/* Viewport-first practice: natural reflow, then explicit pages when space is limited. */
html,body{width:100%;height:100%;overflow:hidden}body{overscroll-behavior:none}button,select,input{min-width:0}button{min-height:38px}p{overflow-wrap:anywhere}.shell{height:var(--app-height,100dvh);width:100%;max-width:1200px;padding:max(8px,env(safe-area-inset-top)) max(14px,env(safe-area-inset-right)) max(8px,env(safe-area-inset-bottom)) max(14px,env(safe-area-inset-left));display:flex;flex-direction:column;gap:10px}.masthead{height:auto;min-height:48px;flex:none}.brand{font-size:20px;gap:10px}.brand-mark{height:36px;width:36px;font-size:24px}.brand small{font-size:10px;letter-spacing:.4px;margin-top:3px}.header-actions{display:flex;gap:8px}.header-actions button,#close-tools,.pager button,#audio-info{background:var(--card);border:1px solid var(--line);border-radius:5px;color:var(--ink);padding:6px 13px;font-size:12px}.header-actions .recording{color:#9b382c;border-color:#b76655}.mode-switch{margin:0;flex:none;gap:24px}.mode-switch button{font-size:14px;padding:9px 0;margin:0;min-height:38px}.mode-switch button span{display:none}#main{min-height:0;flex:1;position:relative}#practice-content{height:100%;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.12fr);gap:18px;align-items:start;align-content:start}.stack{min-width:0;display:flex;flex-direction:column;gap:10px;background:var(--card);border:1px solid var(--line);border-radius:9px;padding:16px}.reference-stack{grid-column:1}.stack:not(.reference-stack){grid-column:2}body:not(.lab-mode) .reference-stack{max-width:740px;grid-column:1/-1;width:100%;justify-self:center}.flow{display:contents!important}.flow[hidden]{display:none!important}.unit{min-width:0;margin:0}.unit p{font-size:12px;line-height:1.5;margin:0}.unit:empty{display:none}.page-hidden{display:none!important}.panel-top .eyebrow{font-size:9px;letter-spacing:1px}.status{font-size:10px}.note-display,body.lab-mode .note-display{padding:14px 0 4px;gap:20px}.note{font-size:58px;letter-spacing:-2px}.note sub{font-size:21px}.note-caption{font-size:8px;margin-top:7px;max-width:none}.ratio-label{display:block;padding-left:15px}.ratio-label span{font-size:23px}.ratio-label small{font-size:9px;margin-top:4px}.stage-controls{margin:0}.stage-controls p{margin-top:5px}.reference-controls{display:grid;grid-template-columns:95px minmax(0,1fr);align-items:start;gap:12px;padding:0;border:0}.reference-controls #root-note{min-width:0}.reference-controls #interval-field{min-width:0}.reference-controls .muted{display:none}label{font-size:11px}select{min-height:38px;height:38px;margin-top:5px;padding:5px 25px 5px 9px;font-size:12px;max-width:100%}.target-note{font:15px/1.5 Georgia,serif!important}.practice-prompt{margin:0;font-size:13px!important}.quiet-option,.visual-header{padding:10px 12px;gap:12px;margin:0}.quiet-option p{font-size:10px!important;margin-top:4px}.synthetic-controls{padding:0;margin:0;border:0;background:none}.adjust-row{margin-top:5px;gap:10px}.adjust-row button{height:38px;width:38px}.adjust-row input{height:30px}.control-hint{font-size:10px!important;margin-top:3px!important}.tuning-ends{font-size:10px}.lab-actions{margin:0;gap:8px;display:flex;flex-wrap:wrap}.secondary-button{min-height:38px;padding:8px 12px;font-size:11px}.text-button{min-height:32px;padding:4px;font-size:11px}.text-button span{font-size:15px}.record-note{font-size:11px!important}.unit #round-help{font-size:11px!important;line-height:1.4;margin:0}.compare-buttons button{min-height:36px}.unit #result-copy{color:var(--accent)}.unit #result-detail{font-size:10px}.visual-header label{font-size:11px}#beat-canvas{height:65px}#visual-status{font-size:10px;margin-top:5px}.audio-dock{flex:none;display:flex;align-items:center;gap:10px;padding-top:9px;border-top:1px solid var(--line)}.transport{flex:1;margin:0;gap:24px}.play-button{min-height:44px;min-width:185px;padding:8px 20px}.volume-control{max-width:250px}.audio-dock #audio-info{font-size:18px;padding:4px 10px;margin-left:auto;min-height:38px}.pager{display:flex;align-items:center;justify-content:space-between;gap:10px;flex:none}.pager span{font-size:11px;text-align:center;color:var(--muted)}.pager button{min-width:75px}#practice-content.paged{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:10px}#practice-content.paged .stack{display:contents}#practice-content.paged .stack[hidden]{display:none!important}#practice-content.paged .unit{flex:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;clip:rect(0,0,0,0);overflow:hidden;white-space:nowrap}
dialog{color:var(--ink);background:var(--paper);width:min(640px,calc(100% - 24px));height:min(640px,calc(var(--app-height,100dvh) - 24px));max-height:none;max-width:none;border:1px solid var(--line);border-radius:12px;padding:16px;overflow:hidden;margin:auto}dialog[open]{display:flex;flex-direction:column;gap:14px}dialog::backdrop{background:#172d276b}.dialog-head{display:flex;gap:14px;flex:none}.dialog-head select{flex:1;margin:0}.dialog-head button{flex:none}#tool-content{min-height:0;flex:1;display:flex;flex-direction:column;gap:12px}#tool-content [data-tool],#tool-content [data-split-labels],#tool-content [data-split-children],#root-range-controls,#key-scale-controls{display:contents}#tool-content [hidden]{display:none!important}#tool-content .unit,#tool-content [data-unit]{flex:none}#tool-content h2{font:23px/1.3 Georgia,serif;margin:0 0 8px}#tool-content p{font-size:13px;line-height:1.55;margin:0}#tool-content fieldset{border:0;padding:0;margin:0}#tool-content legend{padding:0;font-size:12px;line-height:1.5}#tool-content fieldset label{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:400;min-height:32px}#tool-content fieldset input{height:18px;width:18px;margin:0}#tool-content .root-range-fields{margin:0;gap:14px}#tool-content .guide-actions{margin:0;gap:12px;flex-wrap:wrap}#tool-content .key-route{margin:0;gap:6px}#tool-content .progress-metrics{justify-content:flex-start;text-align:left;gap:25px}#tool-content .progress-metrics strong{font-size:26px}#tool-content .progress-metrics span{font-size:11px}.history-item{display:flex;flex-direction:column;gap:5px;border-bottom:1px solid var(--line);padding:8px 0;font-size:12px;line-height:1.5}.history-item small{font-size:11px;color:var(--muted)}#tool-content .step-pitch{display:flex}#tool-content .recording-header h2{margin:0}#tool-content .recording-header{margin-bottom:8px}#tool-content #record{margin:0}#tool-content #mic-canvas{height:60px;margin:0}#tool-content audio{margin:0 0 8px}#tool-content #a4,#tool-content #tolerance{display:block;margin-top:8px;height:38px;width:100%;border:1px solid var(--line);border-radius:5px;padding:7px}#tool-content .live-roadmap{padding:0;border:0}#tool-content a{color:var(--accent)}
@media(max-width:650px){.shell{gap:8px;padding-left:max(10px,env(safe-area-inset-left));padding-right:max(10px,env(safe-area-inset-right))}.masthead{min-height:44px}.brand{font-size:17px}.brand-mark{width:31px;height:31px;font-size:22px}.brand small{font-size:9px}.header-actions{gap:5px}.header-actions button{font-size:11px;padding:6px 9px}.mode-switch{gap:20px}.mode-switch button{font-size:12px;flex:1;text-align:center;padding:7px 0}#practice-content{grid-template-columns:1fr;gap:10px}.stack:not(.reference-stack){grid-column:1}.stack{padding:12px;gap:8px}.note-display,body.lab-mode .note-display{padding:8px 0 2px}.note{font-size:44px}.note sub{font-size:18px}.note-caption{font-size:7px;margin-top:5px}.ratio-label span{font-size:20px}.ratio-label small{max-width:none}.transport{gap:14px}.play-button{min-width:155px;font-size:12px;padding:8px 12px}.volume-control{font-size:10px}.audio-dock{gap:6px;padding-top:8px}dialog{padding:12px}dialog[open]{gap:10px}.dialog-head{gap:8px}.tuning-ends label{font-size:11px}.target-note{font-size:13px!important}}
@media(max-height:450px){.shell{gap:4px;padding-top:4px;padding-bottom:4px}.masthead{min-height:32px}.brand small,.brand-mark{display:none}.brand{font-size:15px}.header-actions button{min-height:28px}.mode-switch button{min-height:28px;padding:4px 0;font-size:12px}.audio-dock{padding-top:4px}.play-button{min-height:34px}.pager button{min-height:28px;padding:3px 10px}.note-display,body.lab-mode .note-display{padding:5px 0 0}.note{font-size:36px}.note-caption{margin-top:3px}.panel-top{display:none}.unit p{font-size:11px;line-height:1.4}#practice-content.paged{padding:5px;gap:5px}dialog{padding:8px;height:calc(var(--app-height,100dvh) - 12px)}dialog[open]{gap:8px}.dialog-head select,#close-tools{min-height:30px;height:30px}.dialog-head select{font-size:12px}#tool-content{gap:8px}#tool-content p{font-size:12px;line-height:1.4}#tool-content h2{font-size:18px}}
body{position:fixed;top:0;left:0;height:var(--app-height,100dvh)}#key-scale-controls>div:not([data-unit]){display:contents}
#practice-content.paged{align-items:stretch}#practice-content.paged .unit{width:100%}

#tool-content [data-unit]{margin:0}#tool-content legend{margin:0}
@media(max-width:360px){.note-display,body.lab-mode .note-display{gap:10px}.ratio-label{padding-left:8px}.ratio-label small{font-size:8px}.ratio-label span{font-size:19px}}
/* Revision 04: transport immediately adjoins the practice surface, not the screen edge. */
.audio-dock{border-top:0;border-bottom:1px solid var(--line);padding:0 0 8px;margin:0;background:var(--paper)}
@media(max-height:450px){.audio-dock{padding-bottom:4px}}
#result-copy{display:flex;align-items:center;gap:12px;font-size:12px;line-height:1.45}.acceptance-circle{width:64px;height:64px;flex:none;border:2px solid #b28b73;border-radius:50%;display:grid;place-items:center;font-size:14px;font-weight:600;color:var(--ink)}.acceptance-circle.within{border-color:#72855f;background:#edf2e6}#result-assessment{min-width:0}#drone-voicing{color:var(--muted)}.history-item .signed-result{font-size:13px;color:var(--ink)}
@media(max-height:450px){.acceptance-circle{width:48px;height:48px;font-size:12px}#result-copy{font-size:11px;gap:8px}}
@media(max-height:450px){.history-item{font-size:11px;line-height:1.25;gap:3px;padding:4px 0}.history-item small{font-size:10px}.history-item .signed-result{font-size:11px}}

.play-button{position:relative;padding-bottom:19px}#playback-status{position:absolute;bottom:4px;left:0;width:100%;text-align:center;font-size:9px;font-weight:400;line-height:1.1}

#mute-drone[aria-pressed="true"]{background:var(--ink);color:white;border-color:var(--ink)}
@media(max-width:650px){.audio-dock{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:5px}.audio-dock .transport{display:contents}.audio-dock .play-button{min-width:0}.audio-dock #audio-info{grid-column:3;grid-row:1}.audio-dock .volume-control{grid-row:2;grid-column:1/-1;max-width:none;width:100%;display:flex;align-items:center;gap:10px;height:22px;margin:0}.audio-dock .volume-control input{flex:1;width:auto;margin:0}.audio-dock .volume-control span{position:static;min-width:28px}.audio-dock #mute-drone{font-size:10px;padding:5px 9px;min-height:34px}}
@media(max-height:450px){#beat-canvas{height:40px}}

.drone-octave{display:flex;gap:8px;align-items:center;justify-content:space-between}.drone-octave button{white-space:nowrap;padding:7px 10px;min-height:34px}.drone-octave span{font-size:11px;text-align:center}.drone-octave+p{margin:6px 0 0!important;font-size:11px}#custom-transpose-unit input{width:100%}
/* Keep every control reachable in short, zoomed viewports. */
@media(max-height:450px){.audio-dock .play-button{padding:4px 10px 14px;min-height:34px;line-height:12px}.control-hint{display:none}.lab-actions{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:4px}.lab-actions button{min-width:0;min-height:34px;font-size:10px;padding:4px}.practice-prompt{font-size:11px!important;line-height:1.35!important}.audio-dock #audio-info{min-height:34px}.drone-octave button{min-height:30px;padding:4px 8px}.drone-octave span{font-size:10px}}
@media(max-height:300px){.shell{gap:3px}.masthead{min-height:28px}.mode-switch button{min-height:26px}.audio-dock .volume-control{height:18px}.audio-dock .volume-control input{height:16px}.unit #round-help{font-size:10px!important}}