:root {
            --primary-green: #2a7d2e;
            --secondary-green: #4caf50;
            --light-green: #e8f5e9;
            --dark-green: #1b5e20;
            --accent-gold: #ffb300;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-green);
        }
        .section-title {
            position: relative;
            padding-bottom: 20px;
            margin-bottom: 40px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-gold);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-green) !important;
        }
        .navbar-brand span {
            color: var(--accent-gold);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), 
                        url('https://images.unsplash.com/photo-1416879595882-3373a0480b5b?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 160px 0 100px;
            margin-top: 80px;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .btn-primary {
            background-color: var(--primary-green);
            border-color: var(--primary-green);
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: var(--dark-green);
            border-color: var(--dark-green);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .service-card {
            background: white;
            border-radius: 12px;
            padding: 30px;
            height: 100%;
            transition: all 0.3s ease;
            border: 1px solid #e0e0e0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
            border-color: var(--secondary-green);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: var(--light-green);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: var(--primary-green);
            font-size: 2rem;
        }
        .project-item {
            position: relative;
            overflow: hidden;
            border-radius: 12px;
            margin-bottom: 30px;
        }
        .project-img {
            height: 300px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .project-item:hover .project-img {
            transform: scale(1.1);
        }
        .project-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0,0,0,0.8));
            padding: 30px;
            color: white;
            transform: translateY(30px);
            transition: transform 0.3s ease;
        }
        .project-item:hover .project-overlay {
            transform: translateY(0);
        }
        .contact-info {
            background: var(--light-green);
            padding: 40px;
            border-radius: 12px;
            height: 100%;
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background: var(--primary-green);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }
        .footer {
            background: var(--dark-green);
            color: white;
            padding: 70px 0 30px;
        }
        .footer a {
            color: #e0e0e0;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .flink {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 8px 20px;
            border-radius: 4px;
            margin: 5px;
            color: white;
            text-decoration: none;
            transition: all 0.3s;
        }
        .flink:hover {
            background: rgba(255,255,255,0.2);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-green);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--dark-green);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 120px 0 80px;
            }
            .section-title {
                margin-bottom: 30px;
            }
        }
        .sticky-nav {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1030;
            background: rgba(255, 255, 255, 0.95);
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
            transition: all 0.3s;
        }
        .content-section {
            padding: 80px 0;
        }
        .company-intro {
            background: var(--light-green);
            border-radius: 15px;
            padding: 40px;
            margin-top: 30px;
        }
        .stats-box {
            text-align: center;
            padding: 30px 20px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s;
        }
        .stats-box:hover {
            transform: translateY(-5px);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-green);
            line-height: 1;
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--light-green);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        .timeline-content {
            padding: 20px 30px;
            background-color: white;
            position: relative;
            border-radius: 6px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.1);
        }
        @media screen and (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
        }
        .quality-badge {
            display: inline-block;
            background: var(--accent-gold);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-right: 10px;
            margin-bottom: 10px;
        }
        .certificate-img {
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            transition: transform 0.3s;
            cursor: pointer;
        }
        .certificate-img:hover {
            transform: scale(1.03);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.6;
            transition: all 0.3s;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }