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var(--font-ui);color:rgb(var(--c-ink-soft));transform:translateY(18px);white-space:nowrap}@container (max-width: 759px){.rv-fc .rv-fc-d{display:none}.rv-fc{margin-bottom:6px}}.rv-statrow{display:flex;align-items:baseline;justify-content:space-between;gap:12px;min-height:44px;padding:8px 0;border-bottom:2px solid rgb(var(--c-ink) / .2);font:500 1rem/1.3 var(--font-ui)}.rv-select{min-height:44px}@media(prefers-reduced-motion:reduce){.rv-grade{transition-duration:0ms}.rv-grade:active:not([aria-disabled=true]){transform:none}.rv-swipe[data-dragging=true]{transform:none}}.rv .rv-wordrow{display:flex;flex-wrap:wrap;gap:8px 12px}.rv .rv-wordrow>:first-child{flex:1 1 14rem}.rv .rv-row-acts{flex-wrap:wrap;justify-content:flex-end;gap:6px;margin-left:auto}.bk-kbd{display:inline-grid;place-items:center;min-width:22px;height:22px;padding:0 5px;border:1.5px solid currentColor;font:600 .74rem/1 var(--font-ui);font-variant-numeric:tabular-nums}.bk-ex{--ok-soft: rgb(var(--c-ok) / .12);--wrong-soft: rgb(var(--c-wrong) / .09);position:relative;display:grid;min-width:0;border:3px solid rgb(var(--c-ink));background:rgb(var(--c-panel));color:rgb(var(--c-ink));font-family:var(--font-ui);container-type:inline-size}.bk-ex-h{display:flex;align-items:center;gap:10px;min-height:44px;padding:2px 4px 2px 14px;border-bottom:2px solid rgb(var(--c-ink))}.bk-ex-n{font:700 1rem/1 var(--font-ui);font-stretch:125%;font-variant-numeric:tabular-nums}.bk-ex-n small{margin-left:1px;font-size:.8em;font-weight:600;color:rgb(var(--c-ink-soft))}.bk-ex-type{font:600 .92rem/1.2 var(--font-ui);color:rgb(var(--c-ink-soft))}.bk-ex-tools{display:flex;gap:2px;margin-left:auto}.bk-ex-tool{display:grid;place-items:center;min-width:44px;min-height:40px;padding:0 6px;border:2px solid transparent;background:none;color:inherit;cursor:pointer;touch-action:manipulation;font:400 .92rem/1 var(--font-hanzi)}.bk-ex-tool svg{width:20px;height:20px}.bk-ex-tool[aria-pressed=true]{background:rgb(var(--c-ink));color:rgb(var(--c-paper))}@media(hover:hover)and (pointer:fine){.bk-ex-tool:hover{border-color:rgb(var(--c-ink))}}.bk-ex-pic{min-width:0;padding:18px 16px 6px}.bk-ex-cap{min-width:0;padding:4px 16px 16px}.bk-ex[data-state=checking] .bk-ex-pic,.bk-ex[data-state=checking] .bk-ex-opts,.bk-ex[data-state=checking] .bk-ex-pool{opacity:.55}.bk-ex-zh{margin:0;font:400 1.6rem/2 var(--font-hanzi);overflow-wrap:anywhere}.bk-ex-zh[data-big=true]{font-size:3rem;line-height:1.15}.bk-ex-zhs{font-family:var(--font-hanzi);font-size:1.1em}.bk-ex-py{font:400 .92em/1.3 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-ex-en{margin:0;font:400 1.3rem/1.45 var(--font-prose)}.bk-ex-en-sm{margin:0;font:400 1rem/1.4 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-ex-q{margin:0;font:400 1.02rem/1.5 var(--font-prose)}.bk-ex-qen{display:block;margin-top:2px;color:rgb(var(--c-ink-soft));font-size:.95rem}.bk-ex-help{margin:8px 0 0;font:400 .92rem/1.45 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-ex-gw{display:inline-block;white-space:nowrap}.bk-ex-gap{display:inline-block;min-width:3.2em;margin:0 .12em;padding:0 .2em;border-bottom:2px solid rgb(var(--c-ink));line-height:1.3;text-align:center;vertical-align:baseline}.bk-ex-gap[data-v=right]{color:rgb(var(--c-ok));border-color:rgb(var(--c-ok))}.bk-ex-gap[data-v=wrong]{color:rgb(var(--c-wrong));border-color:rgb(var(--c-wrong));text-decoration:line-through;text-decoration-thickness:2px}.bk-ex-gap[data-input=true]{padding:0}.bk-ex-gap[data-input=true]:focus-within{background:rgb(var(--c-ink) / .06);outline:2px solid rgb(var(--c-ink));outline-offset:2px}.bk-ex-gap-in{max-width:10em;min-width:3em;padding:0 .1em;border:0;outline:none;background:transparent;color:inherit;font:inherit;text-align:center;text-decoration:inherit}.bk-ex-gap-in:disabled{opacity:1;-webkit-text-fill-color:currentColor}.bk-ex-opts{display:grid;gap:8px;margin-top:12px}.bk-ex-opts[data-bank=true]{display:flex;flex-wrap:wrap}.bk-ex-opt{display:flex;flex-wrap:wrap;align-items:center;-moz-column-gap:10px;column-gap:10px;row-gap:2px;min-height:48px;margin:0;padding:6px 12px;border:2px solid rgb(var(--c-ink));background:transparent;color:rgb(var(--c-ink));text-align:left;cursor:pointer;touch-action:manipulation;transition:background-color .12s ease,color .12s ease}.bk-ex-opt .bk-kbd{background:rgb(var(--c-lift))}.bk-ex-o-t{font:400 1.25rem/1.25 var(--font-hanzi);overflow-wrap:anywhere}.bk-ex-o-py{font:400 .9rem/1.2 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-ex-o-m{display:grid;margin-left:auto}.bk-ex-o-m svg{width:18px;height:18px}.bk-ex-opt[aria-checked=true]{background:rgb(var(--c-ink));color:rgb(var(--c-paper))}.bk-ex-opt[aria-checked=true] .bk-ex-o-py{color:rgb(var(--c-paper) / .8)}.bk-ex-opt[aria-checked=true] .bk-kbd,.bk-ex-opt[data-v] .bk-kbd{background:transparent}.bk-ex-opt:disabled{cursor:default}@media(hover:hover)and (pointer:fine){.bk-ex-opt:not(:disabled):not([aria-checked=true]):hover{background:rgb(var(--c-ink) / .08)}}.bk-ex:is([data-state=right],[data-state=wrong],[data-state=flagged]) .bk-ex-opt:not([data-v]){opacity:.5}.bk-ex-opt[data-v=right]{background:rgb(var(--c-ok));border-color:rgb(var(--c-ok));color:rgb(var(--c-paper))}.bk-ex-opt[data-v=right] .bk-ex-o-py{color:rgb(var(--c-jade-soft))}.bk-ex-opt[data-v=answer]{background:var(--ok-soft);border-color:rgb(var(--c-ok));color:rgb(var(--c-ok))}.bk-ex-opt[data-v=answer] .bk-ex-o-py{color:rgb(var(--c-ok))}.bk-ex-opt[data-v=wrong]{background:var(--wrong-soft);border-color:rgb(var(--c-wrong));color:rgb(var(--c-wrong))}.bk-ex-opt[data-v=wrong] .bk-ex-o-t{text-decoration:line-through;text-decoration-thickness:2px}.bk-ex-opt[data-v=wrong] .bk-ex-o-py{color:rgb(var(--c-wrong))}.bk-ex-slots{display:flex;flex-wrap:wrap;align-items:flex-end;gap:8px;min-height:58px;padding:6px 0;border-bottom:2px solid rgb(var(--c-ink))}.bk-ex-slot-rest{flex:1;min-width:2em}.bk-ex-slot-end{padding-bottom:6px;font:400 1.4rem/1 var(--font-hanzi)}.bk-ex-tile{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0 12px;border:2px solid rgb(var(--c-ink));background:rgb(var(--c-lift));color:rgb(var(--c-ink));font:400 1.3rem/1 var(--font-hanzi);cursor:pointer;touch-action:manipulation}.bk-ex-tile .bk-kbd{min-width:18px;height:18px;font-size:.7rem}.bk-ex-slots .bk-ex-tile{background:transparent}.bk-ex-tile:disabled{cursor:default}.bk-ex-tile[data-v=right]{border-color:rgb(var(--c-ok));background:var(--ok-soft);color:rgb(var(--c-ok))}.bk-ex-tile[data-v=wrong]{border-color:rgb(var(--c-wrong));background:var(--wrong-soft);color:rgb(var(--c-wrong))}@media(hover:hover)and (pointer:fine){.bk-ex-tile:not(:disabled):hover{background:rgb(var(--c-ink) / .08)}}.bk-ex-pool{display:flex;flex-wrap:wrap;gap:8px;min-height:44px;margin:14px 0 6px}.bk-ex-pool-empty{align-self:center;font:400 .92rem/1.4 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-ex-box,.bk-ex-line{margin-top:12px}.bk-ex-box textarea,.bk-ex-box input{display:block;width:100%;min-height:48px;padding:10px 12px;border:2px solid rgb(var(--c-ink) / .55);border-radius:0;background:rgb(var(--c-well));color:rgb(var(--c-ink));font:400 1.2rem/1.5 var(--font-hanzi);resize:vertical}.bk-ex-box textarea:focus,.bk-ex-box input:focus{outline:2px solid rgb(var(--c-ink));outline-offset:2px;border-color:rgb(var(--c-ink));background:rgb(var(--c-well-focus))}.bk-ex-line input{display:block;width:100%;min-height:46px;padding:6px 2px 4px;border:0;border-bottom:2px solid rgb(var(--c-ink));border-radius:0;background:transparent;color:rgb(var(--c-ink));font:400 1.25rem/1.4 var(--font-hanzi)}.bk-ex-line input:focus{outline:2px solid rgb(var(--c-ink));outline-offset:2px}.bk-ex-box :is(textarea,input)::-moz-placeholder,.bk-ex-line input::-moz-placeholder{color:rgb(var(--c-ink-soft) / .9);font-family:var(--font-prose);font-size:1rem}.bk-ex-box :is(textarea,input)::placeholder,.bk-ex-line input::placeholder{color:rgb(var(--c-ink-soft) / .9);font-family:var(--font-prose);font-size:1rem}.bk-ex-box[data-v=right] :is(textarea,input),.bk-ex-line[data-v=right] input{border-color:rgb(var(--c-ok));color:rgb(var(--c-ok))}.bk-ex-box[data-v=wrong] :is(textarea,input),.bk-ex-line[data-v=wrong] input{border-color:rgb(var(--c-wrong));color:rgb(var(--c-wrong))}.bk-ex-box :is(textarea,input):disabled,.bk-ex-line input:disabled{opacity:1;-webkit-text-fill-color:currentColor;cursor:default}.bk-ex-fb{display:grid;gap:6px;margin-top:14px;padding:12px 14px;border:2px solid rgb(var(--c-ok));background:var(--ok-soft);font:400 1rem/1.5 var(--font-prose);animation:bk-ex-fb-in .18s var(--ease-out) backwards}@keyframes bk-ex-fb-in{0%{opacity:0;transform:translateY(4px)}}.bk-ex-fb[data-v=wrong]{border-color:rgb(var(--c-wrong));background:var(--wrong-soft)}.bk-ex-fb p{margin:0}.bk-ex-v svg{width:20px;height:20px;margin-right:6px;vertical-align:-4px;color:rgb(var(--c-ok))}.bk-ex-v b{margin-right:4px;font-family:var(--font-ui);color:rgb(var(--c-ok))}.bk-ex-fb[data-v=wrong] .bk-ex-v :is(b,svg){color:rgb(var(--c-wrong))}.bk-ex-fix{font:400 1.35rem/1.6 var(--font-hanzi)}.bk-ex-fix del{color:rgb(var(--c-wrong));text-decoration-thickness:2px}.bk-ex-fix ins{color:rgb(var(--c-ok));text-decoration:none;border-bottom:2px solid rgb(var(--c-ok))}.bk-ex-ai{display:flex;align-items:center;gap:6px;font:500 .86rem/1.35 var(--font-ui)!important;color:rgb(var(--c-ink-soft))}.bk-ex-ai svg{width:16px;height:16px;flex:none}.bk-ex-flagbtn{justify-self:start;display:inline-flex;align-items:center;gap:6px;min-height:40px;margin-top:2px;padding:0 12px;border:2px solid rgb(var(--c-ink));background:transparent;color:rgb(var(--c-ink));font:600 .9rem/1 var(--font-ui);cursor:pointer;touch-action:manipulation}.bk-ex-flagbtn svg{width:16px;height:16px}@media(hover:hover)and (pointer:fine){.bk-ex-flagbtn:hover{background:rgb(var(--c-ink) / .08)}}.bk-ex-flagged{display:flex;flex-wrap:wrap;align-items:flex-start;gap:8px;margin-top:2px;padding:8px 10px;border:2px dashed rgb(var(--c-ink));background:rgb(var(--c-lift) / .7);font:400 .95rem/1.45 var(--font-prose);color:rgb(var(--c-ink))}.bk-ex-flagged>svg{width:18px;height:18px;flex:none;margin-top:2px}.bk-ex-flagged p{flex:1 1 12rem;min-width:0}.bk-ex-flagged b{font-family:var(--font-ui)}.bk-ex-stamp{align-self:center;margin-left:auto}.bk-stamp[data-tone=ink]{--stamp-ink: var(--c-ink)}.bk-ex-chop{--r: -7deg;padding:.2em .4em;border:3px double currentColor;font:900 1.05rem/1 var(--font-hanzi);letter-spacing:.15em;opacity:.85}.bk-ex-act{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:10px 12px;margin-top:16px}.bk-ex-keys{display:inline-flex;flex-wrap:wrap;align-items:center;gap:4px;margin-right:auto;font:500 .84rem/1.2 var(--font-ui);color:rgb(var(--c-ink-soft))}@container (max-width: 400px){.bk-ex-keys{display:none}}.bk-ex-hints{display:grid;justify-items:start;gap:8px;margin-top:12px}.bk-ex-hints ol{margin:0;padding:10px 14px 10px 32px;border:2px solid rgb(var(--c-ink));font:400 .98rem/1.6 var(--font-prose)}.bk-ex-hints .bk-ex-zhs{font-size:1.15rem}.bk-ex-playbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px 12px}.bk-ex-played{font:500 .86rem/1.2 var(--font-ui);color:rgb(var(--c-ink-soft))}.bk-ex-transcript{margin:10px 0 0;font:400 1rem/1.5 var(--font-prose)}.bk-ex-playbar+.bk-ex-zh{margin-top:10px}.bk-ex-dlg{display:grid;gap:6px}.bk-ex-dlg p{display:grid;grid-template-columns:1.6em minmax(0,1fr);gap:8px;margin:0;font:400 1.25rem/1.9 var(--font-hanzi)}.bk-ex-dlg b{font:700 1rem/2.3 var(--font-ui);font-stretch:125%}.bk-ex-prose{margin:0;font:400 1.25rem/2 var(--font-hanzi)}.bk-ex-pron-w{display:grid;justify-items:center;gap:2px;padding:6px 0;text-align:center}.bk-ex-pron-w p{margin:0}.bk-ex-pron-acts{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}.bk-ex-pron-acts>.bk-btn{flex:1 1 140px}.bk-ex-rec{display:flex;align-items:center;gap:12px;margin-top:8px;font:600 .95rem/1 var(--font-ui)}.bk-ex-lvl{display:inline-flex;align-items:flex-end;gap:3px;height:28px}.bk-ex-lvl i{width:6px;background:rgb(var(--c-ink));animation:bk-ex-lvl .9s ease-in-out infinite alternate}.bk-ex-lvl i:nth-child(1){height:30%;animation-delay:-.2s}.bk-ex-lvl i:nth-child(2){height:70%;animation-delay:-.5s}.bk-ex-lvl i:nth-child(3){height:100%}.bk-ex-lvl i:nth-child(4){height:55%;animation-delay:-.35s}.bk-ex-lvl i:nth-child(5){height:25%;animation-delay:-.65s}@keyframes bk-ex-lvl{to{transform:scaleY(.4)}}.bk-ex-lvl i{transform-origin:bottom}.bk-ex-score{display:grid;gap:10px;margin-top:4px}.bk-ex-sc{display:flex;align-items:baseline;gap:4px;margin:0}.bk-ex-sc .bk-folio{font-size:3rem;line-height:1}.bk-ex-sc small{font:600 1rem/1 var(--font-ui);color:rgb(var(--c-ink-soft))}.bk-ex-score[data-v=right] .bk-ex-sc .bk-folio{color:rgb(var(--c-ok))}.bk-ex-score[data-v=wrong] .bk-ex-sc .bk-folio{color:rgb(var(--c-wrong))}.bk-ex-meter{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:10px;margin:0;font:500 .9rem/1 var(--font-ui)}.bk-ex-m{height:8px;background:rgb(var(--c-ink) / .14)}.bk-ex-m i{display:block;height:100%;background:rgb(var(--c-ok))}.bk-ex-score[data-v=wrong] .bk-ex-m i{background:rgb(var(--c-wrong))}.bk-ex-thread{display:grid;gap:10px}.bk-ex-cv{display:grid;gap:2px;max-width:88%;padding:8px 12px;border:2px solid rgb(var(--c-ink))}.bk-ex-cv p{margin:0;font:400 1.15rem/1.6 var(--font-hanzi)}.bk-ex-cv-who{font:600 .8rem/1.2 var(--font-ui);color:rgb(var(--c-ink-soft))}.bk-ex-cv-who [lang]{margin-left:2px;letter-spacing:.12em}.bk-ex-cv[data-who=tutor]{background:rgb(var(--c-well))}.bk-ex-cv[data-who=you]{justify-self:end;border-color:rgb(var(--c-ink) / .55)}.bk-ex-cv .bk-ex-writing{font:italic 400 .98rem/1.5 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-ex-thread .bk-ex-fb{max-width:92%;margin-top:0}.bk-ex-cv-turn{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;margin:12px 0 0;font:500 .88rem/1.2 var(--font-ui);color:rgb(var(--c-ink-soft))}.bk-ex-linkbtn{min-height:36px;padding:0 4px;border:0;background:none;color:rgb(var(--c-ink));font:600 .9rem/1 var(--font-ui);cursor:pointer}.bk-ex-cv-bar{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:end;gap:8px;margin-top:12px}.bk-ex-cv-bar .bk-ex-line{margin:0}.bk-ex-cv-bar .bk-ex-line input{font-size:1.05rem}.bk-ex-cv-bar .bk-btn:not(:has(span:not(:empty))){padding-inline:10px}.bk-flag-hint{margin:0 0 12px;font:400 .98rem/1.5 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-flag-what{margin:0 0 12px;padding:8px 10px;border-left:3px solid rgb(var(--c-ink) / .4);font:400 1.05rem/1.55 var(--font-hanzi);overflow-wrap:anywhere}.bk-flag-why{display:flex;flex-direction:column;align-items:stretch;margin-bottom:14px}.bk-flag-why>button{min-height:44px;text-align:left;white-space:normal}.bk-flag-why>button+button{margin-left:0;margin-top:-2px}.bk-flag-why>button[aria-checked=true]{background:rgb(var(--c-ink));color:rgb(var(--c-paper))}.bk-flag-count{float:right;font:700 .85rem/1.3 var(--font-ui);font-stretch:125%;font-variant-numeric:tabular-nums;color:rgb(var(--c-ink-soft))}.bk-flag-tools{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px;margin-top:14px}.bk-flag-sent{display:flex;align-items:center;gap:8px;margin:4px 0 8px;font:400 1.02rem/1.45 var(--font-prose)}.bk-flag-sent b{font-family:var(--font-ui);color:rgb(var(--c-ok))}.bk-flag-sent svg{width:20px;height:20px;flex:none;color:rgb(var(--c-ok))}.bk-look-sheet[data-side=bottom]{max-height:62dvh}.bk-look-sheet[data-side=right]{width:min(24rem,100vw)}.bk-look-word{font:400 2.1rem/1.15 var(--font-hanzi);overflow-wrap:anywhere}.bk-look{display:grid;gap:8px}.bk-look p{margin:0}.bk-look-py{font:400 1.1rem/1.35 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-look-en{font:400 1.12rem/1.5 var(--font-prose)}.bk-look-also{font:400 .95rem/1.45 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-look-tags{display:flex;flex-wrap:wrap;gap:6px}.bk-look-chip{padding:1px 8px;border:1.5px solid rgb(var(--c-ink) / .55);font:500 .82rem/1.5 var(--font-ui)}.bk-look-note{font:italic 400 .95rem/1.5 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-look-more{font:500 .85rem/1.3 var(--font-ui);color:rgb(var(--c-ink-soft))}.bk-look-sec{margin-top:6px;padding-top:10px;border-top:2px solid rgb(var(--c-ink) / .15)}.bk-look-sec h3{margin:0 0 2px;font:600 .85rem/1.3 var(--font-ui);color:rgb(var(--c-ink-soft))}.bk-look-state{font:700 1.02rem/1.4 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rgb(var(--c-ink) / .12);background:none;color:inherit;font:inherit;text-align:left;text-decoration:none}:is(a,button).bk-toc-row{cursor:pointer;touch-action:manipulation;transition:background-color .15s ease}@media(hover:hover)and (pointer:fine){:is(a,button).bk-toc-row:hover{background:rgb(var(--c-ink) / .05)}:is(a,button).bk-toc-row:hover .bk-toc-label{text-decoration:underline;text-underline-offset:.2em;text-decoration-thickness:1px}}.bk-toc-row[data-current=true]{box-shadow:inset 4px 0 rgb(var(--c-ink));padding-left:14px}.bk-toc-row[aria-disabled=true]{color:rgb(var(--c-ink) / .55)}.bk-toc-name{display:flex;flex-wrap:wrap;align-items:baseline;-moz-column-gap:10px;column-gap:10px;row-gap:2px;min-width:0}.bk-toc-zh{font:400 1.2rem/1.3 var(--font-hanzi);letter-spacing:.06em}.bk-toc-label{font:600 1rem/1.3 var(--font-ui);overflow-wrap:anywhere}.bk-toc-meta{flex-basis:100%;font:400 .9rem/1.4 var(--font-prose);color:rgb(var(--c-ink-soft))}.bk-toc-leader{align-self:end;margin-bottom:.4em;border-bottom:2px dotted rgb(var(--c-ink) / .45)}.bk-toc-folio{font:700 1.1rem/1.2 var(--font-ui);font-stretch:125%;font-variant-numeric:tabular-nums;text-align:right;white-space:nowrap}.bk-toc-folio svg{width:18px;height:18px;vertical-align:-3px}@media(max-width:420px){.bk-toc-row{grid-template-columns:minmax(0,1fr) auto}.bk-toc-leader{display:none}.bk-toc-folio{white-space:normal;max-width:9rem}}.bk-bench-states{display:grid;gap:28px 24px;grid-template-columns:repeat(auto-fill,minmax(min(100%,340px),1fr));align-items:start}.bk-bench-entry{padding:14px 16px;border:2px solid rgb(var(--c-ink) / .2);background:rgb(var(--c-panel))}.bk-bench-word{padding:0 .04em;border:0;border-radius:2px;background:none;color:inherit;font:inherit;cursor:pointer}.bk-bench-word:hover{background:rgb(var(--c-ink) / .07)}@media(prefers-reduced-motion:reduce){.bk-ex-fb,.bk-ex-lvl 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