:root{
  --bg:#EAF2F5; --card:#FFFFFF; --ink:#1E2B33; --muted:#5A6E78;
  --jade:#1F8A70; --jade-ink:#FFFFFF; --mark:#F7C548; --mark-ink:#1E2B33; --line:#D3E1E7; --now:#F3F8FA; --mine:#E2F3EC;
  --scene-dim:1;
  --ui:"Baloo 2","Segoe UI",system-ui,sans-serif;
  --py:"Noto Sans","Segoe UI",Arial,sans-serif;
  --han:"Kaiti SC","STKaiti","KaiTi","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#11181C; --card:#1A242A; --ink:#E5EEF2; --muted:#9AB0BA;
  --jade:#4CC3A0; --jade-ink:#0E1A16; --mark:#F2C04A; --mark-ink:#1A1A1A; --line:#2A3940; --now:#202D34; --mine:#1D3A33;
  --scene-dim:.88; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#11181C; --card:#1A242A; --ink:#E5EEF2; --muted:#9AB0BA;
  --jade:#4CC3A0; --jade-ink:#0E1A16; --mark:#F2C04A; --mark-ink:#1A1A1A; --line:#2A3940; --now:#202D34; --mine:#1D3A33;
  --scene-dim:.88; color-scheme:dark}

*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--ui);font-size:16px;line-height:1.5}
[hidden]{display:none!important}
.wrap{max-width:860px;margin:0 auto;padding:20px 16px 40px;display:grid;gap:16px}
header{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:8px 16px}
h1{margin:0;font-family:var(--han);font-size:clamp(28px,5vw,38px);font-weight:600}
h1 small{font-family:var(--ui);font-size:16px;font-weight:500;color:var(--muted);margin-left:8px}
.back{font-weight:600;color:var(--jade);text-decoration:none;font-size:15px}
.lede{margin:0;font-size:17px;max-width:62ch}
.tags{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.tag{font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--jade);font-weight:700}
.level-chip{display:inline-block;justify-self:start;font-size:12.5px;font-weight:700;border-radius:999px;padding:1px 10px;color:#fff;letter-spacing:0;text-transform:none}
.level-chip.lv-k2{background:#C8601C}
.level-chip.lv-p2{background:#2471A3}
.level-chip.lv-p4{background:#7D3C98}

/* conversation list: one tab per topic (CVProgress.tabs), a level chip on every card */
.shelf h2{margin:8px 0 10px;font-size:18px}
.shelf h2 small{color:var(--muted);font-weight:500;margin-left:6px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.conv-card{display:grid;align-content:start;background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;color:inherit;text-decoration:none}
.conv-card:hover{border-color:var(--jade)}
.conv-card:focus-visible{outline:3px solid var(--jade);outline-offset:3px}
.conv-card svg,.conv-card img{display:block;width:100%;height:auto;aspect-ratio:800/300;filter:brightness(var(--scene-dim))}
.card-body{padding:10px 14px 14px;display:grid;gap:2px}
.card-title{font-family:var(--han);font-size:24px;line-height:1.3}
.card-en{color:var(--muted)}
.card-meta{font-size:13px;color:var(--jade);font-weight:700}
.card-badge{display:inline-block;justify-self:start;margin-top:6px;font-size:12.5px;font-weight:700;color:var(--jade);background:var(--now);border-radius:999px;padding:2px 10px}
.conv-card.is-done{border:2px solid var(--jade)}
.conv-card.is-done .card-badge{background:var(--jade);color:var(--jade-ink)}
.tier-count{margin-left:10px;font-size:14px;color:var(--jade);font-weight:700}
.tier-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:4px 0 2px}
.tier-tab{font:inherit;cursor:pointer;display:grid;justify-items:center;padding:8px 14px;border-radius:14px;border:2px solid var(--jade);background:transparent;color:var(--jade);font-weight:700;font-size:17px;line-height:1.25;flex:1 1 140px}
.tier-tab small{font-size:12.5px;font-weight:500;opacity:.85}
.tier-tab .tab-count{font-size:12px;font-weight:700}
.tier-tab .tab-count:empty{display:none}
.tier-tab[aria-selected="true"]{background:var(--jade);color:var(--jade-ink)}
.tier-tab:focus-visible{outline:3px solid var(--jade);outline-offset:3px}
.tabbed .tier-head{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.progress-summary{margin:0;display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;font-weight:600}
.link-btn{font:inherit;font-size:14px;font-weight:500;background:none;border:0;color:var(--muted);text-decoration:underline;cursor:pointer;padding:0}
.best-score{margin:0;font-weight:700;color:var(--jade)}

/* the place, with the people talking standing in front of it */
.stage{position:relative;background:var(--card);border-radius:18px;overflow:hidden;border:1px solid var(--line)}
.stage svg.bg{display:block;width:100%;height:auto;filter:brightness(var(--scene-dim))}
.cast{position:absolute;left:0;right:0;bottom:4px;display:flex;justify-content:space-evenly;align-items:flex-end;pointer-events:none}
.member{display:grid;justify-items:center;gap:2px}
.member .av{width:clamp(58px,14vw,104px)}
.member .tagname{background:var(--card);color:var(--ink);border-radius:999px;padding:0 10px;font-size:13px;font-weight:700;white-space:nowrap}
.member.talking .av{animation:cvbob .3s ease-in-out infinite alternate}
.member.mine .tagname{background:var(--jade);color:var(--jade-ink)}
@keyframes cvbob{to{transform:translateY(-7px)}}
.av{display:block;border-radius:50%;overflow:hidden;aspect-ratio:1;height:auto}
.hint{font-size:14px;color:var(--muted);margin:0}

/* the dialogue as chat bubbles: the learner's part on the right */
.talk{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;display:grid;gap:14px}
.modes{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.modes .label{font-weight:700;color:var(--muted);font-size:14px}
.chat{display:grid;gap:12px}
.bubble{display:flex;gap:10px;align-items:flex-start;max-width:min(660px,96%)}
.bubble.right{flex-direction:row-reverse;justify-self:end}
.bubble > .av{width:44px;flex:none;margin-top:4px}
.bub-body{background:var(--now);border:2px solid var(--line);border-radius:18px;padding:4px 14px 8px;display:grid;min-width:0}
.bubble.left .bub-body{border-top-left-radius:6px}
.bubble.right .bub-body{border-top-right-radius:6px;background:var(--mine)}
.bubble.now .bub-body{border-color:var(--jade);box-shadow:0 0 0 2px var(--jade)}
.bub-who{font-size:13px;font-weight:700;color:var(--muted);display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.bubble.right .bub-who{justify-content:flex-end}
.say{font:inherit;font-size:13px;font-weight:700;border:0;background:none;color:var(--jade);cursor:pointer;padding:0 4px;border-radius:6px}
.say:focus-visible{outline:2px solid var(--jade)}
.zh{font-family:var(--han);font-size:clamp(22px,4.6vw,30px);line-height:2.05;margin:0}
.word{font:inherit;color:inherit;background:none;border:0;padding:0 .03em;margin:0;border-radius:8px;cursor:pointer;border-bottom:3px solid transparent}
.word:hover{border-bottom-color:var(--line)}
.word.active,.word.reading{background:var(--mark);color:var(--mark-ink)}
.word:focus-visible,.ctl:focus-visible{outline:3px solid var(--jade);outline-offset:3px}
rt{font-family:var(--py);font-size:.36em;color:var(--muted)}
.word.active rt,.word.reading rt{color:var(--mark-ink)}
.nopy rt{visibility:hidden}
.punct{color:var(--muted)}
.wgroup{white-space:nowrap}
.en{margin:0 0 4px;font-size:16px;color:var(--muted);display:none}
.show-en .en{display:block}
.turn{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:6px 0 2px;padding:8px 10px;border-radius:12px;background:var(--mark);color:var(--mark-ink);font-weight:700}
.turn .ctl{border-color:var(--mark-ink);color:var(--mark-ink);background:#fff}
.turn .ctl.primary{background:var(--mark-ink);color:#fff}
.hide-mine .bubble.mine:not(.revealed) .zh,.hide-mine .bubble.mine:not(.revealed) .en{filter:blur(8px);user-select:none}
.peek{display:none}
.hide-mine .bubble.mine:not(.revealed) .peek{display:inline}
.done-note{margin:0;font-weight:700;color:var(--jade);font-size:18px}

.controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.ctl{font:inherit;font-weight:600;font-size:15px;border-radius:999px;padding:8px 16px;cursor:pointer;border:2px solid var(--jade);background:transparent;color:var(--jade);display:inline-flex;gap:6px;align-items:center;text-decoration:none}
.ctl.primary,.ctl[aria-pressed="true"]{background:var(--jade);color:var(--jade-ink)}
.ctl:disabled{opacity:.4;cursor:default}
.ctl small{font-size:12px;font-weight:500;opacity:.85}

.wordcard{position:fixed;left:50%;transform:translateX(-50%);bottom:12px;width:min(828px,calc(100% - 32px));z-index:5;display:flex;gap:16px;align-items:center;flex-wrap:wrap;background:var(--card);border:2px solid var(--line);border-radius:14px;padding:8px 16px;min-height:60px;box-shadow:0 4px 18px rgba(0,0,0,.10)}
.wc-han{font-family:var(--han);font-size:40px;line-height:1}
.wc-text{display:grid;min-width:0}
.wc-py{font-family:var(--py);font-size:20px;color:var(--jade);font-weight:700}
.wc-empty{color:var(--muted);margin:0}
.wc-close{margin-left:auto;font:inherit;font-size:20px;line-height:1;border:0;background:none;color:var(--muted);cursor:pointer;padding:4px 6px;border-radius:8px}
.note,.novoice{font-size:13px;color:var(--muted);margin:0}

/* useful sentences */
.phrases{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;display:grid;gap:10px}
.phrases h2,.next-steps h2{margin:0;font-size:20px}
.phrase{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;align-items:start;background:var(--now);border-radius:12px;padding:10px 12px}
.phrase .zh{font-size:clamp(20px,4vw,26px);line-height:1.6}
.phrase .p-note{grid-column:2;margin:0;font-size:15px}
.phrase .ctl{grid-row:span 2}
.next-steps{display:grid;gap:10px}

/* practice: the online quiz (same marking colours as the worksheet generator's online mode) */
.quiz{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;display:grid;gap:18px}
.quiz h2{margin:0;font-size:22px}
.quiz > p{margin:0;color:var(--muted)}
.qsec{display:grid;gap:10px}
.qsec h3{margin:0;font-size:17px;color:var(--jade)}
.qitem{background:var(--now);border-radius:12px;padding:12px 14px;display:grid;gap:8px}
.qitem .q{font-family:var(--han);font-size:clamp(20px,4.4vw,26px);line-height:2;margin:0}
.qitem .q-en{font-size:14px;color:var(--muted);margin:0}
.qrow{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.blank{display:inline-block;min-width:2.6em;border-bottom:3px solid currentColor;margin:0 .15em;vertical-align:baseline}
.mc-group{display:flex;flex-wrap:wrap;gap:8px}
.mc-btn{font-family:var(--han);font-size:21px;padding:6px 16px;border:2px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);cursor:pointer;min-width:60px;text-align:left}
.mc-btn:hover:not(:disabled){border-color:#3498db}
.mc-btn.mc-selected{border-color:#3498db;background:#d6eaf8;color:#1E2B33;font-weight:bold}
.mc-btn.mc-correct{border-color:#27ae60;background:#eafaf1;color:#1e8449;font-weight:bold}
.mc-btn.mc-wrong{border-color:#e74c3c;background:#fdedec;color:#922b21}
.mc-btn:disabled{cursor:default}
.mc-btn:focus-visible{outline:3px solid var(--jade);outline-offset:2px}
.ctl.hear{padding:6px 12px;font-size:14px;flex:none}
.score{font-size:20px;font-weight:700;color:var(--jade);margin:0}

/* practice: the printed worksheet */
#printSheet{display:none}
@media print{
  @page{size:A4;margin:14mm}
  body.has-sheet{background:#fff}
  body.has-sheet > .wrap,body.has-sheet > .site-head{display:none!important}
  body.has-sheet #printSheet{display:block!important}
}
.ws{color:#000;font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;font-size:12pt}
.ws-head{display:flex;justify-content:space-between;align-items:flex-end;gap:8mm;border-bottom:2px solid #000;padding-bottom:3mm;margin-bottom:4mm}
.ws-head h1{font-family:var(--han);font-size:22pt;margin:0;font-weight:600}
.ws-head h1 small{font-family:sans-serif;font-size:11pt;font-weight:400;margin-left:3mm;white-space:nowrap}
.ws-name{font-size:11pt;white-space:nowrap}
.ws h2{font-size:13pt;margin:5mm 0 3mm;border-left:4px solid #1F8A70;padding-left:3mm}
.ws-sec{break-inside:avoid}
.ws-script{display:grid;gap:1.5mm}
.ws-line{display:grid;grid-template-columns:18mm 1fr;gap:3mm;align-items:baseline}
.ws-line b{font-family:var(--han);font-size:13pt;text-align:right}
.ws-bank{border:1.5px dashed #000;padding:2mm 5mm;font-family:var(--han);font-size:17pt;display:flex;gap:9mm;flex-wrap:wrap;margin-bottom:3mm}
.ws ol{margin:0;padding-left:8mm}
.ws li{margin:0 0 3mm}
.ws-zh{font-family:var(--han);font-size:15pt;line-height:2}
.ws-zh rt{font-family:var(--py);font-size:7.5pt;color:#333}
.ws-zh ruby,.qitem .q ruby{padding:0 .1em}
.ws-gap{display:inline-block;width:24mm;border-bottom:1px solid #000;margin:0 1mm}
.ws-en{font-size:9.5pt;color:#444}
.ws-opts{font-family:var(--han);font-size:13pt;display:grid;gap:1mm;margin-top:1mm;line-height:2}
.ws-opts rt{font-family:var(--py);font-size:7pt;color:#333}
.mc-btn rt{font-size:.45em}
.ws-tz{display:flex;flex-wrap:wrap;gap:3mm 8mm}
.ws-tzw{display:flex;flex-direction:column;gap:1mm;break-inside:avoid}
.ws-tzw span{font-size:9pt;font-family:var(--py)}
.ws-tzw div{display:flex}
.ws-tzw svg{width:13mm;height:13mm;display:block}
.ws-key{break-before:page}
.ws-key li{font-family:var(--han);font-size:12.5pt}
.ws-foot{margin-top:5mm;font-size:9pt;color:#555}
@media (prefers-reduced-motion: reduce){*,*::before,*::after{animation:none!important;transition:none!important}}

.site-head{background:#1B2A4A;color:#fff;padding:12px 16px;display:flex;justify-content:space-between;align-items:center;gap:8px 16px;flex-wrap:wrap}
.site-head a{color:#C9A84C;text-decoration:none;font-size:14px}
.site-head .site-name{color:#fff;font-weight:700;font-size:17px}
.guide{display:grid;gap:6px;margin-top:8px}
.guide h2{font-size:22px;margin:18px 0 2px}
.guide p,.guide li{max-width:72ch;margin:0}
.guide ul{margin:0;padding-left:22px;display:grid;gap:4px}
.guide table{border-collapse:collapse;width:100%;max-width:72ch;font-size:15px}
.guide th,.guide td{border:1px solid var(--line);padding:6px 10px;text-align:left;vertical-align:top}
.fulltext{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:14px 20px}
.fulltext summary{cursor:pointer;font-weight:700;color:var(--jade)}
.fulltext .ft-line{margin:12px 0 0}
.fulltext .ft-zh{font-family:var(--han);font-size:22px;margin:0}
.fulltext .ft-py{font-family:var(--py);color:var(--muted);margin:0;font-size:14px}
.fulltext .ft-en{margin:0;font-size:15px}