/* ==========================================================================
   Episode 10: Building an AI Data Center — Compute, Network, Storage & Power
   Design Theme: Obsidian Industrial & Thermodynamic Luminescence
   ========================================================================== */

:root {
  --bg-dark: #07090e;
  --bg-surface: #0e121d;
  --bg-surface-elevated: #151b2b;
  --bg-glass: rgba(17, 24, 39, 0.75);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(6, 182, 212, 0.5);

  --accent-gold: #f59e0b;
  --accent-gold-glow: rgba(245, 158, 11, 0.25);
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.25);
  --accent-red: #ef4444;
  --accent-red-glow: rgba(239, 68, 68, 0.25);
  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.25);
  --accent-purple: #8b5cf6;
  --accent-purple-glow: rgba(139, 92, 246, 0.25);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-sans);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  -webkit-font-smoothing: antialiased;
}

/* App Container */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: relative;
  background: radial-gradient(circle at 50% -20%, rgba(6, 182, 212, 0.12), transparent 60%),
              radial-gradient(circle at 100% 100%, rgba(245, 158, 11, 0.08), transparent 50%),
              #07090e;
}

/* ==========================================================================
   TOP NAVIGATION
   ========================================================================== */
.top-nav {
  height: 64px;
  background: rgba(14, 18, 29, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 100;
}

.nav-left, .nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.back-hub-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.back-hub-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--border-focus);
  transform: translateX(-2px);
}

.series-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-gold);
  background: var(--accent-gold-glow);
  padding: 6px 12px;
  border-radius: 20px;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-gold);
  box-shadow: 0 0 10px var(--accent-gold);
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.current-slide-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.hud-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hud-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.hud-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.hud-btn.active {
  background: rgba(6, 182, 212, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.slide-counter-badge {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--bg-surface-elevated);
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
}

.slide-counter-badge span {
  color: var(--text-primary);
}

/* ==========================================================================
   SLIDE VIEWPORT & BASE SLIDES
   ========================================================================== */
.slide-viewport {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 28px 48px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
}

.slide.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.slide-inner {
  max-width: 1360px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* Common Slide Headers */
.hero-pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.finale-pill {
  color: var(--accent-gold);
  background: var(--accent-gold-glow);
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.complete-pill {
  color: var(--accent-cyan);
  background: var(--accent-cyan-glow);
  border: 1px solid rgba(6, 182, 212, 0.4);
}

.glitch-title {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 8px;
}

.hero-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.gold-gradient {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cyan-gradient {
  background: linear-gradient(135deg, #06b6d4, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.emerald-gradient {
  background: linear-gradient(135deg, #10b981, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-tag-row {
  display: flex;
  gap: 10px;
  margin-bottom: 8px;
}

.section-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.badge-compute { background: rgba(59, 130, 246, 0.18); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.3); }
.badge-network { background: rgba(6, 182, 212, 0.18); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.3); }
.badge-storage { background: rgba(16, 185, 129, 0.18); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-gold { background: rgba(245, 158, 11, 0.18); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-red { background: rgba(239, 68, 68, 0.18); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.3); }
.badge-cyan { background: rgba(6, 182, 212, 0.18); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.3); }

.slide h2 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.slide-desc {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 20px;
}

/* ==========================================================================
   SLIDE 1: GIGAFACTORY HERO
   ========================================================================== */
.gigafactory-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 24px;
  flex: 1;
}

.campus-stat-panel, .pillars-reactor-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.panel-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
  align-self: flex-start;
}

.megawatt-badge {
  background: var(--accent-gold-glow);
  color: var(--accent-gold);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.core-badge {
  background: var(--accent-cyan-glow);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.stat-items-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 16px;
}

.stat-item-row {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 14px 16px;
  transition: var(--transition-smooth);
}

.stat-item-row:hover {
  border-color: var(--border-focus);
  transform: translateX(4px);
}

.si-icon {
  font-size: 24px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
}

.si-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.si-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.si-val {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
}

.si-sub {
  font-size: 12px;
  color: var(--text-secondary);
}

/* 4 Pillars Grid */
.four-pillars-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 18px 0;
  flex: 1;
}

.pillar-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.pillar-box:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.p-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  opacity: 0.6;
}

.pillar-box h4 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

.pillar-box p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.p-compute { border-left: 3px solid #60a5fa; }
.p-network { border-left: 3px solid #22d3ee; }
.p-storage { border-left: 3px solid #34d399; }
.p-power { border-left: 3px solid #f59e0b; }

.quote-banner {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-secondary);
  font-style: italic;
}

/* Color Helpers */
.text-gold { color: var(--accent-gold); }
.text-cyan { color: var(--accent-cyan); }
.text-red { color: var(--accent-red); }
.text-emerald { color: var(--accent-emerald); }
.text-purple { color: var(--accent-purple); }
.text-amber { color: #f59e0b; }

/* ==========================================================================
   SLIDE 2: COMPUTE DENSITY & FAT-TREE FABRIC
   ========================================================================== */
.density-fabric-stage {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 24px;
  flex: 1;
}

.density-card, .fabric-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 22px;
  display: flex;
  flex-direction: column;
}

.card-header-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.ch-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.cyan-bg { background: var(--accent-cyan-glow); color: var(--accent-cyan); border: 1px solid rgba(6, 182, 212, 0.3); }
.red-bg { background: var(--accent-red-glow); color: var(--accent-red); border: 1px solid rgba(239, 68, 68, 0.3); }
.gold-bg { background: var(--accent-gold-glow); color: var(--accent-gold); border: 1px solid rgba(245, 158, 11, 0.3); }

.rack-compare-visual {
  display: flex;
  align-items: stretch;
  gap: 16px;
  flex: 1;
}

.rack-spec-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 14px;
}

.rack-diagram {
  border: 2px dashed rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.rack-chassis-slot {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  padding: 6px 8px;
  font-size: 11px;
  font-family: var(--font-mono);
  text-align: center;
}

.gb200-slot {
  background: rgba(6, 182, 212, 0.15);
  border-color: rgba(6, 182, 212, 0.4);
  color: var(--accent-cyan);
}

.nvlink-slot {
  background: rgba(245, 158, 11, 0.15);
  border-color: rgba(245, 158, 11, 0.4);
  color: var(--accent-gold);
}

.power-slot {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.4);
  color: var(--accent-red);
}

.air-fan-icon, .liquid-loop-icon {
  text-align: center;
  font-size: 11px;
  font-weight: 700;
  padding-top: 4px;
}

.air-fan-icon { color: var(--text-muted); }
.liquid-loop-icon { color: var(--accent-cyan); }

.rack-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 12px;
}

.rd-item {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  padding-bottom: 4px;
}

.rack-divider-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 800;
  color: var(--text-muted);
  font-size: 13px;
}

/* Fat-Tree Architecture Visual */
.fat-tree-diagram {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.tier-level {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 10px 14px;
}

.tier-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.switch-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.sw-box {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  padding: 8px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
}

.super-sw { border-color: rgba(139, 92, 246, 0.4); color: #c084fc; }
.spine-sw { border-color: rgba(6, 182, 212, 0.4); color: #38bdf8; }

.node-rails-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.rail-box {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 6px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 11px;
  font-family: var(--font-mono);
}

.rail-box strong { color: var(--accent-emerald); }

.fabric-links-inter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 2px 0;
}

.flow-line {
  flex: 1;
  height: 2px;
}

.cyan-flow { background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent); }
.green-flow { background: linear-gradient(90deg, transparent, var(--accent-emerald), transparent); }

.bw-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--accent-cyan);
  background: var(--bg-surface-elevated);
  padding: 2px 8px;
  border-radius: 10px;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.fabric-footer-note {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 12px;
  color: var(--text-secondary);
}

.ffn-tag {
  font-family: var(--font-mono);
  font-weight: 800;
  color: var(--accent-emerald);
  font-size: 10px;
}

/* ==========================================================================
   SLIDE 3: STORAGE TIER & CHECKPOINT WALL
   ========================================================================== */
.storage-architecture-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 24px;
  flex: 1;
}

.storage-pyramid-card, .checkpoint-wall-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 22px;
  display: flex;
  flex-direction: column;
}

.storage-tiers-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.st-level {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.st-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.st-lvl-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  color: var(--text-muted);
}

.st-name {
  font-weight: 700;
  font-size: 14px;
}

.st-bw {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
}

.st-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.tier-hbm { border-left: 4px solid var(--accent-cyan); }
.tier-local-nvme { border-left: 4px solid var(--accent-gold); }
.tier-parallel-fs { border-left: 4px solid var(--accent-emerald); }

.checkpoint-scenario-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 10px;
}

.scenario-item {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 16px;
}

.sc-title {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
}

.sc-meter {
  position: relative;
  height: 24px;
  background: rgba(0, 0, 0, 0.4);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 0 10px;
  margin-bottom: 8px;
}

.sc-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  border-radius: 6px;
  opacity: 0.4;
}

.red-bar { background: var(--accent-red); }
.green-bar { background: var(--accent-emerald); }

.sc-time {
  position: relative;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
  z-index: 2;
}

.sc-impact {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.failure-reality-box {
  margin-top: auto;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: 10px;
  padding: 14px;
}

.fr-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--accent-red);
  margin-bottom: 6px;
}

.failure-reality-box p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ==========================================================================
   SLIDE 4: SIMULATOR (INTERACTIVE BENCHMARK)
   ========================================================================== */
.simulator-layout-grid {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 24px;
  flex: 1;
}

.sim-controls-panel, .sim-output-panel {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 22px;
  display: flex;
  flex-direction: column;
}

.panel-header-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.ph-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--accent-gold-glow);
  color: var(--accent-gold);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.control-group {
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cg-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
}

.slider-display-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

.sim-slider {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
}

.gpu-model-toggle-group, .cooling-toggle-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.gpu-toggle-btn, .cooling-toggle-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 10px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.gpu-toggle-btn:hover, .cooling-toggle-btn:hover {
  border-color: var(--border-focus);
}

.gpu-toggle-btn.active, .cooling-toggle-btn.active {
  background: rgba(6, 182, 212, 0.15);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 14px rgba(6, 182, 212, 0.2);
}

.btn-gpu-name, .cool-name {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
}

.btn-gpu-spec, .cool-pue {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
}

/* Telemetry Outputs */
.telemetry-metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}

.tm-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: var(--transition-smooth);
}

.tm-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-focus);
}

.tm-header {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tm-icon { font-size: 14px; }
.tm-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.tm-main-val {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 4px 0;
}

.tm-number {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
}

.tm-unit {
  font-size: 12px;
  color: var(--text-secondary);
}

.tm-sub-row {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-secondary);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 6px;
}

/* PUE Gauge Bar */
.pue-gauge-container {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}

.pue-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.pue-rating-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 4px;
}

.grade-a { background: rgba(16, 185, 129, 0.2); color: var(--accent-emerald); border: 1px solid rgba(16, 185, 129, 0.4); }
.grade-c { background: rgba(239, 68, 68, 0.2); color: var(--accent-red); border: 1px solid rgba(239, 68, 68, 0.4); }

.pue-bar-track {
  height: 12px;
  background: linear-gradient(90deg, #10b981 0%, #f59e0b 60%, #ef4444 100%);
  border-radius: 6px;
  position: relative;
}

.pue-bar-fill {
  position: absolute;
  top: -4px;
  height: 20px;
  width: 4px;
  background: #ffffff;
  border-radius: 2px;
  box-shadow: 0 0 10px #ffffff;
  transition: left 0.4s ease;
}

.pue-target-mark {
  position: absolute;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  transform: translateX(-50%);
}

.mark-110 { left: 15%; }
.mark-130 { left: 55%; }
.mark-150 { left: 95%; }

.pue-explanation {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.3;
}

/* ==========================================================================
   SLIDE 5: DIRECT-TO-CHIP LIQUID COOLING
   ========================================================================== */
.thermal-schematic-stage {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 24px;
  flex: 1;
}

.air-death-column, .liquid-system-diagram {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 22px;
  display: flex;
  flex-direction: column;
}

.thermal-failure-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
}

.tf-item {
  display: flex;
  gap: 14px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 14px;
}

.tf-icon {
  font-size: 22px;
}

.tf-text strong {
  display: block;
  font-size: 13px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.tf-text p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.dual-loop-flow {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.loop-block {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 14px;
}

.lb-title {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.lb-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pipe-node {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 11px;
}

.pipe-arrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 2px;
}

.cyan-arrow { color: var(--accent-cyan); }
.warm-arrow { color: var(--accent-gold); }

.cdu-isolation-barrier {
  background: rgba(245, 158, 11, 0.1);
  border: 1px dashed rgba(245, 158, 11, 0.4);
  border-radius: 8px;
  padding: 6px 12px;
  text-align: center;
}

.cib-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  color: var(--accent-gold);
}

.rack-cold-plates-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.cp-unit {
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: 6px;
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cp-chip {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
}

.cp-delta {
  font-family: var(--font-mono);
  font-size: 10px;
}

.liquid-advantage-banner {
  margin-top: 12px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: 8px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-secondary);
}

.lab-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  color: var(--accent-cyan);
}

/* ==========================================================================
   SLIDE 6: PUE ECONOMICS & GRID BOTTLENECK
   ========================================================================== */
.economics-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  flex: 1;
}

.pue-calc-card, .grid-queue-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 22px;
  display: flex;
  flex-direction: column;
}

.pue-formula-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 12px;
  text-align: center;
  margin-bottom: 16px;
}

.formula-text {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-cyan);
}

.financial-compare-table {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.fc-row {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1.2fr 1.3fr;
  padding: 10px 12px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  font-size: 12px;
  align-items: center;
}

.fc-head {
  background: transparent;
  border-color: transparent;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
}

.savings-summary-row {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.4);
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 12px 16px;
}

.grid-constraints-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 14px;
  flex: 1;
}

.gc-item {
  display: flex;
  gap: 14px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 12px 14px;
}

.gc-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  padding: 4px 8px;
  border-radius: 6px;
  height: fit-content;
  white-space: nowrap;
}

.gc-badge.gold { background: var(--accent-gold-glow); color: var(--accent-gold); border: 1px solid rgba(245, 158, 11, 0.4); }
.gc-badge.cyan { background: var(--accent-cyan-glow); color: var(--accent-cyan); border: 1px solid rgba(6, 182, 212, 0.4); }
.gc-badge.green { background: var(--accent-emerald-glow); color: var(--accent-emerald); border: 1px solid rgba(16, 185, 129, 0.4); }

.gc-detail strong {
  display: block;
  font-size: 12px;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.gc-detail p {
  font-size: 11px;
  color: var(--text-secondary);
  line-height: 1.3;
}

.grid-quote {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 12px;
  font-style: italic;
  color: var(--text-secondary);
}

/* ==========================================================================
   SLIDE 7: THE GRAND FINALE RECAP
   ========================================================================== */
.mastery-pyramid-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 24px;
  flex: 1;
}

.stack-pyramid-card, .finale-cta-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 22px;
  display: flex;
  flex-direction: column;
}

.layers-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  overflow-y: auto;
  max-height: 380px;
}

.layer-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 12px;
}

.li-ep {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 10px;
  color: var(--text-muted);
}

.li-title {
  flex: 1;
  margin: 0 12px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.li-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 4px;
}

.ep10-layer {
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.4);
}

.li-tag.gold { background: var(--accent-gold-glow); color: var(--accent-gold); }
.li-tag.purple { background: var(--accent-purple-glow); color: var(--accent-purple); }
.li-tag.emerald { background: var(--accent-emerald-glow); color: var(--accent-emerald); }
.li-tag.cyan { background: var(--accent-cyan-glow); color: var(--accent-cyan); }
.li-tag.amber { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }
.li-tag.pink { background: rgba(244, 63, 94, 0.2); color: #fb7185; }
.li-tag.blue { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }

.cta-trophy-badge {
  text-align: center;
  padding: 16px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.15), transparent 70%);
  border-radius: 12px;
  border: 1px solid rgba(245, 158, 11, 0.3);
  margin-bottom: 16px;
}

.trophy-emoji {
  font-size: 36px;
  display: block;
  margin-bottom: 6px;
}

.cta-trophy-badge h3 {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--accent-gold);
  margin-bottom: 6px;
}

.cta-trophy-badge p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.cta-action-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.cta-item {
  display: flex;
  gap: 12px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 10px 12px;
}

.cta-icon { font-size: 18px; }

.cta-text strong {
  display: block;
  font-size: 12px;
  color: var(--text-primary);
}

.cta-text p {
  font-size: 11px;
  color: var(--text-secondary);
}

.cta-return-hub-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--accent-cyan), #0284c7);
  color: #ffffff;
  font-weight: 700;
  font-size: 13px;
  text-decoration: none;
  padding: 12px 18px;
  border-radius: 8px;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 18px rgba(6, 182, 212, 0.3);
}

.cta-return-hub-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(6, 182, 212, 0.5);
}

/* ==========================================================================
   TELEPROMPTER DRAWER (HUD)
   ========================================================================== */
.teleprompter-drawer {
  position: absolute;
  top: 64px;
  right: 0;
  width: 440px;
  height: calc(100vh - 128px);
  background: rgba(14, 18, 29, 0.95);
  backdrop-filter: blur(20px);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  z-index: 90;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.teleprompter-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(0, 0, 0, 0.2);
}

.dh-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.live-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-red);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-red);
}

.dh-title-group h3 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.drawer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hud-cue-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--accent-gold-glow);
  color: var(--accent-gold);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
}

.close-btn:hover { color: var(--text-primary); }

.drawer-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.script-body {
  font-size: 15px;
  line-height: 1.65;
  color: #e2e8f0;
}

.script-body strong {
  color: var(--accent-cyan);
}

/* ==========================================================================
   BOTTOM CONTROLS BAR
   ========================================================================== */
.bottom-bar {
  height: 64px;
  background: rgba(14, 18, 29, 0.85);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 100;
}

.key-shortcut-hint {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.key-shortcut-hint kbd {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-primary);
}

.step-dots-container {
  display: flex;
  gap: 8px;
}

.step-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.step-dot:hover {
  border-color: var(--accent-cyan);
}

.step-dot.active {
  background: var(--accent-gold);
  border-color: var(--accent-gold);
  box-shadow: 0 0 10px var(--accent-gold-glow);
  transform: scale(1.25);
}

.bar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-control-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.nav-control-btn:hover:not(:disabled) {
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.nav-control-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.primary-next {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(245, 158, 11, 0.05));
  border-color: rgba(245, 158, 11, 0.5);
  color: var(--accent-gold);
}

.primary-next:hover:not(:disabled) {
  background: var(--accent-gold);
  color: #07090e;
  border-color: var(--accent-gold);
  box-shadow: 0 0 16px var(--accent-gold-glow);
}

/* ==========================================================
   CLEAN RECORDING MODE: Hide presenter tools & dev hints
   ========================================================== */
#toggle-voice-btn,
#toggle-teleprompter-btn {
  display: none !important;
}

.key-shortcut-hint {
  visibility: hidden !important;
}