/**
 * NOTEBOOKS-DARK.CSS - Dark theme notebook styling for DiscoveringDaVinci.com
 * ===========================================================================
 * Matches foundation.css dark aesthetic while preserving manuscript feel
 * Used by all notebooks/*.html pages
 */

/* Override light-theme notebook variables for dark mode */
:root {
  --notebook-bg: var(--color-surface-elevated);
  --notebook-border: var(--color-border);
  --notebook-accent: var(--color-accent-primary);
  --notebook-accent-dim: var(--color-accent-tertiary);
  --notebook-text: var(--color-text-secondary);
  --notebook-heading: var(--color-text-primary);
}

/* ===== Notebook Page Layout ===== */
.notebook-page {
  background-color: var(--color-background);
  min-height: 100vh;
}

.notebook-nav {
  position: sticky;
  top: 0;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-xl);
  z-index: 10;
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.notebook-nav .nav-back {
  color: var(--color-accent-primary);
  text-decoration: none;
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.notebook-nav .nav-back:hover {
  color: var(--color-accent-secondary);
}

.notebook-nav .nav-breadcrumb {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
}

.notebook-nav .nav-breadcrumb a {
  color: var(--color-text-tertiary);
  text-decoration: none;
}

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

.notebook-nav .nav-breadcrumb .sep {
  margin: 0 0.4rem;
  opacity: 0.5;
}

/* ===== Main Content Area ===== */
.notebook-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-xl);
}

/* ===== Page Header ===== */
.notebook-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border-subtle);
}

.notebook-header h1 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}

.notebook-header .header-subtitle {
  font-family: var(--font-body);
  font-size: 1.25rem;
  color: var(--color-accent-primary);
  font-style: italic;
  margin-bottom: var(--space-lg);
}

.notebook-header .header-meta {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.notebook-header .header-meta .meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.notebook-header .header-meta .meta-label {
  font-weight: 600;
  color: var(--color-accent-tertiary);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
}

/* ===== Epigraph / Opening Quote ===== */
.notebook-epigraph {
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
  padding: var(--space-xl) var(--space-2xl);
  border-left: 3px solid var(--color-accent-primary);
  background-color: var(--color-surface);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.notebook-epigraph blockquote {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

.notebook-epigraph .attribution {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--color-accent-tertiary);
  margin-top: var(--space-md);
  font-style: normal;
}

/* ===== Codex Grid (for hub page) ===== */
.codex-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--space-xl);
  margin: var(--space-xl) 0;
}

.codex-card {
  position: relative;
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  transition: border-color var(--transition-medium), transform var(--transition-medium);
}

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

.codex-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: var(--space-sm);
}

.codex-card h3 a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.codex-card h3 a::after {
  content: '';
  position: absolute;
  inset: 0;
}

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

.codex-card .codex-meta {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-md);
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.codex-card .codex-meta .period {
  background-color: rgba(212, 175, 55, 0.15);
  color: var(--color-accent-primary);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  font-size: 0.8rem;
  font-weight: 500;
}

.codex-card .codex-meta .pages {
  color: var(--color-text-tertiary);
}

.codex-card .codex-desc {
  font-family: var(--font-body);
  font-size: 0.925rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.codex-card .codex-location {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-accent-tertiary);
  font-style: italic;
}

.codex-card .codex-status {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  margin-top: var(--space-sm);
  font-weight: 600;
}

.codex-card .codex-status.has-content {
  background-color: rgba(76, 175, 80, 0.15);
  color: #4caf50;
}

.codex-card .codex-status.coming-soon {
  background-color: rgba(212, 175, 55, 0.15);
  color: var(--color-accent-primary);
}

/* ===== Section Dividers ===== */
.section-divider {
  text-align: center;
  margin: var(--space-3xl) 0 var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border-subtle);
}

.section-divider h2 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.section-divider p {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
}

/* ===== Subject Grid (for topic navigation) ===== */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

.subject-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  transition: border-color var(--transition-medium);
}

.subject-card:hover {
  border-color: var(--color-accent-tertiary);
}

.subject-card h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--color-accent-primary);
  margin-bottom: var(--space-md);
}

.subject-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.subject-card li {
  margin: var(--space-sm) 0;
  padding-left: 1.2rem;
  position: relative;
  font-family: var(--font-ui);
  font-size: 0.85rem;
}

.subject-card li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent-tertiary);
}

.subject-card li a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.subject-card li a:hover {
  color: var(--color-accent-primary);
}

/* ===== Codex Detail Page ===== */
.codex-overview {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
  margin-bottom: var(--space-3xl);
}

.codex-description {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.codex-description h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--color-text-primary);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

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

.codex-sidebar {
  background-color: var(--color-surface-elevated);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-subtle);
  position: sticky;
  top: 80px;
}

.codex-sidebar dl {
  margin: 0;
}

.codex-sidebar dt {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: var(--space-md);
}

.codex-sidebar dt:first-child {
  margin-top: 0;
}

.codex-sidebar dd {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin: var(--space-xs) 0 var(--space-sm) 0;
  line-height: 1.5;
}

.codex-sidebar .external-link {
  display: inline-block;
  margin-top: var(--space-lg);
  padding: var(--space-sm) var(--space-md);
  background-color: rgba(212, 175, 55, 0.1);
  border: 1px solid var(--color-accent-primary);
  border-radius: var(--border-radius);
  color: var(--color-accent-primary);
  text-decoration: none;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.codex-sidebar .external-link:hover {
  background-color: rgba(212, 175, 55, 0.2);
}

/* ===== Manuscript Text Sections ===== */
.manuscript-section {
  margin: var(--space-2xl) 0;
  padding: var(--space-xl);
  background-color: var(--color-surface);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border-subtle);
}

.manuscript-section h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--color-accent-primary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border-subtle);
}

.passage {
  margin: var(--space-xl) 0;
  padding-left: var(--space-lg);
  border-left: 2px solid var(--color-border-subtle);
}

.passage:hover {
  border-left-color: var(--color-accent-primary);
}

.passage-number {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-xs);
}

.passage-text {
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.passage-text p {
  margin-bottom: var(--space-md);
}

.passage-source {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  margin-top: var(--space-sm);
  font-style: italic;
}

.footnote {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
  line-height: 1.5;
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-surface-elevated);
  border-radius: var(--border-radius);
}

/* ===== Commentary / Derek's Notes ===== */
.commentary {
  background-color: rgba(212, 175, 55, 0.05);
  border: 1px solid rgba(212, 175, 55, 0.2);
  border-radius: var(--border-radius);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) 0;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.commentary::before {
  content: '— D';
  display: block;
  font-weight: 600;
  color: var(--color-accent-primary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-sm);
}

/* ===== Stats Bar ===== */
.notebook-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  margin: var(--space-2xl) 0;
  padding: var(--space-xl);
  background-color: var(--color-surface);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border-subtle);
}

.notebook-stats .stat {
  text-align: center;
}

.notebook-stats .stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-accent-primary);
  font-weight: 700;
}

.notebook-stats .stat-label {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: var(--space-xs);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .codex-grid {
    grid-template-columns: 1fr;
  }
  
  .codex-overview {
    grid-template-columns: 1fr;
  }
  
  .codex-sidebar {
    position: static;
  }
  
  .subject-grid {
    grid-template-columns: 1fr;
  }
  
  .notebook-stats {
    flex-direction: column;
    gap: var(--space-lg);
  }

  .notebook-header h1 {
    font-size: 1.8rem;
  }
  
  .notebook-nav {
    flex-direction: column;
    gap: var(--space-sm);
  }
}