/* ═══════════════════════════════════════════════════════════════
   css/blocks.css — Canonical CSS for block content rendering.
   Single source of truth for both legacy app and Studio.
   
   Legacy: <link rel="stylesheet" href="css/blocks.css"> in index.html
   Studio: import '../../css/blocks.css' in studio/src/main.tsx
   ═══════════════════════════════════════════════════════════════ */

/* ── Heading ───────────────────────────────────────────────── */
.block-heading {
  color: var(--text-main, #1a1a2e);
  margin: 32px 0 12px;
  line-height: 1.3;
}
.block-heading-2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.block-heading-3 {
  font-size: 1.15rem;
  font-weight: 600;
}

/* ── Paragraph ─────────────────────────────────────────────── */
.block-paragraph {
  margin: 0 0 16px;
  line-height: 1.7;
  color: var(--text-main, #1a1a2e);
}
.block-paragraph code {
  background: var(--bg-secondary, #f0f0f5);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: 'Courier New', Courier, monospace;
}

/* ── List ──────────────────────────────────────────────────── */
.block-list {
  margin: 0 0 16px;
  padding-left: 24px;
  line-height: 1.7;
}
.block-list-item {
  margin-bottom: 4px;
}
.block-list-ordered {
  list-style-type: decimal;
}
.block-list-unordered {
  list-style-type: disc;
}

/* ── Formula ───────────────────────────────────────────────── */
.block-formula-display {
  text-align: center;
  padding: 20px 0;
  margin: 24px 0;
  overflow-x: auto;
}
.block-formula-inline {
  display: inline;
}
.block-formula-box {
  padding: 24px 32px;
  background: var(--bg-app, #f8f8fc);
  border: 1px solid var(--border, #e0e0e8);
  border-radius: 12px;
  text-align: center;
  font-size: 1.25rem;
  margin: 32px 0;
}

/* ── Callout ───────────────────────────────────────────────── */
.block-callout {
  padding: 24px 28px;
  border-radius: 12px;
  border: 1px solid var(--border, #e0e0e8);
  margin: 24px 0;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.block-callout-icon {
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
}
.block-callout-body {
  flex: 1;
  min-width: 0;
}
.block-callout-label {
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.block-callout-text {
  line-height: 2;
  font-size: 0.95rem;
}
/* Variants */
.block-callout-tip {
  background: rgba(34, 197, 94, 0.06);
}
.block-callout-tip .block-callout-label {
  color: var(--success, #22c55e);
}
.block-callout-warning {
  background: rgba(245, 158, 11, 0.06);
}
.block-callout-warning .block-callout-label {
  color: var(--warning, #f59e0b);
}
.block-callout-important {
  background: rgba(239, 68, 68, 0.04);
}
.block-callout-important .block-callout-label {
  color: var(--danger, #ef4444);
}
.block-callout-note {
  background: rgba(108, 43, 255, 0.04);
}
.block-callout-note .block-callout-label {
  color: var(--primary, #6c2bff);
}

/* ── Image ─────────────────────────────────────────────────── */
.block-image {
  margin: 24px 0;
}
.block-image-figure {
  display: inline-block;
  width: 100%;
  margin: 0;
}
.block-image-img {
  width: 100%;
  border-radius: 8px;
  display: block;
}
.block-image-caption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary, #6b7280);
  margin-top: 8px;
}

/* ── Source (fuente) ─────────────────────────────────────────
   Va pegada al dato o al texto que respalda. Gris propio y no
   --text-secondary, que da 3.22:1 sobre el fondo y no pasa AA:
   los mismos tonos de --doc-muted (css/pages/doc.css). */
.block-source {
  margin: -8px 0 16px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: #5F5B57;
}
.block-source-label {
  font-weight: 600;
}
[data-theme="dark"] .block-source {
  color: #A5A3B4;
}

.block-image-placeholder {
  width: 100%;
  min-height: 120px;
  background: var(--bg-secondary, #f0f0f5);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted, #9ca3af);
  font-size: 0.9rem;
  border: 1px dashed var(--border, #e0e0e8);
}

/* ── Table ─────────────────────────────────────────────────── */
.block-table-wrapper {
  overflow-x: auto;
  margin: 16px 0;
}
.block-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.block-table-th {
  border: 1px solid var(--border, #e0e0e8);
  padding: 8px 12px;
  background: var(--bg-secondary, #f0f0f5);
  font-weight: 600;
  text-align: left;
}
.block-table-td {
  border: 1px solid var(--border, #e0e0e8);
  padding: 8px 12px;
}

/* ── Definition ────────────────────────────────────────────── */
.block-definition {
  margin: 16px 0;
  padding-left: 16px;
  border-left: 3px solid var(--primary, #6c2bff);
}
.block-definition-term {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 4px;
}
.block-definition-text {
  margin: 0;
  line-height: 1.6;
}

/* ── Example ───────────────────────────────────────────────── */
.block-example {
  padding: 24px 28px;
  background: var(--bg-app, #f8f8fc);
  border-radius: 12px;
  border: 1px solid var(--border, #e0e0e8);
  margin: 24px 0;
}
.block-example-header {
  margin-bottom: 16px;
}
.block-example-title {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-main, #1a1a2e);
}
.block-example-steps {
  margin: 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.block-example-step {
  padding-left: 8px;
  min-width: 0; /* Fix flexbox overflow bug */
  max-width: 100%;
}
.block-example-step-label {
  display: block;
  font-weight: 700;
  color: var(--primary, #6c2bff);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.block-example-step-content {
  font-size: 0.95rem;
  line-height: 2.2;
  min-width: 0;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: normal;
  overflow-x: auto;
}

/* ── KaTeX sizing inside blocks ───────────────────────────── */
.block-example-step-content .katex,
.block-callout-text .katex {
  font-size: 1.15em;
}
.block-example-step-content .katex-display,
.block-callout-text .katex-display {
  margin: 12px 0;
}
.block-paragraph .katex { font-size: 1.1em; }
.block-list-item .katex { font-size: 1.1em; }

/* ── Unknown Block ─────────────────────────────────────────── */
.block-unknown {
  color: var(--danger, #ef4444);
  font-style: italic;
}

/* ── Mobile Responsive Adjustments ───────────────────────────── */
@media (max-width: 768px) {
  .block-heading {
    margin: 24px 0 12px;
  }
  .block-heading-2 {
    font-size: clamp(1.2rem, 5vw, 1.35rem);
  }
  .block-heading-3 {
    font-size: clamp(1.05rem, 4.5vw, 1.15rem);
  }
  
  .block-paragraph, .block-list {
    margin: 0 0 12px;
    font-size: 1rem;
    overflow-wrap: break-word;
    word-break: normal;
  }
  
  .block-formula-box {
    padding: 16px;
    font-size: 1.1rem;
    margin: 20px 0;
    overflow-x: auto;
  }
  
  .block-formula-display {
    padding: 12px 0;
    margin: 16px 0;
    overflow-x: auto;
  }
  
  .block-callout {
    padding: 16px;
    margin: 16px 0;
    gap: 12px;
  }
  
  .block-callout-text {
    overflow-wrap: break-word;
    word-break: normal;
  }
  
  .block-image {
    margin: 16px 0;
  }
  
  .block-definition {
    margin: 16px 0;
    padding-left: 12px;
  }
  
  .block-definition-text {
    overflow-wrap: break-word;
    word-break: normal;
  }
  
  .block-example {
    padding: 16px;
    margin: 16px 0;
    overflow-x: auto; /* Opción A: Scroll for overflow in entire block */
    position: relative;
  }

  /* Add subtle scrollbar for mobile to indicate scrollability */
  .block-example::-webkit-scrollbar,
  .block-formula-box::-webkit-scrollbar,
  .block-formula-display::-webkit-scrollbar {
    height: 4px;
  }
  .block-example::-webkit-scrollbar-thumb,
  .block-formula-box::-webkit-scrollbar-thumb,
  .block-formula-display::-webkit-scrollbar-thumb {
    background: var(--border, #e0e0e8);
    border-radius: 4px;
  }
  
  .block-example-steps {
    padding-left: 12px; /* Reduce indent */
  }
  
  /* Make sure code/pre tags wrap if possible, scroll otherwise */
  .block-paragraph code {
    overflow-wrap: break-word;
    word-break: normal;
    white-space: pre-wrap;
  }
}


/* ══════════════════════════════════════════════════════════════════════
   DARK MODE — Block content (extracted from learning.css in Round 11)
   ══════════════════════════════════════════════════════════════════════ */
/* ── KaTeX ── */
[data-theme="dark"] .katex,
[data-theme="dark"] .katex .base {
  color: var(--text-primary);
}

/* ── Blocks (lesson content) dark mode ── */
[data-theme="dark"] .block-heading,
[data-theme="dark"] .block-paragraph,
[data-theme="dark"] .block-list,
[data-theme="dark"] .block-list-item,
[data-theme="dark"] .block-definition-term,
[data-theme="dark"] .block-definition-text,
[data-theme="dark"] .block-example-title,
[data-theme="dark"] .block-example-step-content,
[data-theme="dark"] .block-example-step-label,
[data-theme="dark"] .block-callout-text,
[data-theme="dark"] .block-callout-label {
  color: var(--text-primary);
}

[data-theme="dark"] .block-example-step-label {
  color: var(--violet);
}

[data-theme="dark"] .block-paragraph code {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

[data-theme="dark"] .block-formula-box {
  background: var(--bg-secondary);
  border-color: var(--border);
}

[data-theme="dark"] .block-callout {
  border-color: var(--border);
}

[data-theme="dark"] .block-callout-tip {
  background: rgba(34, 197, 94, 0.08);
}

[data-theme="dark"] .block-callout-warning {
  background: rgba(245, 158, 11, 0.08);
}

[data-theme="dark"] .block-callout-important {
  background: rgba(239, 68, 68, 0.08);
}

[data-theme="dark"] .block-callout-note {
  background: rgba(108, 43, 255, 0.08);
}

[data-theme="dark"] .block-example {
  background: var(--bg-secondary);
  border-color: var(--border);
}

[data-theme="dark"] .block-table-th {
  background: var(--bg-secondary);
  border-color: var(--border);
  color: var(--text-primary);
}

[data-theme="dark"] .block-table-td {
  border-color: var(--border);
  color: var(--text-primary);
}

[data-theme="dark"] .block-image-placeholder {
  background: var(--bg-secondary);
  border-color: var(--border);
}

[data-theme="dark"] .block-image-caption {
  color: var(--text-secondary);
}

[data-theme="dark"] .block-definition {
  border-left-color: var(--violet);
}

/* ── Gráficas (:::chart) ──────────────────────────────────────────────────────
   El SVG lo dibuja js/utils/chartRenderer.js sobre el marcador que deja
   shared/blockCore.mjs. Los colores de serie viven en el JS —son valores
   validados contra cada superficie, no un volteo del CSS—; aquí solo van
   la tinta, la rejilla y el movimiento. */

.block-chart {
  margin: 24px 0;
  /* La gráfica nunca empuja la página a scroll horizontal. */
  overflow-x: auto;
  overscroll-behavior-x: contain;
}

.block-chart-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.chart-lienzo {
  /* Tokens que el SVG consume por var(). */
  --chart-superficie: var(--bg-white);
  --chart-ink: var(--text-primary);
  --chart-ink-secondary: var(--text-secondary);
  --chart-ink-muted: var(--text-secondary);
  --chart-grid: rgba(0, 0, 0, 0.08);
  min-width: 320px;
}

[data-theme="dark"] .chart-lienzo {
  --chart-grid: rgba(255, 255, 255, 0.10);
}

.chart-svg { display: block; }

/* Tipografía del dibujo: tokens de texto, nunca el color de la serie. */
.chart-tick  { font-size: 11px; }
.chart-valor { font-size: 11px; font-weight: 600; }

/* ── Leyenda ── */
.chart-leyenda {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: 12px;
  padding-left: 4px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.chart-leyenda-item { display: inline-flex; align-items: center; gap: 7px; }

.chart-leyenda-marca {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* ── Entrada ──
   Nada aparece de la nada: las barras crecen desde la línea base y los trazos
   se dibujan. Curva ease-out fuerte; las built-in de CSS no tienen punch. */

.chart-bar,
.chart-tajada,
.chart-punto,
.chart-linea,
.chart-valor {
  transition-timing-function: cubic-bezier(0.23, 1, 0.32, 1);
}

.block-chart .chart-bar {
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 480ms;
}
.block-chart.chart-animar .chart-bar { transform: scaleY(1); }

.block-chart .chart-linea {
  stroke-dasharray: 1200;
  stroke-dashoffset: 1200;
  transition: stroke-dashoffset 720ms;
}
.block-chart.chart-animar .chart-linea { stroke-dashoffset: 0; }

.block-chart .chart-punto,
.block-chart .chart-valor {
  opacity: 0;
  transition: opacity 360ms 260ms;
}
.block-chart.chart-animar .chart-punto,
.block-chart.chart-animar .chart-valor { opacity: 1; }

.block-chart .chart-tajada {
  opacity: 0;
  transform: scale(0.94);
  transform-origin: center;
  transition: opacity 420ms, transform 420ms;
}
.block-chart.chart-animar .chart-tajada { opacity: 1; transform: scale(1); }

/* Hover: el SVG en HTML es interactivo; el <title> da el tooltip nativo. */
.chart-bar:hover, .chart-tajada:hover { filter: brightness(1.08); cursor: default; }
.chart-punto:hover { r: 6.5; cursor: default; }

/* Menos movimiento, no cero: se conserva el fundido, se quita el desplazamiento. */
@media (prefers-reduced-motion: reduce) {
  .block-chart .chart-bar    { transform: scaleY(1); transition: opacity 200ms; opacity: 0; }
  .block-chart .chart-linea  { stroke-dashoffset: 0; transition: opacity 200ms; opacity: 0; }
  .block-chart .chart-tajada { transform: scale(1); transition: opacity 200ms; }
  .block-chart.chart-animar .chart-bar,
  .block-chart.chart-animar .chart-linea { opacity: 1; }
}

/* La tabla se queda: es la alternativa accesible y el respaldo del aviso de
   contraste de la paleta clara. Secundaria, no protagonista. */
.chart-listo .block-table-wrapper {
  margin-top: 16px;
  opacity: 0.85;
}

/* ══════════════════════════════════════════════════════════════════════
   BLOQUES QUE SE RESPONDEN (solo en la lección; blockCore interactive:true)
   La lógica vive en js/utils/interactiveBlocks.js.

   Contraste medido sobre --bg-white (#FFF) y #1C1C26 en oscuro:
   - texto siempre en --text-primary; el verde y el rojo solo van en bordes,
     iconos y fondos, nunca como color de lectura.
   - --ix-ok-ink #15803D = 5.0:1 en claro; #4ADE80 = 9.6:1 en oscuro.
   - --ix-hint #5F5B57 = 6.6:1 (el mismo gris de .block-source), solo sobre
     el fondo del ejemplo; sobre el fondo teñido del predict el texto va en
     --text-primary (skills/impeccable craft-floor: nada de gris sobre color).
   ══════════════════════════════════════════════════════════════════════ */
.block-predict,
.block-match,
.block-example--reveal {
  --ix-accent: var(--module-color, var(--violet, #6C2BFF));
  --match-shadow: 0 1px 2px rgba(24, 22, 38, 0.06), 0 6px 14px -8px rgba(24, 22, 38, 0.28);
  --match-shadow-up: 0 2px 4px rgba(24, 22, 38, 0.08), 0 14px 24px -10px rgba(24, 22, 38, 0.38);
  --ix-line: rgba(43, 43, 43, 0.14);
  --ix-ok: #16A34A;
  --ix-ok-bg: #F0FDF4;
  --ix-ok-ink: #15803D;
  --ix-no: #DC2626;
  --ix-no-bg: #FEF2F2;
  --ix-hint: #5F5B57;
}
[data-theme="dark"] .block-predict,
[data-theme="dark"] .block-match,
[data-theme="dark"] .block-example--reveal {
  --match-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 6px 14px -8px rgba(0, 0, 0, 0.7);
  --match-shadow-up: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 14px 24px -10px rgba(0, 0, 0, 0.8);
  --ix-line: rgba(232, 230, 240, 0.16);
  --ix-ok: #22C55E;
  --ix-ok-bg: rgba(34, 197, 94, 0.12);
  --ix-ok-ink: #4ADE80;
  --ix-no: #F87171;
  --ix-no-bg: rgba(239, 68, 68, 0.12);
  --ix-hint: #A5A3B4;
}

/* ── Adivina primero ─────────────────────────────────────────── */
.block-predict {
  margin: 24px 0;
  padding: 20px;
  border: 1px solid var(--ix-line);
  border-radius: 16px;
  background: var(--module-color-light, var(--violet-light));
}
.block-predict-prompt {
  display: flex;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-primary);
}
.block-predict-icon {
  flex: none;
  font-size: 22px;
  line-height: 1.5;
  color: var(--ix-accent);
}
.block-predict-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.block-predict-option {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 52px;
  padding: 10px 14px 10px 10px;
  border: 1px solid var(--ix-line);
  border-radius: 12px;
  background: var(--bg-white, #FFF);
  box-shadow: var(--match-shadow);
  color: var(--text-primary);
  font: inherit;
  font-size: 0.975rem;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform 160ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)),
              box-shadow 200ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)),
              border-color 160ms ease, background-color 200ms ease, opacity 200ms ease;
}
.block-predict-text {
  min-width: 0;
  overflow-wrap: break-word;
}
/* Letra de color: un ancla para el ojo, no un significado. Tonos oscuros de
   la paleta de parejas para que la letra blanca pase 4.5:1 (5.0 a 7.1). */
.block-predict-key {
  flex: none;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--key, #6D28D9);
  color: #FFFFFF;
  font-size: 0.8125rem;
  font-weight: 800;
  line-height: 1;
}
.block-predict-option[data-index="0"] { --key: #6D28D9; }
.block-predict-option[data-index="1"] { --key: #0369A1; }
.block-predict-option[data-index="2"] { --key: #B45309; }
.block-predict-option[data-index="3"] { --key: #BE185D; }
.block-predict.is-answered .block-predict-option {
  box-shadow: none;
}
.block-predict-option.is-correct .block-predict-key { --key: #15803D; }
.block-predict-option.is-chosen:not(.is-correct) .block-predict-key { --key: #B91C1C; }
.block-predict-option.is-correct.is-chosen {
  animation: match-land 360ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-predict-option.is-chosen:not(.is-correct) {
  animation: match-nope 300ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-predict-option:active:not(:disabled) {
  transform: scale(0.97);
}
@media (hover: hover) and (pointer: fine) {
  .block-predict-option:hover:not(:disabled) {
    border-color: var(--ix-accent);
    box-shadow: var(--match-shadow-up);
  }
}
.block-predict-option:focus-visible {
  outline: 2px solid var(--ix-accent);
  outline-offset: 2px;
}
.block-predict-option:disabled {
  cursor: default;
}
.block-predict.is-answered .block-predict-option:not(.is-correct):not(.is-chosen) {
  opacity: 0.55;
}
.block-predict-option.is-correct {
  border-color: var(--ix-ok);
  background: var(--ix-ok-bg);
}
.block-predict-option.is-chosen:not(.is-correct) {
  border-color: var(--ix-no);
  background: var(--ix-no-bg);
}
.block-predict-option.is-correct::after,
.block-predict-option.is-chosen:not(.is-correct)::after {
  font-family: 'Material Symbols Outlined';
  font-size: 20px;
  margin-left: auto;
  line-height: 1;
}
.block-predict-option.is-correct::after { content: 'check_circle'; color: var(--ix-ok); }
.block-predict-option.is-chosen:not(.is-correct)::after { content: 'cancel'; color: var(--ix-no); }

.block-predict-feedback {
  margin: 12px 0 0;
  font-size: 0.875rem;
  color: var(--text-primary);
}
.block-predict.is-right .block-predict-feedback {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 6px;
  color: var(--ix-ok-ink);
  font-weight: 700;
}
.block-predict.is-right .block-predict-feedback::before {
  content: 'check_circle';
  font-family: 'Material Symbols Outlined';
  font-size: 20px;
  font-weight: 400;
  font-variation-settings: 'FILL' 1;
  color: var(--ix-ok);
}
.block-predict.is-wrong .block-predict-feedback {
  color: var(--text-primary);
  font-weight: 700;
}
.block-predict-explanation {
  margin: 8px 0 0;
  line-height: 1.6;
  color: var(--text-primary);
}

/* Lo que se destapa: entra desde abajo, corto, para que se note que es
   la respuesta y no un salto de página. */
.block-predict-rest.is-revealed,
.block-example-step.is-revealed {
  animation: ix-reveal 260ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
@keyframes ix-reveal {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Versión estática: vista previa de Studio (blockCore sin interactive). */
.block-predict-static-tag {
  margin: 0 0 8px;
  font-size: 0.8125rem;
  color: var(--text-primary);
}
.block-predict-static-list {
  margin: 0;
  padding-left: 22px;
  line-height: 1.6;
}
.block-predict-static.is-correct {
  font-weight: 600;
}

/* ── Ejemplo paso a paso ─────────────────────────────────────── */
.block-example-hint {
  display: block;
  margin-top: 4px;
  font-size: 0.8125rem;
  color: var(--ix-hint);
}
.block-example-next {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 16px;
  padding: 10px 16px;
  border: 1.5px solid var(--ix-accent);
  border-radius: 12px;
  background: var(--bg-white, #FFF);
  box-shadow: var(--match-shadow);
  color: var(--text-primary);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 160ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)), background-color 160ms ease;
}
.block-example-next:active {
  transform: scale(0.97);
}
@media (hover: hover) {
  .block-example-next:hover {
    background: var(--module-color-light, var(--violet-light));
  }
}
.block-example-next:focus-visible {
  outline: 2px solid var(--ix-accent);
  outline-offset: 2px;
}

@media (max-width: 768px) {
  .block-predict { padding: 16px; margin: 16px 0; }
}

@media (prefers-reduced-motion: reduce) {
  .block-predict-option,
  .block-example-next { transition: none; }
  .block-predict-rest.is-revealed,
  .block-example-step.is-revealed { animation: none; }
}

/* ── Reto rápido ──────────────────────────────────────────────
   La misma tarjeta que "Adivina primero", con más presencia: va cada 2 o 3
   diapositivas y tiene que sentirse como juego, no como otro párrafo.
   Fondo un punto más teñido del color de la materia; texto siempre en
   --text-primary (el color de la materia no se usa como color de lectura). */
.block-predict--reto {
  background: var(--module-color-medium, rgba(108, 43, 255, 0.15));
  border-color: var(--ix-accent);
  border-width: 1.5px;
}
.block-predict--reto .block-predict-icon {
  font-variation-settings: 'FILL' 1;
}
.block-predict--reto.is-answered {
  animation: reto-settle 320ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
@keyframes reto-settle {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.015); }
  100% { transform: scale(1); }
}
.block-reto-combo {
  display: inline-flex;
  align-items: center;
  margin-left: 6px;
  padding: 2px 10px;
  border-radius: 999px;
  /* #15803D con blanco = 5.0:1, igual en claro y en oscuro. */
  background: #15803D;
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 800;
  vertical-align: 1px;
  animation: combo-pop 380ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
@keyframes combo-pop {
  0%   { opacity: 0; transform: scale(0.7); }
  55%  { opacity: 1; transform: scale(1.12); }
  100% { transform: scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .block-predict--reto.is-answered,
  .block-predict-option.is-correct.is-chosen,
  .block-predict-option.is-chosen:not(.is-correct),
  .block-reto-combo { animation: none; }
}

/* ── Unir parejas ─────────────────────────────────────────────
   Una sola rejilla de dos columnas: cada casilla trae su fila en grid-row
   (blockCore), así las dos columnas comparten alto. Momento propio del juego
   (skills/impeccable animate + delight): al acertar, la ficha de la derecha
   viaja a la fila de su pareja (FLIP en interactiveBlocks.js) y aparece un
   eslabón verde que las une; al terminar, el tablero ya es la tabla.
   - Izquierda = ancla (peso 600, sin sombra que invite a moverla).
     Derecha = ficha (sombra suave con desplazamiento: se ve "suelta").
   - Texto siempre en --text-primary; los colores solo en bordes, fondos e
     iconos. Eslabón: icono blanco sobre el color de la pareja, de 3.0:1
     (ámbar) a 5.7:1 (violeta): ≥3:1, el mínimo para un icono.
   - Sin 3D de botón (se quitó de Skora en el rediseño de suscripción). */
.block-match {
  --match-gap: 12px;
  --match-shadow: 0 1px 2px rgba(24, 22, 38, 0.06), 0 6px 14px -8px rgba(24, 22, 38, 0.28);
  --match-shadow-up: 0 2px 4px rgba(24, 22, 38, 0.08), 0 14px 24px -10px rgba(24, 22, 38, 0.38);
  margin: 24px 0;
  padding: 20px;
  border: 1.5px solid var(--ix-accent);
  border-radius: 16px;
  background: var(--module-color-medium, rgba(108, 43, 255, 0.15));
  transition: border-color 240ms ease;
}
[data-theme="dark"] .block-match {
  --match-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 6px 14px -8px rgba(0, 0, 0, 0.7);
  --match-shadow-up: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 14px 24px -10px rgba(0, 0, 0, 0.8);
}
.block-match--static {
  padding: 0;
  border: 0;
  background: none;
}
.block-match-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 8px var(--match-gap);
  align-items: stretch;
}
.block-match-head {
  margin: 0;
  padding: 0 4px 2px;
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  align-self: end;
}
.block-match-item {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 12px 14px;
  border: 1px solid var(--ix-line);
  border-radius: 12px;
  background: var(--bg-white, #FFF);
  color: var(--text-primary);
  font: inherit;
  font-size: 0.9375rem;
  line-height: 1.35;
  text-align: left;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform 160ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)),
              box-shadow 200ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)),
              border-color 160ms ease, background-color 200ms ease;
}
.block-match-item[data-side="l"] {
  font-weight: 600;
}
/* El texto va en su propio span: si fuera hijo directo del botón (flex), cada
   trozo entre **negritas** se volvería una columna aparte. */
.block-match-text {
  min-width: 0;
  overflow-wrap: break-word;
  hyphens: auto;
}
/* Una fracción en línea sale diminuta a 0.9375rem: dentro de una casilla
   la fórmula es el contenido entero, así que va más grande. */
.block-match-item .katex {
  font-size: 1.3em;
}
.block-match-item[data-side="r"] {
  box-shadow: var(--match-shadow);
}
.block-match-item:active:not(:disabled) {
  transform: scale(0.97);
}
@media (hover: hover) and (pointer: fine) {
  .block-match-item:hover:not(:disabled):not(.is-selected) {
    border-color: var(--ix-accent);
  }
}
.block-match-item:focus-visible {
  outline: 2px solid var(--ix-accent);
  outline-offset: 2px;
}
/* Elegida: se levanta y se marca con el color de la materia. */
.block-match-item.is-selected {
  transform: translateY(-2px);
  border-color: var(--ix-accent);
  box-shadow: 0 0 0 2px var(--ix-accent), var(--match-shadow-up);
}
.block-match-item.is-selected:active {
  transform: translateY(-2px) scale(0.97);
}
/* Unida: se asienta (sin sombra, ya no se mueve) y toma el color de su
   pareja, en el orden en que se unen (interactiveBlocks.js PAIR_COLORS). El
   texto sigue en --text-primary: el color va en borde, fondo y eslabón.
   Fondo = 14 % del color sobre blanco (22 % sobre el fondo oscuro). */
.block-match-item[data-color="0"] { --pair: #7C3AED; }
.block-match-item[data-color="1"] { --pair: #0284C7; }
.block-match-item[data-color="2"] { --pair: #D97706; }
.block-match-item[data-color="3"] { --pair: #DB2777; }
.block-match-item[data-color="4"] { --pair: #059669; }
.block-match-item[data-color="5"] { --pair: #EA580C; }
.block-match-item.is-matched {
  border-color: var(--pair, var(--ix-ok));
  border-width: 1.5px;
  background: var(--ix-ok-bg);
  background: color-mix(in srgb, var(--pair, var(--ix-ok)) 14%, var(--bg-white, #FFF));
  box-shadow: none;
  cursor: default;
  animation: match-land 360ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
[data-theme="dark"] .block-match-item.is-matched {
  background: color-mix(in srgb, var(--pair, var(--ix-ok)) 22%, var(--bg-white, #1C1C26));
}
@keyframes match-land {
  0%   { transform: scale(1); }
  35%  { transform: scale(1.04); }
  100% { transform: scale(1); }
}
.match-particle {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  will-change: transform, opacity;
}
/* El eslabón: vive en la casilla izquierda y se asoma al hueco entre las dos. */
.block-match-item.is-matched[data-side="l"]::after {
  content: 'link';
  position: absolute;
  top: 50%;
  right: calc(-11px - var(--match-gap) / 2);
  z-index: 1;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--pair, var(--ix-ok));
  color: #FFFFFF;
  box-shadow: 0 0 0 3px var(--module-color-medium, rgba(108, 43, 255, 0.15));
  font-family: 'Material Symbols Outlined';
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  transform: translateY(-50%) rotate(-45deg);
  animation: match-link 260ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)) 120ms backwards;
}
@keyframes match-link {
  from { opacity: 0; transform: translateY(-50%) rotate(-45deg) scale(0.6); }
  to   { opacity: 1; transform: translateY(-50%) rotate(-45deg) scale(1); }
}
.block-match-item.is-wrong {
  border-color: var(--ix-no);
  background: var(--ix-no-bg);
  animation: match-nope 300ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
@keyframes match-nope {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  60% { transform: translateX(3px); }
}
.block-match-feedback {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 14px 0 0;
  font-size: 0.875rem;
  color: var(--text-primary);
}
.block-match.is-done {
  border-color: var(--ix-ok);
  animation: reto-settle 320ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-match.is-done .block-match-feedback {
  color: var(--ix-ok-ink);
  font-weight: 700;
}
.block-match.is-done .block-match-feedback::before {
  content: 'check_circle';
  font-family: 'Material Symbols Outlined';
  font-size: 20px;
  font-weight: 400;
  font-variation-settings: 'FILL' 1;
  color: var(--ix-ok);
}
@media (max-width: 768px) {
  .block-match { --match-gap: 10px; padding: 14px; margin: 16px 0; }
  .block-match-item { min-height: 48px; padding: 10px 11px; font-size: 0.875rem; }
}
@media (prefers-reduced-motion: reduce) {
  .block-match-item { transition: none; }
  .block-match-item.is-selected { transform: none; }
  .block-match-item.is-wrong,
  .block-match.is-done,
  .block-match-item.is-matched,
  .block-match-item.is-matched[data-side="l"]::after { animation: none; }
}

/* ── Clasifica ────────────────────────────────────────────────
   Un mazo y unas cajas de colores. La tarjeta de encima se manda a su caja
   tocando la caja o arrastrándola (interactiveBlocks.js). Detrás se asoman
   las dos siguientes para que se sienta un mazo, no una lista. Al acertar,
   la tarjeta vuela a su caja y queda ahí como ficha; al terminar, las cajas
   son la clasificación.
   Colores de caja = los de "Unir parejas" (PAIR_COLORS); texto siempre en
   --text-primary sobre fondos del 12-20 % del color (skills: craft-floor). */
.block-sort {
  --match-shadow: 0 1px 2px rgba(24, 22, 38, 0.06), 0 6px 14px -8px rgba(24, 22, 38, 0.28);
  --match-shadow-up: 0 2px 4px rgba(24, 22, 38, 0.08), 0 14px 24px -10px rgba(24, 22, 38, 0.38);
  --ix-accent: var(--module-color, var(--violet, #6C2BFF));
  --ix-line: rgba(43, 43, 43, 0.14);
  --ix-ok: #16A34A;
  --ix-ok-ink: #15803D;
  --ix-no: #DC2626;
  --ix-no-bg: #FEF2F2;
  margin: 24px 0;
  padding: 20px;
  border: 1.5px solid var(--ix-accent);
  border-radius: 16px;
  background: var(--module-color-medium, rgba(108, 43, 255, 0.15));
  transition: border-color 240ms ease;
}
[data-theme="dark"] .block-sort {
  --match-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 6px 14px -8px rgba(0, 0, 0, 0.7);
  --match-shadow-up: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 14px 24px -10px rgba(0, 0, 0, 0.8);
  --ix-line: rgba(232, 230, 240, 0.16);
  --ix-ok: #22C55E;
  --ix-ok-ink: #4ADE80;
  --ix-no: #F87171;
  --ix-no-bg: rgba(239, 68, 68, 0.12);
}
.block-sort-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin: 4px 0 18px;
}
/* Todas las tarjetas en la misma celda: el mazo mide lo que la más alta. */
.block-sort-deck {
  display: grid;
  width: min(100%, 360px);
  padding-bottom: 20px; /* lo que se asoman las de detrás */
}
.block-sort-card {
  grid-area: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 92px;
  padding: 18px 20px;
  border: 1px solid var(--ix-line);
  border-radius: 16px;
  background: var(--bg-white, #FFF);
  box-shadow: var(--match-shadow-up);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  cursor: grab;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  transform-origin: 50% 0;
  transform: translateY(calc(var(--depth, 0) * 10px)) scale(calc(1 - var(--depth, 0) * 0.05));
  transition: transform 260ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)),
              opacity 200ms ease, box-shadow 200ms ease;
}
.block-sort-card[data-depth="1"] { opacity: 0.85; box-shadow: var(--match-shadow); pointer-events: none; }
.block-sort-card[data-depth="2"] { opacity: 0.6; box-shadow: none; pointer-events: none; }
.block-sort-card:not([data-depth="0"]):not([data-depth="1"]):not([data-depth="2"]) {
  opacity: 0;
  pointer-events: none;
}
/* En la tarjeta la fórmula es todo el contenido: va grande. */
.block-sort-card .katex { font-size: 1.45em; }
.block-sort .block-sort-bin .block-sort-bin-items li .katex { font-size: 1.15em; }
.block-sort-card.is-dragging {
  cursor: grabbing;
  transition: none;
  box-shadow: 0 0 0 2px var(--ix-accent), var(--match-shadow-up);
}
.block-sort-card.is-sorted { display: none; }
.block-sort-card.is-wrong {
  border-color: var(--ix-no);
  background: var(--ix-no-bg);
  animation: match-nope 300ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-sort-count {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
}
.block-sort.is-done .block-sort-stage { display: none; }

.block-sort-bins {
  display: grid;
  grid-template-columns: repeat(var(--cats, 2), minmax(0, 1fr));
  gap: 10px;
}
.block-sort-bin[data-color="0"] { --pair: #7C3AED; --pair-ink: #6D28D9; }
.block-sort-bin[data-color="1"] { --pair: #0284C7; --pair-ink: #0369A1; }
.block-sort-bin[data-color="2"] { --pair: #D97706; --pair-ink: #B45309; }
.block-sort-bin[data-color="3"] { --pair: #DB2777; --pair-ink: #BE185D; }
.block-sort-bin {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1.5px solid var(--pair);
  border-radius: 14px;
  background: var(--bg-white, #FFF);
  background: color-mix(in srgb, var(--pair) 12%, var(--bg-white, #FFF));
  transition: transform 160ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)),
              background-color 160ms ease, box-shadow 160ms ease;
}
[data-theme="dark"] .block-sort-bin {
  background: color-mix(in srgb, var(--pair) 20%, var(--bg-white, #1C1C26));
}
.block-sort-bin.is-over {
  transform: scale(1.03);
  background: color-mix(in srgb, var(--pair) 24%, var(--bg-white, #FFF));
  box-shadow: 0 0 0 3px var(--pair);
}
.block-sort-bin.is-wrong {
  border-color: var(--ix-no);
  animation: match-nope 300ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-sort-drop {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 56px;
  padding: 10px 12px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--text-primary);
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.25;
  text-align: left;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform 140ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-sort-drop:active { transform: scale(0.97); }
.block-sort-drop:focus-visible {
  outline: 2px solid var(--pair);
  outline-offset: 2px;
}
.block-sort.is-done .block-sort-drop { cursor: default; }
.block-sort-bin-name { flex: 1; min-width: 0; overflow-wrap: break-word; }
/* Contador: blanco sobre el tono oscuro del color de la caja (≥4.5:1). */
.block-sort-bin-n {
  flex: none;
  display: grid;
  place-items: center;
  min-width: 26px;
  height: 26px;
  padding: 0 7px;
  border-radius: 999px;
  background: var(--pair-ink);
  color: #FFFFFF;
  font-size: 0.8125rem;
  font-weight: 800;
}
.block-sort-bin-n.is-bump { animation: combo-pop 380ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)); }
.block-sort .block-sort-bin .block-sort-bin-items {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0;
  padding: 0 8px;
  list-style: none;
}
/* Especificidad alta a propósito: .lesson-viewer ul/li (sangría, 16 px,
   margen) se colaban dentro de la caja. */
.block-sort .block-sort-bin .block-sort-bin-items:not(:empty) { padding-bottom: 8px; }
.block-sort .block-sort-bin .block-sort-bin-items li {
  margin: 0;
  padding: 7px 10px;
  border-radius: 9px;
  background: var(--bg-white, #FFF);
  color: var(--text-primary);
  font-size: 0.8125rem;
  line-height: 1.35;
  overflow-wrap: break-word;
  animation: ix-reveal 260ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-sort-feedback {
  margin: 14px 0 0;
  font-size: 0.875rem;
  color: var(--text-primary);
}
.block-sort.is-done {
  border-color: var(--ix-ok);
  animation: reto-settle 320ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-sort.is-done .block-sort-feedback {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--ix-ok-ink);
  font-weight: 700;
}
.block-sort.is-done .block-sort-feedback::before {
  content: 'check_circle';
  font-family: 'Material Symbols Outlined';
  font-size: 20px;
  font-weight: 400;
  font-variation-settings: 'FILL' 1;
  color: var(--ix-ok);
}
/* Versión estática (Studio y fuera de la lección). */
.block-sort--static { padding: 0; border: 0; background: none; }
.block-sort-static {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}
.block-sort-static-name { margin: 0 0 4px; font-weight: 700; color: var(--text-primary); }
.block-sort-static ul { margin: 0; padding-left: 20px; line-height: 1.5; }
@media (max-width: 768px) {
  .block-sort { padding: 14px; margin: 16px 0; }
  .block-sort-bins { gap: 8px; }
  .block-sort[data-cats="4"] .block-sort-bins { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  /* Tres cajas lado a lado dejan fichas de 80 px y las palabras se parten:
     en el celular cada caja va en su fila y las fichas fluyen como pastillas. */
  .block-sort[data-cats="3"] .block-sort-bins { grid-template-columns: minmax(0, 1fr); }
  .block-sort[data-cats="3"] .block-sort-drop { min-height: 48px; }
  .block-sort[data-cats="3"] .block-sort-bin .block-sort-bin-items { flex-direction: row; flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) {
  .block-sort-card, .block-sort-bin, .block-sort-drop { transition: none; }
  .block-sort-card.is-wrong, .block-sort-bin.is-wrong, .block-sort.is-done,
  .block-sort-bin-n.is-bump, .block-sort .block-sort-bin .block-sort-bin-items li { animation: none; }
}

/* ── Ordena ───────────────────────────────────────────────────
   Una línea de pasos numerada y una bandeja de piezas barajadas. Se toca la
   pieza que va en el siguiente paso; la correcta viaja a su lugar (FLIP en
   interactiveBlocks.js), su número se pinta del color del paso y la línea
   avanza. Al terminar, la línea es el procedimiento completo.
   Texto siempre en --text-primary; los colores (PAIR_COLORS, en el orden de
   los pasos) solo en el número, el borde y el fondo del 12-20 %. */
.block-order {
  --match-shadow: 0 1px 2px rgba(24, 22, 38, 0.06), 0 6px 14px -8px rgba(24, 22, 38, 0.28);
  --match-shadow-up: 0 2px 4px rgba(24, 22, 38, 0.08), 0 14px 24px -10px rgba(24, 22, 38, 0.38);
  --ix-accent: var(--module-color, var(--violet, #6C2BFF));
  --ix-line: rgba(43, 43, 43, 0.14);
  --ix-ok: #16A34A;
  --ix-ok-ink: #15803D;
  --ix-no: #DC2626;
  --ix-no-bg: #FEF2F2;
  margin: 24px 0;
  padding: 20px;
  border: 1.5px solid var(--ix-accent);
  border-radius: 16px;
  background: var(--module-color-medium, rgba(108, 43, 255, 0.15));
  transition: border-color 240ms ease;
}
[data-theme="dark"] .block-order {
  --match-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 6px 14px -8px rgba(0, 0, 0, 0.7);
  --match-shadow-up: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 14px 24px -10px rgba(0, 0, 0, 0.8);
  --ix-line: rgba(232, 230, 240, 0.16);
  --ix-ok: #22C55E;
  --ix-ok-ink: #4ADE80;
  --ix-no: #F87171;
  --ix-no-bg: rgba(239, 68, 68, 0.12);
}
.block-order-slot[data-color="0"] { --pair: #7C3AED; --pair-ink: #6D28D9; }
.block-order-slot[data-color="1"] { --pair: #0284C7; --pair-ink: #0369A1; }
.block-order-slot[data-color="2"] { --pair: #D97706; --pair-ink: #B45309; }
.block-order-slot[data-color="3"] { --pair: #DB2777; --pair-ink: #BE185D; }
.block-order-slot[data-color="4"] { --pair: #059669; --pair-ink: #047857; }
.block-order-slot[data-color="5"] { --pair: #EA580C; --pair-ink: #C2410C; }

/* La línea: cada paso es número + hueco; un trazo vertical une los números. */
.block-order .block-order-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}
.block-order .block-order-slot {
  position: relative;
  display: flex;
  align-items: stretch;
  gap: 10px;
  margin: 0;
  padding: 0;
}
/* Trazo entre números: se pinta del color del paso cuando queda lleno. */
.block-order .block-order-slot:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 32px;
  bottom: -8px;
  width: 2px;
  border-radius: 2px;
  background: var(--ix-line);
  transition: background-color 240ms ease;
}
.block-order .block-order-slot.is-filled:not(:last-child)::before {
  background: var(--pair);
}
.block-order-num {
  flex: none;
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  margin-top: 8px;
  border: 2px solid var(--ix-line);
  border-radius: 50%;
  background: var(--bg-white, #FFF);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 800;
  transition: background-color 200ms ease, border-color 200ms ease, color 200ms ease, box-shadow 200ms ease;
}
/* Siguiente paso: anillo del color de la materia. Blanco sobre los tonos
   oscuros de la paleta = 5.0 a 7.1:1. */
.block-order-slot.is-next .block-order-num {
  border-color: var(--ix-accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--ix-accent) 22%, transparent);
}
.block-order-slot.is-filled .block-order-num {
  border-color: var(--pair-ink);
  background: var(--pair-ink);
  color: #FFFFFF;
  animation: combo-pop 380ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-order-fill {
  flex: 1;
  min-width: 0;
  display: flex;
  min-height: 48px;
  border: 1.5px dashed var(--ix-line);
  border-radius: 12px;
  transition: border-color 200ms ease;
}
.block-order-slot.is-next .block-order-fill { border-color: var(--ix-accent); }
.block-order-slot.is-filled .block-order-fill { border: 0; }

/* Bandeja: fichas como pastillas que fluyen. */
.block-order-pool {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.block-order.is-done .block-order-pool { display: none; }
.block-order-chip {
  display: flex;
  align-items: center;
  max-width: 100%;
  min-height: 48px;
  padding: 10px 14px;
  border: 1px solid var(--ix-line);
  border-radius: 12px;
  background: var(--bg-white, #FFF);
  box-shadow: var(--match-shadow);
  color: var(--text-primary);
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.35;
  text-align: left;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform 160ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)),
              box-shadow 200ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)),
              border-color 160ms ease, background-color 200ms ease;
}
.block-order-text { min-width: 0; overflow-wrap: break-word; }
.block-order-chip .katex { font-size: 1.2em; }
.block-order-chip:active:not(:disabled) { transform: scale(0.97); }
@media (hover: hover) and (pointer: fine) {
  .block-order-chip:hover:not(:disabled) {
    border-color: var(--ix-accent);
    box-shadow: var(--match-shadow-up);
  }
}
.block-order-chip:focus-visible {
  outline: 2px solid var(--ix-accent);
  outline-offset: 2px;
}
.block-order-chip.is-wrong {
  border-color: var(--ix-no);
  background: var(--ix-no-bg);
  animation: match-nope 300ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
/* Ya en su lugar: ocupa todo el hueco, se asienta y toma el color del paso. */
.block-order-chip.is-placed {
  flex: 1;
  width: 100%;
  border: 1.5px solid var(--pair);
  background: var(--ix-ok-bg, #F0FDF4);
  background: color-mix(in srgb, var(--pair) 12%, var(--bg-white, #FFF));
  box-shadow: none;
  cursor: default;
}
[data-theme="dark"] .block-order-chip.is-placed {
  background: color-mix(in srgb, var(--pair) 20%, var(--bg-white, #1C1C26));
}
.block-order-feedback {
  margin: 14px 0 0;
  font-size: 0.875rem;
  color: var(--text-primary);
}
.block-order.is-done {
  border-color: var(--ix-ok);
  animation: reto-settle 320ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-order.is-done .block-order-track { margin-bottom: 0; }
.block-order.is-done .block-order-feedback {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--ix-ok-ink);
  font-weight: 700;
}
.block-order.is-done .block-order-feedback::before {
  content: 'check_circle';
  font-family: 'Material Symbols Outlined';
  font-size: 20px;
  font-weight: 400;
  font-variation-settings: 'FILL' 1;
  color: var(--ix-ok);
}
.block-order--static { padding: 0; border: 0; background: none; }
.block-order-static { margin: 0; padding-left: 22px; line-height: 1.6; }
@media (max-width: 768px) {
  .block-order { padding: 14px; margin: 16px 0; }
  .block-order-chip { font-size: 0.875rem; }
}
@media (prefers-reduced-motion: reduce) {
  .block-order-chip, .block-order-num, .block-order-fill { transition: none; }
  .block-order-chip.is-wrong, .block-order.is-done,
  .block-order-slot.is-filled .block-order-num { animation: none; }
}

/* ── Mueve y mira ─────────────────────────────────────────────
   Una gráfica en vivo y 1 o 2 deslizadores. La meta va punteada; la curva
   del estudiante, gruesa y de color. Al coincidir, la curva se vuelve verde
   con un halo y sale confeti (interactiveBlocks.js). Deslizadores grandes
   para el pulgar (pulgar de 28 px, objetivo táctil ≥44 px de alto).
   Texto siempre en --text-primary; los colores van en trazos y pastillas. */
.block-mueve {
  --match-shadow: 0 1px 2px rgba(24, 22, 38, 0.06), 0 6px 14px -8px rgba(24, 22, 38, 0.28);
  --ix-accent: var(--module-color, var(--violet, #6C2BFF));
  --ix-line: rgba(43, 43, 43, 0.14);
  --ix-ok: #16A34A;
  --ix-ok-ink: #15803D;
  --curve: #7C3AED;
  --grid: rgba(43, 43, 43, 0.07);
  --axis: rgba(43, 43, 43, 0.35);
  --goal: rgba(43, 43, 43, 0.45);
  margin: 24px 0;
  padding: 20px;
  border: 1.5px solid var(--ix-accent);
  border-radius: 16px;
  background: var(--module-color-medium, rgba(108, 43, 255, 0.15));
  transition: border-color 240ms ease;
}
[data-theme="dark"] .block-mueve {
  --match-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 6px 14px -8px rgba(0, 0, 0, 0.7);
  --ix-line: rgba(232, 230, 240, 0.16);
  --ix-ok: #22C55E;
  --ix-ok-ink: #4ADE80;
  --curve: #A78BFA;
  --grid: rgba(232, 230, 240, 0.07);
  --axis: rgba(232, 230, 240, 0.35);
  --goal: rgba(232, 230, 240, 0.5);
}
.block-mueve--static { padding: 0; border: 0; background: none; }

.block-mueve .block-mueve-plot {
  /* En computador el SVG se estiraba a 850 px y los números de los ejes
     quedaban de 28 px: gráfica y controles con ancho de celular, centrados. */
  max-width: 520px;
  margin: 0 auto 14px;
  padding: 10px 10px 6px;
  border: 1px solid var(--ix-line);
  border-radius: 14px;
  background: var(--bg-white, #FFF);
  box-shadow: var(--match-shadow);
}
.block-mueve-plot svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.block-mueve-frame { fill: none; stroke: var(--ix-line); stroke-width: 1; }
.block-mueve-grid line { stroke: var(--grid); stroke-width: 1; }
.block-mueve-axes line { stroke: var(--axis); stroke-width: 1.25; }
.block-mueve-ticks text {
  fill: var(--text-primary);
  font-size: 9.5px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.block-mueve-ticks .block-mueve-axis-label { font-size: 10.5px; font-weight: 700; }
.block-mueve-goal {
  fill: none;
  stroke: var(--goal);
  stroke-width: 3;
  stroke-dasharray: 7 6;
  stroke-linecap: round;
}
.block-mueve-curve {
  fill: none;
  stroke: var(--curve);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 240ms ease, filter 240ms ease;
}
.block-mueve.is-match .block-mueve-curve {
  stroke: var(--ix-ok);
  filter: drop-shadow(0 0 5px color-mix(in srgb, var(--ix-ok) 55%, transparent));
}
.block-mueve-legend {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
}
.block-mueve-key { display: inline-flex; align-items: center; gap: 6px; }
.block-mueve-key::before {
  content: '';
  width: 18px;
  height: 0;
  border-top: 4px solid var(--curve);
  border-radius: 2px;
}
.block-mueve.is-match .block-mueve-key--curve::before { border-top-color: var(--ix-ok); }
.block-mueve-key--goal::before { border-top: 3px dashed var(--goal); }

/* Deslizadores */
.block-mueve-params { display: flex; flex-direction: column; gap: 12px; max-width: 520px; margin-inline: auto; }
.block-mueve-param {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 14px 6px;
  border: 1px solid var(--ix-line);
  border-radius: 14px;
  background: var(--bg-white, #FFF);
  cursor: pointer;
}
.block-mueve-param-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
}
/* Valor: blanco sobre #6D28D9 = 7.1:1; al dar en la meta, sobre #15803D = 5.0:1. */
.block-mueve-val {
  min-width: 48px;
  padding: 3px 10px;
  border-radius: 999px;
  background: #6D28D9;
  color: #FFFFFF;
  font-size: 0.875rem;
  font-weight: 800;
  text-align: center;
  font-variant-numeric: tabular-nums;
  transition: background-color 200ms ease;
}
.block-mueve-param.is-hit .block-mueve-val { background: #15803D; }
.block-mueve-range {
  --fill: 50%;
  width: 100%;
  height: 44px;
  margin: 0;
  background: transparent;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  touch-action: pan-y;
}
.block-mueve-range:focus-visible { outline: 2px solid var(--ix-accent); outline-offset: 2px; border-radius: 8px; }
.block-mueve-range::-webkit-slider-runnable-track {
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(to right, var(--curve) 0 var(--fill), var(--ix-line) var(--fill) 100%);
}
.block-mueve-range::-moz-range-track { height: 10px; border-radius: 999px; background: var(--ix-line); }
.block-mueve-range::-moz-range-progress { height: 10px; border-radius: 999px; background: var(--curve); }
.block-mueve-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 28px;
  height: 28px;
  margin-top: -9px;
  border: 3px solid var(--curve);
  border-radius: 50%;
  background: var(--bg-white, #FFF);
  box-shadow: 0 2px 6px rgba(24, 22, 38, 0.3);
  transition: transform 140ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-mueve-range::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border: 3px solid var(--curve);
  border-radius: 50%;
  background: var(--bg-white, #FFF);
  box-shadow: 0 2px 6px rgba(24, 22, 38, 0.3);
}
.block-mueve-range:active::-webkit-slider-thumb { transform: scale(1.12); }
.block-mueve-param.is-hit .block-mueve-range::-webkit-slider-thumb { border-color: var(--ix-ok); }
.block-mueve-param.is-hit .block-mueve-range::-webkit-slider-runnable-track {
  background: linear-gradient(to right, var(--ix-ok) 0 var(--fill), var(--ix-line) var(--fill) 100%);
}

.block-mueve-feedback {
  max-width: 520px;
  margin: 14px auto 0;
  font-size: 0.875rem;
  color: var(--text-primary);
}
.block-mueve.is-done {
  border-color: var(--ix-ok);
}
.block-mueve.is-done .block-mueve-feedback {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--ix-ok-ink);
  font-weight: 700;
}
.block-mueve.is-done .block-mueve-feedback::before {
  content: 'check_circle';
  flex: none;
  font-family: 'Material Symbols Outlined';
  font-size: 20px;
  font-weight: 400;
  font-variation-settings: 'FILL' 1;
  color: var(--ix-ok);
}
@media (max-width: 768px) {
  .block-mueve { padding: 14px; margin: 16px 0; }
  .block-mueve .block-mueve-plot { padding: 8px 6px 4px; }
  /* El SVG se encoge a ~350 px: los números suben para quedar en ~12 px. */
  .block-mueve-ticks text { font-size: 11px; }
  .block-mueve-ticks .block-mueve-axis-label { font-size: 11.5px; }
}
@media (prefers-reduced-motion: reduce) {
  .block-mueve-curve, .block-mueve-val { transition: none; }
}

/* ── Saltar (solo en la lección) ─────────────────────────────────
   Discreto para no invitar a saltarlo todo, pero siempre a mano: un juego
   no es un muro. Texto primario (no --text-secondary, que no pasa AA) y
   blanco de toque de 44 px. Desaparece cuando el juego se resuelve. */
.block-skip {
  display: flex;
  align-items: center;
  gap: 2px;
  min-height: 44px;
  margin: 6px 0 -10px auto;
  padding: 0 4px 0 12px;
  border: 0;
  border-radius: 10px;
  background: none;
  color: var(--text-primary);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 700;
  opacity: 0.72;
  cursor: pointer;
  transition: opacity 160ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1)), transform 140ms var(--ease-out, cubic-bezier(0.23, 1, 0.32, 1));
}
.block-skip .material-symbols-outlined { font-size: 20px; }
.block-skip:active { transform: scale(0.97); }
.block-skip:focus-visible { outline: 2px solid var(--ix-accent, #7C3AED); outline-offset: 2px; opacity: 1; }
@media (hover: hover) and (pointer: fine) {
  .block-skip:hover { opacity: 1; }
}
.is-answered > .block-skip,
.is-done > .block-skip { display: none; }

/* ── Traducciones (glosas) ──────────────────────────────────────
   `{{inglés|español}}` en las lecciones de Inglés (shared/blockCore.mjs).
   La frase lleva un subrayado punteado: se lee como "aquí hay ayuda" sin
   competir con la negrita ni con los enlaces. El popover lo maneja
   js/utils/glossPopover.js; en Studio la frase trae `title` (tooltip nativo).
   ──────────────────────────────────────────────────────────── */
.gloss {
  --gloss-line: color-mix(in srgb, var(--violet, #6C2BFF) 65%, transparent);
  text-decoration-line: underline;
  text-decoration-style: dotted;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.24em;
  text-decoration-color: var(--gloss-line);
  text-decoration-skip-ink: auto;
  border-radius: 4px;
  cursor: help;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 160ms ease, text-decoration-color 160ms ease;
}
[data-theme="dark"] .gloss { --gloss-line: color-mix(in srgb, #9D86FF 80%, transparent); }
.gloss.is-active {
  background-color: var(--violet-light, rgba(108, 43, 255, 0.1));
  text-decoration-style: solid;
  text-decoration-color: var(--violet, #6C2BFF);
}
[data-theme="dark"] .gloss.is-active { text-decoration-color: #9D86FF; }
.gloss:focus-visible {
  outline: 2px solid var(--violet, #6C2BFF);
  outline-offset: 2px;
}
@media (hover: hover) and (pointer: fine) {
  .gloss:not([data-gloss-locked]):hover,
  :is(.is-answered, .is-done, .is-sorted, .is-matched, .is-placed, .is-filled, .block-sort-bin-items) .gloss[data-gloss-locked]:hover {
    background-color: var(--violet-light, rgba(108, 43, 255, 0.1));
  }
}
/* Dentro de un juego sin responder no se insinúa nada: ni línea ni cursor. */
.gloss[data-gloss-locked] {
  text-decoration-line: none;
  cursor: inherit;
}
:is(.is-answered, .is-done, .is-sorted, .is-matched, .is-placed, .is-filled, .block-sort-bin-items) .gloss[data-gloss-locked] {
  text-decoration-line: underline;
  cursor: help;
}

.gloss-pop {
  --gloss-arrow-x: 50%;
  --gloss-ease: var(--ease-out-strong, cubic-bezier(0.23, 1, 0.32, 1));
  position: fixed;
  z-index: 9000;
  max-width: min(300px, calc(100vw - 32px));
  padding: 9px 13px 10px;
  border-radius: 10px;
  background: #1F1B2E;
  color: #FFFFFF;
  font-family: var(--font-family, 'Public Sans', system-ui, sans-serif);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.45;
  text-wrap: pretty;
  box-shadow: 0 10px 28px -8px rgba(20, 14, 48, 0.42), 0 2px 6px rgba(20, 14, 48, 0.16);
  pointer-events: none;
  opacity: 0;
  transform: translateY(3px) scale(0.96);
  transform-origin: var(--gloss-arrow-x) 100%;
  /* Salida más rápida que la entrada: el sistema responde, no decide. */
  transition: opacity 100ms ease-out, transform 100ms ease-out;
}
.gloss-pop[data-side="bottom"] {
  transform: translateY(-3px) scale(0.96);
  transform-origin: var(--gloss-arrow-x) 0;
}
.gloss-pop.is-open {
  opacity: 1;
  transform: none;
  transition: opacity 150ms var(--gloss-ease), transform 150ms var(--gloss-ease);
}
/* Si ya había una abierta (o se acaba de cerrar), la siguiente sale sin animar:
   recorrer una oración frase por frase se siente inmediato. */
.gloss-pop[data-instant] { transition-duration: 0ms; }
.gloss-pop::after {
  content: "";
  position: absolute;
  left: var(--gloss-arrow-x);
  bottom: -5px;
  width: 10px;
  height: 10px;
  margin-left: -5px;
  background: inherit;
  border-radius: 0 0 2px 0;
  transform: rotate(45deg);
}
.gloss-pop[data-side="bottom"]::after {
  top: -5px;
  bottom: auto;
  border-radius: 2px 0 0 0;
}
[data-theme="dark"] .gloss-pop {
  background: #F3F1FA;
  color: #1A1726;
  box-shadow: 0 10px 28px -8px rgba(0, 0, 0, 0.6), 0 2px 6px rgba(0, 0, 0, 0.35);
}
@media (prefers-reduced-motion: reduce) {
  .gloss-pop,
  .gloss-pop[data-side="bottom"],
  .gloss-pop.is-open { transform: none; }
}