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222px)}.treble-progress{position:relative;height:clamp(400px,58vh,570px);aspect-ratio:971/1620;margin-top:-4px}.treble-progress-art{width:100%;height:100%;display:block;overflow:visible}.treble-handwritten-part,.treble-scene-image,.treble-writing-guide{pointer-events:none}.treble-warm-overlay-image{pointer-events:none;transition:opacity .1s ease}.treble-progress.voice-active .treble-warm-overlay-image{filter:saturate(1.04)}.treble-target-note{position:absolute;top:49%;right:7%;color:#315f94;font:500 clamp(25px,3vw,36px)/1 var(--font-utility);letter-spacing:.02em}.treble-feedback-copy{position:absolute;left:50%;bottom:3.5%;min-width:7em;transform:translateX(-50%);color:rgba(49,95,148,.72);font-size:12px;letter-spacing:.13em;text-align:center}.treble-completion-glint{opacity:0;fill:#e3ae3f;stroke:#dc735f;stroke-width:8px;stroke-linecap:round}.treble-progress.feedback-success .treble-progress-art{animation:trebleSuccessFlash .62s ease-out both}.treble-progress.feedback-success .treble-feedback-copy{color:#dc735f}.treble-progress.feedback-success .treble-completion-glint{animation:trebleGlint .62s ease-out both}.treble-progress.feedback-retry .treble-feedback-copy{color:#6f7e79}.treble-progress.feedback-retry .treble-warm-overlay-image{animation:trebleRetryDip .42s ease-out both}.single-note-start{min-width:138px;min-height:44px;margin-top:22px;padding:0 25px;border:0;border-radius:4px;background:#426d9f;color:#fff;cursor:pointer;font-size:15px;letter-spacing:.14em;transition:background .16s ease,transform .16s ease,opacity .16s ease}.single-note-start:hover:not(:disabled){background:#315f94;transform:translateY(-1px)}.single-note-start:disabled{cursor:default;opacity:.8}.single-note-skip{margin-top:13px;padding:3px 2px;border:0;border-bottom:1px solid rgba(49,95,148,.45);background:transparent;color:rgba(49,95,148,.75);cursor:pointer;font-size:11px}.single-note-error{max-width:390px;margin:12px 0 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img{position:absolute;inset:0;width:100%;height:100%;display:block;object-fit:cover;pointer-events:none;-webkit-user-select:none;user-select:none}.melodic-raster-base{z-index:1;object-fit:cover;object-position:center;transition:opacity .1s ease-out}.melodic-ripple-progress.has-piano-cue .melodic-raster-base{opacity:0}.melodic-merged-ripple,.melodic-piano-sequence,.melodic-voice-sequence{position:absolute;z-index:2;inset:0;pointer-events:none}.melodic-piano-sequence{top:0;bottom:0;width:50%}.melodic-piano-sequence.melodic-side-one{right:50%}.melodic-piano-sequence.melodic-side-two{left:50%}.melodic-piano-sequence img{opacity:0;mix-blend-mode:multiply;object-fit:contain;object-position:center}.melodic-merged-ripple img{object-fit:cover;object-position:center;mix-blend-mode:multiply}.melodic-ripple-progress.has-piano-cue .melodic-piano-sequence img{animation:melodicRasterFrame var(--raster-frame-duration) ease-out var(--raster-frame-delay) both}.melodic-ripple-progress.has-piano-cue .melodic-piano-sequence img.is-last-frame{animation-name:melodicRasterLastFrame}.melodic-ripple-progress.has-piano-cue .melodic-piano-sequence{animation:melodicPianoExit 1ms linear var(--piano-exit-delay) both}.melodic-merged-ripple{z-index:3;opacity:0}.melodic-ripple-progress.has-piano-cue .melodic-merged-ripple{animation:melodicMergedRipple .18s ease-out var(--interference-delay) both}.melodic-side-two img{transform:scaleX(-1)}.melodic-voice-drop{position:absolute;z-index:4;top:54%;width:34px;height:72px;opacity:0;pointer-events:none;transform:translate(-50%,var(--melodic-drop-y,64px));transition:transform 90ms linear,opacity 90ms linear}.melodic-voice-drop-one{left:28.5%}.melodic-voice-drop-two{left:71.5%}.melodic-voice-drop img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply}.melodic-voice-drop.is-visible{opacity:var(--melodic-drop-opacity,1)}.melodic-voice-drop.is-visible img{animation:melodicVoiceDropBreathe .42s ease-in-out infinite alternate}.melodic-voice-sequence{--melodic-voice-radius:0%;--melodic-voice-center-x:28.5%;z-index:4;opacity:0;overflow:hidden;transition:opacity .12s ease-out}.melodic-voice-one{clip-path:inset(0 50% 0 0)}.melodic-voice-two{--melodic-voice-center-x:71.5%;clip-path:inset(0 0 0 50%)}.melodic-voice-sequence.is-visible{opacity:1}.melodic-voice-sequence img{opacity:1;object-fit:cover;object-position:center;mix-blend-mode:multiply;clip-path:ellipse(calc(var(--melodic-voice-radius) * .25) calc(var(--melodic-voice-radius) * .29) at var(--melodic-voice-center-x) 54%);transition:clip-path .15s linear}.melodic-ripple-progress figcaption{min-height:1.6em;margin-top:-4px;color:rgba(49,95,148,.68);font-size:12px;letter-spacing:.12em}.melodic-start{margin-top:2px;min-width:190px;min-height:46px;padding:0 24px;border:0;border-radius:7px;background:#426d9f;color:white;cursor:pointer;font-size:14px;letter-spacing:.12em;box-shadow:0 9px 21px rgba(50,86,129,.15);transition:background .16s ease,transform .16s ease,opacity .16s ease}.melodic-start:hover:not(:disabled){background:#315f94;transform:translateY(-1px)}.melodic-start:disabled{cursor:default;opacity:.76}.melodic-skip{margin-top:11px;padding:3px 1px;border:0;border-bottom:1px solid rgba(49,95,148,.4);background:transparent;color:rgba(49,95,148,.75);cursor:pointer;font-size:11px}.melodic-error{max-width:560px;margin:10px auto 0;color:#8c5148;font-size:11px;line-height:1.6;text-align:center}.harmonic-page{width:min(1040px,100%);min-height:calc(100vh - 92px);margin:0 auto;padding:12px 0 48px;color:#315f94}.harmonic-header{display:grid;gap:7px}.harmonic-title-line{display:flex;align-items:center;gap:11px}.harmonic-title-line>p{margin:0 4px 0 0;color:#b77c24;font-size:11px;letter-spacing:.16em}.harmonic-header h1{margin:0;color:#315f94;font-size:clamp(29px,3.2vw,40px);font-weight:600;letter-spacing:.08em}.harmonic-header>p{margin:0;color:#2b6c5a;font-size:14px;letter-spacing:.055em}.harmonic-help{position:relative}.harmonic-help summary{width:25px;height:25px;display:grid;place-items:center;border:1px solid rgba(49,95,148,.32);border-radius:50%;background:rgba(249,244,235,.72);color:#315f94;cursor:pointer;font:700 12px/1 var(--font-display);list-style:none}.harmonic-help summary::-webkit-details-marker{display:none}.harmonic-help>div{position:absolute;z-index:20;top:35px;left:0;width:320px;padding:15px 17px;border:1px solid rgba(49,95,148,.22);background:rgba(249,244,235,.98);box-shadow:0 16px 36px rgba(73,57,38,.14);color:#496170;font-size:12px;line-height:1.7}.harmonic-help p{margin:0}.harmonic-help p+p{margin-top:7px}.harmonic-offer-visual,.harmonic-stage{display:grid;justify-items:center;align-items:center}.harmonic-stage{grid-template-rows:auto auto auto auto;gap:14px;padding-top:14px}.harmonic-offer-visual{margin-top:10px}.harmonic-difficulty{display:inline-grid;grid-template-columns:auto auto;align-items:baseline;gap:9px;color:#496170;font-size:11px;letter-spacing:.08em}.harmonic-difficulty strong{color:#315f94;font-size:17px;font-weight:500;letter-spacing:.04em}.harmonic-ripple-progress{width:min(520px,78vw);margin:0;display:grid;justify-items:center}.harmonic-raster-stage{--harmonic-piano-radius:0%;position:relative;isolation:isolate;width:100%;aspect-ratio:4/3;overflow:hidden;background:transparent}.harmonic-raster-stage img{position:absolute;inset:0;width:100%;height:100%;display:block;object-fit:contain;object-position:center;pointer-events:none;-webkit-user-select:none;user-select:none}.harmonic-raster-base{z-index:1;opacity:1;transition:opacity .12s ease-out}.harmonic-piano-warm{position:absolute;inset:0;pointer-events:none;z-index:2;opacity:0;transition:opacity .12s ease-out}.harmonic-piano-warm-low{clip-path:ellipse(calc(var(--harmonic-piano-radius) * .58) calc(var(--harmonic-piano-radius) * .47) at 48.2% 56%)}.harmonic-piano-warm-high{clip-path:ellipse(calc(var(--harmonic-piano-radius) * .4) calc(var(--harmonic-piano-radius) * .33) at 66.7% 27.8%)}.harmonic-ripple-progress.has-piano-cue .harmonic-piano-warm{animation:harmonicPianoWarmReveal .82s cubic-bezier(.2,.72,.28,1) var(--harmonic-impact-delay) both}.harmonic-ripple-progress.has-piano-cue.phase-analyzing .harmonic-piano-warm,.harmonic-ripple-progress.has-piano-cue.phase-recording .harmonic-piano-warm{--harmonic-piano-radius:100%;opacity:1;animation:none}.harmonic-ripple-progress.has-piano-cue.phase-analyzing .harmonic-piano-warm-low,.harmonic-ripple-progress.has-piano-cue.phase-recording .harmonic-piano-warm-low{clip-path:inset(40% 0 0 0);-webkit-mask-image:radial-gradient(ellipse calc(var(--harmonic-low-return-radius) * .58) calc(var(--harmonic-low-return-radius) * .47) at 48.2% 56%,transparent 88%,#000 100%);mask-image:radial-gradient(ellipse calc(var(--harmonic-low-return-radius) * .58) calc(var(--harmonic-low-return-radius) * .47) at 48.2% 56%,transparent 88%,#000 100%)}.harmonic-ripple-progress.has-piano-cue.phase-analyzing .harmonic-piano-warm-high,.harmonic-ripple-progress.has-piano-cue.phase-recording .harmonic-piano-warm-high{clip-path:inset(0 0 60% 0);-webkit-mask-image:radial-gradient(ellipse calc(var(--harmonic-high-return-radius) * .4) calc(var(--harmonic-high-return-radius) * .33) at 66.7% 27.8%,transparent 88%,#000 100%);mask-image:radial-gradient(ellipse calc(var(--harmonic-high-return-radius) * .4) calc(var(--harmonic-high-return-radius) * .33) at 66.7% 27.8%,transparent 88%,#000 100%)}.harmonic-piano-drop,.harmonic-voice-drop{position:absolute;z-index:5;width:38px;height:68px;opacity:0;pointer-events:none}.harmonic-piano-drop{top:0}.harmonic-piano-drop-low{left:48.2%;top:56%}.harmonic-piano-drop-high{left:66.7%;top:27.8%}.harmonic-piano-drop img,.harmonic-voice-drop img{width:100%;height:100%;object-fit:contain}.harmonic-ripple-progress.has-piano-cue .harmonic-piano-drop{animation:harmonicPianoDrop var(--harmonic-drop-duration) cubic-bezier(.24,.72,.28,1) both}.harmonic-voice-drop{transform:translate(-50%,var(--harmonic-voice-drop-y,118px)) rotate(180deg);transition:transform 90ms linear,opacity 90ms linear}.harmonic-voice-drop-low{left:48.2%;top:56%}.harmonic-voice-drop-high{left:66.7%;top:27.8%}.harmonic-voice-drop.is-visible{opacity:var(--harmonic-voice-drop-opacity,1)}.harmonic-voice-drop.is-visible img{animation:harmonicVoiceDropBreathe .42s ease-in-out infinite alternate}.harmonic-ripple-progress.has-piano-cue.is-voice-complete .harmonic-piano-warm{opacity:0;animation:none}.harmonic-ripple-progress.is-voice-complete .harmonic-raster-base{opacity:1}.harmonic-ripple-progress figcaption{min-height:1.6em;margin-top:5px;color:rgba(49,95,148,.68);font-size:12px;letter-spacing:.12em}.harmonic-primary{margin-top:8px;min-width:190px;min-height:46px;padding:0 24px;border:0;border-radius:7px;background:#426d9f;box-shadow:0 9px 21px rgba(50,86,129,.15);color:white;cursor:pointer;font-size:14px;letter-spacing:.12em;transition:background .16s ease,transform .16s ease,opacity .16s ease}.harmonic-primary:hover:not(:disabled){background:#315f94;transform:translateY(-1px)}.harmonic-primary:disabled{cursor:default;opacity:.76}.harmonic-secondary{padding:3px 1px;border:0;border-bottom:1px solid rgba(49,95,148,.4);background:transparent;color:rgba(49,95,148,.75);cursor:pointer;font-size:11px}.harmonic-offer-actions{display:flex;justify-content:center;align-items:center;gap:22px;margin-top:24px}@property --harmonic-piano-radius{syntax:"<percentage>";inherits:true;initial-value:0}@keyframes harmonicPianoDrop{0%{opacity:0;transform:translate(-50%,-245%) scale(.72,.92)}10%{opacity:1}76%{opacity:1;transform:translate(-50%,-82%) scale(.94,1.03)}96%{opacity:1;transform:translate(-50%,-28%) scale(1.06,.9)}to{opacity:0;transform:translate(-50%,-18%) scale(1.18,.66)}}@keyframes harmonicPianoWarmReveal{0%{--harmonic-piano-radius:0%;opacity:0}8%{opacity:1}to{--harmonic-piano-radius:100%;opacity:1}}@keyframes harmonicVoiceDropBreathe{0%{scale:.92 1.05}to{scale:1.06 .94}}.interval-summary strong{margin:4px 0;font-family:var(--font-display);font-size:36px}.two-note-path{width:230px;display:flex;justify-content:space-between;align-items:center;margin:26px 0 0}.two-note-path i{width:36px;height:36px;border:2px solid var(--green);background:var(--green-soft)}.two-note-path b{color:var(--accent);font-size:24px}.two-note-path.down{transform:rotate(6deg)}.two-note-path.up{transform:rotate(-6deg)}.two-note-progress{width:min(430px,100%);display:grid;grid-template-columns:1fr 46px 1fr;align-items:center;gap:10px;margin:22px 0 16px}.two-note-progress>div{display:grid;justify-items:center;gap:6px;color:var(--ink-soft)}.two-note-progress>div b{width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--line-dark);background:var(--sheet)}.two-note-progress>div span{font-size:10px}.two-note-progress>div.active b{border-color:var(--accent);color:var(--accent)}.two-note-progress>div.complete b{border-color:var(--green);background:var(--green);color:white}.two-note-progress>i{height:1px;background:var(--line-dark)}.two-note-progress>p{grid-column:1/-1;margin:4px 0 0;color:var(--ink-soft);font-size:11px;text-align:center}.two-note-progress.voice-active>p{color:var(--accent)}.choice-page{width:min(780px,100%);margin:48px auto 78px;padding:38px 42px 42px;border:1px solid var(--line);border-top:4px solid var(--ink);background:var(--sheet);text-align:left}.challenge-mark{width:48px;height:48px;display:grid;place-items:center;margin-bottom:22px;border:1px solid var(--ink);color:var(--ink)}.challenge-mark span{font-family:var(--font-display);font-size:20px;font-weight:400}.separation-mark{border-color:var(--accent);color:var(--accent)}.choice-page h1{margin-bottom:14px;font-size:clamp(30px,5vw,44px)}.choice-copy{max-width:680px;margin-bottom:22px;color:var(--ink-soft);line-height:1.8}.choice-facts{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--ink);border-bottom:1px solid var(--line)}.choice-facts span{min-height:74px;padding:13px 12px;border-right:1px solid var(--line);color:var(--ink-soft);font-size:10px}.choice-facts span:last-child{border-right:0}.choice-facts b{display:block;margin-bottom:4px;color:var(--ink);font-size:13px}.choice-actions{display:flex;gap:10px;margin-top:26px}.chord-visual{width:190px;height:76px;position:relative;margin-top:24px}.chord-visual i{width:44px;height:44px;position:absolute;top:20px;border:2px solid var(--green);background:var(--green-soft)}.chord-visual i:first-child{left:38px}.chord-visual i:nth-child(2){right:38px;top:0}.chord-visual span{position:absolute;left:50%;bottom:0;transform:translateX(-50%);color:var(--accent);font-size:10px}.melody-imitation-page{width:min(1040px,100%);min-height:calc(100vh - 92px);margin:0 auto;padding:12px 0 54px;color:#315f94}.melody-imitation-header{display:grid;gap:7px}.melody-imitation-title-line{display:flex;align-items:center;gap:11px}.melody-imitation-header h1{margin:0;color:#315f94;font-size:clamp(29px,3.2vw,40px);font-weight:600;letter-spacing:.08em}.melody-imitation-header>p{max-width:760px;margin:0;color:#2b6c5a;font-size:13px;letter-spacing:.035em}.melody-imitation-header>p span{letter-spacing:.01em}.melody-imitation-help{position:relative}.melody-imitation-help summary{width:25px;height:25px;display:grid;place-items:center;border:1px solid rgba(49,95,148,.32);border-radius:50%;background:rgba(249,244,235,.72);color:#315f94;cursor:pointer;font:700 12px/1 var(--font-display);list-style:none}.melody-imitation-help summary::-webkit-details-marker{display:none}.melody-imitation-help>div{position:absolute;z-index:20;top:35px;left:0;width:min(350px,78vw);padding:15px 17px;border:1px solid rgba(49,95,148,.22);background:rgba(249,244,235,.98);box-shadow:0 16px 36px rgba(73,57,38,.14);color:#496170;font-size:12px;line-height:1.7}.melody-imitation-help p{margin:0}.melody-imitation-help p+p{margin-top:7px}.melody-imitation-stage{min-height:520px;display:grid;grid-template-rows:minmax(350px,auto) auto auto;justify-items:center;align-content:start;gap:18px;padding-top:14px}.melody-imitation-visual-swap{width:min(800px,100%);min-height:390px;display:grid}.melody-visual-panel{grid-area:1/1;opacity:0;transform:translateY(5px) scale(.997);pointer-events:none;transition:opacity .56s ease,transform .56s ease;will-change:opacity,transform}.melody-visual-panel.is-active{z-index:1;opacity:1;transform:translateY(0) 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