:root {
    --primary-bg: #000000;
    --sidebar-bg: #333333;
    --text-primary: #fafafa;
    --text-secondary: #919ea8;
    --border-color: #444444;
    --hover-bg: #444444;
    --active-bg: #555555;
    --primary-color: #ffff00;
    --primary-color-dark: #cccc00;
    --text-on-primary: #000000;
    --accent-yellow: #ffff00;
}

/* IBM Plex Mono Font Classes */
.ibm-plex-mono-thin {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 100;
    font-style: normal;
}

.ibm-plex-mono-extralight {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 200;
    font-style: normal;
}

.ibm-plex-mono-light {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 300;
    font-style: normal;
}

.ibm-plex-mono-regular {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 400;
    font-style: normal;
}

.ibm-plex-mono-medium {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 500;
    font-style: normal;
}

.ibm-plex-mono-semibold {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 600;
    font-style: normal;
}

.ibm-plex-mono-bold {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 700;
    font-style: normal;
}

.ibm-plex-mono-thin-italic {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 100;
    font-style: italic;
}

.ibm-plex-mono-extralight-italic {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 200;
    font-style: italic;
}

.ibm-plex-mono-light-italic {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 300;
    font-style: italic;
}

.ibm-plex-mono-regular-italic {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 400;
    font-style: italic;
}

.ibm-plex-mono-medium-italic {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 500;
    font-style: italic;
}

.ibm-plex-mono-semibold-italic {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 600;
    font-style: italic;
}

.ibm-plex-mono-bold-italic {
    font-family: "IBM Plex Mono", monospace;
    font-weight: 700;
    font-style: italic;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
}

body {
    font-family: "IBM Plex Mono", monospace;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--primary-bg);
    font-weight: 400;
}

/* Base Layout Structure */
.research-container {
    display: flex; /* Change to flex instead of grid */
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 300px;
    min-width: 300px; /* Ensure it doesn't shrink */
    background: var(--sidebar-bg);
    border-right: 2px solid var(--accent-yellow);
    padding: 2rem 1rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
}

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

.sidebar-header h2 {
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Search Bar */
.search-bar-container {
    padding: 0 0.5rem 1.5rem 0.5rem;
}

#search-bar {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

#search-bar:focus {
    outline: none;
    border-color: var(--accent-yellow);
    box-shadow: 0 0 5px rgba(255, 255, 0, 0.5);
}

#search-bar::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.directory-tree ul {
    list-style: none;
}

.directory-tree .main-categories > li {
    margin-bottom: 1rem;
}

.category-item {
    display: block;
    padding: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 4px;
    position: relative;
    font-family: "IBM Plex Mono", monospace;
    color: var(--text-primary);
}

.category-item:hover {
    background: var(--hover-bg);
    color: var(--accent-yellow);
}

.category-item.active {
    background: var(--active-bg);
    color: var(--accent-yellow);
}

.subcategory {
    margin-left: 1.5rem;
    margin-top: 0.5rem;
    display: block; /* Always visible by default */
}

.subcategory .item {
    display: block;
    padding: 0.4rem 0.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.95rem;
}

.subcategory .item:hover {
    background: var(--hover-bg);
    color: var(--accent-yellow);
}

/* Main Content */
.content {
    margin-left: 300px; /* Match sidebar width */
    flex: 1; /* Take up remaining space */
    padding: 2rem;
}

#content-area {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.welcome-message {
    padding: 2rem 0;
}

.welcome-message h1 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    font-weight: 500;
    font-family: "IBM Plex Mono", monospace;
}

.welcome-message p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2rem;
    font-family: "IBM Plex Mono", monospace;
    font-weight: 400;
}

.featured-sections {
    width: 100%;
    max-width: 1200px;
    margin: 3rem auto;
}

.featured-sections h2 {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 2rem;
}

.featured-grid {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.featured-item {
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: transform 0.2s ease;
    background: var(--sidebar-bg);
}

.featured-item:hover {
    transform: translateY(-2px);
    border-color: var(--accent-yellow);
}

.featured-item h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.featured-item p {
    color: var(--text-secondary);
}

/* Methodology Section */
.methodology-section {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 2px solid var(--accent-yellow);
}

.methodology-section h2 {
    margin-bottom: 2rem;
    font-size: 1.8rem;
}

/* Dataset Cards */
.dataset-list {
    margin: 3rem 0;
}

.dataset-list h2 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.dataset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.dataset-card {
    padding: 2rem;
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.dataset-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-yellow);
}

.dataset-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.dataset-card p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.keyword-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0.5rem 0 1.5rem;
}

.keyword-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: var(--primary-bg);
    color: var(--text-secondary);
    font-size: 0.82rem;
    line-height: 1.2;
    white-space: nowrap;
}

/* Compact layout for paper cards */
.papers-grid {
    grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
    gap: 1.25rem;
}

.papers-grid .dataset-card {
    padding: 1.25rem;
}

.papers-grid .dataset-card h3 {
    font-size: 1.18rem;
    line-height: 1.3;
    margin-bottom: 0.6rem;
}

.papers-grid .dataset-card p {
    font-size: 0.92rem;
    line-height: 1.45;
    margin-bottom: 0.85rem;
}

.papers-grid .keyword-row {
    margin: 0.3rem 0 0.8rem;
    gap: 0.35rem;
}

.papers-grid .keyword-chip {
    font-size: 0.72rem;
    padding: 0.18rem 0.45rem;
}

.papers-grid .card-actions {
    margin-top: 0.4rem;
}

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

.writing-list {
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.01);
}

.writing-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    align-items: center;
    padding: 0.95rem 0.25rem;
    border-bottom: 1px dashed var(--border-color);
}

.writing-item:last-child {
    border-bottom: 0;
}

.writing-main h3 {
    margin: 0 0 0.25rem;
    font-size: 1.08rem;
}

.writing-main p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.45;
}

.writing-meta {
    margin-top: 0.35rem !important;
    color: #7f8a93 !important;
    font-size: 0.78rem !important;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.writing-action .featured-link {
    margin-top: 0;
}

@media (max-width: 768px) {
    .writing-item {
        grid-template-columns: 1fr;
        align-items: start;
    }
}

.dataset-meta {
    list-style: none;
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--primary-bg);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.dataset-meta li {
    margin: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* PDF Container */
.pdf-container {
    width: 100%;
    height: 800px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    margin: 2rem 0;
    background: var(--sidebar-bg);
}

.pdf-header {
    padding: 1rem;
    border-bottom: 1px solid var(--accent-yellow);
    background: var(--active-bg);
}

.pdf-header h2 {
    margin: 0;
    font-size: 1.4rem;
    color: var(--text-primary);
}

.pdf-container object {
    width: 100%;
    height: calc(100% - 60px);
    background: white;
}

.pdf-fallback {
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
}

.pdf-fallback ul {
    list-style: none;
    margin: 1.5rem 0;
    padding: 0;
}

.pdf-fallback li {
    margin: 0.75rem 0;
}

.pdf-fallback a {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--active-bg);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.2s ease;
    border: 1px solid var(--accent-yellow);
}

.pdf-fallback a:hover {
    background: var(--accent-yellow);
    color: var(--text-on-primary);
}

.pdf-path {
    margin-top: 1.5rem;
    padding: 0.75rem;
    background: var(--primary-bg);
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9rem;
    word-break: break-all;
    color: var(--text-secondary);
}

/* Content Page Layout */
.content-page {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.content-body {
    width: 100%;
}

.content-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--accent-yellow);
    width: 100%;
}

.content-header h1 {
    font-size: 2.2rem;
    margin-bottom: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
    font-family: "IBM Plex Mono", monospace;
}

.metadata {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    gap: 1rem;
}

.metadata span:not(:last-child)::after {
    content: "•";
    margin-left: 1rem;
}

/* Introduction Section */
.introduction {
    margin-bottom: 3rem;
}

.introduction h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.introduction p {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.pdf-section {
    margin: 2rem 0;
    padding: 1rem;
    background: var(--sidebar-bg);
    border-radius: 8px;
}

.pdf-section h2 {
    margin-bottom: 1rem;
}

.pdf-link {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--active-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

.pdf-link:hover {
    background: var(--accent-yellow);
    color: var(--text-on-primary);
    transform: translateY(-1px);
}

.pdf-link::before {
    content: "📄";
    margin-right: 0.5rem;
}

/* Text Content Width Control */
.content-header,
.introduction > h2,
.introduction > p {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Category Overview */
.category-overview {
    width: 100%;
    max-width: 1200px;
    margin: 3rem auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.category-card {
    padding: 1.5rem;
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.category-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-yellow);
}

.category-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.category-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

.featured-link {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--active-bg);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    transition: background-color 0.2s ease, transform 0.2s ease;
    margin-top: 1rem;
    border: 1px solid var(--border-color);
}

.featured-link:hover {
    background: var(--accent-yellow);
    color: var(--text-on-primary);
    transform: translateY(-1px);
}

.featured-link:active {
    transform: translateY(0);
}

.featured-link::after {
    content: "→";
    margin-left: 0.5rem;
    transition: transform 0.2s ease;
}

.featured-link:hover::after {
    transform: translateX(2px);
}

/* Grid Layouts */
.featured-grid,
.dataset-grid,
.category-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    width: 100%;
    margin: 2rem 0;
}

/* Card Styles */
.featured-item,
.dataset-card,
.category-card {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* Responsive Design */
@media (max-width: 768px) {
    .research-container {
        flex-direction: column;
    }

    .sidebar {
        position: fixed;
        left: -300px;
        transition: left 0.3s ease;
        z-index: 1000;
    }

    .sidebar.active {
        left: 0;
    }

    .content {
        margin-left: 0;
        padding: 1rem;
    }

    .welcome-message h1 {
        font-size: 2rem;
    }
}

/* Feature Lists */
.feature-list {
    list-style: none;
    margin: 1rem 0;
    padding: 0;
}

.feature-list li {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.feature-list li::before {
    content: "•";
    position: absolute;
    left: 0.5rem;
    color: var(--accent-yellow);
}

/* Card Actions */
.card-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
}

.pdf-link {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.pdf-link:hover {
    background: var(--hover-bg);
    transform: translateY(-1px);
}

.pdf-link::before {
    content: "📄";
    margin-right: 0.5rem;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.benefit-card {
    padding: 1.5rem;
    background: var(--sidebar-bg);
    border-radius: 8px;
    transition: transform 0.2s ease;
    border: 1px solid var(--border-color);
}

.benefit-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-yellow);
}

.benefit-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.benefit-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Update existing category cards for better spacing */
.category-card {
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.category-card h3 {
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.category-card p {
    margin-bottom: 1rem;
}

/* Error Message */
.error-message {
    background: var(--sidebar-bg) !important;
    border: 1px solid var(--accent-yellow) !important;
    color: var(--text-primary) !important;
}

.error-details {
    background: var(--primary-bg) !important;
    border: 1px solid var(--border-color) !important;
}

/* Mobile Navigation */
.mobile-nav-toggle {
    background: var(--active-bg);
    color: var(--text-primary);
    border: 1px solid var(--accent-yellow);
}

/* Links */
a {
    color: var(--text-primary);
    transition: all 0.3s ease;
}

a:hover {
    color: var(--text-on-primary);
    background-color: var(--accent-yellow);
}

img, a {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
    pointer-events: none;
}

.pdf-link, .featured-link {
    pointer-events: all !important;
}

/* Blog Post Specific Styling */
.blog-post {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.blog-post .content-header h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.2;
}

.blog-post .metadata {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 3rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.blog-post .metadata span {
    margin-right: 1.5rem;
}

.content-blog-body {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.content-blog-body p {
    margin-bottom: 1.8rem;
}

.content-blog-body h2 {
    font-size: 2rem;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    color: var(--accent-yellow);
}

.content-blog-body h3 {
    font-size: 1.6rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.content-blog-body ul,
.content-blog-body ol {
    margin-bottom: 1.5rem;
    padding-left: 2.5rem;
    list-style: none;
}

.content-blog-body li {
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 0.5rem;
}

.content-blog-body li::before {
    content: "•";
    color: var(--accent-yellow);
    position: absolute;
    left: -1rem;
    font-size: 1.4rem;
    line-height: 1;
}

.content-blog-body pre {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: var(--font-mono);
}

.content-blog-body code {
    font-family: var(--font-mono);
    background-color: var(--border-color);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 85%;
}

.content-blog-body blockquote {
    border-left: 4px solid var(--accent-yellow);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-primary);
}

.content-blog-body img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 2rem auto;
    border-radius: 8px;
}

/* Responsive adjustments for blog posts */
@media (max-width: 768px) {
    .blog-post {
        padding: 2rem 1rem;
    }

    .blog-post .content-header h1 {
        font-size: 2.2rem;
    }

    .content-blog-body {
        font-size: 1rem;
    }

    .content-blog-body h2 {
        font-size: 1.8rem;
    }

    .content-blog-body h3 {
        font-size: 1.4rem;
    }
}