:root {
            --primary: #0066cc;
            --secondary: #2d3748;
            --accent: #00a8ff;
            --light-bg: #f8f9fa;
            --dark-bg: #1a202c;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--secondary);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
            padding-top: 0.8rem;
            padding-bottom: 0.8rem;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary) !important;
        }
        .navbar-brand i {
            color: var(--accent);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(0,102,204,0.9) 0%, rgba(0,168,255,0.85) 100%), url('https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            padding: 8rem 0;
            position: relative;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent);
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1) !important;
        }
        .service-card {
            border-top: 5px solid var(--accent);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: linear-gradient(45deg, var(--primary), var(--accent));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .btn-primary {
            background-color: var(--primary);
            border: none;
            padding: 0.75rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: var(--accent);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 168, 255, 0.3);
        }
        .btn-outline-primary {
            border: 2px solid var(--primary);
            color: var(--primary);
            padding: 0.75rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-outline-primary:hover {
            background-color: var(--primary);
            color: white;
            transform: translateY(-3px);
        }
        .process-step {
            position: relative;
            padding: 2rem;
            background: white;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            text-align: center;
            transition: all 0.3s ease;
        }
        .process-step:hover {
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .step-number {
            position: absolute;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }
        footer {
            background-color: var(--dark-bg);
            color: #cbd5e0;
            padding-top: 4rem;
        }
        .footer-links a {
            color: #a0aec0;
            text-decoration: none;
            transition: color 0.3s ease;
            display: block;
            margin-bottom: 0.5rem;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .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%;
            margin-right: 10px;
            color: white;
            transition: all 0.3s ease;
        }
        .social-links a:hover {
            background: var(--accent);
            transform: translateY(-3px);
        }
        .friendlink {
            background: rgba(255,255,255,0.05);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        .flink {
            display: inline-block;
            background: rgba(255,255,255,0.08);
            color: #a0aec0;
            padding: 0.5rem 1.2rem;
            margin: 0.3rem;
            border-radius: 50px;
            text-decoration: none;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            border: 1px solid rgba(255,255,255,0.1);
        }
        .flink:hover {
            background: var(--accent);
            color: white;
            border-color: var(--accent);
            transform: translateY(-2px);
        }
        .contact-info-box {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            text-align: center;
            transition: all 0.3s ease;
            height: 100%;
        }
        .contact-info-box:hover {
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            transform: translateY(-5px);
        }
        .contact-info-box i {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 1.5rem;
        }
        .testimonial-card {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-bottom: 2rem;
            position: relative;
        }
        .testimonial-card:before {
            content: "\201C";
            font-size: 5rem;
            color: rgba(0,102,204,0.1);
            position: absolute;
            top: -20px;
            left: 20px;
            font-family: serif;
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: all 0.3s ease;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .stats-box {
            text-align: center;
            padding: 2rem 1rem;
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 0.5rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--accent);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 5rem 0;
            }
            .section-title {
                margin-bottom: 2rem;
            }
            .display-4 {
                font-size: 2.2rem;
            }
        }