/* Elegant Academic Design System */

:root {
  /* Color Palette - Refined Academic */
  --ink: #2c2c2c;
  --ink-light: #4a4a4a;
  --ink-lighter: #6a6a6a;
  --paper: #ffffff;
  --paper-dark: #fafafa;
  --paper-darker: #f5f5f5;
  --accent: #0050a0;
  --accent-light: #0066cc;
  --accent-dark: #003d7a;
  --success: #0d7a0d;
  --warning: #cc7700;
  --error: #cc0000;

  /* Typography - Improved readability */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Monaco', 'Consolas', 'Liberation Mono', 'Courier New', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 5rem;

  /* Layout */
  --content-width: 1400px;
  --sidebar-width: 280px;
  --gap: 2rem;

  /* Shadows */
  --shadow-subtle: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 16px rgba(0,0,0,0.12);
  --shadow-xl: 0 16px 32px rgba(0,0,0,0.16);

  /* Borders */
  --border-width: 1px;
  --border-color: rgba(0,0,0,0.08);
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

/* Dark Mode Theme */
[data-theme="dark"] {
  /* Dark Mode Colors */
  --ink: #e8e8e8;
  --ink-light: #c8c8c8;
  --ink-lighter: #a8a8a8;
  --paper: #1a1a1a;
  --paper-dark: #222222;
  --paper-darker: #2a2a2a;
  --accent: #4d9fff;
  --accent-light: #6db3ff;
  --accent-dark: #3385ff;
  --success: #4ade80;
  --warning: #fbbf24;
  --error: #f87171;

  /* Dark Mode Shadows */
  --shadow-subtle: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 16px rgba(0,0,0,0.6);
  --shadow-xl: 0 16px 32px rgba(0,0,0,0.7);

  /* Dark Mode Borders */
  --border-color: rgba(255,255,255,0.1);
}

/* Smooth theme transitions */
* {
  transition: background-color 300ms ease, color 300ms ease, border-color 300ms ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility: Skip to main content */
.skip-to-main {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--accent);
  color: white;
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  font-weight: 600;
  z-index: 10000;
  border-radius: 0 0 var(--radius-md) 0;
}

.skip-to-main:focus {
  top: 0;
}

/* Screen reader only text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  font-weight: 400;
  letter-spacing: -0.011em;
  text-rendering: optimizeLegibility;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.35;
  margin-top: 0;
  margin-bottom: var(--space-md);
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--ink);
}

h1 { font-size: 2.5rem; font-weight: 700; }
h2 { font-size: 2rem; font-weight: 600; }
h3 { font-size: 1.625rem; font-weight: 600; }
h4 { font-size: 1.375rem; font-weight: 600; }
h5 { font-size: 1.125rem; font-weight: 600; }
h6 { font-size: 1rem; font-weight: 600; }

p {
  margin-bottom: var(--space-md);
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--ink);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-dark);
}

/* Navigation Header */
.elegant-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(254, 254, 254, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: var(--border-width) solid var(--border-color);
}

.header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-identity {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
}

.site-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
}

.site-tagline {
  font-size: 0.875rem;
  color: var(--ink-lighter);
  font-style: italic;
}

.nav-primary ul {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-primary a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-light);
  position: relative;
  padding-bottom: 2px;
}

.nav-primary a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-base);
}

.nav-primary a:hover::after,
.nav-primary a.active::after {
  width: 100%;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Breadcrumb Navigation */
.breadcrumb-nav {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg) 0;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  list-style: none;
  font-size: 0.875rem;
  color: var(--ink-lighter);
  padding: 0;
  margin: 0 0 var(--space-md) 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.breadcrumb a {
  color: var(--ink-lighter);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--accent);
}

.breadcrumb-separator {
  color: var(--ink-lighter);
  user-select: none;
}

.breadcrumb [aria-current="page"] {
  color: var(--ink);
  font-weight: 500;
}

/* Hero Section */
.hero-elegant {
  padding: var(--space-xxl) var(--space-lg);
  text-align: center;
  background: linear-gradient(180deg, var(--paper-dark) 0%, var(--paper) 100%);
}

.hero-title {
  font-size: 3.5rem;
  font-family: var(--font-display);
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--ink) 0%, var(--accent-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--ink-light);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-display);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--ink-lighter);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Artifact Grid System */
.artifacts-section {
  padding: var(--space-xl) var(--space-lg);
  max-width: var(--content-width);
  margin: 0 auto;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: var(--border-width) solid var(--border-color);
}

.section-title {
  font-size: 2rem;
  margin: 0;
}

.filter-controls {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.filter-group {
  display: flex;
  gap: var(--space-sm);
}

.filter-btn {
  padding: var(--space-xs) var(--space-md);
  border: var(--border-width) solid var(--border-color);
  background: var(--paper);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.artifacts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--gap);
}

/* Artifact Card */
.artifact-card {
  background: var(--paper);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  position: relative;
  display: flex;
  flex-direction: column;
}

.artifact-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-light);
}

.artifact-header {
  padding: var(--space-lg);
  background: linear-gradient(135deg, var(--paper-dark) 0%, var(--paper) 100%);
  border-bottom: var(--border-width) solid var(--border-color);
}

.artifact-type {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--accent);
  color: white;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.artifact-type.paper { background: #6b46c1; }
.artifact-type.package { background: #0891b2; }
.artifact-type.library { background: #059669; }
.artifact-type.dataset { background: #ea580c; }
.artifact-type.tool { background: #dc2626; }

.artifact-title {
  font-size: 1.25rem;
  margin: var(--space-sm) 0;
  font-family: var(--font-display);
}

.artifact-meta {
  display: flex;
  gap: var(--space-md);
  font-size: 0.8rem;
  color: var(--ink-lighter);
}

.artifact-body {
  padding: var(--space-lg);
  flex: 1;
}

.artifact-description {
  color: var(--ink);
  font-size: 1rem;
  margin-bottom: var(--space-md);
  line-height: 1.65;
}

.artifact-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.tech-badge {
  padding: 2px 8px;
  background: var(--paper-darker);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--ink-light);
}

.artifact-registries {
  display: flex;
  gap: var(--space-sm);
  padding-top: var(--space-md);
  border-top: var(--border-width) solid var(--border-color);
}

.registry-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: var(--paper-dark);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.registry-link:hover {
  background: var(--accent);
  color: white;
}

/* Documentation Showcase */
.doc-preview {
  background: var(--paper-darker);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.doc-toc {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  padding-left: var(--space-md);
  border-left: 2px solid var(--accent-light);
}

.doc-section {
  margin-bottom: var(--space-xl);
}

/* Metrics Display */
.metrics-bar {
  display: flex;
  justify-content: space-around;
  padding: var(--space-md);
  background: var(--paper-darker);
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
}

.metric {
  text-align: center;
}

.metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--ink-lighter);
  text-transform: uppercase;
}

/* Featured Section */
.featured-artifacts {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--gap);
  margin: var(--space-xl) 0;
}

.featured-primary {
  grid-row: span 2;
}

.featured-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--ink);
  color: var(--paper);
}

.featured-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.featured-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-xl);
  background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, transparent 100%);
}

/* Responsive Grid */
@media (max-width: 1200px) {
  .featured-artifacts {
    grid-template-columns: 1fr 1fr;
  }

  .featured-primary {
    grid-column: span 2;
    grid-row: span 1;
  }
}

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

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

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

  .hero-stats {
    flex-direction: column;
    gap: var(--space-lg);
  }

  .header-inner {
    flex-direction: column;
    gap: var(--space-md);
  }

  .nav-primary ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-section {
    align-items: center;
  }

  .social-links {
    justify-content: center;
  }
}

/* Main Content Container */
.main-container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

/* Post List Styles */
.post-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.post-item {
  background: var(--paper);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.post-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-light);
}

.post-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent);
  transform: translateX(-100%);
  transition: transform var(--transition-base);
}

.post-item:hover::before {
  transform: translateX(0);
}

.post-date {
  font-size: 0.875rem;
  color: var(--ink-lighter);
  font-weight: 500;
  letter-spacing: 0.025em;
  margin-bottom: var(--space-sm);
}

.post-title {
  font-size: 1.5rem;
  margin: var(--space-sm) 0 var(--space-md);
  font-family: var(--font-display);
}

.post-title a {
  color: var(--ink);
  transition: color var(--transition-fast);
}

.post-title a:hover {
  color: var(--accent);
}

.post-excerpt {
  color: var(--ink);
  line-height: 1.7;
  margin-bottom: var(--space-md);
  font-size: 1.05rem;
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--paper-darker);
  color: var(--ink-light);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.tag:hover {
  background: var(--accent);
  color: white;
}

/* View All Link */
.view-all-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.view-all-link:hover {
  color: var(--accent-dark);
  transform: translateX(2px);
}

/* Content Styling for Posts and Pages - Enhanced Typography */
.content {
  line-height: 1.8;
  color: var(--ink);
  font-size: 1.0625rem; /* 17px base for better readability */
}

.content h1,
.content h2,
.content h3,
.content h4,
.content h5,
.content h6 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  font-family: var(--font-display);
  font-weight: 600;
  scroll-margin-top: 100px; /* Offset for sticky header */
  position: relative;
}

/* Heading anchor links */
.content h2:hover::before,
.content h3:hover::before {
  content: '#';
  position: absolute;
  left: -1.5rem;
  color: var(--accent-light);
  opacity: 0.5;
  font-weight: 400;
}

.content p {
  margin-bottom: var(--space-lg);
  max-width: 70ch; /* Optimal reading width */
}

.content p:first-of-type {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--ink-light);
}

/* Drop cap for first paragraph */
.content > p:first-of-type::first-letter {
  font-size: 3.5em;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 0.9;
  float: left;
  margin: 0.1em 0.1em 0 0;
  color: var(--accent);
}

.content ul,
.content ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

.content li {
  margin-bottom: var(--space-sm);
  line-height: 1.7;
  font-size: 1.05rem;
}

.content blockquote {
  margin: var(--space-lg) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--accent);
  background: var(--paper-dark);
  font-style: italic;
}

.content pre {
  background: var(--paper-darker);
  color: var(--ink);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--space-lg) 0;
  font-size: 0.9rem;
  line-height: 1.65;
}

.content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--paper-darker);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

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

.content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
}

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
}

.content th,
.content td {
  padding: var(--space-sm) var(--space-md);
  border: var(--border-width) solid var(--border-color);
  text-align: left;
}

.content th {
  background: var(--paper-dark);
  font-weight: 600;
}

.content hr {
  border: none;
  height: var(--border-width);
  background: var(--border-color);
  margin: var(--space-xl) 0;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.pagination li {
  list-style: none;
}

.pagination a,
.pagination span {
  padding: var(--space-xs) var(--space-md);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.pagination a:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.pagination .active span {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Breadcrumb Navigation */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--ink-lighter);
  margin-bottom: var(--space-lg);
}

.breadcrumb a {
  color: var(--ink-lighter);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--accent);
}

.breadcrumb-separator {
  color: var(--ink-lighter);
}

/* Single Post Styles with Sidebar Layout */
.single-post-layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--space-3xl);
  max-width: 1400px;
  margin: 0 auto;
  align-items: start;
}

.post-sidebar {
  position: sticky;
  top: 80px;
}

.single-post {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.post-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: var(--border-width) solid var(--border-color);
}

.post-header .post-title {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  font-family: var(--font-display);
  line-height: 1.2;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  color: var(--ink-lighter);
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
}

.post-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.post-meta i {
  font-size: 0.875rem;
}

/* Post Navigation */
.post-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  margin-top: var(--space-xxl);
  padding-top: var(--space-xl);
  border-top: var(--border-width) solid var(--border-color);
}

.nav-prev,
.nav-next {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  background: var(--paper-dark);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.nav-prev:hover,
.nav-next:hover {
  background: var(--paper-darker);
  transform: translateY(-2px);
}

.nav-next {
  text-align: right;
  align-items: flex-end;
}

.nav-label {
  font-size: 0.875rem;
  color: var(--ink-lighter);
  margin-bottom: var(--space-xs);
}

.nav-title {
  font-size: 1.1rem;
  color: var(--ink);
  font-weight: 500;
}

/* Social Share Buttons */
.social-share {
  display: flex;
  gap: var(--space-sm);
  margin: var(--space-lg) 0;
}

.share-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  background: var(--paper-dark);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.share-button:hover {
  background: var(--accent);
  color: white;
}

/* Grid Layouts */
.grid-container {
  display: grid;
  gap: var(--gap);
  margin-top: var(--space-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

/* Content Cards (for projects, publications, etc.) */
.content-card {
  background: var(--paper);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.content-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-light);
}

.content-card h3 {
  margin: 0;
  font-size: 1.25rem;
  font-family: var(--font-display);
}

.content-card h3 a {
  color: var(--ink);
  transition: color var(--transition-fast);
}

.content-card h3 a:hover {
  color: var(--accent);
}

.content-card .summary {
  color: var(--ink-light);
  font-size: 0.9rem;
  line-height: 1.6;
  flex-grow: 1;
}

/* Responsive Grids */
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* Publication List Styles */
.publication-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.publication-card {
  background: var(--paper);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
}

.publication-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-light);
}

.publication-title {
  font-size: 1.25rem;
  margin: 0 0 var(--space-sm) 0;
  font-family: var(--font-display);
}

.publication-title a {
  color: var(--ink);
  transition: color var(--transition-fast);
}

.publication-title a:hover {
  color: var(--accent);
}

.publication-authors {
  font-size: 0.9rem;
  color: var(--ink-light);
  margin-bottom: var(--space-xs);
}

.publication-venue {
  font-size: 0.875rem;
  color: var(--ink-lighter);
  font-style: italic;
  margin-bottom: var(--space-xs);
}

.publication-links {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
  font-size: 0.875rem;
}

.publication-links a {
  color: var(--accent);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.publication-links a:hover {
  color: var(--accent-dark);
}

/* Utility Classes */
.mb-3 {
  margin-bottom: var(--space-xl);
}

.text-secondary {
  color: var(--ink-light);
}

/* Variable fallbacks for templates using old variable names */
.publication-card,
.content-card,
.post-item {
  --text-secondary: var(--ink-light);
  --accent-color: var(--accent);
}

/* Footer */
.elegant-footer {
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-xxl) var(--space-lg) var(--space-xl);
  margin-top: var(--space-xxl);
}

.footer-content {
  max-width: var(--content-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--gap);
  margin-bottom: var(--space-xl);
}

.footer-about h3 {
  color: var(--paper);
  font-family: var(--font-display);
}

.footer-about p {
  color: rgba(255,255,255,0.7);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

.footer-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer-section h4 {
  color: var(--paper);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 var(--space-sm) 0;
}

.social-links {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.7);
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-2px);
}

.footer-bottom {
  max-width: var(--content-width);
  margin: 0 auto;
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-bottom .copyright {
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  margin: 0;
}

.footer-bottom .accessibility-note {
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  margin: 0;
}

.footer-bottom .accessibility-note a {
  color: rgba(255,255,255,0.7);
  transition: color var(--transition-fast);
}

.footer-bottom .accessibility-note a:hover {
  color: white;
}

/* Project Portfolio Styles */
.projects-portfolio {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.portfolio-header {
  text-align: center;
  margin-bottom: var(--space-xxl);
}

.portfolio-header h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  font-family: var(--font-display);
}

.portfolio-description {
  font-size: 1.25rem;
  color: var(--ink-light);
  max-width: 800px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

.portfolio-filters {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  margin-bottom: var(--space-xl);
}

.filter-group {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: var(--gap);
  margin-bottom: var(--space-xl);
}

.project-card {
  background: var(--paper);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  position: relative;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--accent-light);
}

.project-card[data-featured="true"] {
  border-color: var(--accent);
  border-width: 2px;
}

.card-header {
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  background: linear-gradient(135deg, var(--paper-dark) 0%, var(--paper) 100%);
}

.card-badges {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.status-badge,
.type-badge,
.featured-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status-badge {
  background: var(--paper-darker);
  color: var(--ink-light);
}

.status-active {
  background: #dcfce7;
  color: #166534;
}

.status-maintained {
  background: #dbeafe;
  color: #1e3a8a;
}

.status-experimental {
  background: #fef3c7;
  color: #92400e;
}

.status-archived {
  background: #f3f4f6;
  color: #6b7280;
}

.type-badge {
  background: var(--accent);
  color: white;
}

.featured-badge {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  color: white;
}

.card-title {
  margin: 0;
  font-size: 1.5rem;
  font-family: var(--font-display);
}

.card-title a {
  color: var(--ink);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.card-title a:hover {
  color: var(--accent);
}

.card-body {
  padding: 0 var(--space-lg) var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-description {
  color: var(--ink);
  line-height: 1.6;
  margin-bottom: var(--space-md);
  font-size: 1rem;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.tech-tag {
  padding: 4px 8px;
  background: var(--paper-darker);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--ink-light);
  font-weight: 500;
}

.card-links {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.card-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--paper-darker);
  color: var(--ink-light);
  transition: all var(--transition-fast);
}

.card-link:hover {
  background: var(--accent);
  color: white;
  transform: scale(1.1);
}

.card-metrics {
  display: flex;
  gap: var(--space-sm);
  margin-top: auto;
}

.metric-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px 10px;
  background: var(--paper-darker);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--ink-light);
  font-weight: 500;
}

.card-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: var(--border-width) solid var(--border-color);
  background: var(--paper-dark);
}

.read-more {
  color: var(--accent);
  font-weight: 500;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.read-more:hover {
  color: var(--accent-dark);
  transform: translateX(2px);
}

/* Project Single Page Styles */
.project-showcase {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.project-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: var(--border-width) solid var(--border-color);
}

.project-badges {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.project-title {
  font-size: 3rem;
  margin: var(--space-md) 0;
  font-family: var(--font-display);
  line-height: 1.2;
}

.project-description {
  font-size: 1.25rem;
  color: var(--ink-light);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.project-meta {
  display: flex;
  gap: var(--space-xl);
  color: var(--ink-lighter);
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.project-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.project-resources {
  margin-bottom: var(--space-xxl);
}

.project-resources h2 {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  font-family: var(--font-display);
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--gap);
  margin-bottom: var(--space-lg);
}

.resource-section {
  background: var(--paper-dark);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  border: var(--border-width) solid var(--border-color);
}

.resource-section h3 {
  font-size: 1.25rem;
  margin: 0 0 var(--space-md) 0;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.resource-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.resource-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--paper);
  border-radius: var(--radius-md);
  color: var(--ink);
  text-decoration: none;
  transition: all var(--transition-fast);
  font-weight: 500;
}

.resource-link:hover {
  background: var(--accent);
  color: white;
  transform: translateX(4px);
}

.resource-link i {
  width: 20px;
  text-align: center;
}

.paper-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.paper-item {
  background: var(--paper);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: var(--border-width) solid var(--border-color);
}

.paper-item h4 {
  margin: 0 0 var(--space-xs) 0;
  font-size: 1.1rem;
  color: var(--ink);
}

.paper-venue {
  font-size: 0.9rem;
  color: var(--ink-lighter);
  font-style: italic;
  margin-bottom: var(--space-sm);
}

.paper-links {
  display: flex;
  gap: var(--space-md);
}

.paper-links a {
  color: var(--accent);
  font-weight: 500;
  font-size: 0.875rem;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.paper-links a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

.project-metrics {
  display: flex;
  gap: var(--space-xl);
  padding: var(--space-lg);
  background: var(--paper-darker);
  border-radius: var(--radius-lg);
  justify-content: center;
  margin-top: var(--space-lg);
}

.project-metrics .metric {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.project-metrics .metric i {
  font-size: 1.5rem;
  color: var(--accent);
}

.project-metrics .metric-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--ink);
}

.project-metrics .metric-label {
  font-size: 0.875rem;
  color: var(--ink-lighter);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-content {
  margin-bottom: var(--space-xxl);
}

.related-posts,
.related-projects {
  margin-top: var(--space-xxl);
  padding-top: var(--space-xl);
  border-top: var(--border-width) solid var(--border-color);
}

.related-posts h2,
.related-projects h2 {
  font-size: 1.75rem;
  margin-bottom: var(--space-lg);
  font-family: var(--font-display);
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.related-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  color: var(--accent);
  text-decoration: none;
  transition: all var(--transition-fast);
  font-weight: 500;
}

.related-item:hover {
  color: var(--accent-dark);
  transform: translateX(4px);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  /* Mobile menu */
  .mobile-menu-toggle {
    display: flex;
  }

  .nav-primary ul {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--paper);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    border-bottom: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-lg);
    z-index: 999;
  }

  .nav-primary ul.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-primary li {
    width: 100%;
  }

  .nav-primary a {
    display: block;
    padding: var(--space-sm) 0;
  }

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

  .portfolio-filters {
    flex-direction: column;
  }

  .project-title {
    font-size: 2rem;
  }

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

  .project-metrics {
    flex-direction: column;
    gap: var(--space-lg);
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .site-identity {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .social-links {
    justify-content: center;
  }

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

  .hero-stats {
    flex-direction: column;
    gap: var(--space-lg);
  }

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

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

  /* Single post layout - stack on mobile */
  .single-post-layout {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .post-sidebar {
    position: relative;
    top: 0;
    order: -1; /* TOC appears before content on mobile */
  }

  .content {
    font-size: 1rem;
  }

  .content > p:first-of-type::first-letter {
    font-size: 2.5em;
  }

  /* Reduce heading sizes on mobile */
  .post-header .post-title {
    font-size: 2rem;
  }

  .content h1 { font-size: 1.75rem; }
  .content h2 { font-size: 1.5rem; }
  .content h3 { font-size: 1.25rem; }
}

/* Tablet breakpoint */
@media (max-width: 1024px) and (min-width: 769px) {
  .single-post-layout {
    grid-template-columns: 200px 1fr;
    gap: var(--space-xl);
  }
}
/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  bottom: 80px;
  right: 30px;
  z-index: 1000;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-xl);
  background: var(--accent-light);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-toggle-icon {
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 768px) {
  .theme-toggle {
    bottom: 100px;
    right: 20px;
    width: 45px;
    height: 45px;
  }
}