:root {
            --primary-color: #1a365d;
            --secondary-color: #c53030;
            --accent-color: #ed8936;
            --light-color: #f7fafc;
            --dark-color: #2d3748;
            --text-color: #4a5568;
            --border-radius: 8px;
            --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Helvetica Neue', 'Microsoft YaHei', Arial, sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            color: var(--primary-color);
            font-weight: 700;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: var(--box-shadow);
            padding: 15px 0;
            transition: var(--transition);
        }
        .navbar.scrolled {
            padding: 10px 0;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            color: var(--dark-color);
            font-weight: 500;
            margin: 0 8px;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1497366754035-f200968a6e72?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2069&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 150px 0 100px;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 25px;
        }
        .hero-subtitle {
            font-size: 1.2rem;
            margin-bottom: 35px;
            max-width: 700px;
        }
        .section-padding {
            padding: 100px 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 60px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background-color: var(--accent-color);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .card-icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }
        .service-card {
            text-align: center;
            padding: 40px 25px;
            border-top: 5px solid var(--accent-color);
        }
        .business-item {
            background-color: var(--light-color);
            border-radius: var(--border-radius);
            padding: 30px;
            margin-bottom: 30px;
            transition: var(--transition);
            border-left: 5px solid var(--primary-color);
        }
        .business-item:hover {
            background-color: #e2e8f0;
        }
        .stats-section {
            background-color: var(--primary-color);
            color: white;
            padding: 80px 0;
        }
        .stat-item {
            text-align: center;
            padding: 20px;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--accent-color);
            margin-bottom: 10px;
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: var(--transition);
            padding: 20px;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .contact-info {
            background-color: var(--light-color);
            padding: 40px;
            border-radius: var(--border-radius);
            height: 100%;
        }
        .contact-icon {
            font-size: 2rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }
        .contact-form {
            padding: 40px;
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        .form-control {
            padding: 15px;
            border-radius: var(--border-radius);
            border: 1px solid #e2e8f0;
            margin-bottom: 20px;
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.2rem rgba(26, 54, 93, 0.25);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 35px;
            border-radius: var(--border-radius);
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #152642;
            border-color: #152642;
            transform: translateY(-3px);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 35px;
            border-radius: var(--border-radius);
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-secondary:hover {
            background-color: #9b2c2c;
            border-color: #9b2c2c;
            transform: translateY(-3px);
        }
        .footer {
            background-color: var(--dark-color);
            color: white;
            padding: 80px 0 30px;
        }
        .footer-title {
            color: white;
            margin-bottom: 25px;
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #cbd5e0;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid #4a5568;
            padding-top: 30px;
            margin-top: 50px;
            text-align: center;
            color: #a0aec0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 12px 25px;
            margin: 10px;
            border-radius: var(--border-radius);
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            transition: var(--transition);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
            border: 1px solid #e2e8f0;
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .friendlink {
            background-color: var(--light-color);
            padding: 80px 0;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 60px 0;
            }
            .hero-section {
                padding: 120px 0 60px;
            }
            .stat-number {
                font-size: 2.5rem;
            }
            .contact-info, .contact-form {
                padding: 25px;
            }
        }
        @media (max-width: 576px) {
            .hero-title {
                font-size: 2rem;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
        }
        .news-card {
            height: 100%;
            transition: var(--transition);
        }
        .news-card:hover {
            transform: translateY(-5px);
        }
        .news-date {
            background-color: var(--secondary-color);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            display: inline-block;
            font-size: 0.9rem;
            margin-bottom: 15px;
        }
        .news-img {
            height: 200px;
            object-fit: cover;
            border-radius: var(--border-radius) var(--border-radius) 0 0;
        }
        .modal-content {
            border-radius: var(--border-radius);
            border: none;
        }
        .modal-header {
            background-color: var(--primary-color);
            color: white;
            border-radius: var(--border-radius) var(--border-radius) 0 0;
        }
        .modal-title {
            color: white;
        }
        .close-btn {
            color: white;
            opacity: 0.8;
        }
        .close-btn:hover {
            color: white;
            opacity: 1;
        }