:root{color-scheme:light;--ink:#183840;--muted:#597077;--accent:#0b716f;--accent-dark:#075857;--line:#cdd9d5;--wash:#f1f6f3;--paper:#fffefb;--focus:#c26433;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--wash);color:var(--ink);line-height:1.5}button,input,select{font:inherit}button,select{cursor:pointer}button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--focus);outline-offset:3px}button:disabled{opacity:.4;cursor:not-allowed}.skip{position:absolute;left:-999px;top:10px;background:#fff;padding:10px;z-index:10}.skip:focus{left:10px}.site-header{max-width:1120px;margin:auto;padding:25px 26px;display:flex;justify-content:space-between;align-items:center;gap:16px}.brand{display:flex;align-items:center;gap:13px}.brand-mark{border:2px solid var(--ink);width:45px;height:45px;display:grid;place-items:center;border-radius:50%;font-size:30px;line-height:1}.brand strong{display:block;font-size:1.1rem;letter-spacing:-.03em}.brand span:not(.brand-mark){display:block;color:var(--muted);font-size:.78rem}.prototype-label{font-size:.68rem;letter-spacing:.13em;font-weight:800;background:#dce9e4;color:#255149;padding:7px 12px;border-radius:100px}main{max-width:1120px;margin:auto;padding:0 26px 55px}.hero{padding:44px 0 41px}.eyebrow{font-size:.74rem;font-weight:800;color:var(--accent);letter-spacing:.18em;margin:0 0 12px}.hero h1{font-size:clamp(2.6rem,6vw,4.9rem);line-height:1.06;letter-spacing:-.06em;margin:0 0 17px}.hero em{font-style:normal;color:var(--accent)}.hero>p:last-child{max-width:590px;color:var(--muted);font-size:1rem;margin:0}.practice-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:22px}.panel{border:1px solid var(--line);border-radius:20px;background:var(--paper);padding:30px;box-shadow:0 12px 30px rgba(10,44,45,.045);min-width:0}.panel-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:15px}.panel h2{font-size:1.5rem;letter-spacing:-.03em;margin:0}.tag{font-size:.65rem;font-weight:800;letter-spacing:.1em;color:var(--accent)}.tempo-value{display:flex;align-items:baseline;gap:10px;margin:22px 0 9px}.tempo-value output{font-variant-numeric:tabular-nums;font-size:5.4rem;line-height:1;font-weight:750;letter-spacing:-.075em}.tempo-value span{font-size:.8rem;font-weight:700;color:var(--muted)}.field-label{display:block;font-size:.85rem;font-weight:700;margin-bottom:9px}.tempo-controls{display:flex;gap:10px;margin-bottom:24px}.tempo-controls input{flex:1;width:70px;text-align:center;padding:11px;border-radius:11px;border:1px solid var(--line);background:var(--wash);font-weight:700}.square{width:48px;border:1px solid var(--line);border-radius:10px;background:#f4f8f5;font-size:1.6rem}.section-row{display:flex;align-items:center;justify-content:space-between;gap:16px}.section-row .field-label{margin-bottom:0}.section-row select,.note-select{border:1px solid var(--line);border-radius:10px;background:#f4f8f5;color:var(--ink);padding:12px;font-weight:650}.section-row select{min-width:115px}.beat-dots{display:flex;align-items:center;justify-content:center;gap:14px;padding:24px 0 27px;min-height:84px}.beat-dot{width:18px;height:18px;background:#d6e4de;border:2px solid #9db9af;border-radius:50%;transition:background .075s,transform .075s}.beat-dot.first{border-color:var(--accent)}.beat-dot.active{background:var(--accent);transform:scale(1.28)}.primary{width:100%;border:0;border-radius:12px;padding:16px 17px;background:var(--accent);color:#fff;font-weight:800;letter-spacing:.005em;display:flex;align-items:center;justify-content:center;gap:9px}.primary:hover{background:var(--accent-dark)}.primary[aria-pressed=true]{background:#28464e}.tap-row{display:flex;gap:13px;align-items:center;margin-top:12px}.secondary{border:1px solid var(--line);border-radius:11px;background:#fff;padding:11px 16px;font-size:.88rem;color:var(--ink);font-weight:750;white-space:nowrap}.secondary:hover{background:var(--wash)}kbd{font-size:.65rem;background:#e8efeb;padding:3px 5px;border-radius:4px;margin-left:6px}.help{font-size:.77rem;color:var(--muted);line-height:1.3}.volume-row{display:grid;grid-template-columns:105px minmax(40px,1fr) 41px;gap:10px;align-items:center;margin-top:21px}.volume-row label,.volume-row output{font-size:.76rem;font-weight:700;color:var(--muted)}.volume-row input{accent-color:var(--accent);width:100%}.volume-row output{text-align:right}.hint{font-size:.74rem;color:var(--muted);margin:20px 0 0}.panel-description{color:var(--muted);font-size:.94rem;margin:28px 0 35px;max-width:340px}.note-select{width:100%;font-size:1.1rem;padding:15px;margin-bottom:4px}.frequency{display:flex;align-items:baseline;gap:7px;color:var(--ink);margin:10px 0 30px}.frequency output{font-size:1.7rem;font-variant-numeric:tabular-nums;font-weight:750}.frequency span{font-size:.77rem;color:var(--muted)}.drone-button{margin-bottom:6px}.info-strip{padding:15px 17px;margin-top:28px;border-left:3px solid var(--accent);background:var(--wash);border-radius:0 8px 8px 0}.info-strip strong{font-size:.85rem}.info-strip p{font-size:.77rem;margin:6px 0 0;color:var(--muted)}.app-status{border:1px solid #c5dcd5;background:#e8f4ee;border-radius:10px;padding:13px 17px;font-size:.83rem;color:#20544a;margin:20px 0 0}footer{max-width:1120px;margin:auto;padding:22px 26px 34px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:18px;color:var(--muted);font-size:.76rem}@media(max-width:800px){.practice-grid{grid-template-columns:1fr}.hero{padding:30px 0}.site-header{padding:18px}.panel{padding:23px}main{padding:0 18px 35px}footer{padding:22px 18px;flex-wrap:wrap}}@media(max-width:460px){.prototype-label{display:none}.tempo-value output{font-size:4.6rem}.tap-row{align-items:flex-start;flex-direction:column}.volume-row{grid-template-columns:96px 1fr 38px;gap:7px}.panel-top h2{font-size:1.3rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
/* Hidden panels must stay hidden even when layout rules set display:flex/grid. */
[hidden]{display:none!important}
/* V2 learning and harmony expansions */
a{color:var(--accent)}.brand{text-decoration:none;color:inherit}.brand small{display:block;color:var(--muted);font-size:.78rem}.quick-nav{display:flex;flex-wrap:wrap;gap:8px;margin-top:25px}.quick-nav a{border:1px solid var(--line);border-radius:100px;padding:7px 13px;text-decoration:none;background:var(--paper);font-size:.8rem;font-weight:750}.quick-nav a:hover{background:#dce9e4}.form-row{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:12px 0}.form-row label{font-weight:700;font-size:.84rem}.form-row select{width:min(57%,275px);min-width:110px;border:1px solid var(--line);border-radius:9px;background:var(--wash);color:var(--ink);padding:10px 9px;font-weight:650}.beat-dots{flex-wrap:wrap;gap:9px;padding:14px 0 20px}.beat-dot{width:14px;height:14px;flex:0 0 14px}.beat-dot.group{border-color:#c78b55;background:#f4dcc7}.beat-dot.strong{border-color:#0b716f}.beat-dot.bar-break{margin-left:17px}.beat-dot.active.group{background:#c4773f}.beat-dot.active.strong{background:#0b716f}.drone-panel .panel-description{margin:0 0 16px;max-width:none}.drone-panel .note-select{margin-bottom:0}.drone-panel .frequency{margin:7px 0 20px}.voice-readout{margin:18px 0;padding:11px 13px;border:1px dashed #b6c9c1;border-radius:9px;background:var(--wash);display:grid;gap:4px}.readout-label{font-size:.74rem;color:var(--muted)}.voice-readout strong{font-variant-numeric:tabular-nums;letter-spacing:.03em}.drone-panel .hint{margin-top:10px}.learning-zone{padding:54px 0 0}.section-intro{margin-bottom:25px}.section-intro h2{font-size:clamp(1.8rem,3.5vw,2.7rem);margin:0 0 10px;letter-spacing:-.035em}.section-intro>p:last-child{color:var(--muted);margin:0;max-width:630px}.learn-grid{display:grid;grid-template-columns:1.25fr .85fr;gap:20px}.learn-grid .panel{padding:25px}.staff-frame{margin:20px 0 12px;border-radius:14px;background:#fdfdfb;border:1px solid var(--line);padding:7px}.staff-frame svg{display:block;width:100%;height:auto;max-height:220px}.answer-buttons{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:7px;margin:13px 0}.answer-buttons button{border:1px solid var(--line);border-radius:9px;background:var(--wash);color:var(--ink);font-size:1.1rem;font-weight:800;padding:13px 2px;cursor:pointer}.answer-buttons button:hover{background:#dbece4}.answer-buttons button:disabled{cursor:default}.answer-buttons button.correct{background:#d4eee1;border-color:#138065}.answer-buttons button.wrong{background:#f7e1d7;border-color:#cb7353}.quiz-actions{display:flex;flex-wrap:wrap;gap:7px}.quiz-actions button{white-space:normal}.feedback{min-height:24px;font-size:.89rem;font-weight:700}.memory-panel h3{margin:0 0 18px}.memory-table{display:grid;gap:6px}.memory-table p{margin:0;padding:9px 0;border-bottom:1px solid var(--line);display:grid;gap:3px}.memory-table strong{font-size:.79rem}.memory-table span{font-weight:850;letter-spacing:.12em;color:var(--accent)}.memory-table em{font-style:normal;font-size:.85rem}.learning-source{font-size:.8rem;color:var(--muted)}.basics-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.basics-card{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:20px}.basics-card>span{color:var(--accent);font-size:.72rem;font-weight:850}.basics-card h3{margin:10px 0 7px;font-size:1.04rem}.basics-card p{font-size:.86rem;color:var(--muted);margin:0}.learn-grid [hidden]{display:none!important}
@media(max-width:860px){.learn-grid{grid-template-columns:1fr}.basics-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:520px){.basics-grid{grid-template-columns:1fr}.form-row{flex-wrap:wrap}.form-row select{min-width:100%;width:100%}.answer-buttons{gap:4px}.answer-buttons button{padding:10px 0}.learning-zone{padding-top:37px}}

/* Public launch identity: approved square-bordered waveform logomark. */
.site-header .brand{display:inline-flex;align-items:center;flex:0 1 auto;max-width:74%;min-width:0}
.site-header .brand-logo{display:block;width:clamp(180px,25vw,244px);height:auto;max-width:100%;object-fit:contain}
.site-header .brand:hover{opacity:.84}
footer a{color:var(--accent);text-underline-offset:3px}
@media(max-width:460px){.site-header .brand{max-width:100%}.site-header .brand-logo{width:min(230px,65vw)}}

.privacy-document{max-width:790px;margin:36px auto 75px}.privacy-document h1{font-size:clamp(2rem,5vw,3.2rem);line-height:1.12}.privacy-document h2{font-size:1.3rem;margin:25px 0 7px}.privacy-document p{font-size:.96rem;color:var(--muted);line-height:1.65}.privacy-document a{font-weight:650}