:root {
            --primary-color: #28a745;
            --secondary-color: #f8f9fa;
            --accent-color: #ffc107;
            --text-dark: #343a40;
            --text-light: #6c757d;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            overflow-x: hidden;
            line-height: 1.6;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 600;
            color: var(--text-dark);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand i {
            color: var(--accent-color);
        }
        .hero-section {
            background: linear-gradient(rgba(40, 167, 69, 0.85), rgba(40, 167, 69, 0.9)), url('https://images.unsplash.com/photo-1610832958506-aa56368176cf?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
            min-height: 90vh;
            display: flex;
            align-items: center;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow);
            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;
            transition: var(--transition);
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 25px;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #218838;
            border-color: #1e7e34;
            transform: translateY(-3px);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .testimonial-item {
            background-color: var(--secondary-color);
            padding: 30px;
            border-radius: 15px;
            margin-bottom: 30px;
        }
        .testimonial-item img {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            object-fit: cover;
            border: 4px solid white;
            box-shadow: var(--shadow);
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 5px;
            background-color: white;
            border-radius: 8px;
            color: var(--text-dark);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #eaeaea;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .footer {
            background-color: #2e2e2e;
            color: #ddd;
            padding-top: 60px;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: var(--primary-color);
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            margin-right: 10px;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .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;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #218838;
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
                text-align: center;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }