/* ============================================
   INSTRUCTIONAL TECHNOLOGY PPT STYLES
   Bilingual: Hindi + English
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Devanagari:wght@300;400;500;600;700;800&family=Poppins:wght@300;400;500;600;700;800&family=Playfair+Display:wght@700;800&display=swap');

:root {
  --primary: #1a237e;
  --primary-light: #3949ab;
  --accent: #ff6f00;
  --accent-light: #ffa726;
  --success: #2e7d32;
  --danger: #c62828;
  --purple: #6a1b9a;
  --teal: #00695c;
  --bg-dark: #0d1b2a;
  --bg-slide: #f8f9ff;
  --text-dark: #1a1a2e;
  --text-mid: #37474f;
  --white: #ffffff;
  --gold: #f9a825;
  --font-main: 'Noto Sans Devanagari', 'Poppins', sans-serif;
  --font-display: 'Playfair Display', 'Noto Sans Devanagari', serif;
  --content-size: 25px;
}

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

body {
  font-family: var(--font-main);
  background: #0d1b2a;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

/* ============ SLIDE BASE ============ */
.slide {
  display: none;
  position: absolute;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  padding: 40px 60px 80px 60px;
  overflow: hidden;
  animation: slideIn 0.5s ease;
}

.slide.active { display: flex; flex-direction: column; }

@keyframes slideIn {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ============ SLIDE NUMBER ============ */
.slide-number {
  position: absolute;
  bottom: 55px;
  right: 60px;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  font-family: 'Poppins', sans-serif;
  font-weight: 500;
  background: rgba(0,0,0,0.3);
  padding: 4px 12px;
  border-radius: 20px;
}

/* ============ TITLE SLIDE ============ */
.slide-title {
  background: linear-gradient(135deg, #0d1b2a 0%, #1a237e 40%, #4a148c 100%);
  justify-content: center;
  align-items: center;
  text-align: center;
}

.title-bg-pattern {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(255,111,0,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(106,27,154,0.2) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(57,73,171,0.1) 0%, transparent 70%);
  pointer-events: none;
}

.title-content { position: relative; z-index: 2; max-width: 900px; }

.title-badge {
  display: inline-block;
  background: rgba(255,111,0,0.2);
  border: 1px solid rgba(255,111,0,0.5);
  color: var(--accent-light);
  padding: 6px 20px;
  border-radius: 30px;
  font-size: 16px;
  font-family: 'Poppins', sans-serif;
  margin-bottom: 25px;
  letter-spacing: 1px;
}

.main-title {
  font-family: var(--font-main);
  font-size: 58px;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.2;
  text-shadow: 0 4px 20px rgba(0,0,0,0.5);
  margin-bottom: 10px;
}

.main-subtitle {
  font-size: 36px;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  margin-bottom: 15px;
}

.english-title {
  font-family: 'Poppins', sans-serif;
  font-size: 22px;
  color: var(--accent-light);
  font-style: italic;
  margin-bottom: 25px;
}

.title-divider {
  width: 120px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  margin: 0 auto 25px;
  border-radius: 2px;
}

.title-topics {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.title-topics span {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: white;
  padding: 8px 18px;
  border-radius: 25px;
  font-size: 16px;
  font-family: 'Poppins', sans-serif;
}

/* ============ SECTION HEADER SLIDES ============ */
.slide-section-header {
  background: linear-gradient(135deg, #1a237e 0%, #283593 50%, #1565c0 100%);
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.slide-section-header::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
}

.slide-section-header::after {
  content: '';
  position: absolute;
  bottom: -80px; left: -80px;
  width: 300px; height: 300px;
  border-radius: 50%;
  background: rgba(255,111,0,0.1);
}

.section-number-big {
  font-family: 'Poppins', sans-serif;
  font-size: 140px;
  font-weight: 800;
  color: rgba(255,255,255,0.08);
  position: absolute;
  top: 50%;
  left: 50px;
  transform: translateY(-50%);
  line-height: 1;
  z-index: 1;
}

.section-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}

.section-tag {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 5px 18px;
  border-radius: 20px;
  font-size: 14px;
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.section-content h2 {
  font-size: 46px;
  font-weight: 800;
  color: white;
  margin-bottom: 12px;
  line-height: 1.3;
}

.section-content h3 {
  font-size: 24px;
  color: rgba(255,255,255,0.75);
  font-family: 'Poppins', sans-serif;
  font-weight: 400;
  margin-bottom: 15px;
}

.section-content p {
  font-size: 18px;
  color: var(--accent-light);
  font-family: 'Poppins', sans-serif;
}

/* ============ CONTENT SLIDES ============ */
.slide-content {
  background: var(--bg-slide);
  color: var(--text-dark);
}

.slide-header-bar {
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  margin: -40px -60px 25px -60px;
  padding: 12px 60px;
  display: flex;
  align-items: center;
}

.unit-tag {
  color: rgba(255,255,255,0.9);
  font-size: 14px;
  font-family: 'Poppins', sans-serif;
  font-weight: 500;
  letter-spacing: 1px;
}

.slide-title-text {
  font-size: 30px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 20px;
  font-family: var(--font-main);
  border-left: 5px solid var(--accent);
  padding-left: 15px;
}

/* ============ TOC SLIDE ============ */
.slide-toc {
  background: linear-gradient(135deg, #0d1b2a 0%, #1a237e 100%);
  color: white;
}

.slide-toc .slide-title-text {
  color: white;
  border-left-color: var(--accent);
}

.toc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  flex: 1;
}

.toc-item {
  display: flex;
  align-items: center;
  gap: 15px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  padding: 12px 18px;
  border-radius: 10px;
  font-size: var(--content-size);
  transition: all 0.2s;
}

.toc-item:hover {
  background: rgba(255,111,0,0.15);
  border-color: rgba(255,111,0,0.4);
}

.toc-num {
  font-family: 'Poppins', sans-serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--accent-light);
  min-width: 40px;
}

/* ============ TWO COLUMN LAYOUT ============ */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  flex: 1;
}

.col-box {
  padding: 20px;
  border-radius: 12px;
  font-size: var(--content-size);
}

.col-box h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.col-box p { line-height: 1.6; margin-bottom: 8px; }

.blue-box { background: #e3f2fd; border-left: 5px solid #1565c0; }
.blue-box h3 { color: #1565c0; }
.green-box { background: #e8f5e9; border-left: 5px solid #2e7d32; }
.green-box h3 { color: #2e7d32; }
.orange-box { background: #fff3e0; border-left: 5px solid #e65100; }
.orange-box h3 { color: #e65100; }
.purple-box { background: #f3e5f5; border-left: 5px solid #6a1b9a; }
.purple-box h3 { color: #6a1b9a; }

/* ============ STYLED LIST ============ */
.styled-list {
  list-style: none;
  font-size: var(--content-size);
}

.styled-list li {
  padding: 6px 0;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  line-height: 1.5;
}

/* ============ KEY QUOTE ============ */
.key-quote {
  background: linear-gradient(135deg, #1a237e, #283593);
  color: white;
  padding: 14px 20px;
  border-radius: 10px;
  font-size: 18px;
  text-align: center;
  margin-top: 15px;
  font-style: italic;
}

/* ============ TIMELINE ============ */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.timeline-item {
  display: flex;
  align-items: center;
  gap: 20px;
  background: white;
  border-radius: 10px;
  padding: 12px 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  border-left: 5px solid var(--primary);
}

.timeline-year {
  font-family: 'Poppins', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  min-width: 70px;
}

.timeline-content {
  font-size: var(--content-size);
  color: var(--text-dark);
  line-height: 1.5;
}

/* ============ ORBIT DIAGRAM ============ */
.diagram-box {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.center-circle {
  width: 160px;
  height: 160px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
  font-size: 18px;
  font-weight: 700;
  box-shadow: 0 8px 30px rgba(26,35,126,0.4);
  z-index: 2;
}

.orbit-items {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.orbit-item {
  position: absolute;
  background: white;
  border: 2px solid var(--primary-light);
  border-radius: 12px;
  padding: 12px 18px;
  font-size: 18px;
  font-weight: 600;
  color: var(--primary);
  text-align: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.orbit-item.top { top: 5%; }
.orbit-item.bottom { bottom: 5%; }
.orbit-item.left { left: 5%; }
.orbit-item.right { right: 5%; }

/* ============ POINTS GRID ============ */
.points-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  flex: 1;
}

.point-card {
  padding: 18px;
  border-radius: 12px;
  text-align: center;
  transition: transform 0.2s;
}

.point-card:hover { transform: translateY(-3px); }

.point-icon { font-size: 32px; margin-bottom: 8px; }

.point-card h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.point-card p { font-size: var(--content-size); line-height: 1.4; }

.point-card.purple { background: #f3e5f5; border-top: 4px solid #7b1fa2; }
.point-card.purple h4 { color: #7b1fa2; }
.point-card.blue { background: #e3f2fd; border-top: 4px solid #1565c0; }
.point-card.blue h4 { color: #1565c0; }
.point-card.green { background: #e8f5e9; border-top: 4px solid #2e7d32; }
.point-card.green h4 { color: #2e7d32; }
.point-card.orange { background: #fff3e0; border-top: 4px solid #e65100; }
.point-card.orange h4 { color: #e65100; }
.point-card.red { background: #ffebee; border-top: 4px solid #c62828; }
.point-card.red h4 { color: #c62828; }
.point-card.teal { background: #e0f2f1; border-top: 4px solid #00695c; }
.point-card.teal h4 { color: #00695c; }

/* ============ FLOWCHART ============ */
.flowchart-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.flow-box {
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  min-width: 120px;
}

.flow-arrow {
  font-size: 28px;
  color: var(--primary);
  font-weight: 700;
}

.sender { background: #e3f2fd; border: 2px solid #1565c0; color: #1565c0; }
.encoding { background: #f3e5f5; border: 2px solid #7b1fa2; color: #7b1fa2; }
.channel { background: #fff3e0; border: 2px solid #e65100; color: #e65100; }
.decoding { background: #e8f5e9; border: 2px solid #2e7d32; color: #2e7d32; }
.receiver { background: #fce4ec; border: 2px solid #c62828; color: #c62828; }

.feedback-row {
  display: flex;
  justify-content: center;
  margin: 10px 0;
}

.feedback-box {
  background: linear-gradient(135deg, #1a237e, #283593);
  color: white;
  padding: 12px 30px;
  border-radius: 30px;
  font-size: 18px;
  font-weight: 600;
}

.noise-box {
  background: #ffebee;
  border: 2px dashed #c62828;
  color: #c62828;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 18px;
  text-align: center;
  margin-top: 10px;
}

/* ============ BARRIERS GRID ============ */
.barriers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  flex: 1;
}

.barrier-card {
  background: white;
  border-radius: 12px;
  padding: 18px;
  text-align: center;
  box-shadow: 0 3px 12px rgba(0,0,0,0.08);
  border-bottom: 4px solid var(--danger);
}

.barrier-icon { font-size: 32px; margin-bottom: 8px; }

.barrier-card h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--danger);
  margin-bottom: 8px;
}

.barrier-card p { font-size: var(--content-size); color: var(--text-mid); }

/* ============ MEDIA TREE ============ */
.media-tree {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.tree-root {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  padding: 14px 30px;
  border-radius: 30px;
  font-size: 22px;
  font-weight: 700;
  text-align: center;
}

.tree-branches {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
  width: 100%;
}

.tree-branch {
  border-radius: 12px;
  padding: 15px;
  text-align: center;
}

.tree-branch.blue { background: #e3f2fd; border-top: 4px solid #1565c0; }
.tree-branch.green { background: #e8f5e9; border-top: 4px solid #2e7d32; }
.tree-branch.orange { background: #fff3e0; border-top: 4px solid #e65100; }
.tree-branch.purple { background: #f3e5f5; border-top: 4px solid #7b1fa2; }

.branch-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-dark);
}

.branch-items {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.branch-items span {
  background: rgba(0,0,0,0.08);
  padding: 4px 10px;
  border-radius: 15px;
  font-size: 16px;
}

/* ============ CONE DIAGRAM ============ */
.cone-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.cone-level {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  padding: 8px;
  color: white;
  font-size: 16px;
  font-weight: 600;
  text-align: center;
  transition: all 0.2s;
}

.cone-level:hover { transform: scaleX(1.02); }

.cone-labels {
  display: flex;
  justify-content: space-between;
  width: 100%;
  font-size: 14px;
  color: var(--text-mid);
  font-family: 'Poppins', sans-serif;
  margin-top: 8px;
}

/* ============ IMPACT CHART ============ */
.impact-chart {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.impact-row {
  display: flex;
  align-items: center;
  gap: 15px;
}

.impact-label {
  min-width: 280px;
  font-size: var(--content-size);
  color: var(--text-dark);
  font-weight: 500;
}

.impact-bar {
  height: 36px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 10px;
  color: white;
  font-size: 16px;
  font-weight: 700;
  font-family: 'Poppins', sans-serif;
  transition: width 0.5s ease;
}

/* ============ COMMUNICATION DIAGRAM ============ */
.comm-diagram {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  flex: 1;
}

.comm-type {
  border-radius: 14px;
  padding: 20px;
  text-align: center;
}

.comm-type.verbal { background: #e3f2fd; border: 2px solid #1565c0; }
.comm-type.nonverbal { background: #e8f5e9; border: 2px solid #2e7d32; }
.comm-type.visual { background: #fff3e0; border: 2px solid #e65100; }

.comm-icon { font-size: 36px; margin-bottom: 10px; }

.comm-type h4 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.comm-type ul {
  list-style: none;
  text-align: left;
  font-size: var(--content-size);
}

.comm-type ul li {
  padding: 5px 0;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}

/* ============ VERTICAL FLOWCHART ============ */
.flowchart-vertical {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  flex: 1;
  justify-content: center;
}

.fv-box {
  background: white;
  border: 2px solid var(--primary-light);
  border-radius: 10px;
  padding: 14px 30px;
  font-size: var(--content-size);
  width: 80%;
  text-align: center;
  box-shadow: 0 3px 10px rgba(0,0,0,0.08);
}

.fv-arrow {
  font-size: 24px;
  color: var(--accent);
  font-weight: 700;
}

/* ============ CLASSIFICATION CHART ============ */
.classification-chart {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.class-root {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  padding: 14px 30px;
  border-radius: 30px;
  font-size: 22px;
  font-weight: 700;
  text-align: center;
}

.class-branches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  width: 100%;
}

.class-branch {
  border-radius: 12px;
  padding: 18px;
}

.class-branch.projected { background: #e3f2fd; border: 2px solid #1565c0; }
.class-branch.nonprojected { background: #e8f5e9; border: 2px solid #2e7d32; }

.class-branch h4 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-dark);
  text-align: center;
}

.class-items { display: flex; flex-direction: column; gap: 8px; }

.class-item {
  background: white;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: var(--content-size);
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

/* ============ AIDS TABLE ============ */
.aids-table {
  flex: 1;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.aids-header {
  display: grid;
  grid-template-columns: 1fr 2fr 2fr;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  color: white;
  padding: 14px 20px;
  font-size: 18px;
  font-weight: 700;
  gap: 15px;
}

.aids-row {
  display: grid;
  grid-template-columns: 1fr 2fr 2fr;
  padding: 12px 20px;
  font-size: var(--content-size);
  gap: 15px;
  border-bottom: 1px solid #e0e0e0;
  background: white;
  align-items: center;
}

.aids-row:nth-child(even) { background: #f5f5f5; }

/* ============ LCD DIAGRAM ============ */
.lcd-diagram {
  background: #e3f2fd;
  border-radius: 12px;
  padding: 20px;
}

.lcd-parts {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.lcd-part {
  background: white;
  border: 2px solid #1565c0;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  color: #1565c0;
  min-width: 110px;
}

.lcd-arrow {
  font-size: 24px;
  color: var(--accent);
  font-weight: 700;
}

/* ============ SMART BOARD FEATURES ============ */
.smartboard-features {
  flex: 1;
  display: flex;
  gap: 30px;
  align-items: center;
}

.sb-center {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 8px 30px rgba(26,35,126,0.4);
}

.sb-icon { font-size: 36px; margin-bottom: 5px; }

.sb-features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  flex: 1;
}

.sb-feature {
  background: white;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  padding: 12px;
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: all 0.2s;
}

.sb-feature:hover {
  border-color: var(--primary);
  background: #e3f2fd;
  transform: translateY(-2px);
}

/* ============ APP FLOWCHART ============ */
.app-flowchart {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 15px;
}

.app-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}

.app-box {
  background: white;
  border: 2px solid var(--primary-light);
  border-radius: 10px;
  padding: 14px;
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  color: var(--primary);
  box-shadow: 0 3px 10px rgba(0,0,0,0.08);
}

.advantages-box {
  background: #e8f5e9;
  border-radius: 10px;
  padding: 15px 20px;
}

.advantages-box h4 {
  font-size: 18px;
  font-weight: 700;
  color: #2e7d32;
  margin-bottom: 10px;
}

.adv-items {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.adv-items span {
  background: white;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 16px;
  color: #2e7d32;
  font-weight: 500;
}

/* ============ COMPARISON TABLE ============ */
.comparison-table {
  flex: 1;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.comp-header {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1.5fr;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  color: white;
  padding: 14px 20px;
  font-size: 18px;
  font-weight: 700;
  gap: 15px;
}

.comp-row {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1.5fr;
  padding: 12px 20px;
  font-size: var(--content-size);
  gap: 15px;
  border-bottom: 1px solid #e0e0e0;
  background: white;
  align-items: center;
}

.comp-row:nth-child(even) { background: #f5f5f5; }

.good { color: #2e7d32; font-weight: 600; }
.bad { color: #c62828; font-weight: 600; }

/* ============ MICRO TEACHING ============ */
.definition-box-large {
  background: linear-gradient(135deg, #e3f2fd, #bbdefb);
  border-left: 6px solid var(--primary);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.def-icon { font-size: 48px; }

.def-text p {
  font-size: var(--content-size);
  line-height: 1.6;
  color: var(--text-dark);
}

.micro-features {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.mf-item {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 18px;
  font-weight: 600;
  text-align: center;
}

/* ============ CYCLE DIAGRAM ============ */
.cycle-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex: 1;
  flex-wrap: wrap;
}

.cycle-step {
  background: white;
  border-radius: 12px;
  padding: 15px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  min-width: 130px;
  border-bottom: 4px solid var(--primary);
}

.step-num {
  font-family: 'Poppins', sans-serif;
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 5px;
}

.step-content {
  font-size: 17px;
  color: var(--text-dark);
  line-height: 1.4;
}

.cycle-arrow {
  font-size: 28px;
  color: var(--accent);
  font-weight: 700;
}

.step1 { border-bottom-color: #1565c0; }
.step2 { border-bottom-color: #2e7d32; }
.step3 { border-bottom-color: #e65100; }
.step4 { border-bottom-color: #7b1fa2; }
.step5 { border-bottom-color: #c62828; }

/* ============ SKILLS GRID ============ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  flex: 1;
}

.skill-card {
  background: white;
  border-radius: 10px;
  padding: 15px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.08);
  border-top: 4px solid var(--primary);
  text-align: center;
}

.skill-num {
  font-family: 'Poppins', sans-serif;
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
}

.skill-card h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.skill-card p { font-size: 16px; color: var(--text-mid); }

/* ============ PRACTICE FLOWCHART ============ */
.practice-flowchart {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  flex: 1;
  justify-content: center;
}

.pf-step {
  display: flex;
  align-items: center;
  gap: 15px;
  background: white;
  border-radius: 10px;
  padding: 12px 20px;
  width: 85%;
  box-shadow: 0 3px 10px rgba(0,0,0,0.08);
  border-left: 5px solid var(--primary);
}

.pf-icon { font-size: 28px; }

.pf-text {
  font-size: var(--content-size);
  color: var(--text-dark);
  line-height: 1.4;
}

.pf-arrow {
  font-size: 22px;
  color: var(--accent);
  font-weight: 700;
}

/* ============ EVAL TABLE ============ */
.eval-table {
  flex: 1;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.eval-header {
  display: grid;
  grid-template-columns: 2fr 2fr 1fr;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  color: white;
  padding: 14px 20px;
  font-size: 18px;
  font-weight: 700;
  gap: 15px;
}

.eval-row {
  display: grid;
  grid-template-columns: 2fr 2fr 1fr;
  padding: 12px 20px;
  font-size: var(--content-size);
  gap: 15px;
  border-bottom: 1px solid #e0e0e0;
  background: white;
  align-items: center;
}

.eval-row:nth-child(even) { background: #f5f5f5; }
.total-row { background: #e3f2fd !important; font-weight: 700; }

/* ============ ADV/DISADV ============ */
.adv-disadv {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  flex: 1;
}

.adv-col, .disadv-col {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 3px 12px rgba(0,0,0,0.08);
}

.adv-col h3, .disadv-col h3 {
  font-size: 20px;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid #e0e0e0;
}

.adv-item, .disadv-item {
  padding: 10px 12px;
  margin-bottom: 8px;
  border-radius: 8px;
  font-size: var(--content-size);
}

.adv-item { background: #e8f5e9; color: #2e7d32; }
.disadv-item { background: #ffebee; color: #c62828; }

/* ============ BOARDS GRID ============ */
.boards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  flex: 1;
}

.board-card {
  border-radius: 12px;
  padding: 18px;
  text-align: center;
  box-shadow: 0 3px 12px rgba(0,0,0,0.08);
}

.board-icon { font-size: 32px; margin-bottom: 8px; }

.board-card h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.board-card p { font-size: var(--content-size); }

.board-card.black { background: #f5f5f5; border-top: 4px solid #212121; }
.board-card.black h4 { color: #212121; }
.board-card.white { background: #fafafa; border-top: 4px solid #1565c0; }
.board-card.white h4 { color: #1565c0; }
.board-card.bulletin { background: #fff3e0; border-top: 4px solid #e65100; }
.board-card.bulletin h4 { color: #e65100; }
.board-card.flannel { background: #f3e5f5; border-top: 4px solid #7b1fa2; }
.board-card.flannel h4 { color: #7b1fa2; }
.board-card.magnetic { background: #e8f5e9; border-top: 4px solid #2e7d32; }
.board-card.magnetic h4 { color: #2e7d32; }
.board-card.digital { background: #e3f2fd; border-top: 4px solid #1565c0; }
.board-card.digital h4 { color: #1565c0; }

/* ============ ROLE DIAGRAM ============ */
.role-diagram {
  flex: 1;
  display: flex;
  gap: 30px;
  align-items: center;
  justify-content: center;
}

.role-center {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 8px 30px rgba(26,35,126,0.4);
}

.role-items {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  flex: 1;
}

.role-item {
  background: white;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  padding: 12px;
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

/* ============ EFFECTIVE STEPS ============ */
.effective-steps {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.es-item {
  display: flex;
  align-items: center;
  gap: 20px;
  background: white;
  border-radius: 10px;
  padding: 14px 20px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.08);
}

.es-num {
  font-family: 'Poppins', sans-serif;
  font-size: 24px;
  font-weight: 800;
  color: white;
  background: var(--primary);
  width: 45px;
  height: 45px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.es-text {
  font-size: var(--content-size);
  color: var(--text-dark);
  line-height: 1.4;
}

/* ============ SUMMARY GRID ============ */
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  flex: 1;
}

.sum-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: white;
  border-radius: 8px;
  padding: 10px 15px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  font-size: 18px;
}

.sum-num {
  font-family: 'Poppins', sans-serif;
  font-size: 18px;
  font-weight: 800;
  color: var(--accent);
  min-width: 35px;
}

/* ============ QUESTIONS LIST ============ */
.questions-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.q-item {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  background: white;
  border-radius: 10px;
  padding: 12px 18px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  border-left: 4px solid var(--primary);
  font-size: var(--content-size);
}

.q-num {
  font-family: 'Poppins', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: white;
  background: var(--primary);
  padding: 3px 10px;
  border-radius: 15px;
  white-space: nowrap;
}

/* ============ REFERENCES ============ */
.references-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.ref-item {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  background: white;
  border-radius: 10px;
  padding: 12px 18px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  font-size: 18px;
}

.ref-num {
  font-family: 'Poppins', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: white;
  background: var(--accent);
  padding: 3px 10px;
  border-radius: 15px;
  white-space: nowrap;
}

/* ============ THANK YOU SLIDE ============ */
.slide-thankyou {
  background: linear-gradient(135deg, #0d1b2a 0%, #1a237e 40%, #4a148c 80%, #880e4f 100%);
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.ty-bg-pattern {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    radial-gradient(circle at 15% 15%, rgba(255,111,0,0.2) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(136,14,79,0.3) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(57,73,171,0.15) 0%, transparent 60%);
  pointer-events: none;
}

.ty-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.ty-icon { font-size: 80px; margin-bottom: 15px; animation: pulse 2s infinite; }

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.ty-hindi {
  font-family: var(--font-main);
  font-size: 80px;
  font-weight: 800;
  color: white;
  text-shadow: 0 4px 20px rgba(0,0,0,0.5);
  margin-bottom: 5px;
}

.ty-english {
  font-family: 'Poppins', sans-serif;
  font-size: 42px;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 20px;
}

.ty-divider {
  width: 150px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light), white);
  margin: 0 auto 20px;
  border-radius: 2px;
}

.ty-quote {
  font-size: 18px;
  color: rgba(255,255,255,0.85);
  line-height: 1.7;
  margin-bottom: 25px;
  font-style: italic;
  background: rgba(255,255,255,0.08);
  padding: 15px 25px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.15);
}

.ty-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.ty-detail {
  color: rgba(255,255,255,0.8);
  font-size: 18px;
  font-family: 'Poppins', sans-serif;
}

.ty-topics {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.ty-topics span {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: white;
  padding: 8px 18px;
  border-radius: 25px;
  font-size: 16px;
  font-family: 'Poppins', sans-serif;
  font-weight: 500;
}

/* ============ NAVIGATION ============ */
.nav-controls {
  position: fixed;
  bottom: 15px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 20px;
  z-index: 1000;
  background: rgba(13,27,42,0.9);
  padding: 10px 25px;
  border-radius: 40px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.1);
}

.nav-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  border: none;
  padding: 10px 22px;
  border-radius: 25px;
  font-size: 16px;
  font-family: var(--font-main);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-btn:hover {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  transform: scale(1.05);
}

.nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

.slide-counter {
  font-family: 'Poppins', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: white;
  min-width: 70px;
  text-align: center;
}

/* ============ PROGRESS BAR ============ */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: rgba(255,255,255,0.1);
  z-index: 1000;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  transition: width 0.4s ease;
  border-radius: 0 3px 3px 0;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  :root { --content-size: 20px; }
  .slide { padding: 30px 40px 70px 40px; }
  .main-title { font-size: 42px; }
  .points-grid { grid-template-columns: repeat(2, 1fr); }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .sb-features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --content-size: 18px; }
  .slide { padding: 20px 25px 65px 25px; }
  .two-col { grid-template-columns: 1fr; }
  .tree-branches { grid-template-columns: repeat(2, 1fr); }
  .toc-grid { grid-template-columns: 1fr; }
  .main-title { font-size: 32px; }
  .section-content h2 { font-size: 30px; }
}