/* SWE Hackers Interactive Documentation Styles */

:root {
  /* Backgrounds */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a2e;
  --bg-card: #16162a;
  
  /* Text */
  --text-primary: #e8e8f0;
  --text-secondary: #a8a8b8;
  --text-muted: #6a6a80;
  
  /* Accents */
  --accent-primary: #7986cb;
  --accent-secondary: #4db6ac;
  --accent-success: #66bb6a;
  --accent-warning: #ffd54f;
  --accent-error: #ef5350;
  
  /* Chapter Themes */
  --accent-stone: #8d6e63;
  --accent-lightning: #ffca28;
  --accent-magnetism: #ab47bc;
  --accent-architect: #42a5f5;
  
  /* Node Colors */
  --node-service: #7986cb;
  --node-page: #4db6ac;
  --node-data: #66bb6a;
  --node-auth: #ffd54f;
  --node-external: #ef5350;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #7986cb, #4db6ac);
  
  /* Borders */
  --border-color: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.12);
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(121, 134, 203, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-medium: 300ms ease;
  --transition-slow: 500ms ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }

code {
  font-family: 'JetBrains Mono', monospace;
  background: var(--bg-tertiary);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

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

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

/* Layout */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header */
.header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1.25rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a.active {
  color: var(--accent-primary);
}

/* Hero Section */
.hero {
  padding: 4rem 0;
  text-align: center;
  opacity: 0;
  transform: translateY(20px);
}

.hero h1 {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--transition-medium);
  opacity: 0;
  transform: translateY(30px);
}

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

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-tertiary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.card h3 {
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tag {
  background: var(--bg-tertiary);
  color: var(--text-muted);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
}

/* Page Content */
.page-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(20px);
}

.page-header h1 {
  margin-bottom: 0.5rem;
}

.page-header p {
  color: var(--text-secondary);
}

.breadcrumb {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.breadcrumb span {
  color: var(--text-muted);
}

/* Sections */
.section {
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(30px);
}

.section h2 {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-primary);
  display: inline-block;
}

.section p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* Diagram Container */
.diagram-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  margin: 1.5rem 0;
}

.diagram-header {
  background: var(--bg-tertiary);
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.diagram-title {
  font-weight: 500;
  font-size: 0.9rem;
}

.diagram-controls {
  display: flex;
  gap: 0.5rem;
}

.diagram-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.diagram-btn:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.diagram-btn.replay-btn {
  background: var(--accent-secondary);
  color: var(--bg-primary);
  border-color: var(--accent-secondary);
  font-weight: 500;
}

.diagram-btn.replay-btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
  transform: scale(1.05);
}

.diagram-canvas {
  height: 500px;
  position: relative;
}

.diagram-canvas.large {
  height: 600px;
}

.diagram-canvas.small {
  height: 350px;
}

.diagram-canvas.storytelling {
  height: 550px;
}

/* Cytoscape node info tooltip */
.node-tooltip {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--accent-primary);
  border-radius: 8px;
  padding: 1rem;
  max-width: 300px;
  z-index: 2000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  box-shadow: var(--shadow-lg), 0 0 20px rgba(121, 134, 203, 0.2);
}

.node-tooltip.visible {
  opacity: 1;
}

.node-tooltip h4 {
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.node-tooltip p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 0;
}

.node-tooltip .connections {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.node-tooltip .connections span {
  display: inline-block;
  background: var(--bg-tertiary);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.7rem;
  margin-right: 0.25rem;
  margin-bottom: 0.25rem;
}

/* Legend */
.diagram-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.legend-dot.service { background: var(--node-service); }
.legend-dot.page { background: var(--node-page); }
.legend-dot.data { background: var(--node-data); }
.legend-dot.auth { background: var(--node-auth); }
.legend-dot.external { background: var(--node-external); }

.legend-line {
  width: 20px;
  height: 2px;
}

.legend-line.solid { background: var(--accent-primary); }
.legend-line.dashed { 
  background: repeating-linear-gradient(
    90deg,
    var(--accent-secondary) 0px,
    var(--accent-secondary) 4px,
    transparent 4px,
    transparent 8px
  );
}

/* Tables */
.table-container {
  overflow-x: auto;
  margin: 1rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: 8px;
  overflow: hidden;
}

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

th {
  background: var(--bg-tertiary);
  font-weight: 500;
  color: var(--text-primary);
}

td {
  color: var(--text-secondary);
}

tr:hover td {
  background: rgba(121, 134, 203, 0.05);
}

/* Code Blocks */
.code-block {
  background: #0d1117;
  border-radius: 8px;
  overflow: hidden;
  margin: 1rem 0;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  background: #161b22;
  border-bottom: 1px solid var(--border-color);
}

.code-lang {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.code-copy {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.code-copy:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

pre {
  padding: 1rem;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  line-height: 1.5;
}

/* Info Box */
.info-box {
  background: rgba(121, 134, 203, 0.1);
  border-left: 4px solid var(--accent-primary);
  padding: 1rem 1.25rem;
  border-radius: 0 8px 8px 0;
  margin: 1rem 0;
}

.info-box.warning {
  background: rgba(255, 213, 79, 0.1);
  border-left-color: var(--accent-warning);
}

.info-box.success {
  background: rgba(102, 187, 106, 0.1);
  border-left-color: var(--accent-success);
}

.info-box h4 {
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.info-box p {
  font-size: 0.875rem;
  margin: 0;
}

/* Navigation Sidebar */
.page-nav {
  position: fixed;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  max-width: 200px;
  opacity: 0;
}

.page-nav h4 {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.page-nav ul {
  list-style: none;
}

.page-nav li {
  margin-bottom: 0.5rem;
}

.page-nav a {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: block;
  padding: 0.25rem 0;
}

.page-nav a:hover,
.page-nav a.active {
  color: var(--accent-primary);
}

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--accent-primary);
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition-medium);
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent-secondary);
  transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 1200px) {
  .page-nav {
    display: none;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .cards-grid {
    grid-template-columns: 1fr;
  }
  
  .diagram-canvas {
    height: 400px;
  }
  
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
}

/* Loading State */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 1rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Diagram Instructions */
.diagram-instructions {
  text-align: center;
  padding: 0.5rem;
  background: var(--bg-tertiary);
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
}

.diagram-instructions span {
  margin: 0 1rem;
}

/* Diagram Animation States */
.diagram-canvas.animating {
  border: 2px solid var(--accent-secondary);
  box-shadow: 0 0 20px rgba(77, 182, 172, 0.2);
}

.diagram-btn.replay-btn.playing {
  animation: pulse-btn 1s ease-in-out infinite;
}

@keyframes pulse-btn {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* ============================================
   STORYTELLING DIAGRAM STYLES
   ============================================ */

/* Story Caption Container */
.story-caption,
.diagram-story {
  padding: 1.5rem;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  min-height: 140px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.story-caption::before,
.diagram-story::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent-secondary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.story-caption.active,
.diagram-story.active {
  background: linear-gradient(135deg, rgba(121, 134, 203, 0.1) 0%, rgba(77, 182, 172, 0.1) 100%);
}

.story-caption.active::before,
.diagram-story.active::before {
  opacity: 1;
}

.caption-content {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.story-icon {
  font-size: 2rem;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.story-icon.visible {
  opacity: 1;
  transform: scale(1);
}

.story-text-content {
  flex: 1;
}

.story-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.story-title.visible {
  opacity: 1;
  transform: translateY(0);
}

.story-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.story-text.visible {
  opacity: 1;
  transform: translateY(0);
}

.story-connection {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding: 0.35rem 0.75rem;
  background: rgba(77, 182, 172, 0.15);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--accent-secondary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.story-connection.visible {
  opacity: 1;
}

/* Word Highlighting (Karaoke Effect) */
span.word {
  display: inline-block;
  transition: all 0.15s ease-out;
  padding: 2px 4px;
  margin: 1px;
  border-radius: 4px;
  background: transparent;
}

span.word.spoken {
  color: #ffffff;
  background-color: rgba(77, 182, 172, 0.4);
  border-bottom: 2px solid rgba(77, 182, 172, 0.6);
}

span.word.current {
  color: #000000;
  background-color: #4db6ac;
  font-weight: 700;
  transform: scale(1.08);
  box-shadow: 0 0 15px rgba(77, 182, 172, 0.6);
  animation: wordPulse 0.2s ease-out;
}

@keyframes wordPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.12); }
  100% { transform: scale(1.08); }
}

/* Progress Dots */
.story-progress {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.progress-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 2px solid var(--border-light);
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

.progress-dot:hover {
  transform: scale(1.3);
  border-color: var(--accent-primary);
}

.progress-dot.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px rgba(121, 134, 203, 0.5);
  transform: scale(1.2);
}

.progress-dot.completed {
  background: var(--accent-secondary);
  border-color: var(--accent-secondary);
}

/* Story Step Container */
.story-step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.story-content {
  flex: 1;
}

/* Playback Controls Row */
.playback-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.playback-left {
  flex-shrink: 0;
}

.playback-center {
  flex: 1;
  display: flex;
  justify-content: center;
}

.playback-right {
  flex-shrink: 0;
  display: flex;
  gap: 0.5rem;
}

/* Play Button */
.diagram-btn.play-btn {
  background: var(--accent-secondary);
  color: var(--bg-primary);
  border-color: var(--accent-secondary);
  font-weight: 600;
  padding: 0.5rem 1rem;
  min-width: 100px;
}

.diagram-btn.play-btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: scale(1.05);
}

.diagram-btn.play-btn.playing {
  background: var(--accent-warning);
  border-color: var(--accent-warning);
  color: var(--bg-primary);
}

.diagram-btn.play-btn.paused {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* Small Diagram Buttons */
.diagram-btn.small {
  padding: 0.4rem 0.6rem;
  font-size: 0.75rem;
  min-width: auto;
}

/* Control Groups */
.control-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.playback-controls .btn-play {
  background: var(--accent-secondary);
  color: var(--bg-primary);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  min-width: 100px;
  font-size: 0.85rem;
}

.playback-controls .btn-play:hover {
  background: var(--accent-primary);
  color: white;
  transform: scale(1.05);
}

.playback-controls .btn-play.playing {
  background: var(--accent-warning);
}

.playback-controls .btn-play.paused {
  background: var(--accent-primary);
  color: white;
}

.playback-controls .utility-btns {
  display: flex;
  gap: 0.5rem;
}

.playback-controls .utility-btns button {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.playback-controls .utility-btns button:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

/* Settings Bar */
.settings-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.settings-bar select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
}

.settings-bar select:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.settings-bar label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Audio Toggle */
.audio-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: 0.8rem;
}

.audio-toggle:hover {
  border-color: var(--accent-primary);
}

.audio-toggle.muted {
  opacity: 0.6;
}

.audio-toggle.speaking {
  border-color: var(--accent-secondary);
  box-shadow: 0 0 10px rgba(77, 182, 172, 0.3);
}

.audio-icon {
  font-size: 1rem;
}

.audio-label {
  color: var(--text-secondary);
}

/* Voice Select */
.voice-select {
  min-width: 150px;
}

/* Audio Info Section */
.audio-info-section .info-box.compact {
  padding: 1rem;
}

.audio-info-section .info-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.audio-info-section .info-icon {
  font-size: 1.5rem;
}

.audio-info-section .info-header h4 {
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
}

.audio-info-section .info-header p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.voice-options {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.voice-badge {
  background: var(--bg-tertiary);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Mobile Responsive for Storytelling */
@media (max-width: 640px) {
  .playback-controls {
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
  }

  .playback-left {
    order: 1;
  }

  .playback-center {
    order: 3;
    flex-basis: 100%;
    margin-top: 0.25rem;
  }

  .playback-right {
    order: 2;
    margin-left: auto;
  }

  .diagram-btn.play-btn {
    padding: 0.5rem 0.75rem;
    min-width: 85px;
    font-size: 0.85rem;
  }

  .diagram-btn.small {
    padding: 0.35rem 0.5rem;
    font-size: 0.7rem;
  }

  .playback-controls .btn-play {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
  }

  .playback-controls .story-progress {
    width: 100%;
    justify-content: center;
    padding: 0.5rem 0;
  }

  .playback-controls .utility-btns {
    width: 100%;
    justify-content: center;
  }

  .settings-bar {
    flex-wrap: wrap;
    gap: 0.6rem;
    padding: 0.5rem 0.75rem;
  }

  .settings-bar select {
    padding: 0.3rem 0.4rem;
    font-size: 0.75rem;
  }

  .voice-select {
    max-width: 140px;
    min-width: 120px;
  }

  .audio-toggle {
    justify-content: center;
    padding: 0.4rem 0.6rem;
  }

  .story-caption,
  .diagram-story {
    padding: 1rem;
    min-height: 120px;
  }

  .story-step {
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
  }

  .story-icon {
    font-size: 1.75rem;
  }

  .story-title {
    font-size: 1rem;
  }

  .story-text {
    font-size: 0.9rem;
  }

  .story-progress {
    gap: 0.35rem;
  }

  .progress-dot {
    width: 10px;
    height: 10px;
  }

  .diagram-canvas.storytelling {
    height: 400px;
  }
}

/* ============================================
   QUIZ SYSTEM STYLES
   ============================================ */

.quiz-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  margin-top: 1.5rem;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.quiz-header h4 {
  font-size: 1rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quiz-progress {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.quiz-progress .score {
  color: var(--accent-secondary);
  font-weight: 600;
}

.quiz-carousel {
  position: relative;
  min-height: 280px;
}

.quiz-question {
  display: none;
  padding: 1.5rem;
  animation: fadeIn 0.3s ease;
}

.quiz-question.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.question-number {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.question-text {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.quiz-option {
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.85rem 1rem;
  border-radius: 8px;
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.quiz-option:hover:not(.correct):not(.incorrect) {
  border-color: var(--accent-primary);
  background: rgba(121, 134, 203, 0.1);
}

.quiz-option.correct {
  border-color: var(--accent-success);
  background: rgba(102, 187, 106, 0.15);
  cursor: default;
}

.quiz-option.incorrect {
  border-color: var(--accent-error);
  background: rgba(239, 83, 80, 0.1);
  cursor: default;
}

.quiz-feedback {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  line-height: 1.5;
  display: none;
}

.quiz-feedback.show {
  display: block;
  animation: fadeIn 0.3s ease;
}

.quiz-feedback.correct {
  background: rgba(102, 187, 106, 0.1);
  border-left: 3px solid var(--accent-success);
  color: var(--accent-success);
}

.quiz-feedback.incorrect {
  background: rgba(239, 83, 80, 0.1);
  border-left: 3px solid var(--accent-error);
  color: var(--text-secondary);
}

/* Quiz Navigation */
.quiz-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
}

.quiz-nav-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.quiz-nav-btn:hover:not(:disabled) {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.quiz-nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.quiz-dots {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.quiz-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--border-light);
  cursor: pointer;
  transition: all 0.2s ease;
}

.quiz-dot:hover {
  transform: scale(1.3);
  border-color: var(--accent-primary);
}

.quiz-dot.active {
  transform: scale(1.2);
  border-color: var(--accent-primary);
  background: var(--accent-primary);
}

.quiz-dot.correct {
  background: var(--accent-success);
  border-color: var(--accent-success);
}

.quiz-dot.incorrect {
  background: var(--accent-error);
  border-color: var(--accent-error);
}

/* Quiz Mobile Responsive */
@media (max-width: 640px) {
  .quiz-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .quiz-question {
    padding: 1rem;
  }

  .question-text {
    font-size: 1rem;
  }

  .quiz-option {
    padding: 0.75rem;
    font-size: 0.9rem;
  }

  .quiz-nav {
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .quiz-dots {
    width: 100%;
    order: -1;
  }
}

/* ============================================
   EDGE PARTICLE ANIMATIONS
   ============================================ */

/* Particle styles removed - using dashed edge animation only */

/* Node glow removed - only edges should have particle effects */

/* Completed edge pulse on transition */
@keyframes edgeComplete {
  0% { 
    filter: drop-shadow(0 0 0px #4db6ac);
  }
  50% { 
    filter: drop-shadow(0 0 15px #80cbc4);
  }
  100% { 
    filter: drop-shadow(0 0 5px #4db6ac);
  }
}

/* Node breathing animation removed - only edges animate */