:root {
            --primary: #0056b3;
            --secondary: #e63946;
            --dark: #1d3557;
            --light: #f8f9fa;
            --accent: #ffd166;
        }
        body {
            font-family: 'Helvetica Neue', 'Microsoft YaHei', Arial, sans-serif;
            color: #333;
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1593359677879-a4bb92f829d1?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 30px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background: var(--primary);
        }
        .product-card {
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid #eee;
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .product-img {
            height: 250px;
            object-fit: cover;
            width: 100%;
        }
        .tech-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        .feature-box {
            padding: 30px 20px;
            border-radius: 8px;
            background: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: transform 0.3s;
        }
        .feature-box:hover {
            transform: translateY(-5px);
        }
        .contact-info li {
            margin-bottom: 15px;
            display: flex;
            align-items: center;
        }
        .contact-info i {
            width: 30px;
            color: var(--primary);
        }
        footer {
            background: var(--dark);
            color: white;
        }
        .friendlink {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
            margin-top: 20px;
        }
        .flink {
            color: #ccc;
            text-decoration: none;
            padding: 8px 15px;
            border: 1px solid #444;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .flink:hover {
            color: white;
            border-color: var(--primary);
            background: rgba(255, 255, 255, 0.05);
        }
        .content-section {
            padding: 80px 0;
        }
        .content-section:nth-child(even) {
            background: var(--light);
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(0, 86, 179, 0.1);
            color: var(--primary);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--primary);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
            padding-left: 20px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -30px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--primary);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 0;
        }
        .stats-label {
            font-size: 1.1rem;
            color: #666;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            .content-section {
                padding: 50px 0;
            }
            .stats-number {
                font-size: 2.2rem;
            }
        }