/* ----------------------------------------------------
   DESIGN SYSTEM & VARIABLES
---------------------------------------------------- */
:root {
  --bg-main: #0b0f19;
  --bg-surface: #111827;
  --bg-card: #1f2937;
  --bg-card-hover: #374151;
  --bg-input: #0d1322;

  --border-subtle: #1f2937;
  --border-medium: #374151;
  --border-highlight: #4b5563;

  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #8791a1;

  /* Semantic Color Palette */
  --color-doc: #94a3b8;       /* Slate / Source */
  --color-query: #3b82f6;     /* Electric Blue */
  --color-embed: #8b5cf6;     /* Deep Purple */
  --color-search: #06b6d4;    /* Cyan */
  --color-context: #10b981;   /* Emerald Green */
  --color-gen: #f59e0b;       /* Amber Gold */
  --color-warn: #ef4444;      /* Coral Red */

  --font-ui: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-code: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --nav-height: 64px;
}

/* ----------------------------------------------------
   BASE RESET & GLOBAL STYLES
---------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-ui);
  line-height: 1.6;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

.hidden {
  display: none !important;
}

button,
input,
a {
  font: inherit;
}

:where(a, button, input, [role="button"]):focus-visible {
  outline: 3px solid #93c5fd;
  outline-offset: 3px;
}

button,
.btn,
.nav-lab-btn {
  min-height: 44px;
}

/* ----------------------------------------------------
   NAVIGATION BAR
---------------------------------------------------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-medium);
}

.nav-container {
  max-width: 1440px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  background: linear-gradient(135deg, var(--color-query), var(--color-embed));
  color: #fff;
  font-weight: 800;
  font-size: 0.9rem;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  letter-spacing: 0.05em;
}

.brand-name {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.module-badge {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-lab-btn {
  background: rgba(59, 130, 246, 0.1);
  color: var(--color-query);
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  font-size: 0.875rem;
}

.nav-lab-btn:hover {
  background: rgba(59, 130, 246, 0.2);
  color: #60a5fa;
}

/* ----------------------------------------------------
   STICKY SIDEBAR PROGRESS
---------------------------------------------------- */
.sticky-progress {
  position: fixed;
  left: 2rem;
  top: calc(var(--nav-height) + 3rem);
  display: flex;
  gap: 1rem;
  z-index: 50;
}

.progress-track {
  width: 2px;
  background: var(--border-medium);
  position: relative;
  border-radius: 2px;
}

.progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, var(--color-query), var(--color-context));
  transition: height 0.2s ease-out;
}

.progress-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.progress-dot {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: all 0.2s;
}

.dot-num {
  font-family: var(--font-code);
  font-weight: 600;
}

.dot-label {
  opacity: 0;
  transform: translateX(-4px);
  transition: all 0.2s;
  white-space: nowrap;
}

.progress-dot:hover .dot-label,
.progress-dot.active .dot-label {
  opacity: 1;
  transform: translateX(0);
}

.progress-dot.active {
  color: var(--color-query);
  font-weight: 600;
}

@media (max-width: 1200px) {
  .sticky-progress {
    display: none;
  }
}

/* ----------------------------------------------------
   LAYOUT & SECTIONS
---------------------------------------------------- */
.content-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 2rem 6rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 8rem;
}

.section {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  scroll-margin-top: calc(var(--nav-height) + 2rem);
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.step-number {
  font-family: var(--font-code);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-query);
  letter-spacing: 0.1em;

}

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.section-intro {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 800px;
}

/* ----------------------------------------------------
   HERO SECTION
---------------------------------------------------- */
.hero-section {
  padding-top: 2rem;
  padding-bottom: 2rem;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
}

.section-tag {
  background: rgba(139, 92, 246, 0.15);
  color: var(--color-embed);
  border: 1px solid rgba(139, 92, 246, 0.3);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  background: linear-gradient(to right, #ffffff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.35rem;
  color: var(--text-secondary);
  max-width: 680px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.hero-flow-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 3rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  padding: 1.25rem 2rem;
  border-radius: 12px;
}

.flow-step {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.flow-arrow {
  color: var(--text-muted);
  font-weight: 700;
}

/* ----------------------------------------------------
   BUTTONS
---------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--color-query);
  color: #ffffff;
}

.btn-primary:hover {
  background: #2563eb;
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  background: var(--bg-card-hover);
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-medium);
}

.btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--border-highlight);
}

.btn-blue {
  background: var(--color-query);
  color: #fff;
}

.btn-blue:hover {
  background: #2563eb;
}

.btn-large-primary {
  padding: 1rem 2rem;
  font-size: 1.1rem;
  background: var(--color-query);
  color: #fff;
}

.btn-large-disabled {
  padding: 1rem 2rem;
  font-size: 1.1rem;
  background: var(--bg-input);
  color: var(--text-muted);
  border: 1px solid var(--border-medium);
  cursor: not-allowed;
  opacity: 0.6;
}

/* ----------------------------------------------------
   SECTION 2: PROBLEM RAG SOLVES
---------------------------------------------------- */
.interactive-comparison {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: stretch;
}

.comparison-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
}

.card-badge {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  text-transform: uppercase;
}

.badge-red {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-warn);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-context);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-neutral {
  background: rgba(148, 163, 184, 0.15);
  color: var(--color-doc);
  border: 1px solid rgba(148, 163, 184, 0.3);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.chat-bubble {
  background: var(--bg-card);
  padding: 0.85rem 1rem;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.bubble-role {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.user-bubble {
  border-left: 3px solid var(--color-query);
}

.ai-bubble.error-state {
  border-left: 3px solid var(--color-warn);
  color: #fca5a5;
}

.ai-bubble.success-state {
  border-left: 3px solid var(--color-context);
  color: #6ee7b7;
}

.subtext {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.evidence-box {
  background: rgba(16, 185, 129, 0.08);
  border: 1px dashed var(--color-context);
  padding: 0.75rem 1rem;
  border-radius: 8px;
}

.evidence-tag {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-context);
  display: block;
  margin-bottom: 0.2rem;
}

.comparison-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--text-muted);
  font-size: 1.1rem;
}

.takeaway-banner {
  background: var(--bg-surface);
  border: 1px solid var(--border-highlight);
  border-left: 4px solid var(--color-gen);
  padding: 1.25rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 1.05rem;
}

.takeaway-icon {
  display: inline-grid;
  width: 1.7rem;
  height: 1.7rem;
  place-items: center;
  border: 1px solid var(--color-gen);
  border-radius: 50%;
  color: var(--color-gen);
  font-family: var(--font-code);
  font-size: 0.8rem;
  font-weight: 800;
}

/* ----------------------------------------------------
   SECTION 3: DOCUMENTS
---------------------------------------------------- */
.documents-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.doc-viewer-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card-header {
  background: var(--bg-card);
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-medium);
  font-weight: 600;
  font-size: 0.9rem;
}

.doc-body {
  padding: 1.25rem;
  white-space: pre-wrap;
  font-family: var(--font-ui);
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.6;
}

.doc-footer-notes {
  background: var(--bg-input);
  padding: 0.85rem 1.25rem;
  border-top: 1px solid var(--border-medium);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.doc-footer-notes ul {
  padding-left: 1.2rem;
}

/* ----------------------------------------------------
   CODE CARDS & SYNTAX HIGHLIGHTING
---------------------------------------------------- */
.code-card {
  background: #090d16;
  border: 1px solid var(--border-medium);
  border-radius: 10px;
  overflow: hidden;
  font-family: var(--font-code);
}

.code-header {
  background: var(--bg-card);
  padding: 0.6rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-medium);
}

.code-lang {
  text-transform: uppercase;
  font-weight: 700;
  font-size: 0.7rem;
  color: var(--color-query);
}

.code-content {
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  line-height: 1.6;
  overflow-x: auto;
  color: #e2e8f0;
}

.code-var { color: #93c5fd; }
.code-func { color: #c084fc; }
.code-kw { color: #f472b6; }
.code-str { color: #86efac; }
.code-num { color: #fde047; font-weight: bold; }
.code-comment { color: #64748b; font-style: italic; }

/* ----------------------------------------------------
   SECTION 4: CHUNKING
---------------------------------------------------- */
.interactive-playground {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.controls-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.presets-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.control-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.preset-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-btn:hover, .preset-btn.active {
  background: var(--color-query);
  color: #fff;
  border-color: var(--color-query);
}

.sliders-grid {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1.5rem;
  align-items: center;
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
}

.slider-val {
  font-family: var(--font-code);
  font-weight: 700;
  color: var(--color-query);
}

input[type="range"] {
  width: 100%;
  min-height: 44px;
  accent-color: var(--color-query);
  cursor: pointer;
}

.toggle-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 44px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 10px; left: 0; right: 0; bottom: 10px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-medium);
  transition: .2s;
  border-radius: 24px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-secondary);
  transition: .2s;
  border-radius: 50%;
}

input:checked + .toggle-slider {
  background-color: var(--color-query);
}

input:checked + .toggle-slider:before {
  transform: translateX(20px);
  background-color: #fff;
}

.toggle-switch input:focus-visible + .toggle-slider {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.toggle-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.warning-banner {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--color-warn);
  color: #fca5a5;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chunks-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}

.chunk-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-left: 4px solid var(--color-embed);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.9rem;

}

.chunk-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--color-embed);
}

.overlap-text {
  background: rgba(245, 158, 11, 0.25);
  color: #fef08a;
  border-radius: 2px;
  padding: 0 2px;
}

.evidence-registry-card {
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-left: 4px solid var(--color-query);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.evidence-registry-label {
  color: var(--color-query);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.evidence-registry-card p {
  color: var(--text-secondary);
}

.evidence-registry-status {
  color: #bfdbfe;
  font-size: 0.85rem;
}

.evidence-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.evidence-badges:empty {
  display: none;
}

.evidence-badge {
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
}

.evidence-badge.complete {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.45);
  color: #a7f3d0;
}

.evidence-badge.fragment {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #fde68a;
}

.chunk-card.source-highlight {
  outline: 3px solid var(--color-gen);
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.6);
}

/* ----------------------------------------------------
   SECTION 5: EMBEDDINGS
---------------------------------------------------- */
.concept-transformation {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.text-vector-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.sentence-text {
  font-weight: 600;
  color: var(--text-primary);
}

.transform-arrow {
  font-size: 0.75rem;
  color: var(--color-embed);
  font-weight: 700;
}

.vector-preview {
  font-family: var(--font-code);
  font-size: 0.75rem;
  color: var(--color-search);
}

.vector-space-wrapper {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.vector-space-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.teaching-note {
  font-size: 0.8rem;
  color: var(--color-gen);
}

.vector-space-canvas-container {
  width: 100%;
  height: 380px;
  background: #090d16;
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  position: relative;
  overflow: hidden;
}

#vector-space-svg {
  width: 100%;
  height: 100%;
}

.node-point {
  cursor: pointer;
  transition: transform 0.2s, r 0.2s;
}

.node-point:hover {
  r: 9;
}

.node-label {
  font-size: 11px;
  fill: #94a3b8;
  pointer-events: none;
  font-family: var(--font-ui);
}

.tooltip {
  position: absolute;
  background: #1e293b;
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  border: 1px solid var(--border-highlight);
  pointer-events: none;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.inspector-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  padding: 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
}

/* ----------------------------------------------------
   SECTION 6: QUERY EMBEDDING
---------------------------------------------------- */
.query-vectorizer-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  padding: 1.5rem;
}

.query-input-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.input-with-button {
  display: flex;
  gap: 0.5rem;
}

.input-with-button input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 0.6rem 0.8rem;
  border-radius: 6px;
  font-size: 0.95rem;
}

.query-presets {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.presets-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.q-preset-btn {
  text-align: left;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.q-preset-btn:hover, .q-preset-btn.active {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-query);
  border-color: var(--color-query);
}

.query-transform-flow {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border-medium);
}

.query-box, .vector-box {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.3rem;
}

.q-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.q-text {
  font-weight: 700;
  color: var(--color-query);
  font-size: 1.05rem;
}

.q-vector {
  font-family: var(--font-code);
  color: var(--color-search);
  font-size: 0.85rem;
}

.arrow-down {
  color: var(--color-query);
  font-size: 1.25rem;
  font-weight: 800;
}

/* ----------------------------------------------------
   SECTION 7: SIMILARITY SEARCH
---------------------------------------------------- */
.similarity-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
}

.concept-explainer-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  font-size: 0.9rem;
}

.sim-scale {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.75rem;
  margin-top: 0.5rem;
}

.scale-bar {
  width: 100%;
  height: 6px;
  background: linear-gradient(to right, var(--color-warn), #475569, var(--color-search));
  border-radius: 3px;
}

.scale-labels {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
}

.scale-labels span {
  display: flex;
  flex-direction: column;
}

.scale-labels span:nth-child(2) {
  align-items: center;
}

.scale-labels span:last-child {
  align-items: flex-end;
  text-align: right;
}

.scale-labels small {
  color: var(--text-muted);
}

.ranking-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.rank-item-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.rank-score-badge {
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-search);
  width: 50px;
}

.rank-bar-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.rank-bar-bg {
  width: 100%;
  height: 8px;
  background: var(--bg-input);
  border-radius: 4px;
  overflow: hidden;
}

.rank-bar-fill {
  height: 100%;
  background: var(--color-search);
  transition: width 0.4s ease;
}

.rank-chunk-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ----------------------------------------------------
   SECTION 8: TOP-K RETRIEVAL
---------------------------------------------------- */
.top-k-interactive {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.top-k-controls {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.val-highlight {
  font-size: 1.2rem;
  color: var(--color-context);
}

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

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.metric-value {
  font-size: 1.1rem;
  font-weight: 700;
}

.color-green { color: var(--color-context); }
.color-amber { color: var(--color-gen); }
.color-blue { color: var(--color-query); }

.topk-list-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.topk-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  padding: 1rem;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s;
}

.topk-item.selected {
  border-left: 4px solid var(--color-context);
  background: rgba(16, 185, 129, 0.05);
}

.topk-item.excluded {
  opacity: 0.62;
  border-left: 4px solid var(--border-medium);
}

/* ----------------------------------------------------
   SECTION 9: CONTEXT
---------------------------------------------------- */
.context-assembly-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.important-note-card {
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid var(--color-query);
  border-left: 4px solid var(--color-query);
  padding: 1rem 1.25rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.95rem;
}

.context-buffer-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  overflow: hidden;
}

.context-body {
  padding: 1.25rem;
  white-space: pre-wrap;
  font-family: var(--font-code);
  font-size: 0.9rem;
  color: #a7f3d0;
  background: #090d16;
  line-height: 1.6;
}

/* ----------------------------------------------------
   SECTION 10: AUGMENTED PROMPT
---------------------------------------------------- */
.prompt-builder-view {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.prompt-blocks-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.prompt-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.block-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.block-system {
  border-left: 4px solid var(--text-secondary);
}

.block-system .block-label { color: var(--text-secondary); }

.block-context {
  border-left: 4px solid var(--color-context);
}

.block-context .block-label { color: var(--color-context); }

.block-question {
  border-left: 4px solid var(--color-query);
}

.block-question .block-label { color: var(--color-query); }

.block-preview {
  font-family: var(--font-code);
  font-size: 0.85rem;
  color: #a7f3d0;
}

.assembly-equation {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  padding: 0.85rem;
  border-radius: 8px;
  text-align: center;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-secondary);
}

.assembly-equation span {
  color: var(--text-primary);
}

/* ----------------------------------------------------
   SECTION 11: GENERATION
---------------------------------------------------- */
.generation-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.gen-flow-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  overflow: hidden;
}

.gen-header {
  background: var(--bg-card);
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-medium);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-gen);
}

.gen-body {
  padding: 1.5rem;
}

.llm-response-box {
  background: #090d16;
  border: 1px solid var(--border-medium);
  border-left: 4px solid var(--color-gen);
  border-radius: 8px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.llm-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-gen);
  text-transform: uppercase;
}

.answer-text {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.grounding-sources {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.grounding-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.source-chip {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid var(--color-gen);
  color: var(--color-gen);
  padding: 0.3rem 0.75rem;
  border-radius: 16px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.source-chip:hover {
  background: rgba(245, 158, 11, 0.3);
  transform: scale(1.03);
}

.source-chip:disabled {
  cursor: not-allowed;
  opacity: 0.65;
  transform: none;
}

/* ----------------------------------------------------
   SECTION 12: COMPLETE PIPELINE
---------------------------------------------------- */
.pipeline-architect-view {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pipeline-controls {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.architecture-diagram {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  background: #090d16;
  border: 1px solid var(--border-medium);
  border-radius: 10px;
  padding: 1.5rem;
}

.path-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.path-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.nodes-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.pipe-node {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  padding: 0.6rem 0.85rem;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all 0.3s;
}

.pipe-node.active-node {
  border-color: var(--color-query);
  background: rgba(59, 130, 246, 0.2);
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
  transform: scale(1.05);
}

.node-storage {
  border-color: var(--color-embed);
}

.pipe-arrow {
  color: var(--text-muted);
  font-weight: 700;
}

.pipeline-status-bar {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: var(--font-code);
}

/* ----------------------------------------------------
   SECTION 13: TRANSITION TO LAB
---------------------------------------------------- */
.transition-section {
  text-align: center;
}

.transition-card {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border: 1px solid var(--border-highlight);
  border-radius: 16px;
  padding: 4rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.transition-card h2 {
  font-size: 2.5rem;
  font-weight: 800;
}

.transition-sub {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
}

.future-modules-note {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.transition-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 1rem;
}

/* ----------------------------------------------------
   INTERACTIVE COSINE ANGLE VISUALIZER
---------------------------------------------------- */
.angle-visualizer-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.angle-viz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.angle-viz-header h4 {
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.angle-viz-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1.5rem;
  align-items: center;
}

.angle-canvas-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 1rem;
}

#angle-circle-svg {
  width: 100%;
  max-width: 200px;
  height: 200px;
}

.angle-details-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.angle-readout-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.angle-metric {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.angle-metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.angle-metric-val {
  font-family: var(--font-code);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-search);
}

.angle-slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.angle-formula-box {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--color-search);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-family: var(--font-code);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ----------------------------------------------------
   FAILURE MODE & GROUNDING DIAGNOSTICS
---------------------------------------------------- */
.grounding-status-banner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-top: 0.75rem;
}

.grounding-status-banner.grounded {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--color-context);
  color: #a7f3d0;
}

.grounding-status-banner.hallucination-risk {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid var(--color-warn);
  color: #fca5a5;
}

.grounding-status-banner.retrieval-miss {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid var(--color-gen);
  color: #fde68a;
}

/* ----------------------------------------------------
   FOOTER
---------------------------------------------------- */
.app-footer {
  border-top: 1px solid var(--border-medium);
  padding: 2rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--bg-surface);
}

/* ----------------------------------------------------
   RESPONSIVE DESIGN
---------------------------------------------------- */
@media (max-width: 1000px) {
  .angle-viz-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .documents-layout,
  .interactive-comparison,
  .query-vectorizer-box,
  .similarity-layout {
    grid-template-columns: 1fr;
  }

  .comparison-divider {
    padding: 0.5rem 0;
  }

  .concept-transformation {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .sliders-grid {
    grid-template-columns: 1fr;
  }
}

/* ----------------------------------------------------
   NARRATIVE LEARNING SYSTEM
---------------------------------------------------- */
.mobile-progress {
  display: none;
}

.hero-module {
  color: var(--text-muted);
  font-family: var(--font-code);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.content-wrapper {
  gap: 5.5rem;
}

.content-wrapper,
.section,
.documents-layout > *,
.query-vectorizer-box > *,
.similarity-layout > *,
.prompt-assembly > *,
.rank-bar-wrapper,
.topk-item > div {
  min-width: 0;
}

pre,
svg {
  max-width: 100%;
}

.phase-start {
  margin-top: 4rem;
}

.phase-eyebrow {
  width: 100%;
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--border-medium);
  color: var(--text-muted);
}

.phase-eyebrow span {
  font-family: var(--font-code);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.phase-eyebrow strong {
  color: var(--text-primary);
  font-size: 0.84rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.phase-eyebrow small {
  justify-self: end;
  font-size: 0.8rem;
}

.section-header h2 {
  max-width: 850px;
}

.section-intro {
  max-width: 70ch;
}

.code-header small {
  margin-left: 0.45rem;
  color: var(--text-muted);
  font-family: var(--font-ui);
  font-weight: 400;
}

.code-line {
  display: block;
  margin: 0 -0.35rem;
  padding: 0 0.35rem;
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.is-updating {
  animation: update-flash 0.22s ease-out;
}

@keyframes update-flash {
  0% { background-color: rgba(59, 130, 246, 0); }
  45% { background-color: rgba(59, 130, 246, 0.24); }
  100% { background-color: rgba(59, 130, 246, 0); }
}

/* Brand and first-view learning path */
.brand-logo {
  background: var(--color-query);
  min-width: 36px;
  text-align: center;
}

.module-badge {
  border-radius: 999px;
}

.hero-title {
  font-size: clamp(3rem, 5vw, 3.5rem);
  background: none;
  -webkit-text-fill-color: currentColor;
}

.hero-flow-preview {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0;
  padding: 0;
  background: transparent;
  border: 0;
}

.flow-step {
  position: relative;
  min-width: 0;
  min-height: 78px;
  justify-content: center;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.8rem 0.45rem;
  background: var(--bg-surface);
  border-block: 1px solid var(--border-medium);
}

.flow-step:first-child {
  border-left: 1px solid var(--border-medium);
  border-radius: 10px 0 0 10px;
}

.flow-step:last-child {
  border-right: 1px solid var(--border-medium);
  border-radius: 0 10px 10px 0;
}

.flow-step:not(:last-child)::after {
  content: "→";
  position: absolute;
  z-index: 1;
  right: -0.5rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.step-icon,
.header-symbol,
.node-icon {
  min-width: 2.2rem;
  font-family: var(--font-code);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-align: center;
}

.flow-doc .step-icon { color: var(--color-doc); }
.flow-embed .step-icon { color: var(--color-embed); }
.flow-search .step-icon { color: var(--color-search); }
.flow-context .step-icon { color: var(--color-context); }
.flow-gen .step-icon { color: var(--color-gen); }

/* Persistent evidence identity */
.evidence-identity {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 0.35rem;
  padding: 0.15rem 0.48rem;
  border: 1px solid rgba(249, 250, 251, 0.42);
  border-radius: 999px;
  color: var(--text-primary);
  background: rgba(249, 250, 251, 0.06);
  font-family: var(--font-code);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.evidence-identity::before {
  content: "◆";
  font-size: 0.55rem;
}

.evidence-box {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.35rem 0.6rem;
}

.evidence-box p {
  grid-column: 1 / -1;
}

.doc-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  white-space: normal;
}

.document-evidence {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.75rem;
  margin-inline: -0.75rem;
  border-block: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(148, 163, 184, 0.06);
}

.document-evidence mark,
.evidence-text-mark {
  background: transparent;
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: rgba(249, 250, 251, 0.5);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* Chunking should read like one text stream being cut */
.chunks-container {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border-medium);
  border-radius: 10px;
  background: #090d16;
  overflow: hidden;
}

.chunk-card {
  position: relative;
  border: 0;
  border-left: 4px solid var(--color-embed);
  border-radius: 0;
  background: transparent;
  padding: 1.1rem 1.25rem;
  line-height: 1.7;
}

.chunk-card + .chunk-card {
  border-top: 0;
}

.chunk-boundary {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-code);
  font-size: 0.7rem;
}

.chunk-boundary::before,
.chunk-boundary::after {
  content: "";
  border-top: 1px dashed var(--color-embed);
}

.overlap-preview {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  margin-top: 0.55rem;
  padding: 0.55rem 0.7rem;
  border-left: 2px solid var(--color-gen);
  background: rgba(245, 158, 11, 0.08);
  color: #fde68a;
  font-family: var(--font-code);
  font-size: 0.76rem;
}

.overlap-preview strong {
  flex: 0 0 auto;
  text-transform: uppercase;
  font-size: 0.66rem;
  letter-spacing: 0.05em;
}

.chunk-card.source-highlight {
  outline: 3px solid var(--color-gen);
  outline-offset: -3px;
  box-shadow: none;
}

/* Embedding transformation and point language */
.concept-transformation {
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
}

.transform-source,
.transform-result {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.1rem 1.25rem;
  border-block: 1px solid var(--border-medium);
  background: var(--bg-surface);
}

.transform-source { border-left: 3px solid var(--color-doc); }
.transform-result { border-right: 3px solid var(--color-embed); }
.transform-kicker { color: var(--text-muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; }
.transform-result code { color: #c4b5fd; overflow-wrap: anywhere; }
.transform-result small { color: var(--text-muted); }

.transform-operation {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem;
  color: var(--color-embed);
  font-family: var(--font-code);
  font-size: 0.78rem;
}

.node-point:focus-visible {
  outline: none;
  stroke: #fff;
  stroke-width: 4px;
}

.node-point.is-selected {
  stroke: var(--color-search);
  stroke-width: 4px;
}

.evidence-point-ring {
  fill: none;
  stroke: #f9fafb;
  stroke-width: 1.5;
  stroke-dasharray: 3 2;
  pointer-events: none;
}

.inspector-vector { color: var(--color-search); }
.inspector-copy { margin-top: 0.4rem; color: #cbd5e1; }

/* Query and comparison */
.q-preset-out-of-domain {
  border-style: dashed;
  border-color: rgba(239, 68, 68, 0.55);
  color: #fca5a5;
}

.results-heading {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.results-heading span,
.projection-label,
.angle-comparison-label,
.sandbox-note {
  color: var(--text-muted);
  font-size: 0.78rem;
}

button.rank-item-card {
  width: 100%;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.rank-item-card.is-compared {
  border-color: var(--color-search);
  background: rgba(6, 182, 212, 0.06);
}

.rank-heading,
.topk-heading {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 0.8rem;
}

.rank-meta,
.topk-copy {
  color: var(--text-muted);
}

.topk-copy { margin-top: 0.3rem; font-size: 0.85rem; }
.angle-status { font-size: 1.05rem; color: var(--color-context); }
.angle-slider-header { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.85rem; }
.sandbox-note { margin-top: 0.35rem; }

.topk-cutoff {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.7rem;
  color: var(--color-context);
  font-family: var(--font-code);
  font-size: 0.72rem;
  font-weight: 700;
}

.topk-cutoff::before,
.topk-cutoff::after { content: ""; border-top: 1px dashed var(--color-context); }

.retrieval-state {
  flex: 0 0 auto;
  color: var(--text-muted);
  font-size: 0.76rem;
  font-weight: 800;
}

.topk-item.selected .retrieval-state { color: var(--color-context); }

/* Context collection and prompt assembly */
.context-collection {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1.25rem;
}

.collection-label {
  display: block;
  margin-bottom: 0.65rem;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.context-selected-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.context-unit {
  min-width: 180px;
  flex: 1 1 220px;
  padding: 0.75rem;
  border-top: 3px solid var(--color-context);
  background: var(--bg-surface);
}

.context-unit strong { display: block; font-size: 0.78rem; }
.context-unit p { margin-top: 0.35rem; color: var(--text-secondary); font-size: 0.78rem; }
.collection-arrow { color: var(--color-context); font-size: 1.5rem; }

.context-body {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  white-space: normal;
}

.context-entry {
  padding-left: 0.85rem;
  border-left: 2px solid var(--color-context);
}

.context-entry strong { display: block; margin-bottom: 0.25rem; color: #a7f3d0; font-size: 0.76rem; }
.context-entry p { color: #d1fae5; }

.prompt-assembly {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 72px minmax(180px, 0.38fr);
  align-items: stretch;
  gap: 1rem;
}

.assembly-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-context);
  font-size: 1.4rem;
}

.prompt-payload {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
  padding: 1.25rem;
  border-block: 1px solid var(--border-medium);
  border-right: 4px solid var(--color-gen);
  background: #090d16;
}

.prompt-payload span { color: var(--text-muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; }
.prompt-payload small { color: var(--text-secondary); }
.block-preview { white-space: normal; }

/* Answer-to-evidence relationship */
.gen-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.gen-header b { color: var(--text-muted); }

.answer-evidence {
  display: grid;
  gap: 0.55rem;
  padding: 1rem;
  border-block: 1px solid rgba(249, 250, 251, 0.24);
  background: rgba(249, 250, 251, 0.035);
}

.answer-evidence > div {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.answer-evidence blockquote { color: #fef3c7; font-size: 0.95rem; }
.answer-evidence > span { color: var(--text-muted); font-size: 0.78rem; }

.source-detail {
  padding: 0.85rem 1rem;
  border-left: 2px solid var(--color-gen);
  background: rgba(245, 158, 11, 0.08);
}

.source-detail p { margin-top: 0.35rem; color: var(--text-secondary); }
.source-detail:focus-visible { outline: 3px solid #fde68a; outline-offset: 3px; }
.source-chip:hover { transform: none; }
.status-symbol { font-family: var(--font-code); font-weight: 800; }

/* Connected pipeline synthesis */
.scroll-hint {
  display: none;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.vector-scroll-hint {
  margin-bottom: -0.45rem;
}

.architecture-diagram { gap: 1.15rem; }
.nodes-row { align-items: stretch; }

.pipe-node {
  min-width: 128px;
  min-height: 82px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  white-space: normal;
  transition: border-color 0.2s ease, background-color 0.2s ease, opacity 0.2s ease;
}

.pipe-node.node-doc { border-top: 3px solid var(--color-doc); }
.pipe-node.node-embed { border-top: 3px solid var(--color-embed); }
.pipe-node.node-query { border-top: 3px solid var(--color-query); }
.pipe-node.node-search { border-top: 3px solid var(--color-search); }
.pipe-node.node-context { border-top: 3px solid var(--color-context); }
.pipe-node.node-gen { border-top: 3px solid var(--color-gen); }

.pipeline-evidence {
  display: none;
  margin-top: 0.2rem;
  color: var(--text-secondary);
  font-family: var(--font-code);
  font-size: 0.62rem;
  line-height: 1.3;
}

.pipe-node.completed-node .pipeline-evidence,
.pipe-node.current-node .pipeline-evidence { display: block; }

.pipe-node.upcoming-node { opacity: 0.48; }
.pipe-node.completed-node { border-color: var(--color-context); background: rgba(16, 185, 129, 0.08); }
.pipe-node.current-node { border-color: #fff; background: rgba(59, 130, 246, 0.16); }

.store-bridge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--color-search);
  font-family: var(--font-code);
  font-size: 0.72rem;
}

.transition-card {
  background: var(--bg-surface);
}

.coming-next-note {
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* Responsive orientation */
@media (min-width: 1201px) and (max-width: 1320px) {
  .sticky-progress { left: 0.75rem; }
  .dot-label { display: none; }
  .content-wrapper { max-width: 1050px; }
}

@media (max-width: 1200px) {
  :root { --nav-height: 92px; }

  .navbar { height: var(--nav-height); }
  .nav-container { height: 64px; }

  .mobile-progress {
    position: absolute;
    inset: auto 0 0;
    height: 28px;
    display: grid;
    grid-template-columns: minmax(120px, auto) 1fr;
    align-items: center;
    gap: 0.8rem;
    padding: 0 2rem;
    background: #0b0f19;
    border-top: 1px solid var(--border-subtle);
  }

  .mobile-progress-label {
    max-width: 36vw;
    overflow: hidden;
    color: var(--text-secondary);
    font-size: 0.72rem;
    font-weight: 600;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .mobile-progress-track {
    height: 2px;
    overflow: hidden;
    background: var(--border-medium);
  }

  #mobile-progress-fill {
    display: block;
    width: 0;
    height: 100%;
    background: var(--color-query);
    transition: width 0.2s ease;
  }

  .section { scroll-margin-top: calc(var(--nav-height) + 1.25rem); }
  .scroll-hint { display: block; }
}

@media (max-width: 900px) {
  .content-wrapper { gap: 4.5rem; padding-inline: 1.5rem; }
  .phase-start { margin-top: 3rem; }
  .phase-eyebrow { grid-template-columns: auto 1fr; }
  .phase-eyebrow small { grid-column: 1 / -1; justify-self: start; }
  .hero-flow-preview { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--border-medium); border: 1px solid var(--border-medium); border-radius: 10px; overflow: hidden; }
  .flow-step { border: 0; border-radius: 0 !important; }
  .flow-step:not(:last-child)::after { display: none; }
  .prompt-assembly { grid-template-columns: 1fr; }
  .assembly-connector { transform: rotate(90deg); min-height: 36px; }
  .prompt-payload { border-right: 0; border-bottom: 4px solid var(--color-gen); }
  .context-collection { grid-template-columns: 1fr; }
  .collection-arrow { transform: rotate(90deg); justify-self: center; }
  .metrics-row { grid-template-columns: 1fr; }
  .topk-item { align-items: flex-start; gap: 0.75rem; }
  .grounding-sources { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 700px) {
  .nav-container { padding-inline: 1rem; }
  .nav-brand { gap: 0.55rem; }
  .module-badge { display: none; }
  .brand-name { font-size: 0.95rem; }
  .nav-links { gap: 0.6rem; }
  .nav-lab-btn { padding-inline: 0.65rem; }
  .nav-lab-wide { display: none; }
  .mobile-progress { padding-inline: 1rem; }
  .content-wrapper { padding: 2rem 1rem 5rem; }
  .section { gap: 1.5rem; }
  .section-header h2 { font-size: clamp(1.75rem, 8vw, 2rem); }
  .section-intro { font-size: 1rem; }
  .hero-title { font-size: clamp(2.25rem, 11vw, 2.75rem); }
  .hero-subtitle { font-size: 1.08rem; }
  .hero-actions { width: 100%; flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-flow-preview { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .documents-layout { gap: 1rem; }
  .card-header { align-items: flex-start; gap: 0.75rem; flex-direction: column; }
  .sliders-grid { gap: 1rem; }
  .input-with-button { flex-direction: column; }
  .input-with-button .btn { width: 100%; }
  .concept-transformation { grid-template-columns: 1fr; }
  .transform-operation { justify-content: center; }
  .transform-operation b { transform: rotate(90deg); }
  .vector-space-wrapper { padding: 1rem; }
  .vector-scroll-hint { display: block; }
  .vector-space-canvas-container { height: 310px; overflow-x: auto; }
  #vector-space-svg { min-width: 620px; }
  .rank-item-card { align-items: flex-start; flex-direction: column; }
  .rank-score-badge { width: auto; }
  .rank-heading, .results-heading { align-items: flex-start; flex-direction: column; }
  .angle-visualizer-card, .pipeline-architect-view { padding: 1rem; }
  .angle-readout-row { align-items: stretch; flex-direction: column; gap: 0.65rem; }
  .angle-metric { width: 100%; }
  .angle-slider-header { flex-direction: column; gap: 0.25rem; }
  .pipeline-controls { display: grid; grid-template-columns: 1fr; }
  .pipeline-controls .btn { width: 100%; }
  .architecture-diagram { padding: 1rem; }
  .transition-card { padding: 2.5rem 1rem; }
  .transition-card h2 { font-size: 2rem; }
  .btn-large-primary { width: 100%; }
}

@media (max-width: 430px) {
  .brand-name { max-width: 106px; line-height: 1.05; }
  .nav-link:not(.nav-lab-btn) { display: none; }
  .mobile-progress { grid-template-columns: 110px 1fr; }
  .mobile-progress-label { max-width: 110px; }
  .phase-eyebrow { gap: 0.45rem; }
  .phase-eyebrow strong { font-size: 0.76rem; }
  .presets-row { align-items: stretch; flex-direction: column; }
  .preset-btn { width: 100%; }
  .query-presets { gap: 0.55rem; }
  .q-preset-btn { min-height: 44px; }
  .document-evidence { flex-direction: column; }
  .context-unit { min-width: 0; flex-basis: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}