/* CSS Reset & Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #f97316;
    --secondary: #64748b;
    --accent: #ea580c;
    --bg: #fff7ed;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #fed7aa;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg);
    line-height: 1.6;
}

body:lang(zh) {
    font-family: 'Noto Sans SC', -apple-system, sans-serif;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 0;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.logo .subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Language Switcher */
.language-switcher {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.2s;
    color: var(--text-primary);
}

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

.lang-code {
    font-weight: 700;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    display: none;
    overflow: hidden;
    z-index: 200;
}

.lang-dropdown.show {
    display: block;
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: background 0.2s;
    font-size: 0.9rem;
}

.lang-option:hover {
    background: var(--bg);
    color: var(--primary);
}

.lang-option.active {
    background: var(--bg);
    color: var(--primary);
    font-weight: 700;
}

.lang-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 1.5rem;
    padding: 0 0.4rem;
    background: var(--primary);
    color: white;
    border-radius: 0.25rem;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.lang-option-disabled {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    opacity: 0.55;
    cursor: not-allowed;
    font-size: 0.9rem;
    user-select: none;
}

.lang-option-disabled:hover {
    background: none;
}

.lang-badge-muted {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 1.5rem;
    padding: 0 0.4rem;
    background: var(--border);
    color: var(--text-secondary);
    border-radius: 0.25rem;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.lang-soon {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 0.1rem 0.45rem;
    letter-spacing: 0.04em;
    margin-left: auto;
}

/* Product Switcher */
.product-switcher {
    position: relative;
    margin-right: 1rem;
}

.product-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.2s;
}

.product-btn:hover {
    background: var(--accent);
}

.product-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    min-width: 180px;
    display: none;
    z-index: 200;
}

.product-dropdown.show {
    display: block;
}

.product-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: background 0.2s;
}

.product-option:hover {
    background: var(--bg);
}

.product-option.active {
    background: var(--bg);
    color: var(--primary);
    font-weight: 600;
}

.product-icon {
    font-size: 1.25rem;
}

/* Product Navigation Bar */
.product-nav {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.product-nav-list {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.product-nav-item {
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.product-nav-item.active {
    background: var(--primary);
}

.product-nav-item.active .product-nav-link {
    color: white;
}

.product-nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.product-nav-link:hover {
    background: var(--bg);
    color: var(--primary);
}

.product-nav-icon {
    font-size: 1.25rem;
}

.product-nav-name {
    font-size: 0.9rem;
}

.product-nav-dropdown {
    position: relative;
}

.product-nav-dropdown .nav-arrow {
    font-size: 0.6rem;
    margin-left: 0.25rem;
}

/* Invisible bridge that fills the gap between the button and the menu.
   Without this the cursor leaves the hover zone while crossing the gap. */
.product-nav-dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 0.75rem; /* must be >= margin-top on .product-nav-menu */
}

.product-nav-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-top: 3px solid var(--primary);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    min-width: 240px;
    padding: 0.5rem;
    display: none;
    z-index: 100;
    margin-top: 0.75rem;
    max-height: calc(100vh - 160px);
    overflow-y: auto;
}

.product-nav-dropdown:hover .product-nav-menu {
    display: block;
}

.category-nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 0.75rem;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    transition: background 0.2s;
}

.category-nav-link:hover {
    background: var(--bg);
    color: var(--primary);
}

.category-nav-link i {
    color: var(--primary);
    width: 1.25rem;
}

.category-count {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg);
    padding: 0.125rem 0.5rem;
    border-radius: 1rem;
}

.no-categories {
    display: block;
    padding: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-align: center;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, #c2410c 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Product Cards on Homepage */
.product-cards {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.product-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem 2rem;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 1rem;
    color: white;
    text-decoration: none;
    transition: all 0.2s;
    min-width: 140px;
    backdrop-filter: blur(4px);
}

.product-card:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.7);
    transform: translateY(-3px);
}

.product-card.active {
    background: white;
    border-color: white;
    color: var(--primary);
}

.product-card-icon {
    font-size: 2rem;
    line-height: 1;
}

.product-card-name {
    font-size: 1rem;
    font-weight: 700;
}

.product-card-desc {
    font-size: 0.75rem;
    opacity: 0.8;
}

.product-card.active .product-card-desc {
    opacity: 0.6;
}

/* Empty product state */
.empty-product {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-product-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.empty-product h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

/* Search Form */
.search-form {
    max-width: 600px;
    margin: 0 auto;
}

.search-input-group {
    display: flex;
    gap: 0.5rem;
}

.search-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 2px solid transparent;
    border-radius: 0.5rem;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.search-input:focus {
    border-color: var(--primary);
}

.search-btn {
    padding: 1rem 2rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.search-btn:hover {
    background: #c2410c;
    transform: translateY(-1px);
}

/* Sections */
.section {
    padding: 3rem 0;
}

.section-title {
    font-size: 1.875rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    text-decoration: none;
    transition: all 0.3s;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.category-icon-large i,
.category-icon i {
    color: var(--primary);
}

.category-title {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.category-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.category-count {
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.article-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    text-decoration: none;
    display: block;
    transition: all 0.3s;
    position: relative;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.article-card.featured {
    border-color: var(--accent);
}

.article-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--accent);
    color: white;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.article-title {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.share-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.625rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    position: relative;
    transition: all 0.2s;
}

.share-link-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.share-link-btn .share-tooltip {
    display: none;
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: #fff;
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    white-space: nowrap;
    pointer-events: none;
}

.share-link-btn .share-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 4px solid transparent;
    border-top-color: var(--text-primary);
}

.share-link-btn.copied {
    border-color: #22c55e;
    color: #22c55e;
}

.share-link-btn.copied .share-tooltip {
    display: block;
}

.category-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg);
    color: var(--primary);
    border-radius: 0.25rem;
    font-weight: 600;
}

.category-badge-small {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--bg);
    color: var(--primary);
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Articles List */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.article-list-item {
    background: var(--card-bg);
    border-radius: 0.75rem;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    transition: all 0.2s;
    overflow: hidden;
}

.article-list-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.article-list-link {
    flex: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    min-width: 0;
}

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

.article-arrow {
    font-size: 1.5rem;
    color: var(--text-secondary);
    transition: transform 0.2s;
    margin-left: 1rem;
    flex-shrink: 0;
}

.article-list-item:hover .article-arrow {
    transform: translateX(4px);
    color: var(--primary);
}

.article-share-btn {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    margin-right: 0.75rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
    transition: all 0.2s;
    font-size: 0.8rem;
}

.article-share-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--bg);
}

.article-share-btn .share-tooltip {
    display: none;
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: #fff;
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    white-space: nowrap;
    pointer-events: none;
}

.article-share-btn .share-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 4px solid transparent;
    border-top-color: var(--text-primary);
}

.article-share-btn.copied {
    border-color: #22c55e;
    color: #22c55e;
}

.article-share-btn.copied .share-tooltip {
    display: block;
}

/* Article Detail */
.article-detail {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 1rem;
    margin: 2rem 0;
}

.article-header {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.article-body {
    margin: 2rem 0;
    font-size: 1.0625rem;
    line-height: 1.8;
}

.article-body h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.article-body h3 {
    font-size: 1.25rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-primary);
}

.article-body h4 {
    font-size: 1.125rem;
    margin: 1.25rem 0 0.5rem;
    color: var(--text-primary);
}

.article-body p {
    margin-bottom: 1rem;
}

.article-body ul,
.article-body ol {
    margin: 1rem 0 1rem 2rem;
}

.article-body li {
    margin-bottom: 0.5rem;
}

.article-body strong {
    font-weight: 600;
    color: var(--text-primary);
}

.article-body code {
    background: var(--bg);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

/* YouTube / Video embeds */
.video-embed {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
    border-radius: 0.75rem;
    margin: 1.5rem 0;
    background: #000;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: 0.75rem;
}

/* Breadcrumb */
.breadcrumb {
    padding: 1.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

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

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb .separator {
    color: var(--text-secondary);
}

.breadcrumb .current {
    color: var(--text-secondary);
}

/* Category Header */
.category-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin: 2rem 0;
}

.category-icon-large {
    font-size: 4rem;
}

.page-title {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
}

/* Article Footer */
.article-footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.helpful-section {
    text-align: center;
    padding: 2rem 0;
}

.helpful-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1rem;
}

.btn-helpful {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border);
    background: var(--card-bg);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-helpful:hover {
    border-color: var(--primary);
    background: var(--bg);
}

/* Related Articles */
.related-articles {
    margin: 3rem 0;
}

.related-articles h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.related-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.related-item {
    background: var(--bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    text-decoration: none;
    display: block;
    transition: all 0.2s;
}

.related-item:hover {
    background: var(--border);
}

.related-item h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.related-item p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Need Help */
.need-help {
    text-align: center;
    padding: 2rem;
    background: var(--bg);
    border-radius: 0.75rem;
}

.need-help h3 {
    margin-bottom: 1rem;
}

.btn-primary {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-primary:hover {
    background: #ea580c;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.empty-state h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    margin-bottom: 0.5rem;
}

.footer-section h4 {
    margin-bottom: 0.75rem;
}

.footer-section p {
    opacity: 0.8;
    font-size: 0.875rem;
}

.contact-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

.contact-link:hover {
    text-decoration: underline;
}

/* Section Groups (category page) */
.section-group {
    margin-bottom: 2.5rem;
}

.section-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    width: 100%;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border);
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
    cursor: pointer;
    text-align: left;
}

.section-heading-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-heading h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin: 0;
}

.section-heading i {
    color: var(--primary);
    font-size: 1.1rem;
}

.section-toggle-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 50%;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--primary);
    font-size: 0.75rem;
    flex-shrink: 0;
    transition: background 0.2s, border-color 0.2s;
}

.section-heading:hover .section-toggle-icon {
    background: var(--border);
    border-color: var(--primary);
}

.section-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

/* Images always fit their container */
.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    display: block;
}

/* Responsive */
@media (max-width: 768px) {

    /* ── Container ── */
    .container {
        padding: 0 1rem;
    }

    /* ── Header ── */
    .header {
        padding: 1rem 0;
    }

    .logo h1 {
        font-size: 1.2rem;
    }

    .logo .subtitle {
        font-size: 0.75rem;
    }

    /* ── Product Nav ── */
    .product-nav {
        padding: 0;
    }

    /* Remove container padding inside product-nav so the list is full-width */
    .product-nav .container {
        padding: 0;
        max-width: 100%;
    }

    .product-nav-list {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 0;
        justify-content: flex-start;
        padding: 0 0.5rem; /* restore edge breathing room */
        /* hide scrollbar but keep scroll */
        scrollbar-width: none;
    }

    .product-nav-list::-webkit-scrollbar {
        display: none;
    }

    .product-nav-item {
        flex-shrink: 0;
    }

    .product-nav-link {
        padding: 0.65rem 1rem;
        white-space: nowrap;
        font-size: 0.82rem;
        gap: 0.35rem;
    }

    .product-nav-icon {
        font-size: 1rem;
    }

    /* Dropdown menus on mobile: full-width below nav */
    .product-nav-menu {
        position: fixed;
        top: auto;
        left: 0;
        right: 0;
        transform: none;
        width: 100%;
        border-radius: 0;
        margin-top: 0;
        z-index: 200;
    }

    /* ── Breadcrumb ── */
    .breadcrumb {
        flex-wrap: wrap;
        gap: 0.3rem 0.4rem;
        padding: 1rem 0;
        font-size: 0.8rem;
        line-height: 1.5;
    }

    /* ── Hero ── */
    .hero {
        padding: 2.5rem 0;
    }

    .hero h2 {
        font-size: 1.6rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

    /* ── Search ── */
    .search-input-group {
        flex-direction: column;
    }

    .search-input,
    .search-btn {
        width: 100%;
        padding: 0.75rem 1rem;
    }

    /* ── Product cards on homepage ── */
    .product-cards {
        gap: 0.75rem;
    }

    .product-card {
        padding: 1rem 1.25rem;
        min-width: 110px;
    }

    /* ── Categories / Articles grids ── */
    .categories-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    /* ── Article detail ── */
    .article-detail {
        padding: 1.25rem;
        margin: 1rem 0;
        border-radius: 0.75rem;
    }

    .article-body {
        font-size: 1rem;
        line-height: 1.75;
    }

    .article-body h2 { font-size: 1.25rem; }
    .article-body h3 { font-size: 1.1rem; }
    .article-body h4 { font-size: 1rem; }

    /* Prevent tables inside article content from overflowing */
    .article-body table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        max-width: 100%;
    }

    /* ── Category page ── */
    .category-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
        margin: 1rem 0;
    }

    .category-icon-large {
        font-size: 2.5rem;
    }

    .page-title {
        font-size: 1.5rem;
    }

    /* ── Related articles ── */
    .related-list {
        grid-template-columns: 1fr;
    }

    /* ── Footer ── */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}