@import url('data:text/css,');
:root{--ink:#29382f;--muted:#6e786e;--paper:#f8f8f1;--white:#fff;--line:#e3e6d9;--green:#d7ee98;--sage:#ecf0e3;--dark:#293c31;--purple:#775b83;--lavender:#ece3f1}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:15px;line-height:1.5}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.46}button,a,select,input{outline-offset:4px}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid #796286}button{transition:background .15s,transform .15s}button:hover:not(:disabled){filter:brightness(.96)}a{color:inherit}button:active:not(:disabled){transform:translateY(1px)}.header{max-width:1320px;margin:auto;padding:25px 48px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:17px;letter-spacing:-.5px;font-weight:600}.brand b{font-weight:400;color:var(--muted)}.brand-icon{background:var(--dark);color:var(--green);border-radius:11px;width:35px;height:35px;display:grid;place-items:center;font-size:26px}.header-right{display:flex;gap:32px;align-items:center}.private-badge{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:7px}.private-badge i{width:6px;height:6px;background:#80935b;border-radius:50%}.text-button{border:0;padding:0;background:none;color:var(--ink);font-size:13px;font-weight:600;display:inline-flex;gap:14px;align-items:center}.text-button span{font-size:19px}main{max-width:1224px;padding:0 36px;margin:auto}.hero{display:grid;grid-template-columns:1.1fr 1fr;padding:55px 0 43px;align-items:center}.eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;margin:0 0 17px;display:block}.hero .eyebrow{display:flex;gap:8px;align-items:center}.eyebrow span{display:inline-block;width:15px;height:3px;background:var(--purple)}h1{font-size:64px;line-height:1.02;letter-spacing:-3.6px;margin:0;font-weight:500}h1 em{font-family:Georgia,'Times New Roman',serif;font-weight:400;color:var(--purple)}.hero-copy{font-size:15px;color:var(--muted);margin:22px 0 0;line-height:1.65}.hero-art{position:relative;justify-self:center;width:400px;height:240px}.orbit{position:absolute;top:55px;left:35px;width:330px;height:125px;border:1px solid #d5dbc5;border-radius:50%;transform:rotate(-24deg)}.orbit-two{transform:rotate(24deg)}.orbit-three{transform:rotate(90deg);width:240px;left:80px}.art-note{position:absolute;border:1px solid #cbdab2;box-shadow:0 5px 0 #edf0e1;width:84px;height:84px;border-radius:50%;background:var(--green);display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:35px;line-height:1}.art-note span{font-size:8px;letter-spacing:2px;margin-top:8px}.n-one{left:34px;top:100px;transform:rotate(-7deg)}.n-two{left:154px;top:9px;background:var(--lavender);border-color:#ded1e5;transform:rotate(7deg)}.n-three{right:27px;top:102px;background:#f2ead5;border-color:#e3d9bd;transform:rotate(8deg)}.wave{position:absolute;left:157px;top:105px;font-size:41px;letter-spacing:-10px;color:var(--purple)}.art-caption{position:absolute;bottom:2px;left:55px;font-size:8px;letter-spacing:1.8px;color:var(--muted)}.lab{scroll-margin-top:18px}.lab-heading{display:flex;justify-content:space-between;align-items:center;margin:16px 0 24px}.lab-heading .eyebrow{margin-bottom:5px;color:var(--muted);font-size:9px}h2{margin:0;font-size:24px;letter-spacing:-.8px;font-weight:500}.project-actions{display:flex;gap:8px}.small-button{padding:8px 12px;border:1px solid var(--line);border-radius:6px;background:transparent;font-size:11px;color:var(--ink)}.tabs{display:flex;border:1px solid var(--line);border-bottom:0;border-radius:12px 12px 0 0;background:#f0f2e8;padding:6px;gap:4px}.tabs button{border:0;background:transparent;color:var(--muted);border-radius:7px;padding:14px 12px;flex:1;font-size:13px;white-space:nowrap}.tabs button span{font-size:10px;opacity:.6;margin-right:7px}.tabs button.active{background:var(--dark);color:var(--white);box-shadow:0 2px 3px #20302412}.workspace{border:1px solid var(--line);display:grid;grid-template-columns:255px 1fr;background:var(--white);min-height:410px}.controls{padding:27px 25px;background:#fbfcf7;border-right:1px solid var(--line)}.control-title{font-size:9px;letter-spacing:1.2px;color:var(--muted);margin-bottom:22px;display:flex;align-items:center;gap:7px}.tiny-dot{width:5px;height:5px;background:var(--ink);border-radius:50%}label{display:block;font-size:11px;font-weight:600;margin-bottom:7px}input[type=text],input:not([type]),select{width:100%;border:1px solid #dbe0d0;border-radius:6px;color:var(--ink);background:white;padding:10px 11px;min-height:40px;font-size:13px}.input-note{position:relative}.input-note input{font-family:Georgia,serif;font-size:24px;min-height:51px}.input-note span{position:absolute;right:13px;top:13px;color:#85946d}.field-help{font-size:10px;color:var(--muted);margin:6px 0 18px;line-height:1.5}.controls select{margin-bottom:18px}.context-note{border-top:1px solid var(--line);padding-top:18px;margin-top:6px;display:flex;gap:10px}.context-note span{color:#8e9e74;font-size:19px}.context-note p{margin:0;font-size:10px;line-height:1.6;color:var(--muted)}.result{padding:29px 31px 25px;min-width:0}.result-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.result-kicker{font-size:9px;letter-spacing:1.3px;color:var(--muted);margin-bottom:4px}h3{font-size:25px;letter-spacing:-.6px;font-weight:500;margin:0}.pill{font-size:9px;padding:5px 9px;background:var(--sage);border-radius:15px;white-space:nowrap}.result-description{font-size:12px;color:var(--muted);margin:11px 0 23px}.notes{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:8px;margin-bottom:17px}.note-tile{border:1px solid var(--line);border-radius:9px;background:#fcfcf8;min-width:0;padding:13px 3px 10px;text-align:center;color:var(--ink)}.note-tile.root{background:var(--green);border-color:#c7df8b}.note-degree{font-size:10px;color:var(--muted);display:block;margin-bottom:5px}.note-name{font-family:Georgia,serif;font-size:28px;display:block;line-height:1.2}.note-full{font-size:9px;color:var(--muted);display:block;margin-top:5px}.steps{display:flex;justify-content:center;gap:11px;font-size:10px;color:var(--muted);align-items:center;margin:10px 0 20px}.steps b{font-size:11px;letter-spacing:1px;color:var(--ink);font-weight:400}.explanation{padding:14px 17px;border-radius:8px;background:#f3f5ec;font-size:11px;line-height:1.65;margin:13px 0 20px}.explanation strong{font-weight:600}.keyboard-label{display:flex;justify-content:space-between;font-size:8px;letter-spacing:1px;color:var(--muted);margin-bottom:7px}.keyboard{position:relative;display:flex;height:83px;gap:3px;isolation:isolate}.key{background:#fff;border:1px solid #dce1d2;border-radius:0 0 5px 5px;flex:1;display:flex;align-items:flex-end;justify-content:center;font-size:9px;padding-bottom:6px;color:var(--muted);min-width:0}.key.on{background:#e5efcb;border-color:#c9dca4;color:var(--ink)}.key.black{position:absolute;top:0;transform:translateX(-50%);width:5.1%;height:51px;background:#344137;border-color:#344137;z-index:2;color:var(--white);font-size:8px;padding-bottom:5px}.key.black.on{background:var(--purple);border-color:var(--purple)}.player{padding:19px 23px;background:var(--dark);color:white;border-radius:0 0 12px 12px;display:flex;justify-content:space-between;align-items:center;gap:15px}.player-info{display:flex;gap:13px;align-items:center;min-width:0}.sound-icon{display:grid;place-items:center;width:38px;height:38px;background:#405244;border-radius:50%;font-size:27px;color:var(--green);flex:none}.player-info strong{display:block;font-size:13px;font-weight:500}.player-info div>span{font-size:10px;color:#b5c5b7;display:block;margin-top:3px}.player-actions{display:flex;align-items:center;gap:9px;flex:none}.play-button{background:var(--green);color:var(--ink);border:0;border-radius:6px;padding:10px 23px;font-size:12px;font-weight:600}.play-button span{font-size:10px;margin-right:8px}.stop-button{border:1px solid #5e7062;border-radius:6px;padding:9px 12px;color:white;background:transparent;font-size:11px}.stop-button span{margin-left:6px}.volume{font-size:9px;color:#b7c4b8;margin:0 0 0 15px;width:92px}.volume input{display:block;width:100%;accent-color:var(--green);height:13px;margin-top:5px}.notice{font-size:12px;color:var(--purple);margin-top:7px;min-height:18px}.below{display:grid;grid-template-columns:repeat(3,1fr);gap:34px;margin:43px 0 36px}.learn-card{padding-right:24px;border-right:1px solid var(--line)}.learn-card:last-child{border:0;padding-right:0}.section-num{font-size:9px;color:var(--purple);letter-spacing:1.5px;font-weight:700}.learn-card h3{font-size:18px;letter-spacing:-.3px;margin:10px 0}.learn-card p{font-size:12px;color:var(--muted);line-height:1.7}.learn-card .text-button{font-size:11px;margin-top:4px}.learn-card .formula{font-family:Georgia,serif;color:var(--ink);font-size:22px;margin:7px 0}.formula sup{font-size:11px}.guide{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:17px 0;margin-top:20px}.guide summary{font-size:13px;cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between}.guide summary span{font-size:18px;font-weight:400}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;padding:20px 0}.guide-grid h3{font-size:15px}.guide-grid p{font-size:11px;color:var(--muted);line-height:1.7}.references{padding:24px 0 28px}.references .eyebrow{font-size:8px;margin-bottom:7px;color:var(--muted)}.references p{font-size:10px;color:var(--muted);line-height:2}.references a{display:inline-block;margin-left:12px;text-underline-offset:3px}footer{max-width:1224px;padding:22px 36px 32px;margin:auto;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px}footer .brand{font-size:13px}footer .brand-icon{width:28px;height:28px;font-size:21px}footer p{font-size:10px;margin:0;color:var(--muted)}footer p span{font-size:8px}footer>a:last-child{font-size:10px;text-decoration:none}.error{background:#fff1ee;border:1px solid #e6c9c0;border-radius:8px;padding:16px;color:#8d4632;font-size:13px;margin-top:20px}.interval-pair{display:flex;align-items:center;justify-content:center;gap:22px;padding:16px 0}.interval-note{background:var(--sage);border:1px solid var(--line);border-radius:14px;font-family:Georgia,serif;font-size:46px;padding:20px 25px;min-width:108px;text-align:center}.interval-note small{display:block;font-family:Arial,sans-serif;font-size:10px;color:var(--muted);margin-top:4px}.interval-distance{text-align:center;font-size:25px;color:var(--purple)}.interval-distance small{display:block;font-size:9px;color:var(--muted)}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:16px 0}.metric{border:1px solid var(--line);padding:10px 12px;border-radius:7px;font-size:19px}.metric span{display:block;font-size:9px;color:var(--muted)}.chord-notes{grid-template-columns:repeat(4,minmax(0,1fr));margin-top:22px}.chord-notes .note-tile{min-height:88px}.inline-controls{display:flex;gap:8px;margin:10px 0}.inline-controls input{min-width:0;flex:1}.solid-button{border:0;background:var(--dark);color:white;border-radius:6px;padding:9px 15px;font-size:11px}.secondary-button{border:1px solid #ced7c0;background:var(--sage);color:var(--ink);border-radius:6px;padding:8px 12px;font-size:11px}.reverse-area{border-top:1px solid var(--line);padding-top:18px;margin-top:22px}.reverse-area h4{margin:0;font-size:13px;font-weight:500}.candidates{display:flex;flex-wrap:wrap;gap:7px}.candidate{background:var(--lavender);border:1px solid #dacfe1;padding:7px 10px;border-radius:6px;font-size:11px;color:var(--ink)}.progression-input{margin-top:12px}.progression-row{display:flex;flex-wrap:wrap;gap:8px;margin:13px 0}.chord-block{padding:12px 16px;border:1px solid var(--line);background:#f6f8f0;border-radius:8px;font-size:21px;font-family:Georgia,serif}.chord-block span{display:block;font:9px Arial,sans-serif;color:var(--muted);margin-top:5px}.transpose-arrow{font-size:11px;color:var(--purple);margin:14px 0}.transposed .chord-block{background:var(--green);border-color:#c7dd99}.practice-intro{padding:26px 20px;background:var(--sage);border-radius:10px;text-align:center;margin-top:22px}.ear-orb{display:grid;place-items:center;background:var(--green);width:58px;height:58px;border-radius:50%;margin:0 auto 12px;font-family:Georgia,serif;font-size:31px}.practice-intro p{font-size:12px;color:var(--muted);margin:8px 0 18px}.practice-buttons{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.answers{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:18px}.answer{padding:11px 8px;background:white;border:1px solid var(--line);border-radius:6px;font-size:11px;color:var(--ink)}.answer.correct{background:var(--green);border-color:#b7ce7a}.answer.wrong{background:#f5e2dc;border-color:#deafa0}.feedback{font-size:12px;line-height:1.6;min-height:24px;margin-top:12px}.score{font-size:10px;color:var(--muted);margin-top:12px;text-align:center}.skip{position:absolute;left:8px;top:-80px;background:white;padding:8px;z-index:5}.skip:focus{top:8px}.mode-hint{font-size:10px;line-height:1.6;color:var(--muted);margin:0 0 13px}.field-group{margin-bottom:14px}.field-group input{margin-bottom:3px}@media(min-width:1400px){.hero{padding-top:65px;padding-bottom:55px}}@media(max-width:900px){.header{padding:22px 26px}.header-right{gap:17px}main{padding:0 26px}.hero-art{transform:scale(.8);transform-origin:center;max-width:100%}.hero{grid-template-columns:1.2fr 1fr}.hero h1{font-size:54px}.workspace{grid-template-columns:220px 1fr}.controls{padding:23px 20px}.result{padding:24px 20px}.notes{gap:5px}.note-name{font-size:23px}.volume{display:none}.below{gap:22px}.learn-card{padding-right:15px}.guide-grid{grid-template-columns:1fr}.art-caption{letter-spacing:1px}}
@media(max-width:650px){.header{padding:18px 20px}.brand{font-size:15px}.brand-icon{width:31px;height:31px}.private-badge{display:none}.header-right .text-button{font-size:10px;gap:5px}.header-right .text-button span{font-size:14px}main{padding:0 20px}.hero{display:block;padding:35px 0 26px;position:relative;overflow:hidden}.hero h1{font-size:47px;letter-spacing:-2.5px}.hero .eyebrow{font-size:8px;letter-spacing:1.1px;margin-bottom:15px}.hero-copy{font-size:12px;margin-top:17px}.hero-art{display:none}.lab-heading{align-items:flex-start;flex-direction:column;gap:15px;margin:10px 0 17px}.lab-heading h2{font-size:21px}.project-actions{gap:6px;width:100%}.small-button{font-size:10px;padding:7px 10px;flex:1;white-space:nowrap}.tabs{gap:2px;padding:4px;flex-wrap:wrap}.tabs button{font-size:11px;padding:10px 7px;flex:1 0 28%;white-space:nowrap}.tabs button span{font-size:8px;margin-right:3px}.workspace{display:block}.controls{padding:19px 18px;border-right:0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:0 13px;align-items:start}.control-title{grid-column:1/-1;margin-bottom:13px}.controls>label[for=tonic]{grid-column:1;grid-row:2}.controls>.input-note{grid-column:1;grid-row:3}.controls>.input-note input{height:42px;min-height:42px;font-size:21px}.controls>.field-help{grid-column:1/-1;grid-row:4;margin:6px 0 13px;font-size:9px}.controls>label[for=octave]{grid-column:2;grid-row:2}.controls>#octave{grid-column:2;grid-row:3;font-size:10px;margin:0;height:42px;min-width:0;padding:9px 5px}.controls>#mode-controls{grid-column:1/-1}.controls>#mode-controls select{margin-bottom:0}.context-note{display:none}.field-group{margin-bottom:11px}.field-group:last-child{margin-bottom:0}.result{padding:22px 16px}h3{font-size:24px}.result-description{font-size:11px;margin-bottom:18px}.pill{font-size:8px;padding:4px 7px}.notes{gap:4px;margin-bottom:14px}.note-tile{padding:11px 1px 8px;border-radius:6px}.note-degree{font-size:8px}.note-name{font-size:22px}.note-full{font-size:7px}.steps{gap:7px;font-size:8px;flex-wrap:wrap}.steps b{font-size:10px}.explanation{font-size:10px;padding:12px;margin:12px 0 18px}.keyboard{height:77px}.key{font-size:8px;padding-bottom:5px}.key.black{height:46px;font-size:7px}.player{padding:17px 16px;flex-direction:column;align-items:stretch;gap:15px}.player-info strong{font-size:12px}.player-info div>span{font-size:9px}.sound-icon{width:32px;height:32px}.player-actions{justify-content:flex-start}.play-button{flex:1}.stop-button{padding:9px 15px}.volume{display:block;width:62px;margin-left:5px}.below{display:block;margin-top:28px}.learn-card{border:0;border-bottom:1px solid var(--line);padding:0 0 20px;margin-bottom:22px}.learn-card h3{font-size:19px}.learn-card p{font-size:12px}.guide{margin-top:0}.references a{display:block;margin-left:0}.references{padding-bottom:16px}footer{padding:20px;flex-wrap:wrap}footer p{font-size:9px}footer>a:last-child{display:none}.interval-pair{gap:12px}.interval-note{padding:15px 13px;min-width:83px;font-size:37px}.metric{font-size:17px;padding:8px}.metric span{font-size:8px}.chord-notes{grid-template-columns:repeat(4,1fr)}.chord-block{padding:10px 11px;font-size:19px}.practice-intro{padding:20px 12px}.notice{font-size:11px}.mode-hint{margin-bottom:8px}.guide-grid{gap:15px;padding-bottom:10px}}
@media(max-width:350px){main{padding:0 14px}.header{padding:16px 14px}.hero h1{font-size:42px}.brand{font-size:13px}.brand-icon{width:29px;height:29px}.small-button{padding:7px 6px;font-size:9px}.result{padding:20px 12px}.note-name{font-size:19px}.note-full{font-size:6px}.steps{gap:5px}.player{padding:16px 12px}.volume{width:47px}.header-right .text-button{font-size:9px}.notes{gap:3px}.keyboard-label{font-size:7px}.interval-note{min-width:72px;font-size:30px}.interval-distance{font-size:22px}.answers{grid-template-columns:1fr 1fr}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}