/* =========================
   产品中心下拉菜单样式
========================= */
.nav .menu .menu-item.product-menu .submenu.product-submenu {
    position: fixed;
    top: 4.375rem;
    left: 0;
    width: 100%;
    background: #fff;
    box-shadow: 0 0.125rem 0.5rem rgba(0, 0, 0, 0.08);
    padding: 0;
    opacity: 0;
    visibility: hidden;
    display: none;
    transition: all 0.25s ease;
    z-index: 99;
    border-top: 0.0625rem solid #f0f0f0;
    max-height: calc(100vh - 4.375rem);
    overflow: hidden;
}

.nav .menu .menu-item.product-menu:hover .submenu.product-submenu {
    opacity: 1;
    visibility: visible;
    display: block;
}

.nav .menu .menu-item.product-menu .product-submenu-inner {
    max-width: calc(100% - 20rem);
    margin: 0 0 0 20rem;
    display: flex;
    justify-content: flex-start;
    padding: 2.5rem 0;
    gap: 4rem;
    min-height: 25rem;
    transition: min-height 0.3s ease;
}

.nav .menu .menu-item.product-menu .product-submenu-inner.tall {
    min-height: 28rem;
}

.nav .menu .menu-item.product-menu .product-submenu-col.product-col-left {
    width: 18rem;
    min-width: 16rem;
    max-width: 20rem;
    background: #f8f9fa;
    padding: 0;
    margin: -2.5rem 0;
    margin-left: 4rem;
    padding-left: 3rem;
    border-radius: 0;
    box-sizing: border-box;
    flex-shrink: 0;
    align-self: stretch;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 2.5rem;
}

.nav .menu .menu-item.product-menu .product-col-left a {
    font-size: 0.875rem;
    color: #666;
    text-decoration: none;
    padding: 0.75rem 3rem 0.75rem 3rem;
    margin-bottom: 0.125rem;
    border-radius: 0;
    transition: all 0.15s ease;
    position: relative;
    display: block;
    background: transparent url('../images/arrow-icon.svg') right center no-repeat;
    background-size: 0 0;
}

.nav .menu .menu-item.product-menu .product-col-left a:hover {
    color: #005AAA;
    background: #f0f7ff url('../images/arrow-icon.svg') calc(100% - 0.75rem) center no-repeat;
    background-size: 0.9375rem 0.25rem;
}

.nav .menu .menu-item.product-menu .product-col-left a.active {
    color: #005AAA;
    background: #fff url('../images/arrow-icon.svg') calc(100% - 0.75rem) center no-repeat;
    background-size: 0.9375rem 0.25rem;
    font-weight: 500;
}

/* 隐藏产品中心下拉菜单的蓝色下划线 */
.nav .menu .menu-item.product-menu .product-col-left a::after {
    display: none !important;
}

.nav .menu .menu-item.product-menu .content-col a::after {
    display: none !important;
}

/* 内容区域 */
.nav .menu .menu-item.product-menu .product-content-area {
    flex: 0 1 40%;
    min-height: 15rem;
    min-width: 15rem;
    max-width: 30rem;
}

.nav .menu .menu-item.product-menu .content-panel {
    display: none;
    flex-direction: row;
    gap: 3rem;
    padding-right: 1rem;
    padding-bottom: 1.5rem;
    flex-wrap: nowrap;
}

.nav .menu .menu-item.product-menu .content-panel.active {
    display: flex;
}

.nav .menu .menu-item.product-menu .content-panel.active {
    display: flex;
}

.nav .menu .menu-item.product-menu .content-col {
    min-width: 14rem;
    max-width: 16rem;
    display: flex;
    flex-direction: column;
}

.nav .menu .menu-item.product-menu .content-panel-bonder {
    min-height: 22rem;
}



.nav .menu .menu-item.product-menu .content-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: #262626;
    text-decoration: none;
    padding: 0.5rem 0.5rem 0.375rem;
    margin-bottom: 1rem;
    margin-top: 0.625rem;
    border-bottom: 0.0625rem solid #e8e8e8;
    display: block;
    transition: all 0.15s ease;
}

.nav .menu .menu-item.product-menu .content-title:hover {
    color: #005AAA;
}

.nav .menu .menu-item.product-menu .content-col h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: #262626;
    margin: 0.375rem 0 0.625rem 0;
    padding: 0.5rem 0.5rem 0.375rem;
    border-bottom: 0.0625rem solid #e8e8e8;
    cursor: pointer;
}

.nav .menu .menu-item.product-menu .content-col a {
    font-size: 0.75rem;
    color: #888;
    text-decoration: none;
    padding: 0.4375rem 0.5rem;
    margin-bottom: 0;
    border-radius: 0;
    transition: all 0.15s ease;
    position: relative;
    display: block;
}

.nav .menu .menu-item.product-menu .content-col a:hover {
    color: #005AAA;
}

.nav .menu .menu-item.product-menu .product-recommend {
    min-width: 14rem;
    max-width: 15rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    border-left: 0.0625rem solid #e8e8e8;
    flex-shrink: 0;
    align-self: flex-start;
}

.nav .menu .menu-item.product-menu .recommend-title {
    font-size: 1rem;
    font-weight: 600;
    color: #005AAA;
    margin-bottom: 0.5rem;
}

.nav .menu .menu-item.product-menu .recommend-model {
    font-size: 0.875rem;
    font-weight: 500;
    color: #333;
    margin-bottom: 1rem;
}

.nav .menu .menu-item.product-menu .recommend-image {
    width: 100%;
    max-width: 14rem;
    margin-bottom: 1rem;
}

.nav .menu .menu-item.product-menu .recommend-image img {
    width: 100%;
    height: auto;
    object-fit: contain;
}

.nav .menu .menu-item.product-menu .recommend-more {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.78125rem;
    color: #666;
    cursor: pointer;
    transition: color 0.15s ease;
}

.nav .menu .menu-item.product-menu .recommend-more:hover {
    color: #005AAA;
}

.nav .menu .menu-item.product-menu .recommend-more img {
    width: 1rem;
    height: auto;
}

/* =========================
   页面标题样式
========================= */
.page-header {
    background: #000b5a url('../images/n-banner3.jpg') center/cover no-repeat;
    padding: calc(5rem + 3vw) 5% calc(2.5rem + 1vw);
    min-height: 28.125rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    position: relative;
}

.page-header .page-header-inner {
    max-width: 100rem;
    margin: 0 auto;
    width: 100%;
}

.page-header-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    margin: 0 0 0.625rem 0;
    letter-spacing: 0.125rem;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
    margin: 0 0 1.5rem 0;
}

.page-header-subtitle {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
}

/* =========================
   产品分类标签样式
========================= */
.product-tabs {
    background: #fff;
    border-bottom: 0.0625rem solid #eee;
}

.product-tabs-inner {
    max-width: 100rem;
    margin: 0 auto;
    display: flex;
    padding: 0 5%;
    position: relative;
}

.tab-item {
    padding: 1.5625rem 2.5rem;
    font-size: 1rem;
    color: #666;
    cursor: pointer;
    transition: color 0.3s ease;
    position: relative;
}

.tab-item:hover {
    color: #005AAA;
}

.tab-item.active {
    color: #005AAA;
    font-weight: 500;
}

.tab-item.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50%;
    height: 0.1875rem;
    background: #005AAA;
}

/* =========================
   产品列表区域样式
========================= */
.product-list {
    padding: 5rem 5%;
    background: #f8f9fa;
}

.product-list-inner {
    max-width: 100rem;
    margin: 0 auto;
    display: flex;
    gap: 3rem;
}

.product-sidebar {
    width: 14rem;
    flex-shrink: 0;
}

.product-nav {
    background: #fff;
    border-radius: 0.5rem;
    padding: 0;
    box-shadow: 0 0.125rem 0.5rem rgba(0, 0, 0, 0.06);
    overflow: hidden;
}

.product-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.product-nav li {
    margin-bottom: 0;
}

.product-nav .nav-group {
    border-bottom: 0.0625rem solid #f0f0f0;
}

.product-nav .nav-group:last-child {
    border-bottom: none;
}

.product-nav .nav-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: background 0.2s ease;
}

.product-nav .nav-group-header:hover {
    background: #f8f8f8;
}

.product-nav .nav-group-header.active {
    background: #005AAA;
}

.product-nav .nav-group-header.active .nav-group-title {
    color: #fff;
}

.product-nav .nav-group-header.active .nav-group-icon {
    background: #fff;
    color: #003399;
}

.product-nav .nav-group-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: #333;
    margin: 0;
}

.product-nav .nav-group-icon {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: #e8e8e8;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: #666;
    transition: all 0.2s ease;
}

.product-nav .nav-group-content {
    display: none;
    background: #fff;
}

.product-nav .nav-group.active .nav-group-content {
    display: block;
}

.product-nav .nav-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    transition: background 0.2s ease;
}

.product-nav .nav-item:hover {
    background: #f8f9fa;
}

.product-nav .nav-item a {
    flex: 1;
    color: #555;
    text-decoration: none;
    font-size: 0.875rem;
}

.product-nav .nav-item-icon {
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 0.25rem;
    border: 0.0625rem solid #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.5625rem;
    color: #999;
}

.product-nav .nav-item-sub {
    padding: 0.75rem 1rem;
    font-size: 0.75rem;
    font-weight: 400;
    color: #333;
    cursor: pointer;
    transition: background 0.2s ease;
}
.product-nav .nav-item-sub a{
    color:#333
}
.product-nav .nav-item-sub:hover {
    background: #f8f9fa;
}

.product-content {
    flex: 1;
    min-width: 0;
}

.product-section-title {
    font-size: 2rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 0.9375rem;
	text-align:center;
}

.product-section-desc {
    font-size: 1rem;
    color: #666;
    line-height: 1.8;
    margin-bottom: 3.125rem;
    text-align:center;
    max-width: 64rem;
    margin-left: auto;
    margin-right: auto;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.875rem;
}

.product-card {
    display: flex;
    flex-direction: column;
    min-height: 32.5rem;
    height: 100%;
    padding: 1.875rem 1.5625rem;
    border: 0.0625rem solid #eee;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transition-delay: 0.1s;
    justify-content: space-between;
    transform: translateY(0);
    background: #fff;
}

.product-card:hover {
    box-shadow: 0 0.9375rem 2.5rem rgba(0, 90, 170, 0.12);
    border-color: #005AAA;
    transform: translateY(-0.5rem);
}

.product-card-header {
    margin-bottom: 0.75rem;
}

.product-card-title {
    font-size: 1.375rem;
    font-weight: 600;
    color: #333;
    margin: 0 0 0.3125rem 0;
    transition: color 0.3s ease;
}

.product-card:hover .product-card-title {
    color: #005AAA;
}

.product-card-subtitle {
    font-size: 0.875rem;
    color: #777;
    margin: 0 0 1.25rem 0;
}

.product-card-desc {
    font-size: 0.875rem;
    color: #777;
    line-height: 1.7;
    margin: 0 0 1.25rem 0;
    flex-grow: 0;
}

.product-card-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 7.5rem;
    height: 2.5rem;
    background: #fff;
    color: #005AAA !important;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 62.4375rem;
    border: 0.0625rem solid #005AAA;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 0.625rem;
    align-self: flex-start;
}

.product-card:hover .product-card-btn,
.product-card-btn:hover {
    background: #005AAA;
    color: #fff !important;
    border-color: #005AAA;
}

.product-card-image {
    width: 100%;
    height: 18.75rem;
    background: #eee;
    margin: 0.9375rem 0;
    border-radius: 0;
    overflow: hidden;
}

.product-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

/* =========================
   数字分页样式
========================= */
.product-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 3rem;
}

.page-btn {
    width: 2.5rem;
    height: 2.5rem;
    background: transparent;
    color: #666;
    border: 0.0625rem solid #ddd;
    border-radius: 0.25rem;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-btn:hover {
    border-color: #005AAA;
    color: #005AAA;
}

.page-btn.active {
    background: #005AAA;
    color: #fff;
    border-color: #005AAA;
}

.page-btn.page-arrow {
    position: relative;
}

.page-btn.page-arrow::before {
    content: '';
    position: absolute;
    width: 0.4375rem;
    height: 0.4375rem;
    border-left: 0.0625rem solid #666;
    border-bottom: 0.0625rem solid #666;
    transform: rotate(45deg);
}

#prev-page::before {
    transform: rotate(45deg);
}

#next-page::before {
    transform: rotate(-135deg);
}

.page-btn.page-arrow:hover::before {
    border-color: #005AAA;
}

/* =========================
   产品中心下拉菜单响应式样式
========================= */
@media (max-width: 75rem) {
    .nav .menu .menu-item.product-menu .product-submenu-inner {
        padding: 1.5rem 3rem;
        gap: 2rem;
    }
    
    .nav .menu .menu-item.product-menu .product-submenu-col.product-col-left {
        width: 16rem;
        min-width: 14rem;
        max-width: 16rem;
    }
    
    .nav .menu .menu-item.product-menu .product-col-left {
        min-width: 12rem;
        max-width: 14rem;
    }
    
    .nav .menu .menu-item.product-menu .content-panel {
        gap: 2rem;
        padding-right: 0;
    }
    
    .nav .menu .menu-item.product-menu .content-col {
        min-width: 10rem;
        max-width: 12rem;
    }
    
    .nav .menu .menu-item.product-menu .product-recommend {
        min-width: 10rem;
        max-width: 10rem;
        padding: 0.5rem;
    }
}

@media (max-width: 60rem) {
    .nav .menu .menu-item.product-menu .product-submenu-inner {
        padding: 1rem 2rem;
        gap: 1.5rem;
    }
    
    .nav .menu .menu-item.product-menu .product-submenu-col.product-col-left {
        width: 12rem;
        min-width: 10rem;
        max-width: 12rem;
    }
    
    .nav .menu .menu-item.product-menu .product-col-left {
        min-width: 8rem;
        max-width: 10rem;
    }
    
    .nav .menu .menu-item.product-menu .content-col {
        min-width: 8rem;
        max-width: 10rem;
    }
    
    .nav .menu .menu-item.product-menu .content-panel {
        gap: 1.5rem;
    }
    
    .nav .menu .menu-item.product-menu .product-recommend {
        min-width: 8rem;
        max-width: 8rem;
        padding: 0.5rem;
    }
    
    .nav .menu .menu-item.product-menu .recommend-title {
        font-size: 0.875rem;
    }
    
    .nav .menu .menu-item.product-menu .recommend-model {
        font-size: 0.75rem;
    }
}

@media (max-width: 48rem) {
    .nav .menu .menu-item.product-menu .product-submenu-inner {
        padding: 1rem;
        gap: 1rem;
    }
    
    .nav .menu .menu-item.product-menu .product-submenu-col.product-col-left {
        width: 8rem;
        min-width: 8rem;
        max-width: 8rem;
        align-self: stretch;
    }
    
    .nav .menu .menu-item.product-menu .product-col-left {
        min-width: 6rem;
        max-width: 8rem;
    }
    
    .nav .menu .menu-item.product-menu .content-panel {
        gap: 1rem;
    }
    
    .nav .menu .menu-item.product-menu .product-recommend {
        min-width: 6rem;
        max-width: 6rem;
        padding: 0.25rem;
    }
    
    .nav .menu .menu-item.product-menu .recommend-title {
        font-size: 0.75rem;
    }
    
    .nav .menu .menu-item.product-menu .recommend-model {
        font-size: 0.625rem;
    }
}

/* =========================
   响应式样式
========================= */
@media (max-width: 75rem) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5625rem;
    }
    
    .tab-item {
        padding: 1.25rem 1.5625rem;
        font-size: 0.9375rem;
    }
    
    .product-card {
        min-height: 30rem;
    }
}

@media (max-width: 48rem) {
    .page-header h1 {
        font-size: 2rem;
    }
    
    .tab-item {
        padding: 1rem 0.9375rem;
        font-size: 0.875rem;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
    
    .product-section-title {
        font-size: 1.5rem;
    }
    
    .product-section-desc {
        font-size: 0.9375rem;
    }
    
    .product-card {
        min-height: auto;
        padding: 1.25rem;
    }
    
    .product-card-title {
        font-size: 1rem;
    }
    
    .product-card-desc {
        font-size: 0.8125rem;
    }
}