:root {
            --primary-color: #1a365d;
            --secondary-color: #c53030;
            --accent-color: #f6ad55;
            --light-color: #f7fafc;
            --dark-color: #2d3748;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            line-height: 1.7;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1563986768609-322da13575f3?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 150px 0 100px;
            position: relative;
        }
        .section-title {
            color: var(--primary-color);
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .section-title.text-center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card-hover {
            transition: all 0.3s ease;
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 30px;
            border-radius: 30px;
            font-weight: 600;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(197, 48, 48, 0.3);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0,0,0,0.1);
            padding: 15px 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .nav-link {
            color: var(--dark-color);
            font-weight: 500;
            margin: 0 8px;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary-color);
            transition: width 0.3s ease;
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background-color: #f8f9fa;
            border-radius: 5px;
            color: var(--dark-color);
            text-decoration: none;
            border: 1px solid #dee2e6;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .testimonial-card {
            background-color: #f8f9fa;
            border-left: 4px solid var(--primary-color);
            padding: 25px;
            border-radius: 0 8px 8px 0;
        }
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 60px 0 20px;
        }
        .footer a {
            color: #e2e8f0;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .contact-info i {
            width: 40px;
            height: 40px;
            line-height: 40px;
            text-align: center;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            margin-right: 15px;
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            display: block;
            line-height: 1;
        }
        .stats-label {
            font-size: 1.1rem;
            color: var(--dark-color);
            font-weight: 500;
        }
        .portfolio-item {
            position: relative;
            overflow: hidden;
            border-radius: 8px;
            margin-bottom: 30px;
        }
        .portfolio-item img {
            transition: transform 0.5s ease;
        }
        .portfolio-item:hover img {
            transform: scale(1.05);
        }
        .portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(26, 54, 93, 0.85);
            color: white;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            opacity: 0;
            transition: opacity 0.5s ease;
            padding: 20px;
            text-align: center;
        }
        .portfolio-item:hover .portfolio-overlay {
            opacity: 1;
        }
        .whatsapp-float {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background-color: #25D366;
            color: white;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            text-align: center;
            line-height: 60px;
            font-size: 1.8rem;
            z-index: 100;
            box-shadow: 0 4px 15px rgba(37, 211, 102, 0.4);
            transition: all 0.3s ease;
        }
        .whatsapp-float:hover {
            background-color: #128C7E;
            transform: scale(1.1);
        }
        .back-to-top {
            position: fixed;
            bottom: 100px;
            right: 30px;
            background-color: var(--dark-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            text-align: center;
            line-height: 50px;
            font-size: 1.2rem;
            z-index: 99;
            opacity: 0.7;
            transition: all 0.3s ease;
            display: none;
        }
        .back-to-top:hover {
            opacity: 1;
            background-color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0 60px;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stats-number {
                font-size: 2.5rem;
            }
            .whatsapp-float, .back-to-top {
                bottom: 20px;
                right: 20px;
                width: 50px;
                height: 50px;
                line-height: 50px;
                font-size: 1.5rem;
            }
            .back-to-top {
                bottom: 80px;
            }
        }