.pc-page{background:var(--pc-background);min-height:100dvh;color:var(--pc-text);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom);font-family:"Source Sans 3",system-ui,sans-serif}.pc-shell{width:100%;min-height:calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom));flex-direction:column;margin:auto;display:flex}.pc-header{align-items:center;gap:8px;width:100%;max-width:1160px;margin:0 auto;padding:10px 16px;display:flex}.pc-heading{flex:1}.pc-heading h1{letter-spacing:-.5px;font-size:22px;font-weight:600;line-height:1.15}.pc-sr-only{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.pc-icon-button.pc-logo{color:var(--pc-accent)}.pc-icon-button{width:44px;height:44px;color:var(--pc-muted);cursor:pointer;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:24px;display:inline-flex}.pc-icon-button:hover{background:var(--pc-panelRaised)}.pc-session{border-top:1px solid var(--pc-border);width:100%;max-width:1160px;color:var(--pc-muted);justify-content:space-between;align-items:center;margin:0 auto;padding:8px 16px 0;font-size:12px;display:flex}.pc-level-control{max-width:calc(100% - 92px);min-height:48px;position:relative}.pc-session-actions{align-items:center;gap:4px;display:flex}.pc-play:disabled{opacity:.45}.pc-level{max-width:100%;min-height:48px;color:var(--pc-muted);font:inherit;text-align:left;cursor:pointer;background:0 0;align-items:center;gap:8px;padding:8px 0;font-size:16px;line-height:1.25;display:flex}.pc-level>span{max-width:160px}.pc-level>svg{flex-shrink:0}.pc-level-menu{z-index:30;border:1px solid var(--pc-border);background:var(--pc-panel);width:216px;max-width:calc(100vw - 32px);max-height:min(60dvh,420px);color:var(--pc-text);box-shadow:0 8px 24px var(--pc-shadow);border-radius:12px;padding:6px;position:absolute;top:100%;left:0;overflow-y:auto}.pc-level-group{color:var(--pc-muted);padding:12px 12px 4px;font-size:12px}.pc-level-menu button{width:100%;min-height:44px;font:inherit;text-align:left;white-space:normal;cursor:pointer;border-radius:8px;padding:10px 12px;font-size:16px;line-height:1.25;display:block}.pc-level-menu button[aria-checked=true]{background:var(--pc-accentSoft);color:var(--pc-accent)}.pc-level-menu button:hover{background:var(--pc-panelRaised)}.pc-level:focus-visible,.pc-level-menu button:focus-visible{outline:2px solid var(--pc-accent);outline-offset:-2px}.pc-exercise{padding-block:24px;flex-direction:column;flex:1;justify-content:flex-start;gap:clamp(12px,2dvh,24px);padding-bottom:clamp(12px,2dvh,24px);display:flex}.pc-instrument{--pc-keyboard-height:clamp(150px, 45vw, 280px);width:calc(100% - 16px);margin:0 8px;padding:8px 0}.pc-keyboard{width:100%;height:var(--pc-keyboard-height);display:block;overflow:hidden;-webkit-mask-image:linear-gradient(90deg,#0000,#000 min(8%,8px) calc(100% - min(8%,8px)),#0000);mask-image:linear-gradient(90deg,#0000,#000 min(8%,8px) calc(100% - min(8%,8px)),#0000)}.pc-keyboard-full{-webkit-mask-image:none;mask-image:none}.pc-instrument:has(.pc-keyboard-full){--pc-keyboard-height:clamp(104px, calc(35.7vw - 10px), 280px)}.pc-keyboard-keys{transform-origin:0 0;transition:transform .36s ease-in-out}@media (prefers-reduced-motion:reduce){.pc-keyboard-keys{transition:none}}.pc-white-key{fill:var(--pc-keyWhite);stroke:var(--pc-keyEdge);stroke-width:1px}.pc-black-key{fill:var(--pc-keyBlack);stroke:var(--pc-keyEdge);stroke-width:1px}.pc-black-key-highlight{fill:none;stroke:var(--pc-keyBlackActive);stroke-width:2px}.pc-tonic-marker circle{fill:var(--pc-accent)}.pc-tonic-marker text{fill:var(--pc-accentText);font-size:18px;font-weight:700}.pc-tonic-legend{background:var(--pc-accent);width:20px;height:20px;color:var(--pc-accentText);border-radius:50%;justify-content:center;align-items:center;font-weight:700;display:inline-flex}.pc-key-backing{fill:var(--pc-panel)}.pc-debug{width:calc(100% - 32px);max-width:560px;margin:0 auto 16px}.pc-debug .lil-gui.lil-root{--background-color:var(--pc-panel);--text-color:var(--pc-text);--title-background-color:var(--pc-panelRaised);--title-text-color:var(--pc-text);--widget-color:var(--pc-border);--hover-color:var(--pc-panelRaised);--focus-color:var(--pc-border);--number-color:var(--pc-accent);--widget-height:44px;--name-width:55%;width:100%}.pc-keyboard-placeholder{height:var(--pc-keyboard-height);background:var(--pc-panelRaised)}.pc-feedback{flex-shrink:0;align-items:safe center;width:100%;max-width:592px;height:clamp(168px,22dvh,224px);margin:0 auto;padding:0 16px;display:flex;overflow-y:auto}.pc-message{background:var(--pc-panel);border-radius:10px;width:100%;padding:16px;font-size:clamp(17px,2.8vw,20px);line-height:1.5}.pc-message strong{font-size:inherit;align-items:center;gap:8px;margin-bottom:8px;font-weight:600;display:flex}.pc-message p{color:var(--pc-muted)}.pc-type-introduction .pc-introduction-tip{margin-block:8px 12px;font-size:.85em}.pc-message-correct strong{color:var(--pc-accent)}.pc-message-wrong{background:var(--pc-errorBg)}.pc-message-wrong strong,.pc-message .pc-wrong-text{color:var(--pc-error)}.pc-controls{flex-shrink:0;width:100%;max-width:592px;margin:auto auto 0;padding:0 8px 16px}.pc-answer{flex-shrink:0;justify-content:center;align-items:center;width:100%;max-width:592px;height:44px;margin:0 auto;padding:0 16px;font-size:26px;font-weight:600;display:flex}.pc-answer-alternate{color:var(--pc-muted);font-size:18px;font-weight:400}.pc-answer-steps{display:grid;overflow:hidden}.pc-answer-step{grid-area:1/1;min-width:0;padding:0 0 6px;transition:transform .28s cubic-bezier(.22,1,.36,1),opacity .2s,visibility}.pc-root-step{opacity:1;visibility:visible;transform:translate(0)}.pc-type-step{opacity:0;visibility:hidden;align-items:center;gap:8px;transition-delay:0s,0s,.28s;display:flex;transform:translate(calc(100% + 12px))}.pc-choosing-type .pc-root-step{opacity:0;visibility:hidden;transition-delay:0s,0s,.28s;transform:translate(calc(-100% - 12px))}.pc-choosing-type .pc-type-step{opacity:1;visibility:visible;transition-delay:0s;transform:translate(0)}.pc-roots{grid-template-rows:repeat(2,minmax(60px,auto));grid-template-columns:repeat(14,minmax(0,1fr));gap:8px 2px;display:grid}.pc-root,.pc-type{border:1px solid var(--pc-border);background:var(--pc-panel);cursor:pointer;border-radius:9px}.pc-root{flex-direction:column;justify-content:center;align-items:center;min-height:48px;font-size:clamp(26px,5vw,32px);font-weight:600;line-height:1.1;display:flex}.pc-note-key{border:2px solid var(--pc-keyEdge);border-radius:9px}.pc-root-natural{background:var(--pc-keyWhite);color:var(--pc-accentText)}.pc-root-accidental{background:var(--pc-keyBlack);color:var(--pc-text)}.pc-root-alternate{color:var(--pc-muted);margin-top:3px;font-size:15px;font-weight:600}.pc-root.pc-root-wrong{color:var(--pc-error);border-color:var(--pc-error);background:var(--pc-errorBg)}.pc-root-wrong .pc-root-alternate{color:inherit}.pc-selected{border-color:var(--pc-accent);background:var(--pc-accentSoft);color:var(--pc-accent)}.pc-types{flex:1;grid-template-columns:repeat(3,minmax(0,1fr));align-self:stretch;gap:8px;display:grid}.pc-type{min-height:48px;font-size:clamp(26px,5vw,32px);font-weight:600}.pc-types-four .pc-type{font-size:16px}.pc-scale-types .pc-type{overflow-wrap:anywhere;padding:4px;font-size:15px;line-height:1.2}.pc-scale-answer{text-align:center;font-size:21px;line-height:1.15}.pc-next{min-height:48px;color:var(--pc-accentText);background:var(--pc-accent);cursor:pointer;border-radius:10px;flex:1;justify-content:center;align-items:center;gap:16px;padding:0 20px;font-size:16px;font-weight:600;display:flex}.pc-next:disabled{background:var(--pc-panelRaised);color:var(--pc-muted)}.pc-page button{touch-action:manipulation;transition:transform .15s,background .15s}.pc-page button:active:not(:disabled){transform:scale(.96)}.pc-page button:disabled{cursor:default}.pc-root:disabled:not(.pc-selected),.pc-type:disabled:not(.pc-selected),.pc-hint:disabled,.pc-back:disabled{opacity:.45}.pc-page :focus-visible{outline:2px solid var(--pc-accent);outline-offset:4px}.pc-settings{border:1px solid var(--pc-border);background:var(--pc-panel);width:calc(100% - 32px);max-width:420px;max-height:80dvh;color:var(--pc-text);border-radius:16px;margin:auto;padding:20px;overflow-y:auto}.pc-settings::backdrop{background:var(--pc-overlay)}.pc-settings-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.pc-settings h2{font-size:22px;font-weight:600}.pc-settings p{color:var(--pc-muted);margin:16px 0;font-size:14px;line-height:1.5}.pc-settings .pc-next{justify-content:center;width:100%;margin-top:20px}.pc-tutorial p svg{vertical-align:middle;color:var(--pc-accent);display:inline}.pc-guide-examples{gap:12px;display:grid}.pc-guide-example{border:1px solid var(--pc-border);background:var(--pc-background);border-radius:10px;min-width:0;padding:12px}.pc-guide-example h3{text-transform:capitalize;color:var(--pc-accent);font-size:18px;font-weight:600}.pc-guide-example figcaption p{margin:2px 0 10px}.pc-guide-example .pc-keyboard{aspect-ratio:2.8;height:auto;margin-top:8px}.pc-guide-notes{white-space:nowrap;justify-content:center;align-items:center;margin-top:10px;display:flex}.pc-guide-tone{align-items:center;gap:6px;display:inline-flex}.pc-guide-tone strong{font-size:17px}.pc-guide-gap{color:var(--pc-muted);padding-left:6px;font-size:13px}.pc-scale-guide-notes{text-align:center;overflow-wrap:anywhere;margin-top:10px;font-size:15px}.pc-scale-steps{flex-wrap:wrap;justify-content:center;gap:6px;margin-top:8px;display:flex}.pc-scale-steps span{background:var(--pc-accentSoft);min-width:26px;height:26px;color:var(--pc-accent);border-radius:6px;justify-content:center;align-items:center;font-weight:600;display:inline-flex}.pc-history-filter{cursor:pointer;align-items:center;gap:10px;min-height:44px;font-size:14px;display:flex}.pc-history-filter input{accent-color:var(--pc-accent);width:20px;height:20px}.pc-history-dialog{width:calc(100% - 24px);max-width:640px;height:min(88dvh,860px);max-height:calc(100dvh - 24px);padding:12px;overflow:hidden}.pc-history-dialog[open]{flex-direction:column;display:flex}.pc-history-dialog .pc-settings-header{flex-shrink:0;margin-bottom:8px}.pc-history-dialog .pc-history-filter,.pc-history-dialog .pc-history-reset{flex-shrink:0}.pc-history-table-scroll{overscroll-behavior:contain;flex:1;min-height:0;margin:8px 0 12px;overflow:auto}.pc-history-table{border-collapse:collapse;font-variant-numeric:tabular-nums;width:100%;font-size:12px}.pc-history-table th,.pc-history-table td{text-align:left;vertical-align:middle;white-space:nowrap;padding:1px 4px;line-height:16px}.pc-history-table thead th{z-index:1;background:var(--pc-panel);color:var(--pc-muted);font-weight:600;position:sticky;top:0}.pc-history-table thead th:first-child{text-align:left;padding-left:0}.pc-history-table tr>:first-child{width:1%;padding-right:20px}.pc-history-table :is(th,td):last-child{padding-right:0}.pc-history-table tbody{border-top:1px solid var(--pc-border)}.pc-history-table tbody tr:first-child>*{padding-top:10px}.pc-history-table tbody tr:last-child>*{padding-bottom:10px}.pc-history-chord{color:var(--pc-accent);font-size:14px;display:block}.pc-history-position{align-items:center;gap:6px;padding-left:8px;display:flex}.pc-history-power{padding-left:0}.pc-history-accuracy{vertical-align:middle;width:12px;height:12px;color:var(--pc-muted);border:1px solid;border-radius:50%;display:inline-block}.pc-history-accuracy-seen{background:currentColor}.pc-history-table .pc-history-heading{text-align:left;color:var(--pc-muted);padding-left:0;font-weight:400}.pc-history-recent{justify-content:flex-start;gap:1px;font-size:14px;line-height:16px;display:flex}.pc-result-correct{color:var(--pc-historyCorrect)}.pc-result-missed{color:var(--pc-historyMiss)}.pc-history-reset{border-top:1px solid var(--pc-border);padding-top:16px}.pc-history-button{border:1px solid var(--pc-border);cursor:pointer;background:var(--pc-panelRaised);border-radius:8px;min-height:44px;padding:8px 14px;font-size:14px}.pc-reset-actions{flex-wrap:wrap;gap:12px;display:flex}.pc-reset-confirm{color:var(--pc-error);border-color:var(--pc-error)}.pc-history-reset [role=status]{color:var(--pc-muted);margin-top:10px;font-size:13px;display:block}@media (min-width:640px){.pc-shell{padding-top:8px}.pc-exercise{padding-top:24px}.pc-root{min-height:56px}}@media (max-height:740px){.pc-header{padding-block:6px}.pc-exercise{gap:8px;padding-block:8px}.pc-feedback{height:152px}.pc-message{padding:12px 14px;font-size:16px}.pc-controls{padding-bottom:12px}}@media (prefers-reduced-motion:reduce){.pc-page button,.pc-answer-step{transition:none}}.pc-feedback-title{flex-wrap:wrap;align-items:baseline;gap:0 8px;margin-bottom:8px;font-size:clamp(25px,4vw,32px);font-weight:600;line-height:1.15;display:flex}.pc-feedback-title>svg{flex-shrink:0;align-self:center}.pc-message-correct .pc-feedback-title{color:var(--pc-accent)}.pc-feedback-position{color:var(--pc-muted);font-size:.65em;font-weight:400}.pc-chord-explorer{width:100%;max-width:592px;margin:0 auto;padding:0 16px}.pc-explorer-heading{min-width:0;font-size:clamp(22px,4vw,30px);font-weight:600;line-height:1.15}.pc-explorer-play{background:var(--pc-panel);width:100%;height:100%;min-height:96px;color:var(--pc-text);cursor:pointer;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:12px 8px;display:flex}.pc-explorer-name{justify-content:center;align-items:center;gap:8px;display:flex}.pc-explorer-play svg{color:var(--pc-accent);flex-shrink:0}.pc-explorer-position{color:var(--pc-muted);font-size:16px;font-weight:400}.pc-inversion-controls{grid-template-columns:76px minmax(0,1fr) 76px;align-items:stretch;gap:8px;display:grid}.pc-inversion-controls.pc-explorer-scale{grid-template-columns:minmax(0,1fr)}.pc-inversion-controls .pc-icon-button{background:var(--pc-panel);width:76px;height:100%;min-height:96px;color:var(--pc-text);border-radius:12px}.pc-inversion-controls button:disabled{opacity:.25;cursor:default}.pc-inversion-controls button:active:not(:disabled),.pc-explorer-play:active{transform:scale(.95)}.pc-controls>.pc-feedback{max-width:none;padding:0 0 6px}.pc-message.pc-chord-feedback{padding:0;overflow:hidden}.pc-feedback-header{background:var(--pc-accent);color:var(--pc-accentText);justify-content:space-between;align-items:center;gap:12px;padding:16px;display:flex}.pc-feedback-header .pc-feedback-title{color:inherit;margin:0}.pc-feedback-header .pc-feedback-position{color:inherit}.pc-feedback-next-arrow{flex-shrink:0}.pc-feedback-explanation{background:var(--pc-panel);color:var(--pc-text);padding:16px;display:block}.pc-feedback-diagram-scroll{display:block;overflow-x:auto}.pc-feedback-diagram{width:100%;display:block}.pc-feedback-axis{margin-inline:48px;display:block}.pc-feedback-tones{height:84px;display:block;position:relative}.pc-feedback-tone{text-align:center;flex-direction:column;align-items:center;gap:4px;width:60px;display:flex;position:absolute;top:0;transform:translate(-50%)}.pc-feedback-note{justify-content:center;align-items:center;min-width:48px;min-height:52px;padding:4px;font-size:clamp(24px,4vw,30px);font-weight:600;line-height:1.2;display:inline-flex}.pc-feedback-role{color:var(--pc-muted);white-space:nowrap;font-size:13px;line-height:1.3}.pc-feedback-counts{color:var(--pc-muted);text-align:center;font-size:12px;line-height:1.3;display:flex}.pc-feedback-interval{flex-direction:column;gap:6px;min-width:0;padding-bottom:4px;display:flex}.pc-feedback-ticks{border-bottom:1px solid var(--pc-border);height:16px;display:grid}.pc-feedback-ticks>span{background:var(--pc-accent);justify-self:center;width:2px;height:12px;display:block}.pc-feedback-scale-notes{flex-wrap:wrap;gap:8px;margin-bottom:12px;display:flex}.pc-feedback-description,.pc-chord-feedback .pc-wrong-text{display:block}.pc-feedback-description{color:var(--pc-muted)}.pc-message.pc-feedback-next-card{border:2px solid var(--pc-accent);background:var(--pc-accent);color:var(--pc-accentText);text-align:left;cursor:pointer}.pc-feedback-next-card:focus-visible{outline:none}.pc-feedback-next-card:active{transform:scale(.99)}.pc-feedback:has(.pc-feedback-next-card){height:auto;overflow:visible}.pc-playback-slot{flex:1;align-items:center;width:100%;min-height:96px;display:flex}.pc-inversion-controls>.pc-playback-prompt{grid-column:2}.pc-explorer-scale>.pc-playback-prompt{grid-column:1}.pc-playback-prompt{background:var(--pc-panel);width:96px;height:96px;color:var(--pc-accent);cursor:pointer;border-radius:50%;justify-content:center;justify-self:center;align-items:center;display:inline-flex}.pc-playback-prompt svg{margin-left:5px}.pc-playback-prompt:active{transform:scale(.95)}.pc-exercise>.pc-feedback{height:auto}.pc-walkthrough-skip{min-height:44px;color:var(--pc-muted);cursor:pointer;border-radius:8px;padding:0 8px;font-size:15px}.pc-walkthrough-controls{flex-direction:column;display:flex}.pc-coach-target{flex-direction:column;min-width:0;display:flex;position:relative}.pc-coach-tip{z-index:20;pointer-events:none;border:1px solid var(--pc-accent);background:var(--pc-panelRaised);color:var(--pc-text);box-shadow:0 8px 24px var(--pc-shadow);border-radius:14px;padding:14px 16px;animation:.22s ease-out pc-coach-enter;position:absolute;bottom:calc(100% + 16px);left:0;right:0}.pc-coach-tip:after{content:"";left:var(--pc-coach-anchor);background:var(--pc-panelRaised);border-right:1px solid var(--pc-accent);border-bottom:1px solid var(--pc-accent);width:14px;height:14px;position:absolute;bottom:-8px;transform:translate(-50%)rotate(45deg)}.pc-coach-tip-heading{justify-content:space-between;align-items:center;gap:12px;margin-bottom:4px;display:flex}.pc-coach-tip strong{color:var(--pc-accent);align-items:center;gap:6px;font-size:20px;font-weight:600;line-height:1.2;display:flex}.pc-coach-tip p{font-size:17px;line-height:1.35}.pc-coach-dots{flex-shrink:0;gap:5px;display:flex}.pc-coach-dots>span{border:1px solid var(--pc-muted);border-radius:50%;width:7px;height:7px}.pc-coach-dots>.pc-coach-dot-current{border-color:var(--pc-accent);background:var(--pc-accent);box-shadow:0 0 0 3px var(--pc-accentSoft)}.pc-coach-dots>.pc-coach-dot-done{border-color:var(--pc-accent);background:var(--pc-accent)}.pc-coach-explorer{width:100%;max-width:592px;margin:0 auto;position:relative}.pc-coach-explorer>.pc-coach-tip{left:16px;right:16px}.pc-type-step.pc-walkthrough-types{opacity:1;visibility:visible;min-height:128px;padding:0;transform:none}[data-coach-target=root] .pc-root[aria-label=C],[data-coach-target=fifth] .pc-type:first-child,[data-coach-target=major] .pc-type:nth-child(2),[data-coach-target=inversion] .pc-inversion-controls>button:last-child{outline:2px solid var(--pc-accent);outline-offset:3px;box-shadow:0 0 0 6px var(--pc-accentSoft)}.pc-walkthrough-note-next{flex:none;justify-content:space-between;min-height:104px;padding:16px;font-size:22px}.pc-walkthrough-controls .pc-feedback-header,.pc-walkthrough-controls .pc-feedback-explanation{padding:12px}@keyframes pc-coach-enter{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.pc-coach-tip{animation:none}}.pc-setting-toggle{cursor:pointer;justify-content:space-between;align-items:center;gap:16px;min-height:64px;margin-bottom:24px;display:flex}.pc-setting-toggle>span{gap:4px;display:grid}.pc-setting-toggle strong,.pc-setting-label{font-size:18px;font-weight:600}.pc-setting-toggle span>span{color:var(--pc-muted);font-size:14px}.pc-setting-toggle input{width:44px;height:44px;accent-color:var(--pc-accent);cursor:pointer;flex-shrink:0}.pc-setting-label{margin-bottom:8px;display:block}.pc-sound-picker{gap:8px;display:flex}.pc-sound-picker select{min-width:0;min-height:48px;font:inherit;border:1px solid var(--pc-border);background:var(--pc-background);color:var(--pc-text);border-radius:10px;flex:1;padding:10px}.pc-sound-preview{border:1px solid var(--pc-border);background:var(--pc-panelRaised);width:48px;min-height:48px;color:var(--pc-accent);cursor:pointer;border-radius:10px;flex-shrink:0;place-items:center;display:grid}