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p{margin:0;color:#28503d;font-weight:760}.frame-model{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:16px}.ten-frame{display:grid;grid-template-columns:repeat(5,28px);gap:4px;padding:6px;background:#e1c696;border-radius:8px;box-shadow:inset 0 2px 5px #6743263b}.ten-frame span{width:28px;height:28px;border:1px solid #ae8b57;border-radius:5px}.count-empty-hint{padding-inline:8px}.touch-frame{width:fit-content;grid-template-columns:repeat(5,44px);grid-auto-rows:44px;align-items:center;justify-items:center}.touch-frame button{width:44px;min-height:44px;padding:0;border:1px dashed #735127;border-radius:5px;background:#fff8e8;font-weight:850}.touch-frame button[aria-pressed=true]{background:#e1ecdf;border-style:solid}.touch-frame button[data-spoken=true]{background:#ffe4a0}.fill-ten{margin-block:12px}.fill-ten .filled-ten-cell{display:grid;place-items:center}.fill-ten-result{min-height:1.6em;margin-top:10px}.first-ten-frame .counter[data-spoken=true]{outline:2px solid #825218;outline-offset:2px}.first-ten .count-equation{margin-bottom:12px}.first-ten-places{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));max-width:380px;gap:8px;margin:12px 0}.first-ten-places>div{display:grid;grid-template-rows:auto 38px auto;align-items:center;justify-items:center;padding:6px;border:1px solid var(--line);border-radius:8px;background:#f5ead4;text-align:center}.first-ten-places b{color:var(--deep-teal);font:850 2.65rem/1 Nunito,sans-serif}.first-ten-places[data-spoken=true] b{background:#ffe4a0;border-radius:5px}.first-ten-stick{display:flex;width:min(100%,145px);min-height:15px;border:1px solid #8e5d2f;background:linear-gradient(#e5c18b,#bd8648)}.first-ten-stick i{flex:1;border-inline-end:1px solid #8e5d2f}.first-ten-stick i:last-child{border:0}.first-ten-units{display:flex;gap:5px}.neighbour-track{position:relative;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:4px;max-width:430px;margin-block:16px;padding:6px 0}.neighbour-track:before{content:"";position:absolute;left:8%;right:8%;top:50%;height:2px;background:#a9814a}.neighbour-track span{position:relative;justify-self:center;display:grid;place-items:center;min-width:36px;min-height:42px;border:1px solid var(--line);border-radius:7px;background:var(--white-paper);font:850 1.3rem/1 Nunito,sans-serif}.neighbour-track [data-start=true]{border-color:#a9814a}.neighbour-track [data-current=true]{color:#fff;background:var(--teal);border-color:var(--teal)}.neighbour-track span.spoken-highlight{color:#362605;background:#ffe4a0}.neighbour-demo button[aria-pressed=true]{border-color:var(--teal);background:#e1ead8}.neighbour-result{min-height:3em;margin-top:10px}.neighbour-result strong{display:block;color:var(--deep-teal);font-size:1.45rem}.first-ten-places [data-place-spoken=true]{background:#ffe4a0}.counter,.ten-frame .counter{width:28px;height:28px;background:#2f675b url(../art/token.webp) center/contain no-repeat;border-radius:50%;border:1px solid #305c48;box-shadow:0 2px 3px #492e2540}.counter.moved{background:linear-gradient(#d3a764,#aa7841);border-color:#926332;animation:place-step .22s ease-out}.loose-tokens{display:flex;flex-wrap:wrap;gap:4px;max-width:165px}.loose-tokens[data-labelled=true]>span:first-child{flex-basis:100%;font-weight:700}.loose-tokens[data-spoken=true] .counter{outline:2px solid #6b481c;outline-offset:1px}.bridge-sum .frame-model{display:grid;grid-template-columns:max-content minmax(0,1fr);gap:6px 12px}.bridge-sum .frame-model>.frame-count{grid-area:2 / 1}.bridge-sum .loose-tokens{grid-area:1 / 2 / 3 / 3}.bridge-sum>.frame-count{margin-top:10px}.ten-frame[data-spoken=true]{background:#ffe4a0;outline:2px solid #a56b27;outline-offset:2px}.ten-frame .counter[data-new=true]{outline:2px solid #6b481c;outline-offset:1px}.ten-frame span[data-gap=true]:not(.counter){background:#fff8e8;border:1px dashed #735127}.ten-frame span[data-gap-spoken=true]{outline:2px solid #6b481c;outline-offset:1px}.frame-count{display:flex;align-items:center;gap:8px;color:var(--deep-teal)}.frame-count strong{min-width:1em;text-align:center;font:850 2.25rem/1.1 Nunito,sans-serif}.number-line{max-width:540px;margin-top:14px}.number-line-steps{display:flex;gap:8px;margin-bottom:6px}.number-line-steps span{padding:2px 9px;border-radius:5px;background:#dcece2;color:var(--deep-teal);font-weight:800}.number-line-steps span:nth-child(2){background:#f3dfb8;color:#673e1b}.number-track{position:relative;height:100px;margin-inline:21px}.number-track:before{position:absolute;top:44px;left:-9px;right:-9px;height:3px;content:"";background:var(--brass);border-radius:2px}.mark{position:absolute;transform:translate(-50%);top:calc(51px + var(--mark-row) * 23px);font-weight:850;font-size:.92rem;line-height:1.2}.mark:before{content:"";position:absolute;left:calc(50% - 1px);bottom:100%;height:calc(7px + var(--mark-row) * 23px);width:2px;background:var(--brass)}.jump{position:absolute;bottom:56px;height:calc(38px - var(--jump-row) * 17px);color:var(--teal);border:2px solid currentColor;border-bottom:0;border-radius:50% 50% 0 0}.jump.second-jump{color:#8a521f}.jump:after{content:"";position:absolute;right:-4px;bottom:1px;width:7px;height:7px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg)}.jump.backward:after{right:auto;left:-4px}.place-blocks{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.7fr);align-items:start;gap:12px;width:min(100%,310px);margin-top:15px}.place-part{display:grid;gap:5px;align-content:start;min-width:0}.place-label{display:flex;flex-wrap:wrap;gap:0 5px;align-items:baseline;color:#594020;font-size:.8rem;line-height:1.2;font-weight:700}.place-label b{color:var(--ink);font-size:.95rem}.rails{display:flex;align-items:end;flex-wrap:wrap;gap:4px;min-height:56px}.ten-bar{display:block;width:9px;height:56px;border-radius:2px;background:repeating-linear-gradient(#e2bb81 0,#e2bb81 4.6px,#967044 4.6px,#967044 5.6px);box-shadow:1px 2px 3px #76533537}.units{display:grid;grid-template-columns:repeat(3,10px);gap:3px}.units span,.exchange-units span,.transfer-cube{display:block;width:10px;height:10px;background:#e1bb83;border:1px solid #99713f;border-radius:2px}.units .marked-unit,.transfer-cube,.exchange-units .transfer-cube{background:#3c7769;border-color:#214c43}.transfer-model{display:grid;gap:8px;width:min(100%,530px);margin-top:14px}.transfer-quantities{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.transfer-quantity{padding:8px;background:#f4e9d4;border:1px solid #e3d2ae;border-radius:8px}.transfer-label{display:block;color:#594020;font-size:.78rem;font-weight:700;line-height:1.2}.transfer-quantity strong{display:block;color:var(--deep-teal);font-size:1.45rem;line-height:1.15}.transfer-quantity .place-blocks{margin-top:5px;gap:4px 8px}.transfer-movement,.transfer-exchange{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;min-width:0;color:var(--deep-teal);font-size:.89rem;font-weight:780}.transfer-cubes,.exchange-units{display:flex;flex-wrap:wrap;align-items:center;gap:3px}.transfer-cubes{flex-direction:row-reverse}.transfer-arrow{position:relative;width:16px;height:2px;margin-right:2px;background:currentColor}.transfer-arrow:before{content:"";position:absolute;left:0;top:-3px;width:8px;height:8px;border-left:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg)}.exchange-rail{width:56px;height:9px;background:repeating-linear-gradient(90deg,#e2bb81 0,#e2bb81 4.6px,#967044 4.6px,#967044 5.6px)}.carry-model{display:grid;justify-items:start;gap:5px;margin-top:13px}.carry-columns{display:flex;align-items:center;gap:9px;width:100%}.carry-column{display:grid;justify-items:center;min-width:0;padding:5px 9px;border:1px solid #b18b59;border-radius:6px;background:#f5e8cf;color:#5c3e21;font-size:.78rem;text-align:center}.carry-column strong{color:inherit;font-size:1.35rem;line-height:1.1}.carry-current{border-color:#548174;background:#e1eee6;color:var(--deep-teal)}.carry-caption{color:var(--deep-teal);font-size:.91rem;font-weight:750}@media(max-width:420px){.transfer-quantity .place-blocks{grid-template-columns:1fr}.transfer-quantity .rails{min-height:45px}.transfer-quantity .ten-bar{height:45px;background-size:100% 80%}}.digit-tiles{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.digit-tiles span{display:grid;place-items:center;min-width:43px;padding:6px 10px;background:#edc891;border-radius:7px;color:#513c21;font-size:1.3rem;font-weight:850;box-shadow:1px 3px 4px #65432144}.abacus{display:flex;width:fit-content;max-width:100%;margin:15px 0 3px;padding:8px 10px 10px;border:7px solid #a77641;border-radius:10px;background:#694929;box-shadow:inset 0 3px 9px #33220fa0,0 5px 8px #5e412844}.rod{width:clamp(58px,17vw,89px);position:relative;display:grid;text-align:center}.rod:before{content:"";position:absolute;z-index:0;top:31px;bottom:0;left:calc(50% - 2px);width:4px;border-radius:2px;background:#d1b17d}.rod-name{position:relative;color:#fff5d9;padding:3px;font-size:.74rem}.bead-row{position:relative;display:flex;align-items:center;gap:0;padding:4px 0;min-height:calc(var(--count) * 44px + 21px)}.bead-row.top{flex-direction:column-reverse;padding-bottom:0}.bead-row.bottom{flex-direction:column;padding-top:0}.bead{position:relative;display:block;width:52px;height:44px;padding:0;border:0;background:transparent}.bead:before{content:"";position:absolute;top:6px;right:0;bottom:6px;left:0;border-radius:45%;background:linear-gradient(#edc995,#b9844b);box-shadow:inset 0 2px #ffffff4b,0 2px 3px #38281391;transition:transform .16s ease;pointer-events:none}.top .bead:not(.engaged):before{transform:translateY(-8px)}.bottom .bead:not(.engaged):before{transform:translateY(8px)}.bead.engaged:before{background:linear-gradient(#72a891,#438173)}@media(prefers-reduced-motion:reduce){.bead:before{transition:none}}.beam{z-index:1;height:7px;background:linear-gradient(#dfb880,#a87940);box-shadow:0 2px 4px #3627137a}.abacus[data-guided=true] .beam{height:21px}.beam>span{display:block;position:relative;width:max-content;padding-inline:4px;font-size:.75rem;font-weight:800;color:#30200e;line-height:21px}.bead>span{display:grid;position:relative;height:100%;place-items:center;color:#291c0e;font-weight:850;pointer-events:none}.top .bead:not(.engaged)>span{transform:translateY(-8px)}.bottom .bead:not(.engaged)>span{transform:translateY(8px)}.abacus[data-guided=true] .bead.engaged:before{border:2px solid #163e33}.bead-comparison{display:flex;flex-wrap:wrap;gap:16px 24px;margin-block:14px}.bead-comparison .abacus{margin-top:5px}.bead-repair-result{display:flex;align-items:center;gap:6px;font-weight:750;color:var(--success)}.rod-name[data-different=true]{background:#ffe4a0;color:#362605;border-radius:4px;font-weight:850}.rod-value{position:relative;align-self:stretch;min-width:0;padding:3px 4px;margin:1px 2px 0;border-radius:5px;background:#fff3d3;color:#362605}.rod-value strong,.rod-value small{display:block;line-height:1.2}.rod-value small{white-space:normal}.hands{display:flex;gap:15px;flex-wrap:wrap;margin-top:13px}.hand{border-radius:13px 13px 24px 24px;padding:8px;background:#f0dec1}.hand strong{display:block;font-size:.78rem;color:#604a34;margin-bottom:6px}.fingers{display:flex;flex-wrap:wrap;gap:3px;align-items:end}.fingers.left{flex-direction:row-reverse}.finger{display:grid;place-items:center;min-height:45px;width:44px;border-radius:16px 16px 7px 7px;background:#e2bb83;border:1px solid #a57443;font-weight:820;color:#352b1d}.finger:nth-child(3){min-height:56px}.finger.engaged,.finger[aria-pressed=true]{color:#fff;border-color:#265949;background:var(--teal)}.cross-grid{display:grid;grid-template-columns:repeat(2,1fr);width:min(330px,100%);aspect-ratio:1.5;gap:8px;margin-top:13px;padding:6px;border:1px solid #d5c2a0;background:#f5eddb;border-radius:8px}.cross-group{display:grid;grid-template-rows:auto minmax(0,1fr);gap:2px;color:var(--ink);font-size:.8rem;font-weight:750}.cross-cell{position:relative;overflow:hidden;background:#fffbef}.cross-active{color:var(--deep-teal);font-weight:900}.cross-active .cross-cell{outline:2px solid var(--teal);outline-offset:-2px}.cross-horizontal,.cross-vertical{position:absolute;background:#9a593b}.cross-horizontal{left:0;right:0;height:2px}.cross-vertical{top:0;bottom:0;width:2px;background:#35756a}.flash-stage{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:13px 0}.flash-stage label{display:flex;align-items:center;gap:8px}.flash-number{flex:1 0 100%;display:grid;place-items:center;min-height:100px;background:#e7eddf;border-radius:9px;color:var(--deep-teal);font-size:clamp(1.65rem,5vw,2.9rem);font-weight:850}.flash-number>div{display:grid;justify-items:center}.flash-position{font-size:.9rem;font-weight:700}@media(max-width:1050px){.app{grid-template-columns:181px minmax(0,1fr)}.sidebar{padding-inline:13px}main,.topbar{padding-inline:25px}.hero-content{padding-left:25px;width:54%}}@media(max-width:820px){html{scroll-padding-block-end:calc(68px + env(safe-area-inset-bottom))}.app{display:block}.sidebar{position:fixed;top:auto;bottom:0;inset-inline:0;height:auto;z-index:5;padding:3px 8px calc(3px + env(safe-area-inset-bottom));border-right:0;border-top:1px solid #142a24;box-shadow:0 -3px 11px #3f2d1c28}.sidebar .brand{display:none}.sidebar nav{grid-template-columns:repeat(4,1fr);gap:2px;margin:0}.sidebar nav a{flex-direction:column;justify-content:center;gap:1px;padding:3px 0;min-height:54px;font-size:.73rem}.sidebar :focus-visible{outline-offset:-3px}.mobile-brand{display:flex;color:var(--ink);font-size:.95rem}.topbar{height:56px;justify-content:space-between}main{padding-bottom:calc(84px + env(safe-area-inset-bottom))}.in-lesson:has(input:focus) .sidebar{visibility:hidden}}@media(max-width:580px){main{padding:13px 14px calc(80px + env(safe-area-inset-bottom))}.topbar{padding-inline:14px}.top-link{font-size:.78rem}.hero{display:flex;flex-direction:column;align-items:stretch;min-height:0}.hero-content{width:100%;padding:24px 19px 11px}.hero h1{font-size:clamp(1.95rem,8.4vw,3.1rem)}.hero p{margin-top:11px}.hero-actions{margin-top:13px}.hero:before{display:none}.hero-image{position:relative;width:100%;height:clamp(137px,42vw,230px);object-position:65% 47%}.home-methods{margin-top:24px}.section-heading{align-items:start;flex-wrap:wrap;gap:8px}.section-heading .outline-link{padding:6px 9px;font-size:.84rem}.course-grid{grid-template-columns:1fr;gap:11px}.course-card{grid-template-columns:102px minmax(0,1fr);grid-template-rows:1fr;min-height:103px}.course-visual{height:100%;aspect-ratio:auto}.course-card-copy{padding:12px 33px 12px 12px}.course-card-copy h3{font-size:1.07rem}.card-arrow{right:9px;bottom:11px}.course-overview{grid-template-columns:88px minmax(0,1fr);align-items:start;gap:13px}.course-overview h1{font-size:1.7rem}.notebook-heading{margin-bottom:12px}.notebook-heading .back{margin-bottom:1px}.lesson-shell h1{font-size:1.8rem}.notebook{padding-inline:7px 5px}.lesson-steps{padding-inline:2px;gap:2px}.lesson-steps li{font-size:.69rem}.step-tab{min-height:49px;gap:2px;flex-direction:column;padding-inline:2px}.step-tab .step-full{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.step-tab .step-compact{display:block}.progress-summary{gap:5px}.progress-summary div{padding:8px}.progress-summary span{font-size:.72rem}.worksheet{padding:15px 13px 20px 15px}.worksheet:before{inset-inline-start:7px}.worksheet-show .sheet-meta{margin-bottom:10px}.worked-step{padding:10px 9px}.lesson-actions{margin-top:16px}.lesson-actions:not(.demo-actions)>.primary{flex-basis:100%}.actions{gap:8px}.answer-form-with-input{grid-template-columns:minmax(0,1fr) max-content}.answer-form-with-input label{width:100%}}.starter-link{display:flex;align-items:center;justify-content:space-between;gap:14px;width:fit-content;max-width:100%;min-height:58px;margin:2px 0 16px;padding:8px 14px;border:1px solid #becbb7;border-radius:8px;background:#edf1e4;color:var(--deep-teal);text-decoration:none}.starter-link strong,.starter-link small{display:block}.starter-link small{color:#435744}.starter-link:hover{background:#e1ead8}.starter-link svg{flex:none}.first-count .notebook{padding-top:8px}.first-count-sheet h2{font-size:clamp(1.65rem,4vw,2.7rem);line-height:1.12;text-wrap:balance}.count-progress{display:flex;gap:5px;margin-bottom:16px}.count-progress span{width:22px;height:5px;border-radius:4px;background:#e6dcc6}.count-progress [data-passed=true]{background:#92a38b}.count-progress [data-current=true]{background:var(--teal)}.count-workbench{display:flex;flex-wrap:wrap;gap:10px;align-items:stretch;margin-top:16px}.count-mat{flex:1 1 245px;min-width:0;max-width:470px;padding:clamp(10px,3vw,23px);border:1px solid #bccdbb;border-radius:10px;background:#e8efe2;box-shadow:inset 0 2px 6px #3851441c}.count-pieces{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:clamp(3px,1.5vw,12px);align-items:center}.count-piece,.count-slot{width:100%;aspect-ratio:1;border-radius:50%}.count-piece{display:grid;place-items:center;border:1px solid #9a6c38;padding:0;background:radial-gradient(circle at 34% 25%,#fae3b4,#d5a56c 76%);color:#42321c;box-shadow:inset 0 -3px #9f714e44,0 2px 3px #57382035;font-size:clamp(1.3rem,4vw,2rem);line-height:1;font-weight:850}.count-piece[aria-pressed=true]{background:#d8e9d5;color:#20483b;border-color:#5a846d}button.count-piece:hover:not([aria-pressed=true]){background:#f3d8a6}.count-piece.is-movable{outline:2px dashed #735026;outline-offset:2px}.count-piece.is-movable:focus-visible{outline:3px solid var(--teal)}.count-slot{border:1px dashed #7a9682;background:#f6f8ef}.count-tally{min-height:1.6em;margin-top:12px;font-weight:750;color:var(--deep-teal)}.count-recount{min-height:44px;margin-top:4px}.count-tray{display:flex;align-items:center;gap:10px;padding:9px 14px;min-height:64px;border:1px solid #bc9f76;border-radius:9px;color:#5a401e;background:#eeddbe;font-weight:800}.count-tray>:is(.count-piece,.count-slot){width:46px}.count-equation{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 16px;margin-top:12px}.count-equation strong{font-size:clamp(1.65rem,6vw,2.5rem);color:var(--deep-teal)}.count-answers{margin-top:16px}.count-options{display:flex;gap:8px;margin-top:8px}.count-options button{min-width:52px;font-size:1.45rem}.count-options [aria-pressed=true]{background:#dce9da;border-color:#53775e}.worksheet .count-feedback{display:flex;align-items:center;gap:6px;min-height:1.5em;margin-top:8px}.count-feedback svg{flex:none}@media(max-width:580px){.count-progress{margin-bottom:12px}.count-workbench{margin-top:12px}}@media(max-width:360px){.count-pieces{grid-template-columns:repeat(3,minmax(44px,1fr));max-width:176px}}@media(prefers-reduced-motion:reduce){.worked-step,.counter.moved{animation:none}.course-card,.bead{transition:none}.course-card:hover,.primary:active{transform:none}}.inline-success{color:var(--success);font-size:.92rem}.inline-success svg{margin-right:4px}.course-preview{color:var(--deep-teal)}.catalog-title{margin-bottom:14px}.catalog-shortcuts{display:flex;flex-wrap:wrap;align-items:center;gap:4px 14px}.catalog-practice-link{white-space:normal}.catalog-shortcuts .text-button{padding-inline:0}.operation-tabs{margin-bottom:8px}.operation-tabs button{background:linear-gradient(#fffaf0,#ecdfc3);box-shadow:0 2px 3px #5e44221c}.operation-tabs button:hover:not([aria-pressed=true]){background:#fff7e4}.featured-methods,.course-catalog{margin-top:26px}.featured-methods h2,.course-catalog h2{margin-bottom:12px}.featured-methods ul{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px 16px;margin:0;padding:0;list-style:none}.method-ticket{--ticket-ink: #18443b;--ticket-rule: #e3e9d8;position:relative;display:grid;align-content:start;gap:4px;height:100%;min-height:116px;padding:15px 33px 14px 16px;border-radius:3px 9px 9px 3px;color:var(--ink);background:repeating-linear-gradient(transparent 0 21px,var(--ticket-rule) 21px 22px),#fffaf0;box-shadow:0 4px 9px #5e472c30,inset 3px 0 #ddc59c;text-decoration:none;overflow-wrap:anywhere}.method-ticket[data-operation=Вычитание]{--ticket-ink: #754427;--ticket-rule: #f0e3ce}.method-ticket[data-operation=Умножение]{--ticket-ink: #354f67;--ticket-rule: #dfe8eb}.method-ticket[data-operation=Деление]{--ticket-ink: #5e405e;--ticket-rule: #eadfea}.method-ticket:hover{background-color:#f7f0df}.method-ticket:active{box-shadow:inset 0 2px 5px #5e472c30}.method-ticket 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button[data-correct=true]{color:#194333;background:#dfeee1;border-color:#377156;box-shadow:inset 0 0 0 2px #377156}.primer-choices button[data-correct=false]{color:#722f23;background:#f8e0d4;border-color:#9b5944;box-shadow:inset 0 0 0 2px #9b5944}.primer-choices button[data-spoken=true]{color:#362605;background:#ffe4a0;outline:2px solid #a56b27;outline-offset:2px}.primer-sets{grid-template-columns:1fr;width:100%;max-width:none}.primer-tray{display:grid;grid-template-rows:1fr auto;gap:6px;padding:var(--primer-tray-padding);border:1px solid #c5b08a;border-radius:10px;background:#f5ead4}.primer-tray[data-correct=true]{grid-template-rows:1fr auto auto;border-color:#377156;background:#dfeee1}.primer-tray[data-correct=false]{border-color:#9b5944;background:#f8e0d4}.primer-tray:has(.primer-feedback){grid-template-rows:auto}.primer-tray .primer-feedback{margin-top:0;padding:8px;border-radius:8px;background:var(--white-paper)}.primer-tray .primer-feedback .actions{gap:4px}.primer-tray 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