/* ==========================================================================
   UnderTheHood Design System & Application Stylesheet
   First-Principles Data Engineering Platform
   ========================================================================== */

:root {
  --bg-primary: #080c14;
  --bg-secondary: #0f1623;
  --bg-tertiary: #162032;
  --bg-card: #121927;
  --bg-card-hover: #192337;
  --bg-glass: rgba(18, 25, 39, 0.75);
  
  --border-subtle: #1e2c44;
  --border-medium: #2a3d5e;
  --border-highlight: #00d4ff33;

  --text-primary: #f0f4fc;
  --text-secondary: #94a5c5;
  --text-muted: #5e7194;
  
  --accent-cyan: #00d4ff;
  --accent-cyan-dim: rgba(0, 212, 255, 0.12);
  --accent-emerald: #00f090;
  --accent-emerald-dim: rgba(0, 240, 144, 0.12);
  --accent-amber: #ffb830;
  --accent-amber-dim: rgba(255, 184, 48, 0.12);
  --accent-purple: #a855f7;
  --accent-purple-dim: rgba(168, 85, 247, 0.12);
  --accent-rose: #ff4d6d;
  --accent-rose-dim: rgba(255, 77, 109, 0.12);

  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-display: 'Space Grotesk', sans-serif;

  --sidebar-width: 320px;
  --header-height: 64px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.15);
  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Visible Keyboard Focus State for Accessibility */
:focus-visible {
  outline: 2px solid var(--accent-cyan) !important;
  outline-offset: 2px !important;
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.25) !important;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent-cyan) !important;
  outline-offset: 2px !important;
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.25) !important;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 15px;
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  -webkit-font-smoothing: antialiased;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================================================
   Layout Shell
   ========================================================================== */

.app-root {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* Top Navigation */
.top-nav {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 40;
  flex-shrink: 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.brand-symbol {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #00d4ff, #0051ff);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.35);
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

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

.brand-tagline {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-emerald);
  font-weight: 600;
}

/* Search bar */
.nav-search-container {
  display: flex;
  align-items: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0 12px;
  width: 380px;
  position: relative;
  transition: border-color var(--transition-fast);
}

.nav-search-container:focus-within {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.2);
}

.search-icon {
  color: var(--text-muted);
  margin-right: 8px;
  flex-shrink: 0;
}

.nav-search-container input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 0.88rem;
  height: 38px;
  width: 100%;
  outline: none;
  font-family: var(--font-main);
}

.nav-search-container input::placeholder {
  color: var(--text-muted);
}

.search-kbd {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-pill-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 30px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-pill-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.nav-pill-btn.accent {
  background: var(--accent-cyan-dim);
  border-color: rgba(0, 212, 255, 0.4);
  color: var(--accent-cyan);
}

.nav-pill-btn.accent:hover {
  background: rgba(0, 212, 255, 0.22);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.3);
}

.nav-progress-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 30px;
  font-size: 0.78rem;
}

.progress-lbl {
  color: var(--text-muted);
}

.progress-val {
  color: var(--accent-emerald);
  font-weight: 700;
  font-family: var(--font-mono);
}

/* Main Layout Grid */
.main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
  height: calc(100vh - var(--header-height));
}

/* ==========================================================================
   Sidebar: Course Navigation
   ========================================================================== */

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}

.sidebar-header {
  padding: 16px 18px 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-track-selector {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.sidebar-section-title {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--text-muted);
}

.course-count-badge {
  font-size: 0.7rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  padding: 2px 7px;
  border-radius: 12px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.track-pills {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.track-pill {
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.track-pill:hover {
  color: var(--text-primary);
}

.track-pill.active {
  background: var(--accent-cyan-dim);
  border-color: rgba(0, 212, 255, 0.4);
  color: var(--accent-cyan);
}

.course-nav-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Course Group in Sidebar */
.course-group {
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  transition: all var(--transition-fast);
  flex-shrink: 0; /* CRITICAL: Prevents flexbox squishing */
  min-height: 48px; /* CRITICAL: Guarantees full readable height */
}

.course-group:hover {
  border-color: var(--border-medium);
  background: rgba(255, 255, 255, 0.025);
}

.course-group.expanded {
  border-color: rgba(0, 212, 255, 0.4);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.08);
}

.course-group-header {
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  background: rgba(255, 255, 255, 0.015);
  min-height: 48px;
  box-sizing: border-box;
}

.course-group-header:hover {
  background: rgba(255, 255, 255, 0.04);
}

.course-group-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: 1;
}

.course-icon-badge {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 700;
  flex-shrink: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  transition: transform var(--transition-fast);
}

.course-icon-badge.spark { background: rgba(226, 90, 28, 0.14); border-color: rgba(226, 90, 28, 0.35); }
.course-icon-badge.snowflake { background: rgba(41, 181, 232, 0.14); border-color: rgba(41, 181, 232, 0.35); }
.course-icon-badge.dbt { background: rgba(255, 105, 75, 0.14); border-color: rgba(255, 105, 75, 0.35); }
.course-icon-badge.databricks { background: rgba(255, 54, 33, 0.14); border-color: rgba(255, 54, 33, 0.35); }
.course-icon-badge.python { background: rgba(56, 189, 248, 0.14); border-color: rgba(56, 189, 248, 0.35); }
.course-icon-badge.pandas { background: rgba(167, 139, 250, 0.14); border-color: rgba(167, 139, 250, 0.35); }
.course-icon-badge.sql { background: rgba(0, 212, 255, 0.14); border-color: rgba(0, 212, 255, 0.35); }

.course-group:hover .course-icon-badge {
  transform: scale(1.08);
}

.course-group-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.course-chevron {
  transition: transform var(--transition-fast);
  color: var(--text-muted);
  flex-shrink: 0;
  margin-left: 6px;
}

.course-group.expanded .course-chevron {
  transform: rotate(90deg);
}

.course-lessons-sublist {
  display: none;
  flex-direction: column;
  padding: 4px 8px 8px;
  gap: 2px;
  border-top: 1px solid rgba(255, 255, 255, 0.03);
}

.course-group.expanded .course-lessons-sublist {
  display: flex;
}

.sidebar-lesson-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.sidebar-lesson-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.sidebar-lesson-item.active {
  background: var(--accent-cyan-dim);
  color: var(--accent-cyan);
  font-weight: 600;
}

.sidebar-lesson-item.completed .lesson-status-icon {
  color: var(--accent-emerald);
}

.lesson-status-icon {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sidebar-footer {
  padding: 14px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-tertiary);
}

.philosophy-quote p {
  font-size: 0.75rem;
  font-style: italic;
  color: var(--text-muted);
  line-height: 1.4;
  border-left: 2px solid var(--accent-amber);
  padding-left: 8px;
}

/* ==========================================================================
   Content Viewport & Views
   ========================================================================== */

.content-viewport {
  flex: 1;
  overflow-y: auto;
  background: var(--bg-primary);
  position: relative;
}

.view-panel {
  display: none;
  padding: 32px 48px 80px;
  max-width: 1200px;
  margin: 0 auto;
}

.view-panel.active {
  display: block;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   VIEW 1: Catalog & Hardware Reality Strip
   ========================================================================== */

.hero-banner {
  margin-bottom: 40px;
  padding: 40px;
  background: radial-gradient(circle at top right, rgba(0, 212, 255, 0.08), transparent 60%),
              radial-gradient(circle at bottom left, rgba(168, 85, 247, 0.06), transparent 50%),
              var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.hero-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-cyan-dim);
  border: 1px solid rgba(0, 212, 255, 0.3);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 16px;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulse 1.8s infinite;
}

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

.hero-title {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.gradient-text {
  background: linear-gradient(135deg, #00d4ff 0%, #00f090 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 780px;
  line-height: 1.6;
  margin-bottom: 28px;
}

.hero-subtitle strong {
  color: var(--text-primary);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Latency Strip */
.latency-strip-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 48px;
  box-shadow: var(--shadow-sm);
}

.strip-header {
  margin-bottom: 20px;
}

.strip-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-amber);
  letter-spacing: 0.08em;
  font-weight: 600;
  display: block;
  margin-bottom: 4px;
}

.strip-header h3 {
  font-size: 1.25rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.strip-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  max-width: 820px;
}

.latency-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.latency-node {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.latency-node:hover {
  transform: translateY(-2px);
  border-color: var(--border-medium);
}

.latency-node.highlight {
  border-color: rgba(255, 77, 109, 0.4);
  background: linear-gradient(180deg, rgba(255, 77, 109, 0.06), var(--bg-secondary));
}

.latency-meter {
  height: 4px;
  border-radius: 2px;
  margin-bottom: 12px;
  width: 100%;
}

.meter-l1 { background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan); }
.meter-ram { background: var(--accent-emerald); }
.meter-ssd { background: var(--accent-amber); }
.meter-datacenter { background: var(--accent-purple); }
.meter-s3 { background: var(--accent-rose); box-shadow: 0 0 8px var(--accent-rose); }

.node-meta {
  display: flex;
  flex-direction: column;
}

.node-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.node-raw {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.node-human {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin: 6px 0 2px;
}

.latency-node.highlight .node-human {
  color: var(--accent-rose);
}

.node-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Course Grid */
.catalog-section {
  margin-top: 16px;
}

.section-title-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section-heading {
  font-size: 1.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.section-subtext {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.catalog-stats {
  display: flex;
  gap: 8px;
}

.stat-pill {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.stat-pill strong {
  color: var(--accent-cyan);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-smooth);
  cursor: pointer;
}

.course-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card-top-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-badge {
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-badge.spark { background: rgba(226, 90, 41, 0.15); color: #ff7748; }
.card-badge.snowflake { background: rgba(41, 181, 232, 0.15); color: #29b5e8; }
.card-badge.dbt { background: rgba(255, 106, 0, 0.15); color: #ff7733; }
.card-badge.databricks { background: rgba(255, 54, 33, 0.15); color: #ff5240; }
.card-badge.python { background: rgba(55, 118, 171, 0.2); color: #4b8bbe; }
.card-badge.pandas { background: rgba(18, 19, 82, 0.3); color: #130654; }
.card-badge.sql { background: rgba(0, 240, 144, 0.15); color: var(--accent-emerald); }

.card-lesson-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.card-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.card-dilemma {
  background: rgba(0, 0, 0, 0.25);
  border-left: 3px solid var(--accent-amber);
  padding: 8px 12px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 16px;
}

.card-dilemma-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-amber);
  display: block;
  margin-bottom: 2px;
  letter-spacing: 0.06em;
}

.card-dilemma-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 20px;
  flex: 1;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
}

.card-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
  margin-right: 14px;
}

.card-progress-fill {
  height: 100%;
  background: var(--accent-emerald);
  border-radius: 3px;
  transition: width 0.3s ease;
}

.card-enter-btn {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   VIEW 2: Active Lesson Reader
   ========================================================================== */

.lesson-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 32px;
}

.lesson-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
}

.breadcrumb-back-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.breadcrumb-back-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.breadcrumb-sep {
  color: var(--text-muted);
}

.breadcrumb-course {
  color: var(--text-muted);
}

.breadcrumb-lesson {
  color: var(--accent-cyan);
  font-weight: 600;
}

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

.action-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.action-icon-btn.bookmarked {
  color: var(--accent-amber);
  background: var(--accent-amber-dim);
  border-color: rgba(255, 184, 48, 0.4);
}

.action-pill-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-pill-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.action-pill-btn.mark-complete {
  background: var(--accent-emerald-dim);
  color: var(--accent-emerald);
  border-color: rgba(0, 240, 144, 0.3);
}

.action-pill-btn.mark-complete.completed {
  background: var(--accent-emerald);
  color: #061e12;
  font-weight: 700;
}

/* Lesson Article Styling */
.lesson-body-container {
  max-width: 860px;
  margin: 0 auto;
}

.lesson-hero {
  margin-bottom: 36px;
}

.lesson-tag-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.lesson-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 4px;
}

.lesson-main-title {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.lesson-premise {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* The Veritasium Callout Blocks */
.veritasium-dilemma-box {
  background: linear-gradient(135deg, rgba(255, 184, 48, 0.08), rgba(255, 77, 109, 0.05));
  border: 1px solid rgba(255, 184, 48, 0.35);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin: 32px 0;
  position: relative;
}

.dilemma-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.dilemma-icon {
  width: 28px;
  height: 28px;
  background: var(--accent-amber);
  color: #1a0f00;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 0.9rem;
}

.dilemma-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-amber);
  letter-spacing: 0.02em;
}

.dilemma-body {
  font-size: 0.98rem;
  color: var(--text-primary);
  line-height: 1.65;
}

/* Contrast Box: Bad Tutorial vs First Principle Reality */
.contrast-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 32px 0;
}

.contrast-col {
  border-radius: var(--radius-md);
  padding: 20px;
}

.contrast-col.bad {
  background: rgba(255, 77, 109, 0.06);
  border: 1px solid rgba(255, 77, 109, 0.25);
}

.contrast-col.reality {
  background: rgba(0, 240, 144, 0.06);
  border: 1px solid rgba(0, 240, 144, 0.25);
}

.contrast-label {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.contrast-col.bad .contrast-label { color: var(--accent-rose); }
.contrast-col.reality .contrast-label { color: var(--accent-emerald); }

.contrast-col h4 {
  font-size: 0.98rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.contrast-col p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Lesson Prose & Headings */
.lesson-article h2 {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 40px 0 16px;
  letter-spacing: -0.01em;
}

.lesson-article h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 12px;
}

.lesson-article p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.lesson-article ul, .lesson-article ol {
  padding-left: 24px;
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.lesson-article li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.lesson-article strong {
  color: var(--text-primary);
}

/* Mechanical Diagram Box */
.mechanical-box {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 28px 0;
}

.mech-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 10px;
}

.mech-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.mech-tag {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Code Snippet Box */
.code-block-wrapper {
  background: #060a12;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin: 24px 0;
  overflow: hidden;
}

.code-header {
  background: var(--bg-tertiary);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.code-lang-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.code-copy-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast);
}

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

.code-pre {
  padding: 16px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.6;
  color: #e2e8f0;
}

/* Interactive Knowledge Check in Lesson */
.knowledge-check-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 40px 0;
}

.kc-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-purple);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  display: block;
}

.kc-question {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.4;
}

.kc-options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.kc-option-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  text-align: left;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.4;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.kc-option-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.kc-option-btn.selected-correct {
  background: rgba(0, 240, 144, 0.12);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
  font-weight: 600;
}

.kc-option-btn.selected-wrong {
  background: rgba(255, 77, 109, 0.12);
  border-color: var(--accent-rose);
  color: var(--accent-rose);
}

.kc-explanation-box {
  display: none;
  background: var(--bg-tertiary);
  border-left: 3px solid var(--accent-emerald);
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem;
  color: var(--text-primary);
  line-height: 1.5;
}

/* Lesson Nav Footer */
.lesson-nav-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 28px;
  margin-top: 48px;
}

.nav-btn-text {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.nav-btn-text .sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.nav-btn-text .title {
  font-size: 0.9rem;
  font-weight: 700;
  color: inherit;
}

#btn-prev-lesson .nav-btn-text {
  text-align: right;
}

.lesson-progress-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.anti-fluff-pill {
  background: var(--accent-emerald-dim);
  color: var(--accent-emerald);
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
}

/* ==========================================================================
   VIEW 3: Interactive Simulators Workbench
   ========================================================================== */

.sim-header {
  margin-bottom: 32px;
}

.sim-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}

.sim-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.sim-subtitle {
  font-size: 0.98rem;
  color: var(--text-secondary);
  max-width: 780px;
}

.sim-tabs {
  display: flex;
  gap: 8px;
  margin-top: 20px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1px;
}

.sim-tab {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sim-tab:hover {
  color: var(--text-primary);
}

.sim-tab.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}

/* Simulator Canvas / Stage */
.simulator-stage {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 28px;
  min-height: 540px;
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   Simulator 1: PySpark Visual Architecture & Shuffle Engine
   ========================================================================== */

.spark-sim-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Subnav Navigation for 4 PySpark Visual Modes */
.pyspark-mode-nav {
  display: flex;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 6px;
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.pyspark-nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.pyspark-nav-btn:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

.pyspark-nav-btn.active {
  color: var(--accent-cyan);
  background: var(--bg-card);
  border-color: rgba(0, 212, 255, 0.35);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.12);
}

.pyspark-nav-btn .badge-pill {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.pyspark-nav-btn.active .badge-pill {
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent-cyan);
}

/* Telemetry HUD Bar */
.pyspark-hud-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.pyspark-hud-stat {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pyspark-hud-label {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pyspark-hud-val {
  font-size: 1.05rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.pyspark-hud-val.good { color: var(--accent-emerald); }
.pyspark-hud-val.warning { color: var(--accent-amber); }
.pyspark-hud-val.danger { color: var(--accent-rose); }
.pyspark-hud-val.info { color: var(--accent-cyan); }

/* Common Simulator Controls Bar */
.sim-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  flex-wrap: wrap;
  gap: 12px;
}

.sim-control-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.sim-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 7px 14px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.sim-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
}

.sim-btn.primary {
  background: var(--accent-cyan);
  color: #03141f;
  border-color: var(--accent-cyan);
}

.sim-btn.primary:hover {
  background: #2de0ff;
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.4);
}

.sim-btn.active-rose {
  background: rgba(255, 77, 109, 0.15);
  border-color: var(--accent-rose);
  color: var(--accent-rose);
}

.sim-btn.active-emerald {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

.sim-status-log {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-amber);
  max-width: 550px;
}

/* ==========================================================================
   MODE 1: Silicon Pipeline Interactive Flow
   ========================================================================== */
.silicon-pipeline-board {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.silicon-flow-track {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  position: relative;
}

@media (max-width: 1024px) {
  .silicon-flow-track {
    grid-template-columns: repeat(3, 1fr);
  }
}

.silicon-stage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.silicon-stage-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.silicon-stage-card.active {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.05);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.15);
}

.silicon-stage-card.completed {
  border-color: rgba(16, 185, 129, 0.4);
}

.stage-num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-size: 0.68rem;
  font-family: var(--font-mono);
  font-weight: 700;
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.silicon-stage-card.active .stage-num-badge {
  background: var(--accent-cyan);
  color: #02121e;
}

.silicon-stage-card.completed .stage-num-badge {
  background: var(--accent-emerald);
  color: #02121e;
}

.stage-card-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
}

.stage-card-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}

.stage-card-status {
  margin-top: auto;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  padding: 3px 6px;
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-muted);
}

.silicon-stage-card.active .stage-card-status {
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent-cyan);
}

.stage-pulse-indicator {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-medium);
}

.silicon-stage-card.active .stage-pulse-indicator {
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulseBeacon 1.2s infinite;
}

@keyframes pulseBeacon {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.6); opacity: 0.4; }
  100% { transform: scale(1); opacity: 1; }
}

/* Deep Stage Detail Showcase */
.silicon-stage-detail-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
}

@media (max-width: 900px) {
  .silicon-stage-detail-box {
    grid-template-columns: 1fr;
  }
}

.stage-detail-left {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stage-detail-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
}

.stage-detail-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stage-detail-body {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.stage-silicon-hardware-note {
  background: var(--bg-card);
  border-left: 3px solid var(--accent-amber);
  padding: 10px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.stage-silicon-hardware-note strong {
  color: var(--accent-amber);
}

.stage-detail-right {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-family: var(--font-mono);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stage-code-banner {
  font-size: 0.72rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 6px;
  display: flex;
  justify-content: space-between;
}

.stage-code-content {
  font-size: 0.78rem;
  color: #a78bfa;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
}

.stage-memory-breakdown {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
}

.stage-memory-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.stage-memory-row strong {
  color: var(--text-primary);
}

/* ==========================================================================
   MODE 2: Narrow vs Wide Network Physics Comparator
   ========================================================================== */
.narrow-wide-comparator-board {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.nw-toggle-switch {
  display: flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 4px;
  width: fit-content;
}

.nw-switch-btn {
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.nw-switch-btn.active.narrow {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.2);
}

.nw-switch-btn.active.wide {
  background: rgba(255, 77, 109, 0.15);
  color: var(--accent-rose);
  box-shadow: 0 0 10px rgba(255, 77, 109, 0.2);
}

.nw-arena-grid {
  display: grid;
  grid-template-columns: 1fr 140px 1fr;
  gap: 20px;
  align-items: center;
}

.nw-executor-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.nw-executor-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nw-executor-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nw-channel-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.nw-channel-pipe {
  width: 100%;
  height: 3px;
  background: var(--border-medium);
  position: relative;
  border-radius: 2px;
}

.nw-channel-pipe.streaming {
  background: linear-gradient(90deg, var(--accent-rose), var(--accent-cyan));
  box-shadow: 0 0 10px rgba(255, 77, 109, 0.4);
}

.nw-stream-dot {
  position: absolute;
  top: -4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 8px #fff;
}

.nw-stream-dot.active {
  animation: streamFly 0.8s infinite linear;
}

@keyframes streamFly {
  0% { left: 0%; opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { left: 95%; opacity: 0; }
}

/* ==========================================================================
   MODE 3: Skew Meltdown & Key Salting Engine
   ========================================================================== */
.skew-arena-board {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.skew-node-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

@media (max-width: 900px) {
  .skew-node-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.skew-node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all var(--transition-fast);
}

.skew-node-card.choked {
  border-color: var(--accent-rose);
  background: rgba(255, 77, 109, 0.06);
  box-shadow: 0 0 20px rgba(255, 77, 109, 0.2);
}

.skew-node-card.salted {
  border-color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.05);
}

.skew-node-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.skew-node-id {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.skew-node-status {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.skew-node-card.choked .skew-node-status {
  background: rgba(255, 77, 109, 0.2);
  color: var(--accent-rose);
  font-weight: 700;
}

.skew-node-card.salted .skew-node-status {
  background: rgba(16, 185, 129, 0.2);
  color: var(--accent-emerald);
}

.skew-mem-track {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.skew-mem-fill {
  height: 100%;
  background: var(--accent-emerald);
  transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1), background 0.3s;
}

.skew-mem-fill.critical {
  background: var(--accent-rose);
  box-shadow: 0 0 8px var(--accent-rose);
}

.skew-key-pill-box {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-height: 48px;
}

.skew-key-chip {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.skew-key-chip.hot {
  border-color: var(--accent-rose);
  color: var(--accent-rose);
  font-weight: 700;
  background: rgba(255, 77, 109, 0.12);
}

.skew-key-chip.salted {
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
}

/* ==========================================================================
   MODE 4: Python UDF vs Tungsten Serialization Tax
   ========================================================================== */
.udf-tax-board {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.udf-split-matrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 850px) {
  .udf-split-matrix {
    grid-template-columns: 1fr;
  }
}

.udf-column-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.udf-column-card.native {
  border-color: rgba(0, 212, 255, 0.3);
}

.udf-column-card.python {
  border-color: rgba(255, 77, 109, 0.3);
}

.udf-badge-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.udf-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.udf-tag-pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 700;
}

.udf-tag-pill.good {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
}

.udf-tag-pill.bad {
  background: rgba(255, 77, 109, 0.15);
  color: var(--accent-rose);
}

.udf-flow-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.udf-flow-step {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 7px 10px;
  border-radius: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.udf-flow-step.bottleneck {
  border-color: var(--accent-rose);
  background: rgba(255, 77, 109, 0.08);
  color: var(--accent-rose);
  font-weight: 700;
}

.udf-flow-step.direct {
  border-color: rgba(0, 212, 255, 0.3);
  background: rgba(0, 212, 255, 0.06);
  color: var(--accent-cyan);
}

.udf-speedometer-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: center;
}

.udf-speed-num {
  font-size: 1.6rem;
  font-family: var(--font-mono);
  font-weight: 800;
}

.udf-speed-num.fast { color: var(--accent-emerald); text-shadow: 0 0 12px rgba(16, 185, 129, 0.3); }
.udf-speed-num.slow { color: var(--accent-rose); text-shadow: 0 0 12px rgba(255, 77, 109, 0.3); }

.udf-speed-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   MODE 5: Enterprise Mission & Subtasks Architecture (Company A Case Study)
   ========================================================================== */
.enterprise-mission-board {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.mission-hero-banner {
  background: linear-gradient(135deg, rgba(3, 20, 31, 0.95), rgba(15, 23, 42, 0.9));
  border: 1px solid rgba(0, 212, 255, 0.35);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  overflow: hidden;
}

.mission-hero-banner::after {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.mission-top-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
}

.mission-title-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mission-badge-chip {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.3);
  padding: 3px 8px;
  border-radius: 4px;
  width: fit-content;
}

.mission-company-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
}

.mission-goal-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 820px;
}

.mission-kpis-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 4px;
}

@media (max-width: 900px) {
  .mission-kpis-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.mission-kpi-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.mission-kpi-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.mission-kpi-val {
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

/* 3 Physical Materials Grid */
.materials-section-title {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

@media (max-width: 900px) {
  .materials-grid {
    grid-template-columns: 1fr;
  }
}

.material-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
}

.material-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.material-id-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
}

.material-id-badge.mat-x { background: rgba(239, 68, 68, 0.15); color: #ef4444; border: 1px solid rgba(239, 68, 68, 0.3); }
.material-id-badge.mat-y { background: rgba(56, 189, 248, 0.15); color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.3); }
.material-id-badge.mat-z { background: rgba(16, 185, 129, 0.15); color: #10b981; border: 1px solid rgba(16, 185, 129, 0.3); }

.material-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.material-uri {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-amber);
  background: var(--bg-primary);
  padding: 4px 8px;
  border-radius: 4px;
  word-break: break-all;
}

.material-props {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.74rem;
  color: var(--text-secondary);
}

.material-props strong {
  color: var(--text-primary);
}

/* Why PySpark Decision Matrix */
.decision-matrix-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.decision-matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
}

.decision-matrix-table th {
  text-align: left;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-medium);
  text-transform: uppercase;
}

.decision-matrix-table td {
  padding: 10px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: middle;
}

.decision-matrix-table tr.chosen {
  background: rgba(16, 185, 129, 0.05);
}

.decision-matrix-table tr.chosen td {
  color: var(--text-primary);
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  padding: 3px 6px;
  border-radius: 4px;
}

.status-badge.failed { background: rgba(239, 68, 68, 0.15); color: #ef4444; }
.status-badge.expensive { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }
.status-badge.winner { background: rgba(16, 185, 129, 0.18); color: #10b981; border: 1px solid rgba(16, 185, 129, 0.4); }

/* The XYZ Team's Subtasks Flow Track */
.subtasks-flow-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

@media (max-width: 900px) {
  .subtasks-flow-track {
    grid-template-columns: 1fr;
  }
}

.subtask-node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.subtask-node-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.subtask-node-card.active {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.06);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.15);
}

.subtask-node-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.subtask-code-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.subtask-node-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
}

.subtask-node-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* Subtask Deep Dive Box */
.subtask-detail-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 20px;
}

@media (max-width: 900px) {
  .subtask-detail-box {
    grid-template-columns: 1fr;
  }
}

.subtask-detail-left {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.subtask-detail-right {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-family: var(--font-mono);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Production Management & Monitoring Box */
.monitoring-hud-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

@media (max-width: 800px) {
  .monitoring-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.monitoring-metric-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.monitoring-metric-box.good { border-left: 3px solid var(--accent-emerald); }
.monitoring-metric-box.warning { border-left: 3px solid var(--accent-amber); }
.monitoring-metric-box.info { border-left: 3px solid var(--accent-cyan); }


/* Takeaway Footer Banner */
.sim-lesson-takeaway {
  background: var(--bg-secondary);
  border-left: 3px solid var(--accent-cyan);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.sim-takeaway-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}

.sim-takeaway-text {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.5;
}


/* Simulator 2: Snowflake Metadata Pruner */
.snowflake-sim-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sf-query-console {
  background: #060a12;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.sf-query-line {
  color: #a5b4fc;
}

.sf-query-keyword {
  color: #38bdf8;
  font-weight: 700;
}

.sf-query-val {
  color: #4ade80;
}

.sf-micropartitions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.micropartition-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  transition: all 0.3s ease;
}

.micropartition-card.pruned {
  opacity: 0.35;
  border-color: var(--border-subtle);
  background: #090e18;
}

.micropartition-card.scanned {
  border-color: var(--accent-emerald);
  box-shadow: 0 0 16px rgba(0, 240, 144, 0.2);
  background: rgba(0, 240, 144, 0.05);
}

.mp-file-name {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.mp-status-tag {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 4px;
  align-self: flex-start;
}

.mp-status-tag.pruned {
  background: rgba(255, 77, 109, 0.15);
  color: var(--accent-rose);
}

.mp-status-tag.scanned {
  background: var(--accent-emerald-dim);
  color: var(--accent-emerald);
}

.mp-metadata-table {
  background: var(--bg-card);
  border-radius: 4px;
  padding: 8px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.mp-meta-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 2px;
  color: var(--text-secondary);
}

.mp-meta-val {
  color: var(--accent-cyan);
  font-weight: 600;
}

/* Simulator 3: Pandas vs Vectorized C-Buffers */
.pandas-sim-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.memory-architecture-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.mem-model-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
}

.mem-model-box.python-list {
  border-color: rgba(255, 184, 48, 0.4);
}

.mem-model-box.numpy-c {
  border-color: rgba(0, 212, 255, 0.4);
}

.mem-model-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.mem-cells-row {
  display: flex;
  gap: 6px;
  margin: 16px 0;
  overflow-x: auto;
  padding: 8px 0;
}

.mem-cell {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: 4px;
  padding: 8px 12px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  min-width: 60px;
}

.mem-cell.pointer {
  border-style: dashed;
  border-color: var(--accent-amber);
  color: var(--accent-amber);
}

.mem-cell.contiguous {
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Simulator 4: dbt SQL Pushdown DAG */
.dbt-sim-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.dbt-dag-canvas {
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 30px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  position: relative;
}

.dag-node {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 16px;
  width: 200px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.dag-node:hover, .dag-node.active {
  border-color: var(--accent-amber);
  box-shadow: 0 0 16px rgba(255, 184, 48, 0.25);
  transform: translateY(-2px);
}

.dag-node-type {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  color: var(--accent-amber);
  text-transform: uppercase;
  font-weight: 700;
}

.dag-node-name {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 4px 0 2px;
  color: var(--text-primary);
}

.dag-node-status {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.dag-arrow {
  color: var(--border-medium);
  font-size: 1.4rem;
}

/* ==========================================================================
   Simulator: The Big Picture Architecture Blueprint
   ========================================================================== */

.arch-blueprint-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.blueprint-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 12px 18px;
  border-radius: var(--radius-md);
}

.blueprint-mode-toggle {
  display: flex;
  gap: 8px;
}

.blueprint-canvas {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  background: #060a12;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
  overflow-x: auto;
}

.blueprint-stage-node {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  transition: all 0.3s ease;
}

.blueprint-stage-node.active-stage {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.2);
}

.blueprint-stage-node.broken-stage {
  border-color: var(--accent-rose);
  background: rgba(255, 77, 109, 0.1);
  box-shadow: 0 0 20px rgba(255, 77, 109, 0.3);
  animation: pulse 1.5s infinite;
}

.stage-step-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  padding: 2px 6px;
  border-radius: 4px;
  margin-bottom: 8px;
}

.blueprint-stage-node.broken-stage .stage-step-num {
  color: var(--accent-rose);
  background: rgba(255, 77, 109, 0.2);
}

.stage-node-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.stage-node-tech {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.stage-node-status {
  font-size: 0.7rem;
  padding: 3px 6px;
  border-radius: 4px;
  background: var(--accent-emerald-dim);
  color: var(--accent-emerald);
  font-weight: 600;
}

.blueprint-stage-node.broken-stage .stage-node-status {
  background: rgba(255, 77, 109, 0.2);
  color: var(--accent-rose);
}

/* Impact Dashboard */
.blueprint-impact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.impact-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
}

.impact-card.healthy {
  border-left: 4px solid var(--accent-emerald);
}

.impact-card.disaster {
  border-left: 4px solid var(--accent-rose);
  background: rgba(255, 77, 109, 0.05);
}

.impact-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.impact-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}


.btree-sim-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.btree-visual-tree {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  background: #060a12;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
}

.btree-level {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  width: 100%;
}

.btree-node-page {
  background: var(--bg-card);
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  min-width: 200px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.btree-node-page.root {
  border-color: #38bdf8;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.btree-node-page.active-traversing {
  border-color: var(--accent-amber);
  background: rgba(255, 184, 48, 0.12);
  box-shadow: 0 0 20px rgba(255, 184, 48, 0.4);
  transform: scale(1.04);
}

.btree-node-page.target-found {
  border-color: var(--accent-emerald);
  background: rgba(0, 240, 144, 0.15);
  box-shadow: 0 0 24px rgba(0, 240, 144, 0.5);
  transform: scale(1.06);
}

.page-header-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 4px;
  margin-bottom: 8px;
}

.page-capacity-tag {
  color: var(--accent-cyan);
  font-weight: 700;
}

.page-keys-array {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.btree-key-cell {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.btree-key-cell.highlight {
  background: var(--accent-cyan);
  color: #03141f;
  box-shadow: 0 0 8px var(--accent-cyan);
}

.btree-key-cell.matched {
  background: var(--accent-emerald);
  color: #041f12;
  box-shadow: 0 0 12px var(--accent-emerald);
}

/* Page Split Simulation Box */
.page-split-view {
  background: var(--bg-secondary);
  border: 1px dashed var(--accent-rose);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.split-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.split-desc strong {
  color: var(--accent-rose);
}

.io-metric-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.io-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
}

.io-card.fast {
  border-color: rgba(0, 240, 144, 0.4);
}

.io-card.slow {
  border-color: rgba(255, 77, 109, 0.4);
}

.io-card-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.io-card.fast .io-card-title { color: var(--accent-emerald); }
.io-card.slow .io-card-title { color: var(--accent-rose); }

.io-stat-val {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 2px;
}

/* ==========================================================================
   Simulator: Medallion Architecture & Star Schema
   ========================================================================== */

.medallion-sim-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.medallion-stepper {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.medallion-hop-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 18px;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.medallion-hop-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.medallion-hop-card.active {
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}

.medallion-hop-card.bronze.active { border-color: #cd7f32; background: rgba(205, 127, 50, 0.08); }
.medallion-hop-card.silver.active { border-color: #c0c0c0; background: rgba(192, 192, 192, 0.08); }
.medallion-hop-card.gold.active { border-color: #ffd700; background: rgba(255, 215, 0, 0.08); }

.hop-tier-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
  display: block;
}

.hop-tier-tag.bronze { color: #e09858; }
.hop-tier-tag.silver { color: #d6e0ea; }
.hop-tier-tag.gold { color: #ffd700; }

.hop-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.hop-storage-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 4px;
  display: inline-block;
}

.medallion-stage-detail {
  background: #060a12;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 20px;
}

.star-schema-visualizer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 20px 0;
  position: relative;
}

.dim-table-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.schema-table-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  min-width: 180px;
  box-shadow: var(--shadow-sm);
}

.schema-table-box.fact {
  border-color: #ffd700;
  box-shadow: 0 0 16px rgba(255, 215, 0, 0.2);
  min-width: 220px;
}

.schema-table-box.dim {
  border-color: #38bdf8;
}

.table-box-header {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 4px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}

.table-box-header.fact { color: #ffd700; }
.table-box-header.dim { color: #38bdf8; }

.table-cols-list {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.table-cols-list span.pk {
  color: var(--accent-amber);
  font-weight: 700;
}

.table-cols-list span.fk {
  color: var(--accent-cyan);
}

.star-connector {
  font-size: 1.2rem;
  color: var(--border-medium);
}


/* Workbook top pill and hero button */
.nav-pill-btn.workbook-mode {
  background: rgba(168, 85, 247, 0.12);
  border-color: rgba(168, 85, 247, 0.4);
  color: #c084fc;
  font-weight: 700;
}

.nav-pill-btn.workbook-mode:hover {
  background: rgba(168, 85, 247, 0.22);
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.35);
  color: #d8b4fe;
}

.btn-workbook {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(0, 212, 255, 0.15));
  border: 1px solid rgba(168, 85, 247, 0.5);
  color: #e9d5ff;
  font-size: 0.9rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-workbook:hover {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.35), rgba(0, 212, 255, 0.25));
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.4);
  color: #fff;
  transform: translateY(-1px);
}

/* ==========================================================================
   VIEW 5: Interactive Data Workbook & Enterprise Schema Lab
   ========================================================================== */

.workbook-header-banner {
  margin-bottom: 28px;
  background: radial-gradient(circle at top right, rgba(168, 85, 247, 0.1), transparent 60%),
              radial-gradient(circle at bottom left, rgba(0, 212, 255, 0.08), transparent 50%),
              var(--bg-secondary);
  border: 1px solid rgba(168, 85, 247, 0.3);
  border-radius: var(--radius-xl);
  padding: 32px 36px;
}

.workbook-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-purple);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.workbook-hero-title {
  font-family: var(--font-display);
  font-size: 2.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 10px 0;
  line-height: 1.2;
}

.workbook-hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 860px;
  line-height: 1.6;
  margin-bottom: 20px;
}

.workbook-subnav-tabs {
  display: flex;
  gap: 10px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.workbook-subnav-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 8px 18px;
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.workbook-subnav-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.workbook-subnav-btn.active {
  background: rgba(168, 85, 247, 0.18);
  border-color: var(--accent-purple);
  color: #e9d5ff;
  box-shadow: 0 0 14px rgba(168, 85, 247, 0.25);
}

.workbook-content-panel {
  display: none;
}

.workbook-content-panel.active {
  display: block;
}

/* Table Selector Bar */
.table-selector-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.app-table-tab {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.app-table-tab:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.app-table-tab.active {
  background: var(--accent-cyan-dim);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Workspace Grid: Left Dictionary, Right Records */
.workbook-workspace-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 20px;
}

.data-dictionary-container {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 20px;
  max-height: 650px;
  overflow-y: auto;
}

.dict-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 10px;
  margin-bottom: 16px;
}

.dict-header h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.dict-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--bg-tertiary);
  color: var(--accent-cyan);
  padding: 2px 8px;
  border-radius: 4px;
}

.dict-fields-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dict-field-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px;
}

.dict-field-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.dict-field-name {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--accent-amber);
}

.dict-field-type {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  padding: 2px 6px;
  border-radius: 4px;
}

.dict-field-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: 6px;
}

.dict-field-example {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  background: #060a12;
  padding: 4px 8px;
  border-radius: 4px;
  word-break: break-all;
}

/* Records Table Viewer */
.data-records-container {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.records-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.records-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.records-title-group h3 {
  font-size: 1.05rem;
  color: var(--text-primary);
}

.records-count-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--bg-tertiary);
  color: var(--accent-emerald);
  padding: 2px 8px;
  border-radius: 4px;
}

.records-search-bar input {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 6px 14px;
  color: var(--text-primary);
  font-size: 0.82rem;
  width: 240px;
  outline: none;
}

.records-search-bar input:focus {
  border-color: var(--accent-cyan);
}

.records-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  max-height: 550px;
  background: #060a12;
}

.preloaded-data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-align: left;
}

.preloaded-data-table th {
  background: var(--bg-tertiary);
  color: var(--accent-cyan);
  padding: 10px 14px;
  font-weight: 700;
  position: sticky;
  top: 0;
  border-bottom: 2px solid var(--border-medium);
  white-space: nowrap;
}

.preloaded-data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  white-space: nowrap;
}

.preloaded-data-table tr:hover td {
  background: rgba(0, 212, 255, 0.04);
  color: var(--text-primary);
}

/* ROI Deconstructor Styles */
.roi-deconstructor-container {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.roi-intro-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.roi-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent-emerald);
  letter-spacing: 0.1em;
}

.roi-intro-card h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  margin: 6px 0 10px;
}

.roi-intro-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.roi-pillars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.roi-pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

.pillar-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--accent-cyan);
  opacity: 0.3;
  margin-bottom: 4px;
}

.roi-pillar-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.roi-pillar-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Interactive ROI Calculator */
.roi-interactive-calc {
  background: #060a12;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 32px;
}

.calc-header h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.calc-header p {
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.calc-slider-group {
  margin-bottom: 28px;
}

.calc-slider-group label {
  font-size: 0.95rem;
  font-weight: 600;
  display: block;
  margin-bottom: 12px;
}

.calc-slider-group strong {
  color: var(--accent-emerald);
  font-family: var(--font-mono);
  font-size: 1.1rem;
}

.calc-slider-group input[type="range"] {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--bg-tertiary);
  outline: none;
  -webkit-appearance: none;
}

.calc-slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-emerald);
  cursor: pointer;
  box-shadow: 0 0 14px var(--accent-emerald);
}

.calc-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.calc-metric-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.calc-metric-lbl {
  font-size: 0.74rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.calc-metric-val {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 800;
}

.calc-metric-box.danger .calc-metric-val { color: var(--accent-rose); }
.calc-metric-box.cost .calc-metric-val { color: var(--accent-amber); }
.calc-metric-box.profit .calc-metric-val { color: var(--accent-emerald); }

  background: rgba(255, 77, 109, 0.12);
  border-color: rgba(255, 77, 109, 0.4);
  color: #ff6b8b;
  font-weight: 700;
}

.nav-pill-btn.incident-mode:hover {
  background: rgba(255, 77, 109, 0.22);
  box-shadow: 0 0 16px rgba(255, 77, 109, 0.35);
  color: #ff94ab;
}

.btn-incident {
  background: linear-gradient(135deg, rgba(255, 77, 109, 0.2), rgba(255, 184, 48, 0.15));
  border: 1px solid rgba(255, 77, 109, 0.5);
  color: #ffcad4;
  font-size: 0.9rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-incident:hover {
  background: linear-gradient(135deg, rgba(255, 77, 109, 0.35), rgba(255, 184, 48, 0.25));
  box-shadow: 0 0 20px rgba(255, 77, 109, 0.4);
  color: #fff;
  transform: translateY(-1px);
}

/* ==========================================================================
   VIEW 4: Incident Room (You're Hired: Real Company Crises)
   ========================================================================== */

.incident-header-banner {
  margin-bottom: 32px;
  background: radial-gradient(circle at top right, rgba(255, 77, 109, 0.1), transparent 60%),
              radial-gradient(circle at bottom left, rgba(255, 184, 48, 0.08), transparent 50%),
              var(--bg-secondary);
  border: 1px solid rgba(255, 77, 109, 0.3);
  border-radius: var(--radius-xl);
  padding: 32px 36px;
}

.incident-badge-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.live-incident-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-rose);
  box-shadow: 0 0 10px var(--accent-rose);
  animation: pulse 1.4s infinite;
}

.incident-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-rose);
  font-weight: 800;
  letter-spacing: 0.1em;
}

.incident-hero-title {
  font-family: var(--font-display);
  font-size: 2.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  line-height: 1.2;
}

.gradient-text-danger {
  background: linear-gradient(135deg, #ff4d6d 0%, #ffb830 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.incident-hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 840px;
  line-height: 1.6;
  margin-bottom: 24px;
}

.incident-selector-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
}

.incident-tab-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.incident-tab-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.incident-tab-btn.active {
  background: rgba(255, 77, 109, 0.15);
  border-color: var(--accent-rose);
  color: #ff94ab;
  box-shadow: 0 0 14px rgba(255, 77, 109, 0.25);
}

/* Incident Cockpit Card */
.incident-cockpit {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.company-profile-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
}

.company-meta-col h3 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.company-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.hired-role-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-cyan-dim);
  border: 1px solid rgba(0, 212, 255, 0.3);
  color: var(--accent-cyan);
  padding: 4px 10px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
}

.incident-stats-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: center;
  border-left: 1px solid var(--border-subtle);
  padding-left: 24px;
}

.stat-alert-item {
  display: flex;
  flex-direction: column;
}

.stat-alert-label {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
}

.stat-alert-val {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-rose);
}

/* Contrast: The Mystery vs The Mechanical Hardware Reality */
.crisis-contrast-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.crisis-box {
  border-radius: var(--radius-md);
  padding: 24px;
}

.crisis-box.mystery {
  background: rgba(255, 184, 48, 0.05);
  border: 1px solid rgba(255, 184, 48, 0.3);
}

.crisis-box.reality {
  background: rgba(0, 212, 255, 0.05);
  border: 1px solid rgba(0, 212, 255, 0.35);
}

.crisis-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 8px;
}

.crisis-box.mystery .crisis-tag { color: var(--accent-amber); }
.crisis-box.reality .crisis-tag { color: var(--accent-cyan); }

.crisis-box h4 {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.crisis-box p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Before vs After Telemetry Cockpit */
.telemetry-cockpit-card {
  background: #060a12;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.telemetry-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 12px;
  margin-bottom: 20px;
}

.telemetry-title {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.telemetry-node {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
}

.node-metric-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-mono);
  margin-bottom: 6px;
}

.node-before-val {
  font-size: 0.88rem;
  color: var(--accent-rose);
  font-weight: 600;
  text-decoration: line-through;
  opacity: 0.75;
  margin-bottom: 2px;
}

.node-after-val {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent-emerald);
}

/* The First-Principles Solution Box */
.first-principles-solution-card {
  background: var(--bg-card);
  border: 1px solid rgba(0, 240, 144, 0.4);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 0 20px rgba(0, 240, 144, 0.1);
}

.solution-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent-emerald);
  background: var(--accent-emerald-dim);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}

.solution-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.solution-explanation {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: 16px;
}


.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  font-family: var(--font-main);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-cyan);
  color: #03141f;
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.35);
}

.btn-primary:hover {
  background: #33ddff;
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.5);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  transform: translateY(-1px);
}

/* ==========================================================================
   Modals
   ========================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(3, 6, 12, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  padding: 20px;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  max-width: 650px;
  width: 100%;
  padding: 36px;
  position: relative;
  box-shadow: var(--shadow-md);
  transform: translateY(12px);
  transition: transform 0.25s ease;
}

.modal-overlay.open .modal-card {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

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

.manifesto-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-amber);
  font-weight: 800;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.modal-card h2 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.manifesto-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 30px;
}

.manifesto-rule {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.rule-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent-cyan);
  opacity: 0.7;
}

.manifesto-rule h4 {
  font-size: 0.98rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.manifesto-rule p {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.modal-action-btn {
  width: 100%;
  justify-content: center;
  padding: 12px;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 120;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-left: 4px solid var(--accent-cyan);
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  box-shadow: var(--shadow-md);
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ==========================================================================
   VIEW 5: Interactive Data Workbook & Enterprise Schema Lab Styles
   ========================================================================== */

.nav-pill-btn.workbook-mode {
  background: rgba(168, 85, 247, 0.12);
  border-color: rgba(168, 85, 247, 0.4);
  color: #c084fc;
}

.nav-pill-btn.workbook-mode:hover {
  background: rgba(168, 85, 247, 0.22);
  border-color: #c084fc;
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.35);
}

.btn-workbook {
  background: linear-gradient(135deg, #7e22ce, #9333ea);
  color: #ffffff;
  border: 1px solid rgba(192, 132, 252, 0.5);
  box-shadow: 0 0 18px rgba(168, 85, 247, 0.3);
}

.btn-workbook:hover {
  background: linear-gradient(135deg, #9333ea, #a855f7);
  box-shadow: 0 0 24px rgba(168, 85, 247, 0.5);
  transform: translateY(-1px);
}

.workbook-header-banner {
  background: linear-gradient(135deg, rgba(20, 16, 36, 0.95), rgba(10, 14, 28, 0.95));
  border: 1px solid rgba(168, 85, 247, 0.35);
  border-radius: var(--radius-xl);
  padding: 36px 36px 28px;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.workbook-header-banner::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.workbook-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.workbook-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: #c084fc;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  padding: 4px 10px;
  border-radius: 6px;
  text-transform: uppercase;
}

.workbook-hero-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 12px;
}

.workbook-hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 820px;
  line-height: 1.6;
  margin-bottom: 24px;
}

.workbook-subnav-tabs {
  display: flex;
  gap: 12px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
  flex-wrap: wrap;
}

.workbook-subnav-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.workbook-subnav-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.workbook-subnav-btn.active {
  background: rgba(168, 85, 247, 0.18);
  border-color: #a855f7;
  color: #f3e8ff;
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.25);
}

.workbook-content-panel {
  display: none;
}

.workbook-content-panel.active {
  display: block;
}

/* App Switcher Tabs inside Subpanel 1 */
.table-selector-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.table-sel-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
}

.table-sel-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.table-sel-btn.active {
  background: var(--bg-card);
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.2);
}

.table-app-badge {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
}

.table-sel-btn.active .table-app-badge {
  background: var(--accent-cyan);
  color: #03141f;
}

/* Subpanel 1: Split View Grid */
.workbook-workspace-grid {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 24px;
  align-items: start;
}

/* Left: Data Dictionary Column */
.data-dictionary-container {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.dict-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 14px;
  margin-bottom: 16px;
}

.dict-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.dict-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--accent-cyan);
  padding: 3px 8px;
  border-radius: 4px;
}

.dict-fields-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 640px;
  overflow-y: auto;
  padding-right: 6px;
}

.dict-field-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  transition: all var(--transition-fast);
}

.dict-field-card:hover {
  border-color: rgba(0, 212, 255, 0.4);
  background: var(--bg-card-hover);
}

.dict-field-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.dict-field-name {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
  color: #38bdf8;
}

.dict-type-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 184, 48, 0.12);
  border: 1px solid rgba(255, 184, 48, 0.3);
  color: var(--accent-amber);
}

.dict-type-tag.pk {
  background: rgba(0, 240, 144, 0.12);
  border-color: rgba(0, 240, 144, 0.35);
  color: var(--accent-emerald);
}

.dict-field-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 8px;
}

.dict-field-example-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.74rem;
  background: var(--bg-tertiary);
  border-radius: 4px;
  padding: 4px 8px;
  border: 1px solid var(--border-subtle);
}

.dict-example-lbl {
  color: var(--text-muted);
  font-weight: 600;
}

.dict-example-val {
  font-family: var(--font-mono);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Right: Preloaded Records Table Column */
.data-records-container {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 600px;
}

.records-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.records-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.records-title-group h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.records-count-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: rgba(0, 240, 144, 0.12);
  border: 1px solid rgba(0, 240, 144, 0.3);
  color: var(--accent-emerald);
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 700;
}

.records-search-bar {
  display: flex;
  align-items: center;
  min-width: 260px;
}

.records-search-bar input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.records-search-bar input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.25);
}

.records-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: #060a12;
}

.records-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  text-align: left;
}

.records-table th {
  background: var(--bg-tertiary);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 14px;
  border-bottom: 2px solid var(--border-medium);
  white-space: nowrap;
}

.records-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  color: var(--text-secondary);
  white-space: nowrap;
}

.records-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
}

.records-table td.cell-highlight {
  background: rgba(0, 212, 255, 0.18) !important;
  color: #38bdf8 !important;
  font-weight: 700;
}

.table-desc-strip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.table-engine-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-amber);
  background: rgba(255, 184, 48, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
}

/* ==========================================================================
   Workbook Subpanel 2: Why Pipelines Are Big Business (ROI Deconstructor)
   ========================================================================== */

.roi-deconstructor-container {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.roi-intro-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.roi-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--accent-emerald);
  background: var(--accent-emerald-dim);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 10px;
}

.roi-intro-card h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.roi-intro-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 860px;
}

.roi-pillars-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.roi-pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-fast);
}

.roi-pillar-card:hover {
  border-color: rgba(0, 212, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.pillar-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent-cyan);
  opacity: 0.8;
  margin-bottom: 10px;
  line-height: 1;
}

.roi-pillar-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.3;
}

.roi-pillar-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.roi-pillar-card strong {
  color: var(--text-primary);
}

/* Interactive ROI Calculator Card */
.roi-interactive-calc {
  background: #060a12;
  border: 1px solid rgba(0, 240, 144, 0.3);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: 0 0 24px rgba(0, 240, 144, 0.08);
}

.calc-header {
  margin-bottom: 24px;
}

.calc-header h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.calc-header p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.calc-slider-group {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.calc-slider-group label {
  font-size: 0.95rem;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.calc-slider-group strong {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--accent-cyan);
}

.calc-slider-group input[type="range"] {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
  height: 6px;
}

.calc-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.calc-metric-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.calc-metric-box.danger {
  border-color: rgba(255, 77, 109, 0.4);
}

.calc-metric-box.cost {
  border-color: rgba(255, 184, 48, 0.4);
}

.calc-metric-box.profit {
  border-color: rgba(0, 240, 144, 0.4);
  background: rgba(0, 240, 144, 0.03);
}

.calc-metric-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-mono);
  line-height: 1.4;
  margin-bottom: 12px;
}

.calc-metric-val {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.1;
}

.calc-metric-box.danger .calc-metric-val { color: var(--accent-rose); }
.calc-metric-box.cost .calc-metric-val { color: var(--accent-amber); }
.calc-metric-box.profit .calc-metric-val { color: var(--accent-emerald); }

/* ==========================================================================
   VIEW 6: Security Hardening & Agent Guardrails Styles
   ========================================================================== */

.nav-pill-btn.guardrails-mode {
  background: rgba(0, 240, 144, 0.12);
  border-color: rgba(0, 240, 144, 0.4);
  color: var(--accent-emerald);
}

.nav-pill-btn.guardrails-mode:hover {
  background: rgba(0, 240, 144, 0.22);
  border-color: var(--accent-emerald);
  box-shadow: 0 0 16px rgba(0, 240, 144, 0.35);
}

.btn-guardrails {
  background: linear-gradient(135deg, #065f46, #047857);
  color: #ffffff;
  border: 1px solid rgba(0, 240, 144, 0.4);
  box-shadow: 0 0 18px rgba(0, 240, 144, 0.25);
}

.btn-guardrails:hover {
  background: linear-gradient(135deg, #047857, #059669);
  box-shadow: 0 0 24px rgba(0, 240, 144, 0.45);
  transform: translateY(-1px);
}

.guardrails-header-banner {
  background: linear-gradient(135deg, rgba(8, 28, 20, 0.95), rgba(6, 18, 30, 0.95));
  border: 1px solid rgba(0, 240, 144, 0.35);
  border-radius: var(--radius-xl);
  padding: 36px 36px 28px;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.guardrails-header-banner::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(0, 240, 144, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.guardrails-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.guardrails-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--accent-emerald);
  background: var(--accent-emerald-dim);
  border: 1px solid rgba(0, 240, 144, 0.3);
  padding: 4px 10px;
  border-radius: 6px;
  text-transform: uppercase;
}

.guardrails-subtag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  padding: 4px 10px;
  border-radius: 6px;
  letter-spacing: 0.06em;
}

.guardrails-hero-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 12px;
}

.gradient-text-guard {
  background: linear-gradient(135deg, #00f090 0%, #00d4ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.guardrails-hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 840px;
  line-height: 1.6;
  margin-bottom: 24px;
}

.guardrails-subnav-tabs {
  display: flex;
  gap: 12px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
  flex-wrap: wrap;
}

.guardrails-subnav-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.guardrails-subnav-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.guardrails-subnav-btn.active {
  background: rgba(0, 240, 144, 0.15);
  border-color: var(--accent-emerald);
  color: #f0fdf4;
  box-shadow: 0 0 16px rgba(0, 240, 144, 0.25);
}

.guardrails-content-panel {
  display: none;
}

.guardrails-content-panel.active {
  display: block;
}

/* Guardrails Subpanel 1: Protocol Grid */
.guardrails-protocol-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.protocol-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 26px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.protocol-card:hover {
  border-color: rgba(0, 240, 144, 0.4);
  transform: translateY(-2px);
}

.protocol-header {
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
  margin-bottom: 18px;
}

.protocol-icon {
  font-size: 1.8rem;
}

.protocol-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.protocol-rule-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.protocol-rules-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.protocol-rule-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.protocol-rule-item strong {
  display: block;
  color: var(--text-primary);
  margin-bottom: 4px;
  font-size: 0.88rem;
}

/* Guardrails Subpanel 2: Interactive 7-Point Checklist */
.checklist-interactive-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.checklist-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 20px;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 20px;
}

.checklist-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent-amber);
  background: rgba(255, 184, 48, 0.12);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 8px;
}

.checklist-header h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.checklist-header p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.checklist-gate-status {
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}

.gate-status-pill {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 800;
  padding: 6px 14px;
  border-radius: 6px;
  display: inline-block;
  letter-spacing: 0.06em;
}

.gate-status-pill.pending {
  background: rgba(255, 77, 109, 0.15);
  border: 1px solid rgba(255, 77, 109, 0.4);
  color: var(--accent-rose);
}

.gate-status-pill.approved {
  background: rgba(0, 240, 144, 0.15);
  border: 1px solid rgba(0, 240, 144, 0.4);
  color: var(--accent-emerald);
  box-shadow: 0 0 16px rgba(0, 240, 144, 0.3);
}

.gate-status-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.checklist-items-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.checklist-item-row {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.checklist-item-row:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
}

.checklist-item-row.checked {
  background: rgba(0, 240, 144, 0.05);
  border-color: rgba(0, 240, 144, 0.4);
}

.chk-box-custom {
  width: 22px;
  height: 22px;
  border: 2px solid var(--border-medium);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 800;
  font-size: 0.85rem;
  color: transparent;
  transition: all var(--transition-fast);
}

.checklist-item-row.checked .chk-box-custom {
  background: var(--accent-emerald);
  border-color: var(--accent-emerald);
  color: #041f12;
}

.chk-item-content {
  flex: 1;
}

.chk-item-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.chk-item-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.checklist-footer-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
}

/* Guardrails Subpanel 3: Live Hardening Audit Matrix */
.audit-matrix-container {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-md);
}

.audit-matrix-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.audit-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 6px;
}

.audit-matrix-header h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.audit-matrix-header p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.audit-filters-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.audit-filter-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.audit-filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.audit-filter-btn.active {
  background: var(--bg-tertiary);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.audit-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: #060a12;
}

.audit-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  text-align: left;
}

.audit-table th {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 16px;
  border-bottom: 2px solid var(--border-medium);
}

.audit-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.audit-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-primary);
}

.audit-area-cell {
  font-weight: 600;
  color: var(--text-primary);
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  white-space: nowrap;
}

.status-badge.fixed {
  background: rgba(0, 240, 144, 0.12);
  border: 1px solid rgba(0, 240, 144, 0.35);
  color: var(--accent-emerald);
}

.status-badge.rolling-out {
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.35);
  color: var(--accent-cyan);
}

.status-badge.review {
  background: rgba(255, 184, 48, 0.12);
  border: 1px solid rgba(255, 184, 48, 0.35);
  color: var(--accent-amber);
}

.status-badge.open {
  background: rgba(255, 77, 109, 0.12);
  border: 1px solid rgba(255, 77, 109, 0.35);
  color: var(--accent-rose);
}

.status-badge.later {
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.35);
  color: #c084fc;
}

.owner-pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .guardrails-protocol-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 1024px) {
  .latency-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contrast-card {
    grid-template-columns: 1fr;
  }
  .spark-cluster-board {
    grid-template-columns: 1fr;
  }
  .sf-micropartitions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .workbook-workspace-grid {
    grid-template-columns: 1fr;
  }
  .roi-pillars-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -100%;
    top: var(--header-height);
    bottom: 0;
    z-index: 50;
    transition: left var(--transition-smooth);
  }
  .sidebar.open {
    left: 0;
  }
  .view-panel {
    padding: 20px 16px 60px;
  }
  .roi-pillars-grid {
    grid-template-columns: 1fr;
  }
  .calc-metrics-row {
    grid-template-columns: 1fr;
  }
  .nav-search-container {
    display: none;
  }
  .hero-title {
    font-size: 2rem;
  }
}

/* ==========================================================================
   WORKBOOK: FlowForge & Mermaid App Badges & How-To Playbooks
   ========================================================================== */

/* App Badges in Table Selector */
.table-app-badge.flowforge {
  background: linear-gradient(135deg, #ea580c, #c2410c);
  color: #ffffff;
  box-shadow: 0 0 10px rgba(234, 88, 12, 0.4);
}

.table-app-badge.mermaid {
  background: linear-gradient(135deg, #a855f7, #7e22ce);
  color: #ffffff;
  box-shadow: 0 0 10px rgba(168, 85, 247, 0.4);
}

/* Table View How-To Box (Underneath Dictionary) */
.table-how-to-box {
  margin-top: 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.how-to-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.how-to-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.25);
  padding: 2px 6px;
  border-radius: 4px;
  width: fit-content;
}

.how-to-header h4 {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-primary);
}

.how-to-summary {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.how-to-steps-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.how-to-step-card {
  display: flex;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px;
}

.step-num-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent-cyan);
  background: var(--bg-tertiary);
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
}

.step-card-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 0;
}

.step-card-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
}

.step-card-desc {
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ==========================================================================
   WORKBOOK SUBPANEL 3: Interactive How-To Playbooks View
   ========================================================================== */
.playbook-view-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.playbook-hero-banner {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(30, 27, 75, 0.9));
  border: 1px solid rgba(168, 85, 247, 0.3);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.playbook-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.playbook-hero-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
}

.playbook-hero-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 860px;
}

/* Playbook Navigation Switcher */
.playbook-nav-tabs {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.playbook-nav-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.playbook-nav-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.playbook-nav-btn.active.ff {
  background: rgba(234, 88, 12, 0.15);
  border-color: #ea580c;
  color: #fff;
  box-shadow: 0 0 16px rgba(234, 88, 12, 0.25);
}

.playbook-nav-btn.active.mm {
  background: rgba(168, 85, 247, 0.15);
  border-color: var(--accent-purple);
  color: #fff;
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.25);
}

.playbook-btn-title {
  font-size: 0.95rem;
  font-weight: 700;
}

.playbook-btn-sub {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* FlowForge Interactive Visual Canvas */
.interactive-flowforge-studio {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.ff-canvas-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.ff-wire-arena {
  background: #080c14;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: grid;
  grid-template-columns: 1fr auto 1.2fr auto 1fr;
  align-items: center;
  gap: 12px;
  position: relative;
  overflow-x: auto;
}

@media (max-width: 900px) {
  .ff-wire-arena {
    grid-template-columns: 1fr;
  }
}

.ff-node-box {
  background: var(--bg-secondary);
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  transition: all var(--transition-fast);
}

.ff-node-box.ingress { border-color: #38bdf8; }
.ff-node-box.function { border-color: #f59e0b; }
.ff-node-box.egress { border-color: #10b981; }

.ff-node-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 800;
  text-transform: uppercase;
}

.ff-node-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.ff-node-sub {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.ff-wire-bridge {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-amber);
  font-size: 1.4rem;
  font-weight: bold;
}

.ff-debug-panel {
  background: #040711;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

/* Mermaid Interactive Studio */
.interactive-mermaid-studio {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.mermaid-grammar-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.mm-grammar-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mm-grammar-btn:hover {
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.mm-grammar-btn.active {
  background: rgba(168, 85, 247, 0.15);
  border-color: var(--accent-purple);
  color: #e9d5ff;
}

.mermaid-split-studio {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 20px;
}

@media (max-width: 900px) {
  .mermaid-split-studio {
    grid-template-columns: 1fr;
  }
}

.mermaid-code-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mermaid-preview-box {
  background: #060a14;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 280px;
}