.pl,.pl-card,.pl-rail{width:min(100%,40rem);max-width:40rem;box-sizing:border-box;margin-left:auto;margin-right:auto}.pl{display:flex;flex-direction:column;gap:var(--space-4)}.pl-enter{animation:pl-enter-fade .46s cubic-bezier(.22,1,.36,1)}@keyframes pl-enter-fade{0%{opacity:0;transform:translateY(14px) scale(.98)}60%{opacity:1}to{opacity:1;transform:translateY(0) scale(1)}}.pl-enter .pl-card{animation:pl-enter-settle .46s cubic-bezier(.22,1,.36,1)}@keyframes pl-enter-settle{0%{box-shadow:var(--shadow-lift)}to{box-shadow:var(--shadow-none)}}.pl-enter .pl-bar-fill{animation:pl-enter-bar-grow .46s cubic-bezier(.22,1,.36,1)}@keyframes pl-enter-bar-grow{0%{width:0}}.pl-progress{display:flex;align-items:center;gap:var(--space-3)}.pl-progress-text{font-size:var(--text-xs);font-weight:700;letter-spacing:.04em;color:var(--muted)}.pl-bar{flex:1;height:10px;background:var(--rail);border:var(--border);border-radius:var(--radius-sm);overflow:hidden}.pl-bar-fill{display:block;height:100%;background:var(--support);transition:width .22s ease-out}.pl-elapsed{flex:none;font-size:var(--text-xs);color:var(--muted);font-variant-numeric:tabular-nums}.pl-card{border:var(--border);border-radius:var(--radius-lg);padding:var(--space-4);background:var(--paper)}.pl-question-card{min-height:clamp(22rem,50dvh,28rem)}.pl-stem{font-family:var(--font-display);font-size:var(--text-lg);font-weight:700;line-height:1.3;color:var(--ink)}.pl-note{font-size:var(--text-sm);color:var(--muted)}.pl-frac{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;vertical-align:-.4em;line-height:1.05;margin:0 .1em}.pl-frac-num,.pl-frac-den{display:block;font-size:.7em;line-height:1.15;padding:0 .15em}.pl-frac-num{border-bottom:1px solid currentColor}.pl-frac-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.pl-options{list-style:none;margin:0;padding:0;display:grid;gap:var(--space-2)}.pl-truefalse .pl-options{grid-template-columns:1fr 1fr}.pl-opt{width:100%;display:flex;align-items:center;gap:var(--space-3);min-height:var(--tap-min);padding:13px 14px;box-sizing:border-box;font-family:var(--font-body);font-size:var(--text-md);text-align:left;color:var(--body);background:var(--paper);border:var(--border);border-radius:var(--radius-md);cursor:pointer;transition:background-color .18s ease-out,border-color .18s ease-out,color .18s ease-out}.pl-opt:hover{background:var(--accent-soft);color:var(--ink)}.pl-opt[data-state=correct]{background:var(--ok);color:var(--ink)}.pl-opt[data-state=wrong]{background:var(--warn);color:var(--ink)}.pl-opt[data-state=locked]{background:var(--rail);color:var(--muted);border-color:var(--muted);cursor:default}.pl-opt[data-state=correct],.pl-opt[data-state=wrong]{animation:pl-verdict-pop .24s ease-out}@keyframes pl-verdict-pop{0%{transform:scale(.97)}55%{transform:scale(1.015)}to{transform:scale(1)}}.pl-glyph{flex:none;width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:var(--border);background:var(--paper);color:var(--body)}.pl-opt[data-state=correct] .pl-glyph{background:var(--ink);color:var(--ok);border-color:var(--ink)}.pl-opt[data-state=wrong] .pl-glyph{background:var(--ink);color:var(--warn);border-color:var(--ink)}.pl-opt[data-state=locked] .pl-glyph{border-color:var(--muted);color:var(--muted)}.pl-opt[data-state=correct] .pl-glyph,.pl-opt[data-state=wrong] .pl-glyph{animation:pl-glyph-pop .24s cubic-bezier(.34,1.56,.64,1)}@keyframes pl-glyph-pop{0%{transform:scale(.4)}to{transform:scale(1)}}.pl-input{display:block;width:100%;box-sizing:border-box;font-family:var(--font-body);font-size:var(--text-md);color:var(--ink);background:var(--paper);border:var(--border);border-radius:var(--radius-md);padding:0 14px;min-height:var(--tap-min)}.pl-input[data-state=correct]{background:var(--ok);border-color:var(--ok-strong)}.pl-fill-actions{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-2);margin-top:var(--space-3)}.pl-fill-feedback{margin-top:var(--space-3)}.pl-check-status{min-height:1.5rem;margin-top:var(--space-2)}.pl-check-pending{display:inline-flex;align-items:center;gap:var(--space-2);color:var(--muted);font-size:var(--text-sm)}.pl-check-spinner{width:.85rem;height:.85rem;flex:none;box-sizing:border-box;border:2px solid var(--rail);border-top-color:var(--support);border-radius:50%;animation:pl-check-spin .7s linear infinite}@keyframes pl-check-spin{to{transform:rotate(360deg)}}.pl-truefalse-stem{margin-bottom:var(--space-3)}.pl-truefalse-assertion{display:block;margin-top:var(--space-2);padding-left:var(--space-3);border-left:3px solid var(--support);color:var(--body)}.pl-flip{border:var(--border);border-radius:var(--radius-lg);padding:var(--space-5);min-height:120px;display:flex;align-items:center;justify-content:center;text-align:center;overflow-wrap:anywhere}.pl-flip[data-face=front]{font-family:var(--font-display);font-weight:700;font-size:1.1875rem;color:var(--ink);background:var(--paper)}.pl-flip[data-face=back]{font-size:1rem;line-height:1.45;color:var(--ink);background:var(--accent)}.pl-explain{margin-top:14px;padding:14px;background:var(--rail);border-radius:var(--radius-md);color:var(--body);line-height:1.5;animation:pl-explain-in .22s ease-out}@keyframes pl-explain-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.pl-rail{padding:var(--space-4);background:var(--rail);border:var(--border);border-radius:var(--radius-lg)}.pl-build{display:flex;flex-direction:column;gap:var(--space-3)}.pl-build-bar{display:block;height:8px;overflow:hidden;background:var(--paper);border:var(--border);border-radius:var(--radius-sm)}.pl-build-fill{display:block;height:100%;width:100%;background:var(--support);animation:pl-build-grow 3s linear}@keyframes pl-build-grow{0%{width:0}}.pl-build-pitch{margin:0;color:var(--body);font-size:var(--text-sm)}.pl-offline{padding:var(--space-3) var(--space-4);background:var(--support);border:var(--border);border-radius:var(--radius-md);color:var(--ink)}.pl-strip{display:flex;flex-wrap:wrap;gap:4px;list-style:none;margin:0 0 var(--space-4);padding:0}.pl-strip li{width:22px;height:22px;border:var(--border);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:var(--text-xs)}.pl-strip li[data-ok=true]{background:var(--ok)}.pl-strip li[data-ok=false]{background:var(--rail)}.pl-strip li{animation:pl-chip-in .26s both cubic-bezier(.34,1.56,.64,1)}.pl-strip li:nth-child(1){animation-delay:60ms}.pl-strip li:nth-child(2){animation-delay:90ms}.pl-strip li:nth-child(3){animation-delay:.12s}.pl-strip li:nth-child(4){animation-delay:.15s}.pl-strip li:nth-child(5){animation-delay:.18s}.pl-strip li:nth-child(6){animation-delay:.21s}.pl-strip li:nth-child(n+7){animation-delay:.24s}@keyframes pl-chip-in{0%{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}.pl-card:has(#end-h){position:relative;overflow:hidden}.pl-card:has(#end-h):before{content:"";position:absolute;top:-40px;left:-10%;right:-10%;height:140px;background:radial-gradient(ellipse at center,var(--accent-soft),transparent 72%);opacity:.8;pointer-events:none}#end-h:after{content:"";display:block;width:48px;height:4px;margin-top:6px;border-radius:var(--radius-sm);background:var(--support)}.pl-share{border:var(--border);border-radius:var(--radius-lg);background:var(--paper);color:var(--ink);padding:var(--space-4);margin:auto;width:min(92vw,440px);box-sizing:border-box}.pl-share::backdrop{background:color-mix(in srgb,var(--ink) 45%,transparent)}.pl-share-head{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3)}.pl-share-head h2{margin:0;font-size:var(--text-lg)}.pl-share-close{flex:none;width:var(--tap-min);height:var(--tap-min);display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-weight:700;font-size:var(--text-md);color:var(--ink);background:var(--paper);border:var(--border);border-radius:var(--radius-md);cursor:pointer}.pl-share-close:hover{background:var(--accent-soft)}.pl-share-url{margin:var(--space-3) 0;padding:var(--space-3);background:var(--rail);border-radius:var(--radius-md);font-size:var(--text-sm);color:var(--ink);overflow-wrap:anywhere;user-select:all}.pl-share-wait{margin:var(--space-3) 0;color:var(--body)}.pl-share-copy{width:100%}.pl-actions{position:sticky;bottom:0;display:grid;gap:var(--space-2);width:100%;box-sizing:border-box;padding:var(--space-3) 0 calc(var(--space-3) + env(safe-area-inset-bottom));background:var(--paper);border-top:var(--border)}.pl-primary{width:100%;min-height:var(--tap-min);padding:0 18px;font-family:var(--font-body);font-size:var(--text-md);font-weight:700;color:var(--ink);background:var(--accent);border:var(--border);border-radius:var(--radius-md);cursor:pointer}.pl-primary:hover{background:var(--accent-hover)}a.pl-primary{display:flex;align-items:center;justify-content:center;text-decoration:none}.pl-primary:active{box-shadow:var(--shadow-lift)}.pl-secondary{background:var(--paper)}.pl-confirm{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-2)}.kt-session{display:grid;grid-template-rows:auto minmax(0,1fr) auto;gap:var(--space-3);min-height:calc(100dvh - 13rem);max-width:48rem;margin:0 auto}.kt-session-head{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3)}.kt-count,.kt-progress{margin:0}.kt-count{font-family:var(--font-display);font-size:var(--text-lg);font-weight:700;color:var(--ink)}.kt-progress{color:var(--muted);font-size:var(--text-sm)}.kt-card{display:grid;grid-template-rows:minmax(18rem,1fr) auto;gap:var(--space-3);min-height:0}.kt-flip-scene{min-height:18rem;perspective:80rem}.kt-flipper{position:relative;width:100%;height:100%;min-height:18rem;transform-style:preserve-3d;transition:transform .42s ease}.kt-flipper.is-flipped{transform:rotateY(180deg)}.kt-face{position:absolute;inset:0;display:grid;place-content:center;overflow:auto;padding:clamp(var(--space-4),5vw,var(--space-6));border:var(--border);border-radius:var(--radius-lg);background:var(--paper);color:var(--ink);box-shadow:var(--shadow-lift);backface-visibility:hidden;text-align:center;font-family:var(--font-display);font-size:clamp(var(--text-lg),3vw,var(--text-2xl))}.kt-back{align-content:center;gap:var(--space-4);transform:rotateY(180deg)}.kt-answer{font-size:clamp(var(--text-xl),4vw,var(--text-2xl))}.kt-back .pl-explain{margin:0;font-family:var(--font-body);font-size:var(--text-md);color:var(--body)}.kt-actions{display:grid;place-items:center;min-height:5.5rem}.kt-turn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-width:10rem}.kt-turn svg{width:var(--text-lg);height:var(--text-lg);fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}.kt-result-actions{width:min(100%,34rem);display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3)}.kt-result-actions button{min-height:var(--tap-min);padding:var(--space-2) var(--space-4);border:var(--border);border-radius:var(--radius-md);color:var(--ink);font-family:var(--font-body);font-size:var(--text-md);font-weight:700;cursor:pointer}.kt-knew{background:var(--ok)}.kt-did-not-know{background:var(--warn)}.kt-result-actions button:disabled,.kt-turn:disabled{cursor:progress;opacity:.7}.kt-chooser{display:grid;gap:var(--space-4);max-width:36rem}.kt-chooser h2{margin:0}.kt-chooser fieldset{display:grid;margin:0;padding:0;border:0}.kt-grade{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:var(--space-3);min-height:var(--tap-min);padding:var(--space-2) var(--space-3);border-bottom:1px solid color-mix(in srgb,var(--ink) 22%,transparent);cursor:pointer}.kt-grade:has(input:checked){background:var(--accent-soft)}.kt-grade input{width:1.25rem;height:1.25rem;accent-color:var(--accent-strong)}.kt-grade span:last-child{color:var(--muted);font-size:var(--text-sm)}.kt-empty{display:grid;gap:var(--space-2);max-width:34rem}.kt-empty-fact{margin:0;font-family:var(--font-display);font-size:var(--text-lg);color:var(--ink)}.kt-empty-why{margin:0;color:var(--body)}.kt-signedout{max-width:34rem;margin:0}.kt-wait{color:var(--body)}.kt-said{min-height:1.5rem;margin:0;color:var(--body);text-align:center}.kt-done{display:grid;gap:var(--space-3);max-width:34rem;margin:var(--flow-section) auto 0;text-align:center}.kt-done h2,.kt-done p{margin:0}.kt-done .pl-primary{justify-self:center}@media(max-width:639px){.kt-session{min-height:calc(100dvh - 11rem)}.kt-card{grid-template-rows:minmax(16rem,1fr) auto}.kt-flip-scene,.kt-flipper{min-height:16rem}.kt-result-actions{gap:var(--space-2)}.kt-result-actions button{padding-inline:var(--space-2);font-size:var(--text-sm)}.kt-grade{grid-template-columns:auto 1fr}.kt-grade span:last-child{grid-column:2}}@media(prefers-reduced-motion:reduce){.kt-flipper{transition:none}}.kt-lede[data-astro-cid-wjj6afaw]{margin:0 0 var(--flow-section);color:var(--body)}.kt-back[data-astro-cid-wjj6afaw]{display:inline-flex;align-items:center;gap:var(--space-2);min-height:var(--tap-min-adult);margin-bottom:var(--space-2)}.kt-back-icon[data-astro-cid-wjj6afaw]{display:inline-block;direction:ltr;unicode-bidi:isolate}