/* ============================================================
   常誉生物 - 核心样式表
   设计方向: 科研 · 可信 · 留白充足
   主色: #173B72 (深蓝), #2E6FB7 (科研蓝), #6F9E5B (低饱和绿)
   ============================================================ */

/* === CSS 变量 === */
:root {
    --color-primary: #173B72;
    --color-primary-light: #2E6FB7;
    --color-accent: #6F9E5B;
    --color-accent-light: #8DB87A;
    --color-bg: #FFFFFF;
    --color-bg-light: #F5F7FA;
    --color-bg-alt: #EDF1F6;
    --color-text: #2D3748;
    --color-text-light: #5A6B7F;
    --color-text-muted: #8899AA;
    --color-border: #DDE3EB;
    --color-border-light: #EEF1F5;
    --color-white: #FFFFFF;
    --color-cta-bg: #173B72;
    --color-cta-hover: #2E6FB7;
    --color-card-shadow: rgba(23, 59, 114, 0.06);
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, "Fira Code", "Roboto Mono", Menlo, Consolas, monospace;
    --max-width: 1200px;
    --max-width-narrow: 800px;
    --radius: 6px;
    --radius-sm: 4px;
    --radius-lg: 10px;
    --transition: 0.2s ease;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;
}

/* === 全局重置 === */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.75;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    margin: 0;
    padding: 0;
}

/* === 排版 === */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-primary);
    font-weight: 600;
    line-height: 1.35;
    margin: 1.5em 0 0.5em;
}

h1 { font-size: 2rem; letter-spacing: -0.01em; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p { margin: 0 0 1rem; }

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

/* === 产品列表全宽容器 === */
.container-product {
    width: 100%;
    max-width: 96%;
    margin: 0 auto;
    padding: 0 0.5rem;
}

@media (min-width: 1600px) {
    .container-product {
        max-width: 1500px;
    }
}

/* === 通用布局容器 === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.container-narrow {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* === 站点头部 & 导航 === */
.site-header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border-light);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    flex-wrap: wrap;
}

.site-branding {
    display: flex;
    align-items: center;
    white-space: nowrap;
}

.site-branding .logo-link {
    display: inline-block;
    text-decoration: none;
}

.site-branding .site-logo {
    width: 160px;
    height: auto;
    display: block;
}

.site-branding .tagline {
    display: block;
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-text-muted);
    margin-top: 2px;
}

@media (max-width: 480px) {
    .site-branding .site-logo {
        width: 120px;
    }
}

/* 主导航 */
.primary-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0;
}

.primary-nav > li {
    position: relative;
}

.primary-nav > li > a {
    display: block;
    padding: 0.5rem 0.85rem;
    font-size: 0.95rem;
    color: var(--color-text);
    font-weight: 500;
    text-decoration: none;
    white-space: nowrap;
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition);
}

.primary-nav > li > a:hover {
    color: var(--color-primary-light);
    background: var(--color-bg-alt);
    text-decoration: none;
}

.primary-nav > li.current-menu-item > a,
.primary-nav > li.current-page-ancestor > a {
    color: var(--color-primary-light);
}

/* 二级菜单 */
.primary-nav > li {
    padding-bottom: 8px; /* 桥接父项与子菜单的间隙 */
}

.primary-nav .sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    list-style: none;
    margin: 0;
    padding: 0.5rem 0;
    z-index: 200;
}

.primary-nav .sub-menu::before {
    content: "";
    position: absolute;
    top: -10px;
    left: 0;
    right: 0;
    height: 10px;
    /* 透明桥接层，防止鼠标移动时菜单消失 */
}

.primary-nav > li:hover > .sub-menu,
.primary-nav > li:focus-within > .sub-menu,
.primary-nav .sub-menu:hover {
    display: block;
}

.primary-nav .sub-menu li a {
    display: block;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    color: var(--color-text);
    text-decoration: none;
    white-space: nowrap;
}

.primary-nav .sub-menu li a:hover {
    background: var(--color-bg-light);
    color: var(--color-primary-light);
    text-decoration: none;
}

/* 移动端汉堡菜单 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text);
    cursor: pointer;
    padding: 0.25rem;
}

@media (max-width: 860px) {
    .menu-toggle {
        display: block;
    }

    .primary-nav {
        display: none;
        flex-direction: column;
        width: 100%;
        padding: var(--spacing-sm) 0;
        gap: 2px;
    }

    .primary-nav.toggled {
        display: flex;
    }

    .primary-nav .sub-menu {
        position: static;
        display: none;
        box-shadow: none;
        border: none;
        padding-left: 1rem;
    }

    .primary-nav > li:hover > .sub-menu,
    .primary-nav .sub-menu.toggled {
        display: block;
    }
}

/* === 页面头部横幅 === */
.page-hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1a4d8f 100%);
    color: var(--color-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.page-hero h1 {
    color: var(--color-white);
    font-size: 2.25rem;
    margin: 0 0 var(--spacing-sm);
}

.page-hero .hero-subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 首页 Hero 更突出 */
.home-hero {
    padding: var(--spacing-2xl) 0;
}

.home-hero h1 {
    font-size: 2.5rem;
}

@media (max-width: 600px) {
    .page-hero h1 { font-size: 1.75rem; }
    .home-hero h1 { font-size: 1.9rem; }
    .home-hero { padding: var(--spacing-xl) 0; }
}

/* === 按钮 / CTA === */
.btn {
    display: inline-block;
    padding: 0.65rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition);
    text-align: center;
    line-height: 1.4;
    font-family: var(--font-sans);
}

.btn-primary {
    background: var(--color-cta-bg);
    color: var(--color-white);
    border-color: var(--color-cta-bg);
}

.btn-primary:hover {
    background: var(--color-cta-hover);
    border-color: var(--color-cta-hover);
    color: var(--color-white);
    text-decoration: none;
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    text-decoration: none;
}

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

.btn-white:hover {
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
    text-decoration: none;
}

.btn-lg {
    padding: 0.85rem 2rem;
    font-size: 1.05rem;
}

/* === 产品卡片 === */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.card-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.card-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 768px) {
    .card-grid-3,
    .card-grid-2 {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
    box-shadow: 0 6px 20px var(--color-card-shadow);
    transform: translateY(-2px);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.card-icon.blue { background: #E8F0FA; color: var(--color-primary-light); }
.card-icon.green { background: #EDF5E7; color: var(--color-accent); }
.card-icon.amber { background: #FFF8E7; color: #B8860B; }
.card-icon.purple { background: #F3E8FA; color: #7B4FBF; }

.card h3 {
    margin-top: 0;
    font-size: 1.15rem;
}

.card h3 a {
    color: var(--color-primary);
    text-decoration: none;
}

.card p {
    color: var(--color-text-light);
    font-size: 0.93rem;
    margin-bottom: var(--spacing-sm);
}

.card .card-link {
    font-weight: 500;
    font-size: 0.9rem;
}

/* === 研究领域卡片 === */
.field-card {
    border-left: 4px solid var(--color-primary-light);
}

/* === 分区标题 === */
.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title h2 {
    position: relative;
    display: inline-block;
    padding-bottom: 0.75rem;
}

.section-title h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--color-accent);
    border-radius: 2px;
}

.section-title p {
    color: var(--color-text-light);
    max-width: 600px;
    margin: var(--spacing-xs) auto 0;
}

/* === 内容区 === */
.content-section {
    padding: var(--spacing-xl) 0;
}

.content-section.alt {
    background: var(--color-bg-light);
}

.page-content {
    padding: var(--spacing-lg) 0 var(--spacing-xl);
}

/* === 面包屑 === */
.breadcrumbs {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding: var(--spacing-xs) 0;
    margin-bottom: var(--spacing-sm);
}

.breadcrumbs a {
    color: var(--color-text-light);
    text-decoration: none;
}

.breadcrumbs .sep {
    margin: 0 0.5rem;
}

/* === FAQ === */
.faq-list {
    max-width: var(--max-width-narrow);
    margin: var(--spacing-lg) auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--spacing-sm) 0;
}

.faq-item h3 {
    font-size: 1.05rem;
    cursor: pointer;
    margin: 0;
    padding: 0.5rem 0;
    color: var(--color-text);
    transition: color var(--transition);
}

.faq-item h3:hover {
    color: var(--color-primary-light);
}

.faq-item .faq-answer {
    color: var(--color-text-light);
    font-size: 0.95rem;
    padding-bottom: 0.5rem;
}

/* === CTA 区块 === */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1a4d8f 100%);
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xl);
}

.cta-section h2 {
    color: var(--color-white);
    margin-top: 0;
}

.cta-section p {
    max-width: 600px;
    margin: 0 auto var(--spacing-md);
    opacity: 0.9;
}

/* === 页脚 === */
.site-footer {
    background: #0F2440;
    color: rgba(255,255,255,0.75);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    font-size: 0.9rem;
}

.site-footer .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

@media (max-width: 768px) {
    .site-footer .footer-grid {
        grid-template-columns: 1fr;
    }
}

.site-footer h4 {
    color: var(--color-white);
    margin-top: 0;
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.site-footer a {
    color: rgba(255,255,255,0.75);
    text-decoration: none;
}

.site-footer a:hover {
    color: var(--color-white);
    text-decoration: underline;
}

.site-footer ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.site-footer ul li {
    margin-bottom: 0.4rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    font-size: 0.83rem;
    color: rgba(255,255,255,0.5);
}

.footer-bottom .footer-links {
    margin-bottom: 0.5rem;
}

.footer-bottom .footer-links a {
    margin: 0 0.75rem;
}

/* === 免责/科研用途提示 === */
.disclaimer {
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: var(--spacing-md) 0;
}

.disclaimer::before {
    content: "ⓘ ";
}

/* === 文章列表 === */
.post-list {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.post-item {
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--spacing-md) 0;
}

.post-item h2 {
    margin-top: 0;
    font-size: 1.25rem;
}

.post-item .post-meta {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.post-item .post-excerpt {
    color: var(--color-text-light);
}

/* === 产品详情页 === */
.product-overview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

@media (max-width: 768px) {
    .product-overview {
        grid-template-columns: 1fr;
    }
}

.product-highlights {
    list-style: none;
    padding: 0;
}

.product-highlights li {
    padding: 0.4rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.product-highlights li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* === 内部链接提示 === */
.related-links {
    background: var(--color-bg-light);
    border-radius: var(--radius);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.related-links h3 {
    margin-top: 0;
    font-size: 1rem;
}

/* === 响应式微调 === */
@media (max-width: 600px) {
    body { font-size: 15px; }
    h1 { font-size: 1.6rem; }
    .container { padding: 0 1rem; }
    .card-grid { grid-template-columns: 1fr; }
    .btn-lg { padding: 0.7rem 1.5rem; font-size: 1rem; }
}

/* === 搜索栏 === */
.search-form {
    margin: 0 auto;
}

.search-box {
    display: flex;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(23,59,114,0.08);
}

.search-input {
    flex: 1;
    border: none;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    font-family: var(--font-sans);
    outline: none;
    min-width: 0;
}

.search-submit {
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 0.75rem 1.25rem;
    font-size: 0.95rem;
    cursor: pointer;
    font-family: var(--font-sans);
    white-space: nowrap;
    transition: background var(--transition);
}

.search-submit:hover {
    background: var(--color-primary-light);
}

/* ============================================================
   产品列表增强样式
   ============================================================ */

/* 产品搜索栏 */
.product-search-bar {
    position: relative;
    margin-bottom: 1rem;
}

.product-search-bar input {
    width: 100%;
    padding: 0.85rem 1rem 0.85rem 2.75rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: border-color var(--transition), box-shadow var(--transition);
    background: var(--color-white);
}

.product-search-bar input:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(46, 111, 183, 0.1);
}

.product-search-bar .search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.1rem;
    pointer-events: none;
}

/* 产品计数条 */
.product-count-bar {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border-light);
}

/* 产品列表容器 */
.product-list {
    margin-bottom: 2rem;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-white);
}

/* 单个产品行 */
.product-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1.1rem 1.5rem;
    border-bottom: 1px solid var(--color-border-light);
    transition: background var(--transition);
    background: var(--color-white);
}

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

.product-item:hover {
    background: #f8fafc;
}

.product-item-main {
    flex: 1;
    min-width: 280px;
}

.product-item-title {
    font-weight: 600;
    font-size: 1.05rem;
    text-decoration: none;
    color: var(--color-primary);
    line-height: 1.5;
}

.product-item-title:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

.product-meta-text {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* 产品徽标 */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
    vertical-align: middle;
}

.badge-hot {
    background: #e74c3c;
    color: #fff;
}

.badge-cite {
    background: #27ae60;
    color: #fff;
}

.badge-type {
    background: #E8F0FA;
    color: var(--color-primary-light);
    border: 1px solid #C8D8ED;
}

.badge-outline {
    background: #f0f0f0;
    color: var(--color-text);
    border: 1px solid #ddd;
    padding: 4px 10px;
    font-size: 0.8rem;
}

/* 筛选标签组 */
.filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin: 1.5rem 0;
}

.filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.55rem 1.1rem;
    border: 2px solid var(--color-border);
    border-radius: 24px;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    color: var(--color-text);
    background: var(--color-white);
    transition: all var(--transition);
    cursor: pointer;
}

.filter-chip:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary-light);
    text-decoration: none;
    background: #f0f6fc;
}

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

.filter-chip .chip-count {
    font-size: 0.78rem;
    opacity: 0.75;
    font-weight: 400;
}

.filter-chip.active .chip-count {
    opacity: 0.9;
}

/* 分类卡片中的产品计数徽标 */
.chip-count-badge {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--color-primary-light);
    background: #E8F0FA;
    padding: 1px 8px;
    border-radius: 10px;
    font-weight: 500;
    margin-left: 4px;
    vertical-align: middle;
}

/* 当前筛选信息 */
.active-filter-info {
    text-align: center;
    padding: 0.75rem;
    background: #f0f6fc;
    border-radius: var(--radius);
    margin: 1rem 0;
    font-size: 0.9rem;
    color: var(--color-text);
}

.clear-filter {
    color: #e74c3c;
    text-decoration: none;
    font-weight: 500;
    margin-left: 0.25rem;
}

.clear-filter:hover {
    text-decoration: underline;
}

/* 分页导航 */
.pagination {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin: 2.5rem 0 1.5rem;
    padding: 0;
    width: 100%;
}

.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.75rem;
    height: 2.75rem;
    padding: 0 1rem;
    background: #f5f7fa;
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--color-text);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition);
    border: 1px solid transparent;
}

.page-link:hover {
    background: var(--color-primary-light);
    color: #fff;
    text-decoration: none;
    border-color: var(--color-primary-light);
}

.page-link.current {
    background: var(--color-primary);
    color: #fff;
    pointer-events: none;
    border-color: var(--color-primary);
    font-weight: 600;
}

.page-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.75rem;
    height: 2.75rem;
    color: var(--color-text-muted);
    font-size: 1rem;
    letter-spacing: 2px;
}

/* 选型方式卡片 */
.selection-method-card {
    text-align: center;
    padding: 2rem 1.5rem 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.selection-method-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(23, 59, 114, 0.12);
}

.selection-method-card .card-icon {
    margin-left: auto;
    margin-right: auto;
}

.selection-method-card h3 {
    margin-top: 0.5rem;
}

.selection-method-card p {
    flex: 1;
}

.selection-method-card .btn {
    margin-top: auto;
    width: 100%;
}

/* 子分类卡片 */
.sub-cat-card {
    padding: 1.25rem;
    transition: all var(--transition);
}

.sub-cat-card:hover {
    border-color: var(--color-primary-light);
}

/* ============================================================
   子分类浏览卡片（产品分类页用）
   ============================================================ */
.subcat-browse-grid {
    margin: 2rem 0;
}

.subcat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1.5rem 1rem;
    background: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all 0.25s ease;
    min-height: 140px;
    cursor: pointer;
}

.subcat-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: 0 6px 24px rgba(23, 59, 114, 0.1);
    transform: translateY(-3px);
    text-decoration: none;
}

.subcat-icon {
    font-size: 2.2rem;
    margin-bottom: 0.6rem;
    line-height: 1;
}

.subcat-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.35rem;
    line-height: 1.3;
}

.subcat-count {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    background: var(--color-bg-light);
    padding: 2px 10px;
    border-radius: 12px;
}

@media (max-width: 600px) {
    .subcat-card {
        min-height: 100px;
        padding: 1.25rem 0.75rem;
    }
    .subcat-icon {
        font-size: 1.8rem;
    }
    .subcat-name {
        font-size: 0.85rem;
    }
}

/* 小按钮 */
.btn-sm {
    padding: 0.4rem 1rem;
    font-size: 0.9rem;
    white-space: nowrap;
}

/* 响应式：产品行在小屏幕上竖向排列 */
@media (max-width: 600px) {
    .product-item {
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem;
    }

    .product-item .btn-sm {
        align-self: flex-start;
    }

    .filter-chips {
        gap: 0.35rem;
    }

    .filter-chip {
        padding: 0.4rem 0.8rem;
        font-size: 0.82rem;
    }

    .page-link {
        min-width: 2rem;
        height: 2.25rem;
        padding: 0 0.5rem;
        font-size: 0.82rem;
    }
}

/* === 打印样式 === */
@media print {
    .site-header, .site-footer, .cta-section, .btn { display: none; }
}

/* ============================================================
   研究领域产品卡片（research pages）
   ============================================================ */
.research-product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 1.25rem;
    margin: 1.5rem 0 2rem;
}

.rp-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.rp-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: 0 4px 16px rgba(23, 59, 114, 0.08);
}

.rp-card-header {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.rp-type-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 0.78rem;
    font-weight: 600;
    white-space: nowrap;
}

.rp-sku {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    margin-left: auto;
}

.rp-card-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 0 0 0.75rem 0;
    line-height: 1.4;
}

.rp-card-title a {
    color: var(--color-primary);
    text-decoration: none;
}

.rp-card-title a:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

.rp-card-info {
    flex: 1;
    margin-bottom: 1rem;
}

.rp-card-info p {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin: 0 0 0.35rem 0;
    line-height: 1.5;
}

.rp-label {
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.8rem;
    background: var(--color-bg-light);
    padding: 1px 6px;
    border-radius: 3px;
    margin-right: 2px;
}

.rp-card-footer {
    margin-top: auto;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-border-light);
}

@media (max-width: 768px) {
    .research-product-grid {
        grid-template-columns: 1fr;
    }
    .rp-card {
        padding: 1rem 1.1rem;
    }
}