:root {
            --primary-color: #1a5f7a;
            --secondary-color: #2c7873;
            --accent-color: #ff7e5f;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
            line-height: 1.7;
            color: var(--dark-color);
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95) !important;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
            padding-top: 0.8rem;
            padding-bottom: 0.8rem;
        }
        .navbar.scrolled {
            padding-top: 0.5rem;
            padding-bottom: 0.5rem;
        }
        .nav-link {
            font-weight: 600;
            margin: 0 0.5rem;
            color: var(--dark-color) !important;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--accent-color);
            left: 50%;
            bottom: 0;
            transition: all 0.3s ease;
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 80%;
            left: 10%;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 95, 122, 0.85), rgba(44, 120, 115, 0.9)), url('https://images.unsplash.com/photo-1450101499163-c8848c66ca85?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            padding: 8rem 0;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .section-padding {
            padding-top: 6rem;
            padding-bottom: 6rem;
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--accent-color);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: var(--light-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: var(--primary-color);
            font-size: 1.8rem;
            transition: all 0.3s ease;
            border: 1px solid rgba(26, 95, 122, 0.1);
        }
        .service-card, .product-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: all 0.4s ease;
            height: 100%;
            background: white;
        }
        .service-card:hover, .product-card:hover {
            transform: translateY(-12px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }
        .service-card:hover .icon-box {
            background: var(--primary-color);
            color: white;
            transform: rotateY(180deg);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover .card-img-top {
            transform: scale(1.05);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-primary:hover, .btn-primary:focus {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(26, 95, 122, 0.2);
        }
        .btn-outline-primary {
            color: var(--primary-color);
            border-color: var(--primary-color);
            border-radius: 50px;
            padding: 0.75rem 2rem;
            font-weight: 600;
        }
        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
            margin-top: 3rem;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -36px;
            top: 8px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--accent-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        .contact-info-box {
            background: var(--light-color);
            padding: 2rem;
            border-radius: 12px;
            text-align: center;
            height: 100%;
            border-left: 5px solid var(--primary-color);
            transition: all 0.3s ease;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .contact-info-box i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        footer {
            background-color: var(--dark-color);
            color: #ddd;
            padding-top: 4rem;
            padding-bottom: 2rem;
        }
        footer a {
            color: #bbb;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: white;
        }
        .footer-links {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .copyright {
            border-top: 1px solid #555;
            margin-top: 3rem;
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.9rem;
            color: #aaa;
        }
        .friendlink {
            background-color: #f9f9f9;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 0.8rem 1.8rem;
            margin: 0.5rem;
            border-radius: 50px;
            color: var(--gray-color);
            text-decoration: none;
            border: 1px solid #eee;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        .flink:hover {
            color: var(--primary-color);
            border-color: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .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;
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s ease;
            z-index: 1000;
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            color: white;
        }
        .animate-on-scroll {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }
        .animate-on-scroll.animated {
            opacity: 1;
            transform: translateY(0);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            display: block;
            line-height: 1;
        }
        .stat-label {
            font-size: 1rem;
            color: var(--gray-color);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
        }