:root{--ink:#233f38;--green:#236b55;--mint:#eaf3ea;--bg:#f8f9f5;--muted:#75827a;--line:#e5e9df;--yellow:#f5cf72;--orange:#d68e57}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:"Segoe UI",Arial,sans-serif;font-size:15px;line-height:1.55}button,input,select{font:inherit}a{color:inherit;text-decoration:none}button,a,select,input{ -webkit-tap-highlight-color:transparent}button,a,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}:focus-visible{outline:3px solid #e6ad43;outline-offset:4px}.skip{position:absolute;left:260px;top:-60px;z-index:10;background:white;padding:12px}.skip:focus{top:5px}.sidebar{position:fixed;width:238px;inset:0 auto 0 0;background:#fff;border-right:1px solid var(--line);padding:32px 23px;display:flex;flex-direction:column;z-index:5}.brand{display:flex;align-items:center;gap:10px;font-size:24px;font-weight:750;letter-spacing:-1px;line-height:1.2}.brand-green{color:#3d8765}.brand 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p{font-size:14px;margin:0}.operation{font-size:38px;letter-spacing:1px;font-weight:650;margin:20px 0;text-align:center}.choices{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.choice{padding:16px;border-radius:10px;border:1px solid #d8e2d0;background:#fafcf7;color:var(--ink);font-size:24px;font-weight:600}.choice:hover{background:#eaf2e1}.feedback{min-height:52px;margin:16px 0;font-size:14px;padding:12px;border-radius:8px}.feedback.good{background:#e9f3e5;color:#35683c}.feedback.retry{background:#faf0de;color:#896933}.objects{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;font-size:29px;min-height:50px;margin:15px 0}.track{height:7px;background:#e6eadf;border-radius:10px;overflow:hidden;margin:15px 0}.track i{display:block;height:100%;background:#7d9c68;border-radius:10px}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.tabs button{border-radius:20px;padding:8px 14px;border:1px solid var(--line);background:#fff;color:#78906c;font-size:12px}.tabs 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a{text-decoration:underline;text-underline-offset:3px}#toast{position:fixed;bottom:22px;right:25px;padding:12px 20px;border-radius:10px;background:#294e3d;color:white;max-width:calc(100% - 50px);z-index:10;display:none}#toast.show{display:block}.privacy p{font-size:13px;color:#78856f}.privacy h3{margin-top:24px}.badge{display:inline-block;padding:15px 20px;background:#f6f2df;color:#967b39;border-radius:12px;font-size:13px;margin:7px}#banner-slot{margin:12px 42px;padding:12px;min-height:110px;border:1px solid var(--line);border-radius:8px}#banner-slot[hidden]{display:none}.expression{padding:12px;background:#f2f5ed;border-radius:8px;font-size:13px;margin:12px 0}.streak-note{font-size:11px;color:#8a9480}.done{color:#477953;font-weight:650}.lesson-view .panel{margin-bottom:20px}@media(min-width:1500px){main{padding-top:45px}.hero{min-height:280px;padding:38px}.hero h2{font-size:40px;max-width:440px}.hero-art .mini-abacus{transform:rotate(-9deg) scale(1.15)}}@media(max-width:1150px){.sidebar{width:210px;padding:28px 17px}.shell{margin-left:210px}header{padding:0 25px}main{padding:27px 25px}.hero{padding:25px}.hero h2{font-size:29px}.hero-art .mini-abacus{width:210px;transform:rotate(-9deg) scale(.9)}.float.one{left:-5px}.cards{gap:10px}.lesson-card{padding:17px}.stat{padding:14px 12px;gap:10px}.workspace{grid-template-columns:1fr}.abacus-wrap{max-width:520px}footer{padding-left:25px;padding-right:25px}}@media(max-width:760px){.sidebar{position:static;width:auto;padding:18px 18px 10px;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:23px}.brand small{font-size:6.5px}.nav-label,.sidebar-bottom{display:none}nav{display:flex;overflow-x:auto;margin-top:17px;gap:4px;padding-bottom:4px}nav a{flex-shrink:0;font-size:11px;padding:9px 11px;gap:6px}nav a span{font-size:17px;width:16px}.shell{margin:0}header{height:66px;padding:0 18px}.age-label{display:none}.header-right{gap:8px}.avatar{width:30px;height:30px;font-size:18px}main{padding:23px 18px}.breadcrumb{font-size:11px}.breadcrumb span{margin:0 6px}h1{font-size:25px}.hero{grid-template-columns:1fr;padding:25px;min-height:0}.hero h2{font-size:32px;max-width:300px}.hero-art{height:175px;margin-top:26px}.hero-art .mini-abacus{width:235px;transform:rotate(-7deg) scale(.95)}.float.one{left:8px;top:4px}.float.two{right:8px}.spark{right:26px}.stats{gap:7px;margin-bottom:22px}.stat{display:block;padding:12px}.stat-icon{width:29px;height:29px;font-size:17px;margin-bottom:9px}.stat strong{font-size:18px}.stat small{font-size:9px}.cards{grid-template-columns:1fr}.lesson-card{min-height:0;padding:20px}.lesson-card p{font-size:12px}.lesson-card .btn{align-self:flex-start}.practice-teaser{align-items:flex-start;flex-direction:column;padding:18px}.section-top{align-items:flex-start}.section-top h2{font-size:18px}.panel{padding:20px}.abacus{padding:0 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[hidden]{display:none!important}@media(max-width:760px){.abacus{height:281px}}
.bead:disabled{opacity:1}.control-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.control-grid .field{min-width:0}.control-grid select{width:100%}
@media(max-width:480px){.control-grid{grid-template-columns:1fr}}
.coach-panel{background:#f0f5e9;border:1px solid #d7e3cc;border-radius:10px;padding:15px;margin:14px 0}.coach-panel h3{font-size:14px}.coach-panel .muted{font-size:11px;margin-bottom:10px}#coach-step{font-size:13px;font-weight:600;line-height:1.7}#coach-result{font-size:11px;color:#6c825d;margin:8px 0 12px}.rod.coach-target{background:#fff4cc66;box-shadow:inset 0 0 0 2px #b09c5180;border-radius:6px}
/* Quiet classroom layout */
.sidebar{width:198px;padding:23px 17px}.brand{font-size:21px;gap:8px}.brand-icon{width:31px;height:35px;font-size:34px;border-radius:9px}nav{margin-top:28px;gap:4px}nav a{font-size:12px;padding:10px}.sidebar-bottom{padding-top:16px}.shell{margin-left:198px}header{height:46px;padding:0 25px}.breadcrumb{display:none}.header-right{margin-left:auto;gap:10px}.age-label{font-size:11px}header select{padding:5px 24px 5px 10px}main{padding:18px 25px 24px;max-width:1600px}h1{font-size:19px;letter-spacing:-.25px;margin:0 0 15px;line-height:1.3}h2{font-size:16px}h3{font-size:14px}.panel{padding:18px}.workspace{gap:18px}.section-top{margin:15px 0 12px}.section-top p,.lesson-card p{display:none}.lesson-card{min-height:130px;padding:17px}.lesson-card h3{margin:10px 0;font-size:14px}.lesson-card .card-ico{display:none}.quick-start{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:24px}.quick-start .panel{padding:23px 18px}.quick-start h2{margin-bottom:5px}.quick-start span{font-size:12px;color:#76856e}.quick-start a:hover{border-color:#9db48d}.control-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.field{margin-bottom:8px;font-size:11px;gap:4px}.control-grid select{font-size:12px;padding:7px 24px 7px 10px}.operation{font-size:34px;margin:12px 0 18px}.track{margin:8px 0 12px}.coach-panel{padding:12px;margin:8px 0 12px;background:#f5f7f0}.coach-panel h3{font-size:12px;font-weight:500;color:#6a7c60;margin-bottom:6px}#coach-step{font-size:12px;line-height:1.65}#coach-result{font-size:10px;margin:6px 0 9px}.abacus-toolbar{display:flex;justify-content:flex-end;margin:0 0 10px}.abacus-wrap{margin-top:10px}.legend{display:none}.number-readout{margin:11px 0 0;font-size:35px}.equivalence{margin-bottom:10px;font-size:12px}.demo-step{margin:10px 0;padding:8px 0 8px 12px}.demo-step p{font-size:13px}.tabs{margin:12px 0}.expression{margin:10px 0 0}.feedback{min-height:0}.feedback:empty{padding:0;margin:8px 0}.btn{gap:9px}footer{padding:10px 25px 16px;justify-content:flex-end}#banner-slot{margin:10px 25px}.privacy h3{margin-top:18px}.parent-link{padding-top:12px}
/* Move the original board into an uncluttered presentation surface. */
body.focus-active{overflow:hidden}#focus-view{position:fixed;inset:0;z-index:50;display:flex;flex-direction:column;background:#f7f9f3;color:var(--ink);padding:12px 20px;gap:8px;width:100%;height:100dvh;overflow:hidden}#focus-view:fullscreen{background:#f7f9f3}.focus-header{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-shrink:0;min-height:40px}#focus-title{font-size:14px;font-weight:500;color:#6d7f61;max-width:30%}.focus-window-actions{display:flex;gap:8px}.focus-stage{position:relative;flex:1;min-height:90px;display:grid;place-items:center;overflow:hidden}.focus-stage .abacus-wrap{position:absolute;top:50%;left:50%;width:510px;max-width:none;margin:0;transform:translate(-50%,-50%) scale(var(--board-scale,1));transform-origin:center center}.focus-stage .abacus{height:281px}.focus-stage .number-readout{font-size:36px;margin:10px 0 0}.focus-stage .equivalence{font-size:12px;margin-bottom:0}.focus-stage .rod-labels{padding-top:13px}.focus-tools{display:flex;justify-content:center;align-items:flex-end;gap:10px;flex-wrap:wrap;flex-shrink:0}.focus-tools:empty,.focus-note:empty,#focus-banner:empty,#focus-question:empty,#focus-status:empty{display:none}.focus-tools .field{min-width:120px;max-width:300px;margin:0}.focus-tools .field select{width:100%;font-size:12px}.focus-tools .field input{padding:7px 10px}.focus-tools .btn-row,.focus-tools .tabs{margin:0;gap:8px}.focus-tools .tabs button{padding:7px 11px}.focus-note{flex-shrink:0;text-align:center;max-width:1050px;width:100%;margin:0 auto}.focus-note .demo-step{border:0;padding:2px 0;margin:0}.focus-note .demo-step b{display:none}.focus-note .demo-step p{font-size:14px;line-height:1.5;margin:0}.focus-note .coach-panel{border:0;background:transparent;margin:0;padding:0}.focus-note .coach-panel h3,.focus-note #coach-result{display:none}.focus-note #coach-step{font-size:14px;line-height:1.5}.focus-note .coach-panel .btn-row{justify-content:center;margin-top:8px}.focus-note .feedback{padding:5px;margin:4px 0 0;font-size:12px}.focus-note .feedback:empty{display:none}.focus-tools .choices{display:flex;gap:10px}.focus-tools .choice{padding:8px 25px;min-width:75px;font-size:22px}.focus-header .operation{font-size:24px;margin:0}.focus-header .btn{min-height:34px;padding:7px 12px;font-size:12px}#focus-status{text-align:center;font-size:11px;flex-shrink:0;color:#7c805e}#focus-banner #banner-slot{margin:0;min-height:90px}
@media(max-width:1150px){.control-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.workspace{grid-template-columns:1fr}.quick-start{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.sidebar{position:static;width:auto;padding:13px 14px 7px}.brand{font-size:19px}.brand-icon{width:27px;height:30px;font-size:30px}nav{margin-top:10px;padding-bottom:0;gap:3px}nav a{font-size:11px;padding:7px 9px}.shell{margin:0}header{height:38px;padding:0 14px}.age-label{display:block;font-size:10px}main{padding:13px 14px 20px}h1{font-size:17px;margin-bottom:12px}.panel{padding:14px}.workspace{gap:13px}.quick-start{gap:9px;margin-bottom:17px}.quick-start .panel{padding:17px 14px}.quick-start h2{font-size:15px}.quick-start span{font-size:11px}.control-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.control-grid select{font-size:11px;padding:7px 23px 7px 8px}.field{font-size:10px}.btn{min-height:38px;font-size:11px}.section-top h2{font-size:15px}.lesson-card{min-height:0}.lesson-card h3{font-size:14px;margin:8px 0}.lesson-card .text-link{margin-top:10px}.cards{gap:10px}.abacus-toolbar{margin-bottom:8px}.abacus-wrap{margin-top:8px}.operation{font-size:28px}.number-readout{font-size:32px}footer{padding:8px 14px 14px}#focus-view{padding:9px 10px;gap:6px}.focus-header{gap:7px;flex-wrap:wrap}.focus-window-actions{margin-left:auto;gap:6px}#focus-title{font-size:11px;max-width:45%}.focus-header .btn{font-size:10px;min-height:34px;padding:7px 9px}.focus-header .operation{font-size:18px}.focus-tools{gap:7px}.focus-tools .field{max-width:180px}.focus-tools .field select{font-size:11px}.focus-tools .btn{padding:7px 10px}.focus-note .demo-step p,.focus-note #coach-step{font-size:12px;line-height:1.5}.focus-note .coach-panel .btn-row{gap:6px;margin-top:7px}.focus-note .feedback{font-size:11px}.focus-tools .choices{gap:8px}.focus-tools .choice{min-width:55px;padding:7px 18px;font-size:20px}}
@media(max-height:520px){#focus-view{padding:5px 10px;gap:4px}.focus-header{min-height:30px}.focus-header .btn,.focus-tools .btn,.focus-note .btn{min-height:29px;padding:5px 9px;font-size:10px}.focus-note #coach-step,.focus-note .demo-step p{font-size:11px}.focus-note .coach-panel .btn-row{margin-top:4px}.focus-tools .tabs button{padding:4px 8px;font-size:10px}.focus-tools .field{gap:1px}.focus-tools .field input{padding:4px 8px}.focus-tools .field select{padding:4px 24px 4px 8px}.focus-note .feedback{font-size:10px}.focus-stage{min-height:50px}}
.page-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.page-heading h1{margin:0}.page-heading>.btn{font-size:11px;padding:7px 12px;flex-shrink:0}@media(max-width:760px){.page-heading{gap:8px}.page-heading>.btn{font-size:10px;padding:7px 9px;min-height:34px}}
/* Two-hand number practice: native SVG fingers open and fold in place. */
.finger-settings{display:flex;gap:12px;align-items:flex-end;flex-wrap:wrap;margin-bottom:12px}.finger-settings .field{min-width:130px;margin:0}.finger-modes{margin:0 auto 0 0;gap:6px}.finger-modes button{border-radius:8px;padding:8px 13px;font-size:12px}.finger-prompt{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:14px auto 4px;max-width:780px}.finger-prompt h2{font-size:20px}.finger-prompt>span{font-size:12px;color:#7c8874}.hands-container{position:relative;max-width:780px;margin:auto}.hands-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:30px;max-width:620px;margin:auto;min-height:270px}.finger-hand{min-width:0;text-align:center}.hand-svg{display:block;width:100%;max-width:250px;margin:0 auto;overflow:visible}.hand-palm,.finger-digit path,.digit-fold rect{fill:#efd0aa;stroke:#8f7153;stroke-width:2.6;stroke-linejoin:round;stroke-linecap:round}.hand-palm{fill:#f1d6b4}.finger-digit{cursor:pointer;outline-offset:3px}.finger-digit .nail{fill:#fff6e7;stroke:#c3a17c;stroke-width:1.4;opacity:.85}.finger-digit .knuckle,.palm-line{fill:none;stroke:#c1a07b;stroke-width:1.8;stroke-linecap:round}.finger-digit .finger-hit{fill:transparent;stroke:none}.digit-open{transition:transform .23s ease,opacity .18s ease;opacity:1}.digit-fold{opacity:0;transition:opacity .18s ease;pointer-events:none}.finger-digit.folded .digit-open{transform:scaleY(.24);opacity:0}.finger-digit.folded .digit-fold{opacity:1}.thumb.folded .digit-open{transform:rotate(35deg) scale(.4);opacity:0}.finger-digit[aria-disabled="true"]{cursor:default}.finger-digit:focus-visible .digit-fold rect,.finger-digit:focus-visible .digit-open path{stroke:#285e4d;stroke-width:5}.finger-hand-label{display:flex;justify-content:center;gap:8px;font-size:11px;color:#7c8874;margin:0}.finger-hand-label b{font-size:13px;color:#476144}.finger-readout{text-align:center;font-size:27px;font-weight:650;min-height:42px;letter-spacing:1px;margin:8px 0 12px}.finger-readout:empty{display:none}.finger-controls{display:flex;flex-direction:column;align-items:center;gap:14px}.finger-number-buttons{display:flex;justify-content:center;flex-wrap:wrap;gap:7px;max-width:650px}.finger-number-buttons .btn{min-width:42px;padding:9px 13px;font-size:16px}.finger-controls .btn-row{justify-content:center}.finger-choices{width:100%;max-width:340px}.finger-controls .choice{padding:12px 20px}.finger-next{text-align:center}.finger-rule{text-align:center;color:#839078;font-size:11px;margin:18px 0 0}#finger-feedback{text-align:center;max-width:650px;margin:15px auto}#finger-feedback:empty{margin:0}.finger-memory-cover{position:absolute;inset:0;display:grid;place-items:center;border:1px dashed #ccd5c2;border-radius:14px;background:#f7f9f3;color:#6c7e60;font-size:23px}.hands-pair.concealed .finger-hand{visibility:hidden}.finger-summary{font-size:17px;text-align:center;color:#526b46}.quick-start{grid-template-columns:repeat(5,minmax(0,1fr))}
@media(max-width:1150px){.quick-start{grid-template-columns:repeat(3,minmax(0,1fr))}.finger-settings .finger-modes{width:100%}}
@media(max-width:760px){.quick-start{grid-template-columns:repeat(2,minmax(0,1fr))}.finger-settings{gap:8px;margin-bottom:10px}.finger-settings .field{flex:1;min-width:110px;font-size:10px}.finger-settings .field select{font-size:11px;padding:7px 22px 7px 8px}.finger-modes{gap:5px}.finger-modes button{font-size:11px;padding:8px 10px}.finger-prompt{margin-top:12px}.finger-prompt h2{font-size:17px}.hands-pair{gap:8px;min-height:0}.hand-svg{max-width:210px}.finger-readout{font-size:23px;margin:5px 0 12px;min-height:32px}.finger-number-buttons{gap:5px}.finger-number-buttons .btn{min-width:40px;min-height:40px;font-size:16px;padding:7px 9px}.finger-controls{gap:10px}.finger-rule{font-size:10px;margin-top:12px}.finger-hand-label{font-size:10px}.finger-settings .finger-exercise-only,.finger-settings .finger-memory-only{min-width:90px}.finger-memory-cover{font-size:20px}}
@media(prefers-reduced-motion:reduce){.digit-open,.digit-fold{transition:none}}