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.worksheet-pyramid{justify-self:center}.worksheet-answer-key__pyramid-number[data-astro-cid-aim7nkmc]{padding-top:var(--space-2);color:var(--ink-2);font-size:var(--fs-small);font-weight:800}@media (width<=29.999rem){.worksheet-answer-key__equations[data-astro-cid-aim7nkmc]{grid-template-rows:none;grid-template-columns:1fr;grid-auto-flow:row}.worksheet-answer-key__pyramids[data-astro-cid-aim7nkmc],.worksheet-answer-key__matching-sections[data-astro-cid-aim7nkmc]{grid-template-columns:1fr}}.worksheet-experience[data-astro-cid-lpq4ccmc]{gap:var(--space-8);display:grid}.worksheet-experience__actions[data-astro-cid-lpq4ccmc]{width:min(100%,46rem);padding:var(--space-4);border:1.5px solid var(--ink-3);border-radius:var(--radius-5);background:var(--surface);align-items:center;gap:var(--space-3);flex-wrap:wrap;margin-inline:auto;display:flex}.worksheet-experience__pages[data-astro-cid-lpq4ccmc]{justify-items:center;gap:var(--space-8);display:grid}@media 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.worksheet-number-bond{justify-self:center;max-width:100%}.worksheet-mini-preview__equation-completion[data-astro-cid-rd5o6b4e] li[data-astro-cid-rd5o6b4e]{grid-template-columns:2rem minmax(0,1fr);align-items:center}.worksheet-mini-preview__equation-completion[data-astro-cid-rd5o6b4e] .equation-completion-equation,.worksheet-mini-preview__missing-number[data-astro-cid-rd5o6b4e] .missing-number-equation{justify-self:center}.worksheet-mini-preview__pyramid[data-astro-cid-rd5o6b4e]{min-height:15rem;margin-top:var(--space-6);place-items:center;display:grid}.worksheet-page__editorial[data-astro-cid-rd5o6b4e]{padding-block:var(--space-8);padding-inline:var(--space-8);border-left:.35rem solid var(--yellow);background:var(--surface);padding-inline-start:var(--space-12)}.worksheet-page__editorial[data-astro-cid-rd5o6b4e] h2+p,.worksheet-page__editorial[data-astro-cid-rd5o6b4e] p+p{margin-top:var(--space-4)}.worksheet-page__editorial[data-astro-cid-rd5o6b4e] 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a[data-astro-cid-rd5o6b4e]{min-height:var(--touch-target);color:var(--primary-2);align-items:center;font-weight:750;display:inline-flex}.worksheet-page__trust[data-astro-cid-rd5o6b4e] ul[data-astro-cid-rd5o6b4e]{margin:var(--space-5) 0 0;gap:var(--space-4);grid-template-columns:repeat(3,1fr);padding:0;list-style:none;display:grid}.worksheet-page__trust[data-astro-cid-rd5o6b4e] li[data-astro-cid-rd5o6b4e]{padding:var(--space-4);border-top:3px solid var(--ink);background:var(--surface-2);font-weight:700}@media (width<=71.999rem){.worksheet-page__topic-grid[data-astro-cid-rd5o6b4e]{grid-template-columns:1fr}}@media (width<=47.999rem){.worksheet-page__steps[data-astro-cid-rd5o6b4e] ol[data-astro-cid-rd5o6b4e],.worksheet-page__trust[data-astro-cid-rd5o6b4e] ul[data-astro-cid-rd5o6b4e],.worksheet-page__choice-list[data-astro-cid-rd5o6b4e],.worksheet-page__worksheet-grid[data-astro-cid-rd5o6b4e]{grid-template-columns:1fr}.worksheet-skill-card[data-astro-cid-rd5o6b4e] 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var(--space-16);margin-inline:auto}.practice-page__intro[data-astro-cid-iqoxxgyd],.practice-page__choice[data-astro-cid-iqoxxgyd],.practice-page__topic-grid[data-astro-cid-iqoxxgyd],.practice-page__session[data-astro-cid-iqoxxgyd],.practice-page__editorial[data-astro-cid-iqoxxgyd],.practice-worksheet-link[data-astro-cid-iqoxxgyd],.practice-related-link[data-astro-cid-iqoxxgyd],.practice-page__trust[data-astro-cid-iqoxxgyd],.practice-page[data-astro-cid-iqoxxgyd] .practice-handoff{width:min(100%, var(--content-measure));margin-inline:auto}.practice-page__hero[data-astro-cid-iqoxxgyd]{padding-block:var(--space-8) var(--space-12)}.practice-page__hero[data-astro-cid-iqoxxgyd] 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var(--ink);background:var(--paper);border-radius:50%;place-items:center;width:4.5rem;height:4.5rem;font-size:1.75rem;font-weight:800;display:grid;position:absolute}.number-bond-preview__whole[data-astro-cid-iqoxxgyd]{top:0;left:50%;transform:translate(-50%)}.number-bond-preview__part[data-astro-cid-iqoxxgyd]{bottom:0}.number-bond-preview__part--a[data-astro-cid-iqoxxgyd]{left:.875rem}.number-bond-preview__part--b[data-astro-cid-iqoxxgyd]{right:.875rem}.practice-page__topic-grid[data-astro-cid-iqoxxgyd]{align-items:stretch;gap:var(--space-8);grid-template-columns:minmax(15rem,.7fr) minmax(24rem,1.3fr);display:grid}.practice-page__topic-grid--expanded[data-astro-cid-iqoxxgyd]{grid-template-columns:1fr}.practice-page__topic-grid--expanded[data-astro-cid-iqoxxgyd] .practice-example[data-astro-cid-iqoxxgyd]{min-height:12rem}.practice-example[data-astro-cid-iqoxxgyd]{min-height:100%;padding:var(--space-8);border:1.5px solid 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var(--ink);border-radius:var(--radius-3);background:var(--surface);width:1.2em;height:1.1em}.practice-example__blank--operator[data-astro-cid-iqoxxgyd]{color:var(--ink-2);place-items:center;font-weight:800;display:inline-grid}.pyramid-rule[data-astro-cid-iqoxxgyd]{justify-items:start}.pyramid-rule__mark[data-astro-cid-iqoxxgyd]{width:4.75rem;height:4.25rem;margin-bottom:var(--space-6);border:2px solid var(--ink);border-radius:var(--radius-3);background:var(--surface);place-items:center;font-size:2rem;font-weight:800;display:grid}.pyramid-rule[data-astro-cid-iqoxxgyd]>p[data-astro-cid-iqoxxgyd]:last-child{color:var(--ink-2);font-size:var(--fs-body-child)}.practice-example[data-astro-cid-iqoxxgyd] .equation-inline{font-size:clamp(2rem,5vw,3rem)}.practice-example__equation[data-astro-cid-iqoxxgyd] strong[data-astro-cid-iqoxxgyd]{color:var(--primary-2)}.practice-page__session[data-astro-cid-iqoxxgyd]{padding:var(--space-8);border-radius:var(--radius-7);background:color-mix(in srgb, var(--primary-tint) 58%, var(--paper));align-items:start;gap:clamp(var(--space-6), 3vw, var(--space-12));grid-template-columns:minmax(12rem,.62fr) minmax(24rem,1.38fr);display:grid}.practice-page__session-heading[data-astro-cid-iqoxxgyd]{padding-top:var(--space-12)}.practice-page__session-supporting[data-astro-cid-iqoxxgyd]{max-width:27ch;margin-top:var(--space-4);color:var(--ink-2)}.practice-page__session[data-astro-cid-iqoxxgyd] .practice{justify-self:start}.practice-page__editorial[data-astro-cid-iqoxxgyd]{padding-block:var(--space-16)}.practice-page__editorial[data-astro-cid-iqoxxgyd] h2,.practice-page__editorial[data-astro-cid-iqoxxgyd] p{max-width:var(--editorial-measure)}.practice-page__editorial[data-astro-cid-iqoxxgyd] h2{margin-top:var(--space-12)}.practice-page__editorial[data-astro-cid-iqoxxgyd] h2:first-child{margin-top:0}.practice-page__editorial[data-astro-cid-iqoxxgyd] p{margin-top:var(--space-4);color:var(--ink-2)}.practice-worksheet-link[data-astro-cid-iqoxxgyd],.practice-related-link[data-astro-cid-iqoxxgyd]{min-width:0;padding:var(--space-8);border:2px solid var(--ink);border-radius:var(--radius-4);justify-content:space-between;align-items:center;gap:var(--space-6);display:flex}.practice-worksheet-link[data-astro-cid-iqoxxgyd] p[data-astro-cid-iqoxxgyd],.practice-related-link[data-astro-cid-iqoxxgyd] p[data-astro-cid-iqoxxgyd]{margin-top:var(--space-2);color:var(--ink-2)}.practice-worksheet-link[data-astro-cid-iqoxxgyd] a[data-astro-cid-iqoxxgyd],.practice-related-link[data-astro-cid-iqoxxgyd] a[data-astro-cid-iqoxxgyd]{min-height:var(--touch-target);color:var(--primary-2);flex:none;align-items:center;font-weight:800;display:inline-flex}.practice-page__trust[data-astro-cid-iqoxxgyd]{padding:var(--space-8);border-block:1.5px solid var(--ink-3)}.practice-worksheet-link[data-astro-cid-iqoxxgyd]+.practice-page__trust[data-astro-cid-iqoxxgyd],.practice-related-link[data-astro-cid-iqoxxgyd]+.practice-page__trust[data-astro-cid-iqoxxgyd]{margin-top:var(--space-16)}.practice-page__trust[data-astro-cid-iqoxxgyd] ul[data-astro-cid-iqoxxgyd]{margin:var(--space-6) 0 0;gap:var(--space-4);grid-template-columns:repeat(3,1fr);padding:0;list-style:none;display:grid}.practice-page__trust[data-astro-cid-iqoxxgyd] li[data-astro-cid-iqoxxgyd]{padding-left:var(--space-6);font-weight:750;position:relative}.practice-page__trust[data-astro-cid-iqoxxgyd] li[data-astro-cid-iqoxxgyd]:before{color:var(--success-text);content:"√";font-weight:900;position:absolute;left:0}.practice-page[data-astro-cid-iqoxxgyd] .practice-handoff{margin-top:var(--space-16)}@media (width<=63.999rem){.practice-page__topic-grid[data-astro-cid-iqoxxgyd]{grid-template-columns:1fr}.practice-example[data-astro-cid-iqoxxgyd]{min-height:auto}}@media (width<=47.999rem){.worksheet-page[data-astro-cid-iqoxxgyd]{padding-top:var(--space-6)}.worksheet-page__editorial[data-astro-cid-iqoxxgyd]{padding:var(--space-8) var(--space-6);padding-inline-start:var(--space-8)}.worksheet-page__hero[data-astro-cid-iqoxxgyd]{padding-block:var(--space-6) var(--space-8)}.practice-page[data-astro-cid-iqoxxgyd]{padding-top:var(--space-6)}.practice-page__hero[data-astro-cid-iqoxxgyd]{padding-block:var(--space-6) var(--space-8)}.practice-page__topic-grid[data-astro-cid-iqoxxgyd],.practice-page__session[data-astro-cid-iqoxxgyd],.practice-page__choice-list[data-astro-cid-iqoxxgyd]{grid-template-columns:1fr}.practice-page__session[data-astro-cid-iqoxxgyd]{padding:var(--space-6) var(--space-4);gap:var(--space-4)}.practice-page__session-heading[data-astro-cid-iqoxxgyd]{padding-top:0}.practice-page__session[data-astro-cid-iqoxxgyd] .practice{justify-self:center}.practice-page__trust[data-astro-cid-iqoxxgyd] 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var(--ink);border-radius:var(--radius-5);background:var(--surface);box-shadow:var(--key-edge);color:var(--ink);cursor:pointer;font:inherit;align-content:start;justify-items:start;gap:var(--space-3);text-align:left;transition:transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);display:grid}.game-board__choices[data-astro-cid-iykkakpl] button[data-astro-cid-iykkakpl]:hover,.game-board__choices[data-astro-cid-iykkakpl] button[data-astro-cid-iykkakpl]:focus-visible{box-shadow:.5rem .5rem 0 var(--yellow);transform:translate(-.2rem,-.2rem)}.game-board__choices[data-astro-cid-iykkakpl] strong[data-astro-cid-iykkakpl]{font-family:var(--font-display);font-size:var(--fs-h3)}.game-board__icon[data-astro-cid-iykkakpl]{min-width:3.5rem;height:3.5rem;padding-inline:var(--space-2);border:2px solid var(--ink);border-radius:var(--radius-4);background:var(--yellow-soft);place-items:center;font-size:1.4rem;font-weight:800;display:grid;transform:rotate(-2deg)}.game-board__action[data-astro-cid-iykkakpl]{color:var(--primary-2);margin-top:auto;font-weight:800}.game-board__play[data-astro-cid-iykkakpl]{max-width:var(--editorial-measure);padding:clamp(var(--space-6), 4vw, var(--space-12));border:1.5px solid var(--ink);border-radius:var(--radius-5);background:var(--surface);box-shadow:var(--key-edge)}.game-board__progress[data-astro-cid-iykkakpl]{color:var(--primary-2);font-weight:800}.game-board__play[data-astro-cid-iykkakpl] h2[data-astro-cid-iykkakpl]{margin-top:var(--space-3)}.game-board__question[data-astro-cid-iykkakpl]{margin-block:var(--space-6);font-size:var(--fs-math-q);font-weight:800}.game-board__play[data-astro-cid-iykkakpl] form[data-astro-cid-iykkakpl]{justify-items:start;gap:var(--space-3);display:grid}.game-board__play[data-astro-cid-iykkakpl] label[data-astro-cid-iykkakpl]{font-weight:700}.game-board__play[data-astro-cid-iykkakpl] input[data-astro-cid-iykkakpl]{width:8rem;min-height:var(--child-action-target);padding:var(--space-2) var(--space-3);border:2px solid var(--ink);border-radius:var(--radius-3);background:var(--paper);color:var(--ink);font:inherit;font-size:var(--fs-math-a);text-align:center;font-weight:800}.game-board__play[data-astro-cid-iykkakpl] input[data-astro-cid-iykkakpl]:focus-visible{border-color:var(--primary);outline:3px solid var(--primary-tint)}.game-board__numbers[data-astro-cid-iykkakpl]{gap:var(--space-3);grid-template-columns:repeat(2,minmax(0,1fr));width:100%;max-width:23rem;display:grid}.game-board__numbers[data-astro-cid-iykkakpl] button,.game-board__primary[data-astro-cid-iykkakpl],.game-board__key[data-astro-cid-iykkakpl]{min-height:var(--child-action-target);padding:var(--space-3) var(--space-4);border:2px solid var(--ink);border-radius:var(--radius-4);background:var(--paper);box-shadow:var(--key-edge);color:var(--ink);cursor:pointer;font:inherit;transition:transform var(--dur-micro) var(--ease-out), box-shadow var(--dur-micro) var(--ease-out);font-weight:800}.game-board__numbers[data-astro-cid-iykkakpl] button:active,.game-board__primary[data-astro-cid-iykkakpl]:active,.game-board__key[data-astro-cid-iykkakpl]:active{box-shadow:var(--key-edge-pressed);transform:translateY(2px)}.game-board__numbers[data-astro-cid-iykkakpl] button{font-size:var(--fs-math-a)}.game-board__numbers[data-astro-cid-iykkakpl] button[data-state=correct]{border-color:var(--success);background:color-mix(in srgb, var(--success) 8%, var(--surface))}.game-board__numbers[data-astro-cid-iykkakpl] button[data-state=correct]:after{margin-left:var(--space-1);color:var(--success-text);content:"√";font-size:1.25rem}.game-board__numbers[data-astro-cid-iykkakpl] button[data-state=incorrect]{background:var(--surface-2);color:var(--ink-2);border-style:dashed}.game-board__numbers[data-astro-cid-iykkakpl] button:disabled{cursor:default}.game-board__primary[data-astro-cid-iykkakpl],.game-board__key--primary[data-astro-cid-iykkakpl]{border-color:var(--primary-2);background:var(--primary);box-shadow:var(--key-edge-primary);color:var(--surface)}.game-board__primary[data-astro-cid-iykkakpl]:active,.game-board__key--primary[data-astro-cid-iykkakpl]:active{box-shadow:var(--key-edge-primary-pressed)}.game-board__primary[data-astro-cid-iykkakpl]:disabled{border-color:var(--ink-3);background:var(--surface-2);box-shadow:none;color:var(--ink-2);cursor:default;transform:none}.game-board__feedback[data-astro-cid-iykkakpl]{min-height:1.7em;margin-top:var(--space-4);align-items:center;gap:var(--space-2);font-weight:800;display:flex}.game-board__glyph[data-astro-cid-iykkakpl]{border:2px solid;border-radius:50%;place-items:center;width:1.75rem;height:1.75rem;font-weight:800;line-height:1;display:inline-grid}.game-board__glyph[data-astro-cid-iykkakpl]:empty{display:none}.game-board__play[data-astro-cid-iykkakpl][data-result=correct] .game-board__feedback[data-astro-cid-iykkakpl]{color:var(--success-text)}.game-board__play[data-astro-cid-iykkakpl][data-result=incorrect] .game-board__feedback[data-astro-cid-iykkakpl],.game-board__play[data-astro-cid-iykkakpl][data-result=unanswered] .game-board__feedback[data-astro-cid-iykkakpl],.game-board__play[data-astro-cid-iykkakpl][data-result=invalid] .game-board__feedback[data-astro-cid-iykkakpl]{color:var(--retry-text)}.game-board__actions[data-astro-cid-iykkakpl]{margin-top:var(--space-6);gap:var(--space-3);flex-wrap:wrap;display:flex}.game-board__completion[data-astro-cid-iykkakpl]{margin-top:var(--space-8);padding-top:var(--space-6);border-top:1px solid var(--ink-3);gap:var(--space-4);display:grid}.game-board__completion-links[data-astro-cid-iykkakpl]{gap:var(--space-2) var(--space-6);flex-wrap:wrap;display:flex}.game-board__completion-links[data-astro-cid-iykkakpl] a[data-astro-cid-iykkakpl]{min-height:var(--touch-target);color:var(--primary-2);text-decoration-color:var(--yellow);align-items:center;font-weight:800;display:inline-flex}.game-board__completion-app[data-astro-cid-iykkakpl]{align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.game-board__completion-label[data-astro-cid-iykkakpl]{width:100%;color:var(--ink-2);font-size:var(--fs-small);letter-spacing:.06em;text-transform:uppercase;font-weight:800}@media (width<=47.999rem){.game-board[data-astro-cid-iykkakpl]{margin-top:var(--space-8)}}@media (width<=35.999rem){.game-board__choices[data-astro-cid-iykkakpl]{grid-template-columns:1fr}.game-board__choices[data-astro-cid-iykkakpl] button[data-astro-cid-iykkakpl]{min-height:12rem}.game-board__actions[data-astro-cid-iykkakpl]{display:grid}}@media (width<=29.999rem){.game-board__play[data-astro-cid-iykkakpl]{padding:var(--space-4)}.game-board__play[data-astro-cid-iykkakpl] input[data-astro-cid-iykkakpl]{width:100%;max-width:10rem}.game-board__primary[data-astro-cid-iykkakpl]{width:100%}}@media (prefers-reduced-motion:reduce){.game-board__choices[data-astro-cid-iykkakpl] button[data-astro-cid-iykkakpl],.game-board__numbers[data-astro-cid-iykkakpl] button,.game-board__primary[data-astro-cid-iykkakpl],.game-board__key[data-astro-cid-iykkakpl]{transition:none}}.product-page[data-astro-cid-xdazsypj]{min-height:65vh;padding:clamp(var(--space-8), 5vw, var(--space-16)) var(--page-gutter) var(--space-16)}.product-page__inner[data-astro-cid-xdazsypj]{width:min(100%, var(--content-measure));margin-inline:auto}.product-page__eyebrow[data-astro-cid-xdazsypj]{color:var(--primary-2);font-size:var(--fs-small);letter-spacing:.08em;text-transform:uppercase;font-weight:800}h1[data-astro-cid-xdazsypj]{max-width:18ch;margin-top:var(--space-3);font-size:var(--fs-h1)}.product-page__summary[data-astro-cid-xdazsypj]{max-width:var(--editorial-measure);margin-top:var(--space-4);color:var(--ink-2);font-size:var(--fs-body-child)}.product-page__editorial[data-astro-cid-xdazsypj]{max-width:var(--editorial-measure);margin-top:var(--space-8);color:var(--ink-2)}.product-page__editorial[data-astro-cid-xdazsypj] h2{margin-block:var(--space-8) var(--space-3);color:var(--ink);font-size:var(--fs-h3)}.product-page__editorial[data-astro-cid-xdazsypj] p+p{margin-top:var(--space-3)}.product-page__section[data-astro-cid-xdazsypj],.product-page__grades[data-astro-cid-xdazsypj]{margin-top:var(--space-12)}.product-page__grades[data-astro-cid-xdazsypj] h2[data-astro-cid-xdazsypj]{margin-bottom:var(--space-5);font-size:var(--fs-h2)}.product-page__grades[data-astro-cid-xdazsypj]>div[data-astro-cid-xdazsypj]{gap:var(--space-3);flex-wrap:wrap;display:flex}.product-page__grades[data-astro-cid-xdazsypj] a[data-astro-cid-xdazsypj]{min-height:var(--child-action-target);padding:var(--space-3) var(--space-4);border:2px solid var(--ink);border-radius:var(--radius-3);background:var(--surface);color:var(--ink);box-shadow:var(--key-edge);align-items:center;font-weight:800;text-decoration:none;display:inline-flex}.product-page__section[data-astro-cid-xdazsypj] h2[data-astro-cid-xdazsypj]{margin-bottom:var(--space-6)}.product-page__choices[data-astro-cid-xdazsypj],.worked-examples[data-astro-cid-xdazsypj],.parent-intents[data-astro-cid-xdazsypj]{gap:var(--space-6);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.product-choice[data-astro-cid-xdazsypj],.worked-example[data-astro-cid-xdazsypj]{min-width:0;padding:clamp(var(--space-6), 3vw, var(--space-8));border:1.5px solid var(--ink);border-radius:var(--radius-5);background:var(--surface);box-shadow:var(--key-edge)}.product-choice[data-astro-cid-xdazsypj]{color:var(--ink);align-content:start;gap:var(--space-2);transition:transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);text-decoration:none;display:grid}.product-choice[data-astro-cid-xdazsypj] strong[data-astro-cid-xdazsypj]{font-family:var(--font-display);font-size:var(--fs-h3);align-items:center;gap:var(--space-3);display:flex}.product-choice__mark[data-astro-cid-xdazsypj]{border:2px solid var(--ink);border-radius:var(--radius-4);background:var(--yellow-soft);place-items:center;width:3rem;height:3rem;font-size:1.6rem;font-weight:800;display:grid;transform:rotate(-2deg)}.product-choice__action[data-astro-cid-xdazsypj]{margin-top:var(--space-3);color:var(--primary-2);font-weight:800}.product-choice[data-astro-cid-xdazsypj]:hover,.product-choice[data-astro-cid-xdazsypj]:focus-visible{box-shadow:.5rem .5rem 0 var(--yellow);transform:translate(-.2rem,-.2rem)}.worked-example__equation[data-astro-cid-xdazsypj]{font-size:var(--fs-math-a);overflow-wrap:anywhere;font-weight:800}.worked-example__equation[data-astro-cid-xdazsypj] strong[data-astro-cid-xdazsypj]{color:var(--primary-2)}.lesson-fraction[data-astro-cid-xdazsypj]{vertical-align:middle;flex-direction:column;align-items:center;min-width:1.4em;line-height:1.1;display:inline-flex}.lesson-fraction[data-astro-cid-xdazsypj] span[data-astro-cid-xdazsypj]:first-child{text-align:center;border-bottom:2px solid;width:100%;padding-bottom:.08em}.lesson-fraction[data-astro-cid-xdazsypj] span[data-astro-cid-xdazsypj]:last-child{padding-top:.08em}.worked-example[data-astro-cid-xdazsypj] ol[data-astro-cid-xdazsypj]{margin-top:var(--space-4);padding-left:1.5rem}.worked-example[data-astro-cid-xdazsypj] li[data-astro-cid-xdazsypj]+li[data-astro-cid-xdazsypj]{margin-top:var(--space-2)}.worked-example__counters[data-astro-cid-xdazsypj]{margin-top:var(--space-6);flex-wrap:wrap;gap:.4rem;display:flex}.worked-example__counters[data-astro-cid-xdazsypj] span[data-astro-cid-xdazsypj]{border:2px solid var(--ink);border-radius:50%;width:1.4rem;height:1.4rem;position:relative}.worked-example__counters[data-astro-cid-xdazsypj] .is-first[data-astro-cid-xdazsypj]{background:var(--primary-tint)}.worked-example__counters[data-astro-cid-xdazsypj] .is-second[data-astro-cid-xdazsypj]{background:var(--yellow)}.worked-example__counters[data-astro-cid-xdazsypj] .is-removed[data-astro-cid-xdazsypj]{border-color:var(--ink-3)}.worked-example__counters[data-astro-cid-xdazsypj] .is-removed[data-astro-cid-xdazsypj]:after{background:var(--ink);content:"";width:calc(100% + .4rem);height:2px;position:absolute;top:50%;left:-.2rem;transform:rotate(-40deg)}.lesson-check[data-astro-cid-xdazsypj]{max-width:var(--editorial-measure);padding:var(--space-6);border-left:.4rem solid var(--yellow);background:var(--surface)}.lesson-check__choices[data-astro-cid-xdazsypj]{margin-top:var(--space-4);gap:var(--space-3);flex-wrap:wrap;display:flex}.lesson-check__choices[data-astro-cid-xdazsypj] button[data-astro-cid-xdazsypj]{min-width:4rem;min-height:var(--child-action-target);border:2px solid var(--ink);border-radius:var(--radius-4);background:var(--paper);box-shadow:var(--key-edge);color:var(--ink);cursor:pointer;font:inherit;font-size:var(--fs-body-child);transition:transform var(--dur-micro) var(--ease-out), box-shadow var(--dur-micro) var(--ease-out);font-weight:800}.lesson-check__choices[data-astro-cid-xdazsypj] button[data-astro-cid-xdazsypj]:active{box-shadow:var(--key-edge-pressed);transform:translateY(2px)}.lesson-check__choices[data-astro-cid-xdazsypj] button[data-astro-cid-xdazsypj][data-state=correct]{border-color:var(--success);background:color-mix(in srgb, var(--success) 8%, var(--surface))}.lesson-check__choices[data-astro-cid-xdazsypj] button[data-astro-cid-xdazsypj][data-state=correct]:after{margin-left:var(--space-1);color:var(--success-text);content:"√"}.lesson-check__choices[data-astro-cid-xdazsypj] button[data-astro-cid-xdazsypj][data-state=incorrect]{background:var(--surface-2);color:var(--ink-2);border-style:dashed}.lesson-check__feedback[data-astro-cid-xdazsypj]{min-height:1.7em;margin-top:var(--space-3);align-items:center;gap:var(--space-2);font-weight:750;display:flex}.lesson-check__glyph[data-astro-cid-xdazsypj]:empty{display:none}.lesson-check__glyph[data-astro-cid-xdazsypj]{border:2px solid;border-radius:50%;place-items:center;width:1.75rem;height:1.75rem;font-weight:800;line-height:1;display:inline-grid}.lesson-check[data-astro-cid-xdazsypj][data-result=correct] .lesson-check__feedback[data-astro-cid-xdazsypj]{color:var(--success-text)}.lesson-check[data-astro-cid-xdazsypj][data-result=incorrect] .lesson-check__feedback[data-astro-cid-xdazsypj]{color:var(--retry-text)}.product-page__continuation[data-astro-cid-xdazsypj],.product-page__handoff[data-astro-cid-xdazsypj]>div[data-astro-cid-xdazsypj]{margin-top:var(--space-8);gap:var(--space-3);flex-wrap:wrap;display:flex}.product-page__continuation[data-astro-cid-xdazsypj] a[data-astro-cid-xdazsypj]{min-height:var(--touch-target);padding:var(--space-3) var(--space-4);border:2px solid var(--ink);border-radius:var(--radius-4);background:var(--yellow);box-shadow:var(--key-edge);color:var(--ink);text-align:center;transition:transform var(--dur-micro) var(--ease-out), box-shadow var(--dur-micro) var(--ease-out);justify-content:center;align-items:center;font-weight:800;text-decoration:none;display:inline-flex}.product-page__continuation[data-astro-cid-xdazsypj] a[data-astro-cid-xdazsypj].is-secondary{background:var(--surface)}.product-page__continuation[data-astro-cid-xdazsypj] a[data-astro-cid-xdazsypj]:hover{background:var(--yellow-soft)}.product-page__continuation[data-astro-cid-xdazsypj] a[data-astro-cid-xdazsypj]:active{box-shadow:var(--key-edge-pressed);transform:translateY(2px)}.parent-intents[data-astro-cid-xdazsypj]{gap:0 var(--space-8);grid-template-columns:repeat(2,minmax(0,1fr))}.parent-intent[data-astro-cid-xdazsypj]{--intent-accent:var(--primary);min-width:0;padding:var(--space-6) 0;border-top:3px solid var(--intent-accent);grid-template-rows:auto auto 1fr auto;align-content:start;display:grid}.parent-intent[data-astro-cid-xdazsypj][data-parent-intent=addition]{--intent-accent:var(--topic-addition)}.parent-intent[data-astro-cid-xdazsypj][data-parent-intent=subtraction]{--intent-accent:var(--topic-subtraction)}.parent-intent[data-astro-cid-xdazsypj][data-parent-intent=short]{--intent-accent:var(--primary)}.parent-intent[data-astro-cid-xdazsypj][data-parent-intent=printable]{--intent-accent:var(--topic-measurement)}.parent-intent[data-astro-cid-xdazsypj][data-parent-intent=screen]{--intent-accent:var(--topic-fractions)}.parent-intent[data-astro-cid-xdazsypj][data-parent-intent=play]{--intent-accent:var(--topic-division)}.parent-intent__glyph[data-astro-cid-xdazsypj]{width:2.5rem;height:2.5rem;margin-bottom:var(--space-4);border:2px solid var(--ink);border-radius:var(--radius-3);background:color-mix(in srgb, var(--intent-accent) 22%, var(--paper));color:var(--ink);box-shadow:0 3px 0 var(--intent-accent);place-items:center;font-size:1.05rem;font-weight:800;line-height:1;display:grid;rotate:-2deg}.parent-intent[data-astro-cid-xdazsypj] h3[data-astro-cid-xdazsypj]{font-size:var(--fs-h3)}.parent-intent[data-astro-cid-xdazsypj] p[data-astro-cid-xdazsypj]{margin-block:var(--space-3);color:var(--ink-2)}.parent-intent[data-astro-cid-xdazsypj] a[data-astro-cid-xdazsypj]{min-height:var(--touch-target);color:var(--primary-2);text-decoration-color:var(--yellow);justify-self:start;align-items:center;font-weight:800;display:inline-flex}.parent-guidance[data-astro-cid-xdazsypj]{max-width:var(--editorial-measure)}.parent-guidance[data-astro-cid-xdazsypj] ol[data-astro-cid-xdazsypj],.parent-guidance[data-astro-cid-xdazsypj] ul[data-astro-cid-xdazsypj]{padding-left:1.5rem}.parent-guidance[data-astro-cid-xdazsypj] li[data-astro-cid-xdazsypj]+li[data-astro-cid-xdazsypj]{margin-top:var(--space-3)}.product-page__handoff[data-astro-cid-xdazsypj]{margin-top:var(--space-16);padding:var(--space-8) 0 0;border-top:2px solid var(--ink)}.product-page__handoff[data-astro-cid-xdazsypj]>div[data-astro-cid-xdazsypj]{margin-top:var(--space-6)}@media (width<=47.999rem){.parent-intents[data-astro-cid-xdazsypj]{grid-template-columns:1fr}.product-page__section[data-astro-cid-xdazsypj]{margin-top:var(--space-8)}}@media (width<=35.999rem){.product-page__choices[data-astro-cid-xdazsypj],.worked-examples[data-astro-cid-xdazsypj],.parent-intents[data-astro-cid-xdazsypj]{grid-template-columns:1fr}.product-page__continuation[data-astro-cid-xdazsypj]{display:grid}}@media (prefers-reduced-motion:reduce){.product-choice[data-astro-cid-xdazsypj],.lesson-check__choices[data-astro-cid-xdazsypj] button[data-astro-cid-xdazsypj],.product-page__continuation[data-astro-cid-xdazsypj] a[data-astro-cid-xdazsypj]{transition:none}}.grade-page[data-astro-cid-3higsh67]{min-height:65vh;padding:clamp(var(--space-8), 5vw, var(--space-16)) var(--page-gutter) var(--space-16)}.grade-page__inner[data-astro-cid-3higsh67]{width:min(100%, var(--content-measure));margin-inline:auto}.grade-page__eyebrow[data-astro-cid-3higsh67],.grade-start__eyebrow[data-astro-cid-3higsh67]{color:var(--primary-2);font-size:var(--fs-small);letter-spacing:.08em;text-transform:uppercase;font-weight:800}h1[data-astro-cid-3higsh67]{max-width:20ch;margin-top:var(--space-3);font-size:var(--fs-h1)}.grade-page__summary[data-astro-cid-3higsh67]{max-width:var(--editorial-measure);margin-top:var(--space-4);color:var(--ink-2);font-size:var(--fs-body-child)}.grade-page__scope[data-astro-cid-3higsh67]{margin-top:var(--space-3);color:var(--ink-2);font-size:var(--fs-small)}.grade-start[data-astro-cid-3higsh67]{justify-content:space-between;align-items:center;gap:var(--space-6);margin-top:var(--space-12);padding:var(--space-8);border:2px solid var(--ink);border-radius:var(--radius-5);background:var(--surface);box-shadow:var(--key-edge);display:flex}.grade-start[data-astro-cid-3higsh67] h2[data-astro-cid-3higsh67]{margin-top:var(--space-2);font-family:var(--font-display);font-size:var(--fs-h3)}.grade-start[data-astro-cid-3higsh67] p[data-astro-cid-3higsh67]:last-child{max-width:58ch;margin-top:var(--space-2);color:var(--ink-2)}.grade-start[data-astro-cid-3higsh67] a[data-astro-cid-3higsh67]{min-height:var(--child-action-target);padding:var(--space-3) var(--space-4);border:2px solid var(--ink);border-radius:var(--radius-3);background:var(--yellow);color:var(--ink);box-shadow:var(--key-edge);flex:none;align-items:center;font-weight:800;text-decoration:none;display:inline-flex}.grade-page__editorial[data-astro-cid-3higsh67]{max-width:var(--editorial-measure);margin-top:var(--space-12);color:var(--ink-2)}.grade-page__editorial[data-astro-cid-3higsh67] h2{margin-block:var(--space-8) var(--space-3);color:var(--ink);font-size:var(--fs-h3)}.grade-page__editorial[data-astro-cid-3higsh67] p+p{margin-top:var(--space-3)}.grade-lessons[data-astro-cid-3higsh67],.grade-resources[data-astro-cid-3higsh67],.grade-other[data-astro-cid-3higsh67]{margin-top:var(--space-12)}.grade-lessons[data-astro-cid-3higsh67] h2[data-astro-cid-3higsh67],.grade-resources[data-astro-cid-3higsh67] h2[data-astro-cid-3higsh67],.grade-other[data-astro-cid-3higsh67] h2[data-astro-cid-3higsh67]{margin-bottom:var(--space-5);font-size:var(--fs-h2)}.grade-lessons__links[data-astro-cid-3higsh67],.grade-other[data-astro-cid-3higsh67]>div[data-astro-cid-3higsh67]{gap:var(--space-3);flex-wrap:wrap;display:flex}.grade-lessons[data-astro-cid-3higsh67] a[data-astro-cid-3higsh67],.grade-other[data-astro-cid-3higsh67] a[data-astro-cid-3higsh67]{align-items:center;gap:var(--space-3);min-height:var(--child-action-target);padding:var(--space-3) var(--space-4);border:2px solid var(--ink);border-radius:var(--radius-3);background:var(--surface);color:var(--ink);box-shadow:var(--key-edge);font-weight:800;text-decoration:none;display:flex}.grade-lessons[data-astro-cid-3higsh67] a[data-astro-cid-3higsh67] span[data-astro-cid-3higsh67]{color:var(--primary-2)}.grade-resources__grid[data-astro-cid-3higsh67]{gap:var(--space-4);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.grade-card[data-astro-cid-3higsh67]{min-width:0;padding:var(--space-6);border:2px solid var(--ink);border-radius:var(--radius-5);background:var(--surface);box-shadow:var(--key-edge);flex-direction:column;display:flex}.grade-card__number[data-astro-cid-3higsh67]{color:var(--primary-2);font-size:var(--fs-small);font-weight:800}.grade-card[data-astro-cid-3higsh67] h3[data-astro-cid-3higsh67]{margin-top:var(--space-3);font-family:var(--font-display);font-size:var(--fs-h3);overflow-wrap:anywhere}.grade-card[data-astro-cid-3higsh67] p[data-astro-cid-3higsh67]{margin-top:var(--space-3);color:var(--ink-2)}.grade-card__links[data-astro-cid-3higsh67]{gap:var(--space-3) var(--space-5);padding-top:var(--space-5);flex-wrap:wrap;margin-top:auto;font-weight:800;display:flex}.grade-card__links[data-astro-cid-3higsh67] a[data-astro-cid-3higsh67]{min-height:var(--touch-target);padding-inline:var(--space-2);color:var(--primary-2);text-underline-offset:.2em;align-items:center;display:inline-flex}.grade-handoff[data-astro-cid-3higsh67]{justify-content:space-between;align-items:center;gap:var(--space-6);margin-top:var(--space-12);padding:var(--space-8);border:2px solid var(--ink);border-radius:var(--radius-5);background:var(--paper);box-shadow:var(--key-edge);display:flex}.grade-handoff[data-astro-cid-3higsh67] h2[data-astro-cid-3higsh67]{margin-top:var(--space-2);font-size:var(--fs-h3)}.grade-handoff[data-astro-cid-3higsh67] p[data-astro-cid-3higsh67]:last-child{max-width:52ch;margin-top:var(--space-2);color:var(--ink-2)}.grade-handoff[data-astro-cid-3higsh67]>div[data-astro-cid-3higsh67]:last-child{gap:var(--space-3);flex-wrap:wrap;display:flex}@media (width<=42rem){.grade-start[data-astro-cid-3higsh67]{padding:var(--space-6);flex-direction:column;align-items:flex-start}.grade-resources__grid[data-astro-cid-3higsh67]{grid-template-columns:minmax(0,1fr)}.grade-handoff[data-astro-cid-3higsh67]{padding:var(--space-6);flex-direction:column;align-items:flex-start}}