/* 全局字体放大：根字号18px */
        html {
            font-size: 18px;
        }

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

        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #ffffff;
            color: #222;
            line-height: 1.55;
            padding: 24px 16px;
        }

        .description {
            max-width: 1000px;
            margin: 0 auto;
        }

        /* 模块通用标题 */
        .module-title {
            font-size: 1.45rem;
            font-weight: 600;
            margin: 28px 0 12px 0;
            padding-bottom: 6px;
            border-bottom: 2px solid #e0e0e0;
        }

        /* 产品主标题 */
        .product-title {
            font-size: 2.1rem;
            font-weight: 700;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }

        .product-subtitle {
            font-size: 1.15rem;
            font-weight: 500;
            color: #555;
            margin-bottom: 14px;
        }

        .intro-text {
            color: #444;
            margin-bottom: 24px;
            font-size: 1.05rem;
        }

        /* 四宫格布局 */
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin: 16px 0 24px;
        }

        .grid-item {
            border: 1px solid #d0d0d0;
            border-radius: 6px;
            padding: 18px 16px;
            background: #fafafa;
        }

        .grid-item .number {
            display: block;
            font-size: 0.85rem;
            font-weight: 700;
            color: #888;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
        }

        .grid-item h3 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: #111;
        }

        .grid-item p {
            font-size: 0.9rem;
            color: #555;
            line-height: 1.55;
            margin-bottom: 8px;
        }

        .grid-item ul {
            list-style: none;
            padding-left: 0;
            margin-top: 4px;
        }

        .grid-item ul li {
            font-size: 0.85rem;
            color: #555;
            padding: 2px 0 2px 18px;
            position: relative;
        }

        .grid-item ul li::before {
            content: "•";
            position: absolute;
            left: 4px;
            color: #777;
        }

        /* 规格表格 */
        .spec-table {
            width: 100%;
            border-collapse: collapse;
            margin: 12px 0 20px;
            font-size: 0.95rem;
        }

        .spec-table th,
        .spec-table td {
            text-align: left;
            padding: 9px 12px;
            border: 1px solid #d0d0d0;
        }

        .spec-table th {
            background: #f0f0f0;
            font-weight: 600;
        }

        /* 材料列表 */
        .material-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin: 12px 0 20px;
        }

        .material-item {
            border: 1px solid #d0d0d0;
            border-radius: 6px;
            padding: 16px;
            background: #fafafa;
        }

        .material-item h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .material-item ul {
            list-style: none;
            padding-left: 0;
            margin-top: 6px;
        }

        .material-item li {
            font-size: 0.88rem;
            color: #444;
            padding: 2px 0 2px 20px;
            position: relative;
        }

        .material-item li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: #2a7a2a;
            font-weight: 700;
        }

        /* 颜色选项 */
        .color-options {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin: 12px 0 20px;
        }

        .color-box {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            border: 1px solid #ccc;
            border-radius: 4px;
            padding: 6px 12px;
            font-size: 0.9rem;
            background: #fff;
        }

        .color-dot {
            width: 16px;
            height: 16px;
            border-radius: 50%;
            display: inline-block;
        }

        .dot-blue {
            background: #1e88e5;
        }
        .dot-green {
            background: #43a047;
        }
        .dot-purple {
            background: #8e24aa;
        }
        .dot-pink {
            background: #ec407a;
        }

        /* 适用场景 - 双列网格 */
        .venue-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
            margin: 12px 0 20px;
        }

        .venue-item {
            border: 1px solid #d0d0d0;
            border-radius: 6px;
            padding: 12px 14px;
            background: #fafafa;
            font-size: 0.95rem;
            font-weight: 500;
            color: #222;
        }

        /* 响应式 */
        @media (max-width: 768px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .material-list {
                grid-template-columns: 1fr;
            }
            .venue-list {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 480px) {
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .product-title {
                font-size: 1.8rem;
            }
        }