.act-root{font-size:1.05rem;line-height:1.6;color:#252541}.act-root *{box-sizing:border-box}.act-instruction{font-size:clamp(1.3rem,3vw,1.7rem);line-height:1.35;margin:12px 0 22px;max-width:43rem}.act-visual{background:#f6f6fb;border:1px solid #e3e2ee;border-radius:22px;padding:24px;margin:16px 0}.act-btn{font:inherit;line-height:1.3;font-weight:700;padding:12px 18px;min-height:46px;border:1.5px solid #ceccdf;border-radius:13px;background:#fff;color:#30294e;cursor:pointer}.act-btn:hover{background:#eeebfa;border-color:#71629b}.act-primary{background:#343052;color:white;border-color:#343052}.act-primary:hover{background:#514571;color:#fff}.act-root button:focus-visible,.act-root input:focus-visible,.act-root summary:focus-visible{outline:3px solid #6543b2;outline-offset:4px}.act-root button:disabled{opacity:.45;cursor:default}.act-root button[aria-pressed=true]{background:#dcd2f4;border-color:#695198;box-shadow:inset 0 0 0 1px #695198}.act-actions,.act-strategies{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:20px}.act-help{background:#f2edff;border-radius:16px;display:flex;gap:12px;align-items:flex-start;padding:14px 18px;margin:18px 0}.act-help>span{font-size:1.5rem;color:#5a4588}.act-help p{margin:0}.act-caption{font-size:.9rem;color:#57536f;margin:16px 0 0}.act-feedback{margin-top:18px;border-radius:16px;background:#fff4df;padding:0;overflow:hidden}.act-feedback:not(:empty){padding:18px 22px;border:1px solid #e5d6b3}.act-feedback p{margin:6px 0 0}.act-feedback.act-positive{background:#e5f5ee;border-color:#b4d6c6}.act-skill{font-size:.86rem;margin-top:26px;padding-top:16px;border-top:1px solid #dedce9;color:#57516d}.act-skill summary{font-weight:700;cursor:pointer;min-height:44px;display:flex;align-items:center;gap:8px}.act-skill summary:before{content:'+';font-size:1.2rem}.act-skill[open] summary:before{content:'−'}.act-skill p{margin:6px 0}.act-answer-label{display:block;font-weight:700;margin:18px 0 8px}.act-answer{font:inherit;font-size:1.4rem;background:#fff;color:#252541;border:2px solid #b9b3cd;border-radius:13px;padding:11px 16px;width:100%;max-width:220px;min-height:52px}.act-answer::placeholder{font-size:1rem;color:#81788e}.act-tokens{display:flex;flex-wrap:wrap;gap:9px;max-width:580px}.act-token{position:relative;display:inline-flex;align-items:center;justify-content:center;flex:0 0 46px;width:46px;height:46px;border:1.5px solid #a6c8b3;border-radius:14px;background:#d6efde;font:inherit;font-size:1.5rem;color:#285e46;cursor:pointer}.act-token:hover{border-color:#285e46}.act-token.act-selected{background:#f6e4af;border-color:#7c6434;color:#634b21;transform:translateY(-2px)}.act-token-check{position:absolute;right:1px;top:-7px;font-size:.8rem;font-weight:800}.act-small-tokens{display:flex;flex-wrap:wrap;gap:5px;max-width:190px;justify-content:center;padding:8px}.act-small-tokens i{width:15px;height:15px;border-radius:50%;background:#608d72;border:1px solid #36583e}.act-operation-parts{display:flex;align-items:center;justify-content:center;gap:18px;flex-wrap:wrap}.act-operation-parts section{max-width:340px;flex:1 1 150px;padding:14px;border:1px dashed #a2ad9d;border-radius:14px;background:#fff}.act-operation-parts section p{margin:0 0 12px;font-size:.9rem}.act-equation{font-size:clamp(2rem,7vw,3rem);font-weight:800;letter-spacing:.02em;text-align:center;padding:20px 5px}.act-equation span{color:#807195}.act-operation-select,.act-shape-choices{border:0;padding:0;margin:4px 0 18px;display:flex;flex-wrap:wrap;gap:9px}.act-operation-select legend,.act-shape-choices legend{font-size:.87rem;font-weight:700;margin-bottom:9px}.act-operation-select .act-btn{font-size:1.35rem;min-width:52px}.act-number-line{display:flex;width:100%;max-width:100%;overflow-x:auto;padding:16px 2px 20px;position:relative}.act-number-line:before{content:'';position:absolute;top:49px;left:14px;right:14px;border-top:3px solid #77708e;pointer-events:none}.act-tick{position:relative;display:flex;flex-direction:column;align-items:center;gap:4px;justify-content:center;min-width:52px;flex:1 0 0;padding:3px 5px;border:1px solid transparent;background:transparent;border-radius:11px;font:inherit;font-size:.9rem;font-weight:700;color:#3a3554;cursor:pointer;z-index:1}.act-tick>span{font-size:1.8rem;line-height:1;background:#f6f6fb;padding:0 2px}.act-tick.act-selected{background:#ded1f3;border-color:#765995}.act-tick.act-selected>span{background:#ded1f3}.act-abacus{display:flex;justify-content:center;gap:14px;flex-wrap:wrap}.act-abacus-column{display:flex;align-items:center;flex-direction:column;min-width:82px;flex:1 1 86px;max-width:130px}.act-abacus-column>strong{font-size:.77rem;text-align:center;min-height:2.5em;line-height:1.2}.act-abacus-column>small{font-size:.8rem}.act-rod{position:relative;display:flex;flex-direction:column-reverse;gap:4px;align-items:center;justify-content:flex-start;height:159px;width:70px;padding:10px 0}.act-rod:before{content:'';position:absolute;left:calc(50% - 2px);top:0;bottom:0;width:4px;background:#b8afc4;border-radius:3px}.act-rod i{z-index:1;display:block;width:42px;height:12px;border-radius:8px;background:#e7e2ee;border:1px solid #bbb1cd}.act-rod i.act-bead-on{background:#a999d3;border-color:#6d5b96}.act-counter{display:flex;align-items:center;justify-content:center;gap:6px}.act-counter .act-btn{min-width:36px;min-height:44px;padding:6px 11px;font-size:1.2rem}.act-counter output{font-weight:800;min-width:18px;text-align:center}.act-work-output{text-align:center;margin:18px 0 0}.act-work-output strong{font-size:1.3rem}.act-baskets,.act-groups{display:flex;flex-wrap:wrap;gap:12px;margin:16px 0}.act-basket{display:flex;flex-direction:column;align-items:center;justify-content:space-between;flex:1 1 95px;min-height:120px;border:2px solid #b29b78;border-radius:12px 12px 28px 28px;background:#f5e6d0;color:#493c2f;padding:12px 6px;font:inherit;cursor:pointer}.act-basket>span:first-child{font-size:.8rem;font-weight:700}.act-group{display:flex;flex-direction:column;align-items:center;flex:1 1 90px;max-width:150px;border:1px dashed #b9abc9;border-radius:14px;padding:7px;background:#fff}.act-group>span{font-size:.72rem}.act-decomposition{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}.act-decomposition>span{padding:18px;border-radius:13px;background:#e9e4f3;display:flex;flex-direction:column;text-align:center}.act-bridge{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:16px;margin:28px 0 8px}.act-bridge>span{min-width:90px;padding:15px;background:#fff;border-radius:14px;font-size:1.5rem;font-weight:800;text-align:center;border:2px solid #c8badf}.act-bridge small{display:block;font-size:.75rem;font-weight:500}.act-steps,.act-lesson-progress{display:flex;gap:8px;margin:12px 0;flex-wrap:wrap}.act-steps>span,.act-lesson-progress>span{font-size:.8rem;padding:6px 12px;background:#eeeaf5;border-radius:30px;color:#665d77}.act-steps>span.act-current,.act-lesson-progress>span.act-current{background:#4d3d70;color:white;font-weight:700}.act-step-instruction{font-weight:700;padding:14px 18px;border-left:4px solid #9b84c3;background:#f3effa;border-radius:0 12px 12px 0}.act-fraction-wrap{display:flex;align-items:center;gap:25px;max-width:600px;margin:0 auto}.act-fraction-symbol{font-size:2rem;font-weight:800;display:flex;flex-direction:column;align-items:center;min-width:50px}.act-fraction-symbol span:first-child{border-bottom:3px solid #4b3a68;width:100%;text-align:center}.act-fraction{display:grid;grid-template-columns:repeat(var(--parts),1fr);gap:2px;flex:1;border:3px solid #6d567d;padding:2px;background:#fff;border-radius:8px;overflow:hidden}.act-fraction-cell{border:1px solid #9e8bad;min-height:86px;min-width:36px;background:#f4edf9;color:#594269;cursor:pointer;font-size:1.5rem}.act-fraction-cell.act-selected{background:#d6b1dc;border-color:#6d467c}.act-money-display{max-width:390px;margin:0 auto;display:flex;flex-direction:column;align-items:center}.act-money-display>strong{font-size:2.3rem}.act-money-display>span{font-size:.8rem}.act-euro-bar{width:100%;height:36px;background:repeating-linear-gradient(90deg,#f0e5c9 0,#f0e5c9 calc(10% - 2px),#b49b6d calc(10% - 2px),#b49b6d 10%);border:2px solid #8b7449;border-radius:7px;overflow:hidden;margin:15px 0}.act-euro-bar>span{display:block;height:100%;background:#c19539;border-right:2px solid #5d4d2e;opacity:.85}.act-coins{display:flex;justify-content:center;gap:48px;margin:15px 0}.act-coins>div{display:flex;flex-direction:column;align-items:center;gap:10px}.act-coin{display:flex;flex-direction:column;align-items:center;justify-content:center;width:76px;height:76px;background:#f2d488;border:4px double #9e7936;border-radius:50%;font-size:1.6rem;font-weight:800;line-height:1.05;color:#664d22}.act-coin small{font-size:.7rem}.act-story-data{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}.act-story-data>span{padding:14px 24px;background:#e7e0f3;border-radius:13px;text-align:center;font-size:.8rem}.act-story-data b{display:block;font-size:1.8rem}.act-story-objects{background:#fff;padding:14px;border-radius:15px}.act-ribbons{display:flex;flex-direction:column;gap:20px}.act-ribbon-option{font:inherit;text-align:left;padding:16px;border:2px solid transparent;background:#fff;border-radius:12px;cursor:pointer;color:#383047}.act-ribbon-option>b{display:block;font-size:.85rem;margin-bottom:8px}.act-ribbon-option>span{display:block;height:32px;background:#c3a3d6;border:2px solid #826395;border-radius:0 6px 6px 0}.act-ribbon-option:last-child>span{background:#a4cdb5;border-color:#658c76}.act-ruler-area{padding:18px 3px}.act-measure-ribbon{height:38px;background:#d0b0df;border:2px solid #826395;border-radius:0 6px 6px 0;color:#51375f;min-width:32px}.act-measure-ribbon>span{display:block;text-align:center;font-size:.72rem;font-weight:700;line-height:34px}.act-ruler{display:flex;justify-content:space-between;width:100%;border-top:2px solid #7e704e;background:#faedc7;margin-top:6px;padding:0 0 7px;font-size:.76rem;color:#51452b}.act-ruler>span{display:flex;flex-direction:column;align-items:center;position:relative}.act-ruler i{height:14px;border-left:1.5px solid #7e704e}.act-range-label{display:block;margin:20px 0 7px;font-size:.9rem}.act-range{width:100%;min-height:44px;accent-color:#735493}.act-shape{display:block;max-width:420px;max-height:260px;width:100%;margin:auto;overflow:visible}.act-shape-fill>path,.act-shape-fill>rect,.act-shape-fill>circle{fill:#f1d88e;stroke:#78632f;stroke-width:3}.act-shape-fill text{font-size:15px;fill:#3e364b;stroke:none;fill-opacity:1}.act-shape-fill path.act-altitude{fill:none;stroke:#735a8e;stroke-dasharray:6 4;stroke-width:2}.act-side-counter{margin-top:14px;gap:14px;flex-wrap:wrap}.act-classification{display:flex;flex-wrap:wrap;gap:15px;justify-content:center}.act-classification .act-token{width:59px;height:59px;flex-basis:59px;color:#514671;background:#eee5fa;border-color:#b9a8d5}.act-bars{height:200px;display:flex;align-items:flex-end;justify-content:center;gap:30px}.act-bars>div{display:flex;flex-direction:column;align-items:center;width:85px}.act-bars strong{font-size:.95rem}.act-bars b{font-size:.85rem;font-weight:600}.act-bars span{width:58px;border:2px solid #6c647e;border-radius:8px 8px 0 0;max-height:135px;min-height:20px}.act-bar-0{background:#b8d7bf}.act-bar-1{background:#e5c982}.act-bar-2{background:#c7b5dd}.act-chart{margin:0}.act-chart figcaption{font-size:.8rem;text-align:center;margin:10px 0 18px}.act-data-table{border-collapse:collapse;max-width:340px;width:100%;margin:0 auto;background:#fff;font-size:.86rem}.act-data-table caption{text-align:left;font-size:.8rem;margin-bottom:6px}.act-data-table td,.act-data-table th{text-align:left;border-bottom:1px solid #ddd7e6;padding:7px 12px}.act-data-table thead{background:#e7e1f0}.act-data-table tbody th{font-weight:500}.act-lesson-example{display:flex;align-items:center;justify-content:center;gap:24px;margin:30px 0}.act-lesson-example>div{display:flex;flex-direction:column;align-items:center;border:1px dashed #95b09b;background:#f1f9f2;padding:15px;border-radius:14px;min-width:100px}.act-lesson-example>div b{font-size:1.3rem}.act-success-note{padding:22px;background:#e5f4eb;border:1px solid #b6d4c2;border-radius:20px;margin:18px 0}.act-success-note>span{font-size:2rem;color:#4b7b5c}.act-success-note h4{font-size:1.3rem;margin:2px 0 10px}.act-success-note p{margin:8px 0}
@media(max-width:600px){.act-root{font-size:1rem}.act-visual{padding:17px 12px;border-radius:16px}.act-instruction{margin-bottom:16px}.act-number-line{padding-bottom:18px}.act-tick{min-width:45px;font-size:.78rem}.act-abacus{gap:8px}.act-abacus-column{min-width:72px;flex-basis:72px}.act-counter{gap:4px}.act-counter .act-btn{min-width:32px;padding:6px 9px}.act-fraction-wrap{gap:12px}.act-fraction-symbol{min-width:35px;font-size:1.6rem}.act-fraction-cell{min-height:65px;min-width:28px}.act-operation-parts{gap:12px}.act-operation-parts section{padding:10px}.act-token{width:44px;height:44px;flex-basis:44px}.act-tokens{gap:8px}.act-btn{padding:11px 14px;font-size:.93rem}.act-bars{gap:18px}.act-bars>div{width:64px}.act-bars span{width:48px}.act-coins{gap:32px}.act-lesson-example{gap:14px}.act-lesson-example>div{min-width:80px;padding:10px}.act-actions{gap:8px}.act-steps>span,.act-lesson-progress>span{font-size:.74rem;padding:5px 9px}.act-ruler{font-size:.68rem}}
@media(prefers-reduced-motion:reduce){.act-root *{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
.act-counter .act-btn{min-width:44px;min-height:44px}.act-abacus-column{min-width:120px;flex-basis:120px}.act-feedback:focus{outline:3px solid #6543b2;outline-offset:4px}.act-instruction:focus{outline:3px solid #6543b2;outline-offset:5px;border-radius:6px}.act-fraction-cell{min-width:44px}
@media(max-width:600px){.act-counter .act-btn{min-width:44px;min-height:44px}.act-abacus-column{min-width:120px;flex-basis:120px}.act-fraction-wrap{flex-direction:column;gap:14px}.act-fraction-symbol{min-width:45px}.act-fraction{width:100%;flex:auto}.act-btn{font-size:1rem}}

/* Keep mathematical widgets inside the dialog without shrinking touch targets. */
.act-scroll-note{display:none;font-size:1rem;color:#57536f;margin:0 0 14px}
@media(max-width:800px){.act-scroll-note{display:block}}
.act-root,.act-visual,.act-root fieldset,.act-operation-parts>section,
.act-help>p,.act-coins>div,.act-story-data>span,.act-lesson-example>div{min-width:0;max-width:100%}
.act-root{overflow-wrap:break-word}
.act-root button{max-width:100%;white-space:normal}
.act-actions,.act-strategies{min-width:0}
.act-number-line{min-width:0;overscroll-behavior-x:contain;scrollbar-width:thin}
.act-fraction-wrap{min-width:0;width:100%}
.act-fraction{min-width:0;grid-template-columns:repeat(var(--parts),minmax(44px,1fr));gap:0;padding:0;border-width:2px}
.act-fraction-cell{min-width:44px}
.act-data-table{table-layout:fixed;width:100%;max-width:340px}
.act-data-table td,.act-data-table th{min-width:0;width:auto;overflow-wrap:anywhere;font-size:1rem}
.act-data-table caption{font-size:1rem}
.act-chart,.act-bars{min-width:0;max-width:100%}
.act-bars{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(8px,3vw,24px);align-items:end}
.act-bars>div{width:auto;min-width:0}
.act-bars span{width:min(58px,100%)}
.act-bars b{font-size:1rem;max-width:100%;overflow-wrap:break-word}
.act-abacus-column>strong{font-size:1rem;min-height:3.6em;display:flex;align-items:center;justify-content:center}
.act-abacus-column>small{font-size:.9rem}
.act-lesson-example{gap:clamp(8px,3vw,24px)}
.act-lesson-example>div{flex:1 1 0;max-width:190px}
.act-lesson-example>strong{flex-shrink:0}
@media(max-width:600px){
  .act-tick{font-size:1rem;min-width:4.25em;flex:1 0 4.25em}
  .act-help{padding:14px 12px;gap:9px}
  .act-feedback:not(:empty){padding:16px 14px}
  .act-data-table td,.act-data-table th{padding:9px 8px}
  .act-fraction-wrap{flex-direction:column;align-items:stretch}
  .act-fraction-symbol{align-self:center}
}