:root {
            --primary-blue: #0056b3;
            --industrial-red: #c8102e;
            --dark-gray: #333;
            --medium-gray: #666;
            --light-gray: #f8f9fa;
            --gradient-primary: linear-gradient(135deg, var(--primary-blue) 0%, #003d82 100%);
            --gradient-dark: linear-gradient(135deg, var(--dark-gray) 0%, #000 100%);
            --shadow-sm: 0 .125rem .25rem rgba(0,0,0,.075);
            --shadow-md: 0 .5rem 1rem rgba(0,0,0,.15);
            --shadow-lg: 0 1rem 3rem rgba(0,0,0,.175);
            --transition-base: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--dark-gray);
            overflow-x: hidden;
            line-height: 1.8;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--industrial-red);
        }
        .bg-gradient-primary {
            background: var(--gradient-primary);
        }
        .bg-gradient-dark {
            background: var(--gradient-dark);
        }
        .navbar {
            padding: 1rem 0;
            transition: var(--transition-base);
            background-color: rgba(255,255,255,0.95);
            box-shadow: var(--shadow-sm);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-blue);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1.2rem;
            color: var(--dark-gray);
            transition: var(--transition-base);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: var(--industrial-red);
        }
        .hero-section {
            height: 100vh;
            min-height: 700px;
            background: 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;
            background-size: cover;
            position: relative;
            display: flex;
            align-items: center;
        }
        .hero-section:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 30, 60, 0.7);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            color: #fff;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .service-card,
        .product-card,
        .news-card {
            height: 100%;
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: var(--transition-base);
            background: #fff;
        }
        .service-card:hover,
        .product-card:hover,
        .news-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: var(--transition-base);
        }
        .service-card:hover .card-img-top {
            transform: scale(1.05);
        }
        .icon-box {
            width: 80px;
            height: 80px;
            background: var(--gradient-primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: -40px auto 20px;
            color: white;
            font-size: 2rem;
            box-shadow: var(--shadow-md);
        }
        .counter-box {
            text-align: center;
            padding: 2rem;
            background: white;
            border-radius: 10px;
            box-shadow: var(--shadow-md);
            transition: var(--transition-base);
        }
        .counter-box:hover {
            background: var(--light-gray);
        }
        .counter {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-blue);
            line-height: 1;
        }
        .timeline {
            position: relative;
            padding-left: 3rem;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: var(--primary-blue);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -3.4rem;
            top: 0.5rem;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--industrial-red);
            border: 4px solid white;
            box-shadow: 0 0 0 3px var(--primary-blue);
        }
        .friendlink .flink {
            display: inline-block;
            padding: 0.8rem 1.8rem;
            margin: 0.5rem;
            background: white;
            border-radius: 50px;
            color: var(--medium-gray);
            text-decoration: none;
            border: 2px solid #eaeaea;
            transition: var(--transition-base);
            font-weight: 500;
        }
        .friendlink .flink:hover {
            background: var(--primary-blue);
            color: white;
            border-color: var(--primary-blue);
            transform: translateY(-3px);
        }
        .footer {
            background: #1a1a1a;
            color: #ccc;
            padding-top: 4rem;
        }
        .footer a {
            color: #ccc;
            text-decoration: none;
            transition: var(--transition-base);
        }
        .footer a:hover {
            color: white;
        }
        .footer-bottom {
            border-top: 1px solid #333;
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        .btn-primary-custom {
            background: var(--gradient-primary);
            border: none;
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition-base);
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,86,179,0.3);
        }
        .btn-outline-custom {
            border: 2px solid var(--primary-blue);
            color: var(--primary-blue);
            background: transparent;
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition-base);
        }
        .btn-outline-custom:hover {
            background: var(--primary-blue);
            color: white;
            transform: translateY(-3px);
        }
        .form-control-custom {
            border: 1px solid #ddd;
            border-radius: 5px;
            padding: 0.8rem 1.2rem;
            transition: var(--transition-base);
        }
        .form-control-custom:focus {
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 0.25rem rgba(0,86,179,0.25);
        }