:root{--bg-abyss: #070a0f;--bg-deep: #0c1119;--bg-raised: #131b26;--bg-overlay: #1a2432;--line: #24303f;--line-strong: #35455a;--text: #e8eef6;--text-muted: #9aa9bd;--text-faint: #a0aec0;--action-primary: #67d4f5;--action-text: #07121b;--selection: #233e50;--focus: #a6e7fb;--control-border: #768aa2;--progress: #38bdf8;--progress-dim: #0e7490;--progress-glow: rgba(56, 189, 248, .22);--challenge: #f5a524;--challenge-dim: #7c4a06;--challenge-glow: rgba(245, 165, 36, .2);--correct: #4ade80;--incorrect: #94a3b8;--font-ui: "Segoe UI", system-ui, -apple-system, sans-serif;--font-mono: "Cascadia Mono", "Consolas", monospace;--t-hero: clamp(1.75rem, 3vw, 2.25rem);--t-title: clamp(1.375rem, 2vw, 1.625rem);--t-body: 1.0625rem;--t-small: .875rem;--t-micro: .875rem;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-6: 1.5rem;--space-8: 2rem;--space-12: 3rem;--radius: 10px;--radius-lg: 16px;--dur-fast: .12s;--dur: .18s;--dur-slow: .2s;--ease: cubic-bezier(.2, .7, .3, 1)}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}:root[data-motion=off] *,:root[data-motion=off] *:before,:root[data-motion=off] *:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg-abyss);color:var(--text);font-family:var(--font-ui);font-size:var(--t-body);line-height:1.55;-webkit-font-smoothing:antialiased}:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:4px}button{font:inherit;color:inherit;cursor:pointer}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.boot{display:grid;place-items:center;height:100%;margin:0;color:var(--text-muted)}kbd{font-family:var(--font-mono);font-size:var(--t-micro);padding:2px 6px;border:1px solid var(--line-strong);border-radius:4px;color:var(--text-faint);background:var(--bg-abyss)}.dzis{max-width:34rem;margin:0 auto;padding:var(--space-6) var(--space-4) var(--space-12);display:flex;flex-direction:column;gap:var(--space-4)}.dzis__data{margin:0;color:var(--text-muted);font-size:var(--t-small)}.dzis__data:first-letter{text-transform:uppercase}.dzis__tytul{margin:0 0 var(--space-2);font-size:var(--t-title)}.dzis__kontynuuj{display:flex;flex-direction:column;align-items:flex-start;gap:var(--space-1);width:100%;min-height:6.5rem;padding:var(--space-6);border:1px solid var(--progress-dim);border-radius:var(--radius-lg);background:linear-gradient(160deg,var(--progress-glow),var(--bg-raised) 70%);color:var(--text);text-align:left;cursor:pointer;font:inherit}.dzis__kontynuuj:hover{border-color:var(--progress)}.dzis__kontynuuj:focus-visible{outline:3px solid var(--progress);outline-offset:3px}.dzis__kontynuuj-napis{font-size:var(--t-title);font-weight:700}.dzis__kontynuuj-opis{color:var(--text-muted)}.dzis__gotowe{padding:var(--space-4);border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--bg-raised)}.dzis__powtorka{margin:0;color:var(--text-muted)}.dzis__lekcje{list-style:none;margin:var(--space-2) 0 0;padding:0;display:grid;gap:var(--space-2)}.dzis__lekcje button{width:100%;min-height:3.25rem;display:flex;justify-content:space-between;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font:inherit;text-align:left;cursor:pointer}.dzis__status{color:var(--text-faint);font-size:var(--t-small);text-align:right}.dzis__dol{display:flex;flex-direction:column;gap:var(--space-2);margin-top:var(--space-4)}.dzis__link{align-self:flex-start;min-height:2.75rem;padding:0;border:0;background:none;color:var(--progress);font:inherit;cursor:pointer}.feed{position:fixed;inset:0;display:flex;flex-direction:column;background:var(--bg-abyss);color:var(--text);font-family:var(--font-ui)}.feed__gora{display:flex;align-items:center;gap:var(--space-3);padding:max(var(--space-2),env(safe-area-inset-top)) var(--space-4) var(--space-2);border-bottom:1px solid var(--line)}.feed__wyjdz{min-width:2.75rem;min-height:2.75rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font:inherit;cursor:pointer}.feed__wyjdz span{margin-left:var(--space-1)}.feed__tytul{flex:1;min-width:0}.feed__tytul p{margin:0 0 var(--space-1);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.feed__pasek{height:4px;border-radius:2px;background:var(--line);overflow:hidden}.feed__pasek span{display:block;height:100%;background:var(--progress);transition:width var(--dur) var(--ease)}.feed__progress-line{display:flex;align-items:center;gap:10px}.feed__progress-line .feed__pasek{flex:1}.feed__percent{font-size:.75rem;color:var(--text-muted);min-width:3ch;text-align:right}.feed__phase{display:block;margin-top:3px;font-size:.75rem;color:var(--progress)}.feed__uklad{flex:1;min-height:0;display:flex}.feed__scena{position:relative;flex:1;min-width:0;overflow-y:auto;overscroll-behavior:contain;touch-action:pan-y;padding:var(--space-4)}.feed__karta{max-width:40rem;margin:0 auto;display:flex;flex-direction:column;gap:var(--space-4);animation:karta-gora .18s var(--ease)}.feed__karta--dol{animation-name:karta-dol}@keyframes karta-gora{0%{opacity:0;transform:translateY(24px)}}@keyframes karta-dol{0%{opacity:0;transform:translateY(-24px)}}@media (prefers-reduced-motion: reduce){.feed__karta,.feed__karta--dol{animation:none}}.feed__relacja{margin:0;padding:var(--space-1) var(--space-3);align-self:flex-start;border:1px solid var(--line);border-radius:999px;color:var(--text-muted);font-size:var(--t-small)}.feed__relacja--pomoc{border-color:var(--challenge-dim);color:var(--challenge)}.feed__podglad{margin:0;color:var(--challenge);font-size:var(--t-small)}.feed__komunikat{position:sticky;top:0;z-index:2;max-width:40rem;margin:0 auto var(--space-3);padding:var(--space-2) var(--space-4);border-radius:var(--radius);background:var(--bg-overlay);color:var(--text);font-size:var(--t-small)}.feed__dol{display:grid;grid-template-columns:auto 1fr auto;gap:var(--space-2);padding:var(--space-2) var(--space-4) 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var(--progress-dim);background:var(--bg-deep);color:var(--text-muted)}.karta__pytanie{margin:0;font-size:clamp(1.2rem,4.2vw,1.5rem);line-height:1.4;font-weight:600}.karta__uwaga{margin:0;color:var(--text-faint);font-size:var(--t-small)}.karta__zadanie{padding:var(--space-4);border:1px solid var(--line-strong);border-radius:var(--radius-lg);background:var(--bg-raised)}.karta__tresc{margin:0 0 var(--space-2);line-height:1.6;white-space:pre-line}.karta__sprawdz{align-self:flex-start;min-height:3rem}.opcje{display:flex;flex-direction:column;gap:var(--space-2)}.opcja{min-height:3.25rem;padding:var(--space-3) var(--space-4);border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font:inherit;text-align:left;cursor:pointer}.opcja:hover:not(:disabled){border-color:var(--progress)}.opcja--wybrana{border-color:var(--progress);background:var(--progress-glow)}.opcje--decyzja .opcja{border-style:dashed}.opcja__litera{font-weight:700;margin-right:var(--space-1)}.opcja:disabled,.linie__linia:disabled{cursor:default;opacity:.85}.linie{display:flex;flex-direction:column;gap:var(--space-2)}.linie--zapis{list-style:none;margin:0;padding:0}.linie--zapis .linie__linia{min-height:40px;padding:var(--space-2) var(--space-3);border:none;border-radius:0;border-left:2px solid var(--line-strong)}.opcje--wiersze{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.opcje--wiersze .opcja{padding:var(--space-2)}.karta__pomoc{padding:var(--space-3);border:1px solid var(--line-strong);border-radius:var(--radius);overflow-wrap:anywhere}.karta__pomoc summary{cursor:pointer;min-height:44px;align-content:center}.karta__pomoc li+li{margin-top:var(--space-3)}.linie__linia{display:flex;align-items:center;gap:var(--space-3);min-height:3.25rem;padding:var(--space-3) var(--space-4);border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font:inherit;font-family:var(--font-mono);text-align:left;cursor:pointer}.linie__nr{flex:none;width:1.6rem;height:1.6rem;display:inline-grid;place-items:center;border-radius:50%;background:var(--bg-overlay);color:var(--text-muted);font-size:var(--t-micro);font-family:var(--font-ui)}.kolejnosc__ulozone{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:var(--space-2)}.kolejnosc__ulozone button{width:100%;display:flex;align-items:center;gap:var(--space-3);min-height:3rem;padding:var(--space-2) var(--space-4);border:1px solid var(--progress-dim);border-radius:var(--radius);background:var(--progress-glow);color:var(--text);font:inherit;text-align:left}.kolejnosc__pula{display:flex;flex-direction:column;gap:var(--space-2)}.kod{margin:0;padding:var(--space-4);border-radius:var(--radius);background:var(--bg-deep);border:1px solid var(--line);font-family:var(--font-mono);font-size:.95rem;line-height:1.5;overflow-x:auto}.wpis{display:flex;flex-direction:column;gap:var(--space-2)}.wpis__pole{width:100%;min-height:3.25rem;padding:var(--space-3) var(--space-4);border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font:inherit;font-size:1.15rem;box-sizing:border-box}.wpis__pole:focus{outline:2px solid var(--progress);outline-offset:1px}.wpis__pole--kod{font-family:var(--font-mono);font-size:1rem;resize:vertical}.wpis__pole--dlugie{font-size:1rem;resize:vertical}.wpis__znaki{display:flex;gap:var(--space-2)}.wpis__znak{flex:1;min-height:3rem;border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--bg-raised);color:var(--text);font-size:1.25rem;font-family:var(--font-mono);cursor:pointer}.wpis__akcje{display:flex;gap:var(--space-2);flex-wrap:wrap}.wpis__akcje .btn{min-height:3rem}.wpis__etykieta{display:flex;flex-direction:column;gap:var(--space-1);color:var(--text-muted);font-size:var(--t-small)}.wpis__podpowiedz{margin:0;padding:var(--space-2) var(--space-3);border-radius:var(--radius);background:var(--bg-overlay);color:var(--text-muted)}.pf{display:flex;flex-direction:column;gap:var(--space-3)}.pf__wiersz{display:flex;gap:var(--space-3);align-items:center;justify-content:space-between}.pf__wiersz p{margin:0}.pf__przyciski{display:flex;gap:var(--space-2)}.pf__btn{width:3rem;height:3rem;border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font:inherit;font-weight:700;cursor:pointer}.pf__btn--on{border-color:var(--progress);background:var(--progress-glow)}.otwarta{display:flex;flex-direction:column;gap:var(--space-2)}.otwarta__tytul{margin:var(--space-2) 0 0;color:var(--text-muted);font-size:var(--t-small);font-weight:600}.otwarta__kryteria,.otwarta__wzorcowe{margin:0;padding-left:1.2rem;display:grid;gap:var(--space-1)}.otwarta__kryteria li.ok{color:var(--correct)}.otwarta__auto{color:var(--text-faint);font-size:var(--t-small)}.brudnopis{display:flex;flex-direction:column;gap:var(--space-1);color:var(--text-muted);font-size:var(--t-small)}.brudnopis textarea{padding:var(--space-3);border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font-family:var(--font-mono);font-size:1rem;resize:vertical}.info{padding:var(--space-3) var(--space-4);border-radius:var(--radius);border:1px solid var(--line-strong);background:var(--bg-raised);animation:info .2s var(--ease)}.info--ok{border-color:var(--correct)}.info__werdykt{margin:0 0 var(--space-1);font-weight:700}.info--ok .info__werdykt{color:var(--correct)}.info__przyczyna{margin:0 0 var(--space-2)}.info__wyjasnienie{margin:0;color:var(--text-muted);line-height:1.5}@keyframes info{0%{opacity:0;transform:scale(.98)}}@media (prefers-reduced-motion: reduce){.info{animation:none}}.zrodlo{padding:var(--space-2) var(--space-3);border:1px solid var(--line);border-radius:var(--radius);color:var(--text-muted);font-size:var(--t-small)}.zrodlo summary{min-height:2.5rem;display:flex;align-items:center;cursor:pointer;color:var(--text)}.zrodlo a{color:var(--progress)}.zrodlo ol{padding-left:1.2rem}.python{display:flex;flex-direction:column;gap:var(--space-2)}.python__etykieta{color:var(--text-muted);font-size:var(--t-small)}.python__kod{width:100%;box-sizing:border-box;padding:var(--space-3);border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font-family:var(--font-mono);font-size:.95rem;line-height:1.5;tab-size:4;resize:vertical}.python .btn{align-self:flex-start;min-height:2.75rem}.python__wynik{padding:var(--space-2) var(--space-3);border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-deep)}.python__wynik.ok{border-color:var(--correct)}.python__wynik pre{margin:0;font-family:var(--font-mono);white-space:pre-wrap}.python__wynik p{margin:var(--space-1) 0 0;font-size:var(--t-small);color:var(--text-muted)}.karta__python-otworz{align-self:flex-start;min-height:2.75rem}.nauczyciel{position:fixed;inset:auto 0 0;z-index:20;max-height:85dvh;display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-4) var(--space-4) max(var(--space-4),env(safe-area-inset-bottom));border-top:1px solid var(--line-strong);border-radius:var(--radius-lg) var(--radius-lg) 0 0;background:var(--bg-raised);box-shadow:0 -12px 40px #00000080}.feed--komputer .nauczyciel{inset:0 0 0 auto;width:min(28rem,40vw);max-height:none;border-radius:0;border-top:0;border-left:1px solid var(--line-strong)}.nauczyciel__glowa{display:flex;justify-content:space-between;align-items:flex-start;gap:var(--space-2)}.nauczyciel__tytul{margin:0;font-weight:700}.nauczyciel__tryb{margin:0;color:var(--progress);font-size:var(--t-small)}.nauczyciel__tryb--demo{color:var(--challenge)}.nauczyciel__demo{margin:0;padding:var(--space-2) var(--space-3);border:1px dashed var(--challenge-dim);border-radius:var(--radius);color:var(--text-muted);font-size:var(--t-small)}.nauczyciel__czat{flex:1;min-height:6rem;overflow-y:auto;display:flex;flex-direction:column;gap:var(--space-2)}.dymek{position:relative;max-width:90%;padding:var(--space-2) var(--space-3);border-radius:var(--radius);line-height:1.5}.dymek p{margin:0 0 var(--space-1)}.dymek--uczen{align-self:flex-end;background:var(--progress-glow)}.dymek--nauczyciel{align-self:flex-start;background:var(--bg-overlay)}.dymek__demo{display:inline-block;margin-bottom:var(--space-1);padding:0 var(--space-2);border-radius:999px;background:var(--challenge-glow);color:var(--challenge);font-size:var(--t-micro)}.nauczyciel__szybkie{display:flex;flex-wrap:wrap;gap:var(--space-2)}.nauczyciel__szybkie .btn{min-height:2.5rem}.nauczyciel__pelne{border-style:dashed}.nauczyciel__pytanie{display:flex;gap:var(--space-2)}.nauczyciel__pytanie input{flex:1;min-height:2.75rem;padding:0 var(--space-3);border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font:inherit}.panel-zadania{width:22rem;flex:none;overflow-y:auto;padding:var(--space-4);border-left:1px solid var(--line);background:var(--bg-deep);display:flex;flex-direction:column;gap:var(--space-3)}.panel-zadania__etykieta{margin:0;color:var(--progress);font-size:var(--t-small);font-weight:600}.panel-zadania__tresc{margin:0;line-height:1.6;white-space:pre-line}.panel-zadania__abcd{display:flex;flex-wrap:wrap;gap:var(--space-3);margin:0}.panel-zadania__kroki{margin:0;padding-left:1.4rem;display:grid;gap:var(--space-1);color:var(--text-muted)}.panel-zadania__kroki li.on{color:var(--text);font-weight:600}.panel-zadania__znak{display:inline-block;width:1rem;color:var(--progress)}.feed--komputer .feed__scena{padding:var(--space-8)}.feed__desk-tools{flex:0 0 clamp(20rem,37%,29rem);min-width:0;overflow-y:auto;overscroll-behavior:contain;border-left:1px solid var(--line);padding:1rem;background:var(--bg-deep)}.feed__desk-tools .workspace{padding:12px;gap:10px}.feed__desk-tools .workspace__header{display:block}.feed__desk-tools .workspace__header>button{margin-top:8px}.feed__desk-tools .workspace__history ol{max-height:none}.feed--komputer .feed__dol{grid-template-columns:auto auto auto;justify-content:center}@media (max-width: 420px){.feed__wyjdz span{display:none}}.feed__ikona{min-width:2.75rem;min-height:2.75rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-deep);font-size:1.15rem;cursor:pointer}.feed__krok{margin:0;color:var(--text-muted);font-size:var(--t-small);letter-spacing:.02em}.feed__krok--pomoc{color:var(--challenge)}.opcja__kod{margin:0;font-family:var(--font-mono, ui-monospace, monospace);font-size:.95rem;white-space:pre-wrap}.karta__pomoc--mala{padding:0 var(--space-3);border-style:dashed;color:var(--text-muted)}.info__wiecej summary{min-height:44px;align-content:center;cursor:pointer;color:var(--progress)}.arkusz{display:flex;flex-direction:column;gap:var(--space-3);padding:var(--space-4)}.arkusz__glowa{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3)}.arkusz__tytul{margin:0;font-weight:700}.arkusz__tresc{margin:0;line-height:1.55}.arkusz__abcd{display:grid;gap:var(--space-1);margin:0}.nauczyciel__start{display:flex;flex-direction:column;align-items:flex-start;gap:var(--space-2)}.sformatowane{display:flex;flex-direction:column;gap:var(--space-2);line-height:1.55}.sformatowane p,.sformatowane ul,.sformatowane ol{margin:0}.sformatowane ul,.sformatowane ol{padding-left:1.25rem;display:flex;flex-direction:column;gap:var(--space-1)}.sformatowane strong{color:var(--text);font-weight:700}.sformatowane__naglowek{font-weight:700}.sformatowane__wzor{padding:var(--space-2) 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var(--dur-slow) var(--ease)}.gap__meta{display:block;margin-top:var(--space-2);font-size:var(--t-micro);color:var(--text-faint)}.variants{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:var(--space-4)}.variant{text-align:left;display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-4);background:var(--bg-deep);border:1px solid var(--line);border-radius:var(--radius);transition:border-color var(--dur) var(--ease)}.variant--on{border-color:var(--progress);box-shadow:0 0 0 1px var(--progress-glow)}.variant__name{font-weight:650;font-size:var(--t-body)}.variant__targets,.variant__load{font-size:var(--t-small);color:var(--text-muted)}.variant__load{color:var(--progress)}.variant__tradeoff{font-size:var(--t-micro);color:var(--text-faint);border-top:1px solid var(--line);padding-top:var(--space-2)}.diag__field{display:flex;flex-direction:column;gap:var(--space-2);max-width:16rem;font-size:var(--t-small);color:var(--text-muted)}.diag__field input{padding:var(--space-3);font:inherit;color:var(--text);background:var(--bg-deep);border:1px solid var(--line-strong);border-radius:var(--radius);color-scheme:dark}.verdict{margin:var(--space-4) 0 0;padding:var(--space-4);border-radius:var(--radius);background:var(--bg-deep);border:1px solid var(--line);color:var(--text-muted)}.verdict--tight{border-color:var(--challenge);color:var(--text)}.steps{margin:0;padding-left:var(--space-6);display:flex;flex-direction:column;gap:var(--space-4)}.step__head{display:flex;justify-content:space-between;gap:var(--space-4)}.step__name{font-weight:600}.step__levels{font-family:var(--font-mono);font-size:var(--t-small);color:var(--progress)}.step__topic{display:block;font-size:var(--t-micro);text-transform:uppercase;letter-spacing:.1em;color:var(--text-faint)}.step__reason{display:block;font-size:var(--t-small);color:var(--text-muted)}.diag__actions{display:flex;flex-wrap:wrap;gap:var(--space-4)}.diag__primary{padding:var(--space-4) var(--space-8);font-weight:650;color:var(--bg-abyss);background:var(--progress);border:none;border-radius:var(--radius)}.diag__secondary{padding:var(--space-4) var(--space-8);background:none;color:var(--text);border:1px solid var(--line-strong);border-radius:var(--radius)}.week{max-width:52rem;margin:0 auto;padding:var(--space-8) var(--space-6) var(--space-12);display:flex;flex-direction:column;gap:var(--space-8)}.week__back{background:none;border:none;padding:0;font-size:var(--t-small);color:var(--text-muted)}.week__back:hover{color:var(--progress)}.week__eyebrow{margin:var(--space-6) 0 var(--space-2);font-size:var(--t-micro);text-transform:uppercase;letter-spacing:.16em;color:var(--progress)}.week__title{margin:0;font-size:var(--t-hero);font-weight:700}.week__sub{margin:var(--space-3) 0 0;color:var(--text-muted)}.week__section{border-left:3px solid 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p{margin:0;font-size:var(--t-body);line-height:1.6}.data{max-width:48rem;margin:0 auto;padding:var(--space-8) var(--space-6) var(--space-12);display:flex;flex-direction:column;gap:var(--space-6)}.data__back{background:none;border:none;padding:0;font-size:var(--t-small);color:var(--text-muted)}.data__eyebrow{margin:var(--space-6) 0 var(--space-2);font-size:var(--t-micro);text-transform:uppercase;letter-spacing:.16em;color:var(--text-faint)}.data__title{margin:0;font-size:var(--t-hero)}.data__lead{margin:var(--space-3) 0 0;color:var(--text-muted);max-width:56ch}.data__counts{margin:var(--space-3) 0 0;font-size:var(--t-small);color:var(--text)}.data__box{margin:0;background:var(--bg-deep);border:1px solid var(--line);border-radius:var(--radius);padding:var(--space-6);color:var(--text-muted);display:flex;flex-direction:column;gap:var(--space-3)}.data__box h2{margin:0;font-size:var(--t-body);color:var(--text)}.data__box h3{margin:var(--space-3) 0 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2}.data__status-label{color:var(--text)}.link{padding:0;border:none;background:none;color:var(--progress);font-size:var(--t-small);cursor:pointer}.link:hover{text-decoration:underline}.today__head{display:flex;justify-content:space-between;align-items:flex-end;gap:var(--space-4);flex-wrap:wrap}.today__counters{display:flex;gap:var(--space-2);flex-wrap:wrap}.today__hero{position:relative;overflow:hidden;display:flex;flex-direction:column;gap:var(--space-3);padding:var(--space-8)}.today__hero:after{content:"";position:absolute;top:-40%;right:-10%;width:22rem;height:22rem;border-radius:50%;background:radial-gradient(circle,var(--progress-glow),transparent 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.link{text-align:center}.plan{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:var(--space-2)}.plan__row{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3);border:1px solid var(--line);border-radius:var(--radius)}.plan__check{flex:none;display:grid;place-items:center;width:1.6rem;height:1.6rem;border:2px solid var(--line-strong);border-radius:50%;color:var(--bg-abyss)}.plan__check--on{border-color:var(--correct);background:var(--correct)}.plan__check--rest{border-color:var(--line);color:var(--text-faint)}.plan__text{flex:1;min-width:0;display:flex;flex-direction:column}.plan__text span{font-size:var(--t-small);color:var(--text-muted)}.today__pace{margin:var(--space-4) 0 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var(--line-strong);border-radius:var(--radius);background:var(--bg-deep);color:var(--text);font:inherit}.lesson-player__transcript{color:var(--text-muted);font-size:var(--t-small)}.lesson-player__transcript summary{cursor:pointer}.lesson-player__transcript p{margin:var(--space-3) 0 0;line-height:1.7;overflow-wrap:anywhere}@media (max-width: 640px){.lesson-player__settings{grid-template-columns:minmax(0,1fr) 5.5rem}.lesson-player__part{grid-column:1 / -1}.lesson-player__play{width:100%;justify-content:center}}.lesson__body{display:flex;flex-direction:column;gap:var(--space-4)}.lesson__p{margin:0;line-height:1.75}.lesson__formula{margin:0;padding:var(--space-6) var(--space-4);text-align:center;font-size:1.25em;background:var(--bg-deep);border:1px solid var(--line);border-radius:var(--radius-lg);overflow-x:auto;scrollbar-width:thin;scrollbar-color:var(--line) transparent}.lesson__formula-parts{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;column-gap:var(--space-8);row-gap:var(--space-2)}.lesson__formula-parts .katex-display{margin:0}@media (max-width: 640px){.lesson__formula{padding:var(--space-4) var(--space-2);font-size:1em}.lesson__formula-parts{column-gap:var(--space-4)}}.lesson__formula figcaption{margin-top:var(--space-3);font-size:var(--t-small);color:var(--text-muted)}.lesson__callout{display:flex;flex-direction:column;gap:var(--space-1);padding:var(--space-4) var(--space-6);border-radius:var(--radius);line-height:1.65}.lesson__callout strong{font-size:var(--t-micro);text-transform:uppercase;letter-spacing:.14em}.lesson__callout--tip{background:color-mix(in srgb,var(--progress) 8%,var(--bg-deep));border-left:3px solid var(--progress)}.lesson__callout--tip strong{color:var(--progress)}.lesson__callout--warn{background:color-mix(in srgb,var(--challenge) 8%,var(--bg-deep));border-left:3px solid var(--challenge)}.lesson__callout--warn strong{color:var(--challenge)}.lesson__h2{margin:0 0 var(--space-3);font-size:var(--t-title)}.lesson__examples{display:flex;flex-direction:column;gap:var(--space-4)}.example{display:flex;flex-direction:column;gap:var(--space-3)}.example__label{margin:0;font-size:var(--t-micro);text-transform:uppercase;letter-spacing:.14em;color:var(--challenge)}.example__prompt{margin:0;font-size:1.1em;font-weight:600}.example__steps{margin:0;padding-left:var(--space-6);display:flex;flex-direction:column;gap:var(--space-3)}.example__step{line-height:1.7;animation:step-in var(--dur) var(--ease)}@keyframes step-in{0%{opacity:0;transform:translate(-6px)}}.example__why{display:block;margin-top:2px;font-size:var(--t-small);color:var(--text-muted);font-style:italic}.example__controls{display:flex;gap:var(--space-3);align-items:center;flex-wrap:wrap}.example__hint{font-size:var(--t-small);color:var(--text-faint)}.example__answer{margin:0;padding:var(--space-3) 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