display: block;
            padding: 30px 0;
            background: #f8f9fa;
            border-top: 1px solid #eee;
        }
        .flink {
            display: inline-block;
            margin: 5px 15px;
            padding: 8px 20px;
            background: white;
            border-radius: 5px;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            border: 1px solid #eee;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 86, 179, 0.2);
            border-color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero {
                padding: 100px 0 60px;
                margin-top: 66px;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 576px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 1rem;
            }
        }
        .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;
            font-size: 1.2rem;
            z-index: 1000;
            cursor: pointer;
            opacity: 0;
            transition: all 0.3s;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
        }
        .back-to-top.active {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }