* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Enable View Transitions for page navigation */
@view-transition {
    navigation: auto;
}

/* View transition names for persistent elements */
.site-header {
    view-transition-name: header;
}

.site-footer {
    view-transition-name: footer;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
    max-width: 960px;
}

.site-header {
    background-color: #fff;
    border-bottom: 1px solid #eee;
    padding: 20px;
}

.header-content {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
    text-decoration: none;
}

.site-title:hover {
    color: #666;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 25px;
}

.nav-link {
    color: #666;
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-link:hover {
    color: #333;
}

.contact-btn {
    background-color: #333;
    color: #fff;
    padding: 8px 20px;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.contact-btn:hover {
    background-color: #555;
}

.hero {
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
    max-width: 800px;
}

.hero h1 {
    font-size: 2rem;
    margin-bottom: 5px;
}

.hero p {
    color: #666;
}

.filter-nav {
    margin-bottom: 30px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    max-width: 800px;
}

.filter-btn {
    background: none;
    border: 1px solid #ddd;
    padding: 5px 15px;
    cursor: pointer;
    border-radius: 20px;
    font-size: 14px;
    transition: all 0.2s;
}

.filter-btn:hover {
    border-color: #333;
}

.filter-btn.active {
    background-color: #333;
    color: #fff;
    border-color: #333;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
    max-width: 800px;
    grid-auto-flow: dense;
}

.post-card {
    background-color: #f8f8f8;
    border-radius: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    min-height: 120px;
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.card-link {
    text-decoration: none;
    color: #333;
    display: flex;
    width: 100%;
    padding: 20px;
}

.card-content {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 100%;
    gap: 12px;
}

.card-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.card-emoji {
    font-size: 1.5rem;
}

.card-title {
    font-size: 1.1rem;
    line-height: 1.3;
    margin: 0;
}

.card-series {
    font-size: 0.85rem;
    color: #666;
    background-color: #fff;
    padding: 4px 10px;
    border-radius: 15px;
    align-self: flex-start;
    margin-top: auto;
}

.post-card.hidden {
    display: none;
}

.tags {
    display: flex;
    gap: 8px;
    margin-top: 15px;
}

.tag {
    background-color: #f0f0f0;
    padding: 3px 10px;
    border-radius: 15px;
    font-size: 0.85rem;
    color: #666;
    text-decoration: none;
    display: inline-block;
    transition: all 0.2s;
}

.tag:hover {
    background-color: #333;
    color: #fff;
    transform: translateY(-1px);
}

.single-post-container {
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

.single-post {
    flex: 1;
    max-width: 700px;
}

.post-header {
    background-color: #f8f8f8;
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 20px;
}

/* Series Navigation */
.series-info {
    background-color: #fff;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    margin-top: 20px;
    overflow: hidden;
}

.series-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 20px;
    cursor: pointer;
    user-select: none;
}

.series-icon {
    font-size: 1.2rem;
}

.series-name {
    font-weight: 600;
    flex: 1;
}

.series-position {
    font-size: 0.9rem;
    color: #666;
    background-color: #f0f0f0;
    padding: 4px 12px;
    border-radius: 20px;
}

.series-dropdown-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
    color: #666;
    font-size: 0.9rem;
    transition: transform 0.3s;
}

.series-dropdown-toggle:hover {
    color: #333;
}

.series-dropdown-toggle[aria-expanded="true"] .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-arrow {
    display: inline-block;
    transition: transform 0.3s;
}

.series-dropdown {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background-color: #fafafa;
    border-top: 1px solid #e0e0e0;
}

.series-dropdown.show {
    max-height: 400px;
}

.series-list {
    list-style: none;
    padding: 15px 0;
    margin: 0;
    counter-reset: series-counter;
}

.series-list li {
    margin: 0;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}

.series-list li.current {
    background-color: #f0f0f0;
    border-left-color: #333;
}

.series-list a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    text-decoration: none;
    color: #333;
    transition: background-color 0.2s;
}

.series-list li:not(.current) a:hover {
    background-color: #f5f5f5;
}

.part-number {
    font-size: 0.85rem;
    color: #666;
    font-weight: 500;
}

.part-title {
    flex: 1;
    font-size: 0.95rem;
}

.current-indicator {
    font-size: 0.9rem;
}

.post-title-with-emoji {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 2rem;
    margin: 0 0 15px 0;
    line-height: 1.2;
}

.post-emoji {
    font-size: 3rem;
    flex-shrink: 0;
}

.post-meta {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: #666;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.meta-icon {
    font-size: 0.9rem;
}

.meta-item time,
.meta-item span {
    color: #666;
}

/* Desktop TOC Sidebar */
.toc-sidebar {
    position: sticky;
    top: 20px;
    width: 250px;
    flex-shrink: 0;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

.toc-desktop {
    background-color: #f8f8f8;
    border-radius: 8px;
    padding: 25px;
}

.toc-desktop h2 {
    font-size: 1.1rem;
    margin: 0 0 15px 0;
    color: #333;
}

/* Mobile TOC Collapsible */
.toc-mobile {
    display: none;
    background-color: #f8f8f8;
    border-radius: 8px;
    margin-bottom: 30px;
}

.toc-toggle {
    width: 100%;
    padding: 15px 20px;
    background: none;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1rem;
    color: #333;
    font-weight: 600;
}

.toc-arrow {
    transition: transform 0.3s;
}

.toc-toggle[aria-expanded="true"] .toc-arrow {
    transform: rotate(180deg);
}

.toc-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 20px;
}

.toc-content.show {
    max-height: 500px;
    padding: 0 20px 20px;
}

/* Common TOC Styles */
.toc-desktop ul,
.toc-mobile ul {
    list-style: none;
    padding-left: 0;
}

.toc-desktop ul ul,
.toc-mobile ul ul {
    padding-left: 20px;
    margin-top: 5px;
}

.toc-desktop li,
.toc-mobile li {
    margin-bottom: 8px;
}

.toc-desktop a,
.toc-mobile a {
    color: #666;
    text-decoration: none;
    transition: color 0.2s;
    font-size: 0.95rem;
}

.toc-desktop a:hover,
.toc-mobile a:hover {
    color: #333;
}

.toc-desktop a.active,
.toc-mobile a.active {
    color: #333;
    font-weight: 700;
    position: relative;
}

.toc-desktop a.active::before,
.toc-mobile a.active::before {
    content: '';
    position: absolute;
    left: -15px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 70%;
    background-color: #333;
    border-radius: 2px;
}

.single-post .content {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 40px;
}

.single-post .content p {
    margin-bottom: 20px;
}

.single-post .content h2 {
    font-size: 1.6rem;
    margin: 40px 0 20px 0;
    color: #333;
}

.single-post .content h3 {
    font-size: 1.3rem;
    margin: 30px 0 15px 0;
    color: #444;
}

/* Lists in content area */
.single-post .content ul,
.single-post .content ol {
    margin: 20px 0;
    padding-left: 1.5em;
    list-style-position: inside;
}

.single-post .content ul {
    list-style-type: disc;
}

.single-post .content ol {
    list-style-type: decimal;
}

.single-post .content li {
    margin-bottom: 8px;
    line-height: 1.7;
}

.single-post .content li ul,
.single-post .content li ol {
    margin-top: 8px;
    margin-bottom: 8px;
}

/* Reading progress bar */
.progress-bar-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 4px;
    background-color: rgba(240, 240, 240, 0.9);
    overflow: hidden;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0;
    background-color: #333;
    transition: width 0.1s ease-out;
    border-radius: 2px;
}

/* Heading anchor links */
.heading-anchor {
    position: relative;
}

.anchor-link {
    position: absolute;
    left: -1.5em;
    color: #999;
    text-decoration: none;
    opacity: 0;
    font-weight: normal;
    font-size: 0.9em;
    transition: opacity 0.2s;
}

.heading-anchor:hover .anchor-link {
    opacity: 1;
}

.anchor-link:hover {
    color: #666;
}

@media (max-width: 600px) {
    .anchor-link {
        left: auto;
        right: 0;
        opacity: 0.5;
    }
}

/* Code blocks */
.code-block-wrapper {
    position: relative;
    margin: 20px 0;
}

.single-post .content pre {
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

.single-post .content pre code {
    background: none;
    padding: 0;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* Inline code */
.single-post .content code {
    background-color: #f0f0f0;
    color: #e83e8c;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* Copy button */
.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: #555;
    color: #fff;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background-color 0.2s;
    opacity: 0.7;
}

.copy-btn:hover {
    background-color: #666;
    opacity: 1;
}

.copy-btn.copied {
    background-color: #4CAF50;
}

/* Syntax highlighting - override Hugo's classes */
.highlight {
    margin: 20px 0;
}

.highlight pre {
    margin: 0;
}

/* Language label */
.code-block-wrapper pre[class*="language-"]::before {
    content: attr(class);
    position: absolute;
    top: 10px;
    left: 15px;
    font-size: 0.75rem;
    color: #999;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Series Navigation */
.series-nav {
    background-color: #f8f8f8;
    border-radius: 8px;
    padding: 25px;
    margin: 40px 0;
}

.series-nav h3 {
    margin: 0 0 20px 0;
    font-size: 1.1rem;
    color: #333;
}

.series-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.series-prev,
.series-next {
    display: flex;
    flex-direction: column;
    padding: 15px 20px;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    text-decoration: none;
    color: #333;
    transition: all 0.2s;
}

.series-prev:hover,
.series-next:hover {
    background-color: #333;
    color: #fff;
    border-color: #333;
}

.series-prev span:first-child,
.series-next span:first-child {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-bottom: 5px;
}

.series-title {
    font-weight: 500;
}

.series-next {
    text-align: right;
}

.series-disabled {
    display: flex;
    flex-direction: column;
    padding: 15px 20px;
    background-color: #f0f0f0;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    color: #999;
}

.series-disabled span:first-child {
    font-size: 0.85rem;
    opacity: 0.7;
}

@media (max-width: 600px) {
    .series-buttons {
        grid-template-columns: 1fr;
    }
    
    .series-info {
        margin-left: -20px;
        margin-right: -20px;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
    
    .series-header {
        padding: 12px 15px;
    }
    
    .series-name {
        font-size: 0.95rem;
    }
    
    .series-position {
        font-size: 0.8rem;
        padding: 3px 8px;
    }
}

.post-footer {
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.back-link {
    color: #666;
    text-decoration: none;
    font-size: 0.95rem;
}

.back-link:hover {
    color: #333;
}

.site-footer {
    background-color: #f8f8f8;
    border-top: 1px solid #eee;
    padding: 40px 20px;
    margin-top: 60px;
}

.footer-content {
    max-width: 960px;
    margin: 0 auto;
    text-align: center;
}

.footer-content p {
    color: #666;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.contact-link {
    color: #333;
    text-decoration: none;
    font-size: 0.95rem;
}

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

@media (max-width: 1024px) {
    .single-post-container {
        flex-direction: column;
    }
    
    .toc-sidebar {
        display: none;
    }
    
    .toc-mobile {
        display: block;
    }
    
    .single-post {
        max-width: 100%;
    }
}

@media (max-width: 600px) {
    main {
        padding: 15px;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .post h2 {
        font-size: 1.25rem;
    }
    
    .post-title-with-emoji {
        font-size: 1.5rem;
        gap: 15px;
    }
    
    .post-header {
        padding: 20px;
    }
    
    .post-emoji {
        font-size: 2.5rem;
    }
    
    .post-meta {
        gap: 15px;
        font-size: 0.85rem;
    }
    
    
    .site-header {
        padding: 15px;
    }
    
    .header-content {
        gap: 15px;
    }
    
    .site-title {
        font-size: 1.1rem;
    }
    
    .site-nav {
        gap: 15px;
    }
    
    .nav-link {
        font-size: 0.85rem;
    }
    
    .contact-btn {
        padding: 6px 15px;
        font-size: 0.85rem;
    }
    
    .single-post .content pre {
        padding: 15px;
        font-size: 0.85rem;
    }
    
    .copy-btn {
        padding: 4px 8px;
        font-size: 0.75rem;
    }
}

/* Breadcrumb Navigation */
.breadcrumb {
    margin: 20px auto;
    max-width: 960px;
    padding: 0 20px;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
    font-size: 0.9rem;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item::after {
    content: "›";
    margin: 0 10px;
    color: #999;
}

.breadcrumb-item:last-child::after {
    display: none;
}

.breadcrumb-item a {
    color: #666;
    text-decoration: none;
    transition: color 0.2s;
}

.breadcrumb-item a:hover {
    color: #333;
}

.breadcrumb-item.active {
    color: #333;
    font-weight: 500;
}

/* Page Headers */
.page-header {
    margin-bottom: 40px;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 1.1rem;
    color: #666;
}

/* Series Landing Page */
.series-listing {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

.series-grid {
    display: grid;
    gap: 20px;
    margin: 30px 0;
}

.series-grid h4 {
    color: #333;
    margin: 0 0 10px 0;
    font-size: 1.1rem;
}

.series-grid p {
    margin: 5px 0;
    color: #666;
    line-height: 1.5;
}

.series-grid > div {
    background-color: #f8f8f8;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #333;
}

/* Series List Page */
.series-card {
    background-color: #f8f8f8;
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.series-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.series-link {
    display: block;
    padding: 25px;
    text-decoration: none;
    color: #333;
}

.series-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.series-emoji {
    font-size: 2.5rem;
}

.series-title {
    font-size: 1.5rem;
    margin: 0;
}

.series-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
    font-size: 0.9rem;
}

.series-count {
    background-color: #333;
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
}

.series-category {
    color: #666;
}

.series-description {
    color: #666;
    line-height: 1.5;
    margin-bottom: 20px;
}

.series-preview h4 {
    font-size: 0.9rem;
    margin-bottom: 10px;
    color: #666;
}

.series-articles {
    list-style: decimal;
    padding-left: 20px;
    margin: 0;
}

.series-articles li {
    margin-bottom: 5px;
    font-size: 0.95rem;
}

.series-articles .more {
    list-style: none;
    font-style: italic;
    color: #666;
}

/* Insights and Taxonomy Pages */
.insights-listing,
.taxonomy-listing,
.taxonomy-single {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

/* Tag Cloud */
.taxonomy-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin: 40px 0;
}

.tag-cloud-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 16px;
    background-color: #f0f0f0;
    border-radius: 25px;
    text-decoration: none;
    color: #333;
    transition: all 0.2s;
}

.tag-cloud-item:hover {
    background-color: #333;
    color: #fff;
}

.tag-count {
    font-size: 0.85rem;
    opacity: 0.7;
}

.tag-small {
    font-size: 0.9rem;
}

.tag-medium {
    font-size: 1rem;
    font-weight: 500;
}

.tag-large {
    font-size: 1.2rem;
    font-weight: 600;
}

/* No content message */
.no-content {
    text-align: center;
    color: #666;
    font-style: italic;
    margin: 60px 0;
}

/* Mobile Breadcrumb */
@media (max-width: 600px) {
    .breadcrumb {
        margin: 15px auto;
    }
    
    .breadcrumb-list {
        font-size: 0.85rem;
    }
    
    .breadcrumb-item::after {
        margin: 0 6px;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .series-grid {
        grid-template-columns: 1fr;
    }
}