.piano{touch-action:manipulation;user-select:none;border:1px solid #000;border-radius:10px;width:100%;height:100%;position:relative;overflow:hidden;box-shadow:0 4px 12px #0006}.piano-whites{width:100%;height:100%;display:flex}.piano-white{border-right:1px solid #00000040;flex:1;justify-content:center;align-items:flex-end;padding-bottom:8px;display:flex}.piano-white:last-child{border-right:none}.piano-black{border:1px solid #0a0a0b;border-radius:0 0 4px 4px;justify-content:center;align-items:flex-end;height:62%;padding-bottom:6px;display:flex;position:absolute;top:0}.piano-label{color:#000;font-size:14px;font-weight:700}.piano-label-black{font-size:11px}.notepad{touch-action:manipulation;user-select:none;flex-direction:column;justify-content:center;align-items:center;gap:6px;height:100%;display:flex}.notepad-row{gap:6px;display:flex}.notepad-button{background:#efeff4;border:1px solid #00000024;border-radius:8px;flex-direction:column;justify-content:center;align-items:center;width:min(11vw,82px);min-width:44px;height:min(11vh,74px);min-height:40px;display:flex;box-shadow:0 1px 3px #0000001a}.notepad-natural{background:#fff;border:1.5px solid #00000052}.notepad-token{color:#0000009e;font-size:clamp(14px,2.6vh,25px);font-weight:600;line-height:1}.notepad-natural .notepad-token,.notepad-button[style] .notepad-token{color:#000000eb}.notepad-natural .notepad-token{font-weight:800}.notepad-sub{color:#0000008c;font-size:clamp(9px,1.6vh,15px);font-weight:700;line-height:1.3}.chippad{touch-action:manipulation;user-select:none;flex-direction:column;justify-content:center;align-items:center;gap:8px;height:100%;display:flex}.chippad-row{gap:8px;display:flex}.chippad-chip{color:#000000eb;white-space:nowrap;background:#fff;border:1.5px solid #00000047;border-radius:999px;justify-content:center;align-items:center;width:min(21vw,168px);height:min(7vh,56px);min-height:36px;padding:0 6px;font-size:clamp(11px,2vh,19px);font-weight:700;display:flex;overflow:hidden;box-shadow:0 1px 3px #0000001a}.staff{display:block}.app-shell{background:var(--bg);height:100dvh;display:flex;overflow:hidden}.app-main{flex-direction:column;flex:1;min-width:0;display:flex}.practice{flex-direction:column;height:100%;padding:6px 18px 12px;display:flex}.practice-topbar{align-items:center;gap:8px;display:flex}.level-chip{cursor:pointer;flex:0 auto;align-items:center;gap:6px;min-width:0;display:flex;position:relative}.level-chip select{opacity:0;cursor:pointer;width:100%;position:absolute;inset:0}.level-chip-text{letter-spacing:1.5px;color:#0000008c;white-space:nowrap;text-overflow:ellipsis;font-size:11px;font-weight:700;overflow:hidden}.level-chip-text:before{content:"🎓 "}.topbar-right{align-items:center;gap:12px;margin-left:auto;display:flex}.streak{font-size:13px;font-weight:800}.due{letter-spacing:1.5px;color:#00000073;font-size:11px;font-weight:700}.help-button{color:#0000008c;cursor:pointer;background:0 0;border:1.5px solid #00000059;border-radius:50%;width:28px;height:28px;font-size:15px;font-weight:700}.practice-prompt{flex:5;justify-content:center;align-items:center;min-height:0;display:flex}.practice-prompt-big{flex:7}.practice-surface{flex:6;min-height:0;padding-top:6px}.practice-surface-small{flex:5}.practice-feedback{text-align:center;height:22px;font-size:13px;font-weight:600}.feedback-neutral{color:#0000008c}.feedback-good{color:#2d6a4f}.feedback-bad{color:#b3352c}.prompt{text-align:center;flex-direction:column;align-items:center;gap:8px;min-height:0;max-height:100%;display:flex}.prompt-chips{gap:8px;display:flex}.task-chip{letter-spacing:1.5px;border-radius:10px;padding:3px 10px;font-size:11px;font-weight:800}.task-find{background:var(--find-chip-bg);color:var(--find-chip-fg)}.task-play{background:var(--play-chip-bg);color:var(--play-chip-fg)}.task-fix{background:var(--fix-chip-bg);color:var(--fix-chip-fg)}.task-name{background:var(--name-chip-bg);color:var(--name-chip-fg)}.task-spell{background:var(--spell-chip-bg);color:var(--spell-chip-fg)}.task-identify{background:var(--identify-chip-bg);color:var(--identify-chip-fg)}.task-new{color:var(--ink);background:#6fb4ff40}.prompt-figure{justify-content:center;min-height:0;display:flex}.prompt-figure svg{width:auto;max-width:100%;height:auto;max-height:24vh}.prompt-keyboard{aspect-ratio:3.4;width:min(60vw,480px)}.prompt-subject{max-width:34rem;font-size:clamp(19px,3.5vh,28px);font-weight:800;line-height:1.15}.prompt-detail{color:#0000008c;font-size:15px;font-weight:600}.prompt-notation{color:#00000061;font-size:14px;font-weight:600}.prompt-dots{gap:6px;display:flex}.dot{border:1.5px solid #0000004d;border-radius:50%;width:11px;height:11px}.dot-done{background:var(--green);border:none}.prompt-hint{color:#00000059;font-size:12px;font-weight:500}.sheet-backdrop{z-index:10;background:#00000073;justify-content:center;align-items:flex-end;display:flex;position:fixed;inset:0}.sheet{background:#fff;border-radius:16px 16px 0 0;flex-direction:column;width:100%;max-width:720px;height:92dvh;padding:16px 24px 12px;display:flex}.sheet-header{align-items:center;gap:12px;display:flex}.sheet-level{letter-spacing:1.5px;background:#ffd60a59;border-radius:6px;padding:3px 8px;font-size:11px;font-weight:800}.sheet-title{flex:1;margin:0;font-size:20px;font-weight:800}.sheet-close{cursor:pointer;color:#0009;background:0 0;border:none;font-size:26px;line-height:1}.sheet-body{flex:1;margin-top:8px;overflow-y:auto}.sheet-body p{color:#000c;margin:0 0 10px;font-size:14px;line-height:1.45}.sheet-formula{letter-spacing:.5px;background:#f2f2f4;border-radius:8px;margin-bottom:14px;padding:8px 14px;font-size:14px;font-weight:700;display:inline-block}.sheet-example{max-width:480px}.sheet-example-staff{justify-content:center;display:flex;overflow-x:auto}.sheet-caption{font-style:italic;color:#0000008c!important;margin-top:8px!important;font-size:12px!important}.sheet-actions{justify-content:flex-end;gap:8px;padding-top:10px;display:flex}.button-text{color:#8a6d00;cursor:pointer;background:0 0;border:none;padding:8px 12px;font-size:14px;font-weight:600}.button-filled{background:var(--yellow);color:#000;cursor:pointer;border:none;border-radius:999px;padding:8px 20px;font-size:14px;font-weight:700}.dialog{background:#fff;border-radius:16px;align-self:center;width:min(420px,92vw);max-height:84dvh;margin:auto;padding:20px 24px;overflow-y:auto}.dialog h2{margin:0 0 10px;font-size:18px;font-weight:800}.summary-row{justify-content:space-between;gap:12px;padding:2px 0;font-size:14px;display:flex}.summary-heading{letter-spacing:1.5px;color:#00000073;margin-top:10px;font-size:11px;font-weight:800}.rotate-prompt{display:none}@media (width<=620px) and (orientation:portrait){.rotate-prompt{z-index:100;background:var(--bg);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:2rem;display:flex;position:fixed;inset:0}.rotate-prompt .rotate-icon{font-size:48px}}.nav-rail{background:var(--rail);flex-direction:column;flex-shrink:0;align-items:center;gap:6px;width:56px;padding-top:12px;display:flex}.nav-item{cursor:pointer;filter:grayscale()opacity(.55);background:0 0;border:none;border-radius:12px;width:44px;height:44px;font-size:20px}.nav-item.on{filter:none;background:#ffd60a59}.screen-holder{height:100%}.learn{flex-direction:column;height:100%;display:flex;position:relative}.learn-top{cursor:pointer;flex-direction:column;flex:1;justify-content:center;align-items:center;min-height:0;display:flex}.learn-note{letter-spacing:-4px;font-size:clamp(56px,18vh,120px);font-weight:800;line-height:1}.learn-quality{letter-spacing:10px;color:#00000073;margin-top:10px;font-size:20px;font-weight:500}.learn-staff{max-height:20vh;margin-top:8px}.learn-staff svg{width:auto;max-height:20vh}.learn-divider{background:#00000014;height:1px;margin:0 40px}.learn-bottom{cursor:pointer;flex-direction:column;flex:1;min-height:0;padding:12px 18px;display:flex}.learn-piano{flex:1;min-height:0}.learn-stages{justify-content:center;align-items:center;padding-top:12px;display:flex}.learn-stage-item{align-items:center;display:flex}.learn-stage{letter-spacing:2px;color:#00000047;font-size:11px;font-weight:600}.learn-stage.on{color:#000}.learn-stage-line{background:#0000001f;width:20px;height:1px;margin:0 10px}.learn-stage-line.on{background:#00000080}.learn-settings-button{cursor:pointer;color:#0000008c;background:0 0;border:none;font-size:20px;position:absolute;top:8px;right:8px}.learn-note-chips{flex-wrap:wrap;gap:4px;margin-bottom:12px;display:flex}.filter-chip{cursor:pointer;background:#fff;border:1px solid #00000040;border-radius:8px;padding:5px 10px;font-size:13px}.filter-chip.on{background:#ffd60a66;border-color:#0006}.check-row{cursor:pointer;align-items:center;gap:10px;padding:6px 0;font-size:14px;display:flex}.check-row small{color:#00000073;font-size:12px;display:block}.progress-screen{height:100%;padding:12px 20px 24px;overflow-y:auto}.progress-stats{display:flex}.stat{text-align:center;flex:1}.stat-value{font-size:22px;font-weight:800}.stat-label{letter-spacing:1.2px;color:#00000073;font-size:10px;font-weight:700}.progress-heading{letter-spacing:1.5px;color:#00000073;padding:10px 4px 2px;font-size:11px;font-weight:800}.trouble-row{cursor:pointer;text-align:left;background:0 0;border:none;border-radius:8px;align-items:center;gap:10px;width:100%;padding:5px 4px;font-size:13px;display:flex}.trouble-row:hover{background:#0000000a}.trouble-level{text-align:center;background:#ffd60a59;border-radius:6px;flex-shrink:0;width:34px;padding:2px 0;font-size:11px;font-weight:800}.trouble-label{white-space:nowrap;text-overflow:ellipsis;flex:1;font-weight:600;overflow:hidden}.trouble-stats{color:#0000008c;font-size:12px}.trouble-chevron{color:#0006}.level-tile{background:#f7f7f8;border-radius:14px;margin:5px 0;padding:12px 16px}.level-tile.locked{background:#f4f4f6}.level-tile.current{border:1.5px solid var(--orange);background:#fff8dc}.level-tile-head{align-items:center;gap:10px;display:flex}.level-status{font-size:15px}.level-title-block{flex:1;min-width:0}.level-title{letter-spacing:1.2px;font-size:13px;font-weight:800}.locked .level-title{color:#00000059}.level-tagline{color:#00000080;font-size:12px}.locked .level-tagline{color:#0000004d}.level-blocker{color:#00000073;text-align:right;max-width:40%;font-size:11px}.level-percent{font-size:13px;font-weight:800}.lesson-button{cursor:pointer;filter:grayscale()opacity(.6);background:0 0;border:none;font-size:16px}.level-bar{background:#0000000f;border-radius:3px;height:5px;margin-top:8px;overflow:hidden}.level-bar-fill{background:var(--orange);height:100%}.level-bar-fill.done{background:#74c69d}.item-grid{margin-top:10px}.item-row{flex-wrap:wrap;align-items:center;gap:3px;margin-bottom:4px;display:flex}.item-row-label{color:#00000080;flex-shrink:0;width:120px;font-size:11px}.item-square{color:#0000008c;cursor:pointer;border:none;border-radius:4px;width:22px;height:22px;padding:0;font-size:8px;font-weight:700}.strength-legend{flex-wrap:wrap;justify-content:center;gap:4px 14px;margin-top:12px;display:flex}.legend-chip{color:#0000008c;align-items:center;gap:4px;font-size:11px;display:flex}.legend-swatch{border-radius:3px;width:12px;height:12px}.more-screen{max-width:640px;height:100%;padding:16px 24px 24px;overflow-y:auto}.more-text{color:#0009;margin:0 0 12px;font-size:13px;line-height:1.4}.more-note{color:#00000073;margin:6px 0 28px;font-size:12px}.more-buttons{flex-wrap:wrap;gap:8px;display:flex}.button-outlined{cursor:pointer;background:#fff;border:1.5px solid #00000047;border-radius:999px;padding:8px 20px;font-size:14px;font-weight:600}.more-screen .summary-heading{margin:20px 0 8px}.more-screen .summary-heading:first-child{margin-top:0}.paste-area{resize:vertical;border:1px solid #00000040;border-radius:8px;width:100%;height:140px;padding:8px;font-family:monospace;font-size:11px}.snackbar{color:#fff;z-index:20;cursor:pointer;background:#2c2c2e;border-radius:8px;max-width:80vw;padding:10px 18px;font-size:13px;position:fixed;bottom:18px;left:50%;transform:translate(-50%)}.sync-code{letter-spacing:2px;margin:0 0 12px;font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:20px;font-weight:700}.sync-code small{letter-spacing:0;color:#00000073;font-family:inherit;font-size:11px;font-weight:400;display:block}.code-input{letter-spacing:2px;text-transform:uppercase;border:1.5px solid #00000040;border-radius:8px;width:100%;margin-bottom:4px;padding:10px 12px;font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:18px}