* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: #f5f7fc;
            color: #1e2a3e;
            line-height: 1.5;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 头部导航 */
        .header {
            background-color: #0b2b3b;
            color: white;
            padding: 16px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .logo {
            cursor: pointer;
            transition: opacity 0.2s;
        }
        .logo:hover {
            opacity: 0.9;
        }
        .logo h1 {
            font-size: 1.6rem;
            font-weight: 700;
            letter-spacing: -0.3px;
        }
        .logo p {
            font-size: 0.8rem;
            color: #9bb7c9;
        }
        .nav a {
            color: white;
            text-decoration: none;
            margin-left: 28px;
            font-weight: 500;
            transition: 0.2s;
            padding-bottom: 4px;
            border-bottom: 2px solid transparent;
            cursor: pointer;
        }
        .nav a:hover, .nav a.active {
            border-bottom-color: #f0b429;
            color: #f0b429;
        }

        /* 分类导航栏 (新) */
        .category-nav {
            background: white;
            border-radius: 60px;
            display: inline-flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 8px;
            padding: 8px 16px;
            margin-bottom: 32px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.03);
            border: 1px solid #eef2f9;
        }
        .category-btn {
            background: transparent;
            border: none;
            padding: 10px 28px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all 0.2s;
            color: #4a627a;
            font-family: inherit;
        }
        .category-btn.active-cat {
            background-color: #f0b429;
            color: #1e2a3e;
            box-shadow: 0 4px 8px rgba(240,180,41,0.2);
        }
        .category-btn:hover:not(.active-cat) {
            background-color: #eef3fa;
        }

        /* 通用区块 */
        .section {
            padding: 60px 0;
            border-bottom: 1px solid #e2e8f0;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: #0f2b3d;
        }
        .section-sub {
            color: #4a627a;
            margin-bottom: 40px;
            font-size: 1.1rem;
            border-left: 4px solid #f0b429;
            padding-left: 16px;
        }

        /* 产品网格 */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 20px;
        }
        .product-card {
            background: white;
            border-radius: 28px;
            overflow: hidden;
            box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05);
            transition: transform 0.25s ease, box-shadow 0.3s;
            border: 1px solid #edf2f7;
        }
        .product-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 30px -12px rgba(0,0,0,0.12);
        }
        .product-img {
            height: 220px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-size: contain;
            background-position: center;
            background-repeat: no-repeat;
            background-color: #fafcff;
            margin: 12px 12px 0 12px;
            border-radius: 20px;
        }
        .product-info {
            padding: 24px;
        }
        .product-title {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .product-desc {
            color: #4a5568;
            margin-bottom: 16px;
            font-size: 0.9rem;
            line-height: 1.4;
        }
        .product-price {
            font-size: 1.5rem;
            font-weight: 800;
            color: #c2410c;
            margin-bottom: 20px;
        }
        .buy-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 8px;
        }
        .btn {
            padding: 8px 16px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.85rem;
            cursor: pointer;
            border: none;
            transition: 0.2s;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background-color: #f1f5f9;
            color: #1e293b;
        }
        .btn-primary {
            background-color: #f0b429;
            color: #1e2a3e;
        }
        .btn-outline {
            background: transparent;
            border: 1px solid #cbd5e1;
        }
        .btn-sm {
            font-size: 0.8rem;
            padding: 6px 12px;
        }
        .btn:hover {
            transform: translateY(-2px);
            filter: brightness(0.96);
        }

        /* 返回首页按钮 */
        .back-home-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: white;
            border: 1px solid #e2e8f0;
            padding: 10px 20px;
            border-radius: 40px;
            margin-bottom: 28px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
            color: #0b2b3b;
        }
        .back-home-btn:hover {
            background: #f0b429;
            border-color: #f0b429;
            color: #1e2a3e;
        }

        /* 模态框 */
        .modal {
            display: none;
            position: fixed;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background-color: rgba(0,0,0,0.7);
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }
        .modal-content {
            background: white;
            padding: 28px;
            border-radius: 32px;
            max-width: 320px;
            text-align: center;
            animation: fadeInUp 0.2s;
        }
        .qr-img {
            width: 180px;
            height: 180px;
            background: #eef2ff;
            margin: 16px auto;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            color: #1e293b;
            border: 1px solid #ddd;
        }
        .close-modal {
            margin-top: 16px;
            background: #e2e8f0;
            border: none;
            padding: 8px 18px;
            border-radius: 40px;
            cursor: pointer;
        }
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(20px);}
            to { opacity: 1; transform: translateY(0);}
        }

        /* 证书页面样式 */
        .cert-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin: 40px 0;
        }
        .cert-card {
            background: white;
            border-radius: 24px;
            padding: 24px 20px;
            text-align: center;
            box-shadow: 0 8px 20px rgba(0,0,0,0.03);
            border: 1px solid #eef2f9;
            transition: all 0.2s;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .cert-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 24px -12px rgba(0,0,0,0.1);
        }
        .cert-icon {
            font-size: 2.8rem;
            margin-bottom: 12px;
        }
        .cert-title {
            font-weight: 800;
            font-size: 1.2rem;
            margin: 12px 0 8px;
        }
        .cert-description {
            font-size: 0.85rem;
            margin: 12px 0;
            line-height: 1.5;
            flex: 1;

			 min-height: 70px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
        }
        .download-link {
            display: inline-block;
            margin-top: 16px;
            color: #f0b429;
            font-weight: 600;
            text-decoration: none;
            border-bottom: 1px dashed #f0b429;
            cursor: pointer;
        }
        .footer {
            background: #0b2b3b;
            color: #cbd5e6;
            padding: 40px 0;
            text-align: center;
            font-size: 0.85rem;
        }
        .contact-bar {
            background: #eef3fa;
            padding: 12px 20px;
            border-radius: 60px;
            display: inline-flex;
            gap: 20px;
            flex-wrap: wrap;
            justify-content: center;
            margin-top: 20px;
        }
        @media (max-width: 700px) {
            .nav a { margin-left: 16px; }
            .section-title { font-size: 1.6rem; }
            .category-btn { padding: 6px 18px; font-size: 0.85rem; }
        }
        .badge {
            background-color: #e9f5e9;
            color: #2e6b2f;
            border-radius: 20px;
            padding: 4px 12px;
            font-size: 0.7rem;
            display: inline-block;
            margin-bottom: 10px;
        }
        .trust-banner {
            background: #eef3fa;
            border-radius: 28px;
            padding: 28px;
            margin-bottom: 40px;
            text-align: center;
        }
        .cert-auth-strip {
            background: #f9f3e8;
            padding: 16px 24px;
            border-radius: 60px;
            display: inline-flex;
            gap: 20px;
            flex-wrap: wrap;
            justify-content: center;
            margin-bottom: 30px;
            font-weight: 500;
        }
        .fade-transition {
            transition: opacity 0.2s ease;
        }