/* Global reset */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: Arial, Helvetica, sans-serif;
        }
        body {
            color: #333;
            background-color: #f8f9fa;
            padding: 20px;
        }
        .container {
            width: 100%;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 15px;
        }
        /* Core Products Section */
        .products {
            padding: 40px 0;
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            margin-bottom: 40px;
        }
        .section-title {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-title h2 {
            font-size: 32px;
            color: #003366;
            margin-bottom: 15px;
            font-weight: 600;
        }
        .section-title p {
            color: #666;
            font-size: 16px;
            max-width: 800px;
            margin: 0 auto;
        }
        /* Product Table */
        .product-table-wrap {
            overflow-x: auto;
            margin-bottom: 30px;
            padding: 0 10px;
        }
        .product-table {
            width: 100%;
            border-collapse: collapse;
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .product-table th, .product-table td {
            padding: 15px 12px;
            text-align: center;
            border: 1px solid #eee;
        }
        .product-table th {
            background-color: #003366;
            color: #fff;
            font-weight: normal;
            font-size: 15px;
            position: sticky;
            top: 0;
        }
        .product-table tr:nth-child(even) {
            background-color: #f8f9fa;
        }
        .product-table tr:hover {
            background-color: #f1f5f9;
        }
        .product-table td {
            font-size: 14px;
            vertical-align: top;
            white-space: pre-line; /* 支持多行型号换行展示 */
        }
        /* Highlight for military grade */
        .product-table td:nth-child(5) {
            color: #0047ab;
            font-weight: 500;
        }
        /* Core Advantages */
        .advantages {
            padding: 40px 0;
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            margin-bottom: 40px;
        }
        .advantage-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            margin-top: 30px;
            padding: 0 10px;
        }
        .advantage-item {
            background-color: #fff;
            padding: 30px 20px;
            border-radius: 8px;
            text-align: center;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            border-top: 3px solid #003366;
            transition: transform 0.3s ease;
        }
        .advantage-item:hover {
            transform: translateY(-5px);
        }
        .advantage-item i {
            font-size: 36px;
            color: #003366;
            margin-bottom: 20px;
        }
        .advantage-item h4 {
            font-size: 18px;
            margin-bottom: 15px;
            color: #003366;
        }
        .advantage-item p {
            color: #666;
            font-size: 14px;
            line-height: 1.6;
        }
        /* Contact Section */
        .contact {
            padding: 40px 0;
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .contact h3 {
            font-size: 24px;
            text-align: center;
            margin-bottom: 30px;
            color: #003366;
        }
        .contact-info {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            text-align: center;
            padding: 0 10px;
        }
        .contact-item {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
        }
        .contact-item i {
            font-size: 24px;
            color: #003366;
        }
        .contact-item p {
            font-size: 16px;
        }
        .contact-item a {
            color: #003366;
            text-decoration: none;
            transition: color 0.3s;
        }
        .contact-item a:hover {
            color: #0052a3;
            text-decoration: underline;
        }
        /* Category tabs */
        .category-tabs {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }
        .tab-btn {
            padding: 10px 20px;
            background-color: #f1f5f9;
            border: none;
            border-radius: 4px;
            color: #003366;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .tab-btn.active {
            background-color: #003366;
            color: #fff;
        }
        .tab-btn:hover:not(.active) {
            background-color: #e1eaf1;
        }
        /* Responsive Design */
        @media (max-width: 992px) {
            .advantage-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .contact-info {
                grid-template-columns: repeat(1, 1fr);
                gap: 20px;
            }
            .contact-item {
                justify-content: center;
            }
        }
        @media (max-width: 768px) {
            .section-title h2 {
                font-size: 28px;
            }
            .category-tabs {
                gap: 5px;
            }
            .tab-btn {
                padding: 8px 15px;
                font-size: 13px;
            }
        }
        @media (max-width: 480px) {
            .product-table th, .product-table td {
                padding: 10px 8px;
                font-size: 13px;
            }
            .advantage-list {
                grid-template-columns: repeat(1, 1fr);
            }
            body {
                padding: 10px;
            }
            .section-title h2 {
                font-size: 24px;
            }
        }