/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 90%; }
html, body { height: 100%; overflow: hidden; }

/* ============================================
   ACCESSIBILITY UTILITIES
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 16px;
  z-index: 9999;
  background: var(--accent-cyan);
  color: var(--dark-bg);
  padding: 8px 16px;
  border-radius: 0 0 6px 6px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}
body {
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  background: #0B1D3A;
  color: #1a2332;
  -webkit-font-smoothing: antialiased;
}

/* ============================================
   DESIGN TOKENS
   ============================================ */
:root {
  --bg-light: #F0F4F8;
  --bg-panel: #E2E8F0;
  --text-dark: #0B1D3A;
  --text-muted: #4A5568;
  --accent-navy: #0B1D3A;
  --accent-blue: #3B6FB5;
  --accent-cyan: #4ECDC4;
  --accent-light-blue: #6FA8DC;
  --accent-red: #C05B6E;
  --accent-amber: #B08840;
  --accent-green: #5B8A6F;
  --dark-bg: #0B1D3A;
  --dark-bg-lighter: #132D54;
  --light-text: #E2E8F0;
  --light-text-50: rgba(226, 232, 240, 0.5);
  --code-bg: #1a1a2e;
  --code-text: #e2e8f0;
}

/* ============================================
   DECK ENGINE
   ============================================ */
#deck {
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

.slide {
  position: absolute;
  inset: 0;
  display: flex;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.6s ease, visibility 0.6s ease;
  overflow: hidden;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  z-index: 2;
}

/* ============================================
   LAYOUT TYPES
   ============================================ */

/* Split-screen: content left, stage right */
.layout-split {
  flex-direction: row;
  background: var(--bg-light);
}

.layout-split > .content {
  flex: 0 0 50%;
  padding: clamp(20px, 3vh, 45px) clamp(24px, 2.5vw, 50px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(78, 205, 196, 0.2) transparent;
}
.layout-split > .content::-webkit-scrollbar { width: 4px; }
.layout-split > .content::-webkit-scrollbar-thumb { background: rgba(78, 205, 196, 0.2); border-radius: 2px; }
.layout-split > .content::-webkit-scrollbar-track { background: transparent; }

.layout-split > .stage {
  flex: 1;
  position: relative;
  background: var(--bg-panel);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Full-bleed dark */
.layout-full-dark {
  background: var(--dark-bg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: clamp(30px, 5vh, 80px) clamp(30px, 5vw, 100px);
  background-image:
    radial-gradient(ellipse at 70% 20%, rgba(59, 111, 181, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(78, 205, 196, 0.04) 0%, transparent 50%);
}

.layout-full-dark h1,
.layout-full-dark h2,
.layout-full-dark h3,
.layout-full-dark p,
.layout-full-dark li,
.layout-full-dark .label {
  color: var(--light-text);
}

.layout-full-dark h2 { margin-bottom: 0.8em; }
.layout-grid h2 { text-align: center; margin-bottom: 0.8em; }

/* Full-bleed light */
.layout-full-light {
  background: var(--bg-light);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: clamp(30px, 5vh, 80px) clamp(40px, 5vw, 120px);
  background-image:
    radial-gradient(ellipse at 80% 20%, rgba(59, 111, 181, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 70%, rgba(78, 205, 196, 0.03) 0%, transparent 50%);
}

/* Section divider */
.layout-divider {
  background: var(--dark-bg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px;
}

.layout-divider::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 70%, rgba(78, 205, 196, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 30%, rgba(59, 111, 181, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.layout-divider .section-label {
  font-family: 'DM Sans', sans-serif;
  font-weight: 400;
  font-size: clamp(0.85rem, 1.3vw, 1.05rem);
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--accent-cyan);
  margin-bottom: 1.5em;
  position: relative;
}

.layout-divider h2 {
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--light-text);
  line-height: 1.15;
  max-width: 20ch;
  position: relative;
  letter-spacing: -0.02em;
}

.layout-divider .divider-line {
  width: 60px;
  height: 3px;
  background: var(--accent-cyan);
  margin-top: 2em;
  position: relative;
}

/* Grid layout */
.layout-grid {
  background: var(--bg-light);
  flex-direction: column;
  padding: clamp(24px, 3.5vh, 50px) clamp(40px, 5vw, 80px);
  justify-content: center;
  background-image:
    radial-gradient(ellipse at 80% 20%, rgba(59, 111, 181, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 10% 90%, rgba(78, 205, 196, 0.03) 0%, transparent 50%);
}

/* Content-heavy layout for prompt examples */
.layout-content {
  background: var(--bg-light);
  flex-direction: column;
  padding: clamp(20px, 3vh, 40px) clamp(40px, 5vw, 100px);
  justify-content: center;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(78, 205, 196, 0.2) transparent;
  background-image:
    radial-gradient(ellipse at 90% 10%, rgba(59, 111, 181, 0.03) 0%, transparent 50%);
}
.layout-content::-webkit-scrollbar { width: 4px; }
.layout-content::-webkit-scrollbar-thumb { background: rgba(78, 205, 196, 0.2); border-radius: 2px; }
.layout-content::-webkit-scrollbar-track { background: transparent; }

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.15;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); margin-bottom: 0.5em; }
h3 { font-size: clamp(1.2rem, 2.2vw, 1.6rem); margin-bottom: 0.4em; }
h4 { font-size: clamp(1.05rem, 1.6vw, 1.25rem); margin-bottom: 0.3em; }

p, li {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  line-height: 1.6;
  color: var(--text-muted);
}

ul { list-style: none; padding-left: 0; }
ul li { padding-left: 1.2em; position: relative; margin-bottom: 0.4em; }
ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

.label {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(0.78rem, 1.15vw, 0.95rem);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 600;
  margin-bottom: 0.8em;
  display: block;
}

.label-cyan { color: var(--accent-cyan); }
.label-blue { color: var(--accent-blue); }
.label-navy { color: var(--accent-navy); }

strong { color: var(--text-dark); font-weight: 700; }

blockquote {
  font-style: italic;
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  color: var(--text-muted);
  border-left: 3px solid var(--accent-cyan);
  padding-left: 1em;
  margin: 1em 0;
}

/* ============================================
   COMPONENTS
   ============================================ */

/* Cards */
.card {
  background: transparent;
  border-radius: 8px;
  padding: clamp(12px, 1.5vh, 20px) clamp(16px, 2vw, 24px);
  margin-bottom: 0.8em;
  border-left: 2px solid rgba(59, 111, 181, 0.3);
}

.card-cyan { border-left-color: rgba(78, 205, 196, 0.4); }
.card-navy { border-left-color: rgba(11, 29, 58, 0.3); }

.card h4 { margin-bottom: 0.2em; }
.card p { font-size: clamp(0.9rem, 1.3vw, 1.1rem); margin-bottom: 0; }

/* Prompt display blocks */
.prompt-block {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 8px;
  padding: clamp(14px, 2vh, 24px) clamp(16px, 2vw, 28px);
  padding-top: clamp(32px, 4vh, 42px);
  font-family: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  font-size: clamp(0.82rem, 1.2vw, 1rem);
  line-height: 1.65;
  margin: 0.8em 0;
  position: relative;
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.prompt-block .prompt-label {
  position: absolute;
  top: 8px;
  right: 12px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.prompt-bad .prompt-label { background: rgba(192, 91, 110, 0.15); color: var(--accent-red); }
.prompt-mid .prompt-label { background: rgba(176, 136, 64, 0.15); color: var(--accent-amber); }
.prompt-good .prompt-label { background: rgba(91, 138, 111, 0.15); color: var(--accent-green); }

.prompt-bad { border-left: 2px solid var(--accent-red); }
.prompt-mid { border-left: 2px solid var(--accent-amber); }
.prompt-good { border-left: 2px solid var(--accent-green); }

/* Quality indicator badges */
.quality-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: clamp(0.8rem, 1.1vw, 0.95rem);
  font-weight: 600;
  margin-bottom: 0.6em;
}

.badge-bad { background: rgba(229, 62, 62, 0.12); color: var(--accent-red); }
.badge-mid { background: rgba(214, 158, 46, 0.12); color: var(--accent-amber); }
.badge-good { background: rgba(56, 161, 105, 0.12); color: var(--accent-green); }

/* Grid helpers */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(12px, 2vw, 24px);
  width: 100%;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(12px, 2vw, 24px);
  width: 100%;
}

/* Roadmap timeline */
.roadmap {
  display: flex;
  gap: 0;
  width: 100%;
  max-width: 900px;
  margin: 2em auto;
}

.roadmap-item {
  flex: 1;
  padding: clamp(16px, 2vh, 28px) clamp(14px, 1.5vw, 24px);
  background: var(--dark-bg-lighter);
  border-top: 3px solid var(--accent-blue);
  position: relative;
  transition: transform 0.3s ease;
}

.roadmap-item.active {
  background: rgba(78, 205, 196, 0.1);
  border-top-color: var(--accent-cyan);
  transform: scale(1.03);
}

.roadmap-item:first-child { border-radius: 8px 0 0 8px; }
.roadmap-item:last-child { border-radius: 0 8px 8px 0; }

.roadmap-item .week-label {
  font-size: clamp(0.7rem, 1vw, 0.85rem);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-cyan);
  margin-bottom: 0.5em;
  font-weight: 600;
}

.roadmap-item h4 {
  color: var(--light-text);
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(0.95rem, 1.4vw, 1.15rem);
  margin-bottom: 0.3em;
}

.roadmap-item p {
  font-size: clamp(0.8rem, 1.1vw, 0.95rem);
  color: var(--light-text-50);
  line-height: 1.4;
}

/* Screenshot placeholder */
.screenshot-placeholder {
  background: var(--bg-panel);
  border: 2px dashed #CBD5E0;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(20px, 3vh, 40px);
  color: var(--text-muted);
  min-height: 200px;
  width: 100%;
  max-width: 100%;
}

.screenshot-placeholder .placeholder-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5em;
  opacity: 0.5;
}

.screenshot-placeholder .placeholder-text {
  font-size: clamp(0.85rem, 1.2vw, 1rem);
  text-align: center;
  max-width: 300px;
}

/* Screenshot image (replaces placeholder) */
.screenshot-img {
  max-width: 100%;
  max-height: 55vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

/* Dark screenshot placeholder */
.screenshot-placeholder-dark {
  background: var(--dark-bg-lighter);
  border-color: rgba(226, 232, 240, 0.15);
  color: var(--light-text-50);
}

/* Model list */
.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: clamp(8px, 1.2vw, 14px);
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
}

.model-card {
  background: var(--dark-bg-lighter);
  border-radius: 8px;
  padding: clamp(10px, 1.5vh, 18px) clamp(12px, 1.5vw, 20px);
  border-left: 3px solid var(--accent-blue);
}

.model-card h4 {
  color: var(--light-text);
  font-size: clamp(0.85rem, 1.2vw, 1rem);
  margin-bottom: 0.2em;
}

.model-card p {
  color: var(--light-text-50);
  font-size: clamp(0.75rem, 1vw, 0.88rem);
  line-height: 1.4;
}

/* Building blocks icons */
.block-card {
  background: transparent;
  border-radius: 10px;
  padding: clamp(16px, 2vh, 28px) clamp(14px, 1.5vw, 24px);
  text-align: center;
  box-shadow: none;
  border: 1px solid rgba(11, 29, 58, 0.08);
  transition: transform 0.2s ease;
}

.block-card:hover { transform: translateY(-2px); }

.block-icon {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  margin-bottom: 0.5em;
  display: block;
}

.block-card h4 {
  font-size: clamp(0.95rem, 1.3vw, 1.1rem);
  margin-bottom: 0.3em;
}

.block-card p {
  font-size: clamp(0.82rem, 1.1vw, 0.95rem);
  line-height: 1.4;
}

/* Comparison side-by-side */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(16px, 2vw, 28px);
  width: 100%;
  margin: 1em 0;
}

.comparison-panel {
  background: var(--code-bg);
  border-radius: 8px;
  padding: clamp(14px, 2vh, 24px);
  color: var(--code-text);
}

.comparison-panel h4 {
  color: var(--light-text);
  font-size: clamp(0.9rem, 1.2vw, 1.05rem);
  margin-bottom: 0.6em;
  padding-bottom: 0.4em;
  border-bottom: 1px solid rgba(226, 232, 240, 0.1);
}

.comparison-panel p, .comparison-panel li {
  font-size: clamp(0.85rem, 1.1vw, 0.98rem);
  color: rgba(226, 232, 240, 0.8);
  line-height: 1.5;
}

.comparison-panel.panel-muted {
  background: #2a2a3e;
}

/* Step reveal for progressive disclosure */
.step-hidden {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  pointer-events: none;
}
.step-hidden.step-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Stream-in for bullet lists following question headings */
.stream-list li {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.slide.active .stream-list li.streamed {
  opacity: 1;
  transform: translateY(0);
}

/* Tip callout */
.tip-box {
  background: transparent;
  border-left: 2px solid rgba(78, 205, 196, 0.3);
  border-radius: 0;
  padding: clamp(10px, 1.5vh, 18px) clamp(14px, 1.5vw, 22px);
  margin: 0.8em 0;
}

.tip-box p {
  font-size: clamp(0.88rem, 1.2vw, 1.05rem);
  color: var(--text-muted);
}

.tip-box strong {
  color: var(--accent-navy);
}

/* Warning callout */
.warning-box {
  background: transparent;
  border-left: 2px solid rgba(176, 136, 64, 0.3);
  border-radius: 0;
  padding: clamp(10px, 1.5vh, 18px) clamp(14px, 1.5vw, 22px);
  margin: 0.8em 0;
}

/* ============================================
   FLOW DIAGRAM (Slide 3)
   ============================================ */
.flow-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  width: 100%;
  max-width: 240px;
  margin: 0 auto;
  position: relative;
}

.flow-node {
  text-align: center;
  padding: clamp(10px, 1.2vh, 16px) clamp(14px, 1.8vw, 24px);
  border-radius: 12px;
  position: relative;
  flex-shrink: 0;
  width: 100%;
}

.flow-node-icon {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 6px;
  line-height: 1;
}

.flow-node-label {
  font-family: 'DM Sans', sans-serif;
  font-weight: 700;
  font-size: clamp(0.78rem, 1.1vw, 0.92rem);
  color: var(--text-dark);
  margin-bottom: 3px;
}

.flow-node-desc {
  font-size: clamp(0.65rem, 0.9vw, 0.78rem);
  color: var(--text-muted);
  line-height: 1.3;
}

.flow-node-code {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: clamp(0.75rem, 1vw, 0.88rem);
  color: var(--text-dark);
}

/* Node styles */
.flow-instructor {
  background: white;
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 4px 20px rgba(78, 205, 196, 0.15);
}

.flow-prompt {
  background: var(--dark-bg);
  border: 2px solid rgba(78, 205, 196, 0.4);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2), 0 0 40px rgba(78, 205, 196, 0.08);
  /* inherits width: 100% from .flow-node */
}

.flow-prompt .flow-node-code { color: var(--light-text); }
.flow-prompt .flow-node-desc { color: var(--accent-cyan); }

.flow-model {
  background: var(--dark-bg-lighter);
  border: 2px solid var(--accent-blue);
  box-shadow: 0 4px 20px rgba(59, 111, 181, 0.15);
}

.flow-model .flow-node-label { color: var(--light-text); }
.flow-model .flow-node-desc { color: var(--light-text-50); }

.flow-student {
  background: white;
  border: 2px solid var(--accent-blue);
  box-shadow: 0 4px 20px rgba(59, 111, 181, 0.1);
}

/* Connectors */
.flow-connector {
  width: 2px;
  height: clamp(20px, 3vh, 32px);
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.flow-connector-line {
  width: 2px;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.flow-connector-line::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-cyan);
  opacity: 0.25;
}

.flow-connector-line::after {
  content: '';
  position: absolute;
  left: 0;
  top: -30%;
  width: 100%;
  height: 30%;
  background: linear-gradient(180deg, transparent, var(--accent-cyan), transparent);
  animation: flow-pulse 2.5s ease-in-out infinite;
}

.flow-connector.connector-hidden .flow-connector-line::before {
  background: var(--accent-cyan);
  opacity: 0.12;
  background-image: repeating-linear-gradient(
    180deg, transparent, transparent 4px, var(--bg-panel) 4px, var(--bg-panel) 8px
  );
}

.flow-connector.connector-hidden .flow-connector-line::after {
  animation-delay: 0.8s;
}

.flow-connector.connector-shaped .flow-connector-line::before {
  background: var(--accent-blue);
  opacity: 0.25;
}

.flow-connector.connector-shaped .flow-connector-line::after {
  background: linear-gradient(180deg, transparent, var(--accent-blue), transparent);
  animation-delay: 1.6s;
}

.flow-connector-label {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(0.58rem, 0.8vw, 0.68rem);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  white-space: nowrap;
  opacity: 0.6;
}

.flow-connector-arrow {
  position: absolute;
  bottom: -1px;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 7px solid var(--accent-cyan);
  opacity: 0.5;
}

.flow-connector.connector-shaped .flow-connector-arrow {
  border-top-color: var(--accent-blue);
}

/* ============================================
   THEATER DIAGRAM (Slide 3)
   ============================================ */
.theater-diagram {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 380px;
  margin: 0 auto;
  gap: 0;
}

.theater-backstage {
  background: rgba(11, 29, 58, 0.04);
  border: 1px dashed rgba(11, 29, 58, 0.12);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  padding: clamp(10px, 1.5vh, 16px) clamp(12px, 1.5vw, 18px);
}

.theater-backstage-row {
  display: flex;
  align-items: center;
  gap: clamp(4px, 0.8vw, 10px);
}

.theater-arrow-h {
  flex-shrink: 0;
}

.theater-zone-label {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(0.55rem, 0.75vw, 0.65rem);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 600;
  color: var(--accent-cyan);
  text-align: center;
  margin-bottom: clamp(4px, 0.6vh, 8px);
}

.theater-curtain {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: clamp(6px, 1vh, 10px) 0;
}

.theater-curtain-line {
  flex: 1;
  height: 1px;
  background: repeating-linear-gradient(
    90deg, var(--accent-amber), var(--accent-amber) 6px, transparent 6px, transparent 12px
  );
  opacity: 0.5;
}

.theater-curtain-label {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(0.52rem, 0.7vw, 0.6rem);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-amber);
  white-space: nowrap;
  font-weight: 600;
}

.theater-frontstage {
  background: rgba(59, 111, 181, 0.04);
  border: 1px solid rgba(59, 111, 181, 0.1);
  border-top: none;
  border-radius: 0 0 10px 10px;
  padding: clamp(10px, 1.5vh, 16px) clamp(12px, 1.5vw, 18px);
}

.theater-conversation {
  display: flex;
  flex-direction: column;
  gap: clamp(6px, 1vh, 10px);
}

.theater-msg {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: clamp(6px, 1vh, 10px) clamp(10px, 1.2vw, 14px);
  border-radius: 8px;
  font-size: clamp(0.7rem, 0.95vw, 0.82rem);
  line-height: 1.4;
}

.theater-msg-who {
  font-family: 'DM Sans', sans-serif;
  font-weight: 700;
  font-size: clamp(0.6rem, 0.8vw, 0.7rem);
}

.theater-msg-text {
  font-style: italic;
  color: var(--text-muted);
}

.theater-msg-user {
  background: white;
  border: 1px solid rgba(59, 111, 181, 0.15);
  align-self: flex-end;
  max-width: 85%;
}

.theater-msg-user .theater-msg-who { color: var(--accent-blue); }

.theater-msg-ai {
  background: var(--dark-bg);
  border: 1px solid rgba(78, 205, 196, 0.2);
  align-self: flex-start;
  max-width: 85%;
}

.theater-msg-ai .theater-msg-who { color: var(--accent-cyan); }
.theater-msg-ai .theater-msg-text { color: var(--light-text-50); }

/* Step labels for flow diagram */
.flow-step-label {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(0.6rem, 0.85vw, 0.72rem);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: clamp(4px, 0.6vh, 8px);
  margin-top: clamp(2px, 0.4vh, 6px);
}

/* V2 layout: two inputs merging into model */
.flow-diagram-v2 {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

.flow-inputs {
  display: flex;
  gap: clamp(16px, 2.5vw, 32px);
  width: 100%;
}

.flow-input-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.flow-input-col .flow-node {
  width: 100%;
}

.flow-input-col .flow-connector {
  margin: 0 auto;
}

.flow-merge {
  width: 100%;
  height: clamp(24px, 3.5vh, 36px);
}

.flow-merge-svg {
  width: 100%;
  height: 100%;
}

.flow-user-prompt {
  background: white;
  border: 2px solid var(--accent-blue);
  box-shadow: 0 4px 20px rgba(59, 111, 181, 0.1);
}

.flow-response {
  background: white;
  border: 2px solid var(--accent-green);
  box-shadow: 0 4px 20px rgba(56, 161, 105, 0.1);
}

/* Hidden badge */
.flow-hidden-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--accent-amber);
  color: white;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.55rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 2px 6px;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(214, 158, 46, 0.3);
}

/* ============================================
   CAROUSEL
   ============================================ */
.carousel {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.carousel-item {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.5s ease;
  padding: clamp(12px, 2vh, 24px);
}

.carousel-item.active { opacity: 1; }

.carousel-item img {
  max-width: 92%;
  max-height: 65vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.carousel-caption {
  margin-top: clamp(8px, 1.2vh, 16px);
  font-size: clamp(0.85rem, 1.3vw, 1.05rem);
  color: var(--text-dark);
  text-align: center;
  max-width: 80%;
  line-height: 1.5;
  background: rgba(255, 255, 255, 0.9);
  padding: 0.4em 0.8em;
  border-radius: 4px;
}

.carousel-caption strong {
  color: var(--text-dark);
}

.carousel-dots {
  position: absolute;
  bottom: clamp(8px, 1.5vh, 16px);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 5;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #CBD5E0;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
  padding: 0;
  position: relative;
}

/* Expand touch target to 44px without changing visual size */
.carousel-dot::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
}

.carousel-dot.active {
  background: var(--accent-cyan);
  transform: scale(1.3);
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(11, 29, 58, 0.6);
  color: white;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.carousel:hover .carousel-arrow { opacity: 1; }
.carousel-arrow-prev { left: 8px; }
.carousel-arrow-next { right: 8px; }

/* ============================================
   LOGO WATERMARK
   ============================================ */
.logo-watermark {
  position: fixed;
  top: clamp(12px, 2vh, 18px);
  right: clamp(12px, 2vw, 18px);
  height: clamp(22px, 3vh, 32px);
  opacity: 0.15;
  z-index: 100;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

/* JS controls visibility — hidden by default on title/closing */
.logo-watermark.hidden { opacity: 0; }

/* ============================================
   NAVIGATION BAR
   ============================================ */
#nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px;
  background: rgba(11, 29, 58, 0.9);
  backdrop-filter: blur(10px);
  opacity: 0;
  transition: opacity 0.4s ease;
}

#nav-bar.visible { opacity: 1; }
#nav-bar:hover { opacity: 1; }
#nav-bar:focus-within { opacity: 1; }

#nav-bar .nav-info {
  font-size: 0.8rem;
  color: var(--light-text-50);
  font-weight: 500;
}

#nav-bar .nav-info strong {
  color: var(--accent-cyan);
}

#progress-track {
  flex: 1;
  height: 2px;
  background: rgba(226, 232, 240, 0.1);
  margin: 0 20px;
  border-radius: 2px;
  overflow: hidden;
}

#progress-bar {
  height: 100%;
  background: var(--accent-cyan);
  width: 0%;
  transition: width 0.4s ease;
  border-radius: 2px;
}

#nav-bar .nav-keys {
  font-size: 0.72rem;
  color: var(--light-text-50);
}

#nav-bar .nav-keys kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid rgba(226, 232, 240, 0.2);
  border-radius: 3px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.68rem;
  margin: 0 2px;
}

/* ============================================
   OVERVIEW MODE
   ============================================ */
body.overview-mode #deck {
  overflow-y: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 24px;
  background: #060d18;
  align-content: flex-start;
}

body.overview-mode .slide {
  position: relative;
  width: calc(25% - 12px);
  height: auto;
  aspect-ratio: 16 / 9;
  opacity: 1;
  visibility: visible;
  border-radius: 6px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  /* Render slide at full size internally, then scale to fit thumbnail */
  width: 100vw;
  height: 100vh;
  transform: scale(0.22);
  transform-origin: top left;
  margin-right: calc(-100vw * 0.78 + 16px);
  margin-bottom: calc(-100vh * 0.78 + 16px);
}

body.overview-mode .slide:hover {
  box-shadow: 0 4px 20px rgba(78, 205, 196, 0.2);
  outline: 2px solid rgba(78, 205, 196, 0.4);
  outline-offset: 2px;
}

body.overview-mode .slide.active {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

body.overview-mode #nav-bar { display: none; }

/* ============================================
   SPECIAL SLIDE STYLES
   ============================================ */

/* Title slide */
.title-slide {
  background: var(--dark-bg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0;
  overflow: hidden;
}

.title-slide-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  flex: 1;
  z-index: 1;
  padding: clamp(30px, 5vh, 80px) clamp(30px, 5vw, 100px);
}

.title-slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 50%, rgba(59, 111, 181, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 20% 70%, rgba(78, 205, 196, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 80% 30%, rgba(111, 168, 220, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.title-slide::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent 0%, var(--accent-cyan) 30%, var(--accent-blue) 70%, transparent 100%);
  opacity: 0.5;
}

.title-slide .title-logo {
  height: clamp(50px, 8vh, 80px);
  margin-bottom: clamp(24px, 4vh, 48px);
  position: relative;
  background: rgba(255, 255, 255, 0.92);
  padding: clamp(10px, 1.5vh, 18px) clamp(20px, 3vw, 36px);
  border-radius: 10px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
}

.title-slide h1 {
  color: var(--light-text);
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  font-weight: 800;
  margin-bottom: 0.3em;
  position: relative;
  max-width: 18ch;
  letter-spacing: -0.02em;
}

.title-slide .subtitle {
  color: var(--accent-cyan);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 400;
  margin-bottom: 1.5em;
  position: relative;
}

.title-slide .meta {
  color: var(--light-text-50);
  font-size: clamp(0.85rem, 1.2vw, 1.05rem);
  position: relative;
}

/* Prompt progression slide */
.progression-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 0.8em;
}

.progression-dots {
  display: flex;
  gap: 6px;
}

.progression-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #CBD5E0;
}

.progression-dot.dot-bad { background: var(--accent-red); }
.progression-dot.dot-mid { background: var(--accent-amber); }
.progression-dot.dot-good { background: var(--accent-green); }
.progression-dot.dot-active { transform: scale(1.3); }

/* Annotation callouts within prompt blocks */
.prompt-annotation {
  color: var(--accent-cyan);
  font-style: italic;
  font-size: 0.85em;
}

/* Why it's better callouts */
.why-better {
  margin-top: 1em;
}

.why-better h4 {
  color: var(--accent-green);
}

.why-better ul li::before {
  background: var(--accent-green);
}

/* Closing slide */
.closing-slide {
  background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-lighter) 100%);
}

.closing-slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 50% 100%, rgba(78, 205, 196, 0.12) 0%, transparent 60%);
  pointer-events: none;
}

/* ============================================
   RESPONSIVE
   ============================================ */

/* Tablets: 769px - 1024px */

/* Tablets & Large Mobile: max 768px */

/* Mobile: max 480px */

/* Tab structure */
.tab-container {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.tab-buttons {
  display: flex;
  gap: clamp(8px, 1vw, 16px);
  margin-bottom: clamp(16px, 2vh, 24px);
  border-bottom: 2px solid var(--light-text-50);
}

.tab-button {
  padding: clamp(8px, 1.2vh, 12px) clamp(12px, 1.5vw, 20px);
  background: none;
  border: none;
  color: var(--light-text-50);
  cursor: pointer;
  font-size: clamp(0.95rem, 1.2vw, 1.1rem);
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.tab-button:hover {
  color: var(--light-text);
}

.tab-button.active {
  color: var(--accent-cyan);
}

.tab-button.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-cyan);
}

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

/* ============================================
   COPY BUTTON
   ============================================ */
.copy-btn {
  position: absolute;
  top: 8px;
  right: 12px;
  z-index: 5;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(226, 232, 240, 0.15);
  border-radius: 4px;
  color: rgba(226, 232, 240, 0.5);
  font-size: 0.75rem;
  padding: 2px 8px;
  cursor: pointer;
  line-height: 1.6;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  font-family: 'DM Sans', sans-serif;
  user-select: none;
}

.copy-btn:hover {
  background: rgba(78, 205, 196, 0.12);
  border-color: rgba(78, 205, 196, 0.35);
  color: var(--accent-cyan);
}

/* ============================================
   ARROW NAVIGATION BUTTONS
   ============================================ */
.arrow-btn {
  background: none;
  border: none;
  color: var(--light-text);
  font-size: clamp(1rem, 1.5vw, 1.4rem);
  cursor: pointer;
  padding: clamp(6px, 1vh, 10px) clamp(10px, 1.5vw, 16px);
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.arrow-btn:hover {
  color: var(--light-text);
  background: rgba(226, 232, 240, 0.06);
}

.arrow-btn:active { transform: scale(0.95); }

#arrow-prev { margin-right: 8px; }
#arrow-next { margin-left: 8px; }

/* ============================================
   SCRUBBER TIMELINE
   ============================================ */
/* Scrubber — inline inside nav bar, replaces old #progress-track */
.scrubber-container {
  flex: 1;
  margin: 0 16px;
  position: relative;
}

.scrubber-track {
  width: 100%;
  height: 2px;
  background: rgba(226, 232, 240, 0.1);
  border-radius: 2px;
  position: relative;
  cursor: pointer;
}

.scrubber-track:hover { height: 4px; }

.scrubber-progress {
  height: 100%;
  background: var(--accent-cyan);
  border-radius: 2px;
  width: 0%;
  transition: width 0.4s ease;
  pointer-events: none;
}

.scrubber-thumb {
  position: absolute;
  top: 50%;
  left: 0%;
  width: 10px;
  height: 10px;
  background: var(--accent-cyan);
  border: 2px solid rgba(11, 29, 58, 0.9);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  cursor: grab;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 2;
}

.scrubber-container:hover .scrubber-thumb { opacity: 1; }
.scrubber-thumb:active { cursor: grabbing; }

.scrubber-tooltip {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(11, 29, 58, 0.95);
  color: var(--light-text);
  border: 1px solid rgba(78, 205, 196, 0.3);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.scrubber-container:hover .scrubber-tooltip { opacity: 1; }

@media (max-width: 480px) {
  .scrubber-container { margin: 0 8px; }
  .arrow-btn { min-width: 36px; min-height: 36px; padding: 4px 8px; }
}