:root{--paper:#fffefa;--canvas:#f8f8f5;--ink:#242321;--muted:#85817a;--line:#e4e1da;--accent:#8e5d6c;--accent-soft:#f3e8eb;--serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;--sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}body{min-width:280px;margin:0;background:var(--canvas);color:var(--ink);font:15px/1.65 var(--sans);-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #8e5d6c40;outline-offset:3px}a{color:inherit}main{width:min(calc(100% - 32px),1120px);margin:auto;padding:44px 0 35px}.pack-header{margin-bottom:25px;text-align:center}.pack-brand{margin:0 0 6px;color:#66625b;font:14px var(--serif);letter-spacing:2px}h1{margin:0;font:700 clamp(22px,4vw,28px)/1.25 var(--serif);letter-spacing:1px}.lesson-meta{margin:12px 0 0;color:var(--muted);font-size:12px}h2{font:700 22px/1.5 var(--serif);margin:8px 0 14px}h3{font-size:14px;margin:23px 0 10px}p{margin:10px 0}.text-button{border:0;background:transparent;color:#6f6960;font-size:12px;padding:5px 0}.text-button:hover{text-decoration:underline;text-underline-offset:4px}.lesson-bar{display:flex;justify-content:space-between;align-items:center;margin:0 0 10px}#completion{font-size:12px;color:var(--muted)}.steps{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));max-width:820px;margin:0 auto 30px;border-bottom:1px solid var(--line)}.step{min-height:44px;margin-bottom:-1px;padding:8px 8px;border:0;border-bottom:2px solid transparent;background:transparent;color:#6f6960;font-size:13px}.step.active{border-bottom-color:var(--accent);color:var(--accent);font-weight:700}.workspace{display:grid;grid-template-columns:minmax(290px,.85fr) minmax(360px,1.15fr);gap:28px;align-items:start}.chart-card{border:1px solid var(--line);border-radius:10px;background:var(--paper);padding:20px;position:sticky;top:76px}.card-top{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:12px}.chart-card h2{font:600 15px/1.6 var(--sans);padding:6px;margin:13px 0 5px;text-align:center;border:1px solid transparent;border-radius:4px}.chart-card h2.highlight{background:var(--accent-soft);border-color:#d4b8c0}#chart svg{display:block;width:100%;height:220px;overflow:visible}.sector{transition:opacity .2s}.sector.dim{opacity:.18}.legend{display:grid;grid-template-columns:1fr 1fr;gap:6px}.legend button{border:1px solid transparent;background:#f5f5f0;border-radius:4px;display:flex;align-items:center;gap:7px;padding:9px 7px;font-size:11px;text-align:left}.legend button.focus{border-color:#bba5ad;background:var(--accent-soft)}.dot{display:inline-block;width:8px;height:8px;border-radius:50%;flex-shrink:0}.legend strong{margin-left:auto;font:600 13px Georgia}.activity{padding:12px 6px 20px;min-height:460px}.stage-meta{font-size:12px;color:var(--muted);margin-bottom:9px}.purpose{font-size:13px;color:#767168;margin-bottom:20px}.sentence{font:22px/1.95 "Times New Roman",Times,serif;background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:17px;margin:18px 0 22px}.blank{font:inherit;display:inline;border:0;border-bottom:1px dashed #b69aa3;background:var(--accent-soft);color:#785564;padding:0 5px;margin:1px 0}.blank.current{background:#eadce1}.blank.filled{border-bottom:1px solid #b69aa3}.question-count{font-size:12px;color:var(--muted);margin-bottom:7px}.question-label{font-size:14px;font-weight:600;margin-bottom:12px}.options{display:grid;gap:10px}.option{display:flex;gap:12px;align-items:center;min-height:50px;background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:12px 14px;text-align:left;font-size:14px;line-height:1.6;overflow-wrap:anywhere}.option .letter{color:var(--muted);font-size:12px;flex-shrink:0}.option:hover:not(:disabled){border-color:#ba9da7;background:#faf6f7}.option.correct{border-color:#9eafa0;background:#eff4ed;opacity:1}.option.wrong{border-color:#c6a192;background:#faf0eb;opacity:1}.feedback{font-size:12px;line-height:1.9;margin:14px 0 0;padding:12px;background:#eff4ed;border-radius:5px}.feedback.error{background:#faf0eb;color:#915948}.actions{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-top:23px}.primary,.secondary{padding:10px 18px;border-radius:5px;font-size:13px}.primary{border:1px solid var(--accent);color:#fff;background:var(--accent)}.primary:hover{background:#794b59}.secondary{border:1px solid var(--line);background:var(--paper)}.tiny,.muted{font-size:12px;color:var(--muted)}details{font-size:12px;color:#767168;margin-top:17px}summary{cursor:pointer}.template{font:16px/1.8 "Times New Roman",serif;background:var(--paper);padding:12px;margin-top:10px}.locked-note{font-size:12px;color:var(--muted);margin-top:18px}.vocab{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:15px 0 25px}.vocab div{border-bottom:1px solid var(--line);padding:9px 0}.vocab b{font:17px "Times New Roman",serif;display:block}.vocab span{font-size:12px;color:#767168}.sample-line{display:block;width:100%;background:none;border:0;text-align:left;font:19px/1.9 "Times New Roman",serif;padding:8px;border-radius:4px;margin:3px 0}.sample-line:hover,.sample-line.selected{background:var(--accent-soft)}.translation{font-size:13px;line-height:1.9;color:#6f6960;padding:12px;background:var(--paper);border:1px solid var(--line);border-radius:5px}footer{display:flex;justify-content:space-between;align-items:start;border-top:1px solid var(--line);padding:16px 0;margin-top:30px;color:var(--muted);font-size:11px}.preview-settings{margin:0;text-align:right;font-size:11px}.preview-settings label{display:block;margin-top:10px}select{border:1px solid var(--line);border-radius:4px;background:var(--paper);padding:4px 8px;font-size:12px}.storage-warning{color:#a14f31!important}dialog{color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:25px;width:min(650px,92vw);max-height:86vh;background:var(--paper)}dialog::backdrop{background:#24232160}.dialog-head{display:flex;justify-content:space-between;align-items:center}.close{border:0;background:none;font-size:24px;width:35px;height:35px;line-height:1}#source{width:min(850px,94vw)}#source img{width:100%;display:block}.catalog-row{display:flex;align-items:center;gap:12px;width:100%;border:0;border-bottom:1px solid var(--line);padding:13px;background:none;text-align:left}.catalog-row.active{background:var(--accent-soft)}.catalog-row .status{margin-left:auto;font-size:11px;white-space:nowrap}.idx{font-size:12px;color:var(--muted)}.history-line{font-size:12px;border-bottom:1px solid var(--line);padding:8px 0}
@media(max-width:900px){.workspace{gap:18px;grid-template-columns:minmax(270px,.85fr) minmax(330px,1.15fr)}.chart-card{padding:15px}.sentence{font-size:20px}.step{font-size:12px}}
@media(max-width:700px){main{padding-top:28px}.pack-header{margin-bottom:20px}.steps{margin-bottom:20px}.step{padding:8px 2px;font-size:11px;min-height:42px}.workspace{display:flex;flex-direction:column;gap:17px}.chart-card,.activity{width:100%}.chart-card{top:50px;z-index:2;display:grid;grid-template-columns:108px 1fr;gap:0 8px;padding:13px}.card-top,.chart-card h2,.chart-card h2{font-size:12px;padding:3px;margin:4px 0}#chart svg{height:112px}.legend{align-content:center;gap:4px}.legend button{padding:6px;font-size:10px;flex-wrap:wrap;gap:3px}.legend strong{font-size:12px}.activity{padding:8px 0 15px;min-height:0;scroll-margin-top:310px}.activity h2{font-size:21px}.sentence{font-size:21px;padding:13px}.actions .primary{margin-left:auto}.catalog-row{font-size:12px;padding:12px 5px}.sample-line{font-size:18px}dialog{padding:20px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.exercise-question{margin:22px 0;scroll-margin-top:80px}.answer-status{font-size:12px;color:#4d7050;margin:8px 0}.answer-status.error{color:#915948}.restart-link{margin-top:22px}.activity{scroll-margin-top:76px}
@media(max-width:700px){.activity,.exercise-question{scroll-margin-top:320px}}
.build-instruction{font-size:12px;color:var(--muted);margin:12px 0}.builder-answer{display:flex;flex-wrap:wrap;gap:7px;align-items:center;min-height:55px;padding:12px;border:1px solid var(--line);border-radius:6px;background:var(--paper)}.build-slot{min-width:55px;min-height:35px;padding:5px 9px;border:1px dashed #cfbfc4;border-radius:4px;background:#f5f1f2;color:#8a727a;font:18px/1.4 "Times New Roman",serif;touch-action:manipulation}.build-slot.filled{border-style:solid;background:var(--accent-soft);color:var(--ink)}.word-bank{display:flex;flex-wrap:wrap;gap:8px;padding:12px 0}.word-token{padding:7px 11px;min-height:38px;border:1px solid #dccbd1;border-radius:5px;background:var(--accent-soft);color:#795260;font:18px/1.4 "Times New Roman",serif;touch-action:manipulation;user-select:none}.word-token[draggable="true"]{cursor:grab}.word-token.used{color:#9b9496;background:#f4f3f1;border-color:var(--line);text-decoration:line-through}.builder-answer.correct{border-color:#9eafa0}.builder-answer.wrong{border-color:#c6a192}@media(max-width:700px){.word-token,.build-slot{font-size:17px;min-height:42px}.word-bank{gap:7px}}

main{max-width:820px}.steps{grid-template-columns:repeat(5,minmax(0,1fr))}.workspace{display:flex;flex-direction:column;gap:26px}.chart-card{position:static;display:block;width:100%;max-width:640px;margin:0 auto;z-index:auto;scroll-margin-top:75px;padding:18px 22px}.chart-card h2{margin:8px 0 2px;font-size:15px}#chart svg{height:185px}.legend{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;margin-top:6px}.legend button{padding:8px 7px;font-size:11px}.activity{width:100%;padding:8px 0 20px;scroll-margin-top:76px;min-height:0}.exercise-question{scroll-margin-top:76px}.cloze .question-label{display:block}.cloze-line{display:flex;align-items:baseline;flex-wrap:wrap;gap:9px;padding:14px;background:var(--paper);border:1px solid var(--line);border-radius:6px;font:21px/1.8 "Times New Roman",serif}.cloze-line input{width:155px;max-width:100%;padding:5px 8px;border:0;border-bottom:1px solid #b69aa3;background:var(--accent-soft);color:var(--ink);font:inherit;border-radius:3px}.cloze-line .secondary{margin-left:auto;font-family:var(--sans)}
@media(max-width:700px){.workspace{gap:22px}.chart-card{position:static;display:block;padding:14px;width:100%;scroll-margin-top:65px}.chart-card h2{font-size:13px}#chart svg{height:165px}.legend{grid-template-columns:1fr 1fr}.legend button{font-size:11px;padding:7px 10px}.activity,.exercise-question{scroll-margin-top:65px}.cloze-line{font-size:19px}.cloze-line input{width:140px}}
.workspace{scroll-margin-top:76px}@media(max-width:700px){.workspace{scroll-margin-top:65px}}

html{overflow-anchor:none;scroll-behavior:auto;scrollbar-gutter:stable}.activity{display:block}
.vocab-table{width:100%;table-layout:fixed;border-collapse:collapse;margin:12px 0 25px}.vocab-table th,.vocab-table td{padding:13px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle;overflow-wrap:break-word}.vocab-table th{width:42%;font:normal 19px/1.6 "Times New Roman",serif;padding-left:0}.vocab-table td{font-size:14px;line-height:1.8;color:#6f6960;padding-right:0}@media(max-width:700px){.vocab-table th{width:45%;font-size:17px;padding-right:10px}.vocab-table td{font-size:13px;padding-left:8px}}

.steps{grid-template-columns:repeat(4,minmax(0,1fr));margin-bottom:16px}
.workspace{gap:12px}
.chart-card{position:sticky;top:60px;z-index:3;display:grid;grid-template-columns:42% 58%;padding:10px 16px;background:var(--paper)}
.card-top,.chart-card h2{grid-column:1/-1}.card-top{line-height:1.4}.card-top .text-button{padding:0}
.chart-card h2{margin:4px 0;padding:3px;font-size:14px}
#chart svg{height:126px}.legend{grid-template-columns:1fr;align-content:center;gap:3px;margin:0}
.legend button{padding:3px 8px;font-size:11px}.legend strong{font-size:12px}
.activity{padding:0 0 12px;min-height:0}.activity h2{font-size:20px;margin:0 0 8px}
.exercise-question{margin:0;scroll-margin-top:285px}.question-label{font-size:13px;margin:0 0 7px}
.sentence{font-size:21px;line-height:1.8;padding:12px 14px;margin:0}
.sentence-clause{display:block}.sentence-clause+.sentence-clause{margin-top:5px}
.builder-answer{display:inline;padding:0;border:0;background:transparent;min-height:0}
.build-slot{min-width:36px;min-height:32px;margin:2px 1px;padding:3px 6px;font-size:20px;vertical-align:baseline}
.word-bank{padding:8px 0 0;gap:6px}.word-token{font-size:18px;padding:4px 9px;min-height:34px}
.inline-spelling{width:145px;max-width:100%;font:inherit;padding:0 5px;border:0;border-bottom:1px solid #b69aa3;background:var(--accent-soft);border-radius:2px}
.options{grid-template-columns:1fr 1fr;gap:10px}.option{justify-content:center;align-items:center;text-align:center;min-height:96px;padding:18px 16px}
.answer-status{height:20px;line-height:20px;margin:5px 0;flex-shrink:0}
.activity>.actions{margin-top:0;padding-top:8px}.action-end{display:flex;gap:8px;margin-left:auto}
.primary,.secondary{padding:8px 16px}.sample-line{font-size:19px;line-height:1.7;padding:6px 8px}
@media(max-width:700px){
 main{padding-top:18px}.pack-header{margin-bottom:14px}.lesson-meta{margin-top:6px}.steps{margin-bottom:12px}
 .chart-card{top:50px;padding:7px 10px;grid-template-columns:40% 60%}.chart-card h2{font-size:12px}#chart svg{height:105px}
 .legend button{padding:2px 5px;font-size:10px;flex-wrap:nowrap}.legend strong{font-size:11px}.legend{gap:2px}
 .workspace{gap:10px}.activity h2{font-size:18px}.sentence{font-size:19px;line-height:1.7;padding:9px 10px}
 .build-slot{font-size:18px;min-width:29px;min-height:32px;padding:2px 4px}.word-token{font-size:17px;min-height:36px}
 .inline-spelling{width:125px}.exercise-question{scroll-margin-top:235px}.sample-line{font-size:18px}
}

.spelling-unit{display:inline-block;white-space:nowrap}

.hinted-word{display:inline-flex;align-items:baseline;white-space:nowrap;background:var(--accent-soft);border-bottom:1px solid #b69aa3;border-radius:2px;padding-left:5px;margin:0 2px}.hinted-word .inline-spelling{border:0;padding:0 4px 0 1px;min-width:60px;background:transparent}.hinted-word.invalid{border-color:#a14f31}.hinted-word:focus-within{outline:2px solid #8e5d6c40;outline-offset:2px}.hinted-word .inline-spelling:focus-visible{outline:none}
.build-slot.answer-correct,.hinted-word.answer-correct,.inline-spelling.answer-correct{border-color:#8da38f;background:#eff4ed;color:#355b3d}.build-slot.answer-wrong,.hinted-word.answer-wrong,.inline-spelling.answer-wrong{border-color:#bf9183;background:#faf0eb;color:#874e3a}

.sample-text{color:inherit;text-decoration:none;cursor:pointer}.speaker-button{display:inline-grid;width:29px;height:29px;place-items:center;margin-left:2px;padding:0;border:1px solid #dccbd0;border-radius:50%;color:#8e5d6c;background:#fffafb;cursor:pointer;vertical-align:-.34em}.speaker-button svg{display:block}.speaker-button:hover{border-color:#b98f9b;background:#f7ecef}.speaker-button.is-playing{color:#fff;background:#8e5d6c}#audio-status{font-size:12px;color:#915948}#audio-status:empty{display:none}
@media(max-width:700px){.speaker-button{width:28px;height:28px}}

.sample-ending{white-space:nowrap;display:inline-block}.sample-tail{cursor:pointer}

.chart-card{display:block;max-width:680px;padding:12px 24px 14px;background:#fff;top:58px}
#chart{width:100%;max-width:400px;margin:8px auto 0}
#chart svg{display:block;width:100%;height:auto;overflow:hidden}
.chart-card h2{font-size:16px;line-height:1.5;margin:5px auto 0;padding:5px 8px;width:fit-content;max-width:100%;color:#171717}
:root{--chart-focus:#8b6684;--chart-glow:rgba(139,102,132,.32)}
.chart-card h2.highlight{background:#fff;border-color:var(--chart-focus);box-shadow:0 0 0 1px var(--chart-glow);animation:chart-title-breathe 3.2s ease-in-out infinite}
.chart-hit{fill:transparent;stroke:none;cursor:pointer}
.region-outline{pointer-events:none;filter:drop-shadow(0 0 3px var(--chart-glow))}
.outline-underlay{fill:none;stroke:#fff;stroke-width:9;stroke-linejoin:round}
.outline-edge{fill:none;stroke:var(--chart-focus);stroke-width:4.5;stroke-linejoin:round;animation:chart-edge-breathe 3.2s ease-in-out infinite}
.label-outline{fill:none;stroke:var(--chart-focus);stroke-width:3;animation:chart-edge-breathe 3.2s ease-in-out infinite}
.outline-halo{fill:none;stroke:var(--chart-focus);stroke-width:6;stroke-linejoin:round;opacity:.2;animation:chart-halo-breathe 3.2s ease-in-out infinite}
.chart-intro{fill:none;stroke:var(--chart-focus);stroke-width:3;pointer-events:none;animation:chart-entry-breathe 3.2s ease-in-out 3;filter:drop-shadow(0 0 3px var(--chart-glow))}
.chart-region:focus-visible .chart-hit{stroke:var(--chart-focus);stroke-width:3}
.word-bank{justify-content:center}
@keyframes chart-edge-breathe{0%,100%{opacity:.72}50%{opacity:1}}
@keyframes chart-halo-breathe{0%,100%{stroke-width:6;opacity:.12}50%{stroke-width:20;opacity:.26}}
@keyframes chart-entry-breathe{0%,100%{stroke-width:3;opacity:.65;filter:drop-shadow(0 0 2px var(--chart-glow))}50%{stroke-width:9;opacity:1;filter:drop-shadow(0 0 9px var(--chart-glow))}}
@keyframes chart-title-breathe{0%,100%{box-shadow:0 0 0 1px rgba(139,102,132,.10),0 2px 5px rgba(139,102,132,.12)}50%{box-shadow:0 0 0 5px rgba(139,102,132,.14),0 3px 13px rgba(139,102,132,.28)}}
@media(max-width:700px){.chart-card{top:50px;padding:10px 18px 12px}.chart-card h2{font-size:13px;padding:4px;margin-top:2px}#chart{max-width:360px;margin-top:6px}.word-bank{gap:7px;padding-top:10px}}
@media(prefers-reduced-motion:reduce){.region-outline,.outline-edge,.label-outline,.outline-halo,.chart-intro,.chart-card h2.highlight{animation:none}.outline-halo{stroke-width:10;opacity:.12}}

.workspace{position:sticky;top:62px;display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(0,1fr);height:calc(100svh - 78px);gap:12px;align-items:stretch}
.chart-card{position:static;align-self:start;width:100%}
#chart{max-width:360px}
.activity{min-height:0;overflow-y:auto;overscroll-behavior-y:contain;scrollbar-gutter:stable;scroll-behavior:auto;padding:0 6px 6px}
.activity>.actions{margin-top:12px}
@media(max-width:700px){.workspace{top:50px;height:calc(100svh - 62px);gap:10px}.activity{padding:0 3px 6px}.chart-card{top:auto}#chart{max-width:360px}}
@media(max-height:700px) and (min-width:701px){#chart{max-width:300px}}
@media(min-width:701px) and (min-height:701px) and (max-height:850px){#chart{max-width:330px}.chart-card{padding-top:10px;padding-bottom:10px}}
main{padding-bottom:0}.workspace{grid-template-rows:auto minmax(0,1fr) auto;gap:10px}.workspace>footer{margin:0;padding:4px 0;min-height:27px}.activity>.actions{padding-top:4px}.activity .answer-status{margin:3px 0}.activity h2{margin-bottom:4px}
@media(min-width:701px) and (min-height:701px) and (max-height:850px){#chart{max-width:320px}}
.activity .sentence{padding:10px 12px}.exercise-question .question-label{margin-bottom:4px}.activity .answer-status{height:auto;min-height:18px;line-height:18px;margin:2px 0}.activity>.actions{padding-top:2px}


.lesson-bar{gap:18px;flex-wrap:wrap}
#completion{flex-shrink:0}
#catalog-categories{display:flex;justify-content:center;gap:8px;flex:1;flex-wrap:wrap}
.category-button{border:1px solid transparent;border-radius:5px;background:none;padding:6px 12px;color:#6f6960;font-size:13px;white-space:nowrap}
.category-button:hover{background:#eeede8}
.category-button[aria-expanded="true"]{border-color:#cbbcc0;background:var(--accent-soft);color:var(--accent)}
.category-count{margin-left:7px;font-size:11px;color:var(--muted)}
#catalog-panel{margin:0 0 18px;padding:12px 18px;border:1px solid var(--line);border-radius:8px;background:var(--paper)}
#catalog-panel[hidden]{display:none}
.catalog-panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:13px}
#catalog-list{overflow:visible}
.catalog-buttons{display:grid;grid-template-columns:repeat(var(--catalog-count),minmax(0,1fr));gap:10px;margin-top:10px}
.catalog-group h3{font-size:13px;margin:15px 0 4px;color:#6f6960}
.catalog-row{display:flex;flex-direction:column;align-items:flex-start;gap:5px;min-width:0;padding:12px 10px;border:1px solid var(--line);border-radius:6px;background:var(--paper);font-size:13px;line-height:1.5}
.catalog-row:hover:not(:disabled){border-color:#b69aa3}
.catalog-row.active{border-color:#cbbcc0;background:var(--accent-soft)}
.catalog-row .status{margin: auto 0 0;padding-top:5px}
.catalog-row .idx{font-size:11px}
.catalog-row:disabled{opacity:1;color:#928e87}
.catalog-title{min-width:0}
@media(max-width:700px){
 .lesson-bar{gap:6px;margin-bottom:12px}
 #catalog-categories{order:3;flex-basis:100%;gap:2px;justify-content:space-between}
 .category-button{padding:6px 3px;font-size:11px}
 .category-count{margin-left:3px;font-size:10px}
 #catalog-panel{padding:10px}
 .catalog-buttons{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
 .catalog-row{font-size:12px;padding:10px;gap:4px}
}


.handout-content{color:#426f98}.handout-number{color:#238249}.handout-structure{color:#b64434}
.review-table{width:100%;table-layout:fixed;border-collapse:collapse;margin:8px 0 14px;background:var(--paper)}
.review-col-step{width:12%}.review-col-template{width:27%}.review-col-sample{width:36%}.review-col-chinese{width:25%}
.review-table th,.review-table td{border:1px solid var(--line);padding:10px;vertical-align:top;overflow-wrap:break-word}
.review-table thead th{position:sticky;top:0;z-index:1;box-shadow:0 1px var(--line);font-size:12px;font-weight:600;text-align:left;background:#f5f5f2}
.review-table tbody th{font-size:12px;font-weight:500;text-align:left}
.review-step{font:inherit;line-height:1.8;text-align:left;padding:0;border:0;background:none;cursor:pointer}
.template-text{font:17px/1.7 Georgia,"Times New Roman",serif;color:inherit;text-decoration:none;cursor:pointer}
.review-table .template-cell{background:#fbfbf8}
.review-table .sample-line{font:17px/1.7 Georgia,"Times New Roman",serif;padding:0;margin:0;border-radius:0}
.review-table .translation-line{font:13px/1.9 var(--sans);color:#625e58;margin:0}
.review-table tr.selected>th,.review-table tr.selected>td{background:var(--accent-soft);border-top-color:#b99ba5;border-bottom-color:#b99ba5}
.review-table tr.selected>th{box-shadow:inset 3px 0 var(--accent)}
.review-table .sample-line:hover,.review-table .sample-line.selected{background:none}
.review-table .speaker-button{width:27px;height:27px}
@media(max-width:700px){
 .review-table,.review-table tbody{display:block;width:100%}
 .review-table colgroup,.review-table thead{display:none}
 .review-table tr{display:block;border:1px solid var(--line);border-radius:6px;margin:0 0 14px;overflow:hidden}
 .review-table th,.review-table td{display:block;width:100%;border:0;border-top:1px solid var(--line);padding:10px 12px}
 .review-table tbody th{border-top:0;background:#f5f5f2;font-size:13px}
 .review-table td:before{content:attr(data-label);display:block;font:600 12px/1.6 var(--sans);color:#777168;margin-bottom:4px}
 .review-table .template-text,.review-table .sample-line{font-size:18px;line-height:1.8}
 .review-table tr.selected{border-color:#b99ba5}
 .review-table tr.selected>td{border-color:var(--line)}
}


main{max-width:760px}.steps{max-width:none}

.spelling-unit{display:inline;white-space:normal}
.hinted-word.letter-spelling{--letter-line:#9b7b86;--letter-width:calc(1ch + .3em);font:20px/1.7 "Courier New",monospace;display:inline-flex;vertical-align:baseline;white-space:nowrap;max-width:100%;padding:2px 3px 5px;margin:3px 4px;border:0;border-radius:3px;background:transparent}
.letter-spelling .initial-letter,.letter-spelling .inline-spelling{font:inherit;box-sizing:content-box;height:1.7em;line-height:1.7em;border:0;border-radius:0;background:repeating-linear-gradient(to right,transparent 0,transparent .12em,var(--letter-line) .12em,var(--letter-line) calc(1ch + .18em),transparent calc(1ch + .18em),transparent var(--letter-width)) left bottom/100% 1px no-repeat}
.letter-spelling .initial-letter{width:calc(var(--prefix-letters,1) * var(--letter-width));text-align:center;flex-shrink:0}
.hinted-word.letter-spelling .inline-spelling{width:calc(var(--letters) * var(--letter-width));min-width:0;max-width:none;padding:0;letter-spacing:.3em;text-indent:.15em;color:inherit;outline:none;flex-shrink:0}
.letter-spelling:focus-within{outline:2px solid #8e5d6c40;outline-offset:2px}
.hinted-word.letter-spelling.answer-correct{--letter-line:#668b6b;background:#eff4ed;color:#355b3d}
.hinted-word.letter-spelling.answer-wrong{--letter-line:#bf9183;background:#faf0eb;color:#874e3a}
@media(max-width:700px){.hinted-word.letter-spelling{font-size:18px;margin:3px 2px}}

.hinted-word.letter-spelling .inline-spelling{padding:0 .15em;text-indent:0;background-size:calc(100% - .3em) 1px}


.activity>.actions{position:static;margin:12px 0 4px;padding:0;flex-shrink:0}
.activity>.vocab-table{margin-bottom:12px}
.activity>.review-table{margin-bottom:12px}
.workspace>.activity{overflow:auto;min-height:0}
.workspace>footer{position:static;align-self:stretch}


.workspace>.activity.vocabulary-view{display:flex;flex-direction:column;align-self:stretch;width:100%;max-width:680px;margin:0 auto;padding:0 0 8px;overflow:hidden;gap:22px;scrollbar-gutter:auto}
.vocab-content{min-height:0;overflow-y:auto;overscroll-behavior-y:contain;scrollbar-gutter:stable;flex:0 1 auto;padding:0 8px 4px 0}
.vocab-content .vocab-table{margin:12px 0 0}
.vocabulary-view>.vocab-actions{flex:0 0 auto;margin:0;padding:0 8px 0 0}
main{padding-bottom:32px}
.workspace{height:calc(100svh - 102px);gap:14px}
.workspace>footer{padding:12px 0 8px;min-height:40px}
@media(max-width:700px){.workspace{height:calc(100svh - 90px);gap:12px}.workspace>.activity.vocabulary-view{gap:20px;padding-bottom:8px}.vocab-content{padding-right:4px}.vocabulary-view>.vocab-actions{padding-right:4px}}


.workspace>.activity{width:100%;max-width:720px;justify-self:center}
.workspace>footer{width:100%;max-width:720px;justify-self:center}


main.review-page{max-width:1120px}
main.reading-page{padding-bottom:56px}
.workspace.reading-mode{position:static;height:auto;min-height:0;max-height:none;grid-template-rows:auto auto auto;gap:24px}
.reading-mode #chart{max-width:260px}
.reading-mode>.activity{height:auto;max-height:none;overflow:visible;scrollbar-gutter:auto;padding:0}
.review-page .reading-mode>.activity,.review-page .reading-mode>footer{max-width:1120px}
.reading-mode>.activity.vocabulary-view{display:block;height:auto;max-height:none;overflow:visible;padding:0;gap:0}
.reading-mode .vocab-content{height:auto;max-height:none;overflow:visible;scrollbar-gutter:auto;padding:0}
.reading-mode .vocab-actions{margin-top:24px;padding:0}
.reading-mode>footer{margin-top:8px;padding:14px 0 12px}
.reading-mode .review-table thead th{position:static}
@media(max-width:700px){.reading-mode #chart{max-width:240px}.workspace.reading-mode{gap:20px}main.reading-page{padding-bottom:48px}}


:root{--lesson-content-width:680px;--exercise-scrollbar-width:12px}
.chart-card{max-width:var(--lesson-content-width)}
.workspace:not(.reading-mode)>.activity{width:calc(100% + var(--exercise-scrollbar-width));max-width:calc(var(--lesson-content-width) + var(--exercise-scrollbar-width));position:relative;left:calc(var(--exercise-scrollbar-width) / 2);padding:0 0 6px;scrollbar-gutter:stable;scrollbar-width:auto}
.workspace:not(.reading-mode)>.activity::-webkit-scrollbar{width:var(--exercise-scrollbar-width)}
.workspace:not(.reading-mode)>.activity::-webkit-scrollbar-thumb{background:#c9c6c1;border:3px solid var(--canvas);border-radius:8px}
.workspace:not(.reading-mode)>.activity::-webkit-scrollbar-track{background:var(--canvas)}
.workspace:not(.reading-mode)>footer{max-width:var(--lesson-content-width)}


.chart-card[hidden]{display:none}
.workspace.vocabulary-mode{grid-template-rows:auto auto}
.vocabulary-mode .vocab-content .vocab-table{margin-top:0}

.activity .writing-stage-title{text-align:center}


.punctuated-word{display:inline-block;white-space:nowrap}


.review-page .workspace.reading-mode{row-gap:16px}
.review-page .review-table{margin-top:0}


.activity .writing-stage-title{color:var(--accent)}
.writing-title-frame{position:relative;display:inline-block}
.writing-title-space{visibility:hidden}
.writing-title-text{position:absolute;left:0;top:0;white-space:nowrap}
.writing-title-text.is-typing:after{content:"";display:inline-block;height:.85em;border-right:1px solid currentColor;margin-left:3px;vertical-align:-.05em}
.vocab-table .vocab-favorite-cell{width:44px;padding:4px 0 4px 8px;text-align:right}
.vocab-favorite{display:inline-grid;place-items:center;width:36px;height:36px;padding:0;border:0;border-radius:4px;background:transparent;color:var(--muted);font-size:23px;line-height:1}
.vocab-favorite[aria-pressed="true"]{color:var(--accent)}
.vocab-favorite:hover{background:var(--accent-soft)}
#favorite-status{font-size:12px;color:#915948;margin:8px 0 0}
#favorite-status:empty{display:none}


#steps[hidden]{display:none}
.workspace.waiting-mode{grid-template-rows:auto auto;gap:24px}
.waiting-lesson{text-align:center;padding:38px 16px}
.waiting-lesson p{color:var(--muted);margin:0 0 22px}
.favorite-hint{font-size:12px;color:var(--muted);margin:14px 0 0;line-height:1.8}
.favorite-hint a{text-underline-offset:3px}
.favorite-hint span{display:block}
.vocab-actions .action-end{flex-wrap:wrap;justify-content:flex-end}
.catalog-row.pending{color:#928e87}
@media(max-width:700px){.vocab-actions{gap:12px}.vocab-actions .action-end{gap:8px}.vocab-actions button{padding:8px 12px}}


.category-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:8px 14px;border:1px solid #c9b4bd;border-radius:7px;background:#fffdfd;color:#65545c;font-family:"Noto Serif SC","Songti SC","STSong",serif;font-size:15px;font-weight:600;box-shadow:0 2px 3px #6f49550b;text-align:center}
.category-button::after{content:'▾';font:10px var(--sans);color:#957783}
.category-button:hover{background:#f9f1f4;border-color:#a87c8d}
.category-button[aria-expanded="true"]{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 2px 4px #6f495526}
.category-button[aria-expanded="true"]::after{content:'▴';color:#fff}
.category-count{display:inline-grid;place-items:center;min-width:20px;height:20px;margin:0;padding:0 4px;border-radius:10px;background:#f2e9ed;color:#816773;font:11px/1 var(--sans)}
.category-button[aria-expanded="true"] .category-count{background:#ffffff26;color:#fff}


.review-modes{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin:0 0 12px}
.review-modes button{border:1px solid #b99ba5;border-radius:5px;padding:7px 12px;min-height:38px;background:var(--paper);color:var(--accent);font:600 14px/1.5 var(--serif);letter-spacing:.025em;transition:background-color .16s,border-color .16s,color .16s}
.review-modes button:hover:not([aria-pressed="true"]){background:#f7eef1;border-color:var(--accent)}
.review-modes button[aria-pressed="true"]{background:#e6ccd5;border-color:var(--accent);color:#714554;box-shadow:inset 0 0 0 1px #8e5d6c18}
.review-covered{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.review-mask{margin:4px 0;color:#8d817f;font:12px/1.8 var(--sans)}
.review-peek{padding:3px 0;border:0;background:none;color:var(--accent);font:12px/1.7 var(--sans);text-decoration:underline;text-underline-offset:4px}
.review-reference{width:100%}
.review-reference[hidden]{display:none}



.lesson-bar{border:1px solid #c8adb7;border-radius:8px;background:#f4edef;padding:10px 14px}
.vocab-toolbar{display:flex;justify-content:flex-end;margin-bottom:8px}
.vocab-toolbar button{font-size:12px;padding:6px 12px}
.vocab-table th{width:43%;font:normal 19px/1.6 "Times New Roman","Noto Serif SC","Songti SC","STSong",serif;color:var(--ink)}
.vocab-table .vocab-english-cell{padding:10px 8px}
.vocab-reveal{display:flex;align-items:center;width:100%;min-height:50px;padding:8px 10px;border:1px dashed #cbb9c1;border-radius:5px;background:#f4edef;color:#8e5d6c;font:12px/1.7 var(--sans);text-align:left}
.vocab-reveal.is-revealed{background:transparent;border-color:transparent;color:var(--ink);font:normal 19px/1.6 "Times New Roman","Noto Serif SC","Songti SC","STSong",serif}
.vocab-reveal:hover{border-color:#b69aa3}
@media(max-width:700px){
 .lesson-bar{padding:9px 10px}
 .review-modes{display:flex}
 .review-modes button{padding:7px 10px}
 .vocab-table th{width:42%;font-size:17px}
 .vocab-reveal{padding:8px 6px}
 .vocab-reveal.is-revealed{font-size:17px}
}


.lesson-bar{display:grid;grid-template-columns:60px minmax(0,1fr) 60px;gap:8px}
.lesson-bar #catalog-categories{grid-column:2;justify-content:center;gap:20px}
.lesson-bar #completion{grid-column:3;justify-self:end}
@media(max-width:700px){
 .lesson-bar{grid-template-columns:minmax(0,1fr);gap:7px}
 .lesson-bar #catalog-categories{grid-column:1;order:0;display:grid;grid-template-columns:.75fr 1.15fr 1.15fr;gap:9px;width:100%}
 .lesson-bar #completion{grid-column:1;justify-self:end;margin:0}
 .category-button{min-width:0;min-height:46px;padding:6px 5px;gap:4px;font-size:12px;line-height:1.45;white-space:normal}
 .category-button::after{display:none}
 .category-label{min-width:0;word-break:keep-all}
 .category-count{min-width:16px;height:16px;padding:0 3px;font-size:10px;flex-shrink:0}
}


.review-page .workspace.reading-mode{row-gap:0}
.review-page .chart-rail{position:static;display:flex;flex-direction:column;align-items:center;gap:16px;padding:8px 0 20px;background:var(--canvas)}
.review-page .chart-card{margin:0 auto}
.review-page .review-modes{position:static;margin:0;padding:0;flex-shrink:0}
@media(min-width:701px){
 .review-col-step{width:10%}.review-col-template{width:30%}.review-col-sample{width:38%}.review-col-chinese{width:22%}
 .review-page .review-table{border-collapse:separate;border-spacing:0;border-top:1px solid var(--line);border-left:1px solid var(--line)}
 .review-page .review-table th,.review-page .review-table td{border-width:0 1px 1px 0;padding:8px 10px}
 .review-page .review-table thead th{text-align:center;line-height:1.35;padding:6px 10px}
}
@media(min-width:701px) and (min-height:600px){
 .review-page .chart-card{position:static;max-width:460px;padding:8px 18px;background:#fff;box-shadow:0 3px 12px #24232108}
 .review-page #chart{max-width:220px;margin-top:3px}
 .review-page .chart-card h2{font-size:13px;padding:2px 6px;margin-top:2px}
 .review-page .review-table{margin-top:0}
 .review-page .review-table thead th{position:static;box-shadow:0 1px var(--line)}
}
.review-chart-link{display:none}
@media(max-width:700px),(max-height:599px){
 .review-chart-link{display:inline-flex;align-items:center;min-height:34px;padding:4px 10px;border:1px solid var(--line);border-radius:4px;background:var(--paper);color:var(--accent);font:12px/1.6 var(--sans)}
}

.chart-rail{width:100%;min-width:0}
.chart-rail:has(>.chart-card[hidden]){display:none}

.vocab-reveal span{min-width:0;overflow-wrap:anywhere}


main>.pack-header,main>.lesson-bar,main>#catalog-panel,main>.steps{width:100%;max-width:760px;margin-left:auto;margin-right:auto}

#chart.multi-chart{max-width:100%;display:grid;grid-template-columns:minmax(0,1fr);gap:14px}
#chart.paired-charts{grid-template-columns:repeat(2,minmax(0,1fr));align-items:center}
.chart-panel{min-width:0;text-align:center}
#chart.multi-chart svg{width:100%;height:auto;max-height:300px}
.chart-caption{display:block;margin-top:6px;font:12px/1.5 var(--sans);color:var(--muted)}
.handout-time{color:#96722d}
.review-page #chart.multi-chart{max-width:100%}
.review-page #chart.multi-chart svg{max-height:180px}
.review-page .chart-caption{font-size:10px}
@media(max-width:700px){
 #chart.paired-charts{grid-template-columns:1fr;gap:16px}
 #chart.multi-chart svg{max-height:210px}
 .workspace:has(.paired-charts):not(.reading-mode){position:static;height:auto;grid-template-rows:auto auto auto}
 .workspace:has(.paired-charts):not(.reading-mode)>.activity{height:auto;max-height:none;overflow:visible;width:100%;max-width:var(--lesson-content-width);left:0;scrollbar-gutter:auto}
 .review-page #chart.multi-chart svg{max-height:220px}
}


@media(max-width:700px){.hinted-word.letter-spelling{font-size:min(18px,calc((100vw - 94px) / var(--spelling-em,1)))}}


#completion.is-complete,.catalog-row .status.is-complete{color:#42734b;font-weight:600}


.lesson-bar{grid-template-columns:84px minmax(0,1fr) 84px}
.lesson-status{grid-column:3;justify-self:end;display:flex;align-items:center;gap:8px}
.random-trigger{position:relative;display:inline-flex}
#random-practice{display:grid;place-items:center;width:30px;height:30px;padding:0;border:1px solid #c8adb7;border-radius:6px;background:var(--paper);color:var(--accent);transition:background .18s,border-color .18s}
#random-practice:hover:not(:disabled){background:var(--accent-soft);border-color:var(--accent)}
#random-hint{position:absolute;z-index:12;bottom:calc(100% + 9px);right:0;width:max-content;max-width:240px;padding:6px 10px;border:1px solid #dbcbd0;border-radius:5px;background:var(--paper);color:var(--ink);font:12px/1.6 var(--sans);box-shadow:0 3px 12px #3d263018;pointer-events:none;visibility:hidden;opacity:0;transition:opacity .15s}
.random-trigger:hover #random-hint,.random-trigger:focus-within #random-hint{visibility:visible;opacity:1}
#random-exit{grid-column:2;justify-self:center;width:100%;max-width:520px;display:flex;align-items:center;justify-content:space-between;gap:16px;height:33.1px;color:var(--accent);font:14px/16px var(--serif)}
#random-exit a{font-size:12px;line-height:16px;text-decoration:underline;text-underline-offset:3px}
#catalog-categories[hidden],#random-exit[hidden]{display:none}
@media(max-width:700px){.lesson-bar{grid-template-columns:minmax(0,1fr)}.lesson-status{grid-column:1}.lesson-status #completion{grid-column:auto}#random-exit{grid-column:1}}
@media(prefers-reduced-motion:reduce){#random-practice,#random-hint{transition:none}}


.review-table [data-review-cell] { cursor:pointer; }
.review-table [data-review-cell]:focus-visible { outline:2px solid var(--accent); outline-offset:-3px; }


.lesson-directory{width:100%;max-width:880px;margin:0 auto 18px;border:1px solid #c8adb7;border-radius:8px;background:#f4edef}
.lesson-directory .lesson-bar{width:100%;max-width:none;margin:0;padding:10px 12px;border:0;border-radius:8px;background:transparent}
.lesson-directory #catalog-panel{margin:0;padding:0;border:0;border-radius:0 0 8px 8px;overflow:hidden;background:var(--paper);overflow-anchor:none}
.catalog-drawer-inner{padding:12px 18px 16px;border-top:1px solid #dfcfd5}
#completion[hidden]{display:none}
@media(max-width:700px){.lesson-directory .lesson-bar{padding:9px 10px}.catalog-drawer-inner{padding:10px}}


.writing-reveal{opacity:0;visibility:hidden;transition:opacity .38s ease,visibility 0s .38s}
.writing-reveal.is-ready{opacity:1;visibility:visible;transition:opacity .38s ease,visibility 0s}


.review-table tbody th,.review-table tbody td{transition:background-color .12s ease}
.review-table tr.selected>th,.review-table tr.selected>td{border-color:var(--line);box-shadow:none}
.review-table tr.selected{border-color:var(--line)}
.review-table td:has(.review-cell-peek){position:relative}
.review-cell-peek{position:absolute;inset:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;padding:12px;text-align:center}
@media(max-width:700px){.review-table td:has(.review-cell-peek){min-height:72px}}


.region-outline{opacity:0;transition:opacity .14s ease;filter:drop-shadow(0 0 5px rgba(139,102,132,.42))}
.chart-region.is-focused .region-outline{opacity:1}
.region-outline>*{animation-play-state:paused}
.chart-region.is-focused .region-outline>*{animation-play-state:running}
.chart-line path.chart-hit{fill:none;stroke:transparent;stroke-width:26;pointer-events:stroke}
.chart-line path.label-outline,.chart-line path.outline-halo{stroke-linecap:round;stroke-linejoin:round}
.outline-edge{stroke-width:5.8}
.label-outline{stroke-width:4.8}
.outline-underlay{stroke-width:11}
.outline-halo{stroke-width:9}
.chart-intro{opacity:0;animation:none;transition:opacity .14s ease;stroke-width:4.5}
.chart-intro.is-focused{opacity:1;animation:chart-entry-breathe 3.2s ease-in-out 3}
.chart-card h2,.review-page .chart-card h2{position:relative;border-width:2px;padding-left:30px;padding-right:30px}
.chart-card h2:before{content:'→';position:absolute;left:7px;top:50%;transform:translateY(-50%);font:700 20px/1 var(--serif);color:var(--chart-focus);opacity:0;transition:opacity .14s ease}
.chart-card h2.highlight:before{opacity:1}
@keyframes chart-halo-breathe{0%,100%{stroke-width:9;opacity:.20}50%{stroke-width:25;opacity:.36}}
@keyframes chart-title-breathe{0%,100%{box-shadow:0 0 0 2px rgba(139,102,132,.16),0 2px 8px rgba(139,102,132,.22)}50%{box-shadow:0 0 0 6px rgba(139,102,132,.20),0 3px 17px rgba(139,102,132,.38)}}
@media(prefers-reduced-motion:reduce){.writing-reveal,.review-table tbody th,.review-table tbody td,.region-outline,.chart-intro{transition:none}.chart-intro.is-focused,.chart-card h2.highlight{animation:none}.outline-halo{stroke-width:13;opacity:.25}}


.writing-reveal.is-restored{transition:none}


.review-hint-trigger{position:relative;display:inline-flex}
.review-tooltip{position:absolute;z-index:12;bottom:calc(100% + 9px);left:0;width:260px;max-width:calc(100vw - 48px);padding:6px 10px;border:1px solid #dbcbd0;border-radius:5px;background:var(--paper);color:var(--ink);font:12px/1.6 var(--sans);box-shadow:0 3px 12px #3d263018;pointer-events:none;visibility:hidden;opacity:0;transition:opacity .15s;text-align:left}
.review-hint-trigger:hover>.review-tooltip,.review-hint-trigger:focus-within>.review-tooltip{visibility:visible;opacity:1}
@media(prefers-reduced-motion:reduce){.review-tooltip{transition:none}}


.keyboard-hint{margin:7px 0 0;color:#8b847d;font:12px/1.6 var(--sans);text-align:right}.keyboard-hint>span{white-space:nowrap}.keyboard-hint kbd{font:inherit;color:inherit}



.review-table .sample-cell:has(.review-english-prompt){vertical-align:middle}
.review-english-prompt{width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:10px 0;text-align:center}
.review-handwriting-guide{margin:0;max-width:30em;color:#91857e;font:11px/1.7 var(--sans)}
.review-peek-hint>.review-tooltip{left:50%;transform:translateX(-50%)}
@media(max-width:700px){.review-modes button{min-height:38px;padding:7px 6px}}


.review-page #source-button{display:none}


.vocab-study{max-width:560px;margin:0 auto 32px}
.word-card-face{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;width:100%;border:1px solid #ddcdd3;border-radius:12px;background:var(--paper);color:var(--ink);text-align:center;padding:30px 24px;box-shadow:0 4px 15px #59414b06}
.study-card{min-height:230px;background:linear-gradient(135deg,var(--paper),#f5eff1)}
.word-card-text{font:normal 24px/1.65 "Times New Roman","Noto Serif SC","Songti SC",serif;overflow-wrap:anywhere;max-width:100%}
.study-card .word-card-text{font-size:30px}
.word-card-side,.word-card-hint,.word-card-number{font:11px/1.5 var(--sans);color:#928a83}
.vocab-study-controls{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-top:14px}
.vocab-study-controls>span{font:12px var(--sans);color:var(--muted)}
.vocab-study-controls button{padding:7px 14px;font-size:12px}
.vocab-list-heading{display:flex;align-items:center;gap:16px;color:var(--muted);font:12px var(--sans);margin:0 0 16px;text-align:center}
.vocab-list-heading::before,.vocab-list-heading::after{content:"";flex:1;border-top:1px solid var(--line)}
.vocab-card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.vocab-mini-card{position:relative;min-width:0}
.vocab-mini-card .word-card-face{min-height:170px;height:100%;padding:36px 26px 20px;gap:14px;background:var(--paper);border:1px solid #ddcdd3;text-align:center;color:var(--ink)}
.vocab-mini-card .word-card-text{font-size:21px}
.vocab-mini-card .word-card-number{position:absolute;top:12px;left:16px}
.vocab-mini-card>.vocab-favorite{position:absolute;top:5px;right:8px;margin:0}
.word-card-face.is-revealed,.study-card.is-flipped{background:var(--paper)}
@media(max-width:700px){.vocab-card-grid{grid-template-columns:1fr}.study-card{min-height:215px}.study-card .word-card-text{font-size:26px}.vocab-mini-card .word-card-face{min-height:145px}.vocab-study{margin-bottom:26px}}


.vocab-card-grid{grid-template-columns:minmax(0,1fr)}
.word-card-face,.vocab-mini-card .word-card-face{display:block;padding:0;border:0;background:transparent;box-shadow:none;perspective:1000px;height:auto}
.word-card-inner{display:grid;position:relative;width:100%;min-height:inherit}
.word-card-face.is-flipped>.word-card-inner{animation:vocab-face-in .3s ease both}
.word-card-face.is-returning>.word-card-inner{animation:vocab-face-return .35s ease both}
@keyframes vocab-face-in{from{opacity:0;transform:perspective(600px) rotateY(90deg)}to{opacity:1;transform:perspective(600px) rotateY(0)}}
@keyframes vocab-face-return{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.word-card-face:not(.is-flipped) .card-back,.word-card-face.is-flipped .card-front{visibility:hidden;pointer-events:none}
.word-card-panel{grid-area:1/1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;min-width:0;padding:30px 24px;border:1px solid #ddcdd3;border-radius:12px;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--paper);box-shadow:0 4px 15px #59414b06}
.study-card .card-front{background:linear-gradient(135deg,var(--paper),#f5eff1)}
.word-card-panel.card-back{background:var(--paper)}
.word-card-face.is-revealed,.study-card.is-flipped{background:transparent}
.vocab-mini-card .word-card-panel{padding:36px 26px 20px;gap:14px}
.study-progress{text-align:center;color:var(--muted);font:12px/1.5 var(--sans);margin-top:12px}
.vocab-study-controls{gap:0;margin-top:10px}
.study-control-spacer,.study-undo-slot{width:56px;flex-shrink:0}.study-undo-slot{display:flex;justify-content:flex-end}
.study-decisions{flex:1;display:flex;justify-content:center;gap:26px}
.vocab-study-controls .study-decisions button{flex:1;max-width:160px;min-width:0;height:44px;border-radius:22px;font:700 22px/1 var(--sans);display:flex;align-items:center;justify-content:center;padding:0}
.study-missed{background:rgba(232,115,74,.1);border:1px solid rgba(232,115,74,.3);color:#e8734a}.study-missed>span{transform:translateY(-2px)}
.study-known{background:#42734b12;border:1px solid #42734b30;color:#42734b}.study-known>span{transform:translateY(-1px)}
.vocab-study-controls .study-undo{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;padding:0;background:transparent;border:1px solid var(--line);color:var(--muted)}
.study-complete{min-height:230px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;border:1px solid #ddcdd3;border-radius:12px;background:var(--paper)}
@media(prefers-reduced-motion:reduce){.word-card-face.is-flipped>.word-card-inner,.word-card-face.is-returning>.word-card-inner{animation:none}}


.vocab-card-grid,.vocab-toolbar{width:100%;max-width:468px;margin-left:auto;margin-right:auto}
.vocab-card-grid{gap:12px}
.vocab-mini-card .word-card-face{min-height:140px}
.vocab-mini-card .word-card-panel{position:relative;padding:28px 38px 20px;gap:5px}
.vocab-mini-card .word-card-text{font-size:22px;line-height:1.4}
.vocab-mini-card .word-card-hint{font-size:10px}
.word-card-flip-target{position:absolute;inset:0;width:100%;height:100%;padding:0;border:0;border-radius:12px;background:transparent;z-index:1}
.word-card-flip-target:hover{background:transparent}
.word-card-panel>.vocab-favorite{position:absolute;top:5px;right:8px;margin:0;z-index:2;font-size:20px}
.study-slide-viewport{overflow:hidden;border-radius:12px}
.study-slide.slide-next{animation:vocab-slide-next .28s ease-in both}
.study-slide.slide-prev{animation:vocab-slide-prev .28s ease-in both}
@keyframes vocab-slide-next{to{transform:translateX(-110%);opacity:0}}
@keyframes vocab-slide-prev{to{transform:translateX(110%);opacity:0}}
@media(prefers-reduced-motion:reduce){.study-slide.slide-next,.study-slide.slide-prev{animation:none}}

.word-card-pos{color:var(--muted);font:italic 13px/1.4 "Times New Roman",serif}
.study-card .word-card-pos{margin-top:-10px}


.review-english-covered{min-height:80px}
.review-cell-peek.review-english-peek{display:flex;position:absolute;text-decoration:none}
.review-english-peek .review-peek-label{text-decoration:underline;text-underline-offset:4px}
.review-english-peek .review-english-prompt{padding:0}


.review-english-peek>.review-tooltip{left:auto;right:0;top:auto;bottom:calc(50% - 6px);transform:none;width:calc(50% - 56px);max-width:168px;padding:5px 8px;font-size:11px;line-height:1.55;text-wrap:balance}
@media(max-width:1000px){
 .review-english-covered{min-height:140px}
 .review-english-peek .review-english-prompt{transform:translateY(-26px)}
 .review-english-peek>.review-tooltip{left:auto;right:12px;bottom:10px;transform:none;width:240px;max-width:calc(100% - 24px)}
}


#source .source-image{position:relative;container-type:inline-size;overflow:hidden}
#source .source-watermark{position:absolute;transform:translate(-50%,-50%) rotate(-32deg);color:rgba(75,65,70,.11);font:500 clamp(11px,3.8cqw,31px)/1.2 var(--sans);white-space:nowrap;pointer-events:none;user-select:none}


main:not(.reading-page){max-width:960px}
.workspace:not(.reading-mode){position:static;height:auto;max-height:none;grid-template-rows:auto auto auto;gap:20px}
.workspace:not(.reading-mode) .chart-card{max-width:820px}
.workspace:not(.reading-mode) #chart{max-width:650px}
.workspace:not(.reading-mode) #chart.paired-charts{max-width:100%}
.workspace:not(.reading-mode) #chart.multi-chart svg{max-height:420px}
.workspace:not(.reading-mode)>.activity{width:100%;max-width:820px;left:0;height:auto;max-height:none;overflow:visible;overscroll-behavior:auto;scrollbar-gutter:auto;padding:0 0 6px}
.workspace:not(.reading-mode)>footer{max-width:820px}
.workspace:not(.reading-mode) .activity h2{text-align:center}
.workspace:not(.reading-mode) .question-label{text-align:center;font:500 19px/1.6 var(--serif);margin:8px 0 12px}
.category-button.is-current{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 2px 4px #6f495526}
.category-button.is-current::after{color:#fff}
.category-button.is-current .category-count{background:#ffffff26;color:#fff}
.pack-brand{font-size:14px;letter-spacing:1px;margin-bottom:10px}
.pack-header h1{font-size:clamp(21px,3.4vw,28px);line-height:1.45}
#chart-title[hidden]{display:none}
@media(max-width:700px){
 .workspace:not(.reading-mode){gap:18px}
 .workspace:not(.reading-mode) #chart.multi-chart svg{max-height:340px}
 .workspace:not(.reading-mode) .question-label{font-size:18px}
 .pack-brand{font-size:12px;letter-spacing:0}
}


.review-table tbody th,.review-table .review-step{font-size:14px;line-height:1.75}
.review-table .template-text,.review-table .sample-line{font-size:18px;line-height:33.25px}
.review-table .translation-line{font-size:15px;line-height:1.75}
.review-table td:before{font-size:14px;line-height:1.75}
.review-table .review-peek{font-size:14px;line-height:1.75}
@media(max-width:700px){
 .review-page .chart-rail{gap:12px;padding:6px 0 16px;background:var(--canvas)}
 .review-page .chart-card{position:static;max-width:460px;padding:8px 12px;background:#fff}
 .review-page .chart-card h2{font-size:13px;line-height:1.5;margin-top:3px;padding-top:2px;padding-bottom:2px}
 .review-page #chart svg,.review-page #chart.multi-chart svg{height:auto;max-height:min(220px,28svh)}
 .review-page #chart.paired-charts{gap:6px}
 .review-page #chart.paired-charts svg{max-height:min(140px,16svh)}
 .review-page .chart-caption{margin-top:2px}
 .review-page .review-table tbody th,.review-page .review-step{font-size:15px}
}


@media(max-width:700px) and (max-height:700px){
 .review-page #chart.paired-charts{grid-template-columns:repeat(2,minmax(0,1fr));align-items:center;gap:8px}
 .review-page #chart.paired-charts svg{max-height:min(150px,22svh)}
}


@media(min-width:701px){
 .workspace:not(.reading-mode) #chart svg,
 .workspace:not(.reading-mode) #chart.multi-chart svg{max-height:300px}
 .workspace:not(.reading-mode) #chart.paired-charts svg{max-height:390px}
 .review-page .chart-card{max-width:690px;padding:8px 18px}
 .review-page #chart,.review-page #chart.multi-chart{max-width:545px;margin-top:4px}
 .review-page #chart.paired-charts{max-width:100%}
 .review-page #chart svg,.review-page #chart.multi-chart svg{height:auto;max-height:min(255px,29svh)}
 .review-page #chart.paired-charts svg{max-height:min(290px,29svh)}
 .review-page .chart-caption{font-size:12px;margin-top:4px}
 .review-page .chart-card h2{font-size:16px;line-height:1.5;margin:3px auto 0;padding-top:3px;padding-bottom:3px}
}


main,main.reading-page{padding-bottom:80px}
.workspace>footer,.reading-mode>footer{margin-top:48px}
@media(max-width:700px){
 #random-exit{max-width:280px}
 main,main.reading-page{padding-bottom:64px}
 .workspace>footer,.reading-mode>footer{margin-top:32px}
}


.judgment-feedback .option{position:relative;padding-left:58px;padding-right:58px;transition:background-color .16s,border-color .16s}
.judgment-feedback .option.correct,.judgment-feedback .option.correct:hover{border-color:#498561;background:#edf5ef;box-shadow:inset 0 0 0 1px #498561}
.judgment-feedback .option.wrong,.judgment-feedback .option.wrong:hover{border-color:#b5656c;background:#fbefef;box-shadow:inset 0 0 0 1px #b5656c}
.judgment-result-mark{position:absolute;right:18px;top:calc(50% - 17px);width:34px;height:34px;border-radius:50%;display:grid;place-items:center;animation:judgment-mark-in .26s ease-out both;pointer-events:none}
.correct .judgment-result-mark{color:#287547;background:#dceee1}
.wrong .judgment-result-mark{color:#b34755;background:#f4dce0}
.judgment-result-mark svg{width:23px;height:23px}
@keyframes judgment-mark-in{from{opacity:0;transform:scale(.65)}70%{opacity:1;transform:scale(1.1)}to{opacity:1;transform:scale(1)}}
@media(max-width:700px){.judgment-feedback .option{padding-left:40px;padding-right:40px}.judgment-result-mark{right:8px;width:28px;height:28px;top:calc(50% - 14px)}.judgment-result-mark svg{width:20px;height:20px}}
@media(prefers-reduced-motion:reduce){.judgment-result-mark{animation:none}.judgment-feedback .option{transition:none}}

.letter-spelling .initial-letter.given-prefix{text-align:left;letter-spacing:.3em;text-indent:.15em}


body[data-lesson] .hinted-word.letter-spelling{font:inherit;--letter-width:.49em;padding:0 3px 2px;margin:2px 2px}
body[data-lesson] .letter-spelling .initial-letter{width:auto;height:1.45em;line-height:1.45em;text-align:left;letter-spacing:normal;text-indent:0;background:none}
body[data-lesson] .hinted-word.letter-spelling .inline-spelling{height:1.45em;line-height:1.45em;letter-spacing:.035em;padding:0;text-indent:0;background:none}


body[data-lesson] .letter-spelling{font-kerning:none;font-variant-ligatures:none;letter-spacing:.035em}
body[data-lesson] .letter-spelling .initial-letter{letter-spacing:.035em}
body[data-lesson] .serif-letter-slot{display:inline-block;position:relative;width:.58em;height:1.45em;line-height:1.45em;text-align:center;letter-spacing:0}
body[data-lesson] .serif-letter-slot::after{content:"";position:absolute;left:.06em;right:.06em;bottom:0;border-bottom:1px solid var(--letter-line)}
body[data-lesson] .serif-input-wrap{display:inline-grid;grid-template-columns:minmax(0,1fr);width:calc(var(--slots) * .58em + .12em);align-items:baseline;vertical-align:baseline}
body[data-lesson] .serif-input-guide{grid-area:1 / 1;display:inline-block;white-space:nowrap;padding-right:.12em;line-height:1.45em;pointer-events:none}

body[data-lesson] .hinted-word.letter-spelling .serif-letter-input{grid-area:1 / 1;align-self:baseline;width:100%;min-width:0;box-sizing:border-box;background:none;padding:0 .12em 0 0;font-family:"Courier New",monospace;letter-spacing:calc(.58em - 1ch);color:transparent;caret-color:#49433f;font-kerning:none;font-variant-ligatures:none}
body[data-lesson] .serif-letter-input::selection{color:transparent;background:#8e5d6c30}