:root{--book-bg: var(--bg);--book-panel: var(--panel);--book-border: var(--border);--book-text: var(--text);--book-text-dim: var(--text-3);--book-accent: var(--accent);--book-on-accent: var(--on-accent)}.book{min-height:100vh;background:var(--book-bg);color:var(--book-text);font-family:var(--font-ui)}.lesson-page,.track-page{font-size:1rem;line-height:1.6}.lesson-page h1,.track-page h1{font-size:1.75rem;font-weight:600;line-height:1.25;letter-spacing:-.01em;margin:0 0 .5rem}.lesson-page h2,.track-page h2{font-size:1.25rem;font-weight:600;line-height:1.3;margin:2rem 0 .5rem}.lesson-page p,.track-page p,.lesson-page li,.track-page li{max-width:68ch}.language-switcher{background:var(--book-panel);color:var(--book-text);border:1px solid var(--book-border);border-radius:4px;padding:.25rem .5rem;font-size:.85rem;font-family:inherit;box-sizing:border-box;height:28px;line-height:1.2}@media (max-width: 640px){.language-switcher{width:2.75rem;padding:.25rem .3rem;overflow:hidden;text-overflow:clip;white-space:nowrap}}.book-content{max-width:960px;margin:0 auto;padding:2rem 1.5rem 4rem}.book-content--wide{max-width:1760px;padding-top:1.25rem;padding-bottom:2rem}.book-status{color:var(--book-text-dim);padding:2rem 0}.book-status--error{color:#e08a8a}.back-link{display:inline-block;color:var(--book-text-dim);text-decoration:none;margin-bottom:1rem;font-size:.9rem}.back-link:hover{color:var(--book-text)}.home-intro{color:var(--book-text-dim);margin-bottom:2rem}.home-intro a{color:var(--book-accent)}.track-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1rem}.track-card{display:flex;flex-direction:column;gap:.35rem;padding:1.25rem;border-radius:10px;background:var(--book-panel);border:1px solid var(--book-border);border-top:3px solid var(--track-color, var(--book-accent));color:var(--book-text);text-decoration:none}.track-card:hover{border-color:#fff3}.track-card-name{font-weight:600}.track-card-tagline{color:var(--book-text-dim);font-size:.85rem}.track-card-progress{margin-top:.5rem;font-size:.8rem;color:var(--book-text-dim)}.apps-intro{color:var(--book-text-dim);margin-bottom:2rem}.app-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1rem}.app-card{display:flex;flex-direction:column;gap:.35rem;padding:1.25rem;border-radius:10px;background:var(--book-panel);border:1px solid var(--book-border);border-top:3px solid var(--app-color, var(--book-accent));color:var(--book-text);text-decoration:none}.app-card:hover{border-color:#fff3}.app-card-emoji{font-size:1.75rem}.app-card-name{font-weight:600}.app-card-tagline{color:var(--book-text-dim);font-size:.85rem}.track-page-description{color:var(--book-text-dim);margin-bottom:1rem}.lesson-list{display:flex;flex-direction:column;gap:.6rem;margin-top:1rem}.lesson-card{display:flex;align-items:flex-start;gap:.75rem;padding:.9rem 1rem;border-radius:8px;background:var(--book-panel);border:1px solid var(--book-border);color:var(--book-text);text-decoration:none}.lesson-card:hover{border-color:#fff3}.lesson-card--done{border-color:var(--book-accent)}.lesson-card-check{width:1.25rem;color:var(--book-accent);font-weight:700}.lesson-card-body{display:flex;flex-direction:column;gap:.25rem}.lesson-card-name{font-weight:600}.lesson-card-description{color:var(--book-text-dim);font-size:.85rem}.browse-search{width:100%;padding:.6rem .8rem;border-radius:8px;border:1px solid var(--book-border);background:var(--book-panel);color:var(--book-text);font-size:.9rem;margin-bottom:.5rem}.lesson-page-description{color:var(--book-text-dim);margin:.5rem 0 1rem}.lesson-complete-toggle{padding:.4rem 1rem;border-radius:6px;border:1px solid var(--book-accent);background:transparent;color:var(--book-accent);font-weight:600;cursor:pointer;margin-bottom:1.5rem}.lesson-complete-toggle:hover{background:#6fe08a1f}.lesson-homework-link{margin-top:1.5rem;color:var(--book-text-dim)}.lesson-homework-link a{color:var(--book-accent)}.pdf-viewer--empty{padding:2rem;text-align:center;color:var(--book-text-dim);background:var(--book-panel);border:1px dashed var(--book-border);border-radius:8px}.pdf-viewer iframe{width:100%;height:70vh;border:1px solid var(--book-border);border-radius:8px}.progress-bar{position:relative;height:1.4rem;border-radius:999px;background:var(--book-panel);border:1px solid var(--book-border);overflow:hidden;margin:.75rem 0 1.25rem}.progress-bar-fill{height:100%;background:var(--book-accent);transition:width .2s ease}.progress-bar-label{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;font-size:.75rem;color:var(--book-text)}.topic-badge{display:inline-block;padding:.15rem .5rem;border-radius:999px;font-size:.7rem;font-weight:600;background:#ffffff14;color:var(--book-text-dim);margin-top:.25rem}.minimal-nav{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;padding:.75rem 1rem 0}.minimal-nav-back,.minimal-nav-sibling{color:var(--text-3);text-decoration:none;font-size:.85rem}.minimal-nav-back:hover,.minimal-nav-sibling:hover{color:var(--text)}.minimal-nav-right{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;justify-content:flex-end}.minimal-nav-support{color:var(--book-accent);text-decoration:none;font-size:.85rem;font-weight:600}.minimal-nav-support:hover{text-decoration:underline}.auth-page{max-width:360px}.auth-google-btn{display:block;width:100%;padding:.65rem 1rem;border-radius:8px;border:1px solid var(--book-border);background:var(--book-panel);color:var(--book-text);font-size:.95rem;font-weight:600;cursor:pointer;margin:1rem 0}.auth-google-btn:hover{border-color:#fff3}.auth-divider{text-align:center;color:var(--book-text-dim);font-size:.8rem;margin:.5rem 0 1rem}.auth-form{display:flex;flex-direction:column;gap:.9rem}.auth-form label{display:flex;flex-direction:column;gap:.3rem;font-size:.85rem;color:var(--book-text-dim)}.auth-form input[type=email],.auth-form input[type=password],.auth-form input[type=text]{padding:.6rem .8rem;border-radius:8px;border:1px solid var(--book-border);background:var(--book-panel);color:var(--book-text);font-size:.9rem}.auth-checkbox{flex-direction:row!important;align-items:center;gap:.5rem!important}.auth-submit-btn{padding:.6rem 1rem;border-radius:8px;border:1px solid var(--book-accent);background:var(--book-accent);color:var(--book-on-accent);font-weight:700;cursor:pointer}.auth-submit-btn:hover{filter:brightness(1.08)}.auth-submit-btn:disabled{opacity:.6;cursor:default}.auth-switch{margin-top:1.25rem;color:var(--book-text-dim);font-size:.85rem}.auth-switch a{color:var(--book-accent)}.book-footer{display:flex;flex-wrap:wrap;gap:.5rem 1.25rem;justify-content:center;padding:1.25rem 1.5rem 1.5rem;border-top:1px solid var(--book-border);font-size:.8rem;color:var(--book-text-dim)}.book-footer a{color:var(--book-text-dim);text-decoration:none}.book-footer a:hover{color:var(--book-text);text-decoration:underline}.auth-agree{font-size:.8rem;color:var(--book-text-dim);margin:.25rem 0 .5rem;line-height:1.5}.auth-agree a{color:var(--book-text);text-decoration:underline}.app-switcher{position:relative;display:flex;align-items:center}.app-switcher-links{display:none;align-items:center;gap:1rem}.app-switcher .app-link{color:var(--text-3);text-decoration:none;font-size:.85rem;white-space:nowrap}.app-switcher .app-link:hover,.app-switcher .app-link[aria-current=page]{color:var(--text)}.site-home{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;flex:0 0 auto;border-radius:var(--radius-control);font-size:1.1rem;line-height:1;text-decoration:none}.site-home:hover{background:var(--raised)}.app-switcher-toggle{box-sizing:border-box;display:inline-flex;align-items:center;gap:4px;height:28px;margin:0;padding:0 8px;border-radius:var(--radius-control);border:1px solid var(--border-strong);background:var(--raised);color:var(--text-2);font:inherit;font-size:.85rem;line-height:1;cursor:pointer;white-space:nowrap}.app-switcher-toggle[aria-expanded=true]{color:var(--text);border-color:var(--line)}.app-switcher-menu{position:absolute;top:calc(100% + 8px);left:0;z-index:60;display:flex;flex-direction:column;min-width:10rem;padding:6px;border-radius:var(--radius-panel);border:1px solid var(--border-strong);background:var(--panel);box-shadow:0 8px 28px #00000059}.app-switcher-menu .app-link{padding:10px;border-radius:var(--radius-control);font-size:.95rem}.app-switcher-menu .app-link[aria-current=page]{background:var(--raised)}@media (min-width: 1024px){.app-switcher-links{display:flex}.app-switcher-toggle,.app-switcher-menu{display:none}}#app{display:flex;flex-direction:column;min-height:100dvh}.fretboard-page{flex:1;min-height:0;background:var(--bg);color:var(--text)}.app{max-width:1080px;margin:0 auto;padding:2rem 1rem;text-align:center}.app.app--embedded{max-width:none;padding:0}.status{min-height:1.5em;color:var(--text-3)}.status--warning{color:var(--accent-text)}.status--stalled{color:var(--record-text)}.status--muted{color:var(--text-4)}.status--recording .rec-dot{color:var(--record)}.link-button{background:none;border:none;padding:0;font:inherit;color:var(--accent-text);text-decoration:underline;cursor:pointer}.debug{font-family:ui-monospace,monospace;font-size:.8rem;color:var(--text-4);margin:-.5rem 0 1rem}.debug-val{display:inline-block;text-align:right}.meter-strip{display:flex;align-items:stretch;gap:0;box-sizing:border-box;height:76px;padding:0;border-radius:var(--radius-panel);background:var(--panel);border:1px solid var(--border);overflow:hidden}.meter-zone{display:flex;flex-direction:column;justify-content:center;gap:2px;box-sizing:border-box;min-width:0;padding:0 14px;text-align:left}.meter-zone+.meter-zone{border-left:1px solid var(--border)}.meter-zone--actions{flex:1 1 auto;flex-direction:row;align-items:center;justify-content:flex-end;gap:10px}.meter-zone--status{flex:0 1 auto}.meter-micro{font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--text-3);white-space:nowrap}.meter-chord{font-size:20px;font-weight:600;line-height:1;color:var(--text-4);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:color .12s ease}.meter-zone--live .meter-chord{color:var(--text)}.meter-chord--analyzing{color:var(--accent-text);animation:meter-analyzing-pulse 1.1s ease-in-out infinite}@keyframes meter-analyzing-pulse{0%,to{opacity:1}50%{opacity:.5}}.meter-state{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:500;color:var(--text-2);white-space:nowrap}.meter-state-dot{width:7px;height:7px;border-radius:50%;background:var(--line)}.meter-state--on .meter-state-dot{background:var(--accent)}.meter-state--on{color:var(--accent-text)}.meter-state--pending .meter-state-dot{background:var(--accent);animation:power-led-blink 1s ease-in-out infinite}.meter-state--error .meter-state-dot{background:var(--record)}.meter-state--error{color:var(--record-text)}.meter-meta{font-size:11px;color:var(--text-4);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.level-ticks{display:flex;justify-content:space-between;width:128px;font-size:11px;color:var(--text-4);line-height:1}.level{display:flex;align-items:flex-end;gap:3px;height:20px}.level-bar{width:4px;height:100%;border-radius:1px;background:var(--line);transition:background 60ms linear}.level-bar--lit{background:var(--accent)}.level-bar:nth-last-child(-n+2).level-bar--lit{background:var(--record)}.field{display:flex;align-items:center;justify-content:space-between;gap:12px;min-width:0;text-align:left}.field-label{font-size:13px;font-weight:400;color:var(--text-2);white-space:nowrap}.field-control{display:flex;align-items:center;gap:8px}.field-label{display:flex;flex-direction:column;gap:2px}.field-sub{font-family:var(--font-mono);font-size:11px;font-weight:400;color:var(--text-4)}.stepper{display:flex;align-items:center;height:34px;border-radius:var(--radius-control);background:var(--raised);border:1px solid var(--border-strong);overflow:hidden}.stepper-btn{width:32px;height:100%;padding:0;border:none;background:none;color:var(--text-2);font:inherit;font-size:15px;line-height:1;cursor:pointer;-webkit-user-select:none;user-select:none;touch-action:manipulation;transition:background .12s ease,color .12s ease}.stepper-btn:hover:not(:disabled){background:#20252b;color:var(--text)}.stepper-btn:disabled{color:var(--text-4);opacity:.45;cursor:default}.stepper-value{min-width:58px;padding:0 4px;font-size:14px;font-weight:500;color:var(--text);text-align:center}.menu-field{position:relative;display:flex;align-items:center;justify-content:space-between;gap:8px;min-width:96px;max-width:168px;height:34px;padding:0 10px;border-radius:var(--radius-control);background:var(--raised);border:1px solid var(--border-strong);color:var(--text);transition:background .12s ease,border-color .12s ease}.menu-field:hover{background:#20252b}.menu-field-value{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.menu-field svg{flex:0 0 auto;color:var(--text-3)}.menu-field-select{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;margin:0;padding:0;border:none;opacity:0;background:none;font:inherit;cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none}.menu-field:has(.menu-field-select:focus-visible){outline:2px solid var(--accent);outline-offset:2px}.switch{width:44px;height:24px;padding:0;border:none;background:none;cursor:pointer}.switch-track{position:relative;display:block;width:100%;height:100%;border-radius:12px;background:var(--raised);border:1px solid var(--border-strong);transition:background .12s ease,border-color .12s ease}.switch-thumb{position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:var(--text-3);box-shadow:0 1px 3px #0009;transition:transform .12s ease,background .12s ease}.switch[aria-checked=true] .switch-track{background:var(--accent-wash);border-color:var(--accent-line)}.switch[aria-checked=true] .switch-thumb{background:var(--accent);transform:translate(20px)}.switch:disabled{opacity:.45;cursor:default}@media (prefers-reduced-motion: reduce){.switch-thumb,.level-bar{transition:none}}.power-led{width:10px;height:10px;border-radius:50%;background:var(--line);box-shadow:none;transition:background .2s ease}.power-led--on{background:var(--record)}.power-led--pending{background:var(--record);animation:power-led-blink 1s ease-in-out infinite}.power-led--error{background:var(--record)}@keyframes power-led-blink{0%,to{opacity:1}50%{opacity:.35}}.listen-led{width:10px;height:10px;border-radius:50%;background:var(--line);box-shadow:none;transition:background .2s ease}.listen-led--on{background:var(--accent)}.listen-led--pending{background:var(--accent);animation:power-led-blink 1s ease-in-out infinite}.listen-led--error{background:var(--record)}.control-panel{position:relative;max-width:720px;margin:1.25rem auto 1.5rem;border-radius:var(--radius-panel);background:var(--panel);border:1px solid var(--border);box-shadow:none}.rack-header{display:flex;align-items:center;width:100%}.rack-drag-handle{display:flex;align-items:center;padding:.7rem 0 .7rem 1.25rem;color:var(--text-4);font-size:1rem;line-height:1;cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none}.rack-drag-handle:active{cursor:grabbing}.rack-toggle{flex:1;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.7rem 1.75rem;border:none;background:transparent;font:inherit;color:inherit;cursor:pointer}.rack-title{font-size:11px;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--text-3)}.rack-chevron{width:7px;height:7px;border-right:2px solid var(--text-3);border-bottom:2px solid var(--text-3);transform:rotate(45deg);transition:transform .2s ease}.rack-chevron--collapsed{transform:rotate(-45deg)}.rack-body{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:center;gap:1.75rem;padding:0 1.75rem 1.1rem;max-height:620px;overflow:hidden;opacity:1;transition:max-height .25s ease,opacity .2s ease,padding-bottom .25s ease}.rack-body--collapsed{max-height:0;padding-bottom:0;opacity:0}.app .control-panel{max-width:none;width:100%;margin:.5rem 0 .6rem;display:flex;flex-direction:column;container-type:inline-size;container-name:rack}.app .rack-grid>.control-panel{margin:0}.app .rack-toggle{padding:.3rem 1rem}.app .rack-body{padding:0 1rem .6rem;justify-content:flex-start;gap:1rem;flex:1 1 auto;align-content:center}.control-panel[data-rack-id=readouts] .rack-body{justify-content:center}.app .rack-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(380px,1fr));gap:.6rem;margin:.5rem 0 .6rem}.control-panel--dragging{opacity:.4}.control-panel--drop-target{outline:2px dashed var(--accent);outline-offset:2px}.knob-group{display:flex;flex-wrap:wrap;align-items:flex-start;gap:1.1rem}.knob-group:not(:first-child){padding-left:2.25rem;border-left:1px solid var(--border)}.knob{display:flex;align-items:center;justify-content:space-between;gap:12px;min-width:0;text-align:left}.knob-label{font-size:13px;font-weight:400;color:var(--text-2)}.knob select{font-family:inherit;font-size:13px;height:34px;padding:0 .6rem;border-radius:var(--radius-control);border:1px solid var(--border-strong);background:var(--raised);color:var(--text);cursor:pointer;transition:background .12s ease,border-color .12s ease}.knob select:hover{background:#20252b}.knob select option,.menu-field-select option{background-color:var(--raised);color:var(--text)}.knob select optgroup,.menu-field-select optgroup{background-color:var(--border-strong);color:var(--text-3);font-weight:600}.color-input{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:3.5rem;height:1.9rem;padding:2px;border-radius:5px;border:1px solid var(--border-strong);background:var(--raised);cursor:pointer}.color-input::-webkit-color-swatch-wrapper{padding:0}.color-input::-webkit-color-swatch{border:none;border-radius:3px}.color-input::-moz-color-swatch{border:none;border-radius:3px}.volume-slider{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:4.5rem;height:4px;border-radius:2px;background:var(--line);cursor:pointer}.volume-slider::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:#fff;border:none;box-shadow:0 1px 3px #0009;cursor:pointer}.volume-slider::-moz-range-track{height:4px;border-radius:2px;background:var(--line)}.volume-slider::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:#fff;border:none;box-shadow:0 1px 3px #0009;cursor:pointer}button{font-family:inherit;font-size:1rem;padding:.5rem 1.5rem;border-radius:var(--radius-control);border:1px solid var(--border-strong);background:var(--raised);color:var(--text);cursor:pointer}button:disabled{opacity:.5;cursor:default}canvas{background:#181c21;border-radius:var(--radius-panel)}.fretboard-canvas-wrap{width:72%;max-width:1080px;aspect-ratio:1080 / 200;max-height:320px;margin:0 auto}.fretboard-canvas-wrap canvas{display:block;width:100%;height:100%}@container rack (max-width: 600px){.app .rack-toggle{padding:.4rem}.app .rack-drag-handle{padding:.4rem 0 .4rem .6rem}.app .rack-body{padding:0 .6rem .5rem;gap:.5rem}.knob-group{gap:.5rem}.knob-group:not(:first-child){padding-left:.75rem}.knob select{padding:.3rem .35rem;font-size:.8rem;max-width:5rem;text-overflow:ellipsis}.app .tempo-input{width:2.75rem;padding:.3rem .35rem;font-size:.8rem}.meter-zone{padding:0 10px}.level-ticks{display:none}.menu-field{min-width:84px;max-width:120px}}@media (max-width: 720px){.fretboard-canvas-wrap{width:100%}}@media (max-width: 480px){.app{padding:1.25rem 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