:root {
            --primary-color: #1a56db;
            --secondary-color: #0e9f6e;
            --accent-color: #7e3af2;
            --dark-color: #1f2937;
            --light-color: #f9fafb;
            --gray-color: #6b7280;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        .section-header {
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-header h2 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--dark-color);
            position: relative;
            display: inline-block;
            margin-bottom: 1rem;
        }
        .section-header h2:after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .section-header p {
            color: var(--gray-color);
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto;
        }
        .navbar {
            padding: 1.2rem 0;
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            margin: 0 0.5rem;
            color: var(--dark-color);
            transition: color 0.3s;
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--primary-color);
        }
        .navbar-toggler {
            border: none;
            padding: 0.5rem;
        }
        .navbar-toggler:focus {
            box-shadow: none;
        }
        .hero-section {
            padding: 8rem 0 6rem;
            background: linear-gradient(135deg, #f0f9ff 0%, #e6f7ff 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-section:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('https://images.unsplash.com/photo-1551288049-bebda4e38f71?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            opacity: 0.1;
        }
        .hero-content h1 {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            color: var(--dark-color);
        }
        .hero-content p {
            font-size: 1.3rem;
            color: var(--gray-color);
            margin-bottom: 2rem;
            max-width: 600px;
        }
        .hero-btns .btn {
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 50px;
            margin-right: 1rem;
            margin-bottom: 1rem;
        }
        .hero-image {
            position: relative;
            animation: float 6s ease-in-out infinite;
        }
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-20px); }
        }
        .service-card {
            background: white;
            border-radius: 15px;
            padding: 2.5rem 2rem;
            height: 100%;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            border: 1px solid #f1f5f9;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            border-color: var(--primary-color);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .service-card h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--dark-color);
        }
        .service-card p {
            color: var(--gray-color);
            margin-bottom: 1.5rem;
        }
        .about-section {
            padding: 6rem 0;
            background-color: var(--light-color);
        }
        .about-image {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
        }
        .about-content h3 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            color: var(--dark-color);
        }
        .stats-container {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 2rem;
            margin-top: 2rem;
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stat-text {
            font-size: 1rem;
            color: var(--gray-color);
            margin-top: 0.5rem;
        }
        .portfolio-section {
            padding: 6rem 0;
        }
        .portfolio-filter {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 3rem;
        }
        .filter-btn {
            background: none;
            border: none;
            padding: 0.5rem 1.5rem;
            margin: 0 0.5rem 1rem;
            font-weight: 600;
            color: var(--gray-color);
            border-radius: 50px;
            transition: all 0.3s;
        }
        .filter-btn:hover, .filter-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
        .portfolio-item {
            border-radius: 15px;
            overflow: hidden;
            margin-bottom: 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
        }
        .portfolio-item:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
        }
        .portfolio-img {
            height: 250px;
            object-fit: cover;
            width: 100%;
        }
        .portfolio-content {
            padding: 1.5rem;
            background: white;
        }
        .portfolio-content h4 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .news-section {
            padding: 6rem 0;
            background-color: var(--light-color);
        }
        .news-card {
            background: white;
            border-radius: 15px;
            overflow: hidden;
            height: 100%;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
        }
        .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
        }
        .news-img {
            height: 200px;
            object-fit: cover;
            width: 100%;
        }
        .news-content {
            padding: 1.8rem;
        }
        .news-date {
            font-size: 0.9rem;
            color: var(--secondary-color);
            font-weight: 600;
            margin-bottom: 0.8rem;
            display: block;
        }
        .news-content h4 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 1rem;
            line-height: 1.4;
        }
        .friendlink {
            padding: 4rem 0;
            background-color: white;
        }
        .friendlink .flink {
            display: inline-block;
            background: var(--light-color);
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            border-radius: 50px;
            color: var(--dark-color);
            font-weight: 500;
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #e5e7eb;
        }
        .friendlink .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .footer {
            background-color: var(--dark-color);
            color: #d1d5db;
            padding: 4rem 0 2rem;
        }
        .footer h5 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            font-weight: 700;
        }
        .footer-links a {
            color: #d1d5db;
            text-decoration: none;
            display: block;
            margin-bottom: 0.8rem;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .contact-info {
            margin-bottom: 1.5rem;
        }
        .contact-info i {
            width: 30px;
            color: var(--secondary-color);
        }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: white;
            margin-right: 0.8rem;
            transition: all 0.3s;
        }
        .social-links a:hover {
            background: var(--primary-color);
            transform: translateY(-3px);
        }
        .copyright {
            border-top: 1px solid #374151;
            padding-top: 2rem;
            margin-top: 3rem;
            text-align: center;
            font-size: 0.9rem;
            color: #9ca3af;
        }
        @media (max-width: 992px) {
            .hero-content h1 {
                font-size: 2.8rem;
            }
            .section-header h2 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 6rem 0 4rem;
            }
            .hero-content h1 {
                font-size: 2.3rem;
            }
            .hero-content p {
                font-size: 1.1rem;
            }
            .section-header h2 {
                font-size: 2rem;
            }
            .stats-container {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            .hero-content h1 {
                font-size: 2rem;
            }
            .section-header h2 {
                font-size: 1.8rem;
            }
            .service-card, .news-card, .portfolio-item {
                margin-bottom: 2rem;
            }
            .filter-btn {
                margin-bottom: 0.8rem;
            }
        }
        .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;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--dark-color);
            color: white;
        }