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summary{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--cell);list-style:none;font-weight:700;font-size:17px;cursor:pointer}.faq summary::-webkit-details-marker{display:none}.faq summary .icon{flex:none;width:20px;height:var(--cell);color:var(--pen);transition:transform .2s var(--ease-out)}.faq details[open] summary .icon{transform:rotate(180deg)}.faq summary:hover{color:var(--pen)}.faq details p{margin-top:0;color:var(--ink)}.ad-slot{display:flex;justify-content:center;margin-top:calc(2 * var(--cell));max-width:100%;overflow:hidden}.ad-inner{width:var(--ad-w, 100%);max-width:100%}.ad-label{display:block;font-size:12px;color:var(--ink-soft)}.ad-box{display:flex;justify-content:center;min-height:calc(12 * var(--cell))}.ad-box--wide{min-height:calc(13 * var(--cell))}.ad-placeholder{display:grid;place-items:center;width:100%;min-height:inherit;background:repeating-linear-gradient(-45deg,rgba(31,42,68,.06) 0 8px,transparent 8px 16px);color:var(--ink-soft);font-size:13px}.footer{margin-top:calc(3 * var(--cell));padding-top:var(--cell);padding-bottom:calc(2 * var(--cell));position:relative;font-size:15px}.footer:before{content:"";position:absolute;left:0;right:0;top:-4px;height:6px;border-top:2px solid var(--ink);border-bottom:2px solid var(--ink)}.footer-cols{display:grid;grid-template-columns:1fr;gap:var(--cell) calc(2 * var(--cell))}@media (min-width: 640px){.footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width: 1024px){.footer-cols{grid-template-columns:2fr 1fr 1fr 1fr}}.footer h2{margin:0;font-size:15px;line-height:var(--cell);font-weight:700}.footer p{color:var(--ink-soft);max-width:30em}.footer li a{display:inline-block;line-height:var(--cell)}.footer-note{margin-top:var(--cell);color:var(--ink-soft);font-size:14px}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation:none!important;transition:none!important}}.gm-ld{margin-top:var(--cell);max-width:100%;overflow:auto hidden}.gm-ld-grid{display:grid;grid-template-columns:repeat(var(--cols, 1),var(--cell));grid-auto-rows:var(--cell);width:-moz-max-content;width:max-content;position:relative}.gm-ld-rule{align-self:end;height:2px;margin-bottom:-1px;background:currentColor}.prop-grid{display:grid;grid-template-columns:minmax(0,1fr) calc(2 * var(--cell)) minmax(0,1fr);grid-template-rows:repeat(3,calc(2 * var(--cell)));max-width:calc(16 * var(--cell))}.prop-grid .expr{text-align:center;padding:0 6px}.prop-grid .expr::-moz-placeholder{color:var(--ink-soft);opacity:.6;font-style:italic}.prop-grid .expr::placeholder{color:var(--ink-soft);opacity:.6;font-style:italic}.prop-a{grid-area:1 / 1}.prop-b{grid-area:3 / 1}.prop-c{grid-area:1 / 3}.prop-d{grid-area:3 / 3}.prop-bar{align-self:center;height:2px;background:var(--pen)}.prop-bar-1{grid-area:2 / 1}.prop-bar-2{grid-area:2 / 3}.prop-eq{grid-area:2 / 2;display:grid;place-items:center;font:600 19px/1 var(--mono);color:var(--pen)}.prop .keys{margin-top:var(--cell)}.calc.is-error .prop-grid .expr[aria-invalid=true]{box-shadow:inset 0 0 0 2px var(--teacher)}.calc.is-error .prop-grid .expr:not([aria-invalid=true]){box-shadow:inset 0 0 0 2px var(--pen)}.prop .cmp-verdict{min-height:var(--cell)}.answer .gm+.gm{margin-top:var(--cell)}.example .ex-text{display:flex;flex-direction:column;font:600 17px/calc(2 * var(--cell)) var(--mono);color:var(--pen);min-width:0}.example .ex-text span{white-space:nowrap}.bars{display:flex;flex-wrap:wrap;align-items:center;gap:var(--cell);margin-top:var(--cell)}.bars .bars-label{margin-top:0}.bar{display:grid;grid-template-columns:repeat(var(--parts),calc(var(--w) * var(--cell)));height:calc(2 * var(--cell));outline:2px solid var(--pen);outline-offset:-2px}.bar-part+.bar-part{box-shadow:inset 1px 0 0 0 var(--pen)}.bar-part.is-on{background:var(--marker-soft)}.gen,.gen-group{margin-top:var(--cell)}.gen-group:first-child{margin-top:0}.gen-note{font-weight:400;color:var(--ink-soft)}.gen-chips{display:flex;flex-wrap:wrap;gap:calc(var(--cell) / 2) var(--cell);margin-top:calc(var(--cell) / 2)}.gen-check{display:flex;align-items:center;gap:calc(var(--cell) / 2);min-height:calc(2 * var(--cell));margin-top:var(--cell)}.gen-check input{width:20px;height:20px;accent-color:var(--pen)}.gen-actions{display:flex;flex-wrap:wrap;gap:var(--cell);margin-top:var(--cell)}.gen-sheet{margin-top:calc(2 * var(--cell))}.gen-meta{color:var(--ink-soft);font-size:15px}.gen-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(calc(12 * var(--cell)),1fr));gap:var(--cell) calc(2 * var(--cell));margin-top:var(--cell);counter-reset:gen}.gen-list li{display:flex;align-items:center;gap:calc(var(--cell) / 2);counter-increment:gen;min-width:0}.gen-list li:before{content:counter(gen) ".";flex:none;width:calc(1.5 * var(--cell));font:600 15px/1 var(--mono);color:var(--teacher)}.gen-list .gm{margin-top:0}.gen-key{margin-top:calc(2 * var(--cell))}.gen-key[hidden]{display:none}.gen-level-hint{min-height:calc(2 * var(--cell))}.gen-chips .chip{min-width:calc(2 * var(--cell))}.chip[aria-disabled=true]{cursor:not-allowed}.gen-instr{margin-top:calc(var(--cell) / 2)}.gen-label{flex:none;font-size:15px;color:var(--ink-soft)}.gen-print-head{display:none}@media print{@page{margin:14mm}html,body,.sheet,main{background:none!important;min-height:0!important;height:auto!important}.sheet{width:100%!important;padding:0!important}.sheet:before,.sheet:after{display:none!important}.skip,.sheet>:not(main),main>:not(.calc-section),.calc-section>:not(.print-sheet){display:none!important}.print-sheet{margin:0}.print-sheet>:last-child,.gen-key>:last-child{margin-bottom:0}.gen-print-head{display:block;margin:0 0 var(--cell);font-size:14px}.gen-blank{display:inline-block;width:22mm;border-bottom:1px solid #555;margin-right:6mm}.gen-blank-long{width:70mm}.gen-meta{display:none}.print-sheet h2{margin:0;font-size:18px;line-height:1.4}.gen-instr{margin:1mm 0 3mm;font-size:14px}.gen-problems{margin-top:0}.gen-problems{grid-template-columns:1fr 1fr;gap:4mm}.gen-problems li{display:block;min-height:38mm;padding:2mm 3mm;border:1px solid #9aa7c7;background-image:linear-gradient(to bottom,#dde5f5 1px,transparent 1px),linear-gradient(to right,#dde5f5 1px,transparent 1px);background-size:5mm 5mm;-webkit-print-color-adjust:exact;print-color-adjust:exact;-moz-column-break-inside:avoid;break-inside:avoid}.gen-problems li:before{display:inline-block;margin-bottom:1mm}.gen-problems .gen-label{display:inline-block;margin-right:2mm}.gen-key{-moz-column-break-before:page;break-before:page;margin-top:0}.gen-answers li{-moz-column-break-inside:avoid;break-inside:avoid}}.quiz{margin-top:var(--cell)}.quiz-head{display:flex;justify-content:space-between;gap:var(--cell);flex-wrap:wrap}.quiz-score{font:600 15px/var(--cell) var(--mono);color:var(--ink-soft)}.quiz-progress{display:flex;flex-wrap:wrap;gap:0;margin-top:calc(var(--cell) / 2)}.quiz-progress li{width:var(--cell);height:var(--cell);box-shadow:inset 0 0 0 1px var(--pen)}.quiz-progress li.is-ok{background:var(--marker-soft)}.quiz-progress li.is-bad{box-shadow:inset 0 0 0 2px var(--teacher)}.quiz-progress li.is-now{box-shadow:inset 0 0 0 2px var(--pen)}.quiz-question{margin-top:var(--cell);min-height:calc(2 * var(--cell))}.quiz-question .gm,.quiz-labelled .gm{margin-top:0}.quiz-labelled{display:flex;align-items:center;gap:calc(var(--cell) / 2)}.quiz-ask{margin-top:var(--cell);color:var(--ink-soft)}.quiz-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:calc(var(--cell) / 2);margin-top:calc(var(--cell) / 2)}@media (min-width: 640px){.quiz-options{grid-template-columns:repeat(4,minmax(0,1fr));gap:var(--cell)}}.quiz-option{display:flex;align-items:center;gap:var(--cell);width:100%;min-height:calc(3 * var(--cell));padding:calc(var(--cell) / 2) calc(var(--cell) / 2);box-shadow:inset 0 0 0 2px var(--pen);color:var(--ink);text-align:left}.quiz-option .gm{margin-top:0}.quiz-option:hover:not(:disabled){background:var(--pen-wash)}.quiz-option:focus-visible{outline:3px solid var(--ink);outline-offset:2px}.quiz-question:focus,.quiz-final:focus{outline:none}.quiz-option:disabled{cursor:default}.quiz-option.is-correct{background:var(--marker-soft)}.quiz-option.is-wrong{box-shadow:inset 0 0 0 3px var(--teacher)}.quiz-key{flex:none;font:600 15px/1 var(--mono);color:var(--pen)}.quiz-feedback{min-height:calc(6 * var(--cell));margin-top:var(--cell)}@media (max-width: 479px){.quiz-feedback{min-height:calc(9 * var(--cell))}}.quiz-ok{font-weight:700}.quiz-bad{font-weight:700;color:var(--teacher)}.quiz-quit{color:var(--pen);text-decoration:underline;min-height:calc(2 * var(--cell));padding:0 calc(var(--cell) / 2)}.btn:disabled{opacity:.4;cursor:default}.quiz-final{font:800 28px/calc(2 * var(--cell)) var(--sans);margin-top:calc(var(--cell) / 2)}.quiz-message{margin-top:calc(var(--cell) / 2)}.quiz-summary-h{margin-top:calc(2 * var(--cell))}.quiz-summary{margin-top:var(--cell);counter-reset:qs}.quiz-summary li{counter-increment:qs;display:flex;gap:calc(var(--cell) / 2)}.quiz-summary li:before{content:counter(qs) ".";flex:none;width:calc(1.5 * var(--cell));font:600 15px/var(--cell) var(--mono);color:var(--teacher)}.quiz-summary p{font-family:var(--sans)}.quiz-summary li.is-bad p{color:var(--teacher)}