@keyframes mathmaster-shake{0%,to{transform:translate(0)}20%{transform:translate(-4px)}40%{transform:translate(4px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}@keyframes mathmaster-pop{0%{transform:scale(1)}50%{transform:scale(1.15)}to{transform:scale(1)}}@keyframes mathmaster-overlay-in{0%{opacity:0;transform:scale(.85)}80%{opacity:1;transform:scale(1.02)}to{opacity:1;transform:scale(1)}}@keyframes mathmaster-overlay-in-reduced{0%{opacity:0}to{opacity:1}}@media (prefers-reduced-motion:reduce){.mathmaster-shake{background-color:var(--mathmaster-wrong-bg);transition:background-color .2s;animation:none}@keyframes mathmaster-pop-reduced{0%{transform:scale(1)}50%{transform:scale(1.06)}to{transform:scale(1)}}.mathmaster-pop{animation:.1s ease-in-out mathmaster-pop-reduced}.mathmaster-overlay-in{animation:.2s linear mathmaster-overlay-in-reduced}}.mm-card{--font-display:var(--mathmaster-font-display);--font-mono:var(--mathmaster-font-mono);font-family:var(--mathmaster-font-display);position:relative;overflow:visible}@media (width<=480px){.mm-explanations-toggle-capsule--on{background:#fef3c7eb;border-color:#eab3088c}.mm-explanations-toggle-capsule--off{background:#f8f6f0e6;border-color:#78644647}}@media (prefers-reduced-motion:reduce){.mm-glossary-body-wrap{transition:none}}@media (width>=744px){.mm-title{font-size:24px}.mm-question-card{padding:28px 28px 32px}.mm-choices{gap:12px}.mm-modal{max-width:480px}}@media (width>=1024px){.mm-modal{max-width:520px}}:root{--mathmaster-cream-bg:var(--cream-100);--mathmaster-card-bg:#fff;--mathmaster-card-shadow:0 2px 8px #00000014;--mathmaster-choice-shadow:0 4px 8px #0000000f;--mathmaster-stroke-idle:#e5e5e5;--mathmaster-brown-accent:#7a5a11;--mathmaster-text-dark:var(--brown-ink);--mathmaster-selected-bg:#fef3c7;--mathmaster-correct-bg:#dcfce7;--mathmaster-correct-stroke:#4ade80;--mathmaster-correct-badge:#14693a;--mathmaster-wrong-bg:#fee2e2;--mathmaster-wrong-stroke:#ef4444;--mathmaster-wrong-text:#b91c1c;--mathmaster-glossary-blue:#2563eb;--mathmaster-toggle-on-fg:#9a4503;--mathmaster-toggle-off-fg:#5c5c5c;--mathmaster-letter-badge-bg:#00000012;--mathmaster-letter-badge-fg:#4b5563;--mathmaster-overlay-dim:#000000b3;--mathmaster-lightbulb-yellow:#eab308;--mathmaster-font-display:ui-rounded, "SF Pro Rounded", "Nunito", "Arial Rounded MT Bold", -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", Roboto, sans-serif;--mathmaster-font-mono:ui-rounded, "SF Pro Rounded", "Nunito", "Arial Rounded MT Bold", -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", Roboto, sans-serif}.mathmaster-shake{animation:.2s linear mathmaster-shake}.mathmaster-pop{animation:.35s cubic-bezier(.68,-.55,.27,1.55) mathmaster-pop}.mathmaster-overlay-in{animation:.35s cubic-bezier(.34,1.56,.64,1) mathmaster-overlay-in}.mathmaster-overlay-in-reduced{animation:.2s linear mathmaster-overlay-in-reduced}@media (prefers-reduced-motion:reduce){.mathmaster-shake{background-color:var(--mathmaster-wrong-bg);transition:background-color .2s;animation:none}@keyframes mathmaster-pop-reduced{0%{transform:scale(1)}50%{transform:scale(1.06)}to{transform:scale(1)}}.mathmaster-pop{animation:.1s ease-in-out mathmaster-pop-reduced}.mathmaster-overlay-in{animation:.2s linear mathmaster-overlay-in-reduced}}.mm-card{--font-display:var(--mathmaster-font-display);--font-mono:var(--mathmaster-font-mono);font-family:var(--mathmaster-font-display);position:relative;overflow:visible}.mm-card .game-shell-title,.mm-card .game-shell-pills-row,.mm-card .game-shell-sub-header,.mm-card .game-shell-content{font-family:var(--mathmaster-font-display)}.mm-port-frame{--mm-single-choice-height:clamp(44px, 56px, 58px);--mm-single-choice-gap:clamp(5px, 7px, 8px);flex-direction:column;flex:auto;width:100%;min-height:0;display:flex;position:relative}.mm-title{color:var(--mathmaster-brown-accent)}.mm-progress-badge{font-family:var(--font-display);letter-spacing:.04em;color:var(--mathmaster-brown-accent);background:var(--mathmaster-card-bg);white-space:nowrap;font-variant-numeric:tabular-nums;border:1px solid #8b691440;border-radius:999px;padding:4px 10px;font-size:14px;font-weight:700;line-height:1}.mm-streak-chip{font-family:var(--font-display);color:var(--mathmaster-brown-accent);background:var(--mathmaster-card-bg);white-space:nowrap;border:1px solid #8b691440;border-radius:999px;padding:4px 10px;font-size:13px;font-weight:700;line-height:1}.mm-tagline{font-family:var(--font-body);color:rgba(var(--brown-ink-rgb), .85);margin:0 0 14px;font-size:13px}.mm-feedback-mount{z-index:5;pointer-events:none;justify-content:center;align-items:flex-start;max-width:100%;height:32px;min-height:32px;margin:0 0 7px;display:flex;position:relative}.mm-feedback-mount>*{white-space:normal;max-width:90%}.mm-question-card{background:var(--mathmaster-card-bg);box-shadow:var(--mathmaster-card-shadow);border-radius:16px;flex:auto;justify-content:center;align-items:center;min-height:120px;margin:clamp(6px,1.5%,12px) 0 0;padding:22px 30px;display:flex;overflow:hidden}.mm-port-frame--single-col .mm-question-card{padding:20px 26px}.mm-question-fit-frame{justify-content:center;align-items:center;width:100%;height:100%;min-height:0;display:flex;overflow:hidden}.mm-question-fit-content{width:max-content;max-width:none;transform:scale(var(--mm-question-fit-scale,1));transform-origin:50%;will-change:transform;justify-content:center;align-items:center;display:flex}.mm-question{text-align:center;color:var(--mathmaster-text-dark);flex-direction:column;align-items:center;gap:8px;display:flex}.mm-question-equation{font-family:var(--mathmaster-font-mono);font-feature-settings:"tnum" 1;color:var(--mathmaster-text-dark);font-size:36px;font-weight:800;line-height:1.15}.mm-question-equation--stack{flex-direction:column;gap:.04em;display:flex}.mm-question-equation-line{white-space:nowrap;display:block}.mm-question-substitute{font-family:var(--mathmaster-font-mono);font-feature-settings:"tnum" 1;align-items:baseline;gap:6px;font-size:32px;font-weight:800;line-height:1.15;display:inline-flex}.mm-question-x{color:var(--mathmaster-brown-accent)}.mm-question-eq{color:var(--mathmaster-brown-accent);opacity:.55}.mm-question-pick{color:var(--mathmaster-brown-accent)}.mm-question--linearEquation .mm-question-equation{font-size:36px}.mm-question--equationEquals .mm-question-equation{font-size:42px}.mm-question--fillBlank .mm-question-equation{font-size:28px}.mm-question--plain-xs .mm-question-equation{font-size:18px}.mm-question--plain-sm .mm-question-equation{font-size:21px}.mm-question--plain-md .mm-question-equation{font-size:24px}.mm-question--plain-lg .mm-question-equation{font-size:28px}.mm-question--structured,.mm-question--wordproblem,.mm-question--prose{gap:10px}.mm-q-prompt,.mm-q-followup{font-family:var(--font-display);color:var(--mathmaster-text-dark);text-wrap:balance;max-width:18ch;font-size:18px;font-weight:600;line-height:1.25}.mm-q-prose-body{font-family:var(--font-display);color:var(--mathmaster-text-dark);text-wrap:balance;max-width:17ch;font-size:19px;font-weight:600;line-height:1.3}.mm-q-eq{font-family:var(--mathmaster-font-mono);font-feature-settings:"tnum" 1;color:var(--mathmaster-text-dark);font-weight:800}.mm-q-eq--stack{flex-direction:column;align-items:center;gap:.12em;display:flex}.mm-q-line{font-size:36px;line-height:1.15}.mm-q-line--bare{white-space:nowrap}.mm-q-line--split{white-space:nowrap;flex-direction:column;align-items:center;gap:.04em;display:flex}.mm-q-line--prose,.mm-q-line--prosemath{font-family:var(--font-display);white-space:normal;text-wrap:balance;max-width:17ch;font-size:19px;font-weight:600;line-height:1.3}.mm-choices{flex:none;gap:12px;min-height:0;margin:clamp(8px,1.8%,14px) 0 18px;display:grid}.mm-choices--two-col{grid-template-columns:1fr 1fr}.mm-choices--single-col{gap:var(--mm-single-choice-gap);grid-template-columns:1fr;grid-auto-rows:var(--mm-single-choice-height);margin-bottom:12px}.mm-choices--pyramid{grid-template-columns:1fr 1fr}.mm-choices--pyramid>.mm-choice:nth-child(3){grid-column:1/span 2;justify-self:center;width:calc(50% - 6px);max-width:none}.mm-choice{background:var(--mathmaster-card-bg);border:2px solid var(--mathmaster-stroke-idle);box-shadow:var(--mathmaster-choice-shadow);min-height:80px;font-family:var(--mathmaster-font-mono);font-feature-settings:"tnum" 1;color:var(--mathmaster-text-dark);cursor:pointer;text-align:center;border-radius:16px;justify-content:center;align-items:center;padding:16px 12px 12px;font-weight:800;transition:background .15s,border-color .15s,transform .15s;display:flex;position:relative}.mm-choice:focus-visible{outline:3px solid var(--mathmaster-brown-accent);outline-offset:2px}.mm-choice:disabled{cursor:default}.mm-choice:hover:not(:disabled){border-color:var(--mathmaster-brown-accent)}.mm-choice-text{word-break:break-word;display:inline-block}.mm-choice--len-short .mm-choice-text{font-size:36px}.mm-choice--len-medium .mm-choice-text{font-size:28px}.mm-choice--len-long .mm-choice-text{font-size:22px}.mm-choice--len-xlong .mm-choice-text{font-size:16px}.mm-choice--len-medium,.mm-choice--len-long,.mm-choice--len-xlong{min-height:80px}.mm-choice--len-short{min-height:90px}[data-game-shell][data-mm] .mm-choices--single-col .mm-choice,[data-game-shell][data-mm] .mm-choices--single-col .mm-choice--len-short,[data-game-shell][data-mm] .mm-choices--single-col .mm-choice--len-medium,[data-game-shell][data-mm] .mm-choices--single-col .mm-choice--len-long,[data-game-shell][data-mm] .mm-choices--single-col .mm-choice--len-xlong{height:var(--mm-single-choice-height);min-height:0;padding:12px 12px 10px}[data-game-shell][data-mm] .mm-choices--single-col .mm-choice--len-short .mm-choice-text{font-size:28px}[data-game-shell][data-mm] .mm-choices--single-col .mm-choice--len-medium .mm-choice-text{font-size:26px}[data-game-shell][data-mm] .mm-choices--single-col .mm-choice--len-long .mm-choice-text{font-size:20px}.mm-choice--selected{background:var(--mathmaster-selected-bg);border-color:var(--mathmaster-brown-accent)}.mm-choice--correct{background:var(--mathmaster-correct-bg);border-color:var(--mathmaster-correct-stroke)}.mm-choice--wrong{background:var(--mathmaster-wrong-bg);border-color:var(--mathmaster-wrong-stroke)}.mm-letter-badge{background:var(--mathmaster-letter-badge-bg);width:24px;height:24px;color:var(--mathmaster-letter-badge-fg);font-family:var(--font-display);pointer-events:none;border:1px solid #00000014;border-radius:999px;justify-content:center;align-items:center;font-size:11px;font-weight:700;display:flex;position:absolute;top:8px;left:8px}.mm-explanations-toggle{width:100%;font-family:var(--font-display);cursor:pointer;border:1px solid #fff9;border-radius:16px;justify-content:center;align-items:center;gap:8px;padding:14px 16px;font-size:15px;font-weight:600;transition:background .2s,color 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#0000001f}.mm-explanations-toggle-icon:hover{transform:scale(1.05)}.mm-explanations-toggle-icon:focus-visible{outline:3px solid var(--mathmaster-brown-accent);outline-offset:2px}.mm-explanations-toggle-capsule{box-sizing:border-box;width:100%;min-height:48px;font-family:var(--font-display);cursor:pointer;-webkit-tap-highlight-color:transparent;border:1px solid #fff9;border-radius:16px;flex:none;justify-content:center;align-items:center;gap:8px;margin-bottom:clamp(16px,5%,30px);padding:14px 16px;font-size:15px;font-weight:600;transition:background .2s,color .2s,border-color .2s;display:flex;box-shadow:0 2px 4px #0000000d}.mm-explanations-toggle-capsule--on{color:var(--mathmaster-toggle-on-fg);background:#fef3c780;border-color:#eab30873}.mm-explanations-toggle-capsule--off{color:var(--mathmaster-toggle-off-fg);background:#f5f5f54d;border-color:#fff9}@media 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8px;font-size:13px;font-weight:700}.mm-card{position:relative}.mm-sup{letter-spacing:0;font-feature-settings:"tnum" 0;font-variant-numeric:normal;white-space:nowrap;vertical-align:baseline;font-family:inherit;font-size:.6em;line-height:1;display:inline;position:relative;top:-.5em}.mm-overlay-dim{background:var(--mathmaster-overlay-dim);z-index:100;overscroll-behavior:contain;border-radius:inherit;justify-content:center;align-items:flex-start;padding:clamp(10px,2.4vh,16px);display:flex;position:absolute;inset:0;overflow:hidden}.mm-modal{background:var(--mathmaster-card-bg);width:100%;max-width:min(100%,440px);color:var(--mathmaster-text-dark);overscroll-behavior:contain;border-radius:20px;flex-direction:column;height:100%;max-height:100%;margin-top:0;margin-bottom:0;padding:20px 20px 0;display:flex;overflow:hidden;box-shadow:0 12px 48px #00000040}.mm-modal-header{flex:none;align-items:center;gap:10px;margin-bottom:14px;display:flex}.mm-modal-bulb{color:var(--mathmaster-lightbulb-yellow);flex:none;width:22px;height:22px}.mm-modal-h{font-family:var(--font-display);color:var(--mathmaster-text-dark);margin:0;font-size:20px;font-weight:700}.mm-divider{background:#00000014;flex:none;height:1px;margin:0 0 16px}.mm-modal-scroll-wrap{flex:auto;min-height:0;position:relative;overflow:hidden}.mm-modal-scroll{overscroll-behavior:contain;-webkit-overflow-scrolling:touch;height:100%;padding:0 2px 14px;overflow-y:auto}.mm-modal-scroll-content{min-height:100%}.mm-modal-scroll-wrap[data-scroll-more=true]:after{background:linear-gradient(to bottom, transparent, var(--mathmaster-card-bg) 82%);content:"";pointer-events:none;height:3rem;position:absolute;bottom:0;left:0;right:0}.mm-modal-scroll-more{z-index:1;width:1.5rem;height:1.5rem;color:var(--mathmaster-brown-accent);background:var(--mathmaster-card-bg);border:1px solid rgba(var(--brown-ink-rgb), .14);box-shadow:0 1px 3px rgba(var(--brown-ink-rgb), .12);pointer-events:none;border-radius:50%;place-items:center;display:grid;position:absolute;bottom:.1rem;right:50%;transform:translate(50%)}.mm-modal-scroll-more svg{width:1rem;height:1rem}.mm-modal-footer{background:var(--mathmaster-card-bg);border-top:1px solid #00000014;flex:none;margin:0 -20px;padding:12px 20px 18px;box-shadow:0 -8px 16px #ffffffeb}.mm-context{font-family:var(--mathmaster-font-mono);font-feature-settings:"tnum" 1;color:var(--mathmaster-text-dark);text-align:center;margin:4px 0 14px;font-size:22px;font-weight:800;line-height:1.25}.mm-context .lhs{color:var(--mathmaster-text-dark)}.mm-context .ph{color:var(--mathmaster-brown-accent);opacity:.85}.mm-context .eq{color:var(--mathmaster-brown-accent);opacity:.55}.mm-grade-label{font-family:var(--font-display);color:rgba(var(--brown-ink-rgb), .78);margin:0 0 8px;font-size:14px;font-weight:500}.mm-grade{flex-direction:column;gap:6px;margin-bottom:18px;display:flex}.mm-grade-row{border-radius:8px;grid-template-columns:24px auto 1fr auto;align-items:center;gap:8px;padding:6px 4px;display:grid}.mm-grade-row .gb{background:var(--mathmaster-letter-badge-bg);width:24px;height:24px;color:var(--mathmaster-letter-badge-fg);font-family:var(--font-display);border:1px solid #00000014;border-radius:999px;flex-shrink:0;grid-column:1;justify-content:center;align-items:center;font-size:11px;font-weight:700;display:flex}.mm-grade-row .gtext{font-family:var(--font-mono);font-feature-settings:"tnum" 1;grid-column:2;min-width:0;font-size:17px;font-weight:700}.mm-grade-row .mm-grade-status,.mm-grade-row .mm-grade-icon.dot{grid-column:4;justify-self:end}.mm-grade-row.is-correct .gtext{color:var(--mathmaster-correct-badge);font-weight:800}.mm-grade-row.is-correct{background:#dcfce780}.mm-grade-row.is-wrong 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18px;padding:0;list-style:none;display:flex}.mm-steps li{font-family:var(--font-body);color:var(--mathmaster-text-dark);padding-left:24px;font-size:15px;line-height:1.45;position:relative}.mm-steps li:before{content:"•";color:var(--mathmaster-brown-accent);text-align:left;width:16px;font-size:18px;font-weight:800;line-height:1.3;position:absolute;top:0;left:0}.glossary-link{color:var(--mathmaster-glossary-blue,#2563eb);font:inherit;text-underline-offset:2px;cursor:pointer;vertical-align:middle;background:0 0;border:0;justify-content:center;align-items:center;min-width:44px;min-height:44px;margin:0;padding:0;font-weight:600;text-decoration:underline;display:inline-flex}.glossary-link:hover{text-decoration-thickness:2px}.glossary-link:focus-visible{outline:2px solid 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