/* Design System & Custom Properties for Naučna knjiga */
:root {
  --bg-dark: #F6F1E8;           /* Topla papir bela */
  --bg-surface: #ffffff;
  --bg-card: #D8DEE9;           /* Svetla plavo-siva za kartice */
  --bg-card-alt: #ffffff;
  --border-color: #cbd5e1;
  --text-main: #1F2933;         /* Grafitna za osnovni tekst */
  --text-muted: #5e6c7e;
  --text-light: #F6F1E8;        /* Za kontrast na tamnim pozadinama */
  
  --bg-header: #14213D;         /* Duboka plava za zaglavlje */
  --bg-footer: #14213D;         /* Duboka plava za podnožje */
  
  --accent-cyan: #8C1D2C;       /* Tamna bordo crvena za CTA i akcente */
  --accent-cyan-rgb: 140, 29, 44;
  --accent-gold: #B08D57;       /* Prigušeno zlatna za fine detalje i ikonice */
  --accent-gold-rgb: 176, 141, 87;
  --accent-green: #2B6CB0;      /* Sekundarni plavi akcenat */
  --accent-green-rgb: 43, 108, 176;
  
  --font-sans: 'Sora', system-ui, -apple-system, sans-serif;
  --font-serif: 'Lora', Georgia, serif;
  
  --shadow-premium: 0 10px 30px -10px rgba(20, 33, 61, 0.1);
  --shadow-card: 0 4px 20px -2px rgba(20, 33, 61, 0.05);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
}

/* Dark Theme Variables */
body.dark-theme {
  --bg-dark: #0f182c;           /* Duboka plava kao glavna pozadina */
  --bg-surface: #14213D;
  --bg-card: #1c2d52;
  --bg-card-alt: #162444;
  --border-color: #2a3c61;
  --text-main: #F6F1E8;         /* Papir bela za osnovni tekst */
  --text-muted: #94a3b8;
  --text-light: #F6F1E8;
  
  --bg-header: #0a1122;         /* Još tamnija plava za zaglavlje */
  --bg-footer: #0a1122;
  
  --accent-cyan: #ff4d62;       /* Svetlija bordo crvena za kontrast */
  --accent-gold: #e8c084;       /* Svetlija zlatna za kontrast */
  
  --shadow-premium: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.3);
}

/* Basic Reset & Setup */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  transition: var(--transition-smooth);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

/* Header & Navigation */
.site-header {
  background-color: var(--bg-header);
  border-bottom: 2px solid var(--accent-gold); /* Elegant gold line under header */
  padding: 1.25rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 20px rgba(20, 33, 61, 0.15);
}

/* Header Text, Logo & Nav Overrides for Dark Blue Background */
.site-header .logo-accent-cyan {
  color: var(--text-light); /* Warm paper white logo text */
  text-shadow: none;
}

.site-header .logo-accent-gold {
  color: var(--accent-gold); /* Gold logo text */
  text-shadow: none;
}

.site-header .logo-sub {
  color: #94a3b8; /* Light blue-gray sub-logo */
}

.site-header .nav-link {
  color: #cbd5e1; /* Light gray navigation links */
}

.site-header .nav-link:hover, .site-header .nav-link.active {
  color: var(--text-light);
}

.site-header .nav-link.active::after {
  background-color: var(--accent-gold); /* Gold active line */
  box-shadow: 0 0 8px rgba(var(--accent-gold-rgb), 0.5);
}

.site-header .header-search-input {
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-light);
}

.site-header .header-search-input::placeholder {
  color: #94a3b8;
  opacity: 0.8;
}

.site-header .header-search-input:focus {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: var(--accent-gold);
  box-shadow: 0 0 10px rgba(var(--accent-gold-rgb), 0.3);
}

.site-header .header-search-btn {
  color: #cbd5e1;
}

.site-header .header-search-btn:hover {
  color: var(--accent-gold);
}

.site-header .theme-toggle-btn {
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-light);
}

.site-header .theme-toggle-btn:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  background-color: rgba(255, 255, 255, 0.08);
}

.site-header .hamburger-bar {
  background-color: var(--text-light);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.header-left, .header-right {
  flex: 1;
  display: flex;
  align-items: center;
}

.header-right {
  justify-content: flex-end;
  gap: 1rem;
}

.site-logo {
  text-align: center;
  display: block;
}

.site-logo span {
  font-family: var(--font-sans);
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.logo-accent-cyan {
  color: var(--accent-cyan);
  text-shadow: 0 0 15px rgba(var(--accent-cyan-rgb), 0.3);
}

.logo-accent-gold {
  color: var(--accent-gold);
  text-shadow: 0 0 15px rgba(var(--accent-gold-rgb), 0.3);
}

.logo-sub {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--text-muted);
  margin-top: -0.1rem;
}

/* Search Bar */
.header-search-wrapper {
  position: relative;
  z-index: 100;
}

.header-search-form {
  position: relative;
  width: 260px;
  max-width: 100%;
}

.header-search-input {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.5rem 2.5rem 0.5rem 1rem;
  border-radius: 20px;
  color: var(--text-main);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  transition: var(--transition-smooth);
}

.header-search-input:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(var(--accent-cyan-rgb), 0.2);
}

.header-search-btn {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
}

.header-search-btn:hover {
  color: var(--accent-cyan);
}

.search-results-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  width: 320px;
  max-height: 380px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-premium);
  margin-top: 0.5rem;
  overflow-y: auto;
  display: none;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

.search-results-dropdown.active {
  display: block;
}

.search-result-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: block;
  transition: var(--transition-smooth);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background-color: var(--bg-card);
}

.search-result-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}

.search-result-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Nav Menu */
.site-nav {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.nav-link {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 0.25rem 0.5rem;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 8px rgba(var(--accent-cyan-rgb), 0.5);
}

/* Theme Toggle & Mobile Menu */
.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background-color: var(--bg-card);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 6px;
  width: 30px;
}

.hamburger-bar {
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  transition: var(--transition-smooth);
}

/* Hero Section */
.hero-section {
  padding: 4rem 0 2rem;
  text-align: center;
  position: relative;
}

.hero-title {
  font-family: var(--font-sans);
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  line-height: 1.1;
  color: var(--bg-header); /* Deep Blue on light, white/gold on dark */
}

body.dark-theme .hero-title {
  color: var(--text-light);
}

.hero-tagline {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent-gold); /* Muted Gold */
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-main);
  opacity: 0.95;
  max-width: 800px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

/* Layout Grids */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-header-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.section-header-link:hover {
  color: var(--text-main);
  text-decoration: underline;
}

/* Card Styles */
.article-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-cyan);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

.card-img-link {
  display: block;
  position: relative;
  overflow: hidden;
}

/* For Magazine: 16:9 */
.magazine-card-img-wrapper {
  aspect-ratio: 16 / 9;
  width: 100%;
  background-color: #0b111e;
}

/* For Scientist: 1:1 */
.scientist-card-img-wrapper {
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: 220px;
  margin: 1.5rem auto 0;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--border-color);
  transition: var(--transition-smooth);
}

.article-card:hover .scientist-card-img-wrapper {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(var(--accent-cyan-rgb), 0.4);
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.article-card:hover .card-img {
  transform: scale(1.05);
}

.card-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-category-badge {
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
  background-color: rgba(var(--accent-cyan-rgb), 0.1);
  color: var(--accent-cyan);
}

.card-content[style*="align-items: center"] .card-category-badge {
  align-self: center;
}

.card-category-badge.badge-biografije {
  background-color: rgba(var(--accent-gold-rgb), 0.1);
  color: var(--accent-gold);
}

.card-category-badge.badge-magazin {
  background-color: rgba(var(--accent-green-rgb), 0.1);
  color: var(--accent-green);
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
  margin-top: auto;
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Grid for scientist list on index */
.scientists-circle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.scientist-circle-card {
  text-align: center;
  transition: var(--transition-smooth);
}

.scientist-circle-card:hover {
  transform: translateY(-4px);
}

.circle-img-wrapper {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 1rem;
  border: 3px solid var(--border-color);
  transition: var(--transition-smooth);
}

.circle-img-wrapper.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #091325 0%, #1e355e 100%);
  color: var(--accent-gold);
}

.scientist-circle-card:hover .circle-img-wrapper {
  border-color: var(--accent-gold);
  box-shadow: 0 0 15px rgba(var(--accent-gold-rgb), 0.4);
}

.circle-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.circle-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.circle-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Article Detail Layout */
.article-page-container {
  padding-top: 2rem;
}

.breadcrumbs {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.article-detail {
  margin-bottom: 4rem;
}

.article-header-box {
  margin-bottom: 2rem;
  max-width: 800px;
}

.article-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-top: 0.75rem;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-meta-row span {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Cover Image Containers */
.article-cover-img-wrapper {
  width: 100%;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-premium);
  border: 1px solid var(--border-color);
  margin-bottom: 3rem;
}

.article-cover-img-wrapper.cover-16-9 {
  aspect-ratio: 16 / 9;
}

.article-cover-img-wrapper.cover-1-1 {
  aspect-ratio: 1 / 1;
  max-width: 800px;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  border-radius: 35px;
  border: 4px solid var(--border-color);
}

.article-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-grid-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
}

.article-content-body {
  min-width: 0;
}

.article-sidebar {
  position: relative;
}

.sidebar-sticky-card {
  position: sticky;
  top: 100px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

.sidebar-section-title {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.sidebar-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 1.5rem 0;
}

.quick-facts-list {
  list-style: none;
  font-size: 0.85rem;
}

.quick-facts-list li {
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
}

.quick-facts-list li strong {
  color: var(--text-muted);
}

/* Table of Contents */
.toc-list {
  list-style: none;
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toc-link {
  color: var(--text-muted);
  display: block;
}

.toc-link:hover {
  color: var(--accent-cyan);
  padding-left: 4px;
}

/* Tagging Wrapper */
.article-tags-wrapper {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 1rem 1.5rem;
  margin-bottom: 2rem;
}

.tags-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tags-group-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-right: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.taxonomy-tag-btn {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
}

.taxonomy-tag-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.taxonomy-tag-btn.field-tag:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.taxonomy-tag-btn.era-tag:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

/* Key Takeaways / Bullets */
.summary-bullets-box {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.05) 0%, rgba(245, 158, 11, 0.05) 100%);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--border-radius-md);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.summary-bullets-box h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.summary-bullets-box ul {
  padding-left: 1.25rem;
  font-size: 0.92rem;
  line-height: 1.6;
}

.summary-bullets-box li {
  margin-bottom: 0.5rem;
}

/* Markdown Content Elements */
.markdown-rendered-content {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-main);
}

.markdown-rendered-content p {
  margin-bottom: 1.5rem;
}

.markdown-rendered-content h2 {
  font-family: var(--font-sans);
  font-size: 1.6rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.markdown-rendered-content h3 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 2rem 0 1rem;
  color: var(--text-main);
}

.markdown-rendered-content ul, .markdown-rendered-content ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.markdown-rendered-content li {
  margin-bottom: 0.5rem;
}

.markdown-rendered-content blockquote {
  border-left: 4px solid var(--accent-gold);
  padding: 0.75rem 1.5rem;
  background-color: var(--bg-surface);
  border-radius: var(--border-radius-sm);
  font-style: italic;
  margin-bottom: 1.5rem;
  color: var(--text-muted);
}

.markdown-rendered-content strong {
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--text-main);
}

/* Tables in Content */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  text-align: left;
}

th, td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--bg-surface);
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

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

tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Cross-linking styles */
.reference-link {
  color: var(--accent-cyan);
  font-weight: 600;
  border-bottom: 1px dashed rgba(var(--accent-cyan-rgb), 0.4);
  transition: var(--transition-smooth);
}

.reference-link:hover {
  color: var(--text-main);
  border-bottom-color: var(--accent-cyan);
  background-color: rgba(var(--accent-cyan-rgb), 0.05);
}

/* Footnotes */
.footnote-ref a {
  color: var(--accent-cyan);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0 2px;
}

.footnotes-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 3rem 0 1.5rem;
  border: none;
}

.footnotes-section {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footnotes-section h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.footnotes-list {
  padding-left: 1.5rem;
}

.footnotes-list li {
  margin-bottom: 0.5rem;
}

.footnote-backlink {
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: bold;
}

/* Alert blocks in Markdown */
.alert-block {
  border-radius: var(--border-radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-sans);
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
}

.alert-title {
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.alert-block-note {
  border-left: 4px solid var(--accent-cyan);
  background-color: rgba(var(--accent-cyan-rgb), 0.03);
}
.alert-block-note .alert-title { color: var(--accent-cyan); }

.alert-block-important {
  border-left: 4px solid var(--accent-gold);
  background-color: rgba(var(--accent-gold-rgb), 0.03);
}
.alert-block-important .alert-title { color: var(--accent-gold); }

.alert-block-warning {
  border-left: 4px solid #ef4444;
  background-color: rgba(239, 68, 68, 0.03);
  border-color: rgba(239, 68, 68, 0.2);
}
.alert-block-warning .alert-title { color: #f87171; }

/* FAQ Section */
.article-faq-container {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 4rem 0;
  margin-top: 4rem;
}

.faq-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 3rem;
  letter-spacing: -0.02em;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background-color: var(--bg-card);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-question-btn {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-main);
  padding: 1.25rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  transition: var(--transition-smooth);
}

.faq-question-btn:hover {
  color: var(--accent-cyan);
}

.faq-question-btn i {
  transition: transform var(--transition-smooth);
  color: var(--text-muted);
}

.faq-item.active .faq-question-btn i {
  transform: rotate(180deg);
  color: var(--accent-cyan);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  padding: 0 1.5rem;
}

.faq-answer p {
  padding-bottom: 1.25rem;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* Related articles section */
.related-articles-section {
  padding: 4rem 0;
}

/* Taxonomy Cloud Pages */
.taxonomy-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
  margin-bottom: 4rem;
}

.tag-count {
  font-size: 0.8em;
  opacity: 0.7;
}

.alphabet-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
  margin-bottom: 2rem;
}

.filter-letter-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.75rem;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.filter-letter-btn:hover, .filter-letter-btn.active {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background-color: rgba(var(--accent-cyan-rgb), 0.05);
}

/* Footer style */
.site-footer {
  background-color: var(--bg-footer);
  border-top: 2px solid var(--accent-gold); /* Elegant gold line above footer */
  padding: 4rem 0 2rem;
  color: #cbd5e1; /* Light gray body text in footer */
  font-size: 0.88rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr; /* 4 columns for links and recommendations */
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-logo-col .site-logo {
  text-align: left;
  margin-bottom: 1rem;
}

.footer-logo-col .logo-accent-cyan {
  color: var(--text-light);
}

.footer-logo-col .logo-accent-gold {
  color: var(--accent-gold);
}

.footer-desc {
  line-height: 1.6;
  max-width: 400px;
  color: #cbd5e1;
}

.footer-title {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-light); /* White titles */
  margin-bottom: 1.25rem;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: #cbd5e1;
}

.footer-links a:hover {
  color: var(--accent-gold); /* Gold hover links */
  padding-left: 2px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  color: #94a3b8;
}

/* Cover Image Placeholders */
.article-cover-img-wrapper.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  text-align: center;
  padding: 3rem 1.5rem;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .article-grid-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    order: -1;
  }
  .sidebar-sticky-card {
    position: static;
  }
}

@media (max-width: 768px) {
  .header-left {
    display: none !important;
  }
  .theme-toggle-btn {
    display: none !important;
  }
  .header-inner {
    flex-wrap: nowrap;
    justify-content: space-between;
  }
  .mobile-menu-toggle {
    display: flex;
  }
  .site-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0.75rem;
    margin-top: 1.25rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
  }
  .site-nav.active {
    display: flex;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  
  /* Fix section headers on mobile */
  .section-header {
    flex-direction: column;
    align-items: flex-start !important;
    gap: 0.5rem;
  }
  .section-header h2 {
    font-size: 1.5rem;
  }
  .section-header-link {
    align-self: flex-start;
    margin-top: 0.25rem;
  }
  
  /* Breadcrumbs & Meta Row on mobile */
  .breadcrumbs span,
  .breadcrumbs i:last-of-type {
    display: none !important;
  }
  .article-meta-row {
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
  }
  .article-meta-row span {
    font-size: 0.8rem;
  }
  .article-meta-row span:not(:has(i)) {
    display: none !important;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* Archive Filtering and Sorting Controls */
.archive-controls {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.filter-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.alphabet-list {
  display: flex;
  flex-wrap: nowrap; /* Fit in a single row */
  gap: 0.2rem;
  overflow-x: auto;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE/Edge */
  padding: 4px 0;
  width: 100%;
}

.alphabet-list::-webkit-scrollbar {
  display: none; /* Chrome, Safari, Opera */
}

.filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  width: 1.8rem;
  height: 1.8rem;
  flex-shrink: 0; /* Keep size stable */
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.filter-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-1px);
}

.filter-btn.active {
  background: var(--accent-cyan);
  border-color: transparent;
  color: var(--text-light);
  box-shadow: 0 4px 12px rgba(var(--accent-cyan-rgb), 0.25);
}

.filter-btn[data-letter="all"] {
  width: auto;
  padding: 0 0.8rem;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.controls-row .filter-group {
  flex: 1;
  min-width: 240px;
}

.filter-select {
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  width: 100%;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.filter-select:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(0, 242, 254, 0.15);
}

.filter-select option {
  background: var(--bg-card);
  color: var(--text-main);
}

/* Quiz Option Buttons */
.quiz-option-btn {
  width: 100%;
  text-align: left;
  padding: 1.25rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quiz-option-btn:hover {
  background-color: var(--border-color) !important;
  border-color: var(--accent-cyan) !important;
  transform: translateY(-2px);
}

.quiz-option-btn:active {
  transform: translateY(0);
}