:root {
            --primary-color: #0056b3;
            --secondary-color: #28a745;
            --accent-color: #ffc107;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
        }
        body {
            font-family: var(--font-family);
            color: var(--dark-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
        }
        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: var(--secondary-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            padding: 1rem 0;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            margin: 0 0.5rem;
            position: relative;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            left: 50%;
            bottom: -5px;
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .hero {
            background: linear-gradient(rgba(0, 84, 179, 0.8), rgba(40, 167, 69, 0.7)), url('https://images.unsplash.com/photo-1488646953014-85cb44e25828?ixlib=rb-4.0.3&auto=format&fit=crop&w=1350&q=80') no-repeat center center/cover;
            color: white;
            padding: 8rem 0;
            text-align: center;
        }
        .hero h1 {
            font-size: 3.5rem;
            color: white;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.5);
        }
        .hero p {
            font-size: 1.5rem;
            margin-bottom: 2rem;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 0.75rem 2rem;
            font-size: 1.1rem;
            border-radius: 50px;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
        }
        .section {
            padding: 5rem 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 80px;
            height: 4px;
            background: var(--accent-color);
            margin: 1rem auto;
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 15px;
            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, 0.15);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .card-body {
            padding: 1.5rem;
        }
        .icon-box {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .testimonial {
            background-color: var(--light-color);
            border-left: 5px solid var(--secondary-color);
            padding: 2rem;
            margin-bottom: 2rem;
            border-radius: 10px;
        }
        .testimonial-author {
            font-weight: bold;
            margin-top: 1rem;
            color: var(--primary-color);
        }
        .friendlink {
            background-color: #f1f8ff;
            padding: 3rem 0;
        }
        .flink {
            display: inline-block;
            margin: 0.5rem 1rem;
            padding: 0.5rem 1.5rem;
            background: white;
            border-radius: 50px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            color: var(--dark-color);
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        footer a {
            color: var(--light-color);
        }
        footer a:hover {
            color: var(--accent-color);
        }
        .social-icons a {
            display: inline-block;
            margin: 0 0.5rem;
            font-size: 1.5rem;
            transition: transform 0.3s ease;
        }
        .social-icons a:hover {
            transform: scale(1.2);
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1.2rem;
            }
            .section {
                padding: 3rem 0;
            }
            .card-img-top {
                height: 180px;
            }
        }