:root {
            --primary-blue: #0d6efd;
            --industrial-blue: #1a4f8c;
            --accent-orange: #fd7e14;
            --light-gray-bg: #f8f9fa;
            --text-dark: #212529;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.8;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--industrial-blue) !important;
        }
        .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem !important;
            transition: color 0.3s, background-color 0.3s;
            border-radius: 4px;
        }
        .nav-link:hover {
            color: var(--accent-orange) !important;
            background-color: rgba(253, 126, 20, 0.05);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 79, 140, 0.85), rgba(13, 110, 253, 0.8)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0 80px;
            margin-top: 56px;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            font-weight: 700;
            color: var(--industrial-blue);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--accent-orange);
            border-radius: 2px;
        }
        .card-hover {
            transition: transform 0.4s ease, box-shadow 0.4s ease;
            border: none;
            border-radius: 10px;
            overflow: hidden;
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1) !important;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary-blue), var(--industrial-blue));
            color: white;
            border-radius: 10px;
            margin-bottom: 20px;
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .card-hover:hover .product-img {
            transform: scale(1.05);
        }
        .bg-light-section {
            background-color: var(--light-gray-bg);
        }
        .btn-industrial {
            background: linear-gradient(to right, var(--industrial-blue), var(--primary-blue));
            color: white;
            padding: 10px 25px;
            border-radius: 5px;
            border: none;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-industrial:hover {
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 10px 15px rgba(13, 110, 253, 0.2);
        }
        .contact-info-box {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
            transition: transform 0.3s;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .footer {
            background-color: #1c2b39;
            color: #b0b7c3;
            padding-top: 60px;
        }
        .footer a {
            color: #b0b7c3;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
        }
        .flink {
            display: inline-block;
            background: rgba(255,255,255,0.05);
            padding: 8px 20px;
            margin: 5px;
            border-radius: 5px;
            border: 1px solid rgba(255,255,255,0.1);
            transition: all 0.3s;
        }
        .flink:hover {
            background: rgba(255,255,255,0.1);
            border-color: var(--accent-orange);
            transform: translateY(-3px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--accent-orange);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 10px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--primary-blue);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -33px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--accent-orange);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-blue);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }