/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #007AFF;
    --primary-hover: #0056CC;
    --secondary-color: #5856D6;
    --text-primary: #1D1D1F;
    --text-secondary: #555555;
    --background-light: #F5F5F7;
    --background-white: #FFFFFF;
    --border-color: #D2D2D7;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --border-radius: 12px;
    --border-radius-small: 8px;
    --shadow-small: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 8px 32px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1400px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #FFFFFF 0%, #F8F9FA 100%);
    background-attachment: fixed;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-medium);
    border-bottom-color: rgba(0, 0, 0, 0.15);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    gap: 2rem;
}

.nav-left, .nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-left {
    gap: 1.5rem;
}

.nav-menu {
    list-style: none;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.nav-logo:hover {
    color: var(--primary-color);
}

.nav-logo-icon {
    color: var(--primary-color);
}

.nav-blog-link {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    padding: 6px 16px;
    background: rgba(0, 122, 255, 0.08);
    border-radius: 6px;
    transition: var(--transition);
}

.nav-blog-link:hover {
    background: rgba(0, 122, 255, 0.15);
    transform: translateY(-1px);
}

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    cursor: pointer;
}

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

.nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
    border-radius: 2px;
}

.nav-cta-btn {
    padding: 8px 20px;
    background: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.nav-cta-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Mobile Menu Toggle */
.nav-mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 28px;
    height: 28px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.nav-mobile-toggle span {
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

.nav-mobile-toggle.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.nav-mobile-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.nav-mobile-toggle.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

body.nav-open {
    overflow: hidden;
}

/* Main Content */
main {
    margin-top: 70px;
    min-height: 70vh;
}

/* Hero Section */
.hero-section {
    padding: 100px 0 80px;
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.03) 0%, rgba(88, 86, 214, 0.03) 100%);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 40px;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 800;
    margin-bottom: 28px;
    color: var(--text-primary);
    line-height: 1.1;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
    font-weight: 400;
}

.hero-section-small {
    padding: 80px 0 60px;
}

.hero-title-small {
    font-size: 3.5rem;
}

/* Blog/Taxonomy Intro Section */
.blog-intro,
.taxonomy-intro {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 40px 60px;
}

.blog-intro-content,
.taxonomy-content {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-small);
}

.blog-intro-content p,
.taxonomy-content p {
    margin-bottom: 20px;
}

.blog-intro-content p:last-child,
.taxonomy-content p:last-child {
    margin-bottom: 0;
}

/* Categories Section */
.categories-section {
    padding: 60px 0;
    background: white;
}

.categories-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.categories-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.categories-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0;
    color: var(--text-primary);
}

.articles-count {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 6px 14px;
    background: var(--background-light);
    border-radius: 20px;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.category-card {
    text-align: center;
    padding: 32px 24px;
    background: var(--background-light);
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    width: 100%;
    font-family: inherit;
}

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

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

.category-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.category-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.category-card.active h3 {
    color: white;
}

.category-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin: 0;
}

.category-card.active p {
    color: rgba(255, 255, 255, 0.9);
}

/* Blog List */
.blog-list {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 40px 100px;
}

.list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 60px;
}

.section-heading {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.view-toggle {
    display: flex;
    gap: 8px;
    background: var(--background-light);
    padding: 4px;
    border-radius: 8px;
}

.view-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: transparent;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

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

.view-btn.active {
    background: white;
    color: var(--primary-color);
    box-shadow: var(--shadow-small);
}

.view-btn svg {
    width: 18px;
    height: 18px;
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 1400px;
    margin: 0 auto;
}

/* Featured article (first) - spans full width */
.blog-item.featured {
    grid-column: 1 / -1;
}

@media (max-width: 1200px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }

    .blog-item.featured {
        grid-template-columns: 1fr;
    }
}

.articles-grid.list-view {
    grid-template-columns: 1fr;
    gap: 12px;
}

.articles-grid.list-view .blog-item {
    display: grid;
    grid-template-columns: 160px 1fr auto;
    grid-template-areas:
        "meta title tags"
        "meta desc tags";
    gap: 8px 24px;
    padding: 16px 24px;
    align-items: center;
}

.articles-grid.list-view .blog-item.featured {
    grid-template-columns: 160px 1fr auto;
}

.articles-grid.list-view .blog-item h3 {
    grid-area: title;
    font-size: 1.5rem;
    margin: 0;
    align-self: end;
    height: 3.9rem; /* Fixed height for 2 lines (1.5rem * 1.3 * 2) */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.articles-grid.list-view .blog-item.featured h3 {
    font-size: 1.625rem;
    height: 4.225rem; /* Fixed height for 2 lines (1.625rem * 1.3 * 2) */
}

.articles-grid.list-view .blog-item-meta {
    grid-area: meta;
    flex-direction: column;
    gap: 8px;
    margin: 0;
    align-self: center;
}

.articles-grid.list-view .blog-item p {
    grid-area: desc;
    font-size: 0.9375rem;
    margin: 0;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    align-self: start;
}

.articles-grid.list-view .blog-item .tags {
    grid-area: tags;
    grid-row: 1 / -1;
    margin: 0;
    padding: 0;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-end;
    align-items: center;
    align-self: center;
    gap: 6px;
    max-width: 280px;
}

/* Tablet default: force list view */
@media (max-width: 1024px) {
    .articles-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .articles-grid .blog-item {
        display: grid;
        grid-template-columns: 160px 1fr auto;
        grid-template-areas:
            "meta title tags"
            "meta desc tags";
        gap: 8px 24px;
        padding: 16px 24px;
        align-items: center;
    }

    .articles-grid .blog-item.featured {
        grid-template-columns: 160px 1fr auto;
    }

    .articles-grid .blog-item h3 {
        grid-area: title;
        font-size: 1.5rem;
        margin: 0;
        align-self: end;
        min-height: 0;
        height: auto;
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .articles-grid .blog-item.featured h3 {
        font-size: 1.625rem;
        min-height: 0;
        height: auto;
        -webkit-line-clamp: 3;
    }

    .articles-grid .blog-item-meta {
        grid-area: meta;
        flex-direction: column;
        gap: 8px;
        margin: 0;
        align-self: center;
    }

    .articles-grid .blog-item p {
        grid-area: desc;
        font-size: 0.9375rem;
        margin: 0;
        -webkit-line-clamp: 2;
        line-clamp: 2;
        align-self: start;
    }

    .articles-grid .blog-item .tags {
        grid-area: tags;
        grid-row: 1 / -1;
        margin: 0;
        padding: 0;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: flex-end;
        align-items: center;
        align-self: center;
        gap: 6px;
        max-width: 280px;
    }
}

/* Mobile adjustments for both grid and list view */
@media (max-width: 768px) {
    /* Grid view mobile adjustments */
    .blog-item {
        padding: 16px;
    }

    .blog-item h3 {
        font-size: 1.25rem;
        height: auto;
        min-height: 0;
        margin-bottom: 8px;
        -webkit-line-clamp: 3;
    }

    .blog-item.featured h3 {
        font-size: 1.375rem;
        height: auto;
        -webkit-line-clamp: 3;
    }

    .blog-item.featured p {
        -webkit-line-clamp: 2;
    }

    .blog-item p {
        font-size: 0.875rem;
        margin-bottom: 10px;
        -webkit-line-clamp: 2;
    }

    .blog-item-meta {
        margin-bottom: 10px;
    }

    .blog-item time {
        font-size: 0.75rem;
        padding: 3px 8px;
        height: 24px;
    }

    .badge-new {
        font-size: 0.625rem;
        padding: 3px 8px;
        height: 24px;
    }

    /* Mobile: use flex layout instead of grid for better control */
    .articles-grid .blog-item {
        display: flex;
        flex-direction: column;
        gap: 0;
        padding: 16px;
    }

    .articles-grid .blog-item-meta {
        flex-direction: row;
        margin-bottom: 10px;
    }

    .articles-grid .blog-item h3 {
        margin-bottom: 8px;
    }

    .articles-grid .blog-item p {
        margin-bottom: 10px;
    }

    .articles-grid .blog-item .tags {
        flex-direction: row;
        justify-content: flex-start;
        margin: 0;
    }

    /* List view mobile adjustments */
    .articles-grid.list-view .blog-item {
        grid-template-columns: 1fr;
        grid-template-areas:
            "meta"
            "title"
            "desc"
            "tags";
        gap: 10px;
        padding: 16px;
    }

    .articles-grid.list-view .blog-item h3 {
        font-size: 1.125rem;
        height: auto;
        -webkit-line-clamp: 3;
        align-self: start;
    }

    .articles-grid.list-view .blog-item.featured h3 {
        font-size: 1.125rem;
        height: auto;
        -webkit-line-clamp: 3;
    }

    .articles-grid.list-view .blog-item-meta {
        flex-direction: row;
        justify-content: flex-start;
        align-items: center;
    }

    .articles-grid.list-view .blog-item p {
        font-size: 0.875rem;
        -webkit-line-clamp: 3;
        line-clamp: 3;
    }

    .articles-grid.list-view .blog-item .tags {
        grid-row: auto;
        justify-content: flex-start;
        max-width: 100%;
    }
}

.blog-item {
    padding: 24px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-small);
    transition: var(--transition);
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
    position: relative;
    cursor: pointer;
}

.blog-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-large);
    border-color: rgba(0, 122, 255, 0.1);
}

.blog-item h3 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.3;
    height: 5.37rem; /* Fixed height for exactly 3 lines (1.375rem * 1.3 * 3) */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-item.featured h3 {
    font-size: 1.75rem;
    height: auto;
}

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

.blog-item h3 a:hover {
    color: var(--primary-color);
}

.blog-item-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    min-height: 32px;
}

.blog-item time {
    color: var(--text-secondary);
    font-size: 0.8125rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    background: var(--background-light);
    border-radius: 6px;
    height: 28px;
}

.badge-new {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    background: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
    color: white;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
    height: 28px;
}

.blog-item p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin: 0 0 14px 0;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-item.featured p {
    font-size: 1rem;
    -webkit-line-clamp: 4;
}

/* Stretched link - makes entire card clickable */
.stretched-link::after {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1;
    content: "";
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 40px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-small);
}

.empty-icon {
    font-size: 5rem;
    margin-bottom: 24px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.empty-state p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.btn-back:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Tags */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
    padding-top: 16px;
}

.tag {
    display: inline-block;
    background: rgba(0, 122, 255, 0.08);
    color: var(--primary-color);
    padding: 5px 11px;
    border-radius: 50px;
    font-size: 0.8125rem;
    font-weight: 600;
    transition: var(--transition);
}

.tag-more {
    display: inline-block;
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-secondary);
    padding: 5px 11px;
    border-radius: 50px;
    font-size: 0.8125rem;
    font-weight: 600;
}

.tag:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Single Blog Post */
.blog-post {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px;
}

.blog-post header {
    position: static;
    background: none;
    border: none;
    margin-bottom: 60px;
    text-align: center;
    padding: 0;
    backdrop-filter: none;
    height: auto;
}

.blog-post h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--text-primary);
    line-height: 1.1;
}

.blog-post time {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 500;
    display: block;
    margin-bottom: 24px;
}

.blog-post .tags {
    justify-content: center;
    margin-top: 24px;
}

.featured-image {
    width: 100%;
    height: auto;
    margin: 40px 0;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
}

/* Blog Content */
.content {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text-secondary);
    background: white;
    padding: 50px 60px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-small);
}

.content > h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--text-primary);
    line-height: 1.1;
    text-align: center;
}

.article-meta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.article-meta time {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 6px 14px;
    background: var(--background-light);
    border-radius: 6px;
}

.article-meta .tags {
    margin: 0;
    justify-content: center;
}

.content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-top: 50px;
    margin-bottom: 20px;
    color: var(--text-primary);
    line-height: 1.2;
}

.content h2:first-child {
    margin-top: 0;
}

.content h3 {
    font-size: 2rem;
    font-weight: 600;
    margin-top: 35px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.content p {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.content a {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
    font-weight: 500;
}

.content a:hover {
    border-bottom-color: var(--primary-color);
}

.content ul,
.content ol {
    margin-bottom: 20px;
    padding-left: 40px;
}

.content li {
    margin-bottom: 10px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    margin: 30px 0;
}

.content code {
    background: var(--background-light);
    padding: 4px 10px;
    border-radius: 6px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--text-primary);
}

.content pre {
    background: var(--background-light);
    padding: 20px;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 30px 0;
    border: 1px solid var(--border-color);
}

.content pre code {
    background: none;
    padding: 0;
}

.content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 24px;
    margin: 30px 0;
    font-style: italic;
    color: var(--text-secondary);
    font-size: 1.3rem;
}

/* Keyboard Shortcuts Table */
.shortcuts-table {
    margin: 24px 0;
    overflow-x: auto;
}

.shortcuts-table table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: white;
    border-radius: var(--border-radius-small);
    overflow: hidden;
    box-shadow: var(--shadow-small);
}

.shortcuts-table thead {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.shortcuts-table th {
    padding: 16px 20px;
    text-align: left;
    font-weight: 600;
    font-size: 1rem;
    color: white;
    border: none;
}

.shortcuts-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.shortcuts-table tr:last-child td {
    border-bottom: none;
}

.shortcuts-table tbody tr {
    transition: var(--transition);
}

.shortcuts-table tbody tr:hover {
    background: var(--background-light);
}

.shortcuts-table tbody tr:nth-child(even) {
    background: rgba(245, 245, 247, 0.3);
}

.shortcuts-table tbody tr:nth-child(even):hover {
    background: var(--background-light);
}

/* Keyboard Key Styling */
kbd {
    display: inline-block;
    padding: 4px 8px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 0.9em;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
    background: linear-gradient(180deg, #FFFFFF 0%, #F5F5F7 100%);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1),
                inset 0 -2px 0 0 rgba(0, 0, 0, 0.1);
    white-space: nowrap;
    margin: 0 2px;
}

.content kbd {
    padding: 4px 8px;
}

/* FAQ Accordion */
.content details {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    margin-bottom: 16px;
    padding: 0;
    transition: var(--transition);
}

.content details:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-small);
}

.content details[open] {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
}

.content summary {
    cursor: pointer;
    padding: 20px 24px;
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
}

.content summary::-webkit-details-marker {
    display: none;
}

.content summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
    transition: transform 0.3s ease;
}

.content details[open] summary::after {
    content: '−';
    transform: rotate(90deg);
}

.content .faq-answer {
    padding: 0 24px 24px 24px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.content .faq-answer p:last-child,
.content .faq-answer ul:last-child {
    margin-bottom: 0;
}

/* Footer */
.footer {
    margin-top: 120px;
    padding: 60px 0;
    border-top: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
    text-align: center;
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.separator {
    color: var(--border-color);
    font-weight: 300;
}

.footer-copy {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 400;
}

/* Responsive */
@media (max-width: 1024px) {
    .nav-container {
        gap: 1rem;
        position: relative;
    }

    .nav-mobile-toggle {
        display: flex;
        order: 3;
        margin-left: auto;
    }

    .nav-left {
        order: 1;
        flex: 0 1 auto;
        z-index: 1001;
    }

    /* Mobile menu - exactly like main site */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--background-white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-medium);
        padding: 2rem 0;
        z-index: 999;
        list-style: none;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        display: block;
    }

    .nav-menu .nav-link {
        font-size: 1rem;
        font-weight: 500;
        padding: 12px 20px;
        width: auto;
        text-align: center;
        color: var(--text-secondary);
        display: block;
    }

    .nav-menu .nav-link.active {
        color: var(--primary-color);
        font-weight: 600;
    }

    .nav-menu .nav-link.active::after {
        display: none;
    }

    .nav-blog-link {
        display: inline-block;
        order: 2;
        padding: 8px 18px;
        font-size: 0.9375rem;
        z-index: 1001;
    }

    .nav-cta-btn {
        padding: 12px 32px;
        font-size: 0.95rem;
        border-radius: 25px;
    }

    /* Hide view toggle on mobile - grid only */
    .view-toggle {
        display: none;
    }

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

@media (max-width: 1024px) and (min-width: 481px) {
    /* Tablet-specific category chips - medium size, 3 columns */
    .categories-section {
        padding: 30px 0 40px;
        background: white;
    }

    .categories-container {
        padding: 0 30px;
    }

    .categories-header {
        margin-bottom: 24px;
    }

    .categories-title {
        font-size: 1.25rem;
        font-weight: 700;
    }

    .articles-count {
        font-size: 0.875rem;
        padding: 5px 12px;
    }

    .category-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
    }

    .category-card {
        padding: 16px 12px;
        border-radius: 10px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 8px;
        background: var(--background-light);
        border: 2px solid transparent;
        min-height: auto;
        width: 100%;
        text-align: center;
    }

    .category-card:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-small);
        border-color: var(--primary-color);
    }

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

    .category-icon {
        font-size: 1.75rem;
        margin-bottom: 0;
        line-height: 1;
    }

    .category-card h3 {
        font-size: 0.9375rem;
        margin-bottom: 0;
        font-weight: 600;
        line-height: 1.2;
        display: block;
    }

    .category-card.active h3 {
        color: white;
    }

    .category-card p {
        display: none;
    }
}

@media (max-width: 480px) {
    .blog-intro,
    .taxonomy-intro {
        padding: 0 20px 40px;
    }

    .blog-intro-content,
    .taxonomy-content {
        padding: 24px;
        font-size: 1rem;
    }

    .nav-container {
        padding: 0 20px;
    }

    .nav-menu li .nav-link {
        font-size: 1.125rem;
        padding: 12px 0;
    }

    .hero-section {
        padding: 60px 0 40px;
    }

    .hero-content {
        padding: 0 20px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    /* Mobile grid improvements */
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 0 20px;
    }

    .blog-item {
        padding: 24px;
    }

    .blog-item h3 {
        font-size: 1.5rem;
    }

    .blog-item.featured h3 {
        font-size: 1.75rem;
    }

    .blog-item p {
        font-size: 0.9375rem;
        -webkit-line-clamp: 2;
    }

    .blog-list {
        padding: 0;
    }

    .list-header {
        padding: 0 20px 20px;
    }

    /* Compact category filtering on mobile - 2 rows of chips */
    .categories-section {
        padding: 20px 0 30px;
        background: transparent;
    }

    .categories-container {
        padding: 0 20px;
    }

    .categories-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 12px;
        margin-bottom: 14px;
    }

    .categories-title {
        font-size: 0.9375rem;
        font-weight: 600;
        color: var(--text-secondary);
    }

    .articles-count {
        font-size: 0.8125rem;
        padding: 4px 10px;
        white-space: nowrap;
    }

    .category-grid {
        display: flex;
        flex-wrap: wrap;
        gap: 7px;
        padding: 0;
    }

    .category-card {
        flex: 0 0 auto;
        padding: 7px 12px;
        border-radius: 50px;
        display: inline-flex;
        align-items: center;
        gap: 5px;
        background: var(--background-white);
        border: 1.5px solid var(--border-color);
        min-height: auto;
        white-space: nowrap;
        font-size: 0.8125rem;
        width: auto !important;
        max-width: fit-content;
        text-align: center;
    }

    .category-card h3 {
        display: inline;
        white-space: nowrap;
        text-align: center;
    }

    .category-card:hover {
        transform: none;
        box-shadow: none;
    }

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

    .category-icon {
        font-size: 1rem;
        margin-bottom: 0;
        line-height: 1;
    }

    .category-card h3 {
        font-size: 0.8125rem;
        margin-bottom: 0;
        font-weight: 600;
        line-height: 1;
    }

    .category-card p {
        display: none;
    }

    .blog-list {
        padding: 30px 20px 60px;
    }

    .list-header {
        margin-bottom: 30px;
    }

    .section-heading {
        font-size: 1.5rem;
    }

    .blog-item {
        padding: 24px;
    }

    .blog-item h3 {
        font-size: 1.5rem;
    }

    .blog-item p {
        font-size: 1rem;
        line-height: 1.6;
        margin: 16px 0;
    }

    .blog-item time {
        font-size: 0.85rem;
        padding: 4px 10px;
    }

    .tags {
        gap: 8px;
        margin-top: 16px;
    }

    .tag {
        font-size: 0.75rem;
        padding: 6px 12px;
    }

    .blog-post {
        padding: 0 20px;
    }

    .blog-post h1 {
        font-size: 2rem;
    }

    .content {
        font-size: 1rem;
        padding: 24px 16px;
        line-height: 1.7;
    }

    .content > h1 {
        font-size: 1.875rem;
        margin-bottom: 16px;
    }

    .article-meta {
        gap: 10px;
        margin-bottom: 20px;
        padding-bottom: 16px;
    }

    .article-meta time {
        font-size: 0.85rem;
        padding: 4px 10px;
    }

    .content h2 {
        font-size: 1.625rem;
        margin-top: 30px;
        margin-bottom: 14px;
    }

    .content h3 {
        font-size: 1.25rem;
        margin-top: 24px;
        margin-bottom: 12px;
    }

    .content p {
        margin-bottom: 16px;
    }

    .content ul,
    .content ol {
        margin-bottom: 16px;
        padding-left: 28px;
    }

    .content li {
        margin-bottom: 8px;
        line-height: 1.6;
    }

    .content img {
        margin: 20px 0;
    }

    .content pre {
        padding: 16px;
        margin: 20px 0;
    }

    .content blockquote {
        padding-left: 16px;
        margin: 20px 0;
        font-size: 1.1rem;
    }

    /* Shortcuts table responsive */
    .shortcuts-table {
        margin: 16px 0;
    }

    .shortcuts-table th,
    .shortcuts-table td {
        padding: 10px 8px;
        font-size: 0.875rem;
    }

    kbd {
        padding: 3px 6px;
        font-size: 0.8em;
        margin: 0 1px;
    }

    .footer-content {
        padding: 0 20px;
    }

    .footer-links {
        gap: 12px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .nav-logo span {
        font-size: 1.125rem;
    }

    .blog-item {
        padding: 20px;
    }

    .blog-item h3 {
        font-size: 1.375rem;
    }

    .blog-item p {
        font-size: 0.9375rem;
    }

    .blog-post h1 {
        font-size: 1.75rem;
    }

    .content {
        padding: 20px 14px;
    }

    .content h2 {
        font-size: 1.5rem;
        margin-top: 24px;
        margin-bottom: 12px;
    }

    .content h3 {
        font-size: 1.125rem;
        margin-top: 20px;
        margin-bottom: 10px;
    }

    .content p {
        margin-bottom: 14px;
    }

    .content ul,
    .content ol {
        margin-bottom: 14px;
        padding-left: 24px;
    }

    .content li {
        margin-bottom: 6px;
    }

    .shortcuts-table th,
    .shortcuts-table td {
        padding: 8px 6px;
        font-size: 0.8125rem;
    }

    .empty-state {
        padding: 60px 20px;
    }

    .empty-icon {
        font-size: 3.5rem;
    }

    .empty-state h3 {
        font-size: 1.5rem;
    }

    .empty-state p {
        font-size: 1rem;
    }
}

/* FAQ Mobile Optimization */
@media (max-width: 768px) {
  article details {
    margin-bottom: 0.75rem;
    border-bottom: 1px solid #e5e7eb;
  }

  article details summary {
    padding: 0.875rem 0;
    font-size: 1rem;
    line-height: 1.35;
    cursor: pointer;
    font-weight: 600;
  }

  article details summary strong {
    font-weight: 600;
  }

  article details .faq-answer {
    padding: 0.5rem 0 0.75rem 0;
    font-size: 0.9375rem;
    line-height: 1.5;
  }

  article details .faq-answer p {
    margin-bottom: 0.625rem;
  }

  article details .faq-answer p:last-child {
    margin-bottom: 0;
  }

  article details .faq-answer ul,
  article details .faq-answer ol {
    margin: 0.5rem 0;
    padding-left: 1.125rem;
  }

  article details .faq-answer li {
    margin-bottom: 0.25rem;
  }

  article details .faq-answer kbd {
    padding: 0.125rem 0.375rem;
    font-size: 0.8125rem;
  }

  article details[open] summary {
    margin-bottom: 0.625rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #e5e7eb;
  }

  /* Make FAQ headings more compact */
  article h2#frequently-asked-questions {
    margin-bottom: 1rem;
    font-size: 1.5rem;
  }
}

/* Extra small screens */
@media (max-width: 480px) {
  article details summary {
    font-size: 0.9375rem;
    padding: 0.75rem 0;
  }

  article details .faq-answer {
    font-size: 0.875rem;
  }

  article details .faq-answer kbd {
    font-size: 0.75rem;
    padding: 0.1rem 0.3rem;
  }
}

/* Language Switcher */
.language-switcher {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    margin-top: 12px;
    padding: 8px 14px;
    background: var(--background-light);
    border-radius: 20px;
    max-width: 100%;
}

.lang-label {
    font-weight: 600;
    color: var(--text-primary);
}

.lang-separator {
    color: var(--border-color);
}

.lang-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

@media (max-width: 480px) {
    .language-switcher {
        margin-top: 8px;
        padding: 6px 12px;
        font-size: 0.8125rem;
    }
}