:root {
            --primary-color: #2c3e50;
            --secondary-color: #e74c3c;
            --accent-color: #3498db;
            --light-color: #ecf0f1;
            --dark-color: #1a252f;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            line-height: 1.8;
        }
        .navbar {
            background-color: var(--primary-color) !important;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--light-color) !important;
        }
        .nav-link {
            color: var(--light-color) !important;
            font-weight: 500;
            margin: 0 10px;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1519710164239-da123dc03ef4?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            color: white;
            padding: 180px 0;
            text-align: center;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 20px;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            text-align: center;
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: transform 0.4s, box-shadow 0.4s;
            margin-bottom: 30px;
        }
        .card:hover {
            transform: translateY(-15px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: 600;
            transition: background-color 0.3s, transform 0.3s;
        }
        .btn-primary:hover {
            background-color: #c0392b;
            transform: scale(1.05);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--accent-color);
            margin-bottom: 20px;
        }
        .team-member img {
            width: 200px;
            height: 200px;
            object-fit: cover;
            border-radius: 50%;
            border: 5px solid var(--light-color);
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .footer {
            background-color: var(--dark-color);
            color: var(--light-color);
            padding: 60px 0 30px;
        }
        .footer a {
            color: var(--light-color);
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: var(--secondary-color);
        }
        .friendlinks {
            background-color: #f8f9fa;
            padding: 40px 0;
            border-top: 1px solid #dee2e6;
        }
        .flink {
            display: inline-block;
            margin: 10px 20px;
            padding: 10px 20px;
            background-color: white;
            border-radius: 50px;
            color: var(--primary-color);
            font-weight: 500;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        .flink:hover {
            background-color: var(--accent-color);
            color: white;
            transform: translateY(-5px);
            text-decoration: none;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
            z-index: 1000;
            transition: opacity 0.3s;
        }
        .back-to-top:hover {
            background-color: #c0392b;
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 120px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }