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.target{background:var(--accent);color:white}.coordinate-note{display:flex;justify-content:space-between;max-width:390px;margin:0 auto 10px;font-size:12px}footer{padding:20px 0 30px;border-top:1px solid #cbd2c4;display:flex;justify-content:space-between;font-size:12px}.primary-link{display:inline-block;background:var(--accent);color:white;border-radius:10px;padding:16px;text-decoration:none}@media(max-width:760px){main{padding:0 16px}.top{padding:20px 16px;font-size:11px;letter-spacing:.5px}.intro{padding:35px 6px}.intro h1{letter-spacing:-3px}.intro-art{transform:scale(.65);transform-origin:center right;margin-right:0;width:160px}.intro p:not(.eyebrow){font-size:14px}.preferences{flex-wrap:wrap;gap:8px 18px;padding:12px}.preferences>span{margin-left:0}.preferences label{display:block}.preferences select{display:block;font-size:13px}.subjects{grid-template-columns:repeat(4,1fr)}.subjects button{padding:10px 3px;font-size:11px}.subjects button span{font-size:20px}.workspace{grid-template-columns:1fr}.lesson{padding:24px}.visual-wrap{border-left:0;border-top:1px solid #cbd2c4;padding:20px}.answer-area{grid-template-columns:1fr;padding:22px;gap:8px}.answer-row input{flex:1}.answer-area>button{justify-self:start}.notebook{grid-template-columns:1fr;gap:24px;padding:32px 5px}.number-journey strong{font-size:24px}footer{gap:20px;line-height:1.6}.intro-art{display:none}.coordinate-grid button{font-size:10px}.equation{font-size:38px}}@media(prefers-reduced-motion:no-preference){.group,.part-results .shown{animation:appear .3s ease-out}@keyframes appear{from{opacity:.5;transform:translateY(5px)}to{opacity:1;transform:none}}}

.place-value{display:inline-block;border:2px solid transparent;border-radius:5px;padding:2px}.active-place{border-color:var(--accent);background:var(--pale)}

/* Learning-focused layout: the activity owns the page; choices stay in the margin. */
.study-heading{display:flex;align-items:center;justify-content:space-between;padding:32px 0 24px;gap:20px}.study-heading h1{font:38px/1.15 Georgia,serif;margin:10px 0}.study-heading h1 em{color:var(--accent)}.study-toolbar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:20px}.study-toolbar p{font-size:13px}.levels{display:flex;gap:3px;border:1px solid #b9c6b4;border-radius:12px;padding:4px;background:#e9ede2}.levels button{padding:11px 24px;border:0;border-radius:8px;background:transparent;color:#233e36;font-size:14px}.levels button[aria-pressed=true]{background:#23654e;color:#fff;box-shadow:0 2px 4px #233e3620}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 155px;gap:20px;align-items:start}.study-main{min-width:0}.topic-panel{position:sticky;top:18px;border:1px solid #cbd2c4;border-radius:14px;background:#efefe7;overflow:hidden}.topic-panel summary{padding:16px 12px;font-size:12px;font-weight:700;cursor:pointer}.topic-panel summary>span{display:block;margin-top:8px;font-weight:400}.topic-panel .subjects{display:flex;flex-direction:column;margin:0;padding:0 8px 8px;gap:5px}.topic-panel .subjects button{display:flex;align-items:center;gap:12px;text-align:left;border-color:transparent;padding:10px;font-size:13px}.topic-panel .subjects button span{display:inline-block;margin:0;width:23px;font-size:22px}.topic-panel>p{font-size:11px;line-height:1.7;padding:0 14px 10px;color:#526157}.workspace{grid-template-columns:minmax(220px,.8fr) minmax(0,1.3fr)}.lesson{padding:24px}.lesson h2{font-size:28px}.lesson .equation{font-size:36px}.visual-wrap{padding:20px}.visual-heading{align-items:center;margin-bottom:10px;min-height:35px}.visual-heading .quiet{font-size:11px;letter-spacing:0}#manip-instruction{font-size:13px;line-height:1.65;margin:6px 0 12px}#manip-status{font-size:12px;line-height:1.5;margin-bottom:15px;font-weight:650;min-height:36px}.help-panel{border-top:1px solid #cbd2c4;border-bottom:1px solid #cbd2c4;padding:15px 0;margin-bottom:6px}.help-panel summary{font-size:13px;cursor:pointer}.help-panel .step-controls{margin-top:16px;gap:8px}.help-panel .step-controls button{padding:10px}.help-panel .explanation{padding:12px;min-height:0}.card-tray{border:1px dashed #8ca081;background:#fffef9;border-radius:12px;padding:12px;min-height:96px}.card-tray>b{font-size:12px}.card-list{display:flex;gap:6px;flex-wrap:wrap;min-height:24px;margin-top:10px}.card-list>span{font-size:11px;color:#526157}.move-card{border:1px solid #74896c;border-bottom:3px solid #74896c;border-radius:7px;background:#f6e2af;color:#233e36;min-width:44px;min-height:48px;padding:5px;touch-action:none;user-select:none}.move-card span{font-size:18px;font-weight:750}.move-card small{display:block;font-size:8px}.move-card.selected{outline:3px solid #23654e;outline-offset:2px;background:#fff}.hands-groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px}.drop-group{border:1px solid #9db290;background:#fffef9;border-radius:12px;padding:8px;min-height:100px}.drop-group.balanced{border:2px solid #23654e}.group-target{display:flex;justify-content:space-between;align-items:center;gap:8px;width:100%;min-height:38px;background:transparent;border:0;border-bottom:1px solid #d0d8c9;color:#233e36;font-size:11px;padding:3px}.group-target strong{font-size:21px}.drop-placeholder{padding:7px 0}.live-equation{font-size:13px;font-weight:750;line-height:1.8;overflow-wrap:anywhere}.drag-ghost{position:fixed;transform:translate(-50%,-50%);pointer-events:none;z-index:1000;border:2px solid #23654e;background:#f6e2af;border-radius:10px;padding:14px;font-size:22px;box-shadow:0 6px 18px #233e3633}.build-action{padding:13px 16px;border:1px solid #23654e;background:#fffef9;border-radius:9px;color:#233e36;font-weight:700;margin-top:15px;min-height:44px}.build-action:disabled{opacity:.5;cursor:default}.hop-actions{display:flex;gap:10px}.answer-area{grid-template-columns:1fr 1fr;padding:20px 24px;gap:10px 20px}.answer-area>#next{grid-column:1/-1;justify-self:end}.answer-row input{flex:1;max-width:190px}.notebook{padding-top:35px}.stats-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:20px 0}.stats-cards div{border:1px solid #cbd2c4;border-radius:9px;padding:12px}.stats-cards strong{display:block;font-size:26px}.stats-cards span{font-size:11px}.notebook label{display:block;font-size:12px;margin-bottom:8px}#garden{gap:10px}#garden .badge{width:95px;height:95px;display:flex;flex-direction:column;justify-content:center;text-align:center;background:transparent;opacity:.55;font-size:26px}#garden .badge.earned{background:#e2eddb;opacity:1;border:2px solid #23654e}#garden .badge small{font-size:10px;line-height:1.5;color:#233e36}#celebration{position:fixed;left:50%;top:45%;pointer-events:none;z-index:1200}#celebration i{position:absolute;width:7px;height:7px;border-radius:50%;animation:burst 1s ease-out forwards}@keyframes burst{0%{transform:translate(0,0) scale(.3);opacity:1}70%{opacity:1}100%{transform:translate(var(--dx),var(--dy)) scale(.2);opacity:0}}@media(max-width:1000px){.study-layout{grid-template-columns:minmax(0,1fr) 130px}.workspace{grid-template-columns:1fr}.visual-wrap{border-left:0;border-top:1px solid #cbd2c4}.lesson .equation{margin:15px 0}.lesson>p{margin:10px 0}.lesson{padding:22px}.answer-area{grid-template-columns:1fr}}@media(max-width:600px){.study-heading{padding:20px 0 12px;align-items:start}.study-heading h1{font-size:28px}.study-heading>.quiet{font-size:11px;white-space:nowrap}.study-layout{display:flex;flex-direction:column}.study-main{width:100%}.topic-panel{position:static;width:100%;order:2}.topic-panel .subjects{display:grid;grid-template-columns:repeat(2,1fr)}.topic-panel summary>span{display:inline;margin-left:12px}.topic-panel>p{display:none}.study-toolbar{align-items:start}.study-toolbar p{font-size:11px;margin-top:12px}.levels button{padding:10px 14px;font-size:12px}.visual-wrap{padding:16px}.notebook{padding-top:25px}.notebook .answer-row{flex-wrap:wrap}.stats-cards{gap:5px}.stats-cards div{padding:10px 7px}.study-heading .eyebrow{font-size:9px}.answer-area>#next{justify-self:start}}@media(prefers-reduced-motion:reduce){#celebration{display:none}}

.bank-target{border:0;background:transparent;color:#233e36;font-size:12px;font-weight:700;text-align:left;min-height:30px;padding:0}.fraction-work{margin-top:22px;font-size:13px}.fraction-pieces{display:flex;flex-wrap:wrap;gap:5px;margin:12px 0}.fraction-piece{background:#f6e2af;color:#233e36;border:1px solid #74896c;border-radius:5px;min-width:44px;min-height:44px;padding:8px;font-size:12px}.fraction-destination{border:1px dashed #74896c;border-radius:8px;padding:10px;background:#fffef9}.fraction-pieces>span{font-size:12px;line-height:1.6}.fraction-destination small{font-size:10px;letter-spacing:1px}

.card-bundle{display:inline-flex;flex-direction:column;gap:3px}.split-card{font-size:10px;min-height:28px;color:#233e36;background:#fffef9;border:1px solid #9cae94;border-radius:4px;padding:4px}.ten-card{background:repeating-linear-gradient(90deg,#f6e2af 0 4px,#e7ca84 4px 5px)}.hundred-card{background:#c9ddbd}.unit-card{background:#d1e0ed}.hands-groups .card-bundle .move-card{min-width:40px}.card-list{align-items:start}

#celebration>span{position:absolute;transform:translate(-50%,-50%);white-space:nowrap;padding:15px 24px;border-radius:12px;background:#23654e;color:white;box-shadow:0 5px 25px #233e362a;font-weight:700}@media(prefers-reduced-motion:reduce){#celebration{display:block}#celebration i{display:none}}