/* GENERATED by scripts/migrate_content.mjs: the lesson-block rules of the original Masterclass stylesheets
   (styles/main.css + lesson.html), on the MAT+ kit tokens via site/lesson-vars.css. */
@keyframes pageEnter {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes pageFadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}
@keyframes logoGlow {
  0%, 100% { filter: drop-shadow(0 0 8px rgba(212, 168, 67, 0.3)); }
  50% { filter: drop-shadow(0 0 18px rgba(212, 168, 67, 0.6)); }
}
@keyframes dropdownFadeIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.quiz-container {
  max-width: 700px;
}
.quiz-question {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}
.quiz-question-text {
  font-size: 1.0625rem;
  font-weight: 500;
  margin-bottom: 1rem;
  color: var(--text-primary);
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.quiz-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.9375rem;
}
.quiz-option:hover {
  border-color: var(--border-light);
  background: var(--bg-tertiary);
}
.quiz-option.selected {
  border-color: var(--gold);
  background: var(--gold-glow);
}
.quiz-option.correct {
  border-color: var(--success);
  background: var(--success-bg);
}
.quiz-option.incorrect {
  border-color: var(--danger);
  background: var(--danger-bg);
}
.quiz-option-radio {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-light);
  border-radius: 50%;
  flex-shrink: 0;
  position: relative;
}
.quiz-option.selected .quiz-option-radio {
  border-color: var(--gold);
}
.quiz-option.selected .quiz-option-radio::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 8px;
  height: 8px;
  background: var(--gold);
  border-radius: 50%;
}
.quiz-feedback {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  margin-top: 0.75rem;
  font-size: 0.875rem;
}
@media (max-width: 1024px) {
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
  }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes pageFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes progressShine {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(200%); }
}
@keyframes progressFillIn {
  from { width: 0 !important; }
}
@keyframes loadingDot {
  0%, 80%, 100% { transform: scale(0.4); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}
@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}
@keyframes toastSlideOut {
  from {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateX(100%) scale(0.9);
  }
}
@keyframes toastProgress {
  from { width: 100%; }
  to { width: 0%; }
}
@keyframes confettiFall {
  0% {
    transform: translateY(-100vh) rotate(0deg);
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}
@keyframes confettiSway {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(30px); }
  75% { transform: translateX(-30px); }
}
@keyframes strikethroughSlash {
  to { transform: scaleX(1); }
}
@keyframes pricePopIn {
  from {
    opacity: 0;
    transform: scale(0.5);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes bellPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.3); }
}
@keyframes notifSlideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes bounceIn {
  0% { opacity: 0; transform: scale(0.3); }
  50% { opacity: 1; transform: scale(1.05); }
  70% { transform: scale(0.9); }
  100% { transform: scale(1); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
@media print {
.lesson-content blockquote,
  .lesson-content table,
  .lesson-content pre,
  .quiz-question,
  .stat-card,
  .results-card {
    page-break-inside: avoid;
  }
}
@keyframes globalShimmer {
  0% { background-position: 200% center; }
  50% { background-position: -200% center; }
  100% { background-position: 200% center; }
}
@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}
@keyframes staggerFadeIn {
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.5); opacity: 0; }
}
@keyframes pageIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes cmdPaletteIn { to { transform: scale(1) translateY(0); opacity: 1; } }
@media (max-width: 1024px) {
.btn,
  .btn-sm,
  .nav-toggle,
  .theme-toggle,
  .nav-bell,
  .toast-close,
  .modal-close,
  .shortcuts-close,
  .reaction-btn,
  .daily-tip-share,
  .font-size-toggle button,
  .global-scroll-top,
  .pd-link,
  .pd-logout,
  .nav-logout-link,
  .premium-tab,
  .period-pill,
  .sidebar-nav-item,
  .quiz-option {
    min-height: 44px;
    min-width: 44px;
  }
}
.card,
.stat-card,
.section-card,
.quiz-question,
.daily-tip,
.continue-card,
.upcoming-item,
.leaderboard,
.empty-state {
  contain: content;
}
.pchart, .echart {
  --pc-bg: #0e1118;
  --pc-grid: rgba(255, 255, 255, 0.055);
  --pc-axis: #8b92a5;
  --pc-text: #eceef3;
  --pc-up: #26a69a;
  --pc-down: #ef5350;
  --pc-gold: #e0b44f;
  margin: 1.75rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--pc-bg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
:root[data-theme="light"] .pchart, :root[data-theme="light"] .echart {
  --pc-bg: #fcfcfd;
  --pc-grid: rgba(20, 24, 40, 0.07);
  --pc-axis: #5a6172;
  --pc-text: #171a26;
  --pc-up: #07806b;
  --pc-down: #cc3a33;
  --pc-gold: #7d6119;
}
.pchart-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.25rem 0.75rem; padding: 0.95rem 1.1rem 0.15rem; margin: 0; }
.pchart-kicker { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--pc-gold); }
.pchart-title { font-size: 0.975rem; font-weight: 700; line-height: 1.35; color: var(--pc-text); letter-spacing: -0.005em; }
.pchart-plot { padding: 0; }
.pchart-plot svg { display: block; max-width: 100%; height: auto; }
.pchart-notes { list-style: none; margin: 0; padding: 0.2rem 1.1rem 1rem; border-top: 1px solid var(--pc-grid); }
.pchart-notes li { position: relative; padding: 0.35rem 0 0 1rem; font-size: 0.875rem; line-height: 1.55; color: var(--text-secondary); }
.pchart-notes li::before { content: ""; position: absolute; left: 0; top: 0.9rem; width: 0.4rem; height: 1px; background: var(--pc-gold); }
.pchart-notes strong { color: var(--pc-text); }
.pc-svg text { font-family: var(--font-sans); font-size: 11px; font-weight: 650; }
.pc-svg .pc-ax { font-family: var(--font-mono); font-size: 10.5px; font-weight: 500; fill: var(--pc-axis); }
.pc-grid { stroke: var(--pc-grid); stroke-width: 1; }
.pc-up line, .pc-dn line { stroke-width: 1.2; }
.pc-up rect { fill: var(--pc-up); }
.pc-up line { stroke: var(--pc-up); }
.pc-dn rect { fill: var(--pc-down); }
.pc-dn line { stroke: var(--pc-down); }
.pc-zone { stroke-width: 1; fill-opacity: 0.13; stroke-opacity: 0.55; }
.pc-zone.pc-win { fill-opacity: 0.11; stroke-opacity: 0; }
.pc-zone.pc-gap { stroke-dasharray: 3 3; }
.pc-zone.pc-t-up { fill: var(--pc-up); stroke: var(--pc-up); }
.pc-zone.pc-t-dn { fill: var(--pc-down); stroke: var(--pc-down); }
.pc-zone.pc-t-gold { fill: var(--pc-gold); stroke: var(--pc-gold); }
.pc-level, .pc-edge { stroke-width: 1.2; stroke-dasharray: 6 4; }
.pc-edge { stroke-dasharray: 2 3; }
.pc-level.pc-t-up, .pc-edge.pc-t-up { stroke: var(--pc-up); }
.pc-level.pc-t-dn, .pc-edge.pc-t-dn { stroke: var(--pc-down); }
.pc-level.pc-t-gold, .pc-edge.pc-t-gold { stroke: var(--pc-gold); }
.pc-break { stroke: var(--pc-gold); stroke-width: 1.4; stroke-dasharray: 5 3; }
.pc-entry { stroke: var(--pc-text); stroke-width: 1.2; stroke-opacity: 0.7; }
.pc-pill { fill: var(--pc-bg); stroke: var(--pc-axis); stroke-opacity: 0.35; }
.pc-tag text { fill: var(--pc-text); }
.pc-t-up .pc-pill { stroke: var(--pc-up); stroke-opacity: 0.8; }
.pc-t-up text { fill: var(--pc-up); }
.pc-t-dn .pc-pill { stroke: var(--pc-down); stroke-opacity: 0.8; }
.pc-t-dn text { fill: var(--pc-down); }
.pc-t-gold .pc-pill { stroke: var(--pc-gold); stroke-opacity: 0.85; }
.pc-t-gold text { fill: var(--pc-gold); }
.pc-strong .pc-pill { fill: var(--pc-gold); stroke: none; }
.pc-strong text { fill: var(--pc-bg); font-weight: 800; letter-spacing: 0.04em; }
.pc-t-entry .pc-pill { stroke: var(--pc-text); stroke-opacity: 0.5; }
.pc-t-note text { font-weight: 550; fill: var(--pc-axis); }
.pc-svg .pc-market { font-size: 11px; font-weight: 700; letter-spacing: 0.06em; fill: var(--pc-axis); }
.pc-trail { fill: none; stroke: var(--pc-gold); stroke-width: 1.8; stroke-linejoin: round; }
.pc-trail-fixed { stroke: var(--pc-axis); stroke-width: 1.4; stroke-dasharray: 4 3; }
.pc-mark { fill: none; stroke-width: 2.2; stroke-linecap: round; }
.pc-order { stroke: var(--pc-gold); stroke-width: 1.6; stroke-dasharray: 6 3; }
.pc-order-open { stroke: var(--pc-axis); stroke-opacity: 0.8; }
.pc-fill { fill: var(--pc-gold); stroke: var(--pc-bg); stroke-width: 1.5; }
.pc-stopout { stroke: var(--pc-down); stroke-width: 1.8; stroke-dasharray: 5 3; }
.pc-mark.pc-t-up { stroke: var(--pc-up); fill: var(--pc-bg); }
.pc-mark.pc-t-dn { stroke: var(--pc-down); }
.pc-mark.pc-t-gold { stroke: var(--pc-gold); }
.pc-mark.pc-t-mute { stroke: var(--pc-axis); }
.pc-t-mute .pc-pill { stroke: var(--pc-axis); stroke-opacity: 0.8; }
.pc-t-mute text { fill: var(--pc-axis); }
.pc-t-up.pc-strong .pc-pill { fill: var(--pc-up); }
.pc-t-dn.pc-strong .pc-pill { fill: var(--pc-down); }
.pc-t-up.pc-strong text, .pc-t-dn.pc-strong text { fill: var(--pc-bg); }
.pc-div { stroke: var(--pc-gold); stroke-width: 2; stroke-linecap: round; }
.pc-div-dot { fill: var(--pc-gold); }
.pc-rsi { fill: none; stroke: var(--pc-text); stroke-opacity: 0.75; stroke-width: 1.3; stroke-linejoin: round; }
.pc-rsi-guide { stroke: var(--pc-axis); stroke-opacity: 0.45; stroke-width: 1; stroke-dasharray: 3 4; }
.pc-pane-sep { stroke: var(--pc-axis); stroke-opacity: 0.3; stroke-width: 1; }
.pc-svg .pc-pane-name { font-weight: 700; letter-spacing: 0.06em; }
.pc-svg .pc-illus { font-size: 10px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; fill: var(--pc-axis); opacity: 0.75; }
.eq-line { fill: none; stroke-width: 1.6; stroke-linejoin: round; stroke-linecap: round; opacity: 0.8; }
.eq-line.eq-main { stroke-width: 2.2; opacity: 1; }
.eq-line.eq-t-gold { stroke: var(--pc-gold); }
.eq-line.eq-t-up { stroke: var(--pc-up); }
.eq-line.eq-t-down { stroke: var(--pc-down); }
.eq-line.eq-t-mute { stroke: var(--pc-axis); }
.pc-grid.eq-base { stroke: var(--pc-axis); stroke-opacity: 0.45; }
.eq-floor { fill: none; stroke: var(--pc-down); stroke-width: 1.4; stroke-dasharray: 7 4; opacity: 0.85; }
.eq-floor.eq-floor-trail { stroke-dasharray: 3 3; stroke-width: 1.6; }
.eq-target { stroke: var(--pc-gold); stroke-width: 1.3; stroke-dasharray: 7 4; }
.eq-ddzone { fill: var(--pc-down); fill-opacity: 0.1; }
.eq-hwm { stroke: var(--pc-axis); stroke-width: 1; stroke-dasharray: 3 3; }
.eq-ddbar { stroke: var(--pc-down); stroke-width: 2; }
.eq-breach { fill: var(--pc-down); stroke: var(--pc-bg); stroke-width: 1.5; }
.eq-hit { fill: var(--pc-gold); stroke: var(--pc-bg); stroke-width: 1.5; }
.eq-over { fill: var(--pc-up); stroke: var(--pc-bg); stroke-width: 1.5; }
.eq-ma { fill: none; stroke: var(--pc-text); stroke-opacity: 0.55; stroke-width: 1.4; stroke-dasharray: 5 3; stroke-linejoin: round; }
.eq-below, .eq-lossper { fill: var(--pc-down); fill-opacity: 0.09; }
.eq-period { stroke: var(--pc-axis); stroke-opacity: 0.22; stroke-width: 1; }
.pc-svg .eq-axname { font-family: var(--font-sans); font-weight: 700; letter-spacing: 0.06em; }
.eq-stats { list-style: none; margin: 0; padding: 0.35rem 1.1rem 0.6rem; border-top: 1px solid var(--pc-grid); }
.eq-stats li { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.15rem 0.9rem; padding: 0.45rem 0; font-size: 0.8125rem; line-height: 1.45; color: var(--text-secondary); }
.eq-stats li + li { border-top: 1px solid var(--pc-grid); }
.eq-name { display: inline-flex; align-items: center; gap: 0.4rem; flex-basis: 100%; font-weight: 700; color: var(--pc-text); font-size: 0.875rem; }
.eq-sw { display: inline-block; width: 0.9rem; height: 3px; border-radius: 2px; background: var(--pc-gold); }
.eq-sw.eq-t-up { background: var(--pc-up); }
.eq-sw.eq-t-down { background: var(--pc-down); }
.eq-sw.eq-t-mute { background: var(--pc-axis); }
.eq-stat { white-space: nowrap; }
.eq-stat b { font-family: var(--font-mono); font-weight: 600; color: var(--pc-text); }
@media (max-width: 600px) {
.pchart, .echart { margin: 1.25rem 0; border-radius: var(--radius-md); }
.eq-stats { padding: 0.3rem 0.85rem 0.5rem; }
.pchart-head { padding: 0.8rem 0.85rem 0.1rem; }
.pchart-notes { padding: 0.15rem 0.85rem 0.85rem; }
}
@keyframes orbFloat1 { 0%,100%{transform:translate(0,0)} 50%{transform:translate(-30px,40px)} }
@keyframes orbFloat2 { 0%,100%{transform:translate(0,0)} 50%{transform:translate(20px,-30px)} }
@keyframes progressShimmer {
      0%, 100% { background-position: 0% 0; }
      50% { background-position: 100% 0; }
    }
@keyframes titleShimmer {
      0%, 100% { background-position: 0% center; }
      50% { background-position: 200% center; }
    }
.lesson-content .table-container {
      overflow-x: auto; margin: 2rem 0; border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.3s ease;
    }
.lesson-content .table-container:hover {
      box-shadow: var(--shadow-md), 0 0 20px rgba(212,168,67,0.05);
    }
.fillable-table { position: relative; }
.fillable-table::before {
      content: '✏️ Fill in your answers — saved automatically';
      display: block; font-size: 0.75rem; color: var(--gold); font-weight: 600;
      margin-bottom: 0.5rem; letter-spacing: 0.03em; opacity: 0.8;
    }
.ft-cell { white-space: nowrap; }
.ft-input {
      background: rgba(212, 168, 67, 0.08);
      border: 1px solid rgba(212, 168, 67, 0.25);
      border-radius: var(--radius-sm);
      color: var(--gold-light);
      padding: 0.375rem 0.5rem;
      font-size: 0.875rem;
      font-weight: 600;
      font-family: inherit;
      transition: all var(--transition-fast);
      outline: none;
    }
.ft-input:focus {
      border-color: var(--gold);
      background: rgba(212, 168, 67, 0.12);
      box-shadow: 0 0 0 2px rgba(212, 168, 67, 0.15);
    }
.ft-score-input { width: 50px; text-align: center; }
.ft-pct-input { width: 60px; text-align: center; }
.ft-text-input { width: 140px; }
.ft-input[type="number"] { width: 70px; text-align: center; }
.ft-input[type="number"]::-webkit-inner-spin-button { opacity: 0.5; }
.ft-prefix, .ft-suffix, .ft-denominator {
      color: var(--text-muted); font-size: 0.8125rem; font-weight: 600;
    }
.ft-prefix { margin-right: 0.125rem; }
.ft-suffix { margin-left: 0.25rem; }
.ft-denominator { margin-left: 0.125rem; color: var(--text-muted); }
.ft-total-row { font-weight: 700; }
.ft-total-row td { border-top: 2px solid var(--gold) !important; }
.ft-total-value {
      color: var(--gold); font-weight: 800; font-size: 1rem;
    }
.quiz-section {
      background: var(--bg-card); border: 1px solid var(--border-color);
      border-radius: var(--radius-lg); padding: 2rem; margin: 2rem 0;
      position: relative; overflow: hidden;
    }
.quiz-section::before {
      content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, var(--info), var(--gold), var(--success));
    }
.quiz-section h2 { border: none !important; margin-top: 0 !important; }
.quiz-section h2::before { display: none !important; }
.quiz-question {
      background: var(--bg-tertiary); border-radius: var(--radius-md);
      padding: 1.25rem; margin: 1rem 0; cursor: default;
      border: 1px solid var(--border-color); transition: all var(--transition-base);
    }
.quiz-question .q-label {
      font-weight: 700; color: var(--gold); font-size: 0.8125rem;
      text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.5rem;
    }
.quiz-question .q-text { color: var(--text-primary); margin-bottom: 0.75rem; font-weight: 500; }
.quiz-answer {
      display: none; padding-top: 0.75rem; border-top: 1px solid var(--border-color);
      color: var(--success); font-weight: 500;
    }
.quiz-question.revealed .quiz-answer { display: block; }
.quiz-question .reveal-btn {
      display: inline-block; background: var(--info-bg); color: var(--info);
      border: 1px solid rgba(52,152,219,0.3); border-radius: var(--radius-sm);
      padding: 0.375rem 1rem; font-size: 0.8125rem; font-weight: 600;
      cursor: pointer; transition: all var(--transition-fast);
    }
.quiz-question .reveal-btn:hover { background: rgba(52,152,219,0.2); }
.quiz-question.revealed .reveal-btn { display: none; }
.quiz-score {
      text-align: center; padding: 1rem; margin-top: 1rem;
      background: var(--bg-tertiary); border-radius: var(--radius-md);
    }
.quiz-score .score-num {
      font-size: 2rem; font-weight: 700; color: var(--gold);
    }
.key-concept {
      background: linear-gradient(135deg, var(--bg-card), rgba(212,168,67,0.03));
      border: 1px solid var(--gold-glow-strong);
      border-left: 4px solid var(--gold); border-radius: var(--radius-lg);
      padding: 1.25rem 1.5rem; margin: 2rem 0;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      position: relative; overflow: hidden;
    }
.key-concept::after {
      content: ''; position: absolute; top: 0; right: 0;
      width: 80px; height: 80px; border-radius: 50%;
      background: radial-gradient(circle, var(--gold-glow), transparent 70%);
      transform: translate(30%, -30%); pointer-events: none;
    }
.key-concept:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 20px var(--gold-glow), 0 0 0 1px var(--gold-glow-strong);
    }
.key-concept .kc-label {
      font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.1em; color: var(--gold); margin-bottom: 0.5rem;
      display: flex; align-items: center; gap: 0.5rem;
    }
.callout-warning {
      background: linear-gradient(135deg, var(--danger-bg), rgba(231,76,60,0.03));
      border: 1px solid rgba(231,76,60,0.2);
      border-left: 4px solid var(--danger); border-radius: var(--radius-lg);
      padding: 1.25rem 1.5rem; margin: 2rem 0;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
.callout-warning:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 20px rgba(231,76,60,0.1);
    }
.callout-warning .cw-label {
      font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.1em; color: var(--danger); margin-bottom: 0.5rem;
    }
.lesson-content .md-checklist {
      list-style: none;
      padding-left: 0;
      margin: 1.5rem 0;
    }
.lesson-content .md-check-item {
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
      padding: 0.75rem 1rem;
      margin-bottom: 0.5rem;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      transition: all var(--transition-fast);
      cursor: pointer;
      line-height: 1.5;
      user-select: none;
    }
.lesson-content .md-check-item:hover {
      border-color: rgba(212, 168, 67, 0.3);
      background: var(--bg-card-hover);
    }
.lesson-content .md-check-item:active {
      transform: scale(0.98);
    }
.lesson-content .md-check-box {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 22px;
      height: 22px;
      min-width: 22px;
      border-radius: 6px;
      border: 2px solid var(--border-light);
      font-size: 0.75rem;
      margin-top: 1px;
      transition: all var(--transition-fast);
    }
.lesson-content .md-check-item.checked .md-check-box {
      background: var(--success);
      border-color: var(--success);
      color: #fff;
    }
.lesson-content .md-check-item.checked {
      border-color: rgba(46, 204, 113, 0.2);
      background: rgba(46, 204, 113, 0.05);
    }
.pchart .reveal-element, .echart .reveal-element { opacity: 1; transform: none; transition: none; }
.scenario-block.reveal-element { transform: translateY(30px) scale(0.98); }
.scenario-block.reveal-element.revealed { transform: translateY(0) scale(1); }
.takeaway-block.reveal-element { transform: translateX(-20px); }
.takeaway-block.reveal-element.revealed { transform: translateX(0); }
.practice-block.reveal-element { transform: translateY(24px); }
.practice-block.reveal-element.revealed { transform: translateX(0); }
.formula-block.reveal-element { transform: translateY(30px) scale(0.98); }
.formula-block.reveal-element.revealed { transform: translateY(0) scale(1); }
.eli5-block.reveal-element { transform: scale(0.95); }
.eli5-block.reveal-element.revealed { transform: scale(1); }
@keyframes fadeSlideIn {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }
.visual-card {
      /* dark only: in light theme a fade to #1a1a2a put the card's last lines on near-black */
      background: linear-gradient(135deg, var(--bg-card) 0%, var(--vc-bg-end, #1a1a2a) 100%);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      margin: 2rem 0;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    }
.visual-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-lg), 0 0 30px rgba(212,168,67,0.08);
      border-color: var(--gold-glow-strong);
    }
.visual-card .vc-header {
      background: linear-gradient(90deg, var(--gold-dark), var(--gold), var(--gold-dark));
      background-size: 200% 100%;
      color: var(--text-inverse);
      font-weight: 700;
      font-size: 0.8125rem;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      padding: 0.75rem 1.5rem;
      animation: vcHeaderShimmer 6s ease infinite;
    }
@keyframes vcHeaderShimmer {
      0%, 100% { background-position: 0% 0; }
      50% { background-position: 100% 0; }
    }
:root[data-theme="light"] .visual-card { --vc-bg-end: var(--bg-tertiary); }
.visual-card .vc-body {
      padding: 1.5rem;
      container-type: inline-size; /* .vc-ascii-chart sizes its font from this width */
    }
@media (max-width: 600px) {
.visual-card .vc-body { padding: 1rem; }
}
.visual-card .vc-subheader {
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--gold-light);
      margin: 1.25rem 0 0.5rem;
      padding-bottom: 0.375rem;
      border-bottom: 1px solid var(--border-color);
    }
.visual-card .vc-subheader:first-child { margin-top: 0; }
.visual-card .vc-text {
      color: var(--text-secondary);
      font-size: 0.9rem;
      line-height: 1.6;
      margin: 0.375rem 0;
    }
.visual-card .vc-callout {
      background: var(--gold-glow);
      border-left: 3px solid var(--gold);
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      padding: 0.75rem 1rem;
      margin: 1rem 0;
      font-weight: 600;
      color: var(--gold-light);
      font-size: 0.875rem;
    }
.visual-card .vc-compare {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
      margin: 0.75rem 0;
    }
.visual-card .vc-col {
      background: var(--bg-tertiary);
      border-radius: var(--radius-md);
      padding: 1rem;
      border: 1px solid var(--border-color);
      overflow: hidden;
      word-break: break-word;
      min-width: 0;
    }
.visual-card .vc-col-left { border-top: 3px solid var(--success); }
.visual-card .vc-col-right { border-top: 3px solid var(--danger); }
.visual-card .vc-col-title {
      font-weight: 700;
      font-size: 0.8125rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 0.75rem;
    }
.visual-card .vc-col-left .vc-col-title { color: var(--success); }
.visual-card .vc-col-right .vc-col-title { color: var(--danger); }
.visual-card .vc-col .vc-item {
      padding: 0.5rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      font-size: 0.875rem;
      color: var(--text-secondary);
      line-height: 1.5;
    }
.visual-card .vc-col .vc-item:last-child { border-bottom: none; }
.visual-card .vc-steps {
      display: flex;
      flex-wrap: wrap;
      align-items: stretch;
      gap: 0.5rem;
      margin: 0.75rem 0;
      justify-content: center;
    }
.visual-card .vc-step {
      flex: 1;
      min-width: 120px;
      background: var(--bg-tertiary);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1rem;
      text-align: center;
    }
.visual-card .vc-step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--gold);
      color: var(--text-inverse);
      font-weight: 700;
      font-size: 0.875rem;
      margin-bottom: 0.5rem;
    }
.visual-card .vc-step-title {
      font-size: 0.8125rem;
      font-weight: 800;
      color: var(--gold);
      text-transform: uppercase;
      letter-spacing: 0.06em;
      margin-bottom: 0.125rem;
    }
.visual-card .vc-step-subtitle {
      font-size: 0.6875rem;
      color: var(--text-muted);
      margin-bottom: 0.375rem;
    }
.visual-card .vc-step-text {
      font-size: 0.8125rem;
      color: var(--text-secondary);
      line-height: 1.5;
    }
.visual-card .vc-step-arrow {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--gold-glow);
      border: 1px solid rgba(212,168,67,0.2);
      color: var(--gold);
      font-size: 1rem;
      font-weight: 700;
      align-self: center;
      flex-shrink: 0;
    }
.visual-card .vc-list {
      margin: 0.5rem 0;
    }
.visual-card .vc-list-item {
      padding: 0.5rem 0.75rem;
      margin: 0.25rem 0;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      color: var(--text-secondary);
      line-height: 1.5;
      background: rgba(255,255,255,0.02);
      border-left: 3px solid var(--border-color);
    }
.visual-card .vc-list-item.vc-positive {
      border-left-color: var(--success);
      background: rgba(46, 204, 113, 0.06);
    }
.visual-card .vc-list-item.vc-negative {
      border-left-color: var(--danger);
      background: rgba(231, 76, 60, 0.06);
    }
.visual-card .vc-box {
      background: var(--bg-tertiary);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1rem 1.25rem;
      margin: 0.75rem 0;
    }
.visual-card .vc-box div {
      color: var(--text-secondary);
      font-size: 0.875rem;
      line-height: 1.6;
    }
.visual-card .vc-ascii-chart {
      background: var(--bg-primary);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1.25rem 1.5rem;
      margin: 0.75rem 0;
      font-family: ui-monospace, 'SF Mono', Menlo, Consolas, 'Courier New', monospace;
      /* the widest line (--cols, set by the renderer) fits the card: no sideways scroll on a phone */
      font-size: min(0.8125rem, calc((100cqi - 1.75rem - 2px) / (var(--cols, 40) * 0.62)));
      line-height: 1.45;
      color: var(--gold-light);
      overflow-x: auto;
      white-space: pre;
      tab-size: 2;
      padding: 0.75rem 0.875rem;
    }
.visual-card .vc-checklist {
      margin: 0.5rem 0;
    }
.visual-card .vc-check-item {
      padding: 0.5rem 0.75rem;
      margin: 0.25rem 0;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      color: var(--text-secondary);
      background: var(--bg-tertiary);
      border: 1px solid var(--border-color);
      cursor: pointer;
      user-select: none;
      transition: all var(--transition-fast);
    }
.visual-card .vc-check-item:hover {
      border-color: rgba(212, 168, 67, 0.3);
    }
.visual-card .vc-check-item:active {
      transform: scale(0.98);
    }
.visual-card .vc-check-item .vc-check-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      border: 2px solid var(--border-light);
      font-size: 0.6875rem;
      margin-right: 0.5rem;
      vertical-align: middle;
    }
.visual-card .vc-check-item.vc-checked {
      border-color: var(--success);
      background: rgba(46, 204, 113, 0.08);
    }
.visual-card .vc-check-item.vc-checked .vc-check-icon {
      background: var(--success);
      border-color: var(--success);
      color: #fff;
    }
@media (max-width: 640px) {
.visual-card .vc-compare { grid-template-columns: 1fr; }
.visual-card .vc-steps { flex-direction: column; align-items: center; }
.visual-card .vc-step { width: 100%; min-width: auto; }
.visual-card .vc-step-arrow { transform: rotate(90deg); }
}
.quiz-interactive {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      margin: 2rem 0;
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      position: relative;
    }
.quiz-interactive::before {
      content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, var(--gold), var(--info), var(--gold));
      opacity: 0; transition: opacity 0.3s ease; z-index: 1;
    }
.quiz-interactive:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 30px rgba(0,0,0,0.3);
      border-color: rgba(212,168,67,0.3);
    }
.quiz-interactive:hover::before { opacity: 1; }
.qi-header {
      background: linear-gradient(90deg, #1a1a2e, #16213e);
      padding: 0.75rem 1.5rem;
      font-size: 0.8125rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--gold);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
.qi-icon { font-size: 1.1rem; }
.qi-question {
      padding: 1.25rem 1.5rem 0.75rem;
      font-size: 1.0625rem;
      font-weight: 600;
      color: var(--text-primary);
      line-height: 1.5;
    }
.qi-feedback {
      margin: 0.75rem 1.5rem 1rem;
      padding: 0.75rem 1rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.9375rem;
    }
.qi-feedback-correct {
      background: var(--success-bg);
      color: var(--success);
      border: 1px solid rgba(46,204,113,0.3);
    }
.qi-feedback-incorrect {
      background: var(--danger-bg);
      color: var(--danger);
      border: 1px solid rgba(231,76,60,0.3);
    }
.qi-explanation {
      margin: 0 1.5rem 1.25rem;
      padding: 0.75rem 1rem;
      background: var(--gold-glow);
      border-left: 3px solid var(--gold);
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      font-size: 0.875rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }
.qi-submit-btn {
      margin: 0.75rem 1.5rem 1.25rem;
      padding: 0.5rem 1.5rem;
      background: var(--gold);
      color: var(--text-inverse);
      border: none;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.875rem;
      cursor: pointer;
      transition: all var(--transition-fast);
    }
.qi-submit-btn:hover { filter: brightness(1.1); }
.qi-score {
      margin: 0.75rem 1.5rem 1.25rem;
      padding: 0.75rem 1rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      text-align: center;
      font-size: 0.9375rem;
    }
.qi-score-pass { background: var(--success-bg); color: var(--success); }
.qi-score-fail { background: var(--danger-bg); color: var(--danger); }
.qi-score-num { font-size: 1.25rem; }
.chart-quiz-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0.75rem;
      padding: 0 1.5rem 1rem;
    }
.chart-quiz-option {
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 0.75rem;
      cursor: pointer;
      transition: all var(--transition-fast);
      text-align: center;
      position: relative;
      background: var(--bg-tertiary);
    }
.chart-quiz-option:hover { border-color: var(--border-light); transform: translateY(-1px); }
.chart-quiz-option.correct {
      border-color: var(--success) !important;
      background: rgba(46,204,113,0.08);
      box-shadow: 0 0 12px rgba(46,204,113,0.2);
    }
.chart-quiz-option.incorrect {
      border-color: var(--danger) !important;
      background: rgba(231,76,60,0.08);
      animation: shake 0.4s ease;
    }
.chart-quiz-option svg { width: 100%; height: auto; }
.chart-quiz-label {
      position: absolute;
      top: 0.5rem;
      left: 0.5rem;
      width: 24px;
      height: 24px;
      background: var(--gold);
      color: var(--text-inverse);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      font-weight: 700;
    }
.quiz-options { padding: 0 1.5rem 1rem; }
.quiz-option {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.875rem 1rem;
      margin: 0.5rem 0;
      background: var(--bg-tertiary);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: all var(--transition-fast);
    }
.quiz-option:hover { border-color: var(--border-light); background: var(--bg-card-hover); }
.quiz-option.correct {
      border-color: var(--success);
      background: rgba(46,204,113,0.08);
    }
.quiz-option.incorrect {
      border-color: var(--danger);
      background: rgba(231,76,60,0.08);
      animation: shake 0.4s ease;
    }
@keyframes shake {
      0%, 100% { transform: translateX(0); }
      20% { transform: translateX(-6px); }
      40% { transform: translateX(6px); }
      60% { transform: translateX(-4px); }
      80% { transform: translateX(4px); }
    }
.quiz-option.dimmed { opacity: 0.5; }
.quiz-option-letter {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.75rem;
      color: var(--text-muted);
      flex-shrink: 0;
    }
.quiz-option.correct .quiz-option-letter {
      background: var(--success);
      border-color: var(--success);
      color: #fff;
    }
.quiz-option.incorrect .quiz-option-letter {
      background: var(--danger);
      border-color: var(--danger);
      color: #fff;
    }
.quiz-option-text { font-size: 0.9375rem; color: var(--text-secondary); }
.quiz-tf-list { padding: 0 1.5rem 1rem; }
.quiz-tf-row {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.75rem 0;
      border-bottom: 1px solid var(--border-color);
    }
.quiz-tf-row:last-child { border-bottom: none; }
.quiz-tf-text { flex: 1; font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.5; }
.quiz-tf-buttons { display: flex; gap: 0.375rem; flex-shrink: 0; }
.quiz-tf-btn {
      padding: 0.375rem 0.875rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: var(--bg-tertiary);
      color: var(--text-secondary);
      font-size: 0.8125rem;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition-fast);
    }
.quiz-tf-btn:hover { border-color: var(--gold); color: var(--gold); }
.quiz-tf-btn.correct { background: var(--success); border-color: var(--success); color: #fff; }
.quiz-tf-btn.incorrect { background: var(--danger); border-color: var(--danger); color: #fff; }
.quiz-tf-btn:disabled { cursor: default; opacity: 0.7; }
.quiz-tf-result { width: 28px; text-align: center; flex-shrink: 0; }
.quiz-match-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0.75rem;
      padding: 0 1.5rem 0.5rem;
    }
.quiz-match-col { display: flex; flex-direction: column; gap: 0.5rem; }
.quiz-match-item {
      padding: 0.75rem 1rem;
      background: var(--bg-tertiary);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      font-size: 0.875rem;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all var(--transition-fast);
      line-height: 1.5;
    }
.quiz-match-item:hover { border-color: var(--border-light); }
.quiz-match-source.selected { border-color: var(--gold); background: var(--gold-glow); color: var(--gold); }
.quiz-match-item.matched {
      border-color: var(--success);
      background: rgba(46,204,113,0.08);
      color: var(--success);
      cursor: default;
    }
.quiz-match-item.wrong-flash {
      animation: wrongFlash 0.6s ease;
    }
@keyframes wrongFlash {
      0%, 100% { border-color: var(--border-color); }
      25%, 75% { border-color: var(--danger); background: rgba(231,76,60,0.1); }
    }
.quiz-match-instructions {
      padding: 0.5rem 1.5rem 1rem;
      font-size: 0.8125rem;
      color: var(--text-muted);
      font-style: italic;
    }
.quiz-fill-template {
      padding: 1rem 1.5rem;
      font-size: 1.0625rem;
      color: var(--text-secondary);
      line-height: 2.2;
    }
.quiz-fill-slot {
      display: inline-block;
      min-width: 100px;
      padding: 0.2rem 0.75rem;
      background: var(--bg-tertiary);
      border: 2px dashed var(--border-color);
      border-radius: var(--radius-sm);
      color: var(--text-muted);
      font-size: 0.9375rem;
      font-weight: 600;
      text-align: center;
      cursor: pointer;
      transition: all 0.2s ease;
      vertical-align: middle;
      margin: 0 0.15rem;
    }
.quiz-fill-slot:hover { border-color: var(--gold); background: rgba(212,168,67,0.05); }
.quiz-fill-slot.filled {
      border-style: solid;
      border-color: var(--gold);
      background: rgba(212,168,67,0.1);
      color: var(--gold);
    }
.quiz-fill-slot.correct {
      border-color: var(--success) !important;
      background: rgba(46,204,113,0.12) !important;
      color: var(--success) !important;
    }
.quiz-fill-slot.incorrect {
      border-color: var(--danger) !important;
      background: rgba(231,76,60,0.12) !important;
      color: var(--danger) !important;
      text-decoration: line-through;
    }
.quiz-fill-hint {
      display: inline-block;
      color: var(--success);
      font-size: 0.8125rem;
      font-weight: 700;
      margin-left: 0.25rem;
      vertical-align: middle;
    }
.quiz-fill-bank {
      padding: 0.75rem 1.5rem 1rem;
    }
.quiz-fill-bank-label {
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
    }
.quiz-fill-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
.quiz-fill-chip {
      display: inline-block;
      padding: 0.375rem 1rem;
      background: linear-gradient(135deg, var(--bg-tertiary), rgba(212,168,67,0.08));
      border: 2px solid var(--border-color);
      border-radius: 20px;
      color: var(--text-primary);
      font-size: 0.9375rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
      user-select: none;
    }
.quiz-fill-chip:hover {
      border-color: var(--gold);
      background: rgba(212,168,67,0.15);
      transform: translateY(-1px);
    }
.quiz-fill-chip.selected {
      border-color: var(--gold);
      background: var(--gold-glow);
      color: var(--gold);
      box-shadow: 0 0 12px rgba(212,168,67,0.3);
    }
.quiz-fill-chip.used {
      opacity: 0.35;
      pointer-events: auto;
      cursor: pointer;
      border-style: dashed;
      transform: none;
    }
.quiz-fill-chip.used:hover {
      opacity: 0.6;
    }
.quiz-gate-text { color: var(--text-secondary); font-size: 0.875rem; margin-top: 0.5rem; }
@keyframes scaleIn { from { transform: scale(0.8); opacity: 0; } to { transform: scale(1); opacity: 1; } }
@keyframes bounceIn { 0%{transform:scale(0)} 60%{transform:scale(1.2)} 100%{transform:scale(1)} }
@keyframes pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.05)} }
@media (max-width: 640px) {
.chart-quiz-grid { grid-template-columns: 1fr; }
.quiz-match-container { grid-template-columns: 1fr; }
.quiz-tf-row { flex-wrap: wrap; }
.quiz-tf-text { flex-basis: 100%; margin-bottom: 0.375rem; }
}
@keyframes skeletonShimmer {
      0% { background-position: 200% 0; }
      100% { background-position: -200% 0; }
    }
.glossary-term {
      color: var(--gold-light);
      border-bottom: 1px dotted var(--gold);
      cursor: help;
      position: relative;
      transition: color var(--transition-fast);
    }
.glossary-term:hover, .glossary-term:focus {
      color: var(--gold);
    }
.glossary-term:hover::after, .glossary-term:focus::after {
      content: attr(data-tooltip);
      position: absolute;
      bottom: calc(100% + 8px);
      left: 0;
      transform: none;
      background: var(--bg-card);
      border: 1px solid var(--gold);
      border-radius: var(--radius-md);
      padding: 0.75rem 1rem;
      font-size: 0.8125rem;
      font-weight: 400;
      color: var(--text-secondary);
      line-height: 1.5;
      width: max-content;
      max-width: 320px;
      z-index: 100;
      box-shadow: 0 8px 24px rgba(0,0,0,0.4);
      pointer-events: none;
      animation: tooltipFadeIn 0.15s ease;
    }
.glossary-term:hover::before, .glossary-term:focus::before {
      content: '';
      position: absolute;
      bottom: calc(100% + 2px);
      left: 0.75rem;
      transform: none;
      border: 6px solid transparent;
      border-top-color: var(--gold);
      z-index: 101;
      pointer-events: none;
    }
@keyframes tooltipFadeIn {
      from { opacity: 0; transform: translateX(-50%) translateY(4px); }
      to { opacity: 1; transform: translateX(-50%) translateY(0); }
    }
.deep-dive-block {
      margin: 2rem 0;
      border: 1px solid rgba(59, 130, 246, 0.3);
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: var(--bg-card);
    }
.deep-dive-toggle {
      width: 100%;
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 1rem 1.25rem;
      background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(59, 130, 246, 0.04));
      border: none;
      cursor: pointer;
      color: var(--text-primary);
      font-size: 0.9375rem;
      font-weight: 600;
      text-align: left;
      transition: all var(--transition-fast);
    }
.deep-dive-toggle:hover {
      background: linear-gradient(135deg, rgba(59, 130, 246, 0.14), rgba(59, 130, 246, 0.08));
    }
.deep-dive-icon { font-size: 1.25rem; flex-shrink: 0; }
.deep-dive-title { flex: 1; }
.deep-dive-badge {
      font-size: 0.6875rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: #3b82f6;
      background: rgba(59, 130, 246, 0.15);
      padding: 0.2rem 0.5rem;
      border-radius: 100px;
    }
.deep-dive-chevron {
      font-size: 0.75rem;
      color: var(--text-muted);
      transition: transform 0.3s ease;
      flex-shrink: 0;
    }
.deep-dive-block.open .deep-dive-chevron {
      transform: rotate(180deg);
    }
.deep-dive-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
      padding: 0 1.5rem;
    }
.deep-dive-block.open .deep-dive-content {
      max-height: 3000px;
      padding: 1.25rem 1.5rem;
      border-top: 1px solid rgba(59, 130, 246, 0.2);
    }
.deep-dive-content p { color: var(--text-secondary); }
.deep-dive-content h3 { color: #60a5fa; }
.scenario-block {
      margin: 2.5rem 0;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      position: relative;
    }
.scenario-block::before {
      content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, var(--gold), var(--info), var(--gold));
      opacity: 0; transition: opacity 0.3s ease;
    }
.scenario-block:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 30px rgba(0,0,0,0.3), 0 0 20px rgba(52,152,219,0.08);
      border-color: rgba(52,152,219,0.3);
    }
.scenario-block:hover::before { opacity: 1; }
.scenario-header {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 1rem 1.5rem;
      background: linear-gradient(90deg, #1a1a2e, #1e2138, #1a1a2e);
      background-size: 200% 100%;
      border-bottom: 1px solid var(--border-color);
    }
.scenario-icon { font-size: 1.5rem; }
.scenario-label {
      font-size: 0.6875rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--gold);
    }
.scenario-title {
      font-size: 1.0625rem;
      font-weight: 600;
      color: #f3f4f8; /* the header is always navy, in both themes */
    }
.scenario-situation {
      padding: 1.25rem 1.5rem 0.75rem;
      color: var(--text-secondary);
      font-size: 0.9375rem;
      line-height: 1.7;
    }
.scenario-prompt {
      padding: 0 1.5rem 0.75rem;
      font-size: 0.8125rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--text-muted);
    }
.scenario-options {
      padding: 0 1.5rem 1.5rem;
    }
.scenario-option {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      width: 100%;
      padding: 0.875rem 1.25rem;
      margin-bottom: 0.5rem;
      background: var(--bg-tertiary);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      cursor: pointer;
      color: var(--text-primary);
      font-size: 0.9375rem;
      font-weight: 500;
      text-align: left;
      transition: all var(--transition-fast);
    }
.scenario-option:hover:not(:disabled) {
      border-color: var(--gold);
      background: rgba(212, 168, 67, 0.08);
      transform: translateX(4px);
    }
.scenario-option:disabled { cursor: default; opacity: 0.6; }
.scenario-option.selected {
      border-color: var(--gold);
      background: rgba(212, 168, 67, 0.12);
      opacity: 1 !important;
    }
.scenario-option.dimmed { opacity: 0.4; }
.scenario-opt-letter {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: rgba(255,255,255,0.06);
      border: 1px solid var(--border-color);
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--text-muted);
      flex-shrink: 0;
    }
.scenario-option.selected .scenario-opt-letter {
      background: var(--gold);
      border-color: var(--gold);
      color: var(--text-inverse);
    }
.scenario-feedback {
      display: none;
      padding: 1rem 1.25rem;
      margin-bottom: 0.5rem;
      border-radius: var(--radius-md);
      animation: fadeSlideIn 0.3s ease;
    }
.scenario-feedback.visible { display: block; }
.scenario-fb-emoji { font-size: 1.25rem; margin-right: 0.5rem; }
.scenario-fb-label { font-weight: 700; font-size: 0.9375rem; }
.scenario-fb-text { margin-top: 0.5rem; color: var(--text-secondary); font-size: 0.875rem; line-height: 1.6; }
.scenario-best { background: rgba(46, 204, 113, 0.1); border: 1px solid rgba(46, 204, 113, 0.3); }
.scenario-best .scenario-fb-label { color: var(--success); }
.scenario-smart { background: rgba(52, 152, 219, 0.1); border: 1px solid rgba(52, 152, 219, 0.3); }
.scenario-smart .scenario-fb-label { color: var(--info); }
.scenario-ok { background: rgba(212, 168, 67, 0.1); border: 1px solid rgba(212, 168, 67, 0.3); }
.scenario-ok .scenario-fb-label { color: var(--gold); }
.scenario-risky { background: rgba(243, 156, 18, 0.1); border: 1px solid rgba(243, 156, 18, 0.3); }
.scenario-risky .scenario-fb-label { color: #f39c12; }
.scenario-bad { background: rgba(231, 76, 60, 0.1); border: 1px solid rgba(231, 76, 60, 0.3); }
.scenario-bad .scenario-fb-label { color: var(--danger); }
.takeaway-block {
      margin: 2.5rem 0;
      background: linear-gradient(135deg, rgba(46,204,113,0.06), rgba(52,152,219,0.06));
      border: 1px solid rgba(46,204,113,0.25);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      position: relative;
    }
.takeaway-block::before {
      content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, var(--success), #3498db, var(--success));
      opacity: 0; transition: opacity 0.3s ease;
    }
.takeaway-block:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 30px rgba(46,204,113,0.1);
      border-color: rgba(46,204,113,0.4);
    }
.takeaway-block:hover::before { opacity: 1; }
.takeaway-header {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 1rem 1.5rem;
      background: rgba(46, 204, 113, 0.08);
      border-bottom: 1px solid rgba(46, 204, 113, 0.15);
    }
.takeaway-icon { font-size: 1.25rem; }
.takeaway-title {
      font-size: 0.9375rem;
      font-weight: 700;
      color: var(--success);
      text-transform: uppercase;
      letter-spacing: 0.06em;
    }
.takeaway-items { padding: 1rem 1.5rem; }
.takeaway-item {
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
      padding: 0.75rem 0;
      border-bottom: 1px solid rgba(46, 204, 113, 0.1);
    }
.takeaway-item:last-child { border-bottom: none; }
.takeaway-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 26px;
      height: 26px;
      min-width: 26px;
      border-radius: 50%;
      background: var(--success);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      margin-top: 1px;
    }
.takeaway-text {
      color: var(--text-secondary);
      font-size: 0.9375rem;
      line-height: 1.6;
    }
.takeaway-text strong { color: var(--text-primary); }
.practice-block {
      margin: 2.5rem 0;
      background: linear-gradient(135deg, rgba(155,89,182,0.06), rgba(52,152,219,0.06));
      border: 1px solid rgba(155,89,182,0.25);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      position: relative;
    }
.practice-block::before {
      content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, #9b59b6, #3498db, #9b59b6);
      opacity: 0; transition: opacity 0.3s ease;
    }
.practice-block:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 30px rgba(155,89,182,0.1);
      border-color: rgba(155,89,182,0.4);
    }
.practice-block:hover::before { opacity: 1; }
.practice-header {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 1rem 1.5rem;
      background: rgba(155, 89, 182, 0.08);
      border-bottom: 1px solid rgba(155, 89, 182, 0.15);
    }
.practice-icon { font-size: 1.25rem; }
.practice-title {
      font-size: 0.9375rem;
      font-weight: 700;
      color: var(--purple, #9b59b6);
      text-transform: uppercase;
      letter-spacing: 0.06em;
    }
.practice-badge {
      margin-left: auto;
      background: rgba(155, 89, 182, 0.15);
      color: var(--purple, #9b59b6);
      font-size: 0.6875rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      padding: 0.2rem 0.6rem;
      border-radius: 100px;
    }
.practice-situation {
      padding: 1.25rem 1.5rem 0.5rem;
      color: var(--text-secondary);
      font-size: 0.9375rem;
      line-height: 1.7;
      font-style: italic;
    }
.practice-tasks {
      padding: 0.75rem 1.5rem 1rem;
    }
.practice-tasks-label {
      font-size: 0.8125rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: var(--purple, #9b59b6);
      margin-bottom: 0.5rem;
    }
.practice-task {
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
      padding: 0.625rem 0;
      border-bottom: 1px solid rgba(155, 89, 182, 0.1);
    }
.practice-task:last-child { border-bottom: none; }
.practice-task-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 24px;
      height: 24px;
      min-width: 24px;
      border-radius: 50%;
      background: #9b59b6;
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      margin-top: 1px;
    }
.practice-task-text {
      color: var(--text-secondary);
      font-size: 0.9375rem;
      line-height: 1.6;
    }
.practice-hint, .practice-answer {
      padding: 0 1.5rem 1rem;
    }
.practice-hint-btn, .practice-answer-btn {
      display: inline-block;
      background: rgba(155, 89, 182, 0.1);
      color: var(--purple, #9b59b6);
      border: 1px solid rgba(155, 89, 182, 0.25);
      border-radius: var(--radius-sm);
      padding: 0.375rem 1rem;
      font-size: 0.8125rem;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition-fast);
    }
.practice-hint-btn:hover, .practice-answer-btn:hover {
      background: rgba(155, 89, 182, 0.2);
    }
.practice-answer-btn {
      background: rgba(46, 204, 113, 0.1);
      color: var(--success);
      border-color: rgba(46, 204, 113, 0.25);
    }
.practice-answer-btn:hover { background: rgba(46, 204, 113, 0.2); }
.practice-hint-text, .practice-answer-text {
      display: none;
      margin-top: 0.75rem;
      padding: 0.75rem 1rem;
      background: rgba(155, 89, 182, 0.06);
      border-radius: var(--radius-sm);
      color: var(--text-secondary);
      font-size: 0.9375rem;
      line-height: 1.6;
      border-left: 3px solid #9b59b6;
    }
.practice-answer-text {
      background: rgba(46, 204, 113, 0.06);
      border-left-color: var(--success);
    }
.practice-hint.revealed .practice-hint-text,
    .practice-answer.revealed .practice-answer-text {
      display: block;
    }
.practice-hint.revealed .practice-hint-btn,
    .practice-answer.revealed .practice-answer-btn {
      opacity: 0.5;
    }
.formula-block {
      margin: 2.5rem 0;
      background: linear-gradient(135deg, rgba(230,126,34,0.06), rgba(212,168,67,0.06));
      border: 1px solid rgba(230,126,34,0.25);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      position: relative;
    }
.formula-block::before {
      content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, #e67e22, var(--gold), #e67e22);
      opacity: 0; transition: opacity 0.3s ease;
    }
.formula-block:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 30px rgba(230,126,34,0.1);
      border-color: rgba(230,126,34,0.4);
    }
.formula-block:hover::before { opacity: 1; }
.formula-header {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.875rem 1.5rem;
      background: rgba(230, 126, 34, 0.08);
      border-bottom: 1px solid rgba(230, 126, 34, 0.15);
    }
.formula-icon { font-size: 1.1rem; }
.formula-title {
      font-size: 0.8125rem;
      font-weight: 700;
      color: #e67e22;
      text-transform: uppercase;
      letter-spacing: 0.08em;
    }
.formula-display {
      padding: 1.25rem 1.5rem;
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--text-primary);
      text-align: center;
      letter-spacing: 0.02em;
      font-family: var(--font-mono);
      background: rgba(230, 126, 34, 0.04);
      border-bottom: 1px solid rgba(230, 126, 34, 0.1);
    }
.formula-parts {
      padding: 1rem 1.5rem;
    }
.formula-parts-label {
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
    }
.formula-part {
      display: flex;
      align-items: baseline;
      gap: 0.75rem;
      padding: 0.375rem 0;
    }
.formula-part-term {
      font-family: var(--font-mono);
      font-weight: 700;
      color: #e67e22;
      font-size: 0.9375rem;
      min-width: 80px;
    }
.formula-part-desc {
      color: var(--text-secondary);
      font-size: 0.875rem;
      line-height: 1.5;
    }
.formula-example {
      padding: 0.75rem 1.5rem;
      background: rgba(230, 126, 34, 0.04);
      border-top: 1px solid rgba(230, 126, 34, 0.1);
    }
.formula-example-label {
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: #e67e22;
    }
.formula-example span {
      font-size: 0.875rem;
      color: var(--text-secondary);
    }
.formula-note {
      padding: 0.75rem 1.5rem 1rem;
      font-size: 0.8125rem;
      color: var(--text-muted);
      font-style: italic;
    }
@keyframes milestoneGlow {
      0% { box-shadow: 0 0 0 0 rgba(212, 168, 67, 0.4); }
      50% { box-shadow: 0 0 20px 4px rgba(212, 168, 67, 0.2); }
      100% { box-shadow: 0 0 0 0 transparent; }
    }
@media (max-width: 640px) {
.glossary-term:hover::after, .glossary-term:focus::after {
        left: 0;
        transform: none;
        max-width: calc(100vw - 3rem);
        font-size: 0.75rem;
      }
.glossary-term:hover::before, .glossary-term:focus::before {
        left: 1rem;
        transform: none;
      }
.scenario-option { padding: 0.75rem 1rem; font-size: 0.875rem; }
.scenario-options { padding: 0 1rem 1rem; }
.scenario-header { padding: 0.875rem 1rem; }
.scenario-situation { padding: 1rem 1rem 0.5rem; }
.takeaway-items { padding: 0.75rem 1rem; }
.deep-dive-toggle { padding: 0.875rem 1rem; font-size: 0.875rem; }
.practice-header, .formula-header { padding: 0.75rem 1rem; }
.practice-tasks, .practice-hint, .practice-answer { padding: 0.75rem 1rem; }
.formula-display { padding: 1rem; font-size: 0.9375rem; }
.formula-parts { padding: 0.75rem 1rem; }
.formula-part { flex-direction: column; gap: 0.125rem; }
.formula-part-term { min-width: auto; }
}
.eli5-toggle { padding: 0.375rem 0.75rem; font-size: 0.8125rem; background: var(--bg-tertiary); border: 1px solid var(--border-color); border-radius: var(--radius-sm); color: var(--text-muted); cursor: pointer; transition: all var(--transition-base); }
.eli5-toggle:hover { border-color: #f59e0b; color: #f59e0b; background: rgba(245,158,11,0.08); }
.eli5-toggle.active { background: linear-gradient(135deg, rgba(245,158,11,0.15), rgba(249,115,22,0.1)); border-color: #f59e0b; color: #f59e0b; font-weight: 600; box-shadow: 0 0 12px rgba(245,158,11,0.2); }
.eli5-block { display: none; }
.eli5-mode .eli5-block { display: block; margin: 1.25rem 0; border-radius: 16px; background: linear-gradient(135deg, rgba(245,158,11,0.08), rgba(249,115,22,0.05)); border: 2px solid rgba(245,158,11,0.25); padding: 0; overflow: hidden; animation: eli5FadeIn 0.4s ease; transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease; position: relative; }
.eli5-block::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, #f59e0b, #f97316, #f59e0b); opacity: 0; transition: opacity 0.3s ease; }
.eli5-block:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(245,158,11,0.1); border-color: rgba(245,158,11,0.4); }
.eli5-block:hover::before { opacity: 1; }
.eli5-block-header { display: flex; align-items: center; gap: 0.5rem; padding: 0.75rem 1.25rem; background: rgba(245,158,11,0.1); border-bottom: 1px solid rgba(245,158,11,0.15); }
.eli5-block-icon { font-size: 1.3rem; }
.eli5-block-label { font-weight: 700; color: #f59e0b; font-size: 0.875rem; text-transform: uppercase; letter-spacing: 0.5px; }
.eli5-block-content { padding: 1rem 1.25rem; font-size: 1.1rem; line-height: 1.9; color: var(--text-primary); }
.eli5-block-content p { margin-bottom: 0.75rem; }
.eli5-block-content strong { color: #f59e0b; }
@keyframes eli5FadeIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
.lesson-content.eli5-mode { font-size: 1.1rem; line-height: 1.85; }
.lesson-content.eli5-mode .callout-warning, .lesson-content.eli5-mode .key-concept { font-size: 1.05rem; }
.lesson-content.eli5-mode .deep-dive-block { display: none; }
.lesson-content.eli5-mode table { font-size: 0.95rem; }
.lesson-content.eli5-mode blockquote { font-size: 1.05rem; border-left: 3px solid #f59e0b; padding-left: 1rem; }
.lesson-content.eli5-mode h2 { font-size: 1.5rem; }
.lesson-content.eli5-mode h3 { font-size: 1.25rem; }
.eli5-term { border-bottom: 2px dotted #f59e0b; cursor: help; position: relative; color: #f59e0b; font-weight: 600; transition: color 0.2s; }
.eli5-term:hover { color: #fbbf24; }
.eli5-term .eli5-tip { display: none; position: absolute; bottom: calc(100% + 8px); left: 50%; transform: translateX(-50%); background: #1c1c2e; border: 1px solid rgba(245,158,11,0.3); border-radius: 12px; padding: 0.75rem 1rem; font-size: 0.875rem; font-weight: 400; color: var(--text-primary); line-height: 1.5; min-width: 220px; max-width: 320px; z-index: 100; box-shadow: 0 8px 24px rgba(0,0,0,0.4); pointer-events: none; white-space: normal; }
.eli5-term .eli5-tip::after { content: ''; position: absolute; top: 100%; left: 50%; transform: translateX(-50%); border: 6px solid transparent; border-top-color: rgba(245,158,11,0.3); }
.eli5-term:hover .eli5-tip { display: block; animation: eli5FadeIn 0.2s ease; }
.scenario-option {
      position: relative; overflow: hidden;
    }
.scenario-option::after {
      content: ''; position: absolute; inset: 0;
      background: linear-gradient(90deg, transparent, rgba(212,168,67,0.05), transparent);
      transform: translateX(-100%); transition: transform 0.5s ease;
    }
.scenario-option:hover::after { transform: translateX(100%); }
.practice-task-num, .takeaway-num {
      animation: numPulse 2s ease-in-out infinite;
    }
@keyframes numPulse {
      0%, 100% { box-shadow: 0 2px 8px rgba(46,204,113,0.3); }
      50% { box-shadow: 0 2px 16px rgba(46,204,113,0.5); }
    }
.practice-task-num {
      animation-name: numPulsePurple;
    }
@keyframes numPulsePurple {
      0%, 100% { box-shadow: 0 2px 8px rgba(155,89,182,0.3); }
      50% { box-shadow: 0 2px 16px rgba(155,89,182,0.5); }
    }