/* learn-codebase v2: Glassmorphism + Dialogue Narrative
   Design: Modern dev-tool aesthetic with glass panels, gradient accents, micro-animations.
   Constraint: 1200×700px reveal.js slides. No scrolling. Overflow = split slides. */

/* ========== THEME TOKENS ========== */
:root {
  /* Surface & background */
  --lc-bg: #f0f2f5;
  --lc-bg-gradient: linear-gradient(135deg, #e8ecf3 0%, #f0f2f5 50%, #e4e9f2 100%);
  --lc-glass-bg: rgba(255, 255, 255, 0.65);
  --lc-glass-border: rgba(255, 255, 255, 0.5);
  --lc-glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  /* Text */
  --lc-text: #1a1a2e;
  --lc-text-secondary: #4a5568;
  --lc-muted: #718096;
  /* Accents */
  --lc-accent: #6366f1;
  --lc-accent-hover: #4f46e5;
  --lc-accent-glow: rgba(99, 102, 241, 0.3);
  --lc-accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --lc-accent-light: rgba(99, 102, 241, 0.1);
  /* Semantic */
  --lc-success: #10b981;
  --lc-success-bg: rgba(16, 185, 129, 0.12);
  --lc-error: #ef4444;
  --lc-error-bg: rgba(239, 68, 68, 0.12);
  --lc-warning: #f59e0b;
  /* Code */
  --lc-code-bg: rgba(0, 0, 0, 0.04);
  --lc-border: rgba(0, 0, 0, 0.08);
  --lc-card-bg: rgba(255, 255, 255, 0.7);
  /* Characters */
  --lc-newbie-bg: rgba(59, 130, 246, 0.08);
  --lc-newbie-border: rgba(59, 130, 246, 0.25);
  --lc-newbie-accent: #3b82f6;
  --lc-senior-bg: rgba(139, 92, 246, 0.08);
  --lc-senior-border: rgba(139, 92, 246, 0.25);
  --lc-senior-accent: #8b5cf6;
  /* Grid */
  --lc-grid-color: rgba(99, 102, 241, 0.06);
  /* Blur */
  --lc-blur: 16px;
}

[data-theme="dark"] {
  --lc-bg: #0b0e17;
  --lc-bg-gradient: linear-gradient(135deg, #0b0e17 0%, #111827 50%, #0f1629 100%);
  --lc-glass-bg: rgba(17, 24, 39, 0.7);
  --lc-glass-border: rgba(255, 255, 255, 0.08);
  --lc-glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --lc-text: #e2e8f0;
  --lc-text-secondary: #a0aec0;
  --lc-muted: #718096;
  --lc-accent: #818cf8;
  --lc-accent-hover: #a5b4fc;
  --lc-accent-glow: rgba(129, 140, 248, 0.25);
  --lc-accent-gradient: linear-gradient(135deg, #818cf8, #a78bfa);
  --lc-accent-light: rgba(129, 140, 248, 0.12);
  --lc-success: #34d399;
  --lc-success-bg: rgba(52, 211, 153, 0.12);
  --lc-error: #f87171;
  --lc-error-bg: rgba(248, 113, 113, 0.12);
  --lc-warning: #fbbf24;
  --lc-code-bg: rgba(255, 255, 255, 0.04);
  --lc-border: rgba(255, 255, 255, 0.06);
  --lc-card-bg: rgba(30, 41, 59, 0.6);
  --lc-newbie-bg: rgba(59, 130, 246, 0.1);
  --lc-newbie-border: rgba(59, 130, 246, 0.2);
  --lc-newbie-accent: #60a5fa;
  --lc-senior-bg: rgba(139, 92, 246, 0.1);
  --lc-senior-border: rgba(139, 92, 246, 0.2);
  --lc-senior-accent: #a78bfa;
  --lc-grid-color: rgba(129, 140, 248, 0.04);
  --lc-blur: 20px;
}

/* ========== GLOBAL / REVEAL OVERRIDES ========== */
.reveal {
  background: var(--lc-bg-gradient);
  font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* Subtle grid background */
.reveal::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--lc-grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--lc-grid-color) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* Floating orbs - ambient decoration */
.reveal::after {
  content: '';
  position: fixed;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--lc-accent-glow) 0%, transparent 70%);
  top: -150px;
  right: -150px;
  pointer-events: none;
  z-index: 0;
  animation: orb-drift 20s ease-in-out infinite alternate;
}

@keyframes orb-drift {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-80px, 60px) scale(1.1); }
}

.reveal .slides {
  z-index: 1;
}

.reveal .slides section {
  color: var(--lc-text);
  text-align: left;
}

/* ========== GLASS PANEL — base for all content cards ========== */
.glass-panel {
  background: var(--lc-glass-bg);
  backdrop-filter: blur(var(--lc-blur));
  -webkit-backdrop-filter: blur(var(--lc-blur));
  border: 1px solid var(--lc-glass-border);
  border-radius: 16px;
  box-shadow: var(--lc-glass-shadow);
  padding: 1.2em;
}

/* ========== PROGRESS BAR (top of viewport) ========== */
.chapter-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--lc-border);
  z-index: 100;
}
.chapter-progress .progress-fill {
  height: 100%;
  background: var(--lc-accent-gradient);
  border-radius: 0 2px 2px 0;
  transition: width 0.4s ease;
  box-shadow: 0 0 8px var(--lc-accent-glow);
}

/* Chapter badge (top-left corner) */
.chapter-badge {
  position: fixed;
  top: 12px;
  left: 16px;
  font-size: 0.5em;
  font-weight: 600;
  color: var(--lc-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  z-index: 100;
  opacity: 0.7;
}

/* ========== MICRO-ANIMATIONS ========== */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes scale-in {
  from { opacity: 0; transform: scale(0.95); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--lc-accent-glow); }
  50%      { box-shadow: 0 0 16px 4px var(--lc-accent-glow); }
}
@keyframes slide-right {
  from { opacity: 0; transform: translateX(-20px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes typing-cursor {
  0%, 100% { border-right-color: var(--lc-accent); }
  50%      { border-right-color: transparent; }
}

/* Content animation on slide enter */
.reveal .slides section.present > * {
  animation: fade-up 0.5s ease both;
}
.reveal .slides section.present > *:nth-child(1) { animation-delay: 0s; }
.reveal .slides section.present > *:nth-child(2) { animation-delay: 0.08s; }
.reveal .slides section.present > *:nth-child(3) { animation-delay: 0.16s; }
.reveal .slides section.present > *:nth-child(4) { animation-delay: 0.24s; }
.reveal .slides section.present > *:nth-child(5) { animation-delay: 0.32s; }

/* ========== TITLE SLIDE ========== */
.slide-title {
  text-align: center !important;
}
.slide-title .chapter-num {
  font-size: 0.7em;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: var(--lc-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.3em;
}
.slide-title h1 {
  font-size: 2em;
  font-weight: 800;
  color: var(--lc-text);
  margin-bottom: 0.3em;
  line-height: 1.2;
}
.slide-title .subtitle {
  font-size: 0.7em;
  color: var(--lc-muted);
  font-style: italic;
  margin-bottom: 0.6em;
}
.slide-title .objectives {
  display: inline-block;
  text-align: left;
  background: var(--lc-glass-bg);
  backdrop-filter: blur(var(--lc-blur));
  -webkit-backdrop-filter: blur(var(--lc-blur));
  border: 1px solid var(--lc-glass-border);
  border-radius: 12px;
  padding: 0.6em 1em;
  font-size: 0.55em;
  color: var(--lc-text-secondary);
  line-height: 1.6;
}
.slide-title .objectives strong {
  color: var(--lc-accent);
}
.slide-title .objectives ul {
  margin: 0.2em 0 0 0;
  padding-left: 1.2em;
}
.slide-title .objectives li {
  margin-bottom: 0.1em;
}

/* ========== CONCEPT SLIDE ========== */
.slide-concept h2 {
  font-size: 1.2em;
  font-weight: 700;
  background: var(--lc-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.3em;
}
.slide-concept .content {
  font-size: 0.7em;
  line-height: 1.55;
  color: var(--lc-text-secondary);
}
.slide-concept .content p {
  margin-bottom: 0.35em;
}
.slide-concept .content ul,
.slide-concept .content ol {
  margin: 0.2em 0;
  padding-left: 1.2em;
}
.slide-concept .content li {
  margin-bottom: 0.15em;
}
.slide-concept .content strong {
  color: var(--lc-text);
}
.slide-concept .content code {
  background: var(--lc-code-bg);
  padding: 0.1em 0.3em;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
}

/* Concept: split layout (text + visual) */
.slide-concept .split-layout {
  display: flex;
  gap: 1em;
  align-items: flex-start;
  margin-top: 0.3em;
}
.slide-concept .split-layout .left-col {
  flex: 1;
  min-width: 0;
}
.slide-concept .split-layout .right-col {
  flex: 1;
  min-width: 0;
}

/* ========== CALLOUT BOX ========== */
.callout {
  background: var(--lc-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--lc-glass-border);
  border-left: 3px solid var(--lc-accent);
  padding: 0.5em 0.7em;
  margin: 0.4em 0;
  font-size: 0.9em;
  border-radius: 0 10px 10px 0;
  color: var(--lc-text-secondary);
}
.callout strong,
.callout b {
  color: var(--lc-accent);
}
.callout.callout-warning {
  border-left-color: var(--lc-warning);
}
.callout.callout-warning strong {
  color: var(--lc-warning);
}
.callout.callout-success {
  border-left-color: var(--lc-success);
}
.callout.callout-success strong {
  color: var(--lc-success);
}

/* ========== CODE WALKTHROUGH SLIDE ========== */
.slide-code h2 {
  font-size: 1.15em;
  font-weight: 700;
  background: var(--lc-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.15em;
}
.slide-code .file-path {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
  font-size: 0.5em;
  background: var(--lc-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--lc-glass-border);
  border-radius: 8px;
  padding: 2px 10px;
  color: var(--lc-muted);
  margin-bottom: 0.25em;
}
.slide-code .file-path::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lc-accent-gradient);
  flex-shrink: 0;
}
.slide-code pre {
  max-height: 400px;
  overflow-y: auto;
  border-radius: 12px;
  font-size: 0.45em;
  margin: 0;
  background: var(--lc-glass-bg) !important;
  backdrop-filter: blur(var(--lc-blur));
  -webkit-backdrop-filter: blur(var(--lc-blur));
  border: 1px solid var(--lc-glass-border);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
}
.slide-code pre code {
  font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
}
.slide-code .annotation {
  font-size: 0.6em;
  color: var(--lc-muted);
  margin-top: 0.3em;
  font-style: italic;
}

/* Code slide: side-by-side layout */
.slide-code .code-layout {
  display: flex;
  gap: 0.8em;
  align-items: flex-start;
  margin-top: 0.2em;
}
.slide-code .code-layout .code-col {
  flex: 3;
  min-width: 0;
}
.slide-code .code-layout .text-col {
  flex: 2;
  font-size: 0.6em;
  color: var(--lc-text-secondary);
  line-height: 1.5;
  padding-top: 0.2em;
}
.slide-code .code-layout .text-col .callout {
  font-size: 0.9em;
}
.slide-code .code-layout .text-col p {
  margin-bottom: 0.35em;
}

/* ========== ARCHITECTURE DIAGRAM ========== */
.slide-diagram h2 {
  font-size: 1.2em;
  font-weight: 700;
  background: var(--lc-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.2em;
}
.slide-diagram .mermaid {
  text-align: center;
  margin: 0.3em 0;
  max-height: 450px;
  overflow: hidden;
}
.slide-diagram .mermaid svg {
  max-height: 450px;
  max-width: 100%;
}
.slide-diagram .caption {
  font-size: 0.55em;
  color: var(--lc-muted);
  text-align: center;
  font-style: italic;
}

/* ========== DIALOGUE SLIDE — Core narrative vehicle ========== */
.slide-dialogue h2 {
  font-size: 1.05em;
  font-weight: 700;
  background: var(--lc-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25em;
}

.dialogue {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
  width: 100%;
  max-width: 95%;
}

.chat-bubble {
  display: flex;
  align-items: flex-start;
  gap: 0.35em;
  animation: slide-right 0.4s ease both;
}
.chat-bubble:nth-child(1) { animation-delay: 0.1s; }
.chat-bubble:nth-child(2) { animation-delay: 0.3s; }
.chat-bubble:nth-child(3) { animation-delay: 0.5s; }
.chat-bubble:nth-child(4) { animation-delay: 0.7s; }
.chat-bubble:nth-child(5) { animation-delay: 0.9s; }

/* Avatar */
.chat-bubble .avatar {
  width: 26px;
  height: 26px;
  min-width: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.4em;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(0,0,0,0.12);
  margin-top: 2px;
}

/* Bubble content */
.chat-bubble .bubble-content {
  backdrop-filter: blur(var(--lc-blur));
  -webkit-backdrop-filter: blur(var(--lc-blur));
  padding: 0.3em 0.55em;
  font-size: 0.52em;
  line-height: 1.45;
  border: 1px solid;
}
.chat-bubble .bubble-content .speaker {
  font-weight: 700;
  font-size: 0.75em;
  margin-bottom: 0.1em;
  letter-spacing: 0.03em;
}
.chat-bubble .bubble-content p {
  margin: 0;
  color: var(--lc-text-secondary);
}
.chat-bubble .bubble-content code {
  background: var(--lc-code-bg);
  padding: 0.05em 0.2em;
  border-radius: 3px;
  font-size: 0.88em;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ---- Newbie: LEFT side (like iMessage green/blue) ---- */
.bubble-newbie {
  align-self: flex-start;
  flex-direction: row;
  max-width: 72%;
}
.bubble-newbie .avatar {
  background: var(--lc-newbie-bg);
  border: 1.5px solid var(--lc-newbie-border);
  color: var(--lc-newbie-accent);
}
.bubble-newbie .bubble-content {
  background: var(--lc-newbie-bg);
  border-color: var(--lc-newbie-border);
  border-radius: 2px 12px 12px 12px;
}
.bubble-newbie .speaker {
  color: var(--lc-newbie-accent);
}

/* ---- Senior: RIGHT side (flex reversed, avatar on right) ---- */
.bubble-senior {
  align-self: flex-end;
  flex-direction: row-reverse;
  max-width: 72%;
}
.bubble-senior .avatar {
  background: var(--lc-senior-bg);
  border: 1.5px solid var(--lc-senior-border);
  color: var(--lc-senior-accent);
}
.bubble-senior .bubble-content {
  background: var(--lc-senior-bg);
  border-color: var(--lc-senior-border);
  border-radius: 12px 2px 12px 12px;
  text-align: left;
}
.bubble-senior .speaker {
  color: var(--lc-senior-accent);
  text-align: right;
}

/* ---- Narrator: centered, no avatar ---- */
.bubble-narrator {
  align-self: center;
  max-width: 70%;
}
.bubble-narrator .bubble-content {
  background: var(--lc-accent-light);
  border-color: var(--lc-accent-glow);
  border-radius: 14px;
  text-align: center;
  font-style: italic;
}
.bubble-narrator .bubble-content p {
  color: var(--lc-accent);
}

/* ========== TABLES ========== */
.reveal table {
  font-size: 0.58em;
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
  margin: 0.3em 0;
  border-radius: 12px;
  overflow: hidden;
  background: var(--lc-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--lc-glass-border);
}
.reveal table th,
.reveal table td {
  border: none;
  border-bottom: 1px solid var(--lc-border);
  padding: 0.4em 0.6em;
  text-align: left;
}
.reveal table tr:last-child td {
  border-bottom: none;
}
.reveal table th {
  background: var(--lc-accent-light);
  font-weight: 600;
  color: var(--lc-accent);
}

/* vs-table (comparison table) */
.vs-table th:first-child,
.vs-table td:first-child {
  font-weight: 600;
  color: var(--lc-text);
}

/* ========== QUIZ: MULTIPLE CHOICE ========== */
.quiz-choices {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
  margin-top: 0.5em;
}
.quiz-choices button {
  text-align: left;
  padding: 0.45em 0.8em;
  border: 1.5px solid var(--lc-glass-border);
  border-radius: 10px;
  background: var(--lc-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--lc-text);
  font-size: 0.6em;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.quiz-choices button:hover {
  border-color: var(--lc-accent);
  transform: translateX(4px);
  box-shadow: 0 0 0 1px var(--lc-accent-glow);
}
.quiz-choices button.correct {
  border-color: var(--lc-success);
  background: var(--lc-success-bg);
  animation: scale-in 0.3s ease;
}
.quiz-choices button.correct::after {
  content: ' ✓';
  font-weight: bold;
  color: var(--lc-success);
}
.quiz-choices button.incorrect {
  border-color: var(--lc-error);
  background: var(--lc-error-bg);
  opacity: 0.7;
}
.quiz-choices button.incorrect::after {
  content: ' ✗';
  font-weight: bold;
  color: var(--lc-error);
}
.quiz-explanation {
  font-size: 0.56em;
  color: var(--lc-text-secondary);
  margin-top: 0.5em;
  padding: 0.5em 0.7em;
  background: var(--lc-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--lc-glass-border);
  border-left: 3px solid var(--lc-accent);
  border-radius: 0 10px 10px 0;
  animation: fade-up 0.3s ease;
}

/* ========== QUIZ: SHORT ANSWER ========== */
.short-answer textarea {
  width: 100%;
  min-height: 55px;
  border: 1.5px solid var(--lc-glass-border);
  border-radius: 10px;
  padding: 0.5em;
  font-size: 0.6em;
  background: var(--lc-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--lc-text);
  resize: vertical;
  font-family: inherit;
  transition: border-color 0.2s;
}
.short-answer textarea:focus {
  outline: none;
  border-color: var(--lc-accent);
  box-shadow: 0 0 0 3px var(--lc-accent-glow);
}
.short-answer button,
.short-answer .btn-ref-answer {
  margin-top: 0.3em;
  padding: 0.35em 1.2em;
  background: var(--lc-accent-gradient);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.6em;
  font-weight: 600;
  transition: transform 0.15s, box-shadow 0.15s;
}
.short-answer button:hover,
.short-answer .btn-ref-answer:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--lc-accent-glow);
}
.ref-answer {
  margin-top: 0.4em;
  padding: 0.5em 0.7em;
  background: var(--lc-glass-bg);
  border: 1px solid var(--lc-glass-border);
  border-left: 3px solid var(--lc-success);
  border-radius: 0 10px 10px 0;
  font-size: 0.56em;
  color: var(--lc-text-secondary);
  animation: fade-up 0.3s ease;
}

/* ========== STAR RATING ========== */
.star-rating {
  display: inline-flex;
  gap: 0.35em;
  font-size: 1.6em;
  cursor: pointer;
}
.star-rating .star {
  color: var(--lc-border);
  transition: color 0.2s, transform 0.2s;
}
.star-rating .star:hover {
  transform: scale(1.15);
}
.star-rating .star.active {
  color: var(--lc-warning);
  text-shadow: 0 0 8px rgba(245, 158, 11, 0.5);
  animation: scale-in 0.25s ease;
}

/* ========== FEEDBACK SLIDE ========== */
.slide-feedback {
  text-align: center !important;
}
.slide-feedback h2 {
  font-size: 1.2em;
  font-weight: 700;
  background: var(--lc-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.slide-feedback textarea {
  width: 80%;
  min-height: 50px;
  border: 1.5px solid var(--lc-glass-border);
  border-radius: 10px;
  padding: 0.5em;
  font-size: 0.6em;
  background: var(--lc-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--lc-text);
  font-family: inherit;
  transition: border-color 0.2s;
}
.slide-feedback textarea:focus {
  outline: none;
  border-color: var(--lc-accent);
}
.slide-feedback button.submit-btn {
  margin-top: 0.5em;
  padding: 0.45em 2em;
  background: var(--lc-accent-gradient);
  color: #fff;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.7em;
  font-weight: 600;
  transition: transform 0.15s, box-shadow 0.15s;
}
.slide-feedback button.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--lc-accent-glow);
}

/* ========== SUMMARY SLIDE ========== */
.slide-summary h2 {
  font-size: 1.2em;
  font-weight: 700;
  background: var(--lc-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.slide-summary ul {
  font-size: 0.63em;
  line-height: 1.6;
  list-style: none;
  padding: 0;
}
.slide-summary ul li {
  padding: 0.25em 0;
  padding-left: 1em;
  position: relative;
}
.slide-summary ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lc-accent-gradient);
}
.slide-summary .next-preview {
  margin-top: 0.6em;
  padding: 0.5em 0.8em;
  background: var(--lc-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--lc-glass-border);
  border-left: 3px solid var(--lc-accent);
  border-radius: 0 10px 10px 0;
  font-size: 0.58em;
  color: var(--lc-muted);
}

/* ========== SCENARIO SLIDE (enhanced concept variant) ========== */
.slide-scenario h2 {
  font-size: 1.1em;
  font-weight: 700;
  background: var(--lc-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.2em;
}
.slide-scenario .scenario-prompt {
  background: var(--lc-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--lc-glass-border);
  border-radius: 12px;
  padding: 0.4em 0.7em;
  font-size: 0.65em;
  font-style: italic;
  color: var(--lc-text-secondary);
  margin-bottom: 0.4em;
  display: flex;
  align-items: center;
  gap: 0.4em;
}
.slide-scenario .scenario-prompt::before {
  content: '>';
  font-family: 'JetBrains Mono', monospace;
  font-style: normal;
  font-weight: 700;
  color: var(--lc-accent);
  font-size: 1.2em;
}

/* ========== HIGHLIGHT / EMPHASIS ========== */
.gradient-text {
  background: var(--lc-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.tag {
  display: inline-block;
  padding: 0.1em 0.5em;
  border-radius: 6px;
  font-size: 0.8em;
  font-weight: 600;
}
.tag-accent {
  background: var(--lc-accent-light);
  color: var(--lc-accent);
}
.tag-success {
  background: var(--lc-success-bg);
  color: var(--lc-success);
}
.tag-warning {
  background: rgba(245, 158, 11, 0.12);
  color: var(--lc-warning);
}

/* ========== UTILITY ========== */
.hidden {
  display: none !important;
}