@font-face{font-family:Shippori Mincho;font-style:normal;font-display:swap;font-weight:600;src:url(/assets/shippori-mincho-latin-600-normal-6Q85HP94.woff2)format("woff2"),url(/assets/shippori-mincho-latin-600-normal-BtWD08KL.woff)format("woff")}@font-face{font-family:Zen Kaku Gothic New;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/zen-kaku-gothic-new-latin-400-normal-BEdayliK.woff2)format("woff2"),url(/assets/zen-kaku-gothic-new-latin-400-normal-CPSmNJAU.woff)format("woff")}@font-face{font-family:Zen Kaku Gothic New;font-style:normal;font-display:swap;font-weight:700;src:url(/assets/zen-kaku-gothic-new-latin-700-normal-Dgv0FPyh.woff2)format("woff2"),url(/assets/zen-kaku-gothic-new-latin-700-normal-zPVyND5l.woff)format("woff")}:root{--paper:#f4ecd8;--sheet:#fbf7ee;--ink:#1f1b16;--ink-muted:#5e554a;--indigo:#22366e;--shu:#b8321f;--grid:#22366e14;--radius:4px;--font-body:"Zen Kaku Gothic New", system-ui, sans-serif;--font-title:"Shippori Mincho", Georgia, 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var(--ink);border-radius:var(--radius);min-inline-size:0;margin:0;padding:12px}#operations,.generator>fieldset{border:0;padding:0}.generator>fieldset>legend{margin-bottom:4px;padding:0}legend{padding:0 6px;font-weight:700}.options{grid-template-columns:repeat(auto-fit,minmax(min(6rem,100%),1fr));gap:6px;display:grid}.operation-options{grid-template-columns:repeat(auto-fit,minmax(3.25rem,1fr))}.operation-options label{gap:4px;padding:0 4px}.option{display:contents}.option label{overflow-wrap:break-word;background:var(--sheet);border:1px solid var(--ink-muted);border-radius:var(--radius);cursor:pointer;touch-action:manipulation;justify-content:center;align-items:center;gap:8px;min-width:0;min-height:44px;padding:0 8px;font-weight:700;display:flex}.option label:has(input:checked){border-color:var(--indigo);box-shadow:inset 0 0 0 1px var(--indigo)}.option label:has(input:focus-visible){outline:2px solid var(--indigo);outline-offset:2px}.option .hint{order:1;grid-column:1/-1}.option .hint:empty{display:none}.symbol{font:600 1.3rem / 1 var(--font-title);white-space:nowrap;font-variant-numeric:tabular-nums}.operation-options .hint{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.level-options .option:not(:has(input:checked)) .hint{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}input[type=checkbox],input[type=radio]{width:1.2rem;height:1.2rem;accent-color:var(--indigo);flex-shrink:0;margin:0}.hint{overflow-wrap:break-word;color:var(--ink-muted);margin:0;font-size:.9rem;line-height:1.4}.error{color:var(--indigo);margin:0;font-weight:700}.error:empty{display:none}.params-fields{grid-template-columns:repeat(auto-fit,minmax(min(17rem,100%),1fr));gap:12px;padding-top:8px;display:grid}.pair-note{margin-top:8px}.pair-digits{font-weight:600;display:block}.range-field{background:var(--sheet);border-color:var(--ink-muted);grid-template-columns:1fr 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.expected{color:var(--indigo);font-variant-numeric:tabular-nums;text-align:right;grid-area:2/1;padding-right:4px;font-size:1.15rem;font-weight:700}.verdict{text-align:right;margin:2px 0 6px;font-size:.85rem}.result{margin-bottom:8px}.timer{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:8px;display:flex}.timer-button{align-items:center;gap:8px;display:inline-flex}.timer-icon{flex-shrink:0;width:1.1em;height:1.1em}.timer-clock{min-width:4ch;font:600 1.2rem / 1.3 var(--font-title);font-variant-numeric:tabular-nums;margin:0}.score{font:600 1.4rem / 1.3 var(--font-title);margin:0}.result-card{background:var(--sheet);border:1px solid var(--ink);border-radius:var(--radius);box-shadow:3px 3px 0 var(--grid);padding:16px 112px 16px 18px;position:relative}.result-stats{border-top:1px dashed var(--ink-muted);flex-wrap:wrap;gap:12px 28px;margin:12px 0 0;padding-top:12px;display:flex}.stat dt{color:var(--ink-muted);letter-spacing:.06em;text-transform:uppercase;font-size:.8rem}.stat dd{font:600 1.5rem / 1.2 var(--font-title);font-variant-numeric:tabular-nums;margin:0}.seal{width:88px;height:88px;color:var(--shu);font:700 .66rem / 1 var(--font-title);letter-spacing:.02em;text-transform:uppercase;border:4px double var(--shu);outline:1px solid var(--shu);outline-offset:3px;opacity:.9;border-radius:50%;place-items:center;margin-top:-44px;display:grid;position:absolute;top:50%;right:16px;transform:rotate(-14deg)}.seal.failed{letter-spacing:0;color:var(--indigo);border-color:var(--indigo);outline-color:var(--indigo);font-size:.6rem}@media (width<=480px){.result-card{padding-top:92px;padding-right:18px}.seal{letter-spacing:.02em;width:76px;height:76px;margin-top:0;font-size:.62rem;top:12px}.seal.failed{letter-spacing:0;font-size:.54rem}}.section-scores{color:var(--ink-muted);flex-wrap:wrap;gap:0 20px;margin:4px 0 0;padding:0;list-style:none;display:flex}.section-scores a{min-height:44px;color:var(--indigo);text-underline-offset:3px;align-items:center;display:inline-flex}.exam-actions{flex-wrap:wrap;align-items:center;gap:8px;margin-top:16px;display:flex}.exam-actions .hint,#blank-confirm{flex-basis:100%}#blank-confirm{margin:0;font-weight:700}@media (width<=599px){.exam-actions>button{width:100%}}.just-graded .hanamaru{animation:.18s ease-out stamp}@keyframes stamp{0%{transform:scale(1.08)}to{transform:scale(1)}}@media (prefers-reduced-motion:reduce){.just-graded .hanamaru{animation:none}}@media (width<=320px){#app{padding:8px}.sheet{padding:16px 8px 16px 36px}fieldset{padding:8px 6px}.option{padding:0 6px 6px}}.button-secondary{min-height:44px;color:var(--ink);font:700 1rem / 1.2 var(--font-body);background:var(--sheet);border:1px solid var(--ink);border-radius:var(--radius);cursor:pointer;touch-action:manipulation;padding:0 16px}.button-secondary[aria-disabled=true]{color:var(--ink-muted);border-color:var(--ink-muted);cursor:progress}.button-secondary:focus-visible{outline:2px solid var(--indigo);outline-offset:2px}.exam-file{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.exam-file .hint,.exam-file .error{flex-basis:100%}.toggletip{align-self:center;display:inline-flex;position:relative}.toggletip-button{width:24px;height:24px;color:var(--ink-muted);cursor:pointer;touch-action:manipulation;background:0 0;border:0;border-radius:50%;place-items:center;padding:0;display:grid}.toggletip-button>span{width:20px;height:20px;font:600 .8rem / 1 var(--font-body);border:1.5px solid;border-radius:50%;place-items:center;display:grid}.toggletip-button:hover,.toggletip-button[aria-expanded=true]{color:var(--indigo)}.toggletip-button:focus-visible{outline:2px solid var(--indigo);outline-offset:2px}.toggletip-bubble{z-index:20;width:max-content;max-width:min(32ch,100vw - 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var(--indigo);outline-offset:-3px;box-shadow:inset 0 0 0 6px var(--sheet)}.abacus-rod.is-highlighted:after{content:"";pointer-events:none;border:3px dashed #b8321f;border-radius:4px;position:absolute;inset:10px;box-shadow:0 0 0 2px #f4ecd8,0 0 0 3px #2a1e17,inset 0 0 0 2px #f4ecd8,inset 0 0 0 3px #2a1e17}.abacus-bead{transition:transform .2s cubic-bezier(.33,1,.68,1)}@media (prefers-reduced-motion:reduce){.abacus-bead{transition:none}}.abacus-digits{grid-template-columns:repeat(var(--rods), 1fr);padding:6px var(--inset-x) 0;font-variant-numeric:tabular-nums;text-align:center;font-size:1.25rem;line-height:1.4;display:grid}.abacus-digits>.is-unit{font-weight:700;position:relative}.abacus-digits>.is-unit:after{content:attr(data-sep);position:absolute;right:-.15em}.abacus-digits[hidden]{display:none}#abacus-keys{margin-top:12px}#solution-title{scroll-margin-top:8px}.abacus-section.has-solution>.hint,.has-solution .solve-form,.has-solution .abacus-toolbar>:not(.abacus-value),.has-solution 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