:root {
            --primary-color: #1a6d3b;
            --secondary-color: #0d4d27;
            --accent-color: #34a853;
            --light-bg: #f8f9fa;
            --text-dark: #333;
            --text-light: #666;
        }
        body {
            font-family: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.6;
        }
        h1, h2, h3, h4, h5 {
            color: var(--secondary-color);
            font-weight: 600;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .nav-link {
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-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-1589652717521-10c0d092dea9?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
            margin-top: 76px;
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: 0;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--primary-color);
        }
        .card {
            border: none;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-icon {
            width: 70px;
            height: 70px;
            background-color: rgba(26, 109, 59, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 30px;
            font-weight: 500;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        .service-card {
            border-top: 4px solid var(--primary-color);
        }
        .process-step {
            position: relative;
            padding: 30px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            text-align: center;
            margin-bottom: 30px;
        }
        .step-number {
            position: absolute;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 40px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        .project-img {
            height: 250px;
            object-fit: cover;
            border-top-left-radius: 10px;
            border-top-right-radius: 10px;
        }
        .news-card {
            border-left: 4px solid var(--primary-color);
            padding-left: 15px;
            margin-bottom: 25px;
        }
        .contact-info {
            background-color: var(--light-bg);
            padding: 30px;
            border-radius: 10px;
            height: 100%;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-color);
            font-size: 1.3rem;
            margin-right: 15px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
        }
        .flink {
            display: inline-block;
            background-color: var(--light-bg);
            padding: 10px 20px;
            border-radius: 5px;
            margin: 5px 10px 5px 0;
            color: var(--text-dark);
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: #222;
            color: #ddd;
        }
        .footer-links a {
            color: #bbb;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: white;
        }
        .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;
            cursor: pointer;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
                margin-top: 66px;
            }
            .section-padding {
                padding: 50px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            display: block;
            margin-bottom: 10px;
        }
        .team-member {
            text-align: center;
            margin-bottom: 30px;
        }
        .team-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin-bottom: 15px;
            border: 5px solid var(--light-bg);
        }
        .certificate-item {
            background-color: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            text-align: center;
            height: 100%;
            transition: transform 0.3s;
        }
        .certificate-item:hover {
            transform: translateY(-5px);
        }
        .certificate-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }