/* METAMI locale-driven workbook surface — approved Thai font roles and safe metrics. */
:root {
  --workbook-body: "IBM Plex Sans Thai Looped", "Noto Sans Thai", Tahoma, sans-serif;
  --workbook-display: Mitr, "IBM Plex Sans Thai Looped", "Noto Sans Thai", sans-serif;
  --workbook-ink: var(--text-primary, #25332f);
  --workbook-muted: var(--text-secondary, #61706a);
  --workbook-surface: var(--surface, #fffdfa);
  --workbook-border: color-mix(in srgb, var(--workbook-ink) 15%, transparent);
  --workbook-teal: var(--brand, #167f74);
  --workbook-coral: var(--accent-coral, #d86457);
  --workbook-amber: var(--accent-yellow, #b97810);
}

html {
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-text-size-adjust: 100%;
}

body,
button,
input,
select,
textarea {
  font-family: var(--workbook-body);
}

body {
  line-height: 1.68;
  overflow-wrap: break-word;
}

.page-view-card,
.learner-activity,
.workbook-intro,
.family-summary,
.question-card,
.passage-container,
.instruction-box,
.answer-feedback-box,
.workbook-toolbar,
.bottom-action-row {
  min-block-size: 0;
  overflow: visible;
}

.page-title,
.family-summary h2,
.workbook-intro h1 {
  margin-block: 0.15em 0.55em;
  font-family: var(--workbook-display);
  font-weight: 600;
  line-height: 1.42;
  overflow: visible;
}

.family-badge,
.page-num-pill,
.q-badge,
.workbook-toolbar label {
  font-family: var(--workbook-display);
  font-weight: 500;
  line-height: 1.48;
  overflow: visible;
}

.passage-body,
.q-prompt-text,
.instruction-box,
.answer-hint,
.answer-feedback-box,
.summary-section,
.audio-assistive-note {
  font-family: var(--workbook-body);
  font-weight: 400;
  line-height: 1.78;
}

.workbook-toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem 0.8rem;
  margin: 0 0 1.25rem;
  padding: 0.75rem;
  border: 1px solid var(--workbook-border);
  border-radius: 1rem;
  background: color-mix(in srgb, var(--workbook-surface) 92%, var(--workbook-teal) 8%);
}

.workbook-locale-select,
.workbook-print-link,
.tts-btn,
.audio-restart-btn,
.btn-skip,
.btn-summary-secondary,
.question-support-actions button,
.choice-btn,
.btn-check-answer,
.btn-bottom-next,
.research-boundary button {
  min-height: 44px;
  border-radius: 0.8rem;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
}

.workbook-locale-select {
  min-width: 8.5rem;
  padding: 0.55rem 2.25rem 0.55rem 0.75rem;
  border: 1px solid var(--workbook-border);
  background: var(--workbook-surface);
  color: var(--workbook-ink);
}

.workbook-print-link {
  display: inline-flex;
  align-items: center;
  margin-inline-start: auto;
  padding: 0.45rem 0.85rem;
  color: var(--workbook-teal);
  text-decoration: none;
}

.workbook-intro,
.learner-activity,
.family-summary {
  max-width: 54rem;
  margin-inline: auto;
}

.workbook-lede {
  max-width: 44rem;
  color: var(--workbook-muted);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  line-height: 1.75;
}

.audio-control {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-block: 1rem;
  padding: 0.85rem;
  border-radius: 1rem;
  background: color-mix(in srgb, var(--workbook-surface) 90%, var(--workbook-teal) 10%);
}

.tts-btn,
.audio-restart-btn {
  border: 1px solid color-mix(in srgb, var(--workbook-teal) 55%, transparent);
  padding: 0.55rem 0.95rem;
  background: var(--workbook-surface);
  color: var(--workbook-teal);
}

.audio-assistive-note {
  flex-basis: 100%;
  color: var(--workbook-muted);
  font-size: 0.92rem;
}

.questions-list {
  display: grid;
  gap: 1rem;
}

.question-card {
  padding: clamp(1rem, 3vw, 1.4rem);
  border: 1px solid var(--workbook-border);
  border-radius: 1.15rem;
  background: var(--workbook-surface);
}

.question-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.q-badge {
  display: inline-grid;
  flex: 0 0 2rem;
  min-height: 2rem;
  place-items: center;
  border-radius: 999px;
  background: color-mix(in srgb, var(--workbook-teal) 15%, transparent);
  color: var(--workbook-teal);
}

.q-prompt-text {
  margin: 0;
  font-size: clamp(1.04rem, 2.5vw, 1.2rem);
}

.input-interactive-row,
.choice-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-block: 1rem;
}

.child-text-input {
  flex: 1 1 13rem;
  min-height: 48px;
  padding: 0.65rem 0.8rem;
  border: 2px solid var(--workbook-border);
  border-radius: 0.8rem;
  background: var(--workbook-surface);
  color: var(--workbook-ink);
  font-size: 1.08rem;
}

.btn-check-answer,
.choice-btn {
  border: 1px solid color-mix(in srgb, var(--workbook-teal) 45%, transparent);
  padding: 0.55rem 1rem;
  background: var(--workbook-surface);
  color: var(--workbook-ink);
}

.choice-btn.is-selected,
.choice-btn:focus-visible,
.btn-check-answer:focus-visible {
  border-color: var(--workbook-teal);
  outline: 3px solid color-mix(in srgb, var(--workbook-teal) 30%, transparent);
  outline-offset: 2px;
}

.answer-feedback-box,
.answer-hint {
  margin-block: 0.8rem;
  padding: 0.8rem 1rem;
  border-radius: 0.85rem;
}

.feedback-success {
  background: color-mix(in srgb, #4a9b79 14%, var(--workbook-surface));
  color: color-mix(in srgb, #17694c 88%, var(--workbook-ink));
}

.feedback-support,
.answer-hint {
  background: color-mix(in srgb, #e4ad45 18%, var(--workbook-surface));
  color: var(--workbook-ink);
}

.question-support-actions button,
.btn-skip {
  border: 0;
  padding: 0.5rem 0.85rem;
  background: transparent;
  color: var(--workbook-muted);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.activity-support-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.75rem;
}

.bottom-action-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 1.1rem;
  padding-block: 0.7rem max(0.7rem, env(safe-area-inset-bottom));
}

.btn-bottom-next {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: min(100%, 12rem);
  border: 0;
  padding: 0.75rem 1.15rem;
  background: var(--workbook-teal);
  color: #fff;
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(20, 100, 91, 0.18);
}

.math-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.8rem;
  min-height: 8rem;
  margin-block: 1.1rem;
  padding: 1rem;
  border-radius: 1.2rem;
  background: color-mix(in srgb, var(--workbook-surface) 88%, #e4ad45 12%);
}

.math-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem;
  max-width: 14rem;
}

.math-object {
  display: inline-grid;
  width: 2.15rem;
  height: 2.15rem;
  place-items: center;
  border-radius: 0.55rem;
  background: var(--workbook-teal);
  color: transparent;
}

.math-object.is-crossed {
  opacity: 0.3;
  text-decoration: line-through;
}

.math-symbol,
.math-zero {
  font-family: var(--workbook-display);
  font-size: 2rem;
  font-weight: 600;
}

.summary-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
  margin-block: 1.1rem 1.5rem;
}

.summary-stat-grid > div {
  display: grid;
  gap: 0.2rem;
  padding: 0.9rem;
  border: 1px solid var(--workbook-border);
  border-radius: 1rem;
  background: var(--workbook-surface);
}

.summary-stat-grid strong {
  font-family: var(--workbook-display);
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--workbook-teal);
}

.summary-stat-grid span {
  color: var(--workbook-muted);
  line-height: 1.55;
}

.summary-section {
  margin-block: 1rem;
  padding: 1rem;
  border-radius: 1rem;
  background: color-mix(in srgb, var(--workbook-surface) 94%, var(--workbook-teal) 6%);
}

.summary-section h2 {
  font-size: 1.18rem;
}

.summary-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-block: 1.4rem;
}

.btn-summary-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 0.95rem;
  border: 1px solid var(--workbook-border);
  color: var(--workbook-ink);
  text-decoration: none;
}

.research-details {
  margin-top: 1.5rem;
  border-top: 1px solid var(--workbook-border);
  padding-top: 1rem;
  color: var(--workbook-muted);
}

.research-details summary {
  min-height: 44px;
  cursor: pointer;
  font-weight: 600;
}

.research-boundary {
  padding: 0.9rem;
  border-radius: 0.8rem;
  background: color-mix(in srgb, var(--workbook-surface) 92%, var(--workbook-muted) 8%);
}

.sequence-interactive-wrap {
  display: grid;
  gap: 0.7rem;
}

.seq-item-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.7rem;
  min-height: 52px;
  padding: 0.7rem;
  border: 1px solid var(--workbook-border);
  border-radius: 0.85rem;
}

.btn-move {
  width: 44px;
  height: 44px;
  border: 1px solid var(--workbook-border);
  border-radius: 0.7rem;
  background: var(--workbook-surface);
  color: var(--workbook-ink);
}

@media (max-width: 620px) {
  .main-container {
    padding-inline: 0.75rem;
  }

  .progress-bar-container {
    position: relative;
  }

  .summary-stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workbook-print-link {
    margin-inline-start: 0;
  }

  .bottom-action-row {
    position: sticky;
    z-index: 8;
    bottom: 0;
    margin-inline: -0.5rem;
    padding-inline: 0.5rem;
    background: linear-gradient(to bottom, transparent, var(--workbook-surface) 28%);
  }

  .btn-bottom-next {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

@media print {
  .app-header,
  .progress-bar-container,
  .workbook-toolbar,
  .audio-control,
  .activity-support-row,
  .bottom-action-row,
  .research-details {
    display: none !important;
  }

  body {
    background: #fff !important;
    color: #111 !important;
    font-size: 12.5pt;
  }

  .page-view-card,
  .question-card,
  .summary-section {
    box-shadow: none !important;
    background: #fff !important;
    break-inside: avoid;
  }
}