/**
 * valor-absoluto.css — Estilos del Laboratorio de Valor Absoluto y Funciones por Partes.
 * Unificado con la arquitectura visual de sucesiones.css:
 * Pizarrón escolar interactivo, tableros cartesianos arrastrables, llaves vectoriales
 * escalables (.va-piecewise), fórmulas anotadas (.af-token) y soporte de impresión.
 */

/* ---------- Layout Principal: Sidebar + Contenido ---------- */
.seq-layout {
  display: grid;
  grid-template-columns: minmax(220px, 260px) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  width: 100%;
  max-width: 1360px;
  margin: 1.5rem auto 0;
  padding: 0 18px 48px;
  box-sizing: border-box;
}

@media (max-width: 900px) {
  .seq-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    margin: 1rem 0 0;
    padding: 0 12px 32px;
  }
}

/* ---------- Sidebar Sticky (Unificado con Sucesiones) ---------- */
.seq-sidebar {
  position: sticky;
  top: 4.5rem;
  max-height: calc(100vh - 5.5rem);
  overflow-y: auto;
  padding: 0 var(--s-4, 16px) 0 0;
  background-color: transparent;
  border: none;
  border-right: 1px dashed var(--line, var(--border));
  box-sizing: border-box;
}

@media (max-width: 900px) {
  .seq-sidebar {
    position: static;
    max-height: none;
    border-right: none;
    border-bottom: 1px dashed var(--line, var(--border));
    padding: 0 0 var(--s-3, 12px) 0;
  }
}

.seq-sidebar__title {
  font-family: var(--font-hand);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--yellow);
}

.seq-sidebar__progress {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
  padding-bottom: 10px;
}

.seq-progress-bar,
.seq-sidebar__progress-bar {
  width: 100%;
  height: 6px;
  background-color: rgba(236, 232, 220, 0.12);
  border: none;
  border-radius: 3px;
  overflow: hidden;
}

.seq-progress-fill,
.seq-sidebar__progress-fill {
  height: 100%;
  width: 0%;
  background-color: var(--green);
  transition: width 0.3s ease;
}

.seq-sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.seq-sidebar__chapter,
.seq-sidebar__chapter-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 12px 0 4px;
  font-weight: 700;
}

.seq-sidebar__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.seq-sidebar__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 10px;
  min-height: 40px;
  box-sizing: border-box;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.96rem;
  line-height: 1.3;
  border-radius: 6px;
  transition: color 0.15s, background-color 0.15s;
}

.seq-sidebar__link:hover,
.seq-sidebar__link:focus-visible {
  color: var(--yellow);
  background-color: color-mix(in srgb, var(--ink) 6%, transparent);
}

.seq-sidebar__link.is-active {
  color: var(--yellow);
  font-weight: 700;
  background-color: color-mix(in srgb, var(--yellow) 12%, transparent);
}

.seq-sidebar__status {
  font-size: 0.9rem;
  color: var(--muted);
  min-width: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
}

.seq-sidebar__status.is-done {
  color: var(--green);
  font-weight: bold;
}

/* ---------- Contenido de Lección y Modo Pizarrón ---------- */
.seq-content {
  min-width: 0;
  max-width: 100%;
}

.seq-content.mode-blackboard .seq-chapter-banner {
  display: none !important;
}

.seq-content.mode-blackboard .seq-section:not(.is-active) {
  display: none !important;
}

.seq-content.mode-blackboard .seq-section.is-active {
  display: block;
  animation: chalkFadeIn 0.22s ease-out;
}

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

.seq-blackboard-toolbar,
.board-TopBar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 8px 0 12px;
  margin-bottom: 20px;
  background-color: transparent;
  border: none;
  border-bottom: 1px dashed var(--line, var(--border));
  border-radius: 0;
}

.seq-blackboard-toolbar__info {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-family: var(--font-hand);
  font-size: 1.2rem;
  color: var(--yellow);
}

.seq-blackboard-toolbar__badge,
.board-pill {
  font-size: 1.05rem;
  font-family: var(--font-hand);
  font-weight: 700;
  background-color: transparent;
  color: var(--yellow);
  padding: 2px 8px;
  border: 1px dashed rgba(230, 211, 138, 0.45);
  border-radius: 6px;
}

.seq-blackboard-toolbar__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.seq-chapter-banner {
  border-bottom: 2px solid var(--border-strong);
  padding-bottom: 10px;
  margin-top: 12px;
  margin-bottom: 16px;
}

.seq-chapter-banner__tag {
  font-family: var(--font-hand);
  font-size: 1.3rem;
  color: var(--yellow);
  display: block;
}

.seq-chapter-banner__title {
  font-family: var(--font-hand);
  font-size: 2.2rem;
  margin: 4px 0;
  color: var(--ink);
}

/* ---------- Secciones y Encabezados Apilados ---------- */
.seq-section {
  background-color: transparent;
  border: none;
  box-shadow: none;
  padding: 12px 0 32px;
  margin-bottom: 32px;
  position: relative;
  box-sizing: border-box;
  scroll-margin-top: 24px;
  max-width: 100%;
}

@media (max-width: 640px) {
  .seq-section {
    padding: 16px 4px 24px;
    margin-bottom: 24px;
  }
}

.seq-section__header,
.seq-sec-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  margin-bottom: 22px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border-strong);
}

.seq-section__tag,
.seq-section__num,
.seq-sec-num {
  font-size: 0.95rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-hand);
  font-weight: 700;
}

.seq-section__title {
  font-family: var(--font-hand);
  font-size: clamp(1.85rem, 4vw, 2.45rem);
  line-height: 1.25;
  margin: 2px 0 4px;
  color: var(--ink);
}

/* ---------- Los 5 Bloques Invariantes ---------- */
.seq-block {
  margin: 28px 0;
}

.seq-block__label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-hand);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--yellow);
  margin-bottom: 10px;
}

.seq-block--phrase .seq-phrase-text {
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--ink);
  font-style: italic;
  border-left: 3px solid var(--yellow);
  padding-left: 16px;
  margin: 0;
}

.seq-block--caution {
  background-color: transparent;
  border: none;
  padding: 8px 0;
  margin: 24px 0;
  transform: rotate(-0.6deg);
}

.seq-block--caution .seq-block__label {
  color: var(--pink);
}

/* Bandeja de Tizas Escolar Inferior */
.seq-chalk-tray {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
  position: relative;
}

.seq-chalk-tray__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-hand);
  font-size: 1.15rem;
}

.seq-chalk-tray__info {
  font-family: var(--font-hand);
  font-size: 1.05rem;
  color: var(--muted);
  text-align: center;
  flex: 1;
}

/* ---------- Tableros Cartesianos y Recta 1D ---------- */
.abs-board-wrap,
.abs-check-board-wrap {
  width: 100%;
  max-width: 600px;
  margin: 12px auto;
  box-sizing: border-box;
}

.abs-board-svg,
.abs-1d-svg {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  touch-action: none;
  user-select: none;
  border: 1px dashed var(--border-strong);
  border-radius: 8px;
  background: color-mix(in srgb, var(--bg) 92%, #000000);
}

.abs-board__handle {
  cursor: grab;
  outline: none;
}

.abs-board__handle:active {
  cursor: grabbing;
}

.abs-board__handle:hover circle,
.abs-board__handle:focus-visible circle {
  stroke: var(--yellow);
  stroke-width: 3.5px;
  filter: drop-shadow(0 0 6px var(--yellow));
}

/* ---------- Controles Estabilizados de Radiografía (Widget 7) ---------- */
.abs-radio-controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  align-items: stretch;
  margin: 12px 0 16px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.12));
  border-radius: var(--radius-md, 8px);
  box-sizing: border-box;
}

@media (max-width: 768px) {
  .abs-radio-controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
}

@media (max-width: 480px) {
  .abs-radio-controls {
    grid-template-columns: 1fr;
  }
}

.abs-radio-control-item {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 56px;
  gap: 6px;
}

.abs-radio-control-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 6px;
  font-size: 0.9rem;
}

.abs-radio-control-label {
  color: var(--text-muted, var(--muted));
  font-family: var(--font-hand);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.abs-radio-control-head .eq {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  min-width: 38px;
  text-align: right;
  flex-shrink: 0;
}

.abs-radio-control-item input[type="range"] {
  width: 100%;
  margin: 0;
  cursor: pointer;
}

/* ---------- Fórmula Anotada con Tokens Interactivos (.af-token / .abs-token) ---------- */
.abs-annotated,
.seq-annotated {
  margin: 16px 0;
  padding: 8px 0;
}

.abs-annotated__formula,
.seq-annotated__formula {
  font-family: var(--font-hand);
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.af-token,
.abs-token {
  background: transparent;
  border: 1px dashed var(--yellow);
  border-radius: var(--radius, 6px);
  font: inherit;
  padding: 6px 12px;
  min-height: 46px;
  min-width: 46px;
  box-sizing: border-box;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.15s, border-color 0.15s;
}

.af-token--pink {
  color: var(--pink);
  border-color: var(--pink);
}

.af-token--teal {
  color: var(--teal, var(--blue));
  border-color: var(--teal, var(--blue));
}

.af-token--yellow {
  color: var(--yellow);
  border-color: var(--yellow);
}

.abs-token__main,
.af-token__main {
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.1;
  display: inline-flex;
  align-items: center;
  gap: 2px;
}

.abs-token__sub,
.af-token__sub {
  font-size: 0.76rem;
  color: var(--muted);
  font-family: var(--font-sans, sans-serif);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.af-token:hover,
.af-token:focus-visible,
.af-token.is-active,
.abs-token:hover,
.abs-token:focus-visible,
.abs-token.is-active {
  background-color: color-mix(in srgb, var(--yellow) 18%, transparent);
  transform: translateY(-2px);
  outline: none;
}

.seq-annotated__note-box {
  min-height: 82px;
  display: flex;
  align-items: flex-start;
  padding: 6px 0;
  box-sizing: border-box;
}

.seq-annotated__hint-text {
  margin: 0;
  padding: 6px 12px;
  line-height: 1.45;
  box-sizing: border-box;
}

@keyframes note-fade-in {
  from {
    opacity: 0;
    transform: translateY(-2px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.annotated-Callout,
.seq-annotated__note {
  margin: 0;
  font-family: var(--font-hand);
  font-size: 1.25rem;
  color: var(--yellow);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-left: 3px solid var(--yellow);
  background: color-mix(in srgb, var(--yellow) 8%, transparent);
  border-radius: 0 6px 6px 0;
  transform: rotate(-0.5deg);
  animation: note-fade-in 0.16s ease-out;
}

@media (max-width: 600px) {
  .seq-annotated__note-box {
    min-height: 96px;
  }
}

/* ---------- Llave de Función por Partes (.va-piecewise) ---------- */
.va-piecewise,
.abs-brace-box {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3, 12px);
  padding: var(--s-3, 12px) var(--s-4, 16px);
  border: 1px dashed var(--line, var(--border-strong));
  border-radius: var(--radius, 8px);
  font-family: var(--font-hand);
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  max-width: 100%;
  overflow-x: auto;
  box-sizing: border-box;
  margin: 12px 0;
}

.va-pw-lhs,
.abs-brace__lhs {
  white-space: nowrap;
  font-weight: 700;
  color: var(--ink);
  flex-shrink: 0;
}

.va-pw-brace {
  align-self: stretch;
  width: 22px;
  flex-shrink: 0;
  display: flex;
  align-items: stretch;
}

.va-pw-brace-svg {
  width: 100%;
  height: 100%;
  min-height: 3.2rem;
  display: block;
}

.va-pw-rows,
.abs-brace__rows {
  display: grid;
  grid-template-columns: minmax(7rem, auto) 1fr;
  gap: var(--s-2, 8px) var(--s-4, 16px);
  align-items: baseline;
  min-width: 0;
}

.va-pw-row,
.abs-brace__row {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(7rem, auto) 1fr;
  gap: var(--s-2, 8px) var(--s-4, 16px);
  align-items: baseline;
  padding: 5px 10px;
  border-radius: 6px;
  transition: background-color 0.2s, color 0.2s, opacity 0.2s;
}

.va-pw-expr,
.abs-brace__expr {
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.va-pw-cond,
.abs-brace__cond {
  font-size: 1.15rem;
  color: var(--teal, var(--blue));
  white-space: nowrap;
}

.va-pw-row.is-active,
.abs-brace__row.is-active {
  background-color: color-mix(in srgb, var(--yellow) 20%, transparent);
  border-left: 3px solid var(--yellow);
}

.va-pw-row.is-active .va-pw-expr,
.va-pw-row.is-active .va-pw-cond,
.abs-brace__row.is-active .abs-brace__expr,
.abs-brace__row.is-active .abs-brace__cond {
  color: var(--yellow);
  font-weight: 700;
}

.va-pw-row.is-rejected,
.abs-brace__row.is-rejected {
  opacity: 0.45;
  text-decoration: line-through;
  color: var(--pink);
}

/* ---------- Lecturas y notas pedagógicas (escritura directa en pizarrón) ---------- */
.va-readout {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 4px 2px;
  margin: 10px 0;
  font-family: var(--font-hand);
  font-size: 1.18rem;
  line-height: 1.6;
  color: var(--ink);
  transform: rotate(-0.35deg);
}

.va-readout:nth-of-type(even) {
  transform: rotate(0.28deg);
}

.va-readout p {
  margin: 0 0 6px 0;
}

.va-readout p:last-child {
  margin-bottom: 0;
}

.va-readout .eq {
  font-size: 1.24rem;
}

.va-chalk-callout {
  margin-top: 10px;
  padding-left: 14px;
  border-left: 2px solid var(--teal);
  background: transparent;
  border-radius: 0;
  font-family: var(--font-hand);
}

/* ---------- Máquina Inversora Pedagógica (Sin cajas artificiales) ---------- */
.va-machine-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
  font-family: var(--font-hand);
}

.va-machine-title {
  color: var(--yellow);
  font-size: 1.35rem;
  letter-spacing: 0.3px;
}

.va-machine-subtitle {
  font-size: 1.05rem;
  color: var(--muted);
}

.va-sign-machine {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 16px;
  padding: 8px 0;
  margin: 10px 0;
  background: transparent;
  border: none;
  border-radius: 0;
  font-family: var(--font-hand);
}

.va-sign-step,
.va-sign-machine__box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 16px;
  min-width: 140px;
  text-align: center;
  background: transparent;
  border: none;
  border-radius: 0;
  position: relative;
  transition: transform 0.15s ease-out;
}

.va-sign-step--active {
  transform: scale(1.05) rotate(-0.5deg);
}

.va-sign-step--active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 10%;
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--yellow), transparent);
  border-radius: 1px;
}

.va-sign-step__label {
  font-size: 1.08rem;
  color: var(--ink);
}

.va-sign-step__val {
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.15;
}

.va-sign-arrow,
.va-sign-machine__arrow {
  display: inline-flex;
  align-items: center;
  font-size: 1.8rem;
  color: var(--yellow);
  font-weight: 700;
  opacity: 0.85;
  user-select: none;
}

.va-comparator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin: 14px 0;
  font-family: var(--font-hand);
}

.va-comparator-col,
.va-comparator-card {
  padding: 6px 14px;
  border: none;
  border-left: 2px solid var(--border);
  border-radius: 0;
  background: transparent;
}

.va-customs-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 12px 0;
}

.va-customs-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 6px 4px;
  border: none;
  border-bottom: 1px dashed var(--border);
  border-radius: 0;
  background: transparent;
  font-family: var(--font-hand);
  font-size: 1.18rem;
}

.va-customs-card.is-winner,
.va-customs-card.is-true {
  color: var(--green);
  border-bottom-color: var(--green);
}

.va-customs-card.is-rejected,
.va-customs-card.is-false {
  opacity: 0.5;
  color: var(--muted);
  text-decoration: line-through;
}

/* ---------- Editor de Tramos ---------- */
.abs-editor-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 12px 0;
}

.abs-editor-row {
  padding: 6px 4px;
  border: none;
  border-bottom: 1px dashed var(--border);
  border-radius: 0;
  background: transparent;
  font-family: var(--font-hand);
  font-size: 1.15rem;
}

/* ---------- Botón de duda/clarificación previa al chequeo (.seq-doubt-btn) ---------- */
.seq-doubt-wrap {
  margin: 1.25rem 0 0.5rem;
  display: flex;
  align-items: center;
}

.seq-doubt-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: rgba(126, 200, 200, 0.08);
  border: 1px dashed var(--teal);
  border-radius: 6px;
  padding: 10px 16px;
  cursor: pointer;
  color: var(--teal);
  font-family: inherit;
  text-align: left;
  transition: background-color 0.15s, border-color 0.15s, transform 0.1s;
  box-sizing: border-box;
  max-width: 100%;
}

.seq-doubt-btn:hover {
  background: rgba(126, 200, 200, 0.16);
  border-color: var(--teal);
  transform: translateY(-1px);
}

.seq-doubt-btn:active {
  transform: translateY(0);
}

.seq-doubt-btn__icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  color: var(--teal);
}

.seq-doubt-btn__content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.seq-doubt-btn__title {
  font-family: var(--font-hand);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--yellow);
  line-height: 1.2;
}

.seq-doubt-btn__desc {
  font-size: 0.88rem;
  color: var(--ink);
  opacity: 0.88;
  line-height: 1.35;
}

/* ---------- Bloque de Chequeo (createCheckBlock) ---------- */
.seq-check-block {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin: 18px 0;
}

.seq-check__card {
  padding: 16px 4px;
  border: none;
  border-top: 1px dashed var(--border);
  border-radius: 0;
  background: transparent;
  box-sizing: border-box;
  max-width: 100%;
  transition: background-color 0.2s;
}

.seq-check__card:first-child {
  border-top: none;
}

.seq-check__card.is-resolved {
  background: color-mix(in srgb, var(--green) 3%, transparent);
}

.seq-check__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.seq-check__badge {
  font-size: 0.85rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.seq-check__check-icon {
  width: 1.2em;
  height: 1.2em;
  display: inline-block;
  color: var(--green);
}

.seq-check__prompt {
  font-size: 1.05rem;
  line-height: 1.5;
  margin-bottom: 12px;
}

.seq-check__row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.seq-check__input {
  min-width: 120px;
  flex: 1;
  max-width: 320px;
}

.seq-check__input-sm {
  width: 86px;
  min-width: 72px;
}

.seq-check__pair-grid {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.seq-check__pair-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.seq-check__options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}

.seq-check__opt-btn,
button[data-answer] {
  text-align: left;
  justify-content: flex-start;
  gap: 6px;
  padding: 8px 12px;
  font-size: 0.95rem;
  width: 100%;
  border: 0;
  border-image: none;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  align-items: baseline;
  box-sizing: border-box;
}

.seq-check__opt-tag {
  flex-shrink: 0;
  color: var(--yellow);
}

.seq-check__opt-btn:hover,
button[data-answer]:hover {
  border: 0;
  border-image: none;
  color: var(--yellow);
}

.seq-check__opt-btn.is-correct .seq-check__opt-tag {
  color: var(--green);
}

.seq-check__opt-btn.is-selected .seq-check__opt-tag {
  color: var(--yellow);
}

.seq-check__tools {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 10px;
}

.seq-check__hints-box {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.seq-check__hint-item {
  padding: 8px 12px;
  background-color: color-mix(in srgb, var(--yellow) 8%, transparent);
  border-left: 2px solid var(--yellow);
}

.seq-check__solution-box,
.seq-steps-box {
  margin-top: 12px;
  padding: 12px;
  background-color: color-mix(in srgb, var(--blue) 8%, transparent);
  border-left: 3px solid var(--blue);
}

.seq-check__all-done {
  margin-top: 12px;
}

/* Ocultamiento estricto de cajas auxiliares vacías */
.seq-check__solution-box:empty,
.seq-check__hints-box:empty,
.seq-check__feedback:empty,
.seq-check__tools:empty,
.seq-annotated__note-box:empty,
.seq-widget-feedback:empty {
  display: none !important;
}

/* ---------- Controles y Tablas ---------- */
.seq-controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin: 12px 0;
}

.seq-widget-inputs {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin: 12px 0;
}

.seq-widget-feedback {
  margin-top: 8px;
}

.seq-fn-grid {
  display: grid;
  grid-template-columns: minmax(220px, 320px) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  margin: 14px 0;
}

@media (max-width: 768px) {
  .seq-fn-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.seq-section .field__label {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  white-space: normal;
  max-width: 100%;
}

.seq-table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 12px 0;
}

.seq-table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
  font-family: var(--font-hand);
  font-size: 1.15rem;
}

.seq-table th,
.seq-table td {
  padding: 6px 10px;
  border: 1px solid var(--border-strong);
}

.seq-table tr.is-active {
  background-color: color-mix(in srgb, var(--yellow) 15%, transparent);
  color: var(--yellow);
  font-weight: bold;
}

.seq-summary-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.seq-summary-table th,
.seq-summary-table td {
  padding: 10px 14px;
  border: 1px solid var(--border-strong);
  vertical-align: top;
}

.seq-summary-table th {
  background-color: color-mix(in srgb, var(--ink) 8%, transparent);
  color: var(--yellow);
  font-family: var(--font-hand);
  font-size: 1.3rem;
}

/* Protección contra desborde horizontal en móviles pequeños (320px - 375px) */
@media (max-width: 640px) {
  .seq-layout {
    padding: 0 8px 32px;
  }

  .seq-controls > *,
  .seq-widget-inputs > * {
    min-width: 0 !important;
    max-width: 100%;
  }

  .seq-check__options {
    grid-template-columns: minmax(0, 1fr);
  }

  .va-piecewise,
  .abs-brace-box {
    font-size: 1.1rem;
    padding: 8px 10px;
  }

  .va-pw-rows,
  .va-pw-row {
    grid-template-columns: minmax(5.5rem, auto) 1fr;
    gap: 6px 10px;
  }

  .abs-annotated__formula {
    font-size: 1.3rem;
  }
}

/* ---------- Hoja de Repaso Imprimible ---------- */
@media print {
  body {
    background: #ffffff !important;
    color: #111111 !important;
  }

  body::before {
    display: none !important;
  }

  .site-nav,
  .seq-sidebar,
  .seq-blackboard-toolbar,
  .seq-chalk-tray,
  .seq-controls,
  .btn,
  .btn-print,
  .chip,
  .seq-check,
  .seq-check__tools,
  .seq-check__feedback,
  .seq-check__hints,
  .seq-widget-inputs,
  .seq-retos__header,
  .seq-retos__tabs,
  .vn-trigger,
  .vn-trigger-row {
    display: none !important;
  }

  .seq-layout {
    display: block !important;
    max-width: 100% !important;
    padding: 0 !important;
  }

  .seq-content {
    max-width: 100% !important;
    padding: 0 !important;
  }

  .seq-content.mode-blackboard .seq-section,
  .seq-section {
    display: block !important;
    page-break-inside: avoid;
    border: none !important;
    border-bottom: 1px solid #cccccc !important;
    box-shadow: none !important;
    padding: 16px 0 !important;
  }

  .seq-summary-table {
    page-break-inside: avoid;
    width: 100% !important;
  }

  .seq-summary-table th,
  .seq-summary-table td {
    border: 1px solid #333333 !important;
    color: #000000 !important;
    background: transparent !important;
  }

  .seq-summary-table th {
    background-color: #f0f0f0 !important;
    color: #111111 !important;
  }

  code {
    background: #f4f4f4 !important;
    color: #111111 !important;
    border: 1px solid #dddddd !important;
  }
}