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strong{color:var(--ink);font-weight:800}.frac{vertical-align:middle;text-align:center;font-variant-numeric:tabular-nums;flex-direction:column;align-items:stretch;margin:0 .12em;font-size:.92em;line-height:1.05;display:inline-flex}.frac__num{border-bottom:.08em solid;padding:0 .2em .06em}.frac__den{padding:.06em .2em 0}.options{flex-direction:column;gap:.75rem;width:100%;display:flex}.options--tiles{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;display:grid}.option{border-radius:var(--r-md);background:var(--surface);width:100%;min-height:72px;box-shadow:inset 0 0 0 2.5px var(--line), 0 4px 0 var(--line);font-size:var(--fs-md);text-align:left;color:var(--ink);cursor:pointer;transition:background-color var(--dur-2), box-shadow var(--dur-2), opacity var(--dur-2);border:0;align-items:center;gap:1rem;margin-bottom:4px;padding:.75rem 1.1rem;font-weight:700;display:flex;position:relative}.option__label{flex:1;min-width:0}.options--tiles .option{flex-direction:column;justify-content:center;min-height:200px;padding:1rem}.options--tiles .option__label{justify-content:center;display:flex}.options--tiles .option__dot,.options--tiles .option__letter{position:absolute;top:.8rem;left:.8rem}.options--tiles .option__state{position:absolute;top:.7rem;right:.7rem}.option--selected{background:var(--primary-soft);box-shadow:inset 0 0 0 3px var(--primary), 0 4px 0 var(--primary-lip)}.option--correct{background:var(--success-soft);box-shadow:inset 0 0 0 3px var(--success), 0 4px 0 var(--success-lip)}.option--answer{background:var(--success-soft);box-shadow:inset 0 0 0 3px var(--success), 0 4px 0 color-mix(in oklab, var(--success) 50%, white)}.option--wrong{background:var(--error-soft);box-shadow:inset 0 0 0 3px var(--error), 0 4px 0 var(--error-lip)}.option--eliminated{opacity:.5;background:var(--surface-sunk);box-shadow:inset 0 0 0 2px var(--line);cursor:default}.option--eliminated .option__label{text-decoration:line-through;text-decoration-thickness:2px;-webkit-text-decoration-color:var(--error);text-decoration-color:var(--error)}.option[aria-disabled=true]{cursor:default}.option__dot{width:30px;height:30px;box-shadow:inset 0 0 0 3px var(--line-strong);background:var(--surface);transition:box-shadow var(--dur-2), background-color var(--dur-2);border-radius:50%;flex:none}.option__dot.is-on{background:var(--primary);box-shadow:inset 0 0 0 3px var(--primary), inset 0 0 0 7px #fff}.option--correct .option__dot,.option--answer .option__dot{background:var(--success);box-shadow:inset 0 0 0 3px var(--success), inset 0 0 0 7px #fff}.option--wrong .option__dot{background:var(--error);box-shadow:inset 0 0 0 3px var(--error), inset 0 0 0 7px #fff}.option__letter{background:var(--paper-2);width:46px;height:46px;color:var(--ink-2);font-family:var(--font-display);transition:background-color var(--dur-2), color 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0 0 0 2px var(--line), 0 4px 0 var(--line);background-image:repeating-linear-gradient(135deg,#0000 0 9px,#1e1b330d 9px 18px);overflow:hidden}.option--struck .option__label{text-decoration:line-through;text-decoration-thickness:2.5px;-webkit-text-decoration-color:var(--strike,var(--ink-3));text-decoration-color:var(--strike,var(--ink-3))}.option__slash{transform-origin:0;width:calc(100% - 20px);height:calc(100% - 16px);animation:strike-draw .22s var(--ease-out) both;pointer-events:none;position:absolute;inset:8px 10px;overflow:visible}.option__slash line{stroke:var(--strike,var(--ink-3));stroke-width:3px;stroke-linecap:round}@keyframes strike-draw{0%{transform:scaleX(0)}to{transform:scaleX(1)}}html[data-reduce-motion=true] .option__slash{animation:none}@media (prefers-reduced-motion:reduce){.option__slash{animation:none}}.option__letter,.option__dot{position:relative}.option__x{fill:none;width:calc(100% - 8px);height:calc(100% - 8px);stroke:var(--error);stroke-width:1.8px;stroke-linecap:round;opacity:.5;position:absolute;inset:4px}.option--struck .option__letter{background:var(--surface);color:var(--ink-2);box-shadow:inset 0 0 0 2px var(--line-strong)}.strike-btn{width:48px;height:48px;color:var(--ink-2);cursor:pointer;-webkit-touch-callout:none;transition:background-color var(--dur-2), color var(--dur-2), transform 90ms ease-out;background:0 0;border:0;border-radius:14px;flex:none;place-items:center;margin-bottom:4px;padding:0;display:grid}.strike-btn:active:not(:disabled){transform:scale(.9)}@media (hover:hover){.strike-btn:hover:not(:disabled){background:var(--paper-2);color:var(--ink)}}.strike-btn svg{overflow:visible}.strike-btn__ring{fill:var(--surface);stroke:currentColor;stroke-width:2px;stroke-dasharray:3.4 2.6}.strike-btn__letter{fill:currentColor;font-family:var(--font-display);font-size:14px;font-weight:700}.strike-btn__x,.strike-btn__undo{fill:none;stroke:var(--error);stroke-width:2.2px;stroke-linecap:round;stroke-linejoin:round}.strike-btn.is-on{color:#fff}.strike-btn.is-on .strike-btn__ring{fill:var(--ink-3);stroke:var(--ink-3);stroke-dasharray:none}.strike-btn.is-on .strike-btn__letter{display:none}.strike-btn.is-on .strike-btn__undo{stroke:#fff}.strike-btn:disabled{opacity:.3;cursor:default}.strike-btn:disabled.is-on{opacity:.55}.option-notice{font-weight:800;font-size:var(--fs-sm);color:var(--ink-2);flex-basis:100%;align-items:center;gap:.45rem;margin:.1rem 0 .2rem .4rem;display:flex}.option-notice button{background:var(--primary-soft);min-height:44px;color:var(--primary-ink);font:inherit;cursor:pointer;border:0;border-radius:12px;padding:0 .6rem}.strike-tip{z-index:3;background:var(--ink);color:#fff;max-width:min(420px,100%);font-weight:700;font-size:var(--fs-sm);box-shadow:var(--shadow-2);border-radius:14px;align-items:center;gap:.6rem;padding:.45rem .45rem .45rem .9rem;line-height:1.3;display:flex;position:absolute;bottom:calc(100% + 6px);right:0}.strike-tip:after{content:"";border:7px solid #0000;border-top-color:var(--ink);position:absolute;top:100%;right:18px}.strike-tip b{color:#ffb3b5}.strike-tip button{min-height:44px;color:var(--ink);font:inherit;cursor:pointer;background:#fff;border:0;border-radius:10px;flex:none;padding:0 .8rem}.options--strikeable .option-row:first-child:has(.strike-tip){margin-top:3.4rem}.strike-undo-slot:empty{display:none}.strike-undo{border-radius:var(--r-pill);background:var(--ink);color:#fff;font-weight:700;font-size:var(--fs-sm);align-items:center;gap:.6rem;padding:.2rem .25rem .2rem .9rem;display:inline-flex}.strike-undo 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3px var(--success);color:var(--success-ink)}.keypad--wrong .keypad__display{background:var(--error-soft);box-shadow:inset 0 0 0 3px var(--error);color:var(--error-ink)}.keypad__value.is-empty{color:var(--ink-3);opacity:.45}.keypad__caret{vertical-align:-.05em;background:var(--primary);border-radius:2px;width:4px;height:.8em;margin-left:4px;animation:1.05s steps(2,jump-none) infinite caret;display:inline-block}@keyframes caret{0%,50%{opacity:1}50.01%,to{opacity:0}}.keypad__unit{color:var(--ink-2);font-size:.55em}.keypad__status{position:absolute;top:50%;right:1.1rem;translate:0 -50%}.keypad{container-type:inline-size}.keypad__grid{grid-template-columns:repeat(var(--kp-cols,3), minmax(0, 1fr));gap:.6rem;display:grid}.keypad--row .keypad__grid{gap:.6rem .5rem}.key{min-width:0}@container (width<=360px){.keypad--row .keypad__grid{gap:.5rem .35rem}.keypad--row .key__ok-label{display:none}}.key{border-radius:var(--r-md);background:var(--surface);min-height:72px;box-shadow:inset 0 0 0 2px 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var(--line-strong)}.scratch{z-index:40;pointer-events:none;position:fixed;bottom:0;left:0;right:0}.scratch[hidden]{display:none}.scratch.is-open{pointer-events:auto;box-shadow:inset 0 0 0 4px color-mix(in oklab, var(--primary) 35%, transparent);background-color:#5b3df506}.scratch.is-paper{background-color:#fbf8f3f2}.scratch__canvas{pointer-events:none;position:absolute;inset:0}.scratch.is-open .scratch__canvas--live{pointer-events:auto;touch-action:none;cursor:crosshair}.scratch-tools{z-index:41;background:var(--surface);width:fit-content;box-shadow:var(--shadow-3), inset 0 0 0 2px var(--line);border-radius:26px;align-items:center;gap:.4rem;margin:0 auto;padding:.5rem;display:flex;position:fixed;bottom:1.1rem;left:0;right:0}.scratch-tools__sep{background:var(--line);border-radius:2px;width:2px;height:34px;margin:0 .2rem}.swatch{background:var(--sw);width:52px;height:52px;box-shadow:inset 0 0 0 4px #fff, 0 0 0 2px var(--line);cursor:pointer;transition:box-shadow var(--dur-2), transform 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var(--dur-2), transform 80ms;border:0;border-radius:18px;flex:none;align-items:center;gap:.45rem;margin-bottom:3px;padding:0 1.1rem;font-size:1rem;font-weight:600;display:inline-flex;position:relative}.scratch-toggle:active{box-shadow:inset 0 0 0 2px var(--line);transform:translateY(3px)}.scratch-toggle.is-open{background:var(--primary);color:#fff;box-shadow:0 3px 0 var(--primary-lip)}.scratch-toggle__dot{background:var(--primary);border-radius:50%;width:11px;height:11px;position:absolute;top:9px;right:9px;box-shadow:0 0 0 2px #fff}.sheet-root{z-index:800;place-items:center;display:grid;position:fixed;inset:0}.sheet-backdrop{background:#1e1b336b;position:absolute;inset:0}.sheet{border-radius:var(--r-xl);background:var(--surface);width:100%;box-shadow:var(--shadow-3);outline:none;position:relative}.splash{background:var(--paper);flex-direction:column;justify-content:center;align-items:center;gap:1.2rem;display:flex;position:fixed;inset:0}.splash__logo{animation:bloom .9s 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var(--shadow-2);background:#ffd43b;align-items:center;gap:.4rem;margin:0 auto;padding:.45rem 1.1rem .45rem .8rem;font-size:1.25rem;font-weight:600;display:inline-flex;position:absolute;top:84px;left:0;right:0}.xp-pill span{display:inline-block}.toasts{flex-direction:column;align-items:center;gap:.6rem;display:flex;position:absolute;top:14px;left:0;right:0}.toast{border-radius:var(--r-lg);background:var(--ink);color:#fff;box-shadow:var(--shadow-3);align-items:center;gap:.8rem;padding:.7rem 1.4rem .7rem .8rem;display:flex}.toast strong{font-family:var(--font-display);font-size:1.15rem;font-weight:600;display:block}.toast small{opacity:.75;font-size:var(--fs-xs);display:block}.toast__icon{border-radius:50%;place-items:center;width:50px;height:50px;display:grid}.toast--streak .toast__icon{background:var(--flame)}.toast--daily-goal 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