/**
 * Sunstone Base Layout Engine (Structural Mechanics)
 * Zero Inline Styles • Pure Semantic Classes & Data Attributes
 */

/* Box sizing and reset for presentation container */
.reveal, .reveal * {
  box-sizing: border-box;
}

.reveal .slides {
  text-align: left;
}

/* Slide Base Section: 16:9 full viewport scaling */
.reveal .slides section.slide {
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  width: 100% !important;
  height: 100% !important;
  padding: 1.6rem 2.4rem 1.2rem 2.4rem !important;
  overflow: hidden !important;
  display: flex !important;
  flex-direction: column !important;
  justify-content: space-between !important;
  background-color: var(--sunstone-bg, var(--bg-color, #0f172a));
  color: var(--sunstone-text-secondary, var(--text-color, #cbd5e1));
}

.reveal:not(.overview) .slides section.slide:not(.present) {
  display: none !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

.reveal:not(.overview) .slides section.slide.present {
  display: flex !important;
  opacity: 1 !important;
  z-index: 10;
}

.reveal.overview .slides section.slide {
  display: flex !important;
  opacity: 1 !important;
  pointer-events: auto !important;
  cursor: pointer !important;
}

/* Master Slide Container */
.slide-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  position: relative;
  z-index: 2;
}

/* Slide Header */
.slide-header {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
}

.slide-header[data-align="split"] {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.slide-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* Upper-Right Corner Palette Badge (Base) */
.palette-corner-badge {
  position: absolute;
  top: 1.1rem;
  right: 2.2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 9999px;
  z-index: 50;
  user-select: none;
  background: var(--sunstone-surface, rgba(30, 41, 59, 0.9));
  color: var(--sunstone-text-primary, #f8fafc);
  border: 1px solid var(--sunstone-border, #334155);
}

.palette-corner-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sunstone-accent, #38bdf8);
  display: inline-block;
  box-shadow: 0 0 6px var(--sunstone-accent, #38bdf8);
}

.reveal:not(.overview) .slides section.slide:not(.present) .palette-corner-badge {
  display: none !important;
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
}

.slide-title {
  margin: 0 !important;
  padding: 0 !important;
  font-size: 1.9rem !important;
  font-weight: 700 !important;
  line-height: 1.15 !important;
}

.slide-subtitle {
  margin: 0 !important;
  padding: 0 !important;
  font-size: 1.05rem !important;
  font-weight: 400 !important;
  opacity: 0.85;
  line-height: 1.35 !important;
}

/* Slide Body */
.slide-body {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 2;
}

/* Slide Footer */
.slide-footer {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  user-select: none;
}

/* Window Chrome (Code & Terminal) via Pseudo-elements */
.code-window, .terminal-window {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  border-radius: var(--sunstone-radius-md, 8px);
}

.window-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 0.8rem;
  font-size: 0.75rem;
  font-weight: 600;
  user-select: none;
  position: relative;
}

/* Ensure no pseudo-element generates duplicate window dots */
.window-header::before {
  content: none !important;
  display: none !important;
}

/* Semantic Window Header Dots */
.terminal-dots {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  flex-shrink: 0;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.terminal-dot.red { background-color: #ff5f56; }
.terminal-dot.yellow { background-color: #ffbd2e; }
.terminal-dot.green { background-color: #27c93f; }

.window-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.window-controls {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.window-btn {
  display: none;
}

.lang-tag {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.window-body, .code-window pre {
  flex: 1 1 auto;
  margin: 0 !important;
  padding: 0.75rem 1rem !important;
  overflow: auto !important;
}

.code-window pre code {
  padding: 0 !important;
  background: transparent !important;
  font-family: var(--sunstone-font-mono, monospace) !important;
  font-size: 0.85rem !important;
  line-height: 1.4 !important;
}

/* Density overrides via data-density */
[data-density="compact"] pre code {
  font-size: 0.75rem !important;
  line-height: 1.25 !important;
}

[data-density="dense"] pre code {
  font-size: 0.68rem !important;
  line-height: 1.2 !important;
}

/* Cards & Lists */
.card {
  display: flex;
  flex-direction: column;
  padding: 0.9rem 1.1rem;
  border-radius: var(--sunstone-radius-md, 8px);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
}

.card-list {
  margin: 0 !important;
  padding: 0 0 0 1.2rem !important;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.88rem;
  line-height: 1.4;
}

/* Two-Column Layout Grid Ratios */
.slide-body[data-layout*="two-column"],
[data-layout*="two-column"] .slide-body {
  display: grid !important;
  gap: 1.2rem;
  align-items: stretch;
  flex: 1;
  min-height: 0;
}

.slide-body[data-layout*="two-column"][data-ratio="1:1"],
[data-layout*="two-column"][data-ratio="1:1"] .slide-body,
[data-layout*="two-column"] .slide-body[data-ratio="1:1"] {
  grid-template-columns: 1fr 1fr !important;
}

.slide-body[data-layout*="two-column"][data-ratio="3:2"],
[data-layout*="two-column"][data-ratio="3:2"] .slide-body,
[data-layout*="two-column"] .slide-body[data-ratio="3:2"] {
  grid-template-columns: 3fr 2fr !important;
}

.slide-body[data-layout*="two-column"][data-ratio="2:3"],
[data-layout*="two-column"][data-ratio="2:3"] .slide-body,
[data-layout*="two-column"] .slide-body[data-ratio="2:3"] {
  grid-template-columns: 2fr 3fr !important;
}

.slide-body[data-layout*="two-column"][data-ratio="2:1"],
[data-layout*="two-column"][data-ratio="2:1"] .slide-body,
[data-layout*="two-column"] .slide-body[data-ratio="2:1"] {
  grid-template-columns: 2fr 1fr !important;
}

.slide-body[data-layout*="two-column"][data-ratio="1:2"],
[data-layout*="two-column"][data-ratio="1:2"] .slide-body,
[data-layout*="two-column"] .slide-body[data-ratio="1:2"] {
  grid-template-columns: 1fr 2fr !important;
}

.column, .col {
  display: flex !important;
  flex-direction: column !important;
  gap: 0.8rem;
  min-height: 0;
  min-width: 0;
  flex: 1;
}

/* Three-Column & Four-Column Layouts */
.slide-body[data-layout*="three-column"],
[data-layout*="three-column"] .slide-body {
  display: grid !important;
  grid-template-columns: repeat(3, 1fr) !important;
  gap: 1rem;
  align-items: stretch;
  flex: 1;
  min-height: 0;
}

.slide-body[data-layout*="four-column"],
[data-layout*="four-column"] .slide-body {
  display: grid !important;
  grid-template-columns: repeat(4, 1fr) !important;
  gap: 0.8rem;
  align-items: stretch;
  flex: 1;
  min-height: 0;
}

/* Code Comparison Layout */
.slide-body[data-layout*="code-comparison"],
[data-layout*="code-comparison"] .slide-body {
  display: grid !important;
  grid-template-columns: 1fr 1fr !important;
  gap: 1rem;
  align-items: stretch;
  flex: 1;
  min-height: 0;
}

.comparison-pane {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  min-height: 0;
}

.critique-overlay {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.8rem;
  border-radius: var(--sunstone-radius-sm, 6px);
}

.takeaway-banner {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.6rem 1rem;
  border-radius: var(--sunstone-radius-sm, 6px);
  font-size: 0.88rem;
}

/* Matrix Layout */
[data-layout="matrix"] .matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

[data-layout="matrix"] .matrix-table th,
[data-layout="matrix"] .matrix-table td {
  padding: 0.6rem 0.9rem;
}

/* Timeline Layout (Rail & Dots via CSS Pseudo-elements) */
[data-layout="timeline"] .timeline-track {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  margin: 1.5rem 2rem 2rem 2rem;
}

/* Horizontal connecting rail */
[data-layout="timeline"] .timeline-track::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--sunstone-border, #334155);
  z-index: 1;
}

.timeline-step {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

/* Milestone Dot */
.timeline-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--sunstone-accent, #38bdf8);
  border: 3px solid var(--sunstone-bg, #0f172a);
}

.timeline-cards {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 0.8rem;
}

/* Architecture Layout */
.arch-stack {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  height: 100%;
  justify-content: center;
}

.arch-tier {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 1rem;
  border-radius: var(--sunstone-radius-sm, 6px);
}

/* Flow arrow between tiers rendered via CSS */
.arch-tier + .arch-tier {
  margin-top: 0.6rem;
  position: relative;
}

.arch-tier + .arch-tier::before {
  content: "▼";
  position: absolute;
  top: -0.75rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  color: var(--sunstone-accent, #38bdf8);
}

.arch-tier-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
  font-size: 0.85rem;
  font-weight: 700;
}

.arch-grid {
  display: grid;
  gap: 0.6rem;
}

[data-cols="1"] { grid-template-columns: 1fr; }
[data-cols="2"] { grid-template-columns: repeat(2, 1fr); }
[data-cols="3"] { grid-template-columns: repeat(3, 1fr); }
[data-cols="4"] { grid-template-columns: repeat(4, 1fr); }
[data-cols="5"] { grid-template-columns: repeat(5, 1fr); }
[data-cols="6"] { grid-template-columns: repeat(6, 1fr); }

.arch-block {
  padding: 0.45rem 0.6rem;
  border-radius: 4px;
}

.arch-block-title {
  font-size: 0.82rem;
  font-weight: 700;
}

.arch-block-desc {
  font-size: 0.72rem;
  opacity: 0.85;
}

/* Chapter Layout (Section Transitions) */
.chapter-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  height: 100%;
  gap: 1.5rem;
}

.chapter-pillars-row {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Intro / Hero Slide Universal Architecture */
.intro-content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  text-align: center;
  height: 100%;
  box-sizing: border-box;
  padding: 2.5rem 2rem 1.8rem;
  position: relative;
  z-index: 2;
}

.intro-top-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  max-width: 1000px;
}

.intro-topic-wrap {
  margin-bottom: 0.2rem;
}

.intro-topic-badge {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 0.35rem 1.25rem;
  border-radius: 9999px;
  text-transform: uppercase;
}

.intro-title {
  font-size: clamp(2.8rem, 5.2vw, 4.2rem) !important;
  font-weight: 800 !important;
  line-height: 1.15 !important;
  letter-spacing: -0.025em;
  margin: 0 !important;
}

.intro-subtitle {
  font-size: clamp(1.2rem, 2.2vw, 1.6rem) !important;
  font-weight: 400 !important;
  line-height: 1.45 !important;
  opacity: 0.85;
  max-width: 850px;
  margin: 0 !important;
}

.intro-middle-block {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto 0;
  width: 100%;
}

.intro-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  max-width: 900px;
}

.intro-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: 9999px;
  font-size: 0.95rem;
  font-weight: 600;
  background: var(--sunstone-surface, rgba(255, 255, 255, 0.05));
  border: 1px solid var(--sunstone-border, rgba(255, 255, 255, 0.15));
  color: var(--sunstone-text-primary, #ffffff);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.intro-pill:hover {
  transform: translateY(-2px);
  border-color: var(--sunstone-accent, #38bdf8);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
}

.intro-bottom-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--sunstone-border, rgba(255, 255, 255, 0.1));
  width: 100%;
  max-width: 520px;
}

.intro-author-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
}

.intro-author-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.intro-author-role {
  font-size: 0.9rem;
  opacity: 0.75;
  font-weight: 500;
}

/* Quote Layout */
.quote-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  height: 100%;
  padding: 2rem 4rem;
}

.quote-text {
  font-size: 2rem;
  font-style: italic;
  line-height: 1.35;
  margin-bottom: 1.5rem;
  position: relative;
}

.quote-author {
  font-size: 1.1rem;
  font-weight: 700;
}

.quote-role {
  font-size: 0.9rem;
  opacity: 0.8;
}

/* SVG Icon alignment */
.fa-icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
  fill: currentColor;
}

/* ==========================================================================
   Comprehensive Spatial Layout Engine (CSS Grid & Flexbox Foundation)
   ========================================================================== */

/* Universal Layout Body: Strict flex column taking remaining vertical space */
.slide-body {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  width: 100%;
  box-sizing: border-box;
}

/* 1. Profile / Speaker Layout */
.slide-body[data-layout*="profile"],
[data-layout*="profile"] .slide-body {
  display: flex !important;
  flex-direction: column !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
}

.profile-stats-ribbon {
  display: grid !important;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)) !important;
  gap: 0.75rem;
  width: 100%;
  flex-shrink: 0;
  box-sizing: border-box;
}

.profile-stat-chip {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--sunstone-radius-sm, 6px);
  background: var(--sunstone-surface, #1e293b);
  border: 1px solid var(--sunstone-border, #334155);
  box-shadow: var(--sunstone-shadow, 0 2px 4px rgba(0,0,0,0.1));
  box-sizing: border-box;
  min-width: 0;
}

.profile-stat-chip .stat-icon {
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.profile-stat-chip .stat-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 0.1rem;
}

.profile-stat-chip .stat-value {
  font-size: 0.92rem;
  font-weight: 800;
  line-height: 1.15;
  white-space: nowrap;
}

.profile-stat-chip .stat-label {
  font-size: 0.68rem;
  opacity: 0.8;
  line-height: 1.15;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.profile-bento-grid {
  display: grid !important;
  grid-template-columns: repeat(2, 1fr) !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
  width: 100%;
  box-sizing: border-box;
}

.profile-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.85rem 1.1rem;
  border-radius: var(--sunstone-radius-md, 8px);
  min-height: 0;
  box-sizing: border-box;
}

/* 2. Dual Mode / Comparison Layout */
.slide-body[data-layout*="dual-mode"],
[data-layout*="dual-mode"] .slide-body {
  display: flex !important;
  flex-direction: column !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
}

.dual-mode-banner {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.45rem 0.95rem;
  border-radius: var(--sunstone-radius-sm, 6px);
  background: var(--sunstone-surface, #1e293b);
  border: 1px solid var(--sunstone-border, #334155);
  font-size: 0.85rem;
  flex-shrink: 0;
}

.dual-mode-grid {
  display: grid !important;
  grid-template-columns: 1fr 1fr !important;
  gap: 1rem;
  flex: 1;
  min-height: 0;
  align-items: stretch;
}

.dual-mode-card {
  display: flex;
  flex-direction: column;
  padding: 0.85rem 1.1rem;
  gap: 0.55rem;
  border-radius: var(--sunstone-radius-md, 8px);
  min-height: 0;
  box-sizing: border-box;
}

.dual-mode-flow code {
  font-family: var(--sunstone-font-mono, monospace);
  font-size: 0.78rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.dual-mode-specs {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.dual-mode-spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  padding: 0.25rem 0;
  border-bottom: 1px dashed var(--sunstone-border, #334155);
}

.dual-mode-summary {
  padding: 0.5rem 0.95rem;
  border-radius: var(--sunstone-radius-sm, 6px);
  font-size: 0.82rem;
  flex-shrink: 0;
}

/* 3. Demo Roadmap Layout */
.slide-body[data-layout*="demo-roadmap"],
[data-layout*="demo-roadmap"] .slide-body {
  display: flex !important;
  flex-direction: column !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
}

.demo-steps-grid {
  display: grid !important;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)) !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
  align-items: stretch;
}

.demo-steps-grid[data-cols="2"] { grid-template-columns: repeat(2, 1fr) !important; }
.demo-steps-grid[data-cols="3"] { grid-template-columns: repeat(3, 1fr) !important; }
.demo-steps-grid[data-cols="4"] { grid-template-columns: repeat(4, 1fr) !important; }

.demo-step-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.85rem 1rem;
  border-radius: var(--sunstone-radius-md, 8px);
  min-height: 0;
  box-sizing: border-box;
}

.demo-step-highlight {
  font-size: 0.78rem;
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
  margin-top: auto;
}

.demo-roadmap-summary {
  padding: 0.5rem 0.95rem;
  border-radius: var(--sunstone-radius-sm, 6px);
  font-size: 0.82rem;
  flex-shrink: 0;
}

/* 4. Closing Layout */
.slide-body[data-layout*="closing"],
[data-layout*="closing"] .slide-body {
  display: flex !important;
  flex-direction: column !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
}

.closing-cards-grid {
  display: grid !important;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)) !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
  align-items: stretch;
}

.closing-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 0.85rem 1.1rem;
  border-radius: var(--sunstone-radius-md, 8px);
  min-height: 0;
  box-sizing: border-box;
}

.closing-link {
  font-size: 0.82rem;
}

.closing-desc {
  font-size: 0.8rem;
  opacity: 0.85;
}

.closing-quickstart-bar {
  flex-shrink: 0;
  max-height: 120px;
}

.closing-signature {
  text-align: center;
  font-size: 0.85rem;
  font-style: italic;
  opacity: 0.8;
  flex-shrink: 0;
}

/* 5. Key Metrics / Stats Dashboard Layout (NEW) */
.slide-body[data-layout*="stats"],
[data-layout*="stats"] .slide-body {
  display: flex !important;
  flex-direction: column !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
}

.stats-grid {
  display: grid !important;
  gap: 1rem;
  flex: 1;
  min-height: 0;
  align-items: stretch;
}

.stats-grid[data-cols="2"] { grid-template-columns: repeat(2, 1fr) !important; }
.stats-grid[data-cols="3"] { grid-template-columns: repeat(3, 1fr) !important; }
.stats-grid[data-cols="4"] { grid-template-columns: repeat(4, 1fr) !important; }

.stat-kpi-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.1rem 1.3rem;
  border-radius: var(--sunstone-radius-md, 8px);
  background: var(--sunstone-surface, #1e293b);
  border: 1px solid var(--sunstone-border, #334155);
  box-shadow: var(--sunstone-shadow, 0 4px 6px rgba(0,0,0,0.1));
  box-sizing: border-box;
  min-height: 0;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.stat-kpi-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.stat-kpi-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.18rem 0.55rem;
  border-radius: 9999px;
  text-transform: uppercase;
}

.stat-kpi-value {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  margin: 0.2rem 0 0.5rem 0;
  letter-spacing: -0.03em;
}

.stat-kpi-label {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.35rem;
}

.stat-kpi-desc {
  font-size: 0.8rem;
  opacity: 0.8;
  line-height: 1.35;
}

.stat-kpi-chart {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0.5rem 0;
  width: 100%;
  min-height: 48px;
}

.stat-kpi-chart svg {
  max-width: 100%;
  height: auto;
  overflow: visible;
}

/* Celestine SVG Chart Card (Universal) */
.chart-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  box-sizing: border-box;
}

.chart-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  min-height: 0;
}

.chart-container svg {
  max-width: 100%;
  max-height: 100%;
  height: auto;
  overflow: visible;
}

/* 6. Asymmetrical Feature Bento Grid Layout (NEW) */
.slide .slide-body[data-layout*="feature-grid"],
.slide[data-layout*="feature-grid"] .slide-body,
.slide-body[data-layout*="feature-grid"],
[data-layout*="feature-grid"] .slide-body {
  display: grid !important;
  grid-template-columns: 1.25fr 1fr !important;
  gap: 1.2rem;
  flex: 1;
  min-height: 0;
  align-items: stretch;
}

.bento-hero-column {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.bento-side-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 0;
}

.bento-hero-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.1rem 1.3rem;
  border-radius: var(--sunstone-radius-md, 8px);
  min-height: 0;
  box-sizing: border-box;
}

.bento-code-window {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  margin: 0.5rem 0;
  border-radius: var(--sunstone-radius-sm, 4px);
  background: var(--sunstone-code-bg);
  border: 1px solid var(--sunstone-border);
}

.bento-code-window pre {
  margin: 0;
  padding: 0.75rem 1rem;
  height: 100%;
  overflow: auto;
  box-sizing: border-box;
}

.bento-desc {
  margin-top: 0.45rem;
  font-size: 0.85rem;
  line-height: 1.4;
  opacity: 0.9;
  flex-shrink: 0;
}

.bento-subcard {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 0.95rem 1.15rem;
  border-radius: var(--sunstone-radius-md, 8px);
  min-height: 0;
  box-sizing: border-box;
}

/* 7. Process Flow / Pipeline Layout (NEW) */
.slide-body[data-layout*="process-flow"],
[data-layout*="process-flow"] .slide-body {
  display: flex !important;
  flex-direction: column !important;
  gap: 1rem;
  flex: 1;
  min-height: 0;
  justify-content: center;
}

.process-pipeline {
  display: grid !important;
  gap: 0.9rem;
  width: 100%;
  align-items: stretch;
  flex: 1;
  min-height: 0;
}

.process-pipeline[data-steps="3"] { grid-template-columns: repeat(3, 1fr) !important; }
.process-pipeline[data-steps="4"] { grid-template-columns: repeat(4, 1fr) !important; }
.process-pipeline[data-steps="5"] { grid-template-columns: repeat(5, 1fr) !important; }

.process-step-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1rem 1.15rem;
  border-radius: var(--sunstone-radius-md, 8px);
  position: relative;
  min-height: 0;
  box-sizing: border-box;
}

.process-step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-weight: 800;
  font-size: 0.82rem;
  margin-bottom: 0.2rem;
}

.process-step-title {
  font-size: 1.05rem;
  font-weight: 700;
}

.process-step-desc {
  font-size: 0.82rem;
  opacity: 0.85;
  line-height: 1.35;
}

/* 8. Comparison / Benchmark Data Table Layout (NEW) */
.slide-body[data-layout*="table"],
[data-layout*="table"] .slide-body {
  display: flex !important;
  flex-direction: column !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
}

.data-table-container {
  flex: 1;
  overflow: auto;
  border-radius: var(--sunstone-radius-md, 8px);
  border: 1px solid var(--sunstone-border, #334155);
  background: var(--sunstone-surface, #1e293b);
  box-shadow: var(--sunstone-shadow, 0 4px 6px rgba(0,0,0,0.1));
}

.sunstone-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.sunstone-table th {
  padding: 0.75rem 1rem;
  font-weight: 700;
  border-bottom: 2px solid var(--sunstone-border, #334155);
  background: var(--sunstone-code-bg, #090d16);
  position: sticky;
  top: 0;
  z-index: 2;
}

.sunstone-table td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--sunstone-border, #334155);
}

.sunstone-table tr.highlight-row {
  background: rgba(56, 189, 248, 0.12);
  font-weight: 700;
}

.table-footnote {
  font-size: 0.75rem;
  font-style: italic;
  opacity: 0.75;
  margin-top: 0.25rem;
}

/* 9. Q&A / FAQ Grid Layout (NEW) */
.slide-body[data-layout*="faq"],
[data-layout*="faq"] .slide-body {
  display: flex !important;
  flex-direction: column !important;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
}

.faq-grid {
  display: grid !important;
  grid-template-columns: 1fr 1fr !important;
  gap: 0.95rem;
  flex: 1;
  min-height: 0;
  align-items: stretch;
}

.faq-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.95rem 1.15rem;
  border-radius: var(--sunstone-radius-md, 8px);
  min-height: 0;
  box-sizing: border-box;
}

.faq-question {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.25;
}

.faq-q-badge {
  font-size: 0.68rem;
  font-weight: 800;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  flex-shrink: 0;
}

.faq-answer {
  font-size: 0.82rem;
  opacity: 0.88;
  line-height: 1.4;
}




/**
 * Sunstone Academic Theme (LaTeX / Computer Modern / Research Papers)
 * Elegant serif typography, delicate hairline rules, scholarly contrast.
 */

:root {
  /* Typography - Classical Academic Serif Stack with System Fallbacks */
  --sunstone-font-sans: 'Latin Modern Roman', 'Computer Modern Serif', 'Cambria', 'Georgia', 'Times New Roman', serif;
  --sunstone-font-mono: 'Latin Modern Mono', 'Computer Modern Typewriter', 'Courier New', Consolas, monospace;

  /* Geometry & Radii - Minimal formal curves */
  --sunstone-radius-sm: 2px;
  --sunstone-radius-md: 4px;
  --sunstone-radius-lg: 6px;
  --sunstone-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);

  /* Default Palette: Computer Modern */
  --sunstone-bg: #faf9f5;
  --sunstone-surface: #ffffff;
  --sunstone-surface-hover: #f2eee3;
  --sunstone-text-primary: #1f2937;
  --sunstone-text-secondary: #374151;
  --sunstone-text-muted: #6b7280;
  --sunstone-accent: #1e3a8a;
  --sunstone-accent-secondary: #047857;
  --sunstone-accent-tertiary: #b45309;
  --sunstone-border: #e5e2d9;
  --sunstone-border-active: #1e3a8a;
  --sunstone-code-bg: #f3f0e6;
}

/* Base Reveal Typography */
.reveal {
  font-family: var(--sunstone-font-sans);
  color: var(--sunstone-text-secondary);
  background-color: var(--sunstone-bg);
  line-height: 1.6;
}

.reveal .slides section.slide,
.slide {
  background-color: var(--sunstone-bg) !important;
  color: var(--sunstone-text-secondary) !important;
  font-family: var(--sunstone-font-sans) !important;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.palette-corner-badge {
  background: var(--sunstone-surface);
  color: var(--sunstone-text-primary);
  border: 1px solid var(--sunstone-border);
  font-family: var(--sunstone-font-sans);
  font-variant: small-caps;
  border-radius: 4px;
}

.palette-corner-dot {
  background: var(--sunstone-accent);
}

.code-window .window-header .terminal-dots,
.code-window .window-header .window-btn {
  display: none;
}

.slide-title {
  font-family: var(--sunstone-font-sans);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.slide-subtitle {
  font-style: italic;
}

/* Scholarly Cards & Theorems */
.card {
  background: var(--sunstone-surface);
  border: 1px solid var(--sunstone-border);
  border-left: 4px solid var(--sunstone-accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* Publication Hairline Code Windows */
.code-window {
  border: 1px solid var(--sunstone-border);
  background: var(--sunstone-code-bg);
}

.code-window .window-header {
  background: var(--sunstone-surface);
  border-bottom: 1px solid var(--sunstone-border);
  font-family: var(--sunstone-font-mono);
  font-size: 0.72rem;
}

/* Classical Formal Badges */
.badge {
  border-radius: 3px;
  font-family: var(--sunstone-font-sans);
  font-variant: small-caps;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.15rem 0.5rem;
}

/* Academic Blockquote */
.quote-text {
  font-style: italic;
  font-family: var(--sunstone-font-sans);
}

/* Academic Stat Counters & Tables */
.stat-kpi-card {
  background: var(--sunstone-surface);
  border: 1px solid var(--sunstone-border);
  border-left: 4px solid var(--sunstone-accent);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.stat-kpi-value {
  font-family: var(--sunstone-font-sans);
  font-weight: 700;
  color: var(--sunstone-accent);
  letter-spacing: -0.02em;
}

.stat-kpi-label {
  font-family: var(--sunstone-font-sans);
  font-variant: small-caps;
  letter-spacing: 0.06em;
  font-size: 0.85rem;
}

/* Classical LaTeX Booktabs Tables */
.sunstone-table {
  border-top: 2px solid var(--sunstone-text-primary);
  border-bottom: 2px solid var(--sunstone-text-primary);
  border-collapse: collapse;
}

.sunstone-table thead tr {
  border-bottom: 1px solid var(--sunstone-text-primary);
}

.sunstone-table th {
  font-family: var(--sunstone-font-sans);
  font-variant: small-caps;
  letter-spacing: 0.06em;
  font-weight: 700;
  padding: 0.6rem 1rem;
  background: transparent;
  color: var(--sunstone-text-primary);
}

.sunstone-table td {
  border: none;
  border-bottom: 1px solid var(--sunstone-border);
  padding: 0.55rem 1rem;
}

.sunstone-table tr.highlighted-row {
  background-color: var(--sunstone-surface-hover);
  font-weight: 600;
}

/* Scholarly Feature Grid & Bento Cards */
.feature-grid-main {
  background: var(--sunstone-surface);
  border: 1px solid var(--sunstone-border);
  border-top: 3px solid var(--sunstone-accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.feature-grid-side {
  background: var(--sunstone-surface);
  border: 1px solid var(--sunstone-border);
}

/* Formal Step Pipeline */
.process-step {
  background: var(--sunstone-surface);
  border: 1px solid var(--sunstone-border);
  border-radius: 2px;
}

.process-step-num {
  font-family: var(--sunstone-font-sans);
  font-variant: small-caps;
  font-weight: 700;
  color: var(--sunstone-accent);
}

/* Scholarly Inquiry FAQ Cards */
.faq-card {
  background: var(--sunstone-surface);
  border: 1px solid var(--sunstone-border);
  border-left: 3px solid var(--sunstone-accent);
  border-radius: 2px;
}

.faq-q {
  font-family: var(--sunstone-font-sans);
  font-weight: 700;
  font-style: italic;
}


/* Theme-Scoped Palette CSS Rules */
.slide[data-palette="computer_modern"], .solvin-slide.computer_modern, [data-palette="computer_modern"] {
  /* Sol.vin Theme Variables */
  --bg-color: #faf9f5;
  --bg-window: #ffffff;
  --text-color: #1f2937;
  --text-dim: #6b7280;
  --link-color: #1e3a8a;
  --border-color: #e5e2d9;
  --border-active: #1e3a8a;
  --accent-color: #1e3a8a;
  --accent-secondary: #047857;
  --accent-tertiary: #b45309;
  --accent-quaternary: #6b7280;
  --shadow-color: #000000;
  --cube: #1f2937;
  --cube-hover: #1e3a8a;
  --emoji-filter: url(#emoji-filter-computer_modern);

  /* Sunstone Modern Variables */
  --sunstone-bg: #faf9f5;
  --sunstone-surface: #ffffff;
  --sunstone-surface-hover: #f2eee3;
  --sunstone-text-primary: #1f2937;
  --sunstone-text-secondary: #374151;
  --sunstone-text-muted: #6b7280;
  --sunstone-accent: #1e3a8a;
  --sunstone-accent-secondary: #047857;
  --sunstone-accent-tertiary: #b45309;
  --sunstone-border: #e5e2d9;
  --sunstone-border-active: #1e3a8a;
  --sunstone-code-bg: #f3f0e6;
}
.slide[data-palette="cambridge_blue"], .solvin-slide.cambridge_blue, [data-palette="cambridge_blue"] {
  /* Sol.vin Theme Variables */
  --bg-color: #f8fafc;
  --bg-window: #ffffff;
  --text-color: #0f172a;
  --text-dim: #64748b;
  --link-color: #0369a1;
  --border-color: #cbd5e1;
  --border-active: #0369a1;
  --accent-color: #0369a1;
  --accent-secondary: #0d9488;
  --accent-tertiary: #4338ca;
  --accent-quaternary: #64748b;
  --shadow-color: #000000;
  --cube: #0f172a;
  --cube-hover: #0369a1;
  --emoji-filter: url(#emoji-filter-cambridge_blue);

  /* Sunstone Modern Variables */
  --sunstone-bg: #f8fafc;
  --sunstone-surface: #ffffff;
  --sunstone-surface-hover: #f1f5f9;
  --sunstone-text-primary: #0f172a;
  --sunstone-text-secondary: #334155;
  --sunstone-text-muted: #64748b;
  --sunstone-accent: #0369a1;
  --sunstone-accent-secondary: #0d9488;
  --sunstone-accent-tertiary: #4338ca;
  --sunstone-border: #cbd5e1;
  --sunstone-border-active: #0369a1;
  --sunstone-code-bg: #f1f5f9;
}
.slide[data-palette="oxford_crimson"], .solvin-slide.oxford_crimson, [data-palette="oxford_crimson"] {
  /* Sol.vin Theme Variables */
  --bg-color: #fdfbf7;
  --bg-window: #ffffff;
  --text-color: #262626;
  --text-dim: #737373;
  --link-color: #881337;
  --border-color: #e7dfd5;
  --border-active: #881337;
  --accent-color: #881337;
  --accent-secondary: #9a3412;
  --accent-tertiary: #15803d;
  --accent-quaternary: #737373;
  --shadow-color: #000000;
  --cube: #262626;
  --cube-hover: #881337;
  --emoji-filter: url(#emoji-filter-oxford_crimson);

  /* Sunstone Modern Variables */
  --sunstone-bg: #fdfbf7;
  --sunstone-surface: #ffffff;
  --sunstone-surface-hover: #f7f2ea;
  --sunstone-text-primary: #262626;
  --sunstone-text-secondary: #404040;
  --sunstone-text-muted: #737373;
  --sunstone-accent: #881337;
  --sunstone-accent-secondary: #9a3412;
  --sunstone-accent-tertiary: #15803d;
  --sunstone-border: #e7dfd5;
  --sunstone-border-active: #881337;
  --sunstone-code-bg: #f5efe6;
}
.slide[data-palette="gothic_dark"], .solvin-slide.gothic_dark, [data-palette="gothic_dark"] {
  /* Sol.vin Theme Variables */
  --bg-color: #181a1b;
  --bg-window: #232629;
  --text-color: #f3f4f6;
  --text-dim: #9ca3af;
  --link-color: #d97706;
  --border-color: #374151;
  --border-active: #d97706;
  --accent-color: #d97706;
  --accent-secondary: #38bdf8;
  --accent-tertiary: #a855f7;
  --accent-quaternary: #9ca3af;
  --shadow-color: #000000;
  --cube: #f3f4f6;
  --cube-hover: #d97706;
  --emoji-filter: url(#emoji-filter-gothic_dark);

  /* Sunstone Modern Variables */
  --sunstone-bg: #181a1b;
  --sunstone-surface: #232629;
  --sunstone-surface-hover: #2d3135;
  --sunstone-text-primary: #f3f4f6;
  --sunstone-text-secondary: #d1d5db;
  --sunstone-text-muted: #9ca3af;
  --sunstone-accent: #d97706;
  --sunstone-accent-secondary: #38bdf8;
  --sunstone-accent-tertiary: #a855f7;
  --sunstone-border: #374151;
  --sunstone-border-active: #d97706;
  --sunstone-code-bg: #121314;
}
.slide[data-palette="emerald_manuscript"], .solvin-slide.emerald_manuscript, [data-palette="emerald_manuscript"] {
  /* Sol.vin Theme Variables */
  --bg-color: #f7f8f6;
  --bg-window: #ffffff;
  --text-color: #1c1917;
  --text-dim: #78716c;
  --link-color: #065f46;
  --border-color: #d6dbd2;
  --border-active: #065f46;
  --accent-color: #065f46;
  --accent-secondary: #92400e;
  --accent-tertiary: #1e40af;
  --accent-quaternary: #78716c;
  --shadow-color: #000000;
  --cube: #1c1917;
  --cube-hover: #065f46;
  --emoji-filter: url(#emoji-filter-emerald_manuscript);

  /* Sunstone Modern Variables */
  --sunstone-bg: #f7f8f6;
  --sunstone-surface: #ffffff;
  --sunstone-surface-hover: #eff1ed;
  --sunstone-text-primary: #1c1917;
  --sunstone-text-secondary: #292524;
  --sunstone-text-muted: #78716c;
  --sunstone-accent: #065f46;
  --sunstone-accent-secondary: #92400e;
  --sunstone-accent-tertiary: #1e40af;
  --sunstone-border: #d6dbd2;
  --sunstone-border-active: #065f46;
  --sunstone-code-bg: #edf0eb;
}
.slide[data-palette="blackboard_latex"], .solvin-slide.blackboard_latex, [data-palette="blackboard_latex"] {
  /* Sol.vin Theme Variables */
  --bg-color: #151c18;
  --bg-window: #1e2823;
  --text-color: #f9fafb;
  --text-dim: #9ca3af;
  --link-color: #86efac;
  --border-color: #2c3d35;
  --border-active: #86efac;
  --accent-color: #86efac;
  --accent-secondary: #fde047;
  --accent-tertiary: #67e8f9;
  --accent-quaternary: #9ca3af;
  --shadow-color: #000000;
  --cube: #f9fafb;
  --cube-hover: #86efac;
  --emoji-filter: url(#emoji-filter-blackboard_latex);

  /* Sunstone Modern Variables */
  --sunstone-bg: #151c18;
  --sunstone-surface: #1e2823;
  --sunstone-surface-hover: #27342e;
  --sunstone-text-primary: #f9fafb;
  --sunstone-text-secondary: #e5e7eb;
  --sunstone-text-muted: #9ca3af;
  --sunstone-accent: #86efac;
  --sunstone-accent-secondary: #fde047;
  --sunstone-accent-tertiary: #67e8f9;
  --sunstone-border: #2c3d35;
  --sunstone-border-active: #86efac;
  --sunstone-code-bg: #0f1411;
}