.banner{
            background: url(/images/banner/pro-ban.png) no-repeat center center;
        }
        @media (max-width: 768px) {
            .banner{
                background: url(/images/banner/mob/pro.jpg) no-repeat center center;
            }   
        }
        :root {
            --primary: #D62A29;
            --primary-hover: #b50f15;
            --primary-rgb: 215, 25, 32;
            --text-dark: #1e2a3a;
            --text-light: #5b6e8c;
            --border: #e9edf2;
            --shadow-md: 0 12px 28px rgba(0, 0, 0, 0.08);
            --transition: all 0.25s ease;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: #fff;
            padding: 12px 28px;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            min-width: 160px;
            text-decoration: none;
        }
        .btn-primary:hover {
            color: #fff; 
            box-shadow: 0 8px 18px rgba(215, 25, 32, 0.25);
        }
        /* banner 简易风格 */
        .product-sidebar {
            border: 1px solid var(--border);
            overflow: hidden;
            background: white;
        }
        .sidebar-title {
            background: var(--primary);
            background: url(/images/pro/bj2.png);
            background-size: 100% 100%;
            color: white;
            font-weight: 700;
            padding: 18px 24px;
            font-size: 1.2rem;
            position: relative;
        }
        .sidebar-title::after {
            content: ' ';
            width: 21px;
            height: 21px;
            background: url(/images/pro/tb1.png) no-repeat center center;
            background-size: 100%;
            position: absolute;
            right: 30px;
            top: 50%;
            pointer-events: none;
            transform: translateY(-50%);
        }
        .sidebar-menu a {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 24px;
            border-bottom: 1px solid var(--border);
            font-weight: 500;
            transition: 0.2s;
            cursor: pointer;
            color: var(--text-dark);
            text-decoration: none;
        }
        .sidebar-menu a:hover,
        .sidebar-menu a.active {
            background: rgba(var(--primary-rgb), 0.05);
            border-right: 4px solid var(--primary);
        }
        .product-intro {
            background: url(/images/pro/bj1.png);
            background-size: 100% 100%;
            border: 1px solid var(--border);
            padding: 40px 70px 50px 70px;
        }
        .product-intro h2 {
            font-size: clamp(26px, 3vw, 38px);
            font-weight: 700;
            margin-bottom: 20px;
        }
        .feature-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .feature-item {
            background: #f8fafc;
            padding: 24px;
            height: 100%;
            position: relative;
            border-bottom: 4px solid var(--primary);
            transition: border-color 0.4s ease, box-shadow 0.3s ease;
        }
        .feature-item:hover {
            box-shadow: 0 8px 24px rgba(var(--primary-rgb), 0.12);
        }
        .feature-item h3 { font-weight: 700; margin-bottom: 10px; }

        .product-list {
            margin: 40px 0;
        }
        .product-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .product-grid-item {
            min-width: 0;
        }
        .product-card {
            background: #fff;
            overflow: hidden;
            transition: var(--transition);
            height: 440px;
            display: flex;
            flex-direction: column;
        }
        .product-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            /*border-color: transparent;*/
            border-bottom: 4px solid var(--primary);
        }
        .product-thumb {
            height: 230px;
            /*background: #fefaf9;*/
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .product-thumb img { height: 100%; object-fit: contain; max-width: 100%; transition: all 0.3s ease;}
        .product-info { padding: 20px 24px 0 24px; flex: 1; text-align: center;}
        .product-name { font-size: 24px; font-weight: 700; margin-bottom: 8px; transition: color 0.3s ease;}
        .product-category {
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 16px;
        }
        .product-spec {
            background: #f8f9fc;
            padding: 10px 14px;
            margin-bottom: 8px;
            color: var(--4D);
            text-align: left;
            overflow: hidden;
            white-space: nowrap;
            text-overflow: ellipsis;
        }
        .product-btn { margin-top: 24px; text-align: center; animation: fadeUp2 0.4s forwards;}

        .product-card:hover  img{
            transform: scale(1.05);
        }

        /* 产品信息容器 - 常态显示规格 */
        .product-info .product-spec {
            display: block; /* 常态显示 */
        }

        .product-info .product-btn {
            display: none; /* 常态隐藏按钮 */
            height: 112px;
        }

        /* 悬停时 - 隐藏规格，显示按钮 */
        .product-card:hover .product-info .product-spec {
            display: none;
        }

        .product-card:hover .product-info .product-btn {
            display: block;
            margin-top: 24px;
            text-align: center;
        }
        .product-card:hover .product-name {
            color: var(--primary);
        }

        /* 侧边栏sticky */
        .sidebar-sticky-wrapper {
            position: sticky;
            top: 120px;
        }
        /* 卡片入场动画 */
        .product-card {
            opacity: 0;
            transform: translateY(12px);
            animation: fadeUp 0.4s forwards;
        }
        @keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }

        @keyframes fadeUp2 {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ========== 新增手机下拉分类样式 ========== */
        .mobile-category-select {
            display: none;
            width: 100%;
            padding: 14px 16px;
            font-size: 16px;
            border: 1px solid var(--border);
            margin-bottom: 20px;
            color: var(--text-dark);
            -webkit-appearance: none;
            -moz-appearance: none;
            appearance: none;
            background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%235b6e8c' viewBox='0 0 16 16'%3e%3cpath d='M8 11L3 6h10l-5 5z'/%3e%3c/svg%3e");
            background-repeat: no-repeat;
            background-position: right 14px center;
            background-size: 16px;
        }
        .mobile-category-select::-ms-expand {
            display: none;
        }

        /* PC端*/
        @media (min-width: 992px) {
            .row.g-4 {
                display: flex;
                flex-wrap: nowrap; /* 强制不换行 */
                gap: 60px;
                margin-left: 0;
                margin-right: 0;
            }
            .row.g-4 > * {
                margin-left: 0;
                margin-right: 0;
                padding-left: 0;
                padding-right: 0;
                flex: 0 0 auto; /* 防止伸缩 */
            }
            .col-lg-3 {
                width: 340px;
                flex-shrink: 0;
            }
            .col-lg-9 {
                width: calc(100% - 340px - 60px);
                flex-shrink: 0;
            }
        }

        @media (max-width: 1399px) {
            .product-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .feature-row {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 1099px) {
            .feature-row {
                grid-template-columns: repeat(1, 1fr);
            }
        }

        @media (max-width: 767px) {
            .product-card{
                height: auto;
            }
            .product-thumb{
                height: auto;
            }
            .product-spec{
                overflow: hidden;
            }
            /* 手机端隐藏左侧侧边栏菜单 */
            .col-lg-3,.feature-row {
                display: none !important;
            }
            /* 显示下拉选择框 */
            .mobile-category-select {
                display: block;
            }
            .product-intro { padding: 24px;display: flex;justify-content: center;}
            .product-thumb img { height: 160px; }
            .product-name { font-size: 1.4rem; }
            .product-grid{
                gap: 10px;
            }

            .product-intro h2{
                margin: 0;
            }
            .product-info{
                padding: 10px;
            }
            .product-intro h2::after {
                content: '';
                display: block;
                width: 80%;
                height: 4px;
                background: var(--red);
                margin: 12px 0 12px 10%;
            }

            .product-info .product-btn{
                height: 78px;
            }
        }