:root {
            --primary-color: #1a5fb4;
            --secondary-color: #26a269;
            --dark-color: #1c1c1c;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.7;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-padding {
            padding: 5rem 0;
        }
        .bg-light-custom {
            background-color: #f9fdff;
        }
        .navbar {
            padding: 1.2rem 0;
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 600;
            padding: 0.5rem 1.2rem !important;
            color: var(--dark-color) !important;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 95, 180, 0.9) 0%, rgba(38, 162, 105, 0.85) 100%), url('https://images.unsplash.com/photo-1558494949-ef010cbdcc31?ixlib=rb-4.0.3&auto=format&fit=crop&w=1350&q=80') center/cover no-repeat;
            color: white;
            padding: 10rem 0 8rem;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
            max-width: 700px;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: #0d4a9e;
            border-color: #0d4a9e;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .service-card {
            border-radius: 15px;
            overflow: hidden;
            border: none;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), #3a86ff);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 2rem auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .card-title {
            color: var(--dark-color);
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .about-img {
            border-radius: 15px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }
        .stats-card {
            text-align: center;
            padding: 2rem;
            border-radius: 15px;
            background: white;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
        }
        .stats-card:hover {
            transform: translateY(-5px);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        .portfolio-item {
            border-radius: 15px;
            overflow: hidden;
            position: relative;
            margin-bottom: 30px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
        }
        .portfolio-item:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
        }
        .portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, transparent, rgba(26, 95, 180, 0.9));
            opacity: 0;
            transition: var(--transition);
            display: flex;
            align-items: flex-end;
            padding: 2rem;
            color: white;
        }
        .portfolio-item:hover .portfolio-overlay {
            opacity: 1;
        }
        .testimonial-card {
            border-radius: 15px;
            padding: 2.5rem;
            background: white;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.05);
            margin: 1rem;
            height: 100%;
        }
        .testimonial-text {
            font-style: italic;
            margin-bottom: 1.5rem;
            position: relative;
            padding-left: 1.5rem;
        }
        .testimonial-text::before {
            content: '"';
            font-size: 4rem;
            color: var(--primary-color);
            opacity: 0.3;
            position: absolute;
            left: -10px;
            top: -20px;
        }
        .client-name {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 0.2rem;
        }
        .client-company {
            color: var(--gray-color);
            font-size: 0.9rem;
        }
        .contact-info-card {
            padding: 2rem;
            border-radius: 15px;
            background: white;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
            text-align: center;
            height: 100%;
            transition: var(--transition);
        }
        .contact-info-card:hover {
            transform: translateY(-5px);
        }
        .contact-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), #3a86ff);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .footer {
            background-color: var(--dark-color);
            color: #ddd;
            padding: 4rem 0 1.5rem;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .footer-title {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 3px;
            background-color: var(--primary-color);
        }
        .friendlink-container {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            justify-content: center;
            margin-top: 2rem;
        }
        .flink {
            display: inline-flex;
            align-items: center;
            padding: 0.6rem 1.5rem;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50px;
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
            font-weight: 500;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .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: #aaa;
        }
        .form-control-custom {
            border-radius: 10px;
            padding: 0.8rem 1.2rem;
            border: 1px solid #ddd;
            transition: var(--transition);
        }
        .form-control-custom:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 95, 180, 0.25);
        }
        .section-title {
            text-align: center;
            margin-bottom: 4rem;
            position: relative;
        }
        .section-title h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            display: inline-block;
            position: relative;
        }
        .section-title h2::after {
            content: '';
            position: absolute;
            width: 70px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .section-title p {
            color: var(--gray-color);
            max-width: 700px;
            margin: 1rem auto 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;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #0d4a9e;
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
            .section-title h2 {
                font-size: 2rem;
            }
            .navbar-nav .nav-link {
                padding: 0.5rem 0 !important;
            }
        }