/* ============================================
   LIFESPAN DEVELOPMENT PRESENTATION
   Design: Indigo Ink × Copper & Slate
   Fonts: Cormorant Garamond + Manrope
   ============================================ */

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

:root {
  --indigo-deep:   #1B0A3C;
  --indigo-mid:    #3D1E7C;
  --indigo-light:  #7B68EE;
  --indigo-pale:   #E8E0F0;
  --copper:        #B87333;
  --copper-light:  #D4A574;
  --slate-dark:    #2F3640;
  --slate-light:   #F5F0EB;
  --white:         #FFFFFF;
  --text-dark:     #1A1020;
  --text-mid:      #4A3F5C;
  --text-light:    #9B8FB0;

  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'Manrope', system-ui, sans-serif;

  --slide-w: 100vw;
  --slide-h: 100vh;
  --radius:  12px;
  --transition: 0.55s cubic-bezier(0.77, 0, 0.175, 1);
}

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--indigo-deep);
  font-family: var(--font-body);
}

/* ── SLIDE BASE ─────────────────────────────── */
.slide {
  position: absolute;
  inset: 0;
  width: var(--slide-w);
  height: var(--slide-h);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateX(60px) scale(0.97);
  transition: opacity var(--transition), transform var(--transition);
  pointer-events: none;
  overflow: hidden;
}

.slide.active {
  opacity: 1;
  transform: translateX(0) scale(1);
  pointer-events: all;
}

.slide.exit-left {
  opacity: 0;
  transform: translateX(-60px) scale(0.97);
}

/* ── SLIDE THEMES ───────────────────────────── */
.slide--title      { background: linear-gradient(135deg, var(--indigo-deep) 0%, #2A0E5C 60%, #1B0A3C 100%); }
.slide--dark       { background: linear-gradient(135deg, var(--slate-dark) 0%, #1E2530 100%); }
.slide--light      { background: linear-gradient(135deg, var(--slate-light) 0%, #EDE8F5 100%); }
.slide--accent     { background: linear-gradient(135deg, #F5F0EB 0%, #EDE4F8 100%); }
.slide--conclusion { background: linear-gradient(135deg, var(--indigo-deep) 0%, #2A0E5C 60%, #1B0A3C 100%); }

/* ── SLIDE NUMBER ───────────────────────────── */
.slide__number {
  position: absolute;
  top: 32px; right: 48px;
  font-family: var(--font-display);
  font-size: 5rem;
  font-weight: 300;
  line-height: 1;
  opacity: 0.08;
  color: var(--indigo-light);
  pointer-events: none;
  user-select: none;
}
.slide--dark .slide__number  { color: var(--white); opacity: 0.06; }
.slide--light .slide__number { color: var(--indigo-mid); opacity: 0.1; }
.slide--accent .slide__number{ color: var(--indigo-mid); opacity: 0.1; }

/* ── ACCENT BAR ─────────────────────────────── */
.slide__accent-bar {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 6px;
  background: linear-gradient(180deg, var(--copper) 0%, var(--indigo-light) 100%);
}

/* ── DECORATIVE CIRCLES ─────────────────────── */
.slide__deco-circle {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}
.c1 {
  width: 500px; height: 500px;
  right: -120px; bottom: -120px;
  background: radial-gradient(circle, rgba(123,104,238,0.15) 0%, transparent 70%);
}
.c2 {
  width: 300px; height: 300px;
  left: 80px; top: -80px;
  background: radial-gradient(circle, rgba(184,115,51,0.12) 0%, transparent 70%);
}

/* ── BG PATTERN ─────────────────────────────── */
.slide__bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(123,104,238,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(184,115,51,0.06) 0%, transparent 50%);
  pointer-events: none;
}

/* ── INNER LAYOUT ───────────────────────────── */
.slide__inner {
  width: 100%;
  max-width: 1200px;
  padding: 60px 80px;
  position: relative;
  z-index: 2;
}

.slide__inner.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

/* ── TYPOGRAPHY ─────────────────────────────── */
.section-label {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 12px;
}

h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 600;
  line-height: 1.15;
  color: var(--text-dark);
  margin-bottom: 24px;
}
h2 em { color: var(--indigo-mid); font-style: italic; }

.slide--dark h2       { color: var(--white); }
.slide--dark h2 em    { color: var(--copper-light); }
.slide--conclusion h2 { color: var(--white); }
.slide--conclusion h2 em { color: var(--copper-light); }

.body-text {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-mid);
  margin-bottom: 16px;
}
.slide--dark .body-text { color: rgba(255,255,255,0.75); }

.center-text { text-align: center; max-width: 700px; margin: 0 auto 28px; }

/* ── TITLE SLIDE ────────────────────────────── */
.title-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 60px;
}

.title-tag {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 24px;
}

.title-main {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 7rem);
  font-weight: 300;
  line-height: 1.05;
  color: var(--white);
  margin-bottom: 32px;
}
.title-main em {
  font-style: italic;
  color: var(--copper-light);
}

.title-divider {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, var(--copper), var(--indigo-light));
  margin: 0 auto 36px;
}

.title-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
}

.meta-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.meta-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--copper);
}

.meta-value {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--white);
}

.meta-sep {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,0.2);
}

/* ── OVERVIEW GRID ──────────────────────────── */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 8px;
}

.ov-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 20px 16px;
  transition: background 0.3s, border-color 0.3s;
}
.ov-card:hover {
  background: rgba(123,104,238,0.15);
  border-color: rgba(123,104,238,0.4);
}

.ov-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 300;
  color: var(--copper-light);
  margin-bottom: 8px;
}

.ov-card p {
  font-size: 0.82rem;
  font-weight: 500;
  color: rgba(255,255,255,0.8);
  line-height: 1.4;
}

/* ── LIFECYCLE VISUAL ───────────────────────── */
.lifecycle-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.lc-stage {
  background: var(--c);
  color: white;
  padding: 10px 28px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  width: 160px;
  text-align: center;
  opacity: 0.9;
}

.lc-arrow {
  color: var(--text-light);
  font-size: 1.2rem;
}

/* ── HIGHLIGHT BOX ──────────────────────────── */
.highlight-box {
  background: linear-gradient(135deg, rgba(123,104,238,0.1), rgba(184,115,51,0.08));
  border-left: 3px solid var(--copper);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 16px 20px;
  margin-top: 20px;
}
.highlight-box span {
  font-family: var(--font-display);
  font-size: 1rem;
  font-style: italic;
  color: var(--text-mid);
  line-height: 1.6;
}

/* ── DOMAINS GRID ───────────────────────────── */
.domains-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 8px;
}

.domain-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: 0 4px 24px rgba(61,30,124,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}
.domain-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(61,30,124,0.18);
}

.domain-icon {
  width: 48px; height: 48px;
  margin-bottom: 16px;
}
.domain--physical  .domain-icon { color: var(--indigo-mid); }
.domain--cognitive .domain-icon { color: var(--copper); }
.domain--psychosocial .domain-icon { color: #5B3A8C; }

.domain-card h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.domain-card p {
  font-size: 0.82rem;
  color: var(--text-mid);
  line-height: 1.6;
  margin-bottom: 14px;
}

.domain-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.domain-card ul li {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--indigo-mid);
  padding-left: 14px;
  position: relative;
}
.domain-card ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--copper);
}

/* ── STAT BLOCKS ────────────────────────────── */
.stat-blocks {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.stat-b {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--copper-light);
}

.stat-lbl {
  font-size: 0.8rem;
  font-weight: 500;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.05em;
}

/* ── FACT LIST ──────────────────────────────── */
.fact-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 20px;
}

.fact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.fact-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--copper);
  margin-top: 6px;
  flex-shrink: 0;
}

.fact-item span:last-child {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.5;
}

/* ── PIAGET GRID ────────────────────────────── */
.piaget-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 8px;
}

.piaget-stage {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px 20px;
  border-top: 4px solid var(--indigo-mid);
  box-shadow: 0 4px 20px rgba(61,30,124,0.08);
  transition: transform 0.3s;
}
.piaget-stage:nth-child(2) { border-top-color: var(--copper); }
.piaget-stage:nth-child(3) { border-top-color: #5B3A8C; }
.piaget-stage:nth-child(4) { border-top-color: var(--indigo-light); }
.piaget-stage:hover { transform: translateY(-4px); }

.ps-age {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--copper);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.ps-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.ps-desc {
  font-size: 0.8rem;
  color: var(--text-mid);
  line-height: 1.55;
}

.theorist-credit {
  text-align: center;
  margin-top: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-light);
}

/* ── ERIKSON TABLE ──────────────────────────── */
.erikson-table {
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 8px;
}

.et-row {
  display: grid;
  grid-template-columns: 50px 80px 1fr 120px;
  gap: 0;
}

.et-header {
  background: var(--indigo-mid);
  padding: 12px 16px;
}
.et-header span {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.8);
}

.et-row:not(.et-header) {
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 10px 16px;
  transition: background 0.2s;
}
.et-row:not(.et-header):hover { background: rgba(123,104,238,0.12); }

.et-row:not(.et-header) span {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.8);
  display: flex;
  align-items: center;
}

.highlight-row {
  background: rgba(184,115,51,0.15) !important;
  border-left: 3px solid var(--copper) !important;
}
.highlight-row span { color: var(--copper-light) !important; font-weight: 600; }

/* ── DEBATE SPLIT ───────────────────────────── */
.debate-split {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
  margin: 24px 0;
}

.debate-side {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
}

.ds-icon { font-size: 2.5rem; margin-bottom: 12px; }

.debate-side h3 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 12px;
}

.debate-side p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.6;
  margin-bottom: 16px;
}

.ds-examples {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.ds-examples span {
  background: rgba(123,104,238,0.2);
  border: 1px solid rgba(123,104,238,0.3);
  border-radius: 50px;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--indigo-pale);
}

.nature .ds-examples span { background: rgba(184,115,51,0.2); border-color: rgba(184,115,51,0.3); color: var(--copper-light); }

.debate-vs {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--copper);
  text-align: center;
}

.debate-conclusion {
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.6;
  text-align: center;
}
.debate-conclusion strong { color: var(--copper-light); }

/* ── COMPARE CARDS ──────────────────────────── */
.compare-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}

.cc-card {
  border-radius: var(--radius);
  padding: 20px;
}
.cc-cont { background: rgba(61,30,124,0.08); border: 1px solid rgba(61,30,124,0.2); }
.cc-disc { background: rgba(184,115,51,0.08); border: 1px solid rgba(184,115,51,0.2); }

.cc-card h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 8px;
}
.cc-disc h4 { color: var(--copper); }
.cc-cont h4 { color: var(--indigo-mid); }

.cc-card p {
  font-size: 0.78rem;
  color: var(--text-mid);
  line-height: 1.5;
  margin-bottom: 12px;
}

.cc-visual { height: 40px; position: relative; }

.slope-line {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--indigo-mid), var(--indigo-light));
  transform: rotate(-8deg);
  transform-origin: left bottom;
  border-radius: 2px;
}

.steps-visual {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 100%;
}
.step {
  background: var(--copper);
  border-radius: 2px 2px 0 0;
  flex: 1;
  opacity: 0.7;
}
.s1 { height: 25%; }
.s2 { height: 50%; }
.s3 { height: 75%; }
.s4 { height: 100%; }

/* ── QUOTE BLOCK ────────────────────────────── */
.quote-block {
  background: linear-gradient(135deg, rgba(61,30,124,0.08), rgba(184,115,51,0.06));
  border-radius: var(--radius);
  padding: 36px 32px;
  border: 1px solid rgba(61,30,124,0.15);
}

blockquote {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-dark);
  line-height: 1.7;
  margin-bottom: 16px;
}

cite {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--copper);
  text-transform: uppercase;
}

/* ── STAGES TIMELINE ────────────────────────── */
.stages-timeline {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 12px;
  margin-top: 16px;
  position: relative;
}

.stages-timeline::before {
  content: '';
  position: absolute;
  top: 16px;
  left: 16px; right: 16px;
  height: 2px;
  background: linear-gradient(90deg, var(--indigo-mid), var(--copper), var(--indigo-light));
  z-index: 0;
}

.st-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.st-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--copper);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 2px var(--copper);
  flex-shrink: 0;
}

.st-content {
  text-align: center;
}

.st-age {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--copper);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.st-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
  line-height: 1.3;
}

.st-desc {
  font-size: 0.7rem;
  color: var(--text-mid);
  line-height: 1.4;
}

/* ── THEORISTS GRID ─────────────────────────── */
.theorists-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 8px;
}

.th-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: background 0.3s, border-color 0.3s;
}
.th-card:hover {
  background: rgba(123,104,238,0.12);
  border-color: rgba(123,104,238,0.3);
}

.th-initial {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--indigo-mid), var(--copper));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
  flex-shrink: 0;
}

.th-info h4 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 4px;
}

.th-theory {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--copper-light);
  margin-bottom: 8px;
}

.th-info p {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.5;
}

/* ── CONCLUSION ─────────────────────────────── */
.conclusion-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 60px;
  text-align: center;
}

.takeaways-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 28px 0 40px;
  text-align: left;
}

.ta-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.ta-num {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--copper-light);
  flex-shrink: 0;
  line-height: 1;
  margin-top: 2px;
}

.ta-item p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.82);
  line-height: 1.55;
}

.conclusion-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.12);
}

.cf-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--white);
}

.cf-roll, .cf-subject {
  font-size: 0.8rem;
  font-weight: 500;
  color: rgba(255,255,255,0.55);
}

.cf-sep {
  color: var(--copper);
  font-size: 1rem;
}

/* ── NAVIGATION ─────────────────────────────── */
.nav-controls {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 16px;
  background: rgba(27,10,60,0.85);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 50px;
  padding: 10px 20px;
  z-index: 100;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.nav-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.06);
  color: var(--white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
}
.nav-btn:hover:not(:disabled) {
  background: rgba(123,104,238,0.3);
  border-color: rgba(123,104,238,0.5);
}
.nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.nav-btn svg { width: 18px; height: 18px; }

.slide-counter {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--white);
  min-width: 48px;
  text-align: center;
}

.counter-sep { color: rgba(255,255,255,0.3); margin: 0 2px; }

/* ── SLIDE DOTS ─────────────────────────────── */
.slide-dots {
  position: fixed;
  right: 28px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 100;
}

.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.25);
  cursor: pointer;
  transition: background 0.3s, transform 0.3s;
}
.dot.active {
  background: var(--copper);
  transform: scale(1.4);
}
.dot:hover { background: rgba(255,255,255,0.6); }

/* ── KEYBOARD HINT ──────────────────────────── */
.keyboard-hint {
  position: fixed;
  bottom: 32px;
  right: 48px;
  font-size: 0.65rem;
  font-weight: 500;
  color: rgba(255,255,255,0.3);
  letter-spacing: 0.08em;
  z-index: 100;
}

/* ── RESPONSIVE ─────────────────────────────── */
@media (max-width: 1024px) {
  .slide__inner { padding: 40px 48px; }
  .overview-grid { grid-template-columns: repeat(2, 1fr); }
  .piaget-grid { grid-template-columns: repeat(2, 1fr); }
  .stages-timeline { grid-template-columns: repeat(4, 1fr); }
  .stages-timeline::before { display: none; }
  .theorists-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .slide__inner.two-col { grid-template-columns: 1fr; gap: 32px; }
  .domains-grid { grid-template-columns: 1fr; }
  .debate-split { grid-template-columns: 1fr; }
  .debate-vs { display: none; }
  .title-main { font-size: 3.5rem; }
}