.theme_light,:root{color-scheme:light;--bg:var(--color-white-2);--text:var(--color-black-1);--text-secondary:var(--color-grey-4);--text-tertiary:var(--color-grey-1);--btn-text:var(--color-black-1);--btn-bg:var(--color-white-1);--btn-bg-hover:var(--color-grey-1);--btn-bg-active:var(--color-green-1);--btn-bg-warning:var(--color-red-1);--overlay-bg-rgb:hsla(0,0%,100%,.1);--overlay-bg-hover:var(--color-grey-1);--link-text:var(--color-grey-4);--link-hover:var(--color-black-1);--border-color:var(--color-grey-2);--switch-btn-bg-on:var(--color-grey-2);--switch-btn-bg-off:var(--color-white-1);--switch-btn-bg-thumb:var(--color-black-1);--header-footer-bg:var(--color-white-2);--keyboard-border:var(--color-grey-2);--keyboard-white-key:var(--color-white-1);--keyboard-white-key-clicked:var(--color-grey-1);--keyboard-white-key-bottom:var(--color-grey-2);--keyboard-white-key-bottom_clicked:var(--color-grey-3);--keyboard-black-key-stroke:var(--color-black-1);--keyboard-black-key-center:var(--color-grey-5);--keyboard-black-key-sides:var(--color-grey-5);--keyboard-black-key-bottom:var(--color-grey-4);--keyboard-black-key-center-clicked:var(--color-grey-6);--keyboard-black-key-sides-clicked:var(--color-grey-6);--keyboard-black-key-bottom-clicked:var(--color-grey-5)}.theme_dark{color-scheme:dark;--bg:var(--color-black-1);--text:var(--color-white-2);--text-secondary:var(--color-grey-2);--text-tertiary:var(--color-grey-6);--btn-text:var(--color-white-1);--btn-bg:var(--color-grey-6);--btn-bg-hover:var(--color-grey-5);--btn-bg-active:var(--color-green-1);--btn-bg-warning:var(--color-red-1);--overlay-bg-rgb:rgba(0,0,0,.1);--overlay-bg-hover:var(--color-grey-1);--link-text:var(--color-grey-2);--link-hover:var(--color-white-1);--border-color:var(--color-grey-3);--switch-btn-bg-on:var(--color-grey-4);--switch-btn-bg-off:var(--color-grey-6);--switch-btn-bg-thumb:var(--color-white-2);--header-footer-bg:var(--color-black-1);--keyboard-border:var(--color-grey-4);--keyboard-white-key:var(--color-white-2);--keyboard-white-key-clicked:var(--color-grey-1);--keyboard-white-key-bottom:var(--color-grey-2);--keyboard-white-key-bottom_clicked:var(--color-grey-3);--keyboard-black-key-stroke:var(--color-black-1);--keyboard-black-key-center:var(--color-grey-5);--keyboard-black-key-sides:var(--color-grey-5);--keyboard-black-key-bottom:var(--color-grey-4);--keyboard-black-key-center-clicked:var(--color-grey-6);--keyboard-black-key-sides-clicked:var(--color-grey-6);--keyboard-black-key-bottom-clicked:var(--color-grey-5)}@media (prefers-color-scheme:dark){:root:not(.theme_light){color-scheme:dark;--bg:var(--color-black-1);--text:var(--color-white-2);--text-secondary:var(--color-grey-2);--text-tertiary:var(--color-grey-6);--btn-text:var(--color-white-1);--btn-bg:var(--color-grey-6);--btn-bg-hover:var(--color-grey-5);--btn-bg-active:var(--color-green-1);--btn-bg-warning:var(--color-red-1);--overlay-bg-rgb:rgba(0,0,0,.1);--overlay-bg-hover:var(--color-grey-1);--link-text:var(--color-grey-2);--link-hover:var(--color-white-1);--border-color:var(--color-grey-3);--switch-btn-bg-on:var(--color-grey-4);--switch-btn-bg-off:var(--color-grey-6);--switch-btn-bg-thumb:var(--color-white-2);--header-footer-bg:var(--color-black-1);--keyboard-border:var(--color-grey-4);--keyboard-white-key:var(--color-white-2);--keyboard-white-key-clicked:var(--color-grey-1);--keyboard-white-key-bottom:var(--color-grey-2);--keyboard-white-key-bottom_clicked:var(--color-grey-3);--keyboard-black-key-stroke:var(--color-black-1);--keyboard-black-key-center:var(--color-grey-5);--keyboard-black-key-sides:var(--color-grey-5);--keyboard-black-key-bottom:var(--color-grey-4);--keyboard-black-key-center-clicked:var(--color-grey-6);--keyboard-black-key-sides-clicked:var(--color-grey-6);--keyboard-black-key-bottom-clicked:var(--color-grey-5)}}:root{--color-white-1:#fff;--color-white-2:#f5f5f3;--color-black-1:#222;--color-black-2:#000;--color-grey-1:#dadada;--color-grey-2:#bfbfbf;--color-grey-3:#919191;--color-grey-4:#666;--color-grey-5:#484848;--color-grey-6:#2e2e2e;--color-green-1:#7dca6e;--color-green-2:#346234;--color-orange-1:#fec303;--color-orange-2:#e26a1e;--color-yellow-1:#fdd200;--color-beige-1:#d8cbaf;--color-red-1:#e54b46;--color-blue-1:#66addb;--color-blue-2:#394381;--width_960:960px;--width-360:360px;--height_header:48px;--height_footer:48px;--left_right_body_padding:24px;--label-margin:6px}*{border:0;box-sizing:border-box;margin:0;padding:0}svg{display:block}body{font-family:Helvetica Neue,Helvetica,Arial,Arial Unicode MS,sans-serif;font-size:16px}li{list-style-type:none}a{text-decoration:none}button,div,h1,h2,h3,input,label,li,option,p,select,span,textarea{font-family:inherit;font-weight:400;letter-spacing:-.01em}.no-select{user-select:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}body{background:var(--bg);color:var(--text)}a,a>svg>path{color:var(--link-text)}a:hover,a:hover>svg>path{color:var(--link-hover)}button{background:var(--btn-bg);color:var(--btn-text)}button,div{-webkit-tap-highlight-color:transparent}.select{align-items:center;display:flex;flex-direction:column;font-size:14px;justify-content:center;position:relative}.select__label{color:var(--text-secondary);font-size:12px;margin-top:var(--label-margin)}.select__button{align-items:center;background:var(--btn-bg);border:1px solid var(--border-color);border-radius:16px;color:var(--btn-text);cursor:pointer;display:flex;height:32px;justify-content:center}.select__button:hover{background:var(--btn-bg-hover)}.select__button-text{line-height:1.2em;overflow:hidden;padding:0 4px;text-overflow:ellipsis;white-space:nowrap}.select__button-icon{align-items:center;display:flex;margin-right:2px;padding-left:4px}.select__options{backdrop-filter:blur(16px);background:var(--overlay-bg-rgb);border:1px solid var(--border-color);border-radius:6px;color:var(--btn-text);max-height:192px;overflow-y:auto;position:absolute;z-index:2}.select__option{align-items:center;border-radius:6px;cursor:pointer;display:flex;font-size:14px;margin:4px;overflow:hidden;padding:8px 6px;text-align:left;text-overflow:ellipsis}.select__option:hover{background:var(--overlay-bg-hover)}.select__option_disabled{cursor:not-allowed}.select__option_disabled,.select__option_disabled:hover{background-color:var(--btn-bg-warning)}.select_option_selected{font-weight:700}.select__option-icon{margin-right:8px}.helper{position:relative}.helper__button{align-items:center;background:var(--btn-bg);border:1px solid var(--border-color);border-radius:16px;color:var(--btn-text);cursor:pointer;display:flex;font-size:14px;height:32px;justify-content:center;width:32px}.helper__button:hover{background:var(--btn-bg-hover)}.helper__info{backdrop-filter:blur(16px);background:var(--overlay-bg-rgb);border:1px solid var(--border-color);border-radius:6px;color:var(--btn-text);max-height:192x;overflow-y:auto;position:absolute;width:304px;z-index:2}.helper__text{border-radius:6px;margin:2px;overflow:hidden;padding:6px;text-overflow:ellipsis}.helper__text>*{display:inline}.helper__text,.helper__text h1{font-size:14px}.header{background:var(--header-footer-bg);display:block;height:var(--height_header)}.header__navigation{height:100%;width:100%}.header__navigation-items{gap:12px;height:100%;width:100%}.header__accuracy,.header__navigation-items{align-items:center;display:flex;justify-content:center}.header__accuracy{cursor:default;flex-direction:column;font-size:12px;height:32px;line-height:1;overflow:hidden;width:124px}.header__accuracy-label{color:var(--text-secondary)}.header__accuracy-value{color:var(--text);white-space:nowrap}.logo{fill:var(--color-white-1)}.footer{align-items:center;background:var(--header-footer-bg);color:var(--text-secondary);display:flex;font-size:12px;height:var(--height_footer);justify-content:center}.footer-content{display:flex;height:100%;justify-content:space-between;width:100%}.footer__logo{gap:8px}.footer__address,.footer__logo{align-items:center;display:flex}.footer__address{height:100%}.footer__address svg{margin-right:6px}.footer__address>a{font-style:normal}.footer__address>a,.note{align-items:center;display:flex}.note{background-color:var(--text);border-radius:50%;color:var(--text-tertiary);font-size:8px;justify-content:center;position:absolute;transform:rotate(339deg);transition:background-color .1s;transition:top .3s;z-index:1}.note_active{opacity:1}.note_incorrect{background-color:var(--btn-bg-warning)}.note_correct{background-color:var(--btn-bg-active)}.additional-note-line{background-color:var(--text);height:1px;position:absolute}.note__hint{height:100%;justify-content:center;line-height:0;width:100%}.note__hint,.notes-state{align-items:center;display:flex}.notes-state{color:var(--text);font-size:12px;padding:10px 0}.notes-state__note{align-items:center;animation:notes-state__note .3s ease;border-radius:50%;display:flex;font-size:10px;justify-content:center;padding:10px;position:absolute}@keyframes notes-state__note{0%{opacity:0}to{opacity:1}}.notes-state__incorrect-note{background-color:var(--btn-bg-warning)}.notes-state__correct-note{background-color:var(--btn-bg-active)}.staff{position:relative}.clef-icon,.key-signature-icon{position:absolute;fill:var(--text)}.key-signature-icon>*{animation:key-signature-icon .5s ease}.clef-icon{animation:clef-icon .5s ease}.bass-clef-icon{animation:bass-clef-icon .5s ease}@keyframes key-signature-icon{0%{opacity:0}to{opacity:1}}@keyframes clef-icon{0%{opacity:0}to{opacity:1}}@keyframes bass-clef-icon{0%{opacity:0}to{opacity:1}}.current-position-line{border-left:1px solid var(--text);opacity:.2;position:absolute;transition:left .2s}.line{background-color:var(--text);opacity:.4;width:100%}.midi{flex-direction:column;margin-top:24px}.midi,.midi__button{align-items:center;display:flex;justify-content:center}.midi__button{border:1px solid var(--border-color);border-radius:50%;color:var(--btn-text);cursor:pointer;font-size:12px;height:32px;margin-bottom:var(--label-margin);transition:background .3s;width:32px}.midi__button_disabled{background:var(--btn-bg)}.midi__button_enabled{background:var(--btn-bg-active)}.midi__button_unsupported{background:var(--btn-bg-warning);border:none}.midi__status{color:var(--text-secondary);cursor:default;font-size:12px;height:56px;overflow:hidden;width:100%}.white-key{stop-color:var(--keyboard-white-key)}.white-key_clicked{stop-color:var(--keyboard-white-key-clicked)}.white-bottom{stop-color:var(--keyboard-white-key-bottom)}.white-bottom_clicked{stop-color:var(--keyboard-white-key-bottom_clicked)}.black-key-stroke{stroke:var(--keyboard-black-key-stroke)}.black-key-center{fill:var(--keyboard-black-key-center)}.black-key-sides{fill:var(--keyboard-black-key-sides)}.black-key-center_clicked{fill:var(--keyboard-black-key-center-clicked)}.black-key-sides_clicked{fill:var(--keyboard-black-key-sides-clicked)}.black-key-bottom{stop-color:var(--keyboard-black-key-bottom)}.black-key-bottom_clicked{stop-color:var(--keyboard-black-key-bottom-clicked)}.note-buttons{align-items:center;display:flex;flex-direction:column;margin-bottom:72px}.note-buttons__start-again-message{align-items:center;animation:fadeIn 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.3s;width:32px}.note-buttons__button:hover{background:var(--btn-bg-hover)}.note-buttons__button:active{opacity:1}.note-buttons__keyboard{background:var(--keyboard-border);border-bottom-left-radius:5px;border-bottom-right-radius:5px;display:flex;gap:1px;padding:1px;position:relative}.note-buttons__key{-webkit-tap-highlight-color:transparent;align-items:flex-end;background:none;display:flex;justify-content:center}.note-buttons__key_with-accidentals{align-items:flex-start;position:absolute}.note-buttons__key-hint{color:var(--color-black-1);font-size:8px;margin:4px 0;opacity:0;position:absolute;transition:opacity .3s ease}.note-buttons__key_with-accidentals .note-buttons__key-hint{color:var(--color-white-1)}.note-buttons__key_with-hint{opacity:1}.note-buttons__octave-panel{align-items:center;background:var(--btn-bg);border:1px solid var(--keyboard-border);border-bottom:none;border-top-left-radius:12px;border-top-right-radius:12px;display:flex;height:32px;justify-content:space-between;position:relative;z-index:2}.note-buttons__octave-switch{align-items:center;display:flex;gap:6px;margin-left:12px}.note-buttons__octave-label{color:var(--text-secondary);font-size:12px}.note-buttons__octave-buttons{display:flex;gap:6px;margin-right:12px}.note-buttons__octave-value{color:var(--text);font-size:12px}.note-buttons__octave-button{align-items:center;background:var(--btn-bg);border:1px solid var(--border-color);border-radius:50%;cursor:pointer;display:flex;font-family:monospace;font-size:12px;height:24px;justify-content:center;width:24px}.note-buttons__octave-button:disabled{color:var(--text-secondary);cursor:not-allowed}.note-buttons__octave-button>span{line-height:0}.spinner{animation:rotation 1s linear infinite;border:2px solid var(--text-secondary);border-bottom:2px solid transparent;border-radius:50%;box-sizing:border-box;display:inline-block}@keyframes rotation{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.switch{flex-direction:column;justify-content:center}.switch,.switch__text{align-items:center;display:flex}.switch__text{color:var(--text-secondary);cursor:default;font-size:12px;margin-top:6px}.switch__spinner{margin-left:4px}.switch__button{background:var(--switch-btn-bg-off);border:1px solid var(--border-color);border-radius:16px;cursor:pointer;height:var(--switch-height);position:relative;transition:background .5s;width:var(--switch-width)}.switch__button:before{background:var(--switch-btn-bg-thumb);border-radius:50%;content:"";height:calc(var(--switch-height) - 4px);left:1px;position:absolute;top:1px;transition:transform .4s;width:calc(var(--switch-height) - 4px)}.switch__button_on{background:var(--switch-btn-bg-on)}.switch__button_on:before{transform:translateX(calc(var(--switch-width)/2))}.feedback{backdrop-filter:blur(32px);background:var(--overlay-bg-rgb);border-radius:16px;box-shadow:0 4px 12px rgba(0,0,0,.7);height:320px;left:50%;max-width:340px;position:fixed;top:50%;transform:translate(-50%,-50%);width:100%;z-index:3}.feedback__content{align-items:center;display:flex;flex-direction:column;height:100%;justify-content:center;padding:0 var(--left_right_body_padding);width:100%}.feedback__stars{margin-top:12px}.feedback__star{cursor:pointer;font-size:32px;line-height:1}.feedback__textarea{background:var(--btn-bg);border:1px solid var(--border-color);border-radius:6px;font-size:12px;height:72px;margin-top:12px;outline:none;padding:6px;resize:none;width:240px}.feedback__send-button{background:var(--btn-bg);border:1px solid var(--border-color);border-radius:16px;color:var(--btn-text);cursor:pointer;height:32px;margin-top:24px;padding:8px;width:240px}.feedback__send-button:hover{background:var(--btn-bg-hover)}.feedback__close{background:initial;color:var(--text);cursor:pointer;font-size:18px;position:absolute;right:12px;top:8px}.main{height:100%;width:100%}.application-content{margin:0 auto;max-width:var(--width_960);min-width:var(--width-360);padding:0 var(--left_right_body_padding)}.main__content{margin:16px 0;width:100%}.options-container{align-items:center;flex-wrap:wrap;gap:18px}.centredSection,.options-container{display:flex;justify-content:center}.centredSection{flex-direction:column;min-height:100vh;min-height:100dvh;width:100%}.centredSection_withFooter{min-height:calc(100vh - var(--height_footer));min-height:calc(100dvh - var(--height_footer))}.centredSection_withHeader{min-height:calc(100vh - var(--height_header));min-height:calc(100dvh - var(--height_header))}.centredSection_withFooterAndHeader{min-height:calc(100vh - var(--height_header) - var(--height_footer));min-height:calc(100dvh - var(--height_header) - var(--height_footer))}.centredSection_alignCenter{align-items:center;text-align:center}