/* =====================================================
   AI Academy — tsingular.ru integrated styles
   All rules scoped under .edu-wrapper to avoid pollution.
   Dark-mode via html.dark .edu-wrapper
   ===================================================== */

/* ---------- CSS Variables ---------- */
.edu-wrapper {
  --edu-primary: #1B3A5C;
  --edu-primary-hover: #0F2A45;
  --edu-accent: #60A5FA;
  --edu-text: #1A1A1A;
  --edu-text-secondary: #6B7280;
  --edu-bg: #FFFFFF;
  --edu-bg-alt: #F9FAFB;
  --edu-bg-input: #F3F4F6;
  --edu-border: #E5E7EB;
  --edu-border-light: #F3F4F6;
  --edu-code-bg: #1E293B;
  --edu-code-text: #E2E8F0;
  --edu-success: #16A34A;
  --edu-success-bg: #DCFCE7;
  --edu-error: #DC2626;
  --edu-error-bg: #FEE2E2;
  --edu-warning-bg: #FEF3C7;
  --edu-hint-bg: #EFF6FF;
  --edu-hint-border: #1B3A5C;
  --edu-radius: 1rem;
  --edu-radius-lg: 1.5rem;
  --edu-shadow: 0 1px 3px rgba(0,0,0,0.06);
  --edu-shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

.dark .edu-wrapper {
  --edu-primary: #60A5FA;
  --edu-primary-hover: #93C5FD;
  --edu-accent: #1B3A5C;
  --edu-text: #E2E8F0;
  --edu-text-secondary: #94A3B8;
  --edu-bg: #1E293B;
  --edu-bg-alt: #0F172A;
  --edu-bg-input: #334155;
  --edu-border: #334155;
  --edu-border-light: #1E293B;
  --edu-code-bg: #0F172A;
  --edu-code-text: #E2E8F0;
  --edu-success-bg: #052E16;
  --edu-error-bg: #450A0A;
  --edu-warning-bg: #422006;
  --edu-hint-bg: #0C1929;
  --edu-hint-border: #60A5FA;
  --edu-shadow: 0 1px 3px rgba(0,0,0,0.2);
  --edu-shadow-md: 0 4px 12px rgba(0,0,0,0.3);
}

/* ---------- Base Container ---------- */
.edu-wrapper {
  color: var(--edu-text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.7;
  font-size: 1rem;
}

.edu-wrapper *, .edu-wrapper *::before, .edu-wrapper *::after {
  box-sizing: border-box;
}

/* ---------- Main Tab Navigation ---------- */
.edu-tabs-nav {
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--edu-border);
  margin-bottom: 2rem;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.edu-tabs-nav::-webkit-scrollbar { display: none; }

.edu-wrapper .tab-link {
  flex-shrink: 0;
  padding: 0.875rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--edu-text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
  background: none;
  border-top: none; border-left: none; border-right: none;
  list-style: none;
}

.edu-wrapper .tab-link:hover {
  color: var(--edu-primary);
}

.edu-wrapper .tab-link.active {
  color: var(--edu-primary);
  border-bottom-color: var(--edu-primary);
}

/* ---------- Tab Content ---------- */
.edu-wrapper .tab-content {
  display: none;
  animation: eduFadeUp 0.4s ease;
}
.edu-wrapper .tab-content.active {
  display: block;
}

@keyframes eduFadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Tab intro */
.edu-wrapper .tab-intro {
  margin-bottom: 2rem;
}

.edu-wrapper .tab-description {
  background: var(--edu-hint-bg);
  border-left: 4px solid var(--edu-hint-border);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--edu-radius) var(--edu-radius) 0;
  margin-bottom: 1.5rem;
  color: var(--edu-text);
}

.edu-wrapper .tab-description p { margin: 0; }

/* ---------- Subtab Pills ---------- */
.edu-wrapper .subtabs,
.edu-wrapper .subtabs-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding: 0;
  position: static;
  background: none;
  border: none;
  width: auto;
  max-width: none;
  height: auto;
}

.edu-wrapper .subtab-link {
  background: var(--edu-bg-input);
  border: 1px solid var(--edu-border);
  padding: 0.5rem 1.25rem;
  border-radius: 9999px;
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--edu-text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.edu-wrapper .subtab-link:hover {
  background: var(--edu-border);
  color: var(--edu-text);
}

.edu-wrapper .subtab-link.active {
  background: var(--edu-primary);
  color: #fff;
  border-color: var(--edu-primary);
}

.dark .edu-wrapper .subtab-link.active {
  background: var(--edu-primary);
  color: #0F172A;
}

/* ---------- Subtab Content ---------- */
.edu-wrapper .subtab-content {
  display: none;
  position: relative;
  animation: eduFadeUp 0.3s ease;
}
.edu-wrapper .subtab-content.active {
  display: block;
}

/* ---------- Tutorial Navigation ---------- */
.edu-wrapper .tutorial-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--edu-border-light);
  padding-bottom: 0.75rem;
  position: static;
  background: none;
  width: auto;
  max-width: none;
  height: auto;
  z-index: auto;
}

.edu-wrapper .tutorial-nav-btn {
  background: none;
  border: none;
  color: var(--edu-text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.5rem 0.75rem;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  border-radius: 0;
  white-space: nowrap;
}

.edu-wrapper .tutorial-nav-btn:hover {
  color: var(--edu-primary);
}

.edu-wrapper .tutorial-nav-btn.active {
  color: var(--edu-primary);
  border-bottom-color: var(--edu-primary);
  background: none;
  box-shadow: none;
  transform: none;
  z-index: auto;
  position: static;
}

/* ---------- Tutorial Sections ---------- */
.edu-wrapper .tutorial-section {
  display: none;
  animation: eduFadeUp 0.3s ease;
}
.edu-wrapper .tutorial-section.active {
  display: block;
}

.edu-wrapper .tutorial-text {
  margin-bottom: 1.5rem;
  line-height: 1.8;
}
.edu-wrapper .tutorial-text p { margin-bottom: 0.75rem; }
.edu-wrapper .tutorial-text ul,
.edu-wrapper .tutorial-text ol {
  margin-left: 1.25rem;
  margin-bottom: 0.75rem;
}
.edu-wrapper .tutorial-text li { margin-bottom: 0.375rem; }

.edu-wrapper .tutorial-text h3 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--edu-primary);
  margin: 0 0 0.75rem 0;
}

.edu-wrapper .tutorial-text h4,
.edu-wrapper .tutorial-section h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--edu-text);
  margin: 1rem 0 0.5rem;
}

.edu-wrapper .tutorial-section h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--edu-primary);
  margin: 0 0 1rem 0;
}

.edu-wrapper .tutorial-section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--edu-primary);
  margin: 0 0 1rem 0;
}

.edu-wrapper .tutorial-section p {
  margin-bottom: 0.75rem;
}

.edu-wrapper .tutorial-section ul,
.edu-wrapper .tutorial-section ol {
  margin-left: 1.25rem;
  margin-bottom: 0.75rem;
}

.edu-wrapper .tutorial-section li { margin-bottom: 0.375rem; }

/* ---------- Concept Visualization ---------- */
.edu-wrapper .concept-visualization {
  margin: 1.5rem 0;
  border-radius: var(--edu-radius);
  overflow: hidden;
}
.edu-wrapper .concept-visualization > p { text-align: center; font-size: 0.875rem; color: var(--edu-text-secondary); margin-top: 0.5rem; }

/* ---------- Application Cards Grid ---------- */
.edu-wrapper .application-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.edu-wrapper .application-card {
  background: var(--edu-bg-alt);
  border: 1px solid var(--edu-border);
  border-radius: var(--edu-radius);
  padding: 1.25rem;
  transition: transform 0.15s, box-shadow 0.15s;
}
.edu-wrapper .application-card:hover { transform: translateY(-2px); box-shadow: var(--edu-shadow-md); }
.edu-wrapper .application-card h3 { font-size: 1.05rem; font-weight: 600; color: var(--edu-primary); margin: 0 0 0.5rem; }
.edu-wrapper .application-card p { font-size: 0.9rem; color: var(--edu-text-secondary); margin: 0; }

/* ---------- Info Card ---------- */
.edu-wrapper .info-card {
  background: var(--edu-hint-bg);
  border-left: 4px solid var(--edu-hint-border);
  border-radius: var(--edu-radius);
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  color: var(--edu-text);
}

/* ---------- Dark-mode overrides for inline-styled tutorial content ---------- */
/* These HTML files use hardcoded light backgrounds/colors via inline style="..." */
/* We override them with !important only in dark mode to keep light mode intact */

.dark .edu-wrapper .tutorial-text div[style*="background-color"] {
  background-color: var(--edu-bg-alt) !important;
  color: var(--edu-text) !important;
}

/* Info boxes with left border (blue, green, yellow, orange) */
.dark .edu-wrapper .tutorial-text div[style*="border-left"] {
  background-color: var(--edu-bg-alt) !important;
  color: var(--edu-text) !important;
}

/* Cards inside grids */
.dark .edu-wrapper .tutorial-text div[style*="box-shadow"] {
  background-color: var(--edu-bg) !important;
  box-shadow: var(--edu-shadow-md) !important;
}

/* Override border colors on child elements */
.dark .edu-wrapper .tutorial-text div[style*="border: 1px solid #eaeaea"],
.dark .edu-wrapper .tutorial-text div[style*="border: 1px solid #dce0e3"] {
  border-color: var(--edu-border) !important;
}
.dark .edu-wrapper .tutorial-text div[style*="border-bottom: 1px solid #eaeaea"],
.dark .edu-wrapper .tutorial-text div[style*="border-top: 1px solid #eaeaea"] {
  border-color: var(--edu-border) !important;
}

/* Heading colors in inline-styled blocks – keep accent colors readable */
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color"] {
  color: var(--edu-primary) !important;
}
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color: #2980b9"] { color: #60A5FA !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color: #27ae60"] { color: #4ADE80 !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color: #d35400"] { color: #FB923C !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color: #e74c3c"] { color: #F87171 !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color: #2c3e50"] { color: var(--edu-text) !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color: #3498db"] { color: #60A5FA !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color: #9b59b6"] { color: #C084FC !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color: #2ecc71"] { color: #4ADE80 !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] h4[style*="color: #e67e22"] { color: #FBBF24 !important; }

/* Paragraph text colors inside inline-styled blocks */
.dark .edu-wrapper .tutorial-text div[style*="background-color"] p[style*="color: #555"] { color: var(--edu-text-secondary) !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] p[style*="color: #2980b9"] { color: #60A5FA !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] p[style*="color: #27ae60"] { color: #4ADE80 !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] p[style*="color: #d35400"] { color: #FB923C !important; }
.dark .edu-wrapper .tutorial-text div[style*="background-color"] p[style*="color: #e67e22"] { color: #FBBF24 !important; }

/* Nested card heading colors (h4 inside div inside grid without explicit bg) */
.dark .edu-wrapper .tutorial-text h4[style*="color: #3498db"] { color: #60A5FA !important; }
.dark .edu-wrapper .tutorial-text h4[style*="color: #9b59b6"] { color: #C084FC !important; }
.dark .edu-wrapper .tutorial-text h4[style*="color: #2ecc71"] { color: #4ADE80 !important; }
.dark .edu-wrapper .tutorial-text h4[style*="color: #e67e22"] { color: #FBBF24 !important; }
.dark .edu-wrapper .tutorial-text h4[style*="color: #e74c3c"] { color: #F87171 !important; }
.dark .edu-wrapper .tutorial-text h4[style*="color: #2980b9"] { color: #60A5FA !important; }
.dark .edu-wrapper .tutorial-text h4[style*="color: #27ae60"] { color: #4ADE80 !important; }
.dark .edu-wrapper .tutorial-text h4[style*="color: #d35400"] { color: #FB923C !important; }
.dark .edu-wrapper .tutorial-text h4[style*="color: #2c3e50"] { color: var(--edu-text) !important; }
.dark .edu-wrapper .tutorial-text p[style*="color: #555"] { color: var(--edu-text-secondary) !important; }
.dark .edu-wrapper .tutorial-text p[style*="color: #e67e22"] { color: #FBBF24 !important; }
.dark .edu-wrapper .tutorial-text p[style*="color: #3498db"] { color: #60A5FA !important; }
.dark .edu-wrapper .tutorial-text p[style*="color: #d35400"] { color: #FB923C !important; }
.dark .edu-wrapper .tutorial-text p[style*="color: #27ae60"] { color: #4ADE80 !important; }

/* Border bottom overrides for divs used as separators */
.dark .edu-wrapper .tutorial-text h4[style*="border-bottom: 1px solid"] {
  border-bottom-color: var(--edu-border) !important;
}

/* ---------- Interactive Demos ---------- */
.edu-wrapper .interactive-demo,
.edu-wrapper .demo-container {
  background: var(--edu-bg-alt);
  border: 1px solid var(--edu-border);
  border-radius: var(--edu-radius);
  padding: 1.25rem;
  margin: 1rem 0;
}

.edu-wrapper .demo-visualization {
  margin-top: 1rem;
  border: 1px solid var(--edu-border);
  border-radius: var(--edu-radius);
  overflow: hidden;
  background: var(--edu-bg);
  padding: 1.25rem;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.3s ease, padding 0.3s ease;
}
.edu-wrapper .demo-visualization.active {
  max-height: 2000px;
  opacity: 1;
}

/* ---------- Inputs & Buttons ---------- */
.edu-wrapper input[type="text"],
.edu-wrapper input[type="number"],
.edu-wrapper textarea,
.edu-wrapper select {
  padding: 0.625rem 0.875rem;
  border-radius: 0.625rem;
  border: 1px solid var(--edu-border);
  background: var(--edu-bg);
  color: var(--edu-text);
  font-size: 0.9375rem;
  font-family: inherit;
  transition: border-color 0.2s;
  margin: 0.25rem;
}
.edu-wrapper input:focus,
.edu-wrapper textarea:focus,
.edu-wrapper select:focus {
  outline: none;
  border-color: var(--edu-primary);
}

.edu-wrapper textarea {
  width: 100%;
  min-height: 80px;
  resize: vertical;
}

.edu-wrapper button,
.edu-wrapper .btn,
.edu-wrapper .demo-btn,
.edu-wrapper .action-btn {
  padding: 0.625rem 1.25rem;
  border-radius: 0.625rem;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  background: var(--edu-primary);
  color: #fff;
  font-family: inherit;
}
.edu-wrapper button:hover,
.edu-wrapper .btn:hover,
.edu-wrapper .demo-btn:hover,
.edu-wrapper .action-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.edu-wrapper .btn-primary {
  background: var(--edu-primary);
  color: #fff;
}

.edu-wrapper .btn-outline {
  background: transparent;
  border: 2px solid var(--edu-primary);
  color: var(--edu-primary);
}
.edu-wrapper .btn-outline:hover {
  background: var(--edu-primary);
  color: #fff;
}

.dark .edu-wrapper button,
.dark .edu-wrapper .btn,
.dark .edu-wrapper .demo-btn {
  color: #0F172A;
}
.dark .edu-wrapper .btn-outline {
  color: var(--edu-primary);
  background: transparent;
}
.dark .edu-wrapper .btn-outline:hover {
  background: var(--edu-primary);
  color: #0F172A;
}

/* ---------- Input Groups ---------- */
.edu-wrapper .input-container,
.edu-wrapper .edu-input-group {
  background: var(--edu-bg-alt);
  border: 1px solid var(--edu-border);
  padding: 1.25rem;
  border-radius: var(--edu-radius-lg);
  margin-bottom: 1.5rem;
}

.edu-wrapper .input-flat {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  border: 1px solid var(--edu-border);
  background: var(--edu-bg);
  color: var(--edu-text);
  font-size: 0.9375rem;
  transition: border-color 0.2s;
}
.edu-wrapper .input-flat:focus {
  outline: none;
  border-color: var(--edu-primary);
}

/* ---------- Cards ---------- */
.edu-wrapper .edu-card,
.edu-wrapper .topic-card {
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
  padding: 1.5rem;
  border-radius: var(--edu-radius-lg);
  transition: transform 0.2s, box-shadow 0.2s;
}
.edu-wrapper .edu-card:hover,
.edu-wrapper .topic-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--edu-shadow-md);
}

.edu-wrapper .topic-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--edu-text);
  margin: 0 0 0.5rem;
}

.edu-wrapper .topic-description {
  color: var(--edu-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 0.75rem;
}
.edu-wrapper .topic-description p { margin: 0; }

.edu-wrapper .topic-actions {
  margin-top: 0.75rem;
}

.edu-wrapper .course-topics,
.edu-wrapper .course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

/* ---------- Viz Areas ---------- */
.edu-wrapper .viz-area,
.edu-wrapper .visualization,
.edu-wrapper .plot-container {
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
  border-radius: var(--edu-radius);
  overflow: hidden;
  position: relative;
  margin-bottom: 1rem;
}

.edu-wrapper .viz-area {
  height: 450px;
  margin-top: 1.5rem;
}

.edu-wrapper #plot-container-tab1,
.edu-wrapper #plot-container-tab2-3d,
.edu-wrapper #plot-container-tab2-2d,
.edu-wrapper #plot-container-tab3,
.edu-wrapper #plot-container-tab3-2d,
.edu-wrapper #cosine-similarity-plot,
.edu-wrapper #pca-plot-2d,
.edu-wrapper #pca-plot-3d,
.edu-wrapper #clustering-plot,
.edu-wrapper #analogy-visualization,
.edu-wrapper #intro-demo-plot {
  width: 100%;
  height: 400px;
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
  border-radius: 0.5rem;
  position: relative;
}

.edu-wrapper .plot-row {
  display: flex;
  gap: 1rem;
}
.edu-wrapper .plot-row > div {
  flex: 1;
}

/* ---------- Results & Vector Display ---------- */
.edu-wrapper .results-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.edu-wrapper .results-container-vertical {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.edu-wrapper .vector-display,
.edu-wrapper .cluster-display,
.edu-wrapper .nearest-pairs,
.edu-wrapper .distance-matrix {
  background: var(--edu-bg-alt);
  border: 1px solid var(--edu-border);
  padding: 1rem;
  border-radius: var(--edu-radius);
  min-height: 100px;
}

.edu-wrapper .vector {
  margin-bottom: 0.75rem;
  padding: 0.75rem;
  background: var(--edu-bg);
  border-radius: 0.5rem;
  border-left: 4px solid var(--edu-primary);
}
.edu-wrapper .vector h4 {
  margin-bottom: 0.5rem;
  color: var(--edu-text);
  font-size: 1rem;
}

.edu-wrapper .vector-data {
  font-family: 'Fira Code', 'Consolas', monospace;
  background: var(--edu-bg-input);
  padding: 0.5rem;
  border-radius: 0.25rem;
  overflow-x: auto;
  font-size: 0.8125rem;
  color: var(--edu-text);
}

.edu-wrapper .similarity {
  background: var(--edu-hint-bg);
  padding: 0.75rem;
  border-radius: 0.5rem;
  margin-top: 0.75rem;
}

.edu-wrapper .similarity-info {
  background: var(--edu-bg-alt);
  border: 1px solid var(--edu-border);
  padding: 0.625rem 1rem;
  border-radius: 0.5rem;
  margin: 1rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.edu-wrapper .similarity-result {
  margin: 0.75rem 0;
  text-align: center;
}
.edu-wrapper .similarity-value {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--edu-primary);
}

/* ---------- Vector Inputs ---------- */
.edu-wrapper .vector-inputs {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.75rem;
}
.edu-wrapper .vector-input {
  flex: 1;
  min-width: 160px;
}
.edu-wrapper .vector-input h5 {
  margin: 0 0 0.375rem;
  color: var(--edu-primary);
  font-size: 0.875rem;
}
.edu-wrapper .coord-inputs {
  display: flex;
  gap: 0.5rem;
}
.edu-wrapper .coord-input {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}
.edu-wrapper .coord-input label {
  font-size: 0.8125rem;
  color: var(--edu-text-secondary);
}
.edu-wrapper .coord-input input {
  width: 60px;
  padding: 0.25rem 0.375rem;
}
.edu-wrapper .vector-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}
.edu-wrapper .vector-input-group label {
  font-weight: 600;
  font-size: 0.875rem;
}

/* ---------- Formula ---------- */
.edu-wrapper .formula {
  background: var(--edu-code-bg);
  color: var(--edu-code-text);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  text-align: center;
  margin: 1rem 0;
  font-family: 'Fira Code', monospace;
  font-size: 1rem;
}
.edu-wrapper .formula p { margin: 0; color: var(--edu-code-text); }

.edu-wrapper .formula-display {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.625rem;
  margin: 1.25rem 0;
  font-size: 1.375rem;
  font-weight: 700;
}
.edu-wrapper #formula-a, .edu-wrapper #formula-c { color: var(--edu-primary); }
.edu-wrapper #formula-b, .edu-wrapper #formula-d { color: #DC2626; }
.dark .edu-wrapper #formula-b, .dark .edu-wrapper #formula-d { color: #FB923C; }

/* ---------- Hint / Info Box ---------- */
.edu-wrapper .hint,
.edu-wrapper .info-box {
  background: var(--edu-hint-bg);
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--edu-hint-border);
  margin: 1rem 0;
  border-radius: 0 0.5rem 0.5rem 0;
  color: var(--edu-text);
}
.edu-wrapper .hint p,
.edu-wrapper .info-box p { margin: 0; }

/* ---------- Code ---------- */
.edu-wrapper .code-example {
  background: var(--edu-code-bg);
  border-radius: 0.5rem;
  padding: 1rem;
  overflow-x: auto;
}
.edu-wrapper .code-example code {
  color: var(--edu-code-text);
  font-family: 'Fira Code', 'Consolas', monospace;
  white-space: pre;
  font-size: 0.875rem;
  display: block;
  line-height: 1.6;
}

.edu-wrapper pre {
  background: var(--edu-code-bg);
  color: var(--edu-code-text);
  padding: 1rem;
  border-radius: 0.5rem;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: 0.875rem;
  overflow-x: auto;
}

/* ---------- Cluster & Pairs ---------- */
.edu-wrapper .cluster-list { list-style: none; padding: 0; }
.edu-wrapper .cluster-item {
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--edu-bg);
  border-radius: 0.5rem;
  border-left: 3px solid var(--edu-primary);
}
.edu-wrapper .cluster-name { font-weight: 700; color: var(--edu-text); margin-bottom: 0.25rem; }
.edu-wrapper .cluster-words { font-size: 0.875rem; color: var(--edu-text-secondary); }

.edu-wrapper .pairs-list { list-style: none; padding: 0; }
.edu-wrapper .pair-item {
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--edu-bg);
  border-radius: 0.5rem;
  border-left: 3px solid var(--edu-primary);
}
.edu-wrapper .pair-words { font-weight: 700; color: var(--edu-text); margin-bottom: 0.25rem; }
.edu-wrapper .pair-metrics {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--edu-text-secondary);
}

/* ---------- Distance Matrix ---------- */
.edu-wrapper table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.edu-wrapper th, .edu-wrapper td {
  padding: 0.5rem;
  border: 1px solid var(--edu-border);
  text-align: center;
}
.edu-wrapper th {
  background: var(--edu-bg-input);
  font-weight: 600;
  color: var(--edu-text);
}

/* ---------- Quiz ---------- */
.edu-wrapper #quiz-container {
  max-width: 700px;
  margin: 0 auto;
  background: var(--edu-bg);
  border-radius: var(--edu-radius);
  box-shadow: var(--edu-shadow-md);
  padding: 1.5rem;
  border: 1px solid var(--edu-border);
}

.edu-wrapper .quiz-header {
  text-align: center;
  margin-bottom: 1.25rem;
}
.edu-wrapper .quiz-header h2 {
  color: var(--edu-primary);
  margin-bottom: 0.5rem;
}

.edu-wrapper .progress-bar {
  width: 100%;
  height: 6px;
  background: var(--edu-bg-input);
  border-radius: 3px;
  overflow: hidden;
}
.edu-wrapper .progress-fill {
  height: 100%;
  background: linear-gradient(to right, var(--edu-primary), var(--edu-accent));
  width: 0;
  transition: width 0.3s ease;
}
.edu-wrapper .progress-text {
  font-size: 0.8125rem;
  text-align: right;
  margin-top: 0.25rem;
  color: var(--edu-text-secondary);
}

.edu-wrapper .quiz-question {
  background: var(--edu-bg-alt);
  border-radius: var(--edu-radius);
  padding: 1rem;
  margin-bottom: 1.25rem;
  border: 1px solid var(--edu-border);
}

.edu-wrapper .question-text {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: var(--edu-text);
}
.edu-wrapper .question-text h4 {
  color: var(--edu-primary);
  margin-bottom: 0.5rem;
}

.edu-wrapper .options-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.edu-wrapper .option {
  display: flex;
  align-items: flex-start;
  padding: 0.625rem;
  border: 1px solid var(--edu-border);
  border-radius: 0.375rem;
  transition: background 0.2s;
  cursor: pointer;
}
.edu-wrapper .option:hover {
  background: var(--edu-bg-input);
}

.edu-wrapper .option input[type="radio"] {
  margin-top: 2px;
  margin-right: 0.625rem;
}
.edu-wrapper .option label {
  flex: 1;
  cursor: pointer;
  font-size: 0.9375rem;
}
.edu-wrapper .option label.correct { color: var(--edu-success); font-weight: 500; }
.edu-wrapper .option label.wrong { color: var(--edu-error); text-decoration: line-through; }

.edu-wrapper .explanation {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--edu-hint-bg);
  border-left: 4px solid var(--edu-primary);
  border-radius: 0 0.375rem 0.375rem 0;
}
.edu-wrapper .explanation h4 {
  margin: 0 0 0.25rem;
  color: var(--edu-primary);
}

.edu-wrapper .quiz-controls {
  display: flex;
  justify-content: space-between;
  margin-top: 1.5rem;
}

.edu-wrapper .quiz-btn {
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: 0.375rem;
  cursor: pointer;
  font-weight: 500;
}
.edu-wrapper .quiz-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.edu-wrapper #prev-question, .edu-wrapper #next-question {
  background: var(--edu-bg-input);
  color: var(--edu-text);
}
.edu-wrapper #submit-quiz {
  background: var(--edu-primary);
  color: #fff;
}
.dark .edu-wrapper #submit-quiz { color: #0F172A; }

.edu-wrapper .score-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 1.25rem 0;
}
.edu-wrapper .score-circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, #1B3A5C, #60A5FA);
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.edu-wrapper .correct-answer {
  background: var(--edu-success-bg);
  color: var(--edu-success);
  padding: 0.5rem;
  border-radius: 0.375rem;
}
.edu-wrapper .wrong-answer {
  background: var(--edu-error-bg);
  color: var(--edu-error);
  padding: 0.5rem;
  border-radius: 0.375rem;
}

.edu-wrapper .recommendation-box {
  background: var(--edu-hint-bg);
  border-radius: var(--edu-radius);
  padding: 1rem;
  margin: 1rem 0;
}
.edu-wrapper .recommendation-box h4 { color: var(--edu-primary); margin-bottom: 0.5rem; }

.edu-wrapper #restart-quiz,
.edu-wrapper #reset-quiz {
  background: var(--edu-text-secondary);
  color: #fff;
  margin-top: 1rem;
}

/* ---------- Analogy ---------- */
.edu-wrapper .analogy-controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.edu-wrapper .preset-selection {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}
.edu-wrapper .custom-analogy {
  border: 1px solid var(--edu-border);
  padding: 1rem;
  border-radius: var(--edu-radius);
  background: var(--edu-bg-alt);
}
.edu-wrapper .analogy-inputs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0.625rem 0;
}
.edu-wrapper .analogy-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 100px;
}
.edu-wrapper .analogy-result span {
  padding: 0.5rem;
  background: var(--edu-hint-bg);
  border-radius: 0.375rem;
  display: inline-block;
  text-align: center;
  font-weight: 700;
  color: var(--edu-primary);
}
.edu-wrapper .analogy-explanation {
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--edu-hint-bg);
  border-left: 4px solid var(--edu-primary);
  border-radius: 0 0.375rem 0.375rem 0;
}
.edu-wrapper .analogy-explanation p {
  margin: 0.25rem 0;
  font-size: 0.875rem;
  color: var(--edu-text-secondary);
}

/* ---------- Application Cards ---------- */
.edu-wrapper .applications-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}
.edu-wrapper .applications-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.edu-wrapper .app-card {
  background: var(--edu-bg);
  border-radius: var(--edu-radius);
  box-shadow: var(--edu-shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--edu-border);
}
.edu-wrapper .app-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--edu-shadow-md);
}

.edu-wrapper .app-card-header {
  padding: 0.875rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.edu-wrapper .app-card-header h4 { margin: 0; font-size: 1.0625rem; color: #fff; }
.edu-wrapper .app-icon { font-size: 1.375rem; }

.edu-wrapper .app-card-content { padding: 1rem; }
.edu-wrapper .app-card-content p { margin-bottom: 0.5rem; }
.edu-wrapper .app-card-content ul { padding-left: 1.25rem; }
.edu-wrapper .app-card-content li { margin-bottom: 0.375rem; }

.edu-wrapper .app-demo {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--edu-bg-alt);
  border-radius: 0.375rem;
}

/* App card header gradients */
.edu-wrapper .nlp-card .app-card-header { background: linear-gradient(135deg, #1B3A5C, #3B6BA5); }
.edu-wrapper .recommender-card .app-card-header { background: linear-gradient(135deg, #059669, #34D399); }
.edu-wrapper .vision-card .app-card-header { background: linear-gradient(135deg, #7C3AED, #A78BFA); }
.edu-wrapper .medical-card .app-card-header { background: linear-gradient(135deg, #D97706, #FBBF24); }
.edu-wrapper .rag-card .app-card-header { background: linear-gradient(135deg, #475569, #94A3B8); }
.edu-wrapper .finance-card .app-card-header { background: linear-gradient(135deg, #15803D, #4ADE80); }

/* ---------- RAG Components ---------- */
.edu-wrapper .architecture-diagram {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  margin: 1rem 0;
  padding: 1rem;
  background: var(--edu-bg-alt);
  border-radius: var(--edu-radius);
}
.edu-wrapper .component {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
  padding: 0.75rem;
  border-radius: var(--edu-radius);
  min-width: 100px;
  text-align: center;
}
.edu-wrapper .component-title { font-weight: 700; color: var(--edu-primary); margin-bottom: 0.25rem; font-size: 0.875rem; }
.edu-wrapper .component-desc { font-size: 0.8125rem; color: var(--edu-text-secondary); }
.edu-wrapper .arrow { font-size: 1.25rem; color: var(--edu-text-secondary); }

.edu-wrapper .vector-db-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.edu-wrapper .vector-db-card {
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
  border-radius: var(--edu-radius);
  padding: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.edu-wrapper .vector-db-card:hover {
  border-color: var(--edu-primary);
  box-shadow: var(--edu-shadow-md);
}
.edu-wrapper .vector-db-card h4 {
  color: var(--edu-primary);
  margin: 0 0 0.5rem;
  padding-bottom: 0.375rem;
  border-bottom: 1px solid var(--edu-border);
  font-size: 1rem;
}

/* ---------- Table Styles ---------- */
.edu-wrapper .comparison-table,
.edu-wrapper .similarity-table,
.edu-wrapper .distance-comparison-table {
  width: 100%;
  font-size: 0.875rem;
}
.edu-wrapper .table-header {
  display: flex;
  background: var(--edu-code-bg);
  color: var(--edu-code-text);
  font-weight: 700;
}
.edu-wrapper .table-row {
  display: flex;
  border-bottom: 1px solid var(--edu-border);
}
.edu-wrapper .table-row:nth-child(even) { background: var(--edu-bg-alt); }
.edu-wrapper .table-cell { flex: 1; padding: 0.5rem 0.75rem; text-align: center; }
.edu-wrapper .table-cell:first-child { flex: 2; text-align: left; }
.edu-wrapper .good { color: #16A34A; font-weight: 700; }
.edu-wrapper .medium { color: #D97706; }
.edu-wrapper .bad { color: #DC2626; }

/* ---------- Fullscreen ---------- */
.edu-wrapper .fullscreen-toggle {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  z-index: 50;
  background: rgba(0,0,0,0.6);
  color: #fff;
  border: none;
  border-radius: 0.375rem;
  padding: 0.375rem;
  font-size: 0.875rem;
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
.edu-wrapper .fullscreen-toggle:hover {
  background: rgba(0,0,0,0.85);
  transform: none;
  opacity: 1;
}

.fullscreen {
  position: fixed !important;
  inset: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 9999 !important;
  background: var(--edu-bg, #fff) !important;
  margin: 0 !important;
  padding: 1.25rem !important;
  display: flex !important;
  justify-content: center !important;
  align-items: center !important;
  border-radius: 0 !important;
}
.fullscreen .fullscreen-toggle {
  position: fixed !important;
  top: 1rem !important;
  right: 1rem !important;
  z-index: 10000 !important;
}

/* ---------- Controls ---------- */
.edu-wrapper .controls,
.edu-wrapper .controls-cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
}
.edu-wrapper .slider-container {
  display: flex;
  flex-direction: column;
  min-width: 200px;
}
.edu-wrapper .select-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.edu-wrapper input[type="range"] {
  width: 100%;
  margin: 0.25rem 0;
}

/* ---------- Related Words ---------- */
.edu-wrapper .related-words-inline {
  margin-top: 0.625rem;
  padding: 0.625rem;
  background: var(--edu-bg-alt);
  border-radius: 0.375rem;
  border-left: 3px solid var(--edu-primary);
}
.edu-wrapper .related-words-heading { font-weight: 600; color: var(--edu-text); margin-bottom: 0.25rem; }
.edu-wrapper .related-words-inline ul { list-style: none; padding-left: 0.625rem; margin: 0.25rem 0; }
.edu-wrapper .related-words-inline li { display: flex; align-items: center; margin-bottom: 0.125rem; font-size: 0.875rem; }
.edu-wrapper .related-word { font-weight: 500; margin-right: 0.375rem; }

.edu-wrapper .word-embedding {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--edu-border);
}
.edu-wrapper .word-label {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--edu-text);
  margin-bottom: 0.5rem;
}

/* ---------- Placeholder ---------- */
.edu-wrapper .edu-placeholder {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--edu-text-secondary);
  border: 2px dashed var(--edu-border);
  border-radius: var(--edu-radius-lg);
  font-size: 1.125rem;
}

/* ---------- Error ---------- */
.edu-wrapper .error-message {
  padding: 0.75rem;
  background: var(--edu-error-bg);
  border-left: 4px solid var(--edu-error);
  color: var(--edu-error);
  margin: 1rem 0;
  border-radius: 0 0.375rem 0.375rem 0;
}

/* ---------- Future Trends ---------- */
.edu-wrapper .future-trends {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.edu-wrapper .trend-item {
  background: var(--edu-bg);
  padding: 1rem;
  border-radius: var(--edu-radius);
  box-shadow: var(--edu-shadow);
  border: 1px solid var(--edu-border);
}
.edu-wrapper .trend-item h4 { color: var(--edu-primary); margin-bottom: 0.5rem; }
.edu-wrapper .trend-item p { margin: 0; color: var(--edu-text-secondary); }

/* ---------- Tokenization (scoped) ---------- */
.edu-wrapper .container {
  max-width: 100%;
  background: var(--edu-bg);
  padding: 1rem;
  border-radius: var(--edu-radius);
  box-shadow: var(--edu-shadow);
  border: 1px solid var(--edu-border);
}

.edu-wrapper .bpe-controls { margin-bottom: 1rem; }
.edu-wrapper .bpe-container {
  display: flex;
  justify-content: space-around;
  align-items: flex-start;
  text-align: left;
  gap: 1rem;
}
.edu-wrapper .bpe-output, .edu-wrapper .bpe-vocab { width: 48%; }
.edu-wrapper .corpus-text {
  background: var(--edu-bg);
  padding: 0.625rem;
  border: 1px solid var(--edu-border);
  border-radius: 0.375rem;
  font-size: 1.125rem;
  min-height: 40px;
}
.edu-wrapper .bpe-token {
  display: inline-block;
  padding: 0.25rem 0.125rem;
  margin: 0.125rem;
  border-radius: 0.1875rem;
  background: var(--edu-hint-bg);
  border: 1px solid var(--edu-border);
  transition: all 0.3s ease;
}
.edu-wrapper .bpe-token.highlight {
  background: #FEF3C7;
  border-color: #F59E0B;
  transform: scale(1.1);
}
.dark .edu-wrapper .bpe-token.highlight {
  background: #422006;
  border-color: #D97706;
}
.edu-wrapper .merge-info {
  margin-top: 0.75rem;
  font-weight: 700;
  font-size: 1rem;
  min-height: 20px;
}

.edu-wrapper .interactive-tokenizer { text-align: center; }
.edu-wrapper #tokenization-output-container {
  min-height: 50px;
  padding: 0.625rem;
  border-radius: 0.375rem;
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
}
.edu-wrapper #tokenization-output .token {
  display: inline-block;
  padding: 0.5rem 0.75rem;
  margin: 0.25rem;
  border-radius: 0.25rem;
  font-weight: 500;
  color: #fff;
  border: 1px solid rgba(0,0,0,0.2);
}

.edu-wrapper #embedding-visualization {
  display: flex;
  justify-content: space-around;
  align-items: flex-start;
  gap: 1rem;
}
.edu-wrapper #token-to-id-map { width: 48%; text-align: center; }
.edu-wrapper #embedding-lookup { width: 48%; }
.edu-wrapper .token-id-pair {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0.5rem 0;
  padding: 0.5rem;
  background: var(--edu-bg-alt);
  border: 1px solid var(--edu-border);
  border-radius: 0.375rem;
}

.edu-wrapper #bpe-reset-button {
  background: var(--edu-text-secondary);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .edu-tabs-nav {
    gap: 0;
  }
  .edu-wrapper .tab-link {
    padding: 0.75rem 0.75rem;
    font-size: 0.85rem;
  }
  .edu-wrapper .subtabs,
  .edu-wrapper .subtabs-pills {
    gap: 0.375rem;
  }
  .edu-wrapper .subtab-link {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
  }
  .edu-wrapper .tutorial-nav {
    gap: 0.125rem;
  }
  .edu-wrapper .tutorial-nav-btn {
    font-size: 0.8125rem;
    padding: 0.375rem 0.5rem;
  }
  .edu-wrapper .course-topics,
  .edu-wrapper .course-grid {
    grid-template-columns: 1fr;
  }
  .edu-wrapper .vector-inputs {
    flex-direction: column;
  }
  .edu-wrapper .analogy-inputs {
    flex-direction: column;
  }
  .edu-wrapper .plot-row {
    flex-direction: column;
  }
  .edu-wrapper .bpe-container {
    flex-direction: column;
  }
  .edu-wrapper .bpe-output, .edu-wrapper .bpe-vocab { width: 100%; }
  .edu-wrapper #embedding-visualization {
    flex-direction: column;
  }
  .edu-wrapper #token-to-id-map,
  .edu-wrapper #embedding-lookup { width: 100%; }
}

/* ---------- Plotly dark mode overrides ---------- */
.dark .edu-wrapper .js-plotly-plot .plotly .modebar-btn path {
  fill: var(--edu-text-secondary) !important;
}