/* 基础重置与变量 */
        :root {
            --bg-color: #0f172a; /* 深蓝黑背景 */
            --card-bg: #1e293b;
            --text-main: #f8fafc;
            --text-sub: #94a3b8;
            --accent: #3b82f6; /* 科技蓝 */
            --accent-hover: #2563eb;
            --border: #334155;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { 
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-color); 
            color: var(--text-main); 
            line-height: 1.6;
        }
        a { text-decoration: none; color: inherit; transition: 0.3s; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* 第一行：顶栏 */
        header {
            padding: 20px 0;
            border-bottom: 1px solid var(--border);
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            background: linear-gradient(90deg, var(--accent), #8b5cf6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .user-links a {
            margin-left: 20px;
            color: var(--text-sub);
            font-size: 0.9rem;
        }
        .user-links a:hover { color: var(--accent); }

        /* 第二行：导航 */
        nav {
            padding: 15px 0;
            background: rgba(15, 23, 42, 0.8);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid var(--border);
        }
        .nav-links { display: flex; gap: 30px; }
        .nav-links a {
            color: var(--text-sub);
            font-weight: 500;
            padding: 5px 0;
            border-bottom: 2px solid transparent;
        }
        .nav-links a:hover, .nav-links a.active {
            color: var(--text-main);
            border-bottom-color: var(--accent);
        }

        /* 内容区通用 */
        section { padding: 60px 0; }
        .section-title {
            font-size: 1.8rem;
            margin-bottom: 40px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .section-title::before {
            content: '';
            width: 4px;
            height: 24px;
            background: var(--accent);
            border-radius: 2px;
        }

        /* 商品卡片网格 */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
        }
        .product-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 25px;
            transition: transform 0.3s, border-color 0.3s;
        }
        .product-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
        }
        .product-card h3 { font-size: 1.2rem; margin-bottom: 10px; }
        .product-card .specs { color: var(--text-sub); font-size: 0.9rem; margin-bottom: 15px; }
        .product-card .price { color: var(--accent); font-size: 1.4rem; font-weight: 700; margin-bottom: 20px; }
        .product-card .price span { font-size:0.8rem;color:var(--text-sub); }
        .btn-buy {
            display: block;
            width: 100%;
            padding: 10px;
            background: var(--accent);
            color: #fff;
            text-align: center;
            border-radius: 6px;
            font-weight: 600;
        }
        .btn-buy:hover { background: var(--accent-hover); }

        /* 第三版块：收款码布局 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .qr-group { display: flex; gap: 20px; flex-wrap: wrap; }
        .qr-item { text-align: center; }
        .qr-placeholder {
            width: 160px;
            height: 160px;
            background: #fff;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #333;
            font-size: 0.8rem;
            margin-bottom: 8px;
        }
        .qr-label { font-size: 0.9rem; color: var(--text-sub); }

        /* 底部 */
        footer {
            border-top: 1px solid var(--border);
            padding: 40px 0;
            text-align: center;
            color: var(--text-sub);
            font-size: 0.85rem;
            margin-top: 40px;
        }
		/* 商品卡片专属浅色主题 */
		.product-card {
			background: #e2e8f0 !important; /* 浅灰背景 */
			color: #1e293b;                 /* 卡片内主文字变深 */
		}
		.product-card h3 {
			color: #1e293b;
		}
		.product-card .specs {
			color: #64748b;                 /* 卡片内副文字变中灰 */
		}


        /* 购买页内容区块通用样式 */
        .detail-section {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 30px;
            margin-bottom: 30px;
        }
        .detail-section h2 {
            font-size: 1.5rem;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--border);
            color: var(--text-main);
        }

        /* 参数列表样式 */
        .specs-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
        }
        .spec-item {
            display: flex;
            align-items: center;
            padding: 10px;
            background: #e2e8f0;
            border-radius: 8px;
            color: #1e293b;
        }
        .spec-icon { font-size: 1.2rem; margin-right: 15px; color: var(--accent); width: 24px; text-align: center; }
        .spec-label { font-weight: 600; min-width: 80px; color: #475569; }
        .spec-value { font-weight: 500; }

        /* 购买与价格区块 */
        .purchase-bar {
            background: #e2e8f0;
            border-radius: 12px;
            padding: 25px 30px;
            margin-bottom: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .purchase-price {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--accent);
        }
        .purchase-price span {
            font-size: 1rem;
            color: #64748b;
            font-weight: 400;
        }
        .btn-buy-large {
            display: inline-block;
            padding: 15px 40px;
            background: var(--accent);
            color: #fff;
            text-align: center;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: 0.3s;
        }
        .btn-buy-large:hover { background: var(--accent-hover); }

        /* 产品描述与要求 */
        .description-content, .requirements-content { color: #cbd5e1; line-height: 1.8; }
        .requirements-content ul { list-style-type: disc; padding-left: 20px; margin-top: 10px; }
        .requirements-content li { margin-bottom: 10px; }


        /* 移动端适配 */
        @media (max-width: 768px) {
            .nav-links { gap: 15px; font-size: 0.9rem; overflow-x: auto; }
            .contact-grid { grid-template-columns: 1fr; text-align: center; }
            .qr-group { justify-content: center; }
            .section-title { font-size: 1.4rem; }

            .specs-list { grid-template-columns: 1fr; }
            .purchase-bar { flex-direction: column; gap: 20px; text-align: center; }
            .btn-buy-large { width: 100%; }
        }