@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600&family=DM+Sans:wght@400;500;600;700&family=Libre+Caslon+Display&display=swap');
:root{color-scheme:light;--ink:#233138;--muted:#626c70;--line:#dce0df;--green:#e6ed82;--paper:#fafbf8;--accent:#304a42}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 'DM Sans','Noto Sans SC',sans-serif}button,select,input{font:inherit}button,a,select,input{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #577665;outline-offset:4px}header{min-height:94px;padding:20px 38px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font:italic 42px/1 Georgia,serif;letter-spacing:-2px;text-decoration:none;color:var(--ink)}.brand span{display:inline-block;font:14px/1.5 'Noto Sans SC',sans-serif;letter-spacing:2px;margin-left:22px}.header-note{font-size:12px;letter-spacing:3px}.edition{font-size:13px;color:var(--muted)}.workspace{display:grid;grid-template-columns:260px minmax(380px,1fr) 290px;max-width:1700px;margin:auto;padding-bottom:114px}.library{padding:42px 25px;border-right:1px solid var(--line);display:flex;flex-direction:column}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:600;margin:0 0 16px}.library h2{font-size:25px;line-height:1.6;font-weight:500;margin:0 0 28px}nav{display:grid;gap:8px}.song{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;border:1px solid transparent;background:none;padding:16px 12px;color:var(--ink);border-radius:6px}.song:hover{background:#eef1e9}.song[aria-current=true]{background:var(--ink);color:white}.song-index{font-size:12px;opacity:.7;padding-top:4px}.song strong{display:block;font:20px/1.25 Georgia,serif}.song small{display:block;font-size:12px;opacity:.75;margin-top:8px}.library-bottom{margin-top:auto;padding:50px 12px 0;font-size:14px}.small-label{font-size:12px;letter-spacing:1px;color:var(--muted)}.library-bottom p{margin:10px 0}.mini-line{height:1px;background:var(--line);margin:24px 0}.muted{color:var(--muted)}main{padding:40px 42px}.lesson-heading{display:flex;align-items:flex-start;gap:16px;justify-content:space-between}.lesson-heading h1{font:clamp(36px,3.8vw,58px)/1.06 'Libre Caslon Display',Georgia,serif;letter-spacing:-1px;margin:0 0 16px}.lesson-heading p:last-child{margin:0;color:var(--muted);font-size:15px}.lesson-number{font:72px/1 'Libre Caslon Display',Georgia,serif;color:#c9cfbf}.toolbar{display:flex;align-items:center;gap:18px;border-bottom:1px solid var(--line);margin-top:34px;padding-bottom:12px;font-size:13px;flex-wrap:wrap}.tab-label{font-size:15px;font-weight:600;margin-right:auto}.toggle{display:flex;align-items:center;gap:5px}input{accent-color:var(--accent);width:15px;height:15px}select{background:transparent;border:1px solid #c5cdc6;color:var(--ink);border-radius:5px;padding:5px;max-width:100%;font-size:13px}.reading{padding:26px 25px 22px;background:#eef2e9;border:1px solid #d9e0d1;border-radius:9px;margin-top:24px}.reading-top{display:flex;justify-content:space-between;align-items:center;gap:14px}.play{border:0;padding:10px 16px;border-radius:5px;font-size:14px}.primary{background:var(--ink);color:#fff}#words{display:flex;flex-wrap:wrap;gap:5px;margin:30px 0 12px}.word{font:34px/1.3 'Libre Caslon Display',Georgia,serif;background:none;border:0;border-bottom:2px dotted #bdc6b1;padding:3px 4px;color:var(--ink)}.word:hover,.word.selected{background:var(--green);border-bottom-color:var(--accent);border-bottom-style:solid}.ipa{font-family:'DM Sans',sans-serif;letter-spacing:1px;color:#526159;font-size:16px;margin:12px 0}.translation{margin:17px 0;font-size:18px}.hint{font-size:12px;color:var(--muted);margin-top:22px}.section-title{display:flex;justify-content:space-between;align-items:center;margin:29px 0 16px}.section-title h2{font-size:18px;margin:0}.section-title span{font-size:11px;letter-spacing:2px;color:var(--muted)}.structure{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px}.structure span{border:1px solid var(--line);padding:8px 12px;border-radius:4px;font-size:14px;background:white}.structure small{display:block;color:var(--muted);font-size:12px}.grammar-row{display:grid;grid-template-columns:28px 1fr;gap:10px;margin:18px 0}.grammar-row>span{font:italic 22px Georgia;color:#6b7c55}.grammar-row h3{font-size:15px;margin:0 0 5px}.grammar-row p{font-size:14px;color:#52605e;margin:0;line-height:1.9}.pronunciation{border-left:3px solid #8e9e62;padding:6px 0 6px 17px;margin:28px 0}.pronunciation p{font-size:14px;margin:8px 0}.source-note{font-size:12px;color:var(--muted);margin-top:25px}.source-note summary{cursor:pointer}.source-note a{color:var(--accent)}.word-panel{padding:43px 27px;border-left:1px solid var(--line);background:#fff}.word-panel-heading{display:flex;justify-content:space-between;gap:8px;align-items:baseline}.word-panel-heading .eyebrow{font-size:10px}.word-name{font:46px/1.2 'Libre Caslon Display',Georgia,serif;margin:42px 0 10px;overflow-wrap:anywhere}.word-ipa{font-size:17px;color:var(--muted)}.pos{display:inline-block;background:#edf0e9;padding:4px 9px;font-size:12px;border-radius:3px;margin:22px 0 10px}.meaning{font-size:22px;margin:8px 0 22px}.word-explanation{font-size:14px;line-height:1.9;color:#52605e;border-top:1px solid var(--line);padding-top:20px}.word-play{background:var(--green);width:100%;margin-top:18px;font-weight:600}.word-tip{border-top:1px solid var(--line);margin-top:38px;padding-top:24px}.word-tip p{font-size:13px;color:var(--muted);line-height:1.9}.player{position:fixed;bottom:0;left:0;width:100%;z-index:2;background:var(--ink);color:white;min-height:90px;padding:17px 38px;display:flex;align-items:center;gap:24px;box-shadow:0 -3px 24px #2331380a}.player-track{display:flex;gap:14px;align-items:center;flex:1;min-width:0}.player-icon{background:#3a494d;color:var(--green);font-size:28px;width:48px;height:48px;border-radius:6px;display:grid;place-items:center;flex-shrink:0}.player-track strong{font:18px Georgia,serif;display:block}.player-track span:not(.player-icon){font-size:12px;color:#b8c5c4;display:block;margin-top:5px}.player-controls{display:flex;gap:18px;align-items:center}.player-controls button{background:transparent;border:0;color:#fff;font-size:23px;min-width:38px;min-height:42px}.player-controls .bottom-play{background:var(--green);color:var(--ink);border-radius:50%;width:48px;height:48px;font-size:18px}.voice-label{font-size:12px;color:#c5d0cb;max-width:220px}.voice-label select{color:white;border-color:#64726e;display:block;font-size:12px}.voice-label option{color:var(--ink)}#status{font-size:12px;color:var(--green);min-width:75px}body.hide-translation .translation{display:none}@media(min-width:1500px){main{padding:50px 65px}.workspace{grid-template-columns:280px minmax(380px,1fr) 330px}}@media(max-width:1150px){.workspace{grid-template-columns:220px minmax(330px,1fr)}.word-panel{grid-column:2;border-top:1px solid var(--line);border-left:0;display:grid;grid-template-columns:1fr 170px;gap:0 24px;padding:28px 42px}.word-panel-heading{grid-column:1/-1}.word-name{margin-top:10px}.word-play{align-self:start}.word-tip{grid-column:1/-1;margin-top:20px}.library{grid-row:1/3;padding:32px 15px}main{padding:32px 28px}.header-note{display:none}.voice-label{display:none}}@media(max-width:700px){header{padding:20px;min-height:80px}.brand{font-size:34px}.brand span{display:block;font-size:11px;margin:7px 0 0;letter-spacing:1px}.edition{font-size:11px}.workspace{display:block;padding-bottom:140px}.library{border:0;padding:20px 20px 0}.library>.eyebrow,.library h2,.library-bottom{display:none}nav{grid-template-columns:1fr 1fr;gap:8px}.song{padding:12px 10px;border-color:var(--line);min-height:90px}.song strong{font-size:17px}.song small{font-size:10px}.song-index{display:none}main{padding:26px 20px}.lesson-heading h1{font-size:42px}.lesson-number{font-size:55px}.toolbar{gap:12px;margin-top:26px;font-size:12px}.reading{padding:20px 16px}.word{font-size:33px}.word-panel{padding:25px 20px;display:block}.word-panel-heading{max-width:300px}.word-name{margin-top:20px}.word-play{max-width:300px}.player{padding:14px 18px;gap:12px;flex-wrap:wrap}.player-track strong{font-size:15px}.player-icon{display:none}.player-controls{gap:4px}.player-controls .bottom-play{width:42px;height:42px}.player-track span:not(.player-icon){max-width:210px}#status{width:100%;text-align:center;font-size:11px}.source-note{font-size:13px}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s ease}} 
/* Full-text study and prerecorded audio */
#grammar p{font-size:16px;line-height:1.95;margin:0 0 12px;color:#465751}.reading-top{align-items:flex-start}.reading-top label{min-width:0;flex:1}.reading-top select{display:block;max-width:100%;width:290px;font-size:13px;white-space:nowrap;margin-top:7px}.reading-top .primary{flex-shrink:0}#words{display:block;line-height:2.3;margin-top:24px}.word{display:inline-flex;vertical-align:middle;flex-direction:column;align-items:center;gap:6px;font-size:31px;margin:0 2px 8px;padding:4px 6px;border-bottom-width:1px}.word .inline-ipa{font:12px/1.3 'DM Sans',sans-serif;letter-spacing:0;color:#617063;max-width:180px}.punctuation{font:26px Georgia,serif;vertical-align:middle}.hide-phonetics .inline-ipa{display:none}.line-navigation{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:24px;border-top:1px solid #d4dccd;padding-top:17px}.line-navigation button{border:1px solid #bbc6b3;background:transparent;border-radius:4px;padding:7px 14px;color:var(--ink);font-size:14px}#line-count{font-size:13px;color:var(--muted)}.correction{background:#f7f1df;padding:17px 20px;border-radius:6px;margin:22px 0;font-size:14px;line-height:1.9}.correction p{margin:7px 0 0}.correction[hidden]{display:none}.lyrics-section{border-top:1px solid var(--line);margin-top:28px;padding-top:20px}.lyrics-section>summary{font-size:16px;font-weight:600;cursor:pointer}.lyrics-section ol{list-style:none;margin:18px 0 0;padding:0;max-height:410px;overflow-y:auto;overscroll-behavior:contain}.lyric-row{display:grid;grid-template-columns:25px 1fr 15px;gap:10px;align-items:center;width:100%;text-align:left;border:0;border-radius:5px;background:transparent;padding:14px 12px;color:var(--ink)}.lyric-row:hover{background:#eef2e9}.lyric-row[aria-current=true]{background:#e6edbc}.lyric-row [lang=fr]{font:18px/1.4 Georgia,serif}.lyric-row .translation{display:block;font:13px/1.6 'Noto Sans SC',sans-serif;color:var(--muted);margin:6px 0 0}.lyric-index{font-size:12px;color:var(--muted)}body.hide-translation .lyric-row .translation{display:none}.sequence-controls{display:flex;flex-direction:column;gap:6px;font-size:12px}.sequence-controls button{font-size:13px;padding:5px 10px;background:transparent;color:white;border:1px solid #64726e;border-radius:4px}.sequence-controls button.active{background:var(--green);color:var(--ink)}.sequence-controls label{display:flex;align-items:center;gap:4px}.sequence-controls input{margin:0}.word-panel{position:sticky;top:0;align-self:start;min-height:660px}.source-note{font-size:13px}.player-track strong{line-height:1.35}#status{max-width:160px;font-size:12px}.voice-label{max-width:160px}.word-name{font-size:40px}.pos{font-size:13px;line-height:1.7}.word-tip p{font-size:14px}.small-label{font-size:13px}@media(max-width:1150px){.word-panel{position:static;min-height:0}.word-name{margin-top:10px}.word-play{margin-top:12px}.word-tip{margin-top:18px}.player{gap:16px;padding:15px 25px}.reading-top select{width:220px}}@media(max-width:700px){.player{gap:8px 12px;padding:12px 15px}.player-track{flex-basis:calc(100% - 145px)}.player-controls{flex-basis:125px}.sequence-controls{flex-direction:row;gap:14px;align-items:center;flex:1}#status{width:auto;max-width:160px;min-width:0}.workspace{padding-bottom:155px}.reading-top select{width:180px}.reading-top .primary{padding:10px;font-size:12px}.word{font-size:29px}.reading-top label{font-size:12px}.lesson-heading h1{font-size:38px}.word-panel{padding-bottom:30px}.lyrics-section ol{max-height:370px}.toolbar{gap:14px}.toolbar select{font-size:14px}#grammar p{font-size:16px}.player-track span:not(.player-icon){font-size:11px}.reading{padding:18px 14px}.edition{max-width:115px;text-align:right}}@media(max-width:380px){.reading-top{flex-wrap:wrap}.reading-top select{width:200px}.lesson-heading h1{font-size:34px}.lesson-number{font-size:42px}}