:root {
            --primary-color: #1a6fb3;
            --secondary-color: #0fa36b;
            --accent-color: #ff9800;
            --dark-color: #2c3e50;
            --light-color: #f8f9fa;
            --text-color: #333;
            --text-light: #666;
            --border-color: #eaeaea;
            --shadow-light: rgba(0, 0, 0, 0.05);
            --shadow-medium: rgba(0, 0, 0, 0.1);
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .section-title.text-center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .navbar-brand span {
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 111, 179, 0.85), rgba(15, 163, 107, 0.8)), url('https://images.unsplash.com/photo-1570172619644-dfd03ed5d881?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            color: white;
            padding: 180px 0 120px;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 25px;
            text-shadow: 2px 2px 5px rgba(0,0,0,0.3);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .service-card {
            border-radius: 12px;
            overflow: hidden;
            border: none;
            box-shadow: 0 10px 30px var(--shadow-light);
            transition: transform 0.4s ease, box-shadow 0.4s ease;
            height: 100%;
            margin-bottom: 30px;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px var(--shadow-medium);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 2rem;
        }
        .stats-counter {
            background: linear-gradient(rgba(26, 111, 179, 0.9), rgba(15, 163, 107, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            padding: 80px 0;
            color: white;
        }
        .stat-item .count {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1;
        }
        .project-card {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 25px var(--shadow-light);
            transition: transform 0.3s ease;
            margin-bottom: 30px;
        }
        .project-card:hover {
            transform: translateY(-8px);
        }
        .project-card img {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .project-card:hover img {
            transform: scale(1.05);
        }
        .testimonial-card {
            border-left: 5px solid var(--primary-color);
            padding-left: 25px;
            margin-bottom: 30px;
        }
        .testimonial-author {
            font-weight: 600;
            color: var(--dark-color);
            margin-top: 20px;
        }
        .contact-info-box {
            background: var(--light-color);
            border-radius: 12px;
            padding: 30px;
            margin-bottom: 30px;
            text-align: center;
            box-shadow: 0 8px 20px var(--shadow-light);
            transition: transform 0.3s ease;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .contact-info-box i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .friendlink {
            background-color: #f9f9f9;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: 8px;
            box-shadow: 0 5px 15px var(--shadow-light);
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--dark-color);
            color: #ccc;
            padding-top: 70px;
        }
        footer a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .footer-bottom {
            border-top: 1px solid #444;
            padding: 20px 0;
            margin-top: 50px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #0e5a8a;
            border-color: #0e5a8a;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(26, 111, 179, 0.2);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .btn-secondary:hover {
            background-color: #0c8a52;
            border-color: #0c8a52;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(15, 163, 107, 0.2);
        }
        .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: 1.5rem;
            z-index: 1000;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        .content-section {
            padding: 100px 0;
        }
        .bg-light-alt {
            background-color: #f8fafc;
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--primary-color);
            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: 12px;
            box-shadow: 0 5px 15px var(--shadow-light);
        }
        .timeline-item:nth-child(odd)::before {
            content: " ";
            height: 0;
            position: absolute;
            top: 22px;
            width: 0;
            z-index: 1;
            right: 30px;
            border: medium solid white;
            border-width: 10px 0 10px 10px;
            border-color: transparent transparent transparent white;
        }
        .timeline-item:nth-child(even)::before {
            content: " ";
            height: 0;
            position: absolute;
            top: 22px;
            width: 0;
            z-index: 1;
            left: 30px;
            border: medium solid white;
            border-width: 10px 10px 10px 0;
            border-color: transparent white transparent transparent;
        }
        .timeline-item::after {
            content: '';
            position: absolute;
            width: 25px;
            height: 25px;
            right: -17px;
            background-color: white;
            border: 4px solid var(--primary-color);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }
        .timeline-item:nth-child(even)::after {
            left: -16px;
        }
        @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%;
            }
            .timeline-item::before {
                left: 60px;
                border: medium solid white;
                border-width: 10px 10px 10px 0;
                border-color: transparent white transparent transparent;
            }
            .timeline-item:nth-child(odd)::before {
                left: 60px;
                border: medium solid white;
                border-width: 10px 10px 10px 0;
                border-color: transparent white transparent transparent;
            }
            .timeline-item::after {
                left: 15px;
            }
        }