:root {
            --primary-color: #c0392b; /* 主色调 - 红色 */
            --secondary-color: #FF8C00; /* 辅助色 - 橙色 */
            --text-color: #333; /* 文本颜色 */
            --background-color: #f9f9f9; /* 背景色 */
            --card-bg: #fff; /* 卡片背景色 */
            --border-radius: 8px; /* 圆角 */
            --shadow: 0 4px 8px rgba(0, 0, 0, 0.1); /* 阴影 */
            --spider-web-color: rgba(128, 128, 128, 0.1); /* 蜘蛛网背景色 */
            --base-font-size: 16px; /* 基础字体大小 */
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: Helvetica, Arial, sans-serif;
        }

        .container {
            background-color: var(--background-color);
            color: var(--text-color);
            padding: 20px 10px;
            position: relative;
            overflow-x: hidden;
            font-size: var(--base-font-size);
            line-height: 1.6;
        }

        /* 蜘蛛网背景 */
        .container::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: radial-gradient(var(--spider-web-color) 1px, transparent 1px),
                              radial-gradient(var(--spider-web-color) 1px, transparent 1px);
            background-size: 50px 50px;
            background-position: 0 0, 25px 25px;
            z-index: -1;
        }

        .grid-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 20px;
        }

        .module {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 25px;
            position: relative;
            overflow: hidden;
            animation: fadeIn 0.5s ease-in-out;
            align-self: flex-start;
        }

        .title {
            font-size: clamp(1.5rem, 3vw, 2rem);
            margin-bottom: 20px;
            color: var(--primary-color);
            position: relative;
            padding-bottom: 10px;
        }

        .title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

        /* 尺寸图表模块 */
        .size-options {
            display: flex;
            justify-content: center;
            gap: 8px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .size-btn {
            padding: 8px 16px;
            border: 1px solid #ddd;
            border-radius: 20px;
            background-color: #fff;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
            font-size: 1rem;
        }

        .size-btn.active {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        .size-btn:hover:not(.active) {
            background-color: #f5f5f5;
            transform: scale(1.05);
            transition: all 0.3s ease;
        }

        .size-details {
            margin-bottom: 25px;
        }

        .size-item {
            display: flex;
            justify-content: space-between;
            padding: 12px 15px;
            border-bottom: 1px solid #eee;
        }

        .size-label {
            font-weight: 500;
        }

        .module .size-details .size-value {
            color: var(--primary-color);
            font-weight: bold;
            font-size: 1.1rem;
        }

        .unit-conversion {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-bottom: 20px;
        }

        .unit-btn {
            padding: 8px 16px;
            border-radius: 20px;
            border: none;
            cursor: pointer;
            font-weight: 500;
            transition: all 0.3s ease;
            font-size: 1rem;
        }

        .unit-btn.active {
            background-color: var(--primary-color);
            color: white;
        }

        .unit-btn:not(.active) {
            background-color: #e0e0e0;
            color: #666;
        }

        /* 产品描述模块 */
        .product-description {
            line-height: 1.6;
        }

        .description-section {
            margin-bottom: 25px;
        }

        .description-title {
            font-size: clamp(1.2rem, 2vw, 1.5rem);
            color: var(--secondary-color);
            margin-bottom: 10px;
            font-weight: bold;
        }

        .highlight {
            color: #cc0000 !important;
            font-weight: bold !important;
            text-decoration: none !important;
        }

        /* 特点模块 */
        .features-list {
            list-style-type: none;
            padding-left: 0;
            color: #333;
            margin: 0;
        }
        .features-list li {
            position: relative;
            padding: 12px 0 12px 20px;
            margin-bottom: 12px;
            border-bottom: 1px solid #eee;
            line-height: 1.6;
        }
        .features-list li::before {
            content: '•';
            color: #cc0000;
            font-size: 1.8em;
            position: absolute;
            left: 2px;
            top: 50%;
            transform: translateY(-50%);
            z-index: 1;
        }

        .features-list li:last-child {
            border-bottom: none;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .grid-container {
                grid-template-columns: 1fr;
            }

            .module {
                grid-column: 1;
                grid-row: auto;
            }
        }

        /* 动画关键帧 */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @media (max-width: 420px) {
            .module {
                padding: 15px;
            }

            .size-btn {
                padding: 6px 12px;
                font-size: 0.9rem;
            }

            .size-item {
                padding: 10px;
            }

            .unit-btn {
                padding: 6px 12px;
                font-size: 0.9rem;
            }
        }