.products-hero {
            padding: 100px 0 60px;
            text-align: center;
            background: linear-gradient(to bottom, var(--background), var(--primary-light));
        }
        
        .products-hero h1 {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 300;
            margin-bottom: 1rem;
            color: var(--primary-dark);
        }
        
        .products-hero p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto;
            color: var(--text-medium);
        }
        
        .nav {
            padding: 20px 0;
            background-color: var(--background-alt);
            font-size: 0.9rem;
        }
        
        .nav a {
            color: var(--text-medium);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        
        .nav a:hover {
            color: var(--primary);
        }
        
        .nav i {
            margin: 0 8px;
            color: var(--text-light);
        }
        
        .products-section {
            padding: 60px 0;
            background-color: var(--background);
        }
        
        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 30px;
        }
        
        .product-card {
            background: var(--background);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
        }
        
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        
        .product-image {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        
        .product-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .product-card:hover .product-image img {
            transform: scale(1.05);
        }
        
        .product-info {
            padding: 20px;
            text-align: center;
        }
        
        .product-info a {
            color: var(--text-dark);
            text-decoration: none;
            font-weight: 500;
            font-size: 1.1rem;
            transition: color 0.3s ease;
        }
        
        .product-info a:hover {
            color: var(--primary);
        }
        
        .product-series {
            margin-top: 5px;
            font-size: 0.9rem;
            color: var(--text-medium);
        }
        
        .filter-section {
            padding: 30px 0;
            background-color: var(--background-alt);
        }
        
        .filter-container {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            justify-content: center;
            align-items: center;
        }
        
        .filter-group {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .filter-label {
            font-weight: 500;
            color: var(--text-dark);
        }
        
        .filter-select {
            padding: 8px 15px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            background: var(--background);
            color: var(--text-dark);
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .filter-select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(190, 0, 47, 0.1);
        }
        
        .series-section {
            margin-bottom: 50px;
        }
        
        .series-header {
            text-align: center;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--border);
        }
        
        .series-header h2 {
            font-size: 1.8rem;
            font-weight: 400;
            color: var(--primary-dark);
            margin-bottom: 10px;
        }
        
        .series-description {
            color: var(--text-medium);
            max-width: 800px;
            margin: 0 auto;
        }
        
        .pagination {
            display: flex;
            justify-content: center;
            margin-top: 50px;
            gap: 10px;
        }
        
        .pagination a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius);
            background: var(--background);
            color: var(--text-dark);
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid var(--border);
        }
        
        .pagination a:hover, 
        .pagination a.active {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }
        
        @media (max-width: 768px) {
            .products-grid {
                grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
                gap: 20px;
            }
            
            .filter-container {
                flex-direction: column;
                align-items: flex-start;
            }
        }

/* 系列概览 */
.series-overview {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 50px;
}

.overview-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.overview-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.overview-card h4 {
    color: var(--primary-dark);
    margin: 0 0 15px 0;
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: 1px;
}

.overview-card p {
    color: var(--text-medium);
    margin: 12px 0;
    font-size: 0.95rem;
    line-height: 1.6;
    flex-grow: 1;
}
.view-btn {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    padding: 10px 0;
    font-size: 0.95rem;
    cursor: pointer;
    margin-top: 16px;
    width: 100%;
    transition: all 0.3s ease;
    font-weight: 500;
    font-family: inherit;
}

.view-btn:hover {
    background: var(--primary);
    color: white;
}

/* 响应式设计 */
@media (max-width: 768px) {
  
    .series-overview {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-bottom: 40px;
    }
    
}

@media (max-width: 480px) {
     .overview-card {
        padding: 20px;
    }
    
    .overview-card h4 {
        font-size: 1.2rem;
    }
}
/* 折叠式导航样式 */
.collapsible-navigation {
    background: var(--background-alt);
    border-radius: var(--radius);
    margin-bottom: 40px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.collapsible-section {
    border-bottom: 1px solid var(--border);
}

.collapsible-section:last-child {
    border-bottom: none;
}

.collapsible-header {
    width: 100%;
    background: var(--background);
    border: none;
    padding: 20px 24px;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    font-family: inherit;
}

.collapsible-header:hover {
    background: var(--background-alt);
    color: var(--primary);
}

.collapsible-header.active {
    background: var(--primary-light);
    color: var(--primary);
}

.collapsible-icon {
    transition: transform 0.3s ease;
    color: var(--text-light);
}

.collapsible-header.active .collapsible-icon {
    transform: rotate(180deg);
    color: var(--primary);
}

.collapsible-content {
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--background);
}

.collapsible-section.active .collapsible-content {
    padding: 25px 24px;
    max-height: none; /* 改为无限制 */
    overflow-y: visible; /* 改为可见 */
}

/* 增加内容区域的最小高度 */
.collapsible-content .filter-buttons,
.collapsible-content .quick-filters {
    min-height: 120px; /* 确保有足够的高度 */
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: flex-start;
}

.filter-btn {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 12px 20px;
    font-size: 1rem;
    color: var(--text-medium);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(190, 0, 47, 0.15);
}

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

/* 移动版返回按钮 */
.mobile-back-btn {
    display: none;
    padding: 15px 20px;
    background: var(--background);
    border-bottom: 1px solid var(--border);
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    color: var(--primary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--radius);
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: var(--background-alt);
}

.back-btn svg {
    width: 16px;
    height: 16px;
}

/* 快速筛选样式 */
.quick-filters {
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 150px;
}

.quick-jump {
    display: flex;
    gap: 15px;
    align-items: center;
}

.series-selector {
    flex: 1;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    background: var(--background);
    color: var(--text-dark);
    transition: all 0.3s ease;
    font-family: inherit;
    min-height: 50px;
}

.series-selector:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(190, 0, 47, 0.1);
}

.jump-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
    transition: background 0.3s ease;
    min-width: 90px;
    font-family: inherit;
    font-size: 1rem;
    min-height: 50px;
}

.jump-btn:hover {
    background: var(--primary-dark);
}

.filter-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.quick-filter-btn {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 10px 18px;
    font-size: 1rem;
    color: var(--text-medium);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.quick-filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* 移动版全屏模式 */
@media (max-width: 768px) {
    .collapsible-navigation.mobile-expanded {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 1000;
        margin: 0;
        border-radius: 0;
        overflow-y: auto;
        background: var(--background);
    }
    
    .mobile-back-btn {
        display: block;
        position: sticky;
        top: 0;
        z-index: 1001;
        background: var(--background);
    }
    
    .collapsible-header {
        padding: 18px 20px;
        font-size: 1.05rem;
    }
    
    .collapsible-section.active .collapsible-content {
        max-height: none;
        overflow-y: visible;
    }
    
    .filter-buttons {
        justify-content: center;
        min-height: 150px;
    }
    
    .filter-btn {
        padding: 14px 16px;
        font-size: 0.95rem;
        flex: 1 0 calc(50% - 8px);
        text-align: center;
        min-height: 52px;
        font-size: 0.95rem;
    }
    
    .quick-jump {
        flex-direction: column;
        gap: 12px;
    }
    
    .series-selector, .jump-btn {
        width: 100%;
    }
    
    .filter-controls {
        justify-content: center;
        gap: 8px;
    }
    
    .quick-filter-btn {
        flex: 1 0 calc(50% - 8px);
        text-align: center;
        padding: 12px 8px;
        min-height: 48px;
        font-size: 0.95rem;
    }
    
    /* 移动端单独按钮样式 */
    .mobile-toggle-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        background: var(--primary);
        color: white;
        border: none;
        padding: 16px 24px;
        border-radius: var(--radius);
        font-size: 1.1rem;
        font-weight: 500;
        cursor: pointer;
        margin: 0 auto 30px;
        width: 100%;
        max-width: 300px;
        transition: all 0.3s ease;
    }
    
    .mobile-toggle-btn:hover {
        background: var(--primary-dark);
    }
    
    .mobile-toggle-btn svg {
        width: 20px;
        height: 20px;
    }
}

@media (max-width: 480px) {
    .collapsible-header {
        padding: 16px 18px;
        font-size: 1rem;
    }
    
    .collapsible-section.active .collapsible-content {
        padding: 18px;
        min-height: 200px;
    }
    
    .filter-btn {
        flex: 1 0 100%;
        padding: 16px;
        min-height: 56px;
        font-size: 1rem;
    }
    
    .quick-filter-btn {
        flex: 1 0 100%;
        padding: 14px;
        min-height: 52px;
        font-size: 1rem;
    }
    
    .series-selector, .jump-btn {
        min-height: 56px;
    }
    
    .back-btn {
        font-size: 1.1rem;
        padding: 10px 16px;
    }
}


.series-highlight {
    animation: highlight-pulse 2s ease-in-out;
    position: relative;
}

.series-highlight::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border: 2px solid var(--primary);
    border-radius: calc(var(--radius) + 2px);
    animation: highlight-border 2s ease-in-out;
    pointer-events: none;
}

@keyframes highlight-pulse {
    0% {
        background-color: rgba(190, 0, 47, 0.1);
    }
    50% {
        background-color: rgba(190, 0, 47, 0.2);
    }
    100% {
        background-color: transparent;
    }
}

@keyframes highlight-border {
    0% {
        opacity: 0.8;
        transform: scale(1.02);
    }
    70% {
        opacity: 0.4;
        transform: scale(1.01);
    }
    100% {
        opacity: 0;
        transform: scale(1);
    }
}

/* 古琴系列总览卡片样式 */
.series-overview {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.overview-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.overview-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.overview-image {
    height: 180px;
    overflow: hidden;
    position: relative;
}

.overview-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.overview-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.overview-title {
    color: var(--primary-dark);
    margin: 0 0 12px 0;
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: 1px;
    line-height: 1.3;
}

.overview-content p {
    color: var(--text-medium);
    margin: 8px 0;
    font-size: 0.95rem;
    line-height: 1.5;
}

.view-btn {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    padding: 10px 20px;
    font-size: 0.95rem;
    cursor: pointer;
    margin-top: 15px;
    transition: all 0.3s ease;
    font-weight: 500;
    font-family: inherit;
    align-self: flex-start;
}

.view-btn:hover {
    background: var(--primary);
    color: white;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .series-overview {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .series-overview {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 18px;
    }
    
    .overview-image {
        height: 160px;
    }
    
    .overview-content {
        padding: 16px;
    }
    
    .overview-title {
        font-size: 1.3rem;
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    .series-overview {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .overview-image {
        height: 150px;
    }
    
    .overview-title {
        font-size: 1.2rem;
    }
}

/* 480px以下超小屏幕的适配 */
@media (max-width: 480px) {
    /* 产品网格调整 */
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 15px;
    }
    
    /* 产品卡片调整 */
    .product-card {
        border-radius: 8px;
    }
    
    .product-image {
        height: 160px;
    }
    
    .product-info {
        padding: 15px;
    }
    
    .product-info a {
        font-size: 1rem;
    }
    
    /* 系列概览调整 */
    .series-overview {
        grid-template-columns: 1fr;
        gap: 15px;
        margin-bottom: 30px;
    }
    
    .overview-card {
        padding: 18px;
        border-radius: 10px;
    }
    
    .overview-image {
        height: 150px;
    }
    
    .overview-title {
        font-size: 1.2rem;
        margin-bottom: 10px;
    }
    
    .overview-content p {
        font-size: 0.9rem;
        line-height: 1.5;
        margin: 6px 0;
    }
    
    .view-btn {
        padding: 10px 16px;
        font-size: 0.9rem;
        margin-top: 12px;
    }
    
    /* 折叠导航调整 */
    .collapsible-header {
        padding: 16px 18px;
        font-size: 1rem;
    }
    
    .collapsible-section.active .collapsible-content {
        padding: 18px;
        min-height: 200px;
    }
    
    /* 筛选按钮调整 */
    .filter-buttons {
        gap: 8px;
    }
    
    .filter-btn {
        flex: 1 0 100%;
        padding: 16px;
        min-height: 56px;
        font-size: 1rem;
        border-radius: 12px;
    }
    
    /* 快速筛选调整 */
    .quick-filters {
        gap: 16px;
        min-height: 180px;
    }
    
    .quick-jump {
        gap: 12px;
    }
    
    .series-selector, .jump-btn {
        min-height: 56px;
        font-size: 1rem;
    }
    
    .series-selector {
        padding: 12px 16px;
    }
    
    .jump-btn {
        padding: 12px 24px;
        font-size: 1rem;
    }
    
    /* 快速筛选按钮调整 */
    .filter-controls {
        gap: 8px;
    }
    
    .quick-filter-btn {
        flex: 1 0 100%;
        padding: 14px;
        min-height: 52px;
        font-size: 1rem;
        border-radius: 12px;
    }
    
    /* 移动端返回按钮调整 */
    .mobile-back-btn {
        padding: 14px 18px;
    }
    
    .back-btn {
        font-size: 1.1rem;
        padding: 10px 16px;
    }
    
    /* 移动端切换按钮调整 */
    .mobile-toggle-btn {
        padding: 14px 20px;
        font-size: 1rem;
        margin-bottom: 20px;
    }
    
    /* 系列标题调整 */
    .series-header h2 {
        font-size: 1.5rem;
        margin-bottom: 8px;
    }
    
    .series-description {
        font-size: 0.95rem;
        line-height: 1.5;
    }
    
    /* 产品系列卡片调整 */
    .series-section .products-grid {
        gap: 12px;
    }
    
    .series-section .product-card {
        margin-bottom: 0;
    }
    
    /* 分页调整 */
    .pagination {
        margin-top: 30px;
        gap: 8px;
    }
    
    .pagination a {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }
    
    /* 英雄区域调整 */
    .products-hero {
        padding: 80px 0 40px;
    }
    
    .products-hero h1 {
        font-size: 1.8rem;
    }
    
    .products-hero p {
        font-size: 1rem;
        padding: 0 15px;
    }
    
    /* 导航面包屑调整 */
    .nav {
        padding: 15px 0;
        font-size: 0.85rem;
    }
    
    /* 高亮效果调整 */
    .series-highlight {
        animation: highlight-pulse 1.5s ease-in-out;
    }
    
    .series-highlight::before {
        top: -3px;
        left: -3px;
        right: -3px;
        bottom: -3px;
        border-width: 1px;
        border-radius: calc(var(--radius) + 1px);
    }
    
    /* 折叠图标大小调整 */
    .collapsible-icon {
        width: 10px;
        height: 10px;
    }
    
    /* 文字溢出处理 */
    .filter-btn, .quick-filter-btn {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        padding: 14px 10px;
    }
    
    /* 快速筛选选择器选项文字大小 */
    .series-selector option {
        font-size: 14px;
    }
    
    /* 确保小屏幕上的点击区域足够大 */
    button, 
    .filter-btn, 
    .quick-filter-btn, 
    .view-btn, 
    .jump-btn, 
    .back-btn {
        min-height: 44px; /* 苹果建议的最小点击区域 */
    }
    
    /* 输入框字体大小调整，防止iOS放大 */
    select.series-selector,
    input,
    textarea {
        font-size: 16px; /* 防止iOS自动缩放 */
    }
    
    /* 触摸滚动优化 */
    .collapsible-content {
        -webkit-overflow-scrolling: touch;
    }
    
    /* 小屏幕上的字体优化 */
    body {
        font-size: 14px;
    }
    
    h1, h2, h3, h4 {
        line-height: 1.3;
    }
    
    /* 边距优化 */
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    /* 系列卡片内部间距优化 */
    .overview-content {
        padding: 15px 12px;
    }
    
    /* 筛选容器优化 */
    .filter-container {
        gap: 12px;
    }
    
    .filter-group {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .filter-label {
        font-size: 0.9rem;
    }
    
    .filter-select {
        width: 100%;
        padding: 10px 12px;
        font-size: 0.9rem;
    }
    
    /* 产品系列间距优化 */
    .series-section {
        margin-bottom: 35px;
        scroll-margin-top: 15px; /* 为固定导航栏留出空间 */
    }
    
    /* 触摸友好设计 */
    a, button, [role="button"] {
        cursor: pointer;
        -webkit-tap-highlight-color: rgba(0, 0, 0, 0.1);
        touch-action: manipulation;
    }
    
    /* 防止文字选择 */
    .filter-btn, .quick-filter-btn, .view-btn {
        user-select: none;
        -webkit-user-select: none;
    }
}
@media (max-width: 480px) {
    .collapsible-section.active .collapsible-content {
        max-height: none !important;
        overflow-y: visible !important;
    }
    
    /* 确保在移动端展开时内容完全显示 */
    .collapsible-navigation.mobile-expanded .collapsible-section.active .collapsible-content {
        max-height: none;
        padding: 18px;
    }
}