/* All game styles are scoped; theme and projector palette belong to the host. */
.activity-mount { min-width: 0; }
.activity-engine {
  --ae-accent: var(--accent, #6753c6);
  --ae-text: var(--text, #252841);
  --ae-muted: var(--muted, #646879);
  --ae-surface: var(--surface, #fff);
  --ae-line: var(--line, #dedee9);
  --ae-good: var(--mint, #9cdfc2);
  --ae-warm: var(--yellow, #f7d887);
  color: var(--ae-text);
  font: inherit;
  min-width: 0;
  overflow-wrap: anywhere;
}
.activity-engine *, .activity-engine *::before, .activity-engine *::after { box-sizing: border-box; }
.activity-engine [hidden] { display: none !important; }
.activity-engine .ae-instruction { color: var(--ae-muted); line-height: 1.65; margin: 0 0 1.4rem; max-width: 70ch; font-size: 1rem; }
.activity-engine .ae-body { display: grid; gap: 1.1rem; min-width: 0; }
.activity-engine .ae-button {
  appearance: none; position: relative; display: inline-flex; justify-content: center; align-items: center; gap: .55rem;
  min-height: 48px; min-width: 48px; padding: .8rem 1rem; border: 2px solid var(--ae-line); border-radius: 16px;
  background: var(--ae-surface); color: var(--ae-text); font: inherit; font-weight: 650; line-height: 1.4; text-align: center;
  cursor: pointer; touch-action: manipulation; -webkit-tap-highlight-color: transparent;
  transition: background-color 150ms, border-color 150ms, transform 150ms, box-shadow 150ms;
}
.activity-engine .ae-button:not(:disabled):hover { border-color: var(--ae-accent); background: color-mix(in srgb, var(--ae-accent) 7%, var(--ae-surface)); transform: translateY(-2px); }
.activity-engine .ae-button:not(:disabled):active { transform: translateY(0); }
.activity-engine .ae-button:focus-visible { outline: 3px solid var(--ae-accent); outline-offset: 4px; z-index: 1; }
.activity-engine .ae-button:disabled { cursor: default; }
.activity-engine .ae-button:disabled:not(.is-correct):not(.is-selected) { opacity: .68; }
.activity-engine .ae-button.is-selected { border-color: var(--ae-accent); background: color-mix(in srgb, var(--ae-accent) 12%, var(--ae-surface)); box-shadow: 0 0 0 2px color-mix(in srgb, var(--ae-accent) 18%, transparent); }
.activity-engine .is-correct { border-color: color-mix(in srgb, var(--ae-good) 65%, var(--ae-text)); background: color-mix(in srgb, var(--ae-good) 28%, var(--ae-surface)); }
.activity-engine .ae-button.is-correct { opacity: 1; }
.activity-engine .ae-primary { justify-self: start; border-color: var(--ae-accent); background: var(--ae-accent); color: #fff; padding: .85rem 1.4rem; }
.activity-engine .ae-primary:not(:disabled):hover { color: #fff; background: color-mix(in srgb, var(--ae-accent) 86%, #000); }
.activity-engine .ae-primary:disabled { opacity: .55; }
.activity-engine .ae-options { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 155px), 1fr)); gap: .9rem; }
.activity-engine .ae-card { min-height: 124px; flex-direction: column; padding: 1.3rem 1rem; }
.activity-engine .ae-icon { font-size: clamp(2.1rem, 4vw, 3.2rem); line-height: 1.25; }
.activity-engine .ae-label { display: block; max-width: 100%; }
.activity-engine .ae-check { position: absolute; right: .65rem; top: .5rem; font-size: 1.2rem; font-weight: 850; }
.activity-engine .ae-symbol { font-size: clamp(1.8rem, 5vw, 2.7rem); min-height: 90px; }
.activity-engine .ae-options--compact { grid-template-columns: repeat(auto-fit, minmax(min(100%, 72px), 1fr)); max-width: 660px; }
.activity-engine .ae-progress { margin: 0; font-size: .92rem; font-weight: 600; color: var(--ae-muted); }
.activity-engine .ae-count-tray { display: flex; flex-wrap: wrap; justify-content: center; gap: .6rem; padding: 1.25rem; border: 1px dashed var(--ae-line); border-radius: 24px; background: color-mix(in srgb, var(--ae-accent) 3%, var(--ae-surface)); }
.activity-engine .ae-count-item { font-size: 2rem; width: 68px; height: 68px; padding: .45rem; border-radius: 50%; }
.activity-engine .ae-count-mark { position: absolute; right: -2px; top: -4px; width: 24px; height: 24px; border-radius: 50%; color: var(--ae-text); background: var(--ae-good); font-size: 1rem; display: grid; place-items: center; }
.activity-engine .ae-pattern { display: flex; flex-wrap: wrap; align-items: center; gap: .55rem; padding: 1rem; background: color-mix(in srgb, var(--ae-accent) 4%, var(--ae-surface)); border-radius: 22px; }
.activity-engine .ae-pattern-chip { display: grid; place-items: center; min-width: 58px; min-height: 66px; font-size: clamp(1.8rem, 4vw, 2.7rem); padding: .35rem; }
.activity-engine .ae-pattern-missing { border: 2px dashed var(--ae-accent); border-radius: 16px; color: var(--ae-accent); font-weight: 750; background: var(--ae-surface); }
.activity-engine .ae-pairs { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(.7rem, 5vw, 3rem); }
.activity-engine .ae-pair-column { display: grid; gap: .65rem; align-content: start; }
.activity-engine .ae-pair-column .ae-card { min-height: 84px; padding: .8rem; font-size: 1.05rem; }
.activity-engine .ae-column-label { color: var(--ae-muted); font-size: .9rem; padding-left: .4rem; }
.activity-engine .ae-pair-solutions { display: grid; gap: .7rem; }
.activity-engine .ae-pair-solution { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 1rem; align-items: center; padding: 1rem; border-radius: 16px; border: 1px solid var(--ae-good); background: color-mix(in srgb, var(--ae-good) 15%, var(--ae-surface)); font-size: 1.1rem; }
.activity-engine .ae-link-symbol { color: var(--ae-muted); font-size: 1.5rem; }
.activity-engine .ae-sort-tray, .activity-engine .ae-step-bank { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 140px), 1fr)); gap: .7rem; }
.activity-engine .ae-sort-tray .ae-card { min-height: 105px; }
.activity-engine .ae-sort-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 190px), 1fr)); gap: .8rem; }
.activity-engine .ae-sort-bucket { min-width: 0; padding: .7rem; border: 2px dashed var(--ae-line); border-radius: 24px; background: color-mix(in srgb, var(--ae-good) 6%, var(--ae-surface)); }
.activity-engine .ae-category-button { width: 100%; min-height: 105px; border-style: solid; }
.activity-engine .ae-sorted-list { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; padding: 0; margin: .8rem 0 0; }
.activity-engine .ae-sorted-item { padding: .45rem .65rem; border-radius: 10px; background: color-mix(in srgb, var(--ae-good) 24%, var(--ae-surface)); font-size: .93rem; }
.activity-engine .ae-bucket-empty { margin: .8rem .25rem .4rem; color: var(--ae-muted); font-size: .87rem; }
.activity-engine .ae-sequence-list, .activity-engine .ae-offline-steps { list-style: none; display: grid; gap: .65rem; padding: 0; margin: 0; }
.activity-engine .ae-step { display: flex; align-items: center; gap: .75rem; min-height: 74px; padding: .7rem; border: 1px solid var(--ae-line); border-radius: 16px; background: var(--ae-surface); }
.activity-engine .ae-step-number { flex: 0 0 36px; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; background: color-mix(in srgb, var(--ae-accent) 12%, var(--ae-surface)); color: var(--ae-text); font-size: 1rem; font-weight: 750; }
.activity-engine .ae-step-text { flex: 1; min-width: 0; text-align: left; line-height: 1.5; }
.activity-engine .ae-step-controls { display: flex; gap: .3rem; flex-shrink: 0; }
.activity-engine .ae-icon-button { width: 44px; min-width: 44px; height: 44px; min-height: 44px; padding: .3rem; border-radius: 11px; font-size: 1.15rem; }
.activity-engine .ae-sequence-placeholder { padding: 1.7rem 1rem; border: 2px dashed var(--ae-line); border-radius: 16px; color: var(--ae-muted); text-align: center; }
.activity-engine .ae-step-bank .ae-card { min-height: 105px; }
.activity-engine .ae-spatial-prompt { margin: 0; font-weight: 650; line-height: 1.5; font-size: 1.1rem; }
.activity-engine .ae-spatial { display: grid; gap: .6rem; width: min(100%, 510px); justify-self: center; }
.activity-engine .ae-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.activity-engine .ae-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.activity-engine .ae-cell { aspect-ratio: 1; min-width: 44px; min-height: 62px; padding: .7rem; border-radius: 18px; }
.activity-engine .ae-cell-coordinate { position: absolute; left: .5rem; top: .4rem; font-size: .72rem; font-weight: 600; color: var(--ae-muted); }
.activity-engine .ae-cell-symbol { font-size: clamp(1.7rem, 4vw, 3rem); line-height: 1; }
.activity-engine .ae-materials, .activity-engine .ae-reflection { padding: 1.15rem 1.3rem; border-radius: 20px; border: 1px solid var(--ae-line); background: color-mix(in srgb, var(--ae-warm) 12%, var(--ae-surface)); }
.activity-engine .ae-small-title { font-size: 1rem; line-height: 1.5; margin: 0 0 .55rem; color: var(--ae-text); }
.activity-engine .ae-material-list { margin: 0; padding-left: 1.2rem; line-height: 1.65; }
.activity-engine .ae-offline-step { display: flex; width: 100%; justify-content: start; gap: .9rem; text-align: left; padding: 1rem; font-weight: 550; }
.activity-engine .ae-reflection p { margin: 0; line-height: 1.65; }
.activity-engine .ae-feedback { margin-top: 1.4rem; padding: 1rem 1.2rem; min-height: 64px; border-radius: 18px; border: 1px solid var(--ae-line); color: var(--ae-muted); background: color-mix(in srgb, var(--ae-accent) 4%, var(--ae-surface)); line-height: 1.65; }
.activity-engine .ae-feedback--success { color: var(--ae-text); border-color: color-mix(in srgb, var(--ae-good) 65%, var(--ae-line)); background: color-mix(in srgb, var(--ae-good) 20%, var(--ae-surface)); }
.activity-engine .ae-feedback--retry { color: var(--ae-text); background: color-mix(in srgb, var(--ae-warm) 18%, var(--ae-surface)); }
.activity-engine .ae-solution { margin-top: 1.3rem; padding: 1.4rem; border: 1px solid var(--ae-accent); border-radius: 20px; background: color-mix(in srgb, var(--ae-accent) 6%, var(--ae-surface)); }
.activity-engine .ae-explanation { margin: 0 0 1rem; line-height: 1.7; }
.activity-engine .ae-solution-note { font-size: .9rem; color: var(--ae-muted); margin: 0 0 1rem; line-height: 1.6; }
.activity-engine .ae-error { border: 1px solid var(--ae-line); border-radius: 18px; padding: 1.4rem; color: var(--ae-text); background: var(--ae-surface); line-height: 1.65; }
@media (max-width: 520px) {
  .activity-engine .ae-card { min-height: 104px; padding: 1rem .7rem; }
  .activity-engine .ae-pairs { gap: .65rem; }
  .activity-engine .ae-pair-column .ae-card { min-height: 90px; font-size: .94rem; }
  .activity-engine .ae-step { flex-wrap: wrap; gap: .65rem; }
  .activity-engine .ae-step-text { flex-basis: calc(100% - 52px); }
  .activity-engine .ae-step-controls { margin-left: auto; }
  .activity-engine .ae-count-tray { gap: .4rem; padding: .7rem; }
  .activity-engine .ae-count-item { width: 56px; height: 56px; min-width: 48px; font-size: 1.7rem; }
  .activity-engine .ae-pattern { padding: .6rem; gap: .2rem; }
  .activity-engine .ae-pattern-chip { min-width: 46px; min-height: 54px; }
  .activity-engine .ae-spatial { gap: .4rem; }
  .activity-engine .ae-cell { border-radius: 13px; }
  .activity-engine .ae-solution { padding: 1rem; }
  .activity-engine .ae-primary { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .activity-engine *, .activity-engine *::before, .activity-engine *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .activity-engine .ae-button:not(:disabled):hover { transform: none; }
}
@media (forced-colors: active) {
  .activity-engine .ae-button.is-selected, .activity-engine .is-correct { outline: 3px solid Highlight; }
  .activity-engine .ae-button:disabled { opacity: 1; }
}

/* R62: generous interactive cards with no recurring motion or new game colors. */
@media screen {
  .activity-engine .ae-button { min-width: 48px; min-height: 48px; border-radius: 19px; font-weight: 550; transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease; }
  .activity-engine .ae-card { border-radius: 22px; gap: .8rem; }
  .activity-engine .ae-primary { border-radius: 16px; min-height: 50px; }
  .activity-engine .ae-instruction { line-height: 1.75; }
  .activity-engine .ae-count-tray { border-style: solid; padding: 1.4rem; }
  .activity-engine .ae-count-item { border-radius: 50%; }
  .activity-engine .ae-step { border-radius: 20px; padding: .9rem; }
  .activity-engine .ae-step-controls { gap: .4rem; }
  .activity-engine .ae-icon-button { width: 46px; min-width: 46px; min-height: 46px; height: 46px; border-radius: 14px; }
  .activity-engine .ae-materials, .activity-engine .ae-reflection, .activity-engine .ae-feedback, .activity-engine .ae-solution { border-radius: 22px; }
  html[data-theme=dark] .activity-engine .ae-primary { color: #221632; }
  html[data-theme=dark] .activity-engine .ae-primary:not(:disabled):hover { color: #221632; background: var(--accent-hover); }
}
@media screen and (max-width: 520px) {
  .activity-engine .ae-options { grid-template-columns: repeat(auto-fit, minmax(min(100%, 136px), 1fr)); gap: .7rem; }
  .activity-engine .ae-options--compact { grid-template-columns: repeat(auto-fit, minmax(min(100%, 64px), 1fr)); }
  .activity-engine .ae-card { min-height: 112px; padding: 1rem .75rem; }
  .activity-engine .ae-pair-column .ae-card { min-height: 98px; }
  .activity-engine .ae-count-tray { padding: .8rem; gap: .45rem; }
  .activity-engine .ae-count-item { width: 56px; height: 56px; }
  .activity-engine .ae-cell { min-width: 44px; border-radius: 15px; padding: .6rem; }
  .activity-engine .ae-step { padding: .8rem; }
  .activity-engine .ae-step-controls { width: 100%; justify-content: flex-end; padding-left: 44px; }
  .activity-engine .ae-pair-solution { gap: .5rem; padding: .9rem; }
  .activity-engine .ae-materials, .activity-engine .ae-reflection, .activity-engine .ae-feedback, .activity-engine .ae-solution { padding: 1rem; }
}
@media (hover: none) {
  .activity-engine .ae-button:not(:disabled):hover { transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .activity-engine *, .activity-engine *::before, .activity-engine *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}