.app-shell{width:100%;max-width:100%;min-width:0;overflow-x:hidden}.app{width:100%;max-width:900px;min-width:0;margin:0 auto;overflow-x:hidden;padding:16px max(20px,env(safe-area-inset-right,0px)) max(64px,env(safe-area-inset-bottom,0px)) max(20px,env(safe-area-inset-left,0px))}.app__header{margin-bottom:8px}.app__brand-badge{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--sai-teal);margin-bottom:12px}.app h1{margin:0 0 8px;font-size:32px;font-weight:700;line-height:1.2;color:var(--sai-navy)}.app__subtitle{margin:0 0 24px;color:var(--sai-slate);font-size:18px;line-height:1.65}.uploader{border:1.5px dashed var(--sai-mid-gray);border-radius:12px;padding:24px 20px;text-align:center;background:#fff;transition:border-color .15s ease,background-color .15s ease;display:flex;flex-direction:column;align-items:stretch;gap:16px}.uploader--compact{padding:12px 14px;border-style:solid;border-color:var(--sai-light-gray);gap:12px}.uploader--dragging{border-color:var(--sai-teal);background:var(--sai-light-gray)}.uploader__hint{margin:0;color:var(--sai-slate);line-height:1.45}.uploader__actions{display:grid;grid-template-columns:1fr;gap:8px}@media(min-width:520px){.uploader__actions{grid-template-columns:repeat(2,1fr)}}.uploader__action{min-height:44px;padding:10px 14px;border:none;border-radius:8px;background:var(--sai-teal);color:#fff;font:inherit;font-size:15px;font-weight:600;cursor:pointer;-webkit-tap-highlight-color:transparent}.uploader__action:hover:not(:disabled){filter:brightness(.95)}.uploader__action:disabled{opacity:.55;cursor:not-allowed}.uploader__action--secondary{background:var(--sai-navy)}.uploader__preview{max-width:120px;max-height:64px;border-radius:4px;object-fit:cover;flex-shrink:0}.uploader__image-row{display:flex;align-items:center;gap:12px;width:100%;min-width:0}.uploader__pdf-preview{display:flex;align-items:center;gap:10px;width:100%;min-width:0;font-size:14px;color:var(--sai-slate)}.uploader__filename{flex:1;text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.uploader__pdf-badge{padding:3px 8px;border-radius:4px;background:var(--sai-navy);color:#fff;font-size:12px;font-weight:700;letter-spacing:.05em;flex-shrink:0}.page-picker{margin-top:12px;max-width:100%;min-width:0}.app--sheet-open .page-picker{margin-top:8px}.app--sheet-open .page-picker__label{font-size:12px;margin-bottom:6px}.app--sheet-open .page-picker__thumb img{width:100%;max-width:none}.page-picker__label{margin:0;font-size:14px;font-weight:500;color:var(--sai-slate)}.page-picker__header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.page-picker__grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;max-width:100%;padding-bottom:4px}.page-picker__thumb{display:flex;flex-direction:column;align-items:center;gap:4px;padding:6px;border:2px solid var(--sai-light-gray);border-radius:8px;background:#fff;cursor:pointer;min-width:0;width:100%;max-width:none}.page-picker__thumb:hover:not(:disabled){border-color:var(--sai-teal)}.page-picker__thumb:disabled{cursor:not-allowed;opacity:.6}.page-picker__thumb--busy{box-shadow:0 0 0 2px var(--sai-teal)}.page-picker__thumb--selected{border-color:var(--sai-teal);background:#eef8f6}.page-picker__thumb img{width:100%;height:auto;border-radius:4px;display:block;aspect-ratio:3 / 4;object-fit:cover;background:#f4f4f4}.page-picker__thumb span{font-size:13px;font-weight:600;color:var(--sai-slate)}.page-picker--chooser{position:fixed;top:max(52px,env(safe-area-inset-top,0px));left:0;right:0;bottom:max(72px,env(safe-area-inset-bottom,0px));z-index:90;margin:0;padding:12px max(12px,env(safe-area-inset-right,0px)) 16px max(12px,env(safe-area-inset-left,0px));background:var(--sai-warm-white);overflow:auto;-webkit-overflow-scrolling:touch}.page-picker--chooser .page-picker__grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.app__sheet-workspace{margin-top:20px}.app--sheet-open{max-width:none;padding:8px max(10px,env(safe-area-inset-right,0px)) calc(76px + env(safe-area-inset-bottom,0px)) max(10px,env(safe-area-inset-left,0px))}.app--sheet-open .app__brand-badge{display:none}.app--sheet-open .app__sheet-workspace{margin-top:2px;display:flex;flex-direction:column;min-height:calc(100dvh - 100px)}.app__reader{flex:1 1 auto;min-height:0;display:flex;flex-direction:column}.app--sheet-open .app__page-stage{flex:1 1 auto;height:auto;max-height:none;min-height:55dvh;padding-bottom:8px}.app--sheet-open .app__page-stage-img{width:100%;min-width:100%;height:auto}.app--sheet-open .app__page-stage-status{bottom:calc(58px + env(safe-area-inset-bottom,0px));z-index:6;border-radius:8px;margin:8px 8px 0;border:1px solid var(--sai-mid-gray);box-shadow:0 1px 4px #1b3a6b1a}.app--sheet-open .page-picker{position:relative;z-index:15;margin:0 0 4px;padding:0;background:transparent;flex-shrink:0}.app__sheet-dock{position:fixed;left:50%;right:auto;transform:translate(-50%);bottom:max(12px,calc(10px + env(safe-area-inset-bottom,0px)));z-index:80;display:flex;flex-direction:column;align-items:stretch;gap:0;margin:0;padding:4px 8px;max-width:min(440px,calc(100% - 16px));width:min(440px,calc(100% - 16px));background:#fffffff7;border:1px solid var(--sai-light-gray);border-radius:10px;box-shadow:0 2px 10px #1b3a6b24;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);flex-shrink:0}.app--sheet-open .app__sheet-dock,.app--score-ready .app__sheet-dock{position:fixed;left:50%;right:auto;transform:translate(-50%);bottom:max(12px,calc(10px + env(safe-area-inset-bottom,0px)));top:auto;z-index:80;margin:0;padding:6px 10px;max-width:min(440px,calc(100% - 16px));width:min(440px,calc(100% - 16px))}.app__sheet-dock--busy{max-width:min(280px,calc(100% - 48px));width:min(280px,calc(100% - 48px));padding:3px 6px}.app__sheet-dock--busy .loop-selector__toggle{font-size:12px;gap:4px}.app__sheet-dock--busy .btn--compact{height:32px;padding:0 12px;font-size:13px}.app__sheet-dock-status{display:none}.app--score-ready .score-player{flex:1 1 auto;min-height:0;display:flex;flex-direction:column;margin:0;max-width:none}.app--score-ready .score-player__viewport{flex:1 1 auto;min-height:calc(100dvh - 210px);max-height:none;height:auto;overflow:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--sai-light-gray);border-radius:8px;background:#fff}.app--score-ready .score-player__host{touch-action:none;user-select:none;-webkit-user-select:none}.app--score-ready .score-player__hint,.app--score-ready .score-player__clear,.app--score-ready .app__playback-controls{display:none}.app--sheet-open .uploader{padding:6px 8px;margin-bottom:4px;gap:4px}.app__sheet-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 12px;margin-bottom:8px;background:#fff;border:1px solid var(--sai-light-gray);border-radius:8px;box-shadow:0 1px 4px #1b3a6b14}.app__sheet-dock .app__sheet-toolbar{width:100%;margin:0;padding:0;border:none;border-radius:0;box-shadow:none;background:transparent;display:flex;flex-direction:column;align-items:stretch;gap:4px}.app__sheet-toolbar-main{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%}.app__sheet-toolbar-left{display:flex;flex-direction:row;flex-wrap:wrap;align-items:center;gap:8px;min-width:0;flex:1}.app__sheet-toolbar-extras{display:flex;align-items:center;gap:10px;width:100%;padding-top:2px}.app__sheet-toolbar-metronome{display:flex;align-items:center;flex-wrap:wrap;gap:6px 8px;width:100%;padding-top:4px;border-top:1px solid var(--sai-light-gray);margin-top:2px}.app__sheet-metronome-label{flex-shrink:0;font-size:11px;font-weight:700;letter-spacing:.02em;text-transform:uppercase;color:var(--sai-navy)}.app__sheet-tempo{display:flex;align-items:center;gap:6px;flex:1;min-width:0;font-size:12px;font-weight:600;color:var(--sai-slate)}.app__sheet-tempo span{flex-shrink:0;min-width:2.5em}.app__sheet-tempo input[type=range]{flex:1;min-width:0;height:28px}.app__sheet-click-along{display:flex;align-items:center;gap:4px;flex-shrink:0;font-size:12px;font-weight:600;color:var(--sai-slate);white-space:nowrap}.app__sheet-metronome{display:flex;align-items:center;gap:6px;flex:1;min-width:0}.app__sheet-metronome-bpm{display:flex;align-items:center;gap:4px;flex:1;min-width:72px;font-size:12px;font-weight:600;color:var(--sai-slate)}.app__sheet-metronome-bpm span{flex-shrink:0;min-width:2em}.app__sheet-metronome-bpm input[type=range]{flex:1;min-width:0;height:28px}.app__sheet-metronome-sig{flex-shrink:0;max-width:4.5rem;height:28px;border:1px solid var(--sai-light-gray);border-radius:6px;background:#fff;font:inherit;font-size:12px;font-weight:600;color:var(--sai-navy)}.app__home-hint{margin:8px 0 0;font-size:13px;line-height:1.4;color:var(--sai-slate)}.app__sheet-toolbar-error{margin:0;max-width:100%;font-size:12px;line-height:1.35;color:#b42318;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.app__playback-controls>.app__sheet-toolbar{margin-bottom:16px}.app__sheet-toolbar .app__actions{flex-shrink:0}.btn--compact{height:40px;padding:0 18px;font-size:15px}.app__playback-controls{margin-top:16px;padding-top:16px;border-top:1px solid var(--sai-light-gray)}.app__playback-controls .tempo-control{margin-top:0}.app__controls{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap}.app__controls-group{display:flex;align-items:flex-end;gap:16px;flex-wrap:wrap}.app__controls-group--options{flex:1;justify-content:flex-end;min-width:min(100%,320px)}.app__actions{display:flex;gap:12px}.instrument-select{position:relative;display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:500;color:var(--sai-slate)}.instrument-select__label{font-size:14px;font-weight:500}.instrument-select--compact{gap:0;min-width:0;flex:1 1 auto;max-width:150px}.instrument-select__trigger{display:flex;align-items:center;justify-content:space-between;gap:6px;height:48px;min-width:180px;width:100%;padding:0 10px 0 12px;border:1.5px solid var(--sai-light-gray);border-radius:8px;background:#fff;color:var(--sai-slate);font-size:16px;font-family:inherit;font-weight:500;cursor:pointer;text-align:left}.instrument-select--compact .instrument-select__trigger{height:36px;min-width:0;padding:0 6px 0 8px;font-size:13px}.instrument-select__trigger:disabled{opacity:.55;cursor:not-allowed}.instrument-select__trigger:focus-visible{outline:2px solid var(--sai-teal);outline-offset:1px}.instrument-select__value{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}.instrument-select__chevron{flex-shrink:0;width:0;height:0;border-left:5px solid transparent;border-right:5px solid transparent;border-top:6px solid var(--sai-mid-gray)}.instrument-select--open .instrument-select__chevron{transform:rotate(180deg)}.instrument-select__menu{position:absolute;left:0;right:0;bottom:calc(100% + 6px);z-index:120;max-height:min(42vh,280px);overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;-webkit-overflow-scrolling:touch;padding:6px 4px 6px 6px;background:#fff;border:1px solid var(--sai-light-gray);border-radius:10px;box-shadow:0 8px 24px #1b3a6b2e;scrollbar-width:auto;scrollbar-color:var(--sai-navy) #e8edf3}.instrument-select__menu::-webkit-scrollbar{width:18px}.instrument-select__menu::-webkit-scrollbar-track{background:#e8edf3;border-radius:9px;margin:4px 0}.instrument-select__menu::-webkit-scrollbar-thumb{background:var(--sai-navy);border-radius:9px;border:3px solid #e8edf3;min-height:48px}.instrument-select__menu::-webkit-scrollbar-thumb:hover{background:var(--sai-teal)}.instrument-select__group+.instrument-select__group{margin-top:6px;padding-top:6px;border-top:1px solid var(--sai-light-gray)}.instrument-select__group-label{padding:4px 10px 2px;font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--sai-mid-gray)}.instrument-select__option{display:block;width:100%;margin:0;padding:10px 12px;border:none;border-radius:6px;background:transparent;color:var(--sai-slate);font:inherit;font-size:14px;font-weight:500;text-align:left;cursor:pointer}.instrument-select__option:hover,.instrument-select__option:focus-visible{background:#2a9d8f1f;outline:none}.instrument-select__option--selected{background:#1b3a6b1a;color:var(--sai-navy);font-weight:600}.btn{height:48px;min-width:44px;padding:0 24px;border-radius:8px;border:none;font-family:inherit;font-size:16px;font-weight:600;letter-spacing:.02em;cursor:pointer;transition:background-color .15s ease}.btn:disabled{background:var(--sai-light-gray);color:var(--sai-mid-gray);cursor:not-allowed;border:none}.btn--primary{background:var(--sai-teal);color:#fff}.btn--primary:hover:not(:disabled){background:var(--sai-teal-dark)}.btn--secondary{background:transparent;color:var(--sai-navy);border:2px solid var(--sai-navy)}.btn--secondary:hover:not(:disabled){background:var(--sai-light-gray)}.status-banner{margin-top:24px;border-radius:12px;overflow:hidden}.status-banner__errors{padding:16px;background:#fdf0f0;border:1px solid var(--sai-danger);border-radius:12px}.status-banner__errors p{margin:.25rem 0;color:var(--sai-danger);font-size:15px}.status-banner__warnings{margin-top:12px;padding:12px 16px;background:var(--sai-warm-white);border-left:3px solid var(--sai-gold);border-radius:4px;color:var(--sai-slate);font-size:14px}.status-banner__warnings summary{cursor:pointer;font-weight:500}.status-banner__warnings p{margin:6px 0 0}.app__success{display:flex;align-items:center;gap:8px;margin-top:20px;color:var(--sai-teal);font-weight:500}.app__omr-hint{margin:8px 0 0;font-size:14px;color:var(--sai-slate)}.tempo-control{display:flex;flex-wrap:wrap;align-items:center;gap:20px}.tempo-control__row{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:500;color:var(--sai-slate)}.tempo-control__row input[type=range]{width:140px;accent-color:var(--sai-teal)}.metronome{margin-top:20px;padding:16px;border:1px solid var(--sai-light-gray);border-radius:12px;background:#fff}.metronome__title{font-size:14px;font-weight:600;color:var(--sai-navy);margin-bottom:10px}.metronome__row{display:flex;align-items:flex-end;gap:16px;flex-wrap:wrap}.metronome__field{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:500;color:var(--sai-slate)}.metronome__field input[type=range]{width:160px;accent-color:var(--sai-teal)}.metronome__field--beats select{height:40px;padding:0 10px;border:1.5px solid var(--sai-light-gray);border-radius:8px;background:#fff;color:var(--sai-slate);font-size:15px;font-family:inherit}.metronome__toggle{height:40px}.metronome__click-along{display:flex;align-items:center;gap:8px;margin-top:12px;font-size:14px;font-weight:500;color:var(--sai-slate);accent-color:var(--sai-teal)}.score-player{margin-top:0;max-width:100%;min-width:0}.score-player__viewport{width:100%;max-width:100%;max-height:min(70vh,900px);overflow:auto;border:1px solid var(--sai-light-gray);border-radius:8px;background:#fff;box-shadow:0 1px 4px #1b3a6b14}.score-player__host{width:100%;max-width:100%;min-width:0;min-height:200px;padding:12px 8px 24px;position:relative;overflow-x:auto}.score-player__hint{margin:8px 0 0;font-size:13px;color:var(--sai-mid-gray)}.score-player__clear{margin-top:8px;height:32px;padding:0 12px;border:1px solid var(--sai-light-gray);border-radius:6px;background:#fff;color:var(--sai-slate);font-size:13px;font-family:inherit;cursor:pointer}.score-player__clear:hover{border-color:var(--sai-teal);color:var(--sai-navy)}.score-player .at-selection{z-index:5;pointer-events:none}.score-player .at-selection div{background:#2a9d8f61!important;border-top:3px solid var(--sai-teal);border-bottom:3px solid var(--sai-teal);box-sizing:border-box}.score-player .at-cursor-bar{background:#e9c46a59}.score-player .at-cursor-beat{background:var(--sai-navy);width:3px;box-shadow:0 0 0 1px #fff,0 0 8px #1b3a6b73}.score-player:not(.score-player--playing) .at-cursor-bar,.score-player:not(.score-player--playing) .at-cursor-beat{opacity:0;pointer-events:none}.score-player .at-highlight *{fill:var(--sai-teal)!important;stroke:var(--sai-teal)!important}.page-picker--chip{margin:0 0 4px}.page-picker__source{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:6px 10px;border:1px solid var(--sai-light-gray);border-radius:8px;background:#fff;color:var(--sai-navy);font-size:13px}.page-picker__source-text{display:flex;align-items:center;gap:6px;min-width:0;overflow:hidden;font-weight:600}.page-picker__source-text strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700}.page-picker__sep{color:var(--sai-mid-gray);font-weight:500}.page-picker__source-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}.page-picker__current{display:inline-flex;align-items:center;gap:8px;padding:6px 10px;border:1px solid var(--sai-light-gray);border-radius:8px;background:#fff;color:var(--sai-navy);font:inherit;font-size:13px;font-weight:600;cursor:pointer}.page-picker__current-action{margin:0;padding:6px 12px;border:none;border-radius:7px;background:var(--sai-teal);color:#fff;font:inherit;font-size:13px;font-weight:700;line-height:1.2;cursor:pointer;-webkit-tap-highlight-color:transparent}.page-picker__current-action:hover,.page-picker__current-action:focus-visible{filter:brightness(.95);outline:none}.page-picker__current-action--muted{padding:6px 8px;background:transparent;color:var(--sai-navy);font-weight:600;text-decoration:underline;text-underline-offset:2px}.page-picker__current-action--muted:hover,.page-picker__current-action--muted:focus-visible{filter:none;color:var(--sai-teal)}.page-picker__current-action:disabled{opacity:.45;cursor:not-allowed;filter:none}.page-picker__done{margin:0;padding:4px 0;border:none;background:none;color:var(--sai-teal);font:inherit;font-size:13px;font-weight:600;cursor:pointer;flex-shrink:0}.loop-selector__toggle--on{color:var(--sai-teal);font-weight:700}.app__sheet-toolbar-hint{margin:0;font-size:11px;line-height:1.3;color:var(--sai-teal);max-width:160px}.app__title-compact{margin:0 0 8px;font-size:20px;font-weight:700;color:var(--sai-navy)}.app--sheet-open .app__header{margin-bottom:2px}.app--sheet-open .app__title-compact{display:none}.app--sheet-open .uploader{padding:8px 10px;margin-bottom:6px;gap:8px}.app--sheet-open .uploader__hint{display:none}.uploader__selected{display:flex;align-items:center;gap:10px;width:100%;min-width:0}.uploader__replace{flex-shrink:0;margin-left:auto;padding:6px 10px;border:1px solid var(--sai-mid-gray);border-radius:6px;background:#fff;color:var(--sai-navy);font:inherit;font-size:13px;font-weight:600;cursor:pointer}.uploader__actions--inline{margin-top:4px}.app__page-stage{width:100%;max-width:100%;margin:0;border:1px solid var(--sai-light-gray);border-radius:10px;background:#fff;overflow:auto;-webkit-overflow-scrolling:touch;box-shadow:0 1px 6px #1b3a6b1a}.app__page-stage-img{display:block;width:100%;height:auto}.app__page-stage-status{margin:0;padding:10px 12px;font-size:13px;font-weight:500;color:var(--sai-slate);background:var(--sai-light-gray);border-top:1px solid var(--sai-mid-gray);position:sticky;bottom:0}.app__photo-ref{margin-top:12px;padding:8px 12px;border:1px solid var(--sai-light-gray);border-radius:8px;background:#fafbfc;font-size:13px;color:var(--sai-slate)}.app__photo-ref summary{cursor:pointer;font-weight:500}.app__photo-ref-img{display:block;width:100%;max-width:280px;margin-top:8px;height:auto;border-radius:4px}.loop-selector__toggle{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:500;color:var(--sai-slate);accent-color:var(--sai-teal);white-space:nowrap}.loop-selector__toggle--overlay{height:40px;margin:0;padding:0 4px;background:transparent}.app__footer{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:64px;padding-top:24px;border-top:1px solid var(--sai-light-gray);color:var(--sai-mid-gray);font-size:13px}.auth-gate,.paywall{min-height:100vh;min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:max(24px,env(safe-area-inset-top,0px)) max(16px,env(safe-area-inset-right,0px)) max(24px,env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px))}.auth-gate__card,.paywall__card{width:100%;max-width:420px;background:#fff;border-radius:12px;padding:28px 22px;border:1px 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