:root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --accent-color: #3b82f6;
            --light-color: #f8fafc;
            --dark-color: #1e293b;
            --text-color: #334155;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            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.scrolled {
            padding-top: 0.5rem;
            padding-bottom: 0.5rem;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 0.5rem;
            color: var(--dark-color);
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.9) 0%, rgba(30, 64, 175, 0.9) 100%), url('https://images.unsplash.com/photo-1497366216548-37526070297c?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 6rem 0;
            min-height: 80vh;
            display: flex;
            align-items: center;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
        }
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--dark-color);
            position: relative;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 70px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        .section-subtitle {
            color: #64748b;
            font-size: 1.1rem;
            margin-bottom: 3rem;
        }
        .service-card {
            border-radius: 12px;
            overflow: hidden;
            border: none;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            transition: all 0.4s ease;
            height: 100%;
            background-color: white;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(37, 99, 235, 0.15);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .card-title {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 1rem;
        }
        .process-step {
            text-align: center;
            padding: 2rem;
            border-radius: 12px;
            background-color: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            height: 100%;
        }
        .process-step:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .step-number {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.3rem;
            margin: 0 auto 1.5rem;
        }
        .portfolio-item {
            border-radius: 12px;
            overflow: hidden;
            position: relative;
            margin-bottom: 1.5rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        .portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to top, rgba(30, 64, 175, 0.85), transparent);
            opacity: 0;
            transition: all 0.4s ease;
            display: flex;
            align-items: flex-end;
            padding: 2rem;
        }
        .portfolio-item:hover .portfolio-overlay {
            opacity: 1;
        }
        .testimonial-card {
            background-color: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            height: 100%;
        }
        .testimonial-text {
            font-style: italic;
            margin-bottom: 1.5rem;
            color: #475569;
        }
        .client-info {
            display: flex;
            align-items: center;
        }
        .client-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            overflow: hidden;
            margin-right: 1rem;
            border: 3px solid var(--light-color);
        }
        .contact-info-box {
            background-color: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            text-align: center;
            transition: all 0.3s ease;
            height: 100%;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 1.5rem;
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1.5rem;
            background-color: white;
            border-radius: 8px;
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            margin: 0.5rem;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            border: 1px solid #e2e8f0;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 8px 15px rgba(37, 99, 235, 0.2);
        }
        .footer {
            background-color: var(--dark-color);
            color: #cbd5e1;
            padding-top: 4rem;
            padding-bottom: 2rem;
        }
        .footer-title {
            color: white;
            font-weight: 700;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-link {
            color: #94a3b8;
            text-decoration: none;
            display: block;
            margin-bottom: 0.7rem;
            transition: color 0.3s;
        }
        .footer-link:hover {
            color: white;
        }
        .copyright {
            border-top: 1px solid #334155;
            padding-top: 1.5rem;
            margin-top: 3rem;
            text-align: center;
            color: #94a3b8;
        }
        .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;
            box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
            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-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .hero-section {
                padding: 4rem 0;
                min-height: 70vh;
            }
        }