._9RREXW_workshop{--color-brand:var(--color-subject-math,#7c3aed);--color-brand-hover:#5b21b6;--color-brand-soft:#ede9fe;--color-accent:#b9e270;--color-accent-ink:#233311;min-width:0}._9RREXW_workshopBody{grid-template-columns:236px minmax(0,1fr);display:grid}._9RREXW_sidebar{background:var(--color-dark);color:var(--color-on-dark);flex-direction:column;gap:24px;padding:32px 24px;display:flex}._9RREXW_sidebarHeading>span{letter-spacing:.14em;color:var(--color-accent);font-size:11px}._9RREXW_sidebarHeading h2{letter-spacing:-.02em;margin-top:12px;font-size:21px;font-weight:600;line-height:1.45}._9RREXW_topicLabel{color:var(--color-on-dark-muted);font-size:13px;line-height:1.7}._9RREXW_steps{gap:24px;margin-top:16px;padding:0;list-style:none;display:grid}._9RREXW_steps li{color:var(--color-on-dark-muted);align-items:center;gap:12px;font-size:13px;display:flex}._9RREXW_steps li>span:first-child{border:1px solid var(--color-on-dark-muted);border-radius:50%;flex:0 0 28px;place-items:center;height:28px;font-size:12px;display:grid}._9RREXW_steps li[aria-current]{color:var(--color-on-dark)}._9RREXW_steps li[aria-current]>span:first-child{background:var(--color-accent);border-color:var(--color-accent);color:var(--color-accent-ink)}._9RREXW_sidebarGuide{color:var(--color-on-dark-muted);gap:12px;margin-top:16px;font-size:14px;line-height:1.5;display:grid}._9RREXW_sidebarFoot{color:var(--color-on-dark-muted);align-items:center;gap:8px;margin-top:auto;padding-top:48px;font-size:13px;display:flex}._9RREXW_sidebar ._9RREXW_textButton{color:var(--color-on-dark);justify-content:flex-start;padding-left:0}._9RREXW_workspace{min-width:0;padding:24px 0}._9RREXW_exerciseTop{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:28px;display:flex}._9RREXW_modeTag{border-radius:var(--radius-sm);background:var(--color-brand-soft);color:var(--color-brand);align-items:center;gap:8px;padding:6px 10px;font-size:12px;line-height:1.5;display:inline-flex}._9RREXW_questionCount{color:var(--color-text-muted);white-space:nowrap;font-size:13px}._9RREXW_exerciseTitle{text-align:center;letter-spacing:-.03em;scroll-margin-top:96px;font-size:32px;font-weight:600;line-height:1.25}._9RREXW_prompt{text-align:center;color:var(--color-text-muted);margin-top:12px;font-size:15px;line-height:1.7}._9RREXW_problemSurface{flex-direction:column;align-items:center;min-width:0;margin:16px 0;padding:16px 0;display:flex}._9RREXW_expression{font-variant-numeric:tabular-nums;letter-spacing:-.04em;justify-content:center;align-items:center;gap:20px;font-size:64px;font-weight:600;line-height:1.2;display:flex}._9RREXW_operator{color:var(--color-text-muted);font-size:36px;font-weight:400}._9RREXW_result{color:var(--color-brand)}._9RREXW_model{width:100%;margin-top:28px;container-type:inline-size}._9RREXW_modelGroups{justify-content:center;justify-items:center;gap:16px;display:grid}._9RREXW_counterGroup{flex-direction:column;justify-content:center;align-items:center;gap:12px;min-width:0;display:flex}._9RREXW_tenFrame{--slot-size:44px;--chip-size:38px;grid-template-columns:repeat(5, var(--slot-size));border:1px solid var(--color-text-muted);border-radius:var(--radius-md);background:var(--color-surface);gap:6px;padding:10px;display:grid}._9RREXW_slot{width:var(--slot-size);height:var(--slot-size);border:1px dashed var(--color-text-muted);border-radius:50%;place-items:center;display:grid}._9RREXW_originalCounter,._9RREXW_addedCounter,._9RREXW_sourceCounter,._9RREXW_counterGhost{width:var(--chip-size,38px);height:var(--chip-size,38px);border-radius:50%;flex-shrink:0;display:block}._9RREXW_originalCounter{background:var(--color-brand);border:1px solid var(--color-brand)}._9RREXW_addedCounter,._9RREXW_sourceCounter{background:var(--color-accent);border:1px solid var(--color-accent-ink)}._9RREXW_addedCounter{animation:.18s ease-out _9RREXW_counter-arrive}._9RREXW_counterGhost{border:1px dashed var(--color-text-muted);background:var(--color-surface)}._9RREXW_modelArrow{width:20px;height:20px;color:var(--color-text-muted);transform:rotate(-90deg)}._9RREXW_extraCounters{grid-template-columns:repeat(4,44px);justify-content:center;gap:4px;display:grid}._9RREXW_counterButton{cursor:pointer;background:0 0;border:0;border-radius:50%;place-items:center;width:44px;height:44px;padding:0;display:grid}._9RREXW_counterButton:disabled{cursor:default}._9RREXW_counterButton:not(:disabled):hover ._9RREXW_sourceCounter{transform:translateY(-3px)}._9RREXW_counterLabel{color:var(--color-text-muted);font-variant-numeric:tabular-nums;font-size:13px}._9RREXW_modelActions{text-align:center;flex-wrap:wrap;justify-content:center;align-items:center;gap:12px;margin-top:16px;display:flex}._9RREXW_modelInstruction{color:var(--color-text-muted);max-width:300px;font-size:13px;line-height:1.6}._9RREXW_decomposition{text-align:center;font-variant-numeric:tabular-nums;overflow-wrap:anywhere;margin-top:20px;font-size:18px;font-weight:500;line-height:1.8}._9RREXW_decomposition>span{border-radius:var(--radius-sm);background:var(--color-accent);color:var(--color-accent-ink);padding:2px 5px}._9RREXW_primaryButton,._9RREXW_secondaryButton{border-radius:var(--radius-md);background:var(--color-brand);min-height:48px;color:var(--color-surface);cursor:pointer;border:1px solid #0000;justify-content:center;align-items:center;gap:10px;padding:12px 20px;font-size:15px;font-weight:600;line-height:1.5;display:inline-flex}._9RREXW_primaryButton:hover:not(:disabled){background:var(--color-brand-hover)}._9RREXW_primaryButton:disabled{opacity:.45;cursor:default}._9RREXW_secondaryButton{background:var(--color-surface);border-color:var(--color-border);color:var(--color-text)}._9RREXW_secondaryButton:hover{background:var(--color-bg)}._9RREXW_textButton{border-radius:var(--radius-sm);min-height:44px;color:var(--color-brand);cursor:pointer;text-align:left;background:0 0;border:0;justify-content:center;align-items:center;gap:8px;padding:8px;font-size:13px;line-height:1.5;display:inline-flex}._9RREXW_textButton:hover:not(:disabled):not([aria-disabled=true]){text-underline-offset:4px;text-decoration:underline}._9RREXW_textButton:disabled,._9RREXW_textButton[aria-disabled=true]{opacity:.5;cursor:default}._9RREXW_modelReveal{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);min-height:44px;color:var(--color-text-muted);cursor:pointer;align-items:center;gap:8px;margin-top:24px;padding:8px 12px;font-size:13px;display:inline-flex}._9RREXW_answerForm{margin-top:24px}._9RREXW_answerLabel{text-align:center;color:var(--color-text-muted);margin-bottom:8px;font-size:14px;display:block}._9RREXW_answerRow{flex-wrap:wrap;justify-content:center;align-items:center;gap:12px;display:flex}._9RREXW_answerInput{border:1px solid var(--color-text-muted);border-radius:var(--radius-md);background:var(--color-surface);width:100px;min-height:52px;color:var(--color-text);text-align:center;font-variant-numeric:tabular-nums;padding:8px 12px;font-size:26px;line-height:1.25}._9RREXW_answerInput[aria-invalid=true]{border-color:var(--color-danger)}._9RREXW_validation{color:var(--color-danger);margin-top:12px;font-size:14px;line-height:1.6}._9RREXW_answerFeedback{color:var(--color-text-muted);margin-top:16px;font-size:14px;line-height:1.7}._9RREXW_hintActions{flex-wrap:wrap;justify-content:center;align-items:center;gap:16px;margin-top:16px;display:flex}._9RREXW_assistanceNote{color:var(--color-text-muted);font-size:12px}._9RREXW_hint{background:var(--color-brand-soft);border-radius:var(--radius-md);margin-top:12px;padding:16px 20px;font-size:14px;line-height:1.7}._9RREXW_hint strong{color:var(--color-brand);margin-bottom:4px;font-size:12px;font-weight:600;display:block}._9RREXW_successBlock{flex-direction:column;align-items:center;gap:20px;display:flex}._9RREXW_successBlock>p{color:var(--color-text);border-radius:var(--radius-md);justify-content:center;align-items:flex-start;gap:10px;width:100%;padding:16px;font-size:15px;line-height:1.7;display:flex}._9RREXW_successBlock svg{flex-shrink:0}._9RREXW_successBlock>p>svg{color:color-mix(in srgb, var(--color-success) 65%, var(--color-text));margin-top:3px}._9RREXW_roundProgress{justify-content:center;gap:8px;margin-top:32px;display:flex}._9RREXW_roundProgress>span{background:var(--color-border);border-radius:4px;flex:1;max-width:44px;height:6px}._9RREXW_roundProgress>._9RREXW_progressCurrent{background:var(--color-text-faint)}._9RREXW_roundProgress>._9RREXW_progressDone{background:var(--color-brand)}._9RREXW_welcome>h2{letter-spacing:-.04em;margin-top:24px;font-size:36px;font-weight:600;line-height:1.25}._9RREXW_welcome>p{color:var(--color-text-muted);max-width:560px;margin-top:16px;font-size:15px;line-height:1.8}._9RREXW_welcomeDrawing{background:var(--color-bg);border-radius:var(--radius-lg);flex-wrap:wrap;justify-content:center;align-items:center;gap:20px;margin-top:28px;padding:28px 16px;display:flex}._9RREXW_welcomeFrame{--chip-size:30px;border:1px solid var(--color-text-muted);border-radius:var(--radius-md);background:var(--color-surface);grid-template-columns:repeat(5,30px);gap:6px;padding:10px;display:grid}._9RREXW_welcomePlus{color:var(--color-text-muted);font-size:28px}._9RREXW_welcomeRemainder{--chip-size:30px;gap:6px;display:flex}._9RREXW_welcomeEquation{text-align:center;font-variant-numeric:tabular-nums;flex-basis:100%;font-size:18px;font-weight:500}._9RREXW_resume{background:var(--color-accent-soft);border-radius:var(--radius-md);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-top:24px;padding:20px;display:flex}._9RREXW_resume strong{font-size:15px;font-weight:600}._9RREXW_resume p{color:var(--color-text-muted);margin-top:4px;font-size:13px;line-height:1.6}._9RREXW_modeChoices{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:24px;display:grid}._9RREXW_modeChoice{border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);min-height:168px;color:var(--color-text);cursor:pointer;text-align:left;flex-direction:column;align-items:flex-start;gap:12px;padding:20px;display:flex;position:relative}._9RREXW_modeChoice:hover{border-color:var(--color-brand);background:var(--color-brand-soft)}._9RREXW_modeChoice>svg:first-child{color:var(--color-brand)}._9RREXW_modeChoice>strong{font-size:16px;font-weight:600;line-height:1.5}._9RREXW_modeChoice>span{color:var(--color-text-muted);padding-right:16px;font-size:13px;line-height:1.6}._9RREXW_modeChoice>svg:last-child{color:var(--color-brand);position:absolute;bottom:20px;right:16px}._9RREXW_welcome>._9RREXW_welcomeFoot{font-size:13px}._9RREXW_summaryMark{background:var(--color-accent);width:60px;height:60px;color:var(--color-accent-ink);border-radius:var(--radius-lg);place-items:center;display:grid}._9RREXW_summary h2{letter-spacing:-.03em;text-align:center;margin-top:24px;font-size:30px;font-weight:600;line-height:1.3}._9RREXW_summary>p{text-align:center;color:var(--color-text-muted);margin-top:16px;font-size:15px;line-height:1.8}._9RREXW_summaryStats{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:8px;padding:24px 0;display:grid}._9RREXW_summaryStats>div{flex-direction:column;gap:8px;display:flex}._9RREXW_summaryStats strong{font-variant-numeric:tabular-nums;font-size:36px;font-weight:600;line-height:1.3}._9RREXW_summaryStats small{color:var(--color-text-muted);font-size:18px;font-weight:400}._9RREXW_summaryStats span{color:var(--color-text-muted);font-size:13px;line-height:1.6}._9RREXW_solutionDetails{border-top:1px solid var(--color-border);border-bottom:1px solid var(--color-border);margin-top:24px}._9RREXW_solutionDetails summary,._9RREXW_history summary{cursor:pointer;min-height:48px;padding:16px 0;font-size:14px;font-weight:600}._9RREXW_solutionDetails li{border-top:1px solid var(--color-border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;padding:12px 0;display:flex}._9RREXW_solutionDetails li>span{font-variant-numeric:tabular-nums;font-size:18px;font-weight:500}._9RREXW_solutionDetails small{color:var(--color-text-muted);font-size:12px;line-height:1.6}._9RREXW_summaryActions{flex-wrap:wrap;gap:12px;margin-top:24px;display:flex}._9RREXW_summary>._9RREXW_summaryNote{align-items:flex-start;gap:8px;font-size:13px;display:flex}._9RREXW_summaryNote svg{flex-shrink:0;margin-top:4px}._9RREXW_history{border-top:1px solid var(--color-border);margin-top:32px}._9RREXW_history summary>span{color:var(--color-text-muted);margin-left:8px;font-weight:400}._9RREXW_history ul{padding:0;list-style:none}._9RREXW_history li{border-bottom:1px solid var(--color-border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:12px 0;display:flex}._9RREXW_history li>div{flex-direction:column;gap:4px;display:flex}._9RREXW_history strong{font-size:14px;font-weight:500;line-height:1.6}._9RREXW_history li span,._9RREXW_history>p{color:var(--color-text-muted);font-size:12px;line-height:1.7}._9RREXW_history>p{margin-top:12px}._9RREXW_saveArea{border-top:1px solid var(--color-border);background:var(--color-bg);padding:12px 24px}._9RREXW_saveLine{color:var(--color-text-muted);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 16px;font-size:12px;display:flex}._9RREXW_saveLine>span{align-items:center;gap:8px;line-height:1.7;display:flex}._9RREXW_saveLine svg{flex-shrink:0}._9RREXW_saveLine>a{min-height:44px;color:var(--color-brand);text-underline-offset:4px;align-items:center;text-decoration:underline;display:inline-flex}._9RREXW_saveLine>._9RREXW_saveWarning{color:var(--color-danger)}._9RREXW_storageNotice{color:var(--color-text-muted);margin-top:8px;font-size:12px;line-height:1.6}._9RREXW_guestImport{border-top:1px solid var(--color-border);color:var(--color-text-muted);flex-wrap:wrap;align-items:center;gap:8px 16px;margin-top:12px;padding-top:8px;font-size:12px;display:flex}._9RREXW_loading{border-radius:var(--radius-xl);background:var(--color-surface);min-height:480px;color:var(--color-text-muted);place-items:center;display:grid}._9RREXW_workshop :is(button,input,a,summary):focus-visible{outline:3px solid var(--color-brand);outline-offset:3px}@container (min-width:500px){._9RREXW_modelGroups{grid-template-columns:auto 20px auto;align-items:center;gap:24px}._9RREXW_modelArrow{transform:rotate(180deg)}._9RREXW_extraCounters{grid-template-columns:repeat(3,44px)}}@media (max-width:1023px){._9RREXW_workshopBody{grid-template-columns:200px minmax(0,1fr)}._9RREXW_sidebar{padding:28px 20px}._9RREXW_workspace{padding:28px 24px}._9RREXW_welcome>h2{font-size:30px}}@media (max-width:767px){._9RREXW_workshopBody{grid-template-columns:minmax(0,1fr)}._9RREXW_sidebar{gap:12px;padding:16px 20px}._9RREXW_sidebarHeading h2,._9RREXW_topicLabel,._9RREXW_sidebarGuide,._9RREXW_sidebarFoot{display:none}._9RREXW_sidebarHeading>span{font-size:10px}._9RREXW_sidebar ._9RREXW_textButton{min-height:44px;padding:8px 0}._9RREXW_steps{gap:12px;margin-top:0;display:flex}._9RREXW_steps li{flex:1;align-items:flex-start;gap:6px;font-size:11px;line-height:1.5}._9RREXW_steps li>span:first-child{flex-basis:22px;height:22px;font-size:11px}._9RREXW_workspace{padding:24px 20px}._9RREXW_exerciseTop{margin-bottom:24px}._9RREXW_exerciseTitle{font-size:25px}._9RREXW_welcome>h2{font-size:28px}}@media (max-width:479px){._9RREXW_workspace{padding:24px 16px}._9RREXW_sidebar{padding:12px 16px}._9RREXW_steps li{flex-direction:column;gap:8px}._9RREXW_steps li>span:first-child{flex-basis:auto;width:24px;height:24px}._9RREXW_problemSurface{padding:24px 12px}._9RREXW_expression{gap:12px;font-size:44px}._9RREXW_operator{font-size:28px}._9RREXW_prompt{font-size:14px}._9RREXW_tenFrame{--slot-size:32px;--chip-size:28px;padding:8px}._9RREXW_extraCounters{--chip-size:32px}._9RREXW_counterLabel{font-size:12px}._9RREXW_decomposition{font-size:15px}._9RREXW_answerInput{width:80px}._9RREXW_primaryButton,._9RREXW_secondaryButton{padding:12px 16px;font-size:14px}._9RREXW_modeChoices{grid-template-columns:minmax(0,1fr);gap:12px}._9RREXW_modeChoice{min-height:140px}._9RREXW_welcomeDrawing{grid-template-columns:1fr;justify-items:center;gap:16px;padding:24px 12px;display:grid}._9RREXW_welcomePlus{display:none}._9RREXW_welcomeEquation{font-size:16px}._9RREXW_summary h2{font-size:25px}._9RREXW_summaryStats{grid-template-columns:1fr;gap:16px}._9RREXW_summaryStats>div{flex-direction:row;align-items:center;gap:16px}._9RREXW_summaryStats strong{min-width:88px;font-size:30px}._9RREXW_saveArea{padding:12px 16px}}@keyframes _9RREXW_counter-arrive{0%{transform:scale(.65)}to{transform:scale(1)}}@media (prefers-reduced-motion:reduce){._9RREXW_addedCounter{animation:none}}._9RREXW_srOnly{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}._9RREXW_simpleWelcome{text-align:center;justify-items:center;gap:24px;padding:16px 0 24px;display:grid}._9RREXW_simpleWelcome h2{font-size:26px;font-weight:600}._9RREXW_simpleWelcome p{color:var(--color-text-muted);max-width:360px;font-size:16px;line-height:1.6}._9RREXW_startPreview{border-radius:var(--radius-lg);width:100%;max-width:360px;overflow:clip}._9RREXW_startChoices{justify-items:center;gap:12px;display:grid}._9RREXW_simpleWelcome ._9RREXW_primaryButton{min-width:240px;min-height:56px;font-size:18px}._9RREXW_otherModes>summary,._9RREXW_explanation>summary{min-height:44px;color:var(--color-text-muted);cursor:pointer;padding:12px 0;font-size:14px}._9RREXW_adultPanel{border-top:1px solid 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