:root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color: #e74c3c;
            --light-color: #ecf0f1;
            --dark-color: #2c3e50;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            color: white;
            padding: 120px 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiB2aWV3Qm94PSIwIDAgMTIwMCA2MDAiIHByZXNlcnZlQXNwZWN0UmF0aW89Im5vbmUiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PGcgZmlsbD0icmdiYSgyNTUsMjU1LDI1NSwwLjA1KSI+PGNpcmNsZSBjeD0iMCIgY3k9IjAiIHI9IjIwMCI+PC9jaXJjbGU+PGNpcmNsZSBjeD0iMTIwMCIgY3k9IjAiIHI9IjMwMCI+PC9jaXJjbGU+PGNpcmNsZSBjeD0iNjAwIiBjeT0iNjAwIiByPSIyNTAiPjwvY2lyY2xlPjwvZz48L3N2Zz4=');
            opacity: 0.1;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            color: var(--primary-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--secondary-color);
        }
        .text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .service-card {
            transition: var(--transition);
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background: var(--secondary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 1.8rem;
        }
        .portfolio-item {
            position: relative;
            overflow: hidden;
            border-radius: 8px;
            margin-bottom: 30px;
        }
        .portfolio-img {
            transition: var(--transition);
            width: 100%;
            height: 250px;
            object-fit: cover;
        }
        .portfolio-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(44, 62, 80, 0.9), transparent);
            color: white;
            padding: 20px;
            transform: translateY(100%);
            transition: var(--transition);
        }
        .portfolio-item:hover .portfolio-overlay {
            transform: translateY(0);
        }
        .portfolio-item:hover .portfolio-img {
            transform: scale(1.05);
        }
        .testimonial-card {
            background: var(--light-color);
            border-radius: 10px;
            padding: 30px;
            margin: 15px 0;
            border-left: 4px solid var(--secondary-color);
        }
        .client-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            margin-right: 15px;
        }
        .contact-info {
            padding: 20px;
            background: var(--light-color);
            border-radius: 8px;
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .contact-info:hover {
            background: var(--secondary-color);
            color: white;
            transform: translateY(-5px);
        }
        .contact-icon {
            font-size: 1.8rem;
            color: var(--secondary-color);
            margin-bottom: 15px;
        }
        .contact-info:hover .contact-icon {
            color: white;
        }
        .friendlink {
            background: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 8px;
            background: white;
            border-radius: 5px;
            text-decoration: none;
            color: var(--dark-color);
            border: 1px solid #dee2e6;
            transition: var(--transition);
            font-weight: 500;
        }
        .flink:hover {
            background: var(--secondary-color);
            color: white;
            border-color: var(--secondary-color);
            transform: translateY(-3px);
        }
        .footer {
            background: var(--primary-color);
            color: white;
            padding: 60px 0 20px;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: var(--secondary-color);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }