:root {
  font-family: ui-rounded, 'Arial Rounded MT Bold', system-ui, sans-serif;
  color: #171821;
  background: #d5ddd2;
  font-synthesis: none;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-height: 100svh;
  background:
    radial-gradient(circle at 96% 6%, #c7c9da 0 110px, transparent 112px),
    radial-gradient(circle at 2% 85%, #c2d4a8 0 90px, transparent 92px);
}
header {
  min-height: 70px;
  background: #fffdf8;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 4%;
  border-bottom: 3px solid #e7e2d5;
}
a {
  color: inherit;
  font-weight: 750;
  text-underline-offset: 4px;
}
.brand {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 9px;
}
.brand span {
  background: #cafa70;
  border-radius: 8px;
  padding: 2px 10px;
  font-size: 24px;
  transform: rotate(-5deg);
}
main {
  max-width: 1180px;
  margin: 36px auto;
  padding: 0 24px 32px;
}
h1 {
  font-size: clamp(2.6rem, 4.5vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin: 12px 0 24px;
}
h2 {
  font-size: 1.7rem;
  line-height: 1.25;
  margin: 8px 0 22px;
}
p {
  line-height: 1.6;
}
.eyebrow {
  text-transform: uppercase;
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  color: #4852cf;
}
.lead {
  font-size: 1.15rem;
  color: #404549;
}
.setup-card,
.finish-card {
  padding: 32px;
  background: #20213b;
  border: 2px solid #34365c;
  box-shadow: 0 8px 0 #11121e;
  border-radius: 26px;
  color: #fffdf8;
  margin-top: 30px;
  max-width: 840px;
}
.setup-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  align-items: center;
  gap: 36px;
}
.setup-card p,
.finish-card p {
  color: #d9daec;
}
.mini-pie {
  width: 180px;
  aspect-ratio: 1;
  border: 5px solid #fffdf8;
  border-radius: 50%;
  background: conic-gradient(#5c66e8 0 74%, #f7f4ed 74% 75%, #cafa70 75%);
  box-shadow: 0 8px 0 #11121e;
}
button {
  min-height: 48px;
  border: 2px solid #777aa1;
  border-radius: 13px;
  padding: 12px 20px;
  background: #30314f;
  color: white;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 0 #11121e;
}
button:hover:not(:disabled) {
  border-color: #cafa70;
  background: #414465;
}
button:disabled {
  opacity: 0.5;
  cursor: default;
}
button:focus-visible,
a:focus-visible {
  outline: 3px solid #5c66e8;
  outline-offset: 5px;
}
.controls button:focus-visible,
.setup-card button:focus-visible {
  outline-color: #cafa70;
}
.primary {
  background: #cafa70;
  color: #171821;
  border-color: #cafa70;
  box-shadow: 0 4px 0 #8fa947;
}
.primary:hover:not(:disabled) {
  background: #d8f99f;
}
fieldset {
  border: 0;
  padding: 0;
  margin: 20px 0 24px;
  display: flex;
  gap: 12px;
}
legend {
  padding: 0;
  margin-bottom: 12px;
  color: #d9daec;
  font-size: 0.85rem;
}
fieldset button[aria-pressed='true'] {
  background: #cafa70;
  color: #171821;
  border-color: #cafa70;
}
#play {
  min-height: calc(100svh - 174px);
  display: flex;
  align-items: center;
}
.board-heading {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 24px;
  align-items: center;
  color: white;
}
.stat-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: #30314f;
  border-radius: 20px;
}
.stat-chip span {
  color: #e4e5f4;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.stat-chip strong {
  font-size: 2.3rem;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
#time.urgent {
  color: #cafa70;
}
#target-heading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  font-size: 2.1rem;
  margin: 0;
  padding: 0 16px;
}
.percentage {
  font-size: 2.6rem;
  color: #cafa70;
  white-space: nowrap;
}
.board {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 1fr);
  width: 100%;
  gap: 20px;
  padding: 20px;
  border: 2px solid #34365c;
  border-radius: 26px;
  background: #20213b;
  box-shadow:
    0 9px 0 #11121e,
    0 25px 55px rgb(23 24 33 / 20%);
  overflow: hidden;
}
.canvas {
  border-radius: 20px;
  padding: 20px 32px 26px;
  background: #fffdf8;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}
#pie {
  width: min(100%, 310px);
  display: block;
  overflow: visible;
}
#pie-caption {
  margin: 4px 0 16px;
  color: #62636b;
  text-align: center;
  min-height: 26px;
}
.tools {
  display: flex;
  gap: 14px;
  width: 100%;
  max-width: 400px;
}
.tools button {
  flex: 1;
  background: #fffdf8;
  border: 2px solid #20213b;
  color: #20213b;
  box-shadow: 0 4px 0 #d6d3ca;
  font-size: 1.1rem;
}
.tools button span {
  display: inline-block;
  background: #e7e8ef;
  border-radius: 6px;
  padding: 2px 7px;
  margin-left: 6px;
}
.tools button[aria-expanded='true'] {
  background: #cafa70;
}
.tools button:hover:not(:disabled) {
  background: #e9efdc;
}
.controls {
  border-radius: 20px;
  background: #30314f;
  padding: 30px;
  color: white;
  display: flex;
  flex-direction: column;
}
.controls .eyebrow {
  color: #cafa70;
}
.controls p {
  color: #d9daec;
}
#keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
#keypad button {
  min-height: 54px;
  font-size: 1.15rem;
  padding: 10px;
}
#keypad button[aria-pressed='true'] {
  background: #cafa70;
  color: #171821;
}
#feedback:not(:empty) {
  padding: 16px;
  border: 1px solid #777aa1;
  border-radius: 14px;
  background: #20213b;
}
#feedback {
  min-height: 52px;
  margin: 18px 0;
}
#check,
#next {
  margin-top: auto;
}
.quiet {
  background: transparent;
  box-shadow: none;
  border: 0;
  text-decoration: underline;
  margin-top: 12px;
  font-size: 0.85rem;
}
.home {
  display: block;
  margin-top: 24px;
}
#finish-heading:focus,
#target-heading:focus {
  outline: none;
}
[hidden] {
  display: none !important;
}
@media (max-width: 760px) {
  header {
    padding: 12px 16px;
    font-size: 0.8rem;
  }
  .brand {
    gap: 5px;
  }
  .brand span {
    font-size: 18px;
    padding: 2px 7px;
  }
  main {
    margin-top: 24px;
    padding-inline: 16px;
  }
  .board {
    grid-template-columns: 1fr;
  }
  .canvas {
    padding: 18px 20px 24px;
  }
  #pie {
    width: 240px;
  }
  .controls {
    padding: 24px;
  }
  .setup-card {
    grid-template-columns: 1fr;
    padding: 24px;
    gap: 22px;
  }
  .mini-pie {
    width: 120px;
  }
  #play {
    min-height: 0;
  }
  .board {
    padding: 12px;
    gap: 12px;
  }
  .board-heading {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  #target-heading {
    grid-column: 1 / -1;
    grid-row: 1;
    padding: 8px 0;
  }
  .stat-chip {
    padding: 14px 12px;
    border-radius: 14px;
    gap: 8px;
  }
  .stat-chip span {
    font-size: 0.62rem;
    letter-spacing: 0.03em;
  }
  .stat-chip strong {
    font-size: 1.65rem;
  }
  h1 {
    font-size: 2.6rem;
  }
  #target-heading {
    font-size: 2.4rem;
  }
  .percentage {
    font-size: 1.8rem;
  }
  .setup-card fieldset {
    gap: 8px;
  }
  .setup-card fieldset button {
    padding: 10px 15px;
  }
}

#picker {
  width: min(440px, calc(100vw - 32px));
  max-height: calc(100svh - 32px);
  padding: 28px;
  border: 2px solid #777aa1;
  border-radius: 24px;
  background: #30314f;
  color: white;
  box-shadow:
    0 12px 0 #11121e,
    0 28px 80px #11121e66;
}
#picker::backdrop {
  background: rgb(17 18 30 / 65%);
}
#picker .eyebrow {
  color: #cafa70;
}
#picker button:focus-visible {
  outline-color: #cafa70;
}
#picker .quiet {
  width: 100%;
}
body:has(#picker[open]) {
  overflow: hidden;
}
@media (max-width: 450px) {
  #picker {
    padding: 22px;
  }
}

/* Keep the workspace focused on the pie; feedback and submission share its footer. */
.board {
  grid-template-columns: minmax(0, 1fr);
}
.canvas {
  padding: 16px 24px 24px;
}
.controls {
  flex-direction: row;
  align-items: center;
  gap: 20px;
  padding: 16px 24px;
}
#feedback {
  flex: 1;
  min-height: 0;
  margin: 0;
}
#feedback:not(:empty) {
  padding: 0;
  border: 0;
  background: none;
}
#check,
#next {
  margin-top: 0;
  margin-left: auto;
  min-width: 220px;
}
@media (max-width: 760px) {
  .controls {
    flex-direction: column;
    gap: 12px;
    padding: 16px;
  }
  #feedback:empty {
    display: none;
  }
  #check,
  #next {
    width: 100%;
    min-width: 0;
  }
}

.tools {
  margin-top: 18px;
}
.tools button {
  min-height: 58px;
  border-radius: 14px;
  border: 2px solid #4049bf;
  background: #5c66e8;
  color: white;
  box-shadow: 0 5px 0 #363e9c;
}
.tools button::after {
  content: '▾';
  margin-left: 10px;
  font-size: 1rem;
}
.tools button span {
  background: rgb(255 255 255 / 18%);
}
.tools button:hover:not(:disabled) {
  background: #4852d2;
  border-color: #30399e;
}
.tools button[aria-expanded='true'] {
  background: #4852d2;
}
.tools button:active:not(:disabled) {
  transform: translateY(2px);
  box-shadow: 0 3px 0 #363e9c;
}

.board-heading {
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 16px;
}
.stat-chip {
  gap: 12px;
  padding: 12px 16px;
  border-radius: 14px;
}
.stat-chip span {
  font-size: 0.66rem;
  letter-spacing: 0.04em;
}
.stat-chip strong {
  font-size: 1.65rem;
}
@media (max-width: 760px) {
  .board-heading {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: 8px;
  }
  #target-heading {
    grid-column: 2;
    grid-row: 1;
    font-size: 1.1rem;
    gap: 6px;
    padding: 8px 0;
  }
  .percentage {
    font-size: 1.6rem;
  }
  .stat-chip {
    flex-direction: column;
    gap: 5px;
    padding: 10px 8px;
    justify-self: start;
  }
  .stat-chip:last-child {
    justify-self: end;
  }
  .stat-chip span {
    font-size: 0.54rem;
    letter-spacing: 0;
    white-space: nowrap;
  }
  .stat-chip strong {
    font-size: 1.25rem;
  }
}

.board-heading > .stat-chip {
  justify-self: start;
}
.board-heading > .stat-chip:last-child {
  justify-self: end;
}

#intro {
  min-height: calc(100svh - 174px);
  display: grid;
  place-items: center;
}
#intro .setup-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  width: min(100%, 540px);
  margin: 0;
  padding: clamp(24px, 4vw, 42px);
  text-align: center;
}
#intro h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin: 0 0 12px;
}
#intro .setup-card > p {
  margin: 0;
}
#intro fieldset {
  justify-content: center;
  margin: 28px 0;
}
#intro fieldset button {
  flex: 1;
}
#intro #account-status {
  margin-top: 18px;
  font-size: 0.8rem;
}
#intro #account-status:empty {
  display: none;
}

#feedback {
  transform-origin: left center;
}
#feedback:not(:empty) {
  flex: 0 1 auto;
  padding: 12px 18px;
  border: 2px solid transparent;
  border-radius: 12px;
  font-weight: 800;
  line-height: 1.45;
}
#feedback[data-kind='instruction']:not(:empty) {
  background: #fff0a6;
  border-color: #ecd46a;
  color: #51400b;
}
#feedback[data-kind='incorrect']:not(:empty) {
  background: #ffd9da;
  border-color: #f09a9e;
  color: #84232c;
}
#feedback[data-kind='correct']:not(:empty) {
  background: #cafa70;
  border-color: #a4d64d;
  color: #25431a;
}
@media (max-width: 760px) {
  #feedback:not(:empty) {
    width: 100%;
  }
}

#feedback:not(:empty) {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}
#feedback[data-kind='instruction']:not(:empty) {
  background: transparent;
  color: #fff0a6;
}
#feedback[data-kind='incorrect']:not(:empty) {
  background: transparent;
  color: #ffadb3;
}
#feedback[data-kind='correct']:not(:empty) {
  background: transparent;
  color: #cafa70;
}

.shade-display {
  grid-column: 1 / -1;
  padding: 10px;
  text-align: center;
  font-size: 2rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

@media (min-width: 761px) {
  .canvas {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 190px;
    align-items: center;
    gap: 28px;
    padding: 28px 40px;
  }
  #pie {
    justify-self: center;
  }
  .tools {
    flex-direction: column;
    width: 100%;
    margin-top: 0;
    gap: 18px;
  }
  .tools button {
    flex: none;
  }
}

@media (min-width: 761px) {
  .canvas {
    grid-template-columns: minmax(0, 310px) 170px;
    justify-content: center;
    gap: 24px;
  }
}

#play .board {
  max-width: 960px;
  margin-inline: auto;
}

#intro #modes {
  margin: 24px 0 0;
}
.pie-label {
  font-size: 1rem;
  margin: 0;
  text-align: center;
}
#pie-2 {
  width: min(100%, 260px);
  display: block;
}
.board.two-pies {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.two-pies .canvas {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
}
.two-pies #pie {
  width: min(100%, 260px);
}
.two-pies .tools {
  flex-direction: row;
  gap: 10px;
  margin: 0;
  max-width: 330px;
}
.two-pies .tools button {
  flex: 1;
  min-width: 0;
  padding: 10px;
  font-size: 0.9rem;
}
.two-pies .tools button span {
  margin-left: 3px;
  padding: 2px 5px;
}
.two-pies .tools button::after {
  margin-left: 5px;
}
.two-pies .controls {
  grid-column: 1 / -1;
}
@media (max-width: 650px) {
  .board.two-pies {
    grid-template-columns: 1fr;
  }
  .two-pies #pie,
  .two-pies #pie-2 {
    width: 210px;
  }
}

#menu {
  min-height: calc(100svh - 174px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 960px;
  margin-inline: auto;
}
#menu h1 {
  margin-bottom: 30px;
}
.game-menu {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  padding: 24px;
  border: 2px solid #34365c;
  border-radius: 28px;
  background: #20213b;
  box-shadow: 0 9px 0 #11121e;
}
.game-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  text-align: left;
  padding: 30px;
  border-radius: 20px;
  min-height: 245px;
}
.game-card .eyebrow {
  color: #d9daec;
}
.game-card strong {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
}
.game-card > span:not(.game-start) {
  color: #d9daec;
}
.game-start {
  margin-top: auto;
  padding: 10px 16px;
  border-radius: 999px;
  background: #cafa70;
  color: #171821;
}
#menu-title:focus,
#game-title:focus {
  outline: none;
}
#choose-game {
  color: #d9daec;
  margin-top: 22px;
}
@media (max-width: 650px) {
  .game-menu {
    grid-template-columns: 1fr;
    padding: 16px;
    gap: 16px;
  }
  .game-card {
    min-height: 210px;
    padding: 24px;
  }
  #menu {
    min-height: 0;
  }
}

#intro {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
#intro > h1 {
  max-width: 820px;
  margin: 0 0 42px;
  font-size: clamp(2.5rem, 4.2vw, 4rem);
}
#intro .setup-card {
  width: min(700px, 100%);
  padding: clamp(26px, 5vw, 48px);
}
#intro #game-title {
  margin: 0 0 24px;
  font-weight: 800;
}
.duration-setting {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
}
.duration-setting > span {
  color: #d9daec;
  font-size: 0.85rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
#intro #durations {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  min-width: 0;
  margin: 0;
}
#durations button {
  min-height: 62px;
  padding: 10px;
  border-radius: 16px;
  font-size: 1.35rem;
}
#intro #game-description {
  margin: 28px 0;
}
.duration-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
}
#intro #choose-game {
  margin: 0;
  background: #fffdf8;
  color: #171821;
  border-color: #171821;
}
.duration-actions .primary {
  border-radius: 999px;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
#duration-title:focus {
  outline: none;
}
.result-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin: 24px 0;
}
.result-stats > div {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border-radius: 16px;
  background: #30314f;
}
.result-stats strong {
  font-size: 2.5rem;
  color: #cafa70;
}
.result-stats span {
  color: #d9daec;
}
@media (max-width: 550px) {
  .duration-setting {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  #intro > h1 {
    margin-bottom: 28px;
  }
  .result-stats > div {
    padding: 14px;
  }
}

/* All counts are direct choices, including large pies. Keep the modal compact. */
#keypad {
  max-height: min(380px, 52svh);
  overflow-y: auto;
  padding: 6px 8px 8px 6px;
  scrollbar-gutter: stable;
  overscroll-behavior: contain;
}

/* Match Geometry Lab's duration screen, including its mobile layout. */
body:has(#intro:not([hidden])) main {
  max-width: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0 0 56px;
}
#intro {
  width: min(1180px, calc(100% - 32px));
  margin-inline: auto;
  min-height: calc(100svh - 68px - clamp(30px, 5vw, 52px) - 56px);
  transform: translateY(clamp(-100px, -5vh, -48px));
}
#intro > h1 {
  max-width: 820px;
  margin: 0 0 52px;
  font-size: clamp(2.5rem, 4.2vw, 4rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
  word-spacing: 0.025em;
}
#intro .setup-card {
  display: block;
  width: min(700px, 100%);
  margin: 0;
  padding: clamp(26px, 5vw, 48px);
  border: 2px solid #34365c;
  border-radius: 28px;
  background: #20213b;
  box-shadow:
    0 9px 0 #11121e,
    0 25px 55px rgb(23 24 33 / 20%);
}
#intro .duration-setting {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
}
#intro #durations {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  border: 0;
}
#intro #durations button {
  min-height: 62px;
  padding: 0;
  border: 2px solid #777aa1;
  border-radius: 16px;
  background: rgb(240 240 255 / 14%);
  color: white;
  font-size: 1.35rem;
  font-weight: 900;
  box-shadow: none;
}
#intro #durations button[aria-pressed='true'] {
  border-color: #cafa70;
  background: #cafa70;
  box-shadow: 0 5px 0 #8fa947;
  color: #171821;
}
#intro #game-description {
  margin: 28px auto;
  color: #d9daec;
  line-height: 1.5;
}
#intro .duration-actions {
  display: flex;
  flex-direction: row;
  justify-content: center;
  gap: 12px;
}
#intro #choose-game {
  min-height: 50px;
  margin: 0;
  padding: 11px 18px;
  border: 2px solid #171821;
  border-radius: 13px;
  font-weight: 900;
  background: #fffdf8;
  box-shadow: 0 4px 0 #d6d3ca;
  color: #171821;
}
#intro #start {
  min-height: 50px;
  padding: 11px 22px;
  border: 0;
  border-radius: 999px;
  background: #cafa70;
  box-shadow: 0 5px 0 #8fa947;
  color: #171821;
  font-weight: 900;
}
@media (max-width: 600px) {
  body:has(#intro:not([hidden])) main {
    margin-top: 34px;
    padding-bottom: 36px;
  }
  #intro {
    min-height: calc(100svh - 68px - 34px - 36px);
    justify-content: flex-start;
    transform: none;
  }
  #intro > h1 {
    margin-bottom: 32px;
    font-size: clamp(2.25rem, 10vw, 3.2rem);
  }
  #intro .setup-card {
    padding: 24px 18px;
    border-radius: 22px;
  }
  #intro .duration-setting {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  #intro .duration-unit {
    margin-top: -5px;
  }
  #intro .duration-actions {
    flex-direction: column-reverse;
  }
  #intro .duration-actions button {
    width: 100%;
  }
}
/* Long Division uses the same duration screen and board language as Percentages. */
.division-board{max-width:1080px;margin:auto;padding:24px;border:2px solid #48496e;border-radius:28px;background:#22233b;box-shadow:0 9px 0 #11121e}
.division-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px}.division-heading h1{font-size:32px;margin:0;color:#cafa70}.division-heading .stat-chip{display:flex;align-items:center;gap:22px;padding:14px 20px;min-width:0}.division-heading .stat-chip strong{font-size:30px}.division-heading .stat-chip span{font-size:12px}
.division-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:22px}.paper{background-color:#f7f4ed;background-image:linear-gradient(to right,#ddd9ce 1px,transparent 1px),linear-gradient(to bottom,#ddd9ce 1px,transparent 1px);background-size:44px 44px;border:2px solid #c3c9b7;box-shadow:0 5px 0 #526b53;border-radius:22px;padding:24px 14px;display:grid;place-items:center;min-height:420px;color:#22233b}.answer-panel{background:#32334f;border-radius:22px;padding:24px;display:flex;flex-direction:column;justify-content:center;gap:26px}.answer-panel h2{font-size:14px;color:#eeeef7;text-align:center;margin:0;letter-spacing:.06em;text-transform:uppercase}#number-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}#number-pad button{min-width:0;min-height:54px;padding:8px;background:#5c66e8;border:2px solid #8289ec;box-shadow:0 5px 0 #262b76;color:white;font-size:24px;border-radius:14px}#number-pad .delete-key{grid-column:span 2;background:#494c68;border-color:#777b99;font-size:16px}
#working{--cell:44px;display:grid;grid-template-columns:repeat(var(--cols),var(--cell));grid-template-rows:repeat(var(--rows),var(--cell));font-size:28px;font-weight:800;font-variant-numeric:tabular-nums}.digit{display:grid;place-items:center}.division-bracket{border-top:3px solid #22233b;border-left:3px solid #22233b;pointer-events:none}.subtract-line{border-bottom:2px solid #585b66;z-index:2;pointer-events:none}.answer-box{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;align-items:center;text-align:center;background:#f0ede5;border:1px solid #d8d4c8;border-radius:0;min-width:0}.answer-box.done{background:transparent;border-color:transparent}.answer-box.active{background:#cafa70;border:2px solid #7b9945;box-shadow:0 0 0 3px #cafa7040}.answer-box.correct{animation:correct-pulse .45s ease-in-out}.division-feedback{margin-top:22px;padding:16px 22px;background:#32334f;border-radius:20px;display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:80px}.division-feedback #feedback{margin:0;font-size:20px;color:#f6dc7d;transform-origin:left center}.division-feedback #feedback[data-kind=correct]{color:#cafa70}.division-feedback #feedback[data-kind=incorrect]{color:#ffaaa7}.division-feedback button{flex-shrink:0}
@keyframes correct-pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.2)}}@media(prefers-reduced-motion:reduce){.answer-box.correct{animation:none}}@media(max-width:720px){.division-board{padding:14px}.division-heading{flex-wrap:wrap;gap:10px}.division-heading h1{order:-1;width:100%;font-size:28px;text-align:center}.division-heading .stat-chip{padding:10px;gap:12px}.division-heading .stat-chip span{font-size:10px}.division-heading .stat-chip strong{font-size:24px}.division-layout{grid-template-columns:1fr;gap:16px}.paper{min-height:0;padding:20px 6px}.answer-panel{padding:16px;gap:12px}#number-pad{max-width:280px;width:100%;margin:auto}.division-feedback{flex-direction:column;align-items:stretch;padding:16px}.division-feedback #feedback{font-size:17px}}@media(max-width:380px){#working{--cell:38px;font-size:25px}}
.division-board{width:100%;color:#f7f4ed}.division-heading .stat-chip strong{color:#f7f4ed}

.mode-options{display:flex;gap:12px;margin-bottom:28px}.mode-options button{flex:1;padding:14px 12px;font-size:16px}.mode-options button[aria-pressed="true"]{background:#cafa70;border-color:#cafa70;color:#171821}#end-learning{font-size:15px;padding:14px 18px}#duration-setting[hidden],#timer-chip[hidden],#rate-stat[hidden]{display:none}@media(max-width:480px){.mode-options{flex-direction:column}}

/* Canvas appearance stays independent of the surrounding game controls. */
.paper{position:relative;padding-bottom:76px;--paper-fill:#f7f4ed;--paper-grid:#ddd9ce;--paper-ink:#22233b;--box-fill:#f0ede5;--box-border:#d8d4c8;background-color:var(--paper-fill);background-image:linear-gradient(to right,var(--paper-grid) 1px,transparent 1px),linear-gradient(to bottom,var(--paper-grid) 1px,transparent 1px);color:var(--paper-ink)}
.paper.dark-canvas{--paper-fill:#191c2e;--paper-grid:#30354b;--paper-ink:#f7f4ed;--box-fill:#272c43;--box-border:#535b76;border-color:#575e7a;box-shadow:0 5px 0 #111421}
.paper .division-bracket{border-color:var(--paper-ink)}.paper .subtract-line{border-color:var(--paper-ink)}.paper .answer-box{background:var(--box-fill);border-color:var(--box-border)}.paper .answer-box.done{background:transparent;border-color:transparent}.paper .answer-box.active{background:#cafa70;border-color:#7b9945;color:#22233b}
#canvas-theme{position:absolute;right:14px;bottom:14px;display:flex;align-items:center;gap:12px;padding:9px 14px;min-height:44px;background:var(--paper-fill);color:var(--paper-ink);border:2px solid var(--box-border);border-radius:24px;box-shadow:none;font-size:14px}
.theme-track{display:block;width:38px;height:22px;border-radius:14px;background:#a5a8b3;padding:3px}.theme-track::after{content:'';display:block;width:16px;height:16px;border-radius:50%;background:#fff;transition:transform .15s}#canvas-theme[aria-checked="true"] .theme-track{background:#cafa70}#canvas-theme[aria-checked="true"] .theme-track::after{transform:translateX(16px);background:#22233b}@media(prefers-reduced-motion:reduce){.theme-track::after{transition:none}}

/* Keep the division canvas language, with room for six-digit products. */
.difficulty-options{border:0;padding:0;margin:0 0 20px;display:flex;flex-wrap:wrap;gap:10px}
.difficulty-options legend{font-weight:800;margin-bottom:12px}
.difficulty-options button{flex:1;min-width:130px;font-size:14px;padding:12px}
.difficulty-options button[aria-pressed="true"]{background:#cafa70;color:#171821;border-color:#7b9945}
.instructions{max-width:600px;font-size:15px;line-height:1.5;margin:0 0 24px}
.answer-box[hidden]{display:none}
.carry-box{font-size:18px;border-radius:50%;margin:5px}
.paper{min-width:0}
@media(max-width:420px){#working{--cell:34px;font-size:24px}.division-board{padding:10px}.paper{padding-left:2px;padding-right:2px}.carry-box{font-size:15px;margin:3px}}
@media(max-width:350px){#working{--cell:29px;font-size:22px}}

/* Choose a digit game before setting the pace, like the 3D challenges. */
#selection{width:min(1100px,100%);margin:auto;text-align:left}
#selection h1{font-size:clamp(36px,5vw,64px);margin:0 0 32px}
.digit-games{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;padding:26px;border:2px solid #48496e;border-radius:28px;background:#22233b;box-shadow:0 9px 0 #11121e}
.digit-game{display:flex;flex-direction:column;align-items:flex-start;gap:20px;min-height:225px;padding:26px 22px;border:2px solid #777aa1;border-radius:22px;background:#32334f;color:#f7f4ed;text-align:left;box-shadow:0 6px 0 #11121e}
.digit-game strong{font-size:clamp(20px,2.1vw,28px);line-height:1.2}
.digit-example{color:#d9daec;font-size:18px}
.digit-start{margin-top:auto;padding:10px 14px;border-radius:999px;background:#cafa70;color:#171821;font-size:15px;font-weight:900}
#intro #selected-game{margin:0 0 14px;color:#48496e;font-size:15px}
@media(max-width:720px){.digit-games{grid-template-columns:1fr;padding:18px}.digit-game{min-height:160px;gap:14px}#selection h1{font-size:36px}}