:root{
  --ink:#171914;
  --muted:#62675e;
  --paper:#f7f7f2;
  --white:#fff;
  --line:#d8dbd2;
  --red:#d34a34;
  --red-dark:#9d2d20;
  --teal:#277c78;
  --teal-soft:#d8ece8;
  --yellow:#e6b84b;
  --yellow-soft:#f7edc9;
  --blue:#3d648d;
  --dark:#202925;
  --shadow:0 14px 36px rgba(28,36,30,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.6}
button,input,select,textarea{font:inherit}
button,a{touch-action:manipulation}
button{color:inherit}
a{color:inherit}
img{display:block;max-width:100%}
html.zh .en{display:none}
html.en .zh{display:none!important}
html.en .en{display:initial}
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;justify-content:space-between;height:58px;padding:0 clamp(16px,3vw,42px);background:rgba(247,247,242,.95);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800}
.brand-mark{display:grid;place-items:center;width:30px;height:30px;background:var(--ink);color:var(--white);font-size:12px;line-height:1}
.top-actions{display:flex;align-items:center;gap:10px}
.icon-text,.language-switch button{border:1px solid var(--line);background:var(--white);height:34px;padding:0 11px;cursor:pointer}
.icon-text{display:flex;align-items:center;gap:7px}
.language-switch{display:flex}
.language-switch button+button{border-left:0}
.language-switch button[aria-pressed="true"]{background:var(--ink);color:var(--white);border-color:var(--ink)}
main{width:min(1180px,calc(100% - 32px));margin:0 auto}
.opening{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(280px,.75fr);gap:clamp(28px,7vw,92px);align-items:center;min-height:calc(100vh - 112px);padding:52px 0 70px}
.opening-copy{align-self:center}
.eyebrow,.section-index{margin:0 0 10px;color:var(--red);font-size:12px;font-weight:900;letter-spacing:0;text-transform:uppercase}
h1,h2,h3,p{margin-top:0}
h1{max-width:780px;margin-bottom:22px;font-family:Georgia,"Times New Roman","Songti SC",serif;font-size:clamp(52px,8vw,104px);line-height:.95;font-weight:600;letter-spacing:0}
.opening-lede{max-width:740px;margin-bottom:26px;font-size:clamp(18px,2.2vw,25px);line-height:1.5;color:#343a34}
.track-facts{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 30px}
.track-facts span{padding:5px 9px;border-left:3px solid var(--teal);background:var(--white);font-size:13px;font-weight:750}
.primary-actions,.share-buttons,.modal-actions,.note-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.primary-button,.secondary-button{min-height:42px;padding:9px 15px;border:1px solid var(--ink);border-radius:4px;cursor:pointer;font-weight:800}
.primary-button{background:var(--ink);color:var(--white)}
.primary-button:hover{background:var(--red);border-color:var(--red)}
.secondary-button{background:transparent}
.secondary-button:hover{background:var(--white)}
.primary-button:focus-visible,.secondary-button:focus-visible,button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}
.cover-figure{margin:0;align-self:center}
.cover-figure img{width:100%;aspect-ratio:1;object-fit:cover;box-shadow:var(--shadow)}
.cover-figure figcaption{padding:10px 0;color:var(--muted);font-size:12px}
.waveform-lab{padding:48px 0 36px;border-top:1px solid var(--line)}
.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:28px;margin-bottom:26px}
.section-heading.compact{align-items:center;margin-bottom:18px}
.section-heading h2,.content-section>h2{margin-bottom:8px;font-family:Georgia,"Times New Roman","Songti SC",serif;font-size:clamp(31px,4.6vw,58px);line-height:1.05;font-weight:600;letter-spacing:0}
.section-lede{max-width:760px;margin-bottom:0;color:var(--muted);font-size:17px}
.legend{display:flex;flex-wrap:wrap;gap:14px;color:var(--muted);font-size:12px}
.legend>span{display:flex;align-items:center;gap:6px}
.swatch{display:inline-block;width:18px;height:6px}
.swatch.intro{background:var(--yellow)}
.swatch.pass-one{background:var(--teal)}
.swatch.pass-two{background:var(--red)}
.waveform-wrap{position:relative;height:220px;background:var(--dark);overflow:hidden;cursor:crosshair}
#waveform{width:100%;height:100%}
.waveform-playhead{position:absolute;top:0;bottom:0;left:0;width:2px;background:var(--white);pointer-events:none;box-shadow:0 0 0 1px rgba(0,0,0,.2)}
.waveform-label{position:absolute;bottom:8px;color:rgba(255,255,255,.72);font-size:11px;font-weight:800;pointer-events:none}
.waveform-label.start{left:10px}
.waveform-label.end{right:10px}
.pass-label{top:8px;bottom:auto;padding:3px 6px;background:rgba(0,0,0,.38)}
.pass-label.one{left:6%}
.pass-label.two{left:51%}
.full-progress{width:100%;height:24px;margin:8px 0 2px;accent-color:var(--red)}
.now-caption{display:grid;grid-template-columns:68px minmax(0,1fr) 74px;gap:18px;align-items:center;padding:16px 0;border-bottom:1px solid var(--line)}
.now-time{font-variant-numeric:tabular-nums;font-size:22px;font-weight:900}
.now-caption strong{font-size:17px}
.now-caption p{margin:2px 0 0;color:var(--muted);font-size:14px}
.count-display{display:flex;align-items:baseline;justify-content:flex-end;color:var(--red)}
.count-display span{font-size:46px;line-height:1;font-weight:900;font-variant-numeric:tabular-nums}
.count-display small{font-size:12px}
.transport{position:sticky;top:58px;z-index:30;display:grid;grid-template-columns:46px minmax(160px,1fr) auto auto;gap:12px;align-items:center;min-height:70px;margin:0 calc((100vw - min(1180px,calc(100vw - 32px)))/-2);padding:9px max(16px,calc((100vw - min(1180px,calc(100vw - 32px)))/2));background:rgba(255,255,255,.97);border-top:1px solid var(--line);border-bottom:1px solid var(--line);box-shadow:0 7px 20px rgba(20,26,22,.08);backdrop-filter:blur(15px)}
.mini-cover{width:46px;height:46px;object-fit:cover}
.transport-current{display:flex;min-width:0;flex-direction:column}
.transport-current strong,.transport-current span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.transport-current span{color:var(--muted);font-size:12px}
.transport-buttons,.transport-tools{display:flex;align-items:center;gap:6px}
.transport button,.speed-control{display:flex;align-items:center;justify-content:center;gap:5px;min-height:36px;padding:6px 9px;border:1px solid var(--line);background:var(--white);border-radius:4px;cursor:pointer;font-size:12px;font-weight:800}
.transport button[aria-pressed="true"]{background:var(--teal);color:var(--white);border-color:var(--teal)}
.transport-play{width:42px!important;background:var(--ink)!important;color:var(--white)!important;border-color:var(--ink)!important;font-size:16px!important}
.speed-control select{border:0;background:transparent;font-weight:800}
.chapter-nav{display:flex;gap:4px;overflow:auto;padding:36px 0 8px;border-bottom:1px solid var(--line);scrollbar-width:thin}
.chapter-nav a{flex:0 0 auto;padding:7px 10px;text-decoration:none;font-size:13px;font-weight:800}
.chapter-nav a:hover{background:var(--yellow-soft)}
.content-section{padding:84px 0;border-bottom:1px solid var(--line);scroll-margin-top:138px}
.pass-switch{display:flex;flex:0 0 auto}
.pass-switch button{min-height:38px;padding:7px 11px;border:1px solid var(--line);background:var(--white);cursor:pointer;font-size:12px;font-weight:800}
.pass-switch button+button{border-left:0}
.pass-switch button[aria-pressed="true"]{background:var(--teal);color:var(--white);border-color:var(--teal)}
.movement-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.movement-card{position:relative;display:grid;grid-template-columns:52px minmax(0,1fr);gap:16px;padding:18px;border:1px solid var(--line);border-left:5px solid var(--teal);background:var(--white);border-radius:6px}
.movement-card.active{border-left-color:var(--red);box-shadow:0 0 0 2px rgba(211,74,52,.18)}
.movement-number{font-family:Georgia,serif;font-size:40px;line-height:1;color:var(--red)}
.movement-card h3{margin-bottom:4px;font-size:20px}
.movement-meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px;color:var(--muted);font-size:12px}
.move-counts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px;margin:0 0 14px;padding:0;list-style:none}
.move-counts li{min-height:52px;padding:7px;background:var(--paper);font-size:12px;line-height:1.3}
.move-counts li strong{display:block;color:var(--teal);font-size:10px}
.movement-actions{display:flex;align-items:center;justify-content:space-between;gap:12px}
.cue-play{min-height:36px;padding:6px 10px;border:1px solid var(--ink);background:var(--ink);color:var(--white);border-radius:4px;cursor:pointer;font-size:12px;font-weight:800}
.confidence-summary{color:var(--muted);font-size:11px}
.run-strip{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-top:20px;padding:20px 0;border-top:3px solid var(--ink);border-bottom:1px solid var(--ink)}
.run-strip p{margin:3px 0 0;color:var(--muted)}
.instrument-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--line);border-left:1px solid var(--line)}
.instrument{min-width:0;padding:18px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.instrument-code{display:grid;place-items:center;width:42px;height:42px;margin-bottom:14px;color:var(--white);font-weight:900}
.instrument-code.vibes{background:var(--red)}
.instrument-code.clarinet{background:var(--blue)}
.instrument-code.piano{background:var(--ink)}
.instrument-code.drums{background:var(--teal)}
.instrument h3{margin-bottom:8px}
.instrument p{color:var(--muted);font-size:14px}
.instrument button{padding:6px 0;border:0;border-bottom:1px solid var(--ink);background:transparent;cursor:pointer;font-size:12px;font-weight:800}
.instrument.is-listening{background:var(--yellow-soft)}
.caption-track{display:grid;grid-template-columns:140px minmax(0,1fr);margin-top:24px;background:var(--dark);color:var(--white)}
.caption-label{display:grid;place-items:center;padding:22px;background:var(--red);font-weight:900}
.caption-content{padding:20px 24px}
.caption-content p{margin:4px 0 0;color:#c9d2cc}
.evidence-note{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:16px 0 0;color:var(--muted);font-size:12px}
.evidence-note a{font-weight:800}
.technique-list{border-top:1px solid var(--line)}
.technique-row{display:grid;grid-template-columns:220px 1fr 1fr;gap:24px;padding:22px 0;border-bottom:1px solid var(--line)}
.technique-row h3{margin:0}
.technique-row p{margin:0;color:var(--muted);font-size:14px}
.technique-row strong{display:block;margin-bottom:5px;color:var(--ink);font-size:11px;text-transform:uppercase}
.safety-band{display:grid;grid-template-columns:180px 1fr;gap:30px;margin-top:28px;padding:24px;background:var(--yellow-soft);border-left:6px solid var(--yellow)}
.safety-band p{margin:0}
.palace-path{display:grid;grid-template-columns:repeat(8,minmax(105px,1fr));overflow:auto;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.palace-room{position:relative;min-width:105px;padding:16px 12px 18px;border-right:1px solid var(--line);cursor:pointer}
.palace-room:last-child{border-right:0}
.palace-room .room-number{color:var(--red);font-size:11px;font-weight:900}
.palace-room h3{margin:16px 0 7px;font-size:15px}
.palace-room p{margin:0;color:var(--muted);font-size:12px;line-height:1.4}
.palace-room:hover{background:var(--white)}
.palace-room::after{content:"→";position:absolute;right:-8px;top:22px;z-index:2;display:grid;place-items:center;width:16px;height:16px;background:var(--paper);font-size:11px}
.palace-room:last-child::after{display:none}
.recall-panel{margin-top:22px;padding:24px;border-left:6px solid var(--red);background:var(--white)}
.recall-room{font-family:Georgia,serif;font-size:32px;margin-bottom:8px}
.recall-prompt{color:var(--muted)}
#recallAnswer{margin:16px 0 0;font-weight:800}
.notebook-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:44px}
.confidence-board h3,.notes-editor h3{margin-bottom:16px}
.confidence-row{display:grid;grid-template-columns:minmax(100px,1fr) auto;gap:12px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}
.confidence-buttons{display:flex}
.confidence-buttons button{padding:5px 8px;border:1px solid var(--line);background:var(--white);cursor:pointer;font-size:11px}
.confidence-buttons button+button{border-left:0}
.confidence-buttons button[aria-pressed="true"]{background:var(--teal);color:var(--white);border-color:var(--teal)}
.notes-editor label{display:block;margin:0 0 6px;font-size:12px;font-weight:850}
.notes-editor input,.notes-editor textarea{width:100%;margin:0 0 16px;padding:11px;border:1px solid var(--line);border-radius:4px;background:var(--white)}
.notes-editor textarea{resize:vertical}
.note-actions{justify-content:space-between}
#saveState{color:var(--muted);font-size:12px}
.run-count{margin:16px 0 0;color:var(--muted)}
.source-layout{display:grid;grid-template-columns:minmax(260px,.85fr) minmax(0,1.15fr);gap:42px;align-items:start}
.source-image{text-decoration:none}
.source-image img{width:100%;max-height:720px;object-fit:contain;object-position:top;background:var(--white);border:1px solid var(--line)}
.source-image span{display:inline-block;margin-top:8px;font-size:12px;font-weight:800}
.source-transcript{border-top:1px solid var(--line)}
.transcript-row{display:grid;grid-template-columns:34px 1fr;gap:14px;padding:12px 0;border-bottom:1px solid var(--line)}
.transcript-row .n{color:var(--red);font-weight:900}
.transcript-row p{margin:0;font-size:14px}
.uncertain{display:inline-block;margin-left:6px;padding:1px 5px;background:var(--yellow-soft);color:#704e00;font-size:10px;font-weight:800}
.credits-section{border-bottom:0}
.credits-grid{display:grid;grid-template-columns:1fr 1fr;gap:52px}
.credits-grid p{color:var(--muted)}
.source-links{display:flex;flex-wrap:wrap;gap:12px}
.source-links a{color:var(--ink);font-weight:800}
.method-caveat{padding-left:14px;border-left:3px solid var(--yellow)}
.site-footer{display:flex;justify-content:space-between;gap:28px;width:min(1180px,calc(100% - 32px));margin:0 auto;padding:34px 0 52px;border-top:3px solid var(--ink);font-size:12px}
.site-footer a{font-weight:850}
.site-footer p{max-width:620px;margin:0;color:var(--muted);text-align:right}
.modal{width:min(760px,calc(100% - 28px));padding:24px;border:1px solid var(--ink);border-radius:6px;background:var(--paper);box-shadow:0 30px 80px rgba(0,0,0,.3)}
.modal::backdrop,.stage-dialog::backdrop{background:rgba(13,18,15,.78);backdrop-filter:blur(5px)}
.modal-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:22px}
.modal-head h2{margin:0;font-family:Georgia,serif;font-size:34px}
.modal-close,.stage-close{display:grid;place-items:center;width:36px;height:36px;padding:0;border:1px solid var(--line);background:var(--white);cursor:pointer;font-size:22px}
.share-layout{display:grid;grid-template-columns:220px 1fr;gap:22px}
.qr-panel{padding:5px;background:var(--white)}
.qr-panel img{width:100%;height:auto}
#shareText{width:100%;margin-bottom:12px;padding:10px;border:1px solid var(--line);background:var(--white);resize:none}
.social-menu{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}
.social-menu a,.social-menu button{padding:5px 8px;border:1px solid var(--line);background:var(--white);border-radius:3px;text-decoration:none;cursor:pointer;font-size:11px;font-weight:800}
.compact-modal{width:min(590px,calc(100% - 28px))}
.calibration-fields{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0}
.calibration-fields label{font-size:12px;font-weight:800}
.calibration-fields input{width:100%;margin-top:6px;padding:9px;border:1px solid var(--line);background:var(--white)}
.modal-actions{justify-content:flex-end}
.stage-dialog{width:100vw;max-width:none;height:100vh;max-height:none;margin:0;padding:clamp(20px,5vw,70px);border:0;background:var(--dark);color:var(--white)}
.stage-close{position:absolute;top:20px;right:20px;background:transparent;color:var(--white)}
.stage-pass{color:var(--yellow);font-size:15px;font-weight:900;text-align:center}
.stage-count{display:flex;align-items:baseline;justify-content:center;margin:3vh 0 0;color:var(--red)}
.stage-count span{font-size:clamp(120px,24vw,320px);line-height:.88;font-weight:900}
.stage-count small{font-size:24px}
.stage-dialog h2{margin:2vh 0 10px;text-align:center;font-family:Georgia,serif;font-size:clamp(36px,7vw,94px);line-height:1}
.stage-dialog>p{max-width:900px;margin:0 auto;text-align:center;color:#d5ddd7;font-size:clamp(18px,2.4vw,30px)}
.stage-next{display:flex;justify-content:center;gap:12px;margin-top:4vh;color:#9eaaa2}
.stage-next strong{color:var(--white)}
.stage-controls{display:flex;justify-content:center;gap:12px;margin-top:4vh}
.stage-controls button{width:64px;height:50px;border:1px solid #57635c;background:transparent;color:var(--white);cursor:pointer;font-size:18px}
#stagePlay{background:var(--red);border-color:var(--red)}
@media (max-width:980px){
  .transport{grid-template-columns:40px minmax(120px,1fr) auto}.transport-tools{grid-column:1/-1;justify-content:center}.transport{padding-top:8px;padding-bottom:8px}
  .instrument-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .palace-path{grid-template-columns:repeat(8,130px)}
}
@media (max-width:760px){
  main{width:min(100% - 24px,1180px)}
  .topbar{padding:0 12px}.brand>span:last-child{display:none}.icon-text{padding:0 9px}
  .opening{grid-template-columns:1fr;gap:14px;min-height:auto;padding:24px 0 26px}.opening-copy{order:2}.cover-figure{order:1;width:min(40vw,150px)}
  h1{margin-bottom:14px;font-size:clamp(42px,12vw,54px);overflow-wrap:break-word}
  .opening-lede{margin-bottom:18px}.track-facts{margin-bottom:18px}
  .waveform-lab{padding-top:36px}.section-heading,.section-heading.compact{align-items:flex-start;flex-direction:column}.legend{gap:8px}
  .waveform-wrap{height:170px}.now-caption{grid-template-columns:54px 1fr 50px;gap:9px}.count-display span{font-size:34px}.now-caption p{font-size:12px}
  .transport{top:58px;grid-template-columns:36px minmax(0,1fr) auto;margin:0 -12px;padding-left:12px;padding-right:12px}.mini-cover{width:36px;height:36px}.transport-current strong{font-size:12px}.transport-buttons button:not(.transport-play){display:none}.transport-tools{justify-content:flex-start;overflow:auto}.transport-tools button,.speed-control{flex:0 0 auto}
  .speed-control>span{display:none!important}
  .content-section{padding:62px 0;scroll-margin-top:178px}
  .movement-grid{grid-template-columns:1fr}.movement-card{grid-template-columns:38px 1fr;padding:14px;gap:10px}.movement-number{font-size:32px}.move-counts{grid-template-columns:repeat(2,minmax(0,1fr))}
  .pass-switch{width:100%;overflow:auto}.pass-switch button{flex:1 0 auto}
  .run-strip{align-items:flex-start;flex-direction:column}
  .instrument-grid{grid-template-columns:1fr}.caption-track{grid-template-columns:1fr}.caption-label{place-items:start;padding:10px 16px}
  .technique-row{grid-template-columns:1fr;gap:10px}.safety-band{grid-template-columns:1fr;gap:8px}
  .notebook-layout,.source-layout,.credits-grid{grid-template-columns:1fr;gap:30px}
  .site-footer{align-items:flex-start;flex-direction:column}.site-footer p{text-align:left}
  .share-layout{grid-template-columns:1fr}.qr-panel{width:210px;margin:0 auto}.calibration-fields{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}