/* Chapter-scoped styles keep the rest of the reading edition unchanged. */
#precision-chapter {
  --precision-ink: #21372f;
  --precision-teal: #0c665c;
  --precision-sage: #e4ede8;
  --precision-blue: #193cb8;
  --precision-yellow: #ead678;
  color: var(--precision-ink);
}
#precision-chapter .precision-chapter-title {
  font-size: clamp(36px, 7vw, 56px);
  line-height: 1.2;
  margin-block: 56px 26px;
  letter-spacing: -1px;
}
#precision-chapter > p:first-of-type { font-size: 22px; line-height: 1.7; }
#precision-chapter .precision-experience {
  margin: 40px -36px;
  padding: 30px 32px;
  border: 1px solid #b9ccc3;
  border-radius: 8px;
  background: #fff;
  line-height: 1.65;
  font-size: 17px;
  scroll-margin-top: 100px;
}
#precision-chapter .precision-intro { margin-bottom: 24px; max-width: 65ch; }
#precision-chapter .precision-kind {
  font-size: 14px;
  font-weight: 700;
  color: var(--precision-teal);
  margin-bottom: 8px;
}
#precision-chapter .precision-intro h2 { margin: 0 0 12px; font-size: clamp(25px, 4vw, 31px); line-height: 1.3; }
#precision-chapter .precision-intro p { margin-bottom: 12px; }
#precision-chapter .precision-note { font-size: 14px; line-height: 1.65; color: #4b6057; }
#precision-chapter .precision-workbench { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.5fr); gap: 28px; }
#precision-chapter .precision-request { min-width: 0; }
#precision-chapter .precision-request h3,
#precision-chapter .precision-game h3,
#precision-chapter .precision-counter-rail h3,
#precision-chapter .precision-static h3 { color: var(--precision-ink); font-size: 18px; line-height: 1.4; margin: 0 0 16px; }
#precision-chapter button,
#precision-chapter textarea { font: inherit; }
#precision-chapter button {
  cursor: pointer;
  min-height: 44px;
  line-height: 1.4;
  border-radius: 5px;
  padding: 10px 14px;
  border: 1px solid transparent;
  touch-action: manipulation;
}
#precision-chapter button:focus-visible,
#precision-chapter textarea:focus-visible,
#precision-chapter summary:focus-visible,
#precision-chapter [tabindex="-1"]:focus-visible { outline: 3px solid var(--precision-blue); outline-offset: 4px; }
#precision-chapter button:disabled { cursor: default; opacity: 0.55; }
#precision-chapter .precision-primary { color: #fff; background: var(--precision-teal); font-weight: 700; }
#precision-chapter .precision-primary:hover:not(:disabled) { background: #084e46; }
#precision-chapter .precision-secondary { border-color: var(--precision-teal); background: #fff; color: var(--precision-teal); }
#precision-chapter .precision-text-button { padding-inline: 0; color: var(--precision-teal); background: transparent; text-decoration: underline; text-underline-offset: 4px; font-size: 15px; }
#precision-chapter .precision-versions { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
#precision-chapter .precision-versions button { font-size: 14px; border-color: #b9ccc3; background: #fff; color: var(--precision-ink); padding: 10px; }
#precision-chapter .precision-versions button[aria-pressed="true"] { border-color: var(--precision-blue); background: #edf1ff; color: var(--precision-blue); box-shadow: inset 0 -3px var(--precision-blue); }
#precision-chapter .precision-prompt { font-size: 17px; margin: 0 0 16px; background: transparent; padding: 0 14px 0 0; border-inline-start: 3px solid var(--precision-blue); }
#precision-chapter .precision-prompt p { margin-bottom: 10px; }
#precision-chapter mark { background: #f7edb7; color: var(--precision-ink); box-shadow: inset 0 -2px var(--precision-yellow); }
#precision-chapter .precision-change { color: var(--precision-blue); font-size: 15px; }
#precision-chapter .precision-game { min-width: 0; background: var(--precision-sage); border-radius: 8px; padding: 22px; align-self: start; }
#precision-chapter .precision-game-top { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 20px; }
#precision-chapter .precision-game-top h3 { margin: 0; }
#precision-chapter #precision-round { font-size: 14px; }
#precision-chapter .precision-fraction-choices { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
#precision-chapter .precision-fraction-choice { display: flex; flex-direction: column; align-items: center; width: 100%; gap: 14px; padding: 20px 12px 14px; color: var(--precision-ink); background: #fff; border: 2px solid #91aca0; border-radius: 8px; }
#precision-chapter .precision-fraction-choice:hover:not(:disabled) { border-color: var(--precision-teal); background: #f8fcfa; }
#precision-chapter .precision-fraction-choice:disabled { opacity: 1; }
#precision-chapter .precision-fraction-choice[data-answer="correct"] { border-color: var(--precision-teal); box-shadow: inset 0 0 0 2px var(--precision-teal); }
#precision-chapter .precision-fraction-choice[data-answer="wrong"] { border-style: dashed; border-color: #a2392f; }
#precision-chapter .precision-fraction { display: inline-grid; font-size: 36px; font-weight: 700; line-height: 1.1; text-align: center; direction: ltr; min-width: 44px; }
#precision-chapter .precision-fraction > span:first-child { border-bottom: 2px solid currentColor; padding-bottom: 5px; margin-bottom: 5px; }
#precision-chapter .precision-wholes { width: 100%; display: flex; flex-direction: column; gap: 7px; min-height: 55px; }
#precision-chapter .precision-whole { display: grid; grid-template-columns: repeat(var(--parts), minmax(0, 1fr)); height: 24px; border: 1px solid var(--precision-teal); border-radius: 2px; overflow: hidden; }
#precision-chapter .precision-piece { background: #fff; border-inline-end: 1px solid var(--precision-teal); }
#precision-chapter .precision-piece:last-child { border-inline-end: 0; }
#precision-chapter .precision-piece.is-filled { background: var(--precision-teal); }
#precision-chapter .precision-choice-label { font-size: 13px; }
#precision-chapter .precision-model-note { font-size: 13px; line-height: 1.5; margin: 12px 0 0; }
#precision-chapter .precision-feedback { min-height: 75px; margin: 16px 0; font-size: 16px; }
#precision-chapter .precision-feedback[data-tone="wrong"] { color: #852d25; }
#precision-chapter .precision-game-bottom { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; }
#precision-chapter .precision-game-bottom p { flex-basis: 100%; font-size: 14px; margin: 0; }
#precision-chapter .precision-observation { border-top: 1px solid #b9ccc3; margin-top: 24px; padding-top: 16px; }
#precision-chapter summary { cursor: pointer; min-height: 44px; padding-block: 8px; font-weight: 700; color: var(--precision-teal); }
#precision-chapter .precision-observation p { margin: 10px 0; }
#precision-chapter .precision-counting { background: #f3f6fc; border-color: #c0cee6; }
#precision-chapter .precision-counter-rails { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px; }
#precision-chapter .precision-counter-rail { padding-block: 6px 14px; min-width: 0; }
#precision-chapter .precision-counter-rail h3 { margin-bottom: 8px; }
#precision-chapter .precision-counter-rail p { margin-bottom: 10px; }
#precision-chapter .precision-counter-rail progress { appearance: none; -webkit-appearance: none; width: 100%; height: 13px; border: 0; border-radius: 20px; overflow: hidden; background: #d7e1e8; color: var(--precision-blue); accent-color: var(--precision-blue); }
#precision-chapter progress::-webkit-progress-bar { background: #d7e1e8; }
#precision-chapter progress::-webkit-progress-value { background: var(--precision-blue); }
#precision-chapter progress::-moz-progress-bar { background: var(--precision-blue); }
#precision-chapter .precision-counter-number { font-size: 22px; font-weight: 700; margin-block: 8px; }
#precision-chapter .precision-counter-actions { display: flex; flex-wrap: wrap; gap: 10px 16px; margin: 12px 0 18px; }
#precision-chapter .precision-counter-status { font-size: 16px; min-height: 54px; margin-bottom: 6px; }
#precision-chapter .precision-preset { text-align: start; margin-bottom: 14px; }
#precision-chapter .precision-writing { border: 0; border-block: 2px solid var(--precision-teal); border-radius: 0; background: #f7faf8; }
#precision-chapter .precision-writing-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-block: 18px 24px; }
#precision-chapter .precision-writing label { display: block; min-width: 0; font-size: 16px; }
#precision-chapter .precision-writing label > span,
#precision-chapter .precision-request-output > label { display: block; font-weight: 700; margin-bottom: 7px; }
#precision-chapter textarea { display: block; width: 100%; min-width: 0; resize: vertical; border: 1px solid #8da699; border-radius: 3px; padding: 12px; background: #fff; color: var(--precision-ink); line-height: 1.65; }
#precision-chapter textarea::placeholder { color: #53665c; opacity: 1; }
#precision-chapter .precision-writing-check { grid-column: 1 / -1; }
#precision-chapter #precision-composed { background: #fffdfa; }
#precision-chapter .precision-copy-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; margin-block: 16px; }
#precision-chapter .precision-copy-row p { margin: 0; font-size: 14px; }
#precision-chapter .precision-static-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px; }
#precision-chapter .precision-static-fractions { display: flex; align-items: center; gap: 20px; font-size: 28px; font-weight: 700; }
#precision-chapter .precision-static-fractions > span { font-size: 16px; font-weight: 400; }
#precision-chapter [hidden] { display: none !important; }
.precision-review-link { font-weight: 700; }
@media (max-width: 900px) {
  #precision-chapter .precision-workbench { grid-template-columns: 1fr; gap: 20px; }
  #precision-chapter .precision-game { max-width: 520px; width: 100%; justify-self: center; }
}
@media (max-width: 700px) {
  #precision-chapter .precision-experience { margin-inline: -7px; padding: 23px 16px; }
  #precision-chapter .precision-counter-rails,
  #precision-chapter .precision-writing-fields,
  #precision-chapter .precision-static-pair { grid-template-columns: 1fr; gap: 18px; }
  #precision-chapter .precision-game { padding: 16px 12px; }
  #precision-chapter .precision-fraction-choices { gap: 10px; }
  #precision-chapter .precision-fraction-choice { padding-inline: 8px; }
  #precision-chapter .precision-feedback { min-height: 0; }
  header nav { flex-wrap: wrap; gap: 8px 18px; }
  header nav span { flex-basis: 100%; }
  html { scroll-padding-top: 120px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  #precision-chapter .precision-experience { margin: 24px 0; padding: 16px; font-size: 11pt; background: white; break-inside: auto; }
  #precision-chapter .precision-live { display: none !important; }
  #precision-chapter .precision-static[hidden] { display: block !important; }
  #precision-chapter .precision-note { font-size: 10pt; }
  #precision-chapter .precision-kind { font-size: 10pt; }
  #precision-chapter .precision-chapter-title { font-size: 30pt; }
  #precision-chapter .precision-static-pair { display: block; }
  #precision-chapter .precision-static-pair > div { break-inside: avoid; }
}