@charset "UTF-8";
:root{--ink:#20201e;--muted:#777772;--paper:#fff;--wash:#f3f2ee;--line:#d7d6d0;--red:#e16d53;--blue:#5b83bc;--yellow:#e8b953;--mint:#95b7a4;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"PingFang HK","Microsoft JhengHei",monospace;--sans:"Helvetica Neue","PingFang HK","Noto Sans TC",Arial,sans-serif;--ease:cubic-bezier(.16,1,.3,1)}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font-family:var(--mono);font-size:13px;line-height:1.7}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button{background:transparent;border:0}button:disabled{cursor:default;opacity:.35}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:4px}button{transition:transform .2s var(--ease),background .18s,color .18s,box-shadow .18s}button:hover:not(:disabled){transform:translateY(-2px)}button:active:not(:disabled){transform:translate(1px,2px) rotate(-.4deg)}[hidden]{display:none!important}h1,h2,h3,p{margin:0}button.primary{color:white;background:var(--ink);border-color:var(--ink)}button.primary:hover{background:#3c3c38;box-shadow:3px 3px 0 #b8b8ae}button.primary:disabled{box-shadow:none}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.skip-link{position:fixed;top:-80px;left:20px;background:white;z-index:100;padding:10px}.skip-link:focus{top:10px}
.topbar{height:86px;border-bottom:1.5px solid var(--ink);display:flex;align-items:center;gap:40px;padding:0 32px;background:#fff;position:relative;z-index:10}.brand{display:flex;gap:16px;align-items:center;white-space:nowrap}.brand>strong{font-family:Georgia,serif;font-size:44px;line-height:1;letter-spacing:-3px;position:relative}.brand-dot{position:absolute;top:-6px;right:-4px;font-size:9px}.brand>span{font-weight:650;letter-spacing:2px;font-size:15px;line-height:1.5}.brand small{display:block;font-size:8px;letter-spacing:1.2px;font-weight:400}.main-nav{display:flex;border:1px solid var(--ink);border-radius:30px;padding:5px;gap:3px;margin:auto}.nav-button{padding:10px 23px;border-radius:24px;font-size:13px}.nav-button span{margin-left:5px;font-size:10px}.nav-button.active{background:var(--ink);color:white}.settings-button{display:flex;gap:9px;align-items:center;padding:10px 17px;border:1px solid var(--ink);border-radius:30px}.settings-button>span{font-size:20px;line-height:1}.app-shell{display:grid;grid-template-columns:203px minmax(0,1fr);min-height:calc(100vh - 86px)}.sidebar{border-right:1px solid var(--ink);padding:32px 19px 20px;position:relative;overflow:hidden;display:flex;flex-direction:column}.side-heading{font-size:15px;letter-spacing:2px;line-height:1.5;margin:4px 9px 24px}.side-heading small{display:block;font-size:8px;letter-spacing:1px;color:var(--muted);margin-top:7px}.lesson-list{display:flex;flex-direction:column;gap:7px;z-index:1}.lesson-item{display:flex;align-items:flex-start;gap:15px;text-align:left;padding:17px 13px;border-radius:3px 7px 4px 5px;border-bottom:1px solid var(--line);width:100%;line-height:1.5}.lesson-item.active{color:white;background:var(--ink);box-shadow:2px 2px 0 #b8b8ae;transform:rotate(-.6deg)}.lesson-item>span{font-size:15px}.lesson-item b{font-size:13px;display:block;font-weight:500}.lesson-item small{font-size:8px;letter-spacing:.6px;opacity:.65}.side-note{text-align:left;font-size:10px;margin:24px 6px 0}.sidebar-art{min-height:210px;flex:1;background:url('assets/studio.png') 8% center/auto 290px no-repeat;mix-blend-mode:multiply;margin:20px -55px 0 -20px;mask-image:linear-gradient(transparent,#000 12%,#000 85%,transparent)}.sidebar-bottom{margin-top:auto;font-size:10px;padding:15px 3px;position:relative;background:white}.sidebar-bottom small{display:block;font-size:8px;letter-spacing:.7px;margin:7px 0 0 11px}.ink-dot{display:inline-block;width:5px;height:5px;background:var(--ink);border-radius:50%;margin-right:4px}#workspace{min-width:0;padding:0 30px;outline:none}.welcome{height:174px;position:relative;display:flex;align-items:center;overflow:hidden}.welcome-copy{z-index:1;background:linear-gradient(90deg,#fff 92%,transparent);padding-right:35px}.welcome h1{font-family:var(--sans);font-size:clamp(26px,3vw,43px);letter-spacing:-1.8px;line-height:1.35;font-weight:750}.hand-period{display:inline-block;transform:rotate(-10deg)}.welcome p{font-size:12px;margin-top:13px;letter-spacing:2px}.studio-art{position:absolute;right:-35px;top:-10px;width:47%;height:196px;object-fit:cover;object-position:center;mix-blend-mode:multiply;mask-image:linear-gradient(90deg,transparent,#000 20%)}.small-break{display:none}.classroom-grid{display:grid;grid-template-columns:minmax(0,1fr) 285px;gap:16px;align-items:stretch}.ink-panel{border:1.5px solid var(--ink);border-radius:5px 9px 4px 7px;position:relative;background:#fff}.teaching-panel{box-shadow:2px 3px 0 var(--ink);display:flex;flex-direction:column;min-height:454px;overflow:hidden}.panel-toolbar{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:13px 20px;font-size:11px;min-height:53px}.slide-controls{display:flex;align-items:center;gap:12px}.slide-controls>span{color:var(--muted);font-size:9px}.slide-controls button{font-size:20px;width:24px;height:26px;line-height:1}.canvas{padding:25px 27px 12px;text-align:center;flex:1;min-height:268px;position:relative}.canvas.scene-enter{animation:panelIn .45s var(--ease) both}.canvas h2{font-family:var(--sans);font-weight:650;letter-spacing:1px;font-size:27px;line-height:1.5}.canvas .canvas-description{font-size:11px;color:#777772;margin-top:7px;line-height:1.8}.staff{width:100%;height:166px;display:block;overflow:visible;margin:1px auto}.notehead{filter:url(#ink-texture);cursor:pointer;transition:transform .2s}.staff-note.playing{opacity:.5}.note-label{font-size:19px;font-family:var(--mono);font-weight:500}.canvas-caption{font-size:12px;letter-spacing:2px;display:inline-block;padding:3px 12px;border-bottom:1px solid var(--yellow);transform:rotate(-1deg)}.lesson-actionbar{padding:8px 23px 17px;display:flex;justify-content:center;align-items:center;gap:10px;flex-wrap:wrap}.button{border:1px solid var(--ink);border-radius:4px 7px 4px 5px;padding:9px 15px;line-height:1.6;font-size:11px;white-space:nowrap}.primary{box-shadow:2px 2px 0 #aaa99e}.text-button{font-size:10px;color:var(--muted);padding:8px}.feedback{display:none;margin:0 20px 15px;padding:9px 12px;font-size:11px;background:#f3f2ee;text-align:center;border-left:2px solid var(--ink)}.feedback:not(:empty){display:block}.feedback.success{border-color:#638f76;background:#eff5ee}.feedback.error{border-color:var(--red);background:#fff3ef}.feedback button{text-decoration:underline;font-weight:600}.teacher-panel{padding:13px 15px 9px;display:flex;flex-direction:column}.teacher-label{font-size:11px;display:flex;justify-content:space-between;align-items:center}.teacher-label span{font-size:7px;color:var(--muted);letter-spacing:.6px}.portrait-wrap{height:128px;overflow:hidden;position:relative;margin:0 -8px}.teacher-portrait{width:100%;height:185px;object-fit:cover;object-position:50% 35%;margin-top:-24px;mix-blend-mode:multiply}.floating-note{position:absolute;font-size:20px;animation:float 4s ease-in-out infinite}.note-one{top:25px;left:24px;transform:rotate(-18deg)}.note-two{top:54px;right:20px;animation-delay:-1.5s}.teacher-name{display:flex;align-items:baseline;gap:10px;padding:3px 0 8px}.teacher-name h2{font-family:Georgia,serif;font-size:27px;font-weight:600}.teacher-name h2 span{font-family:var(--mono);font-size:9px;margin-left:6px}.teacher-name>span{font-size:8px;color:var(--muted)}.teacher-transcript{font-size:11px;line-height:1.85;padding:12px 13px;background:var(--wash);border-radius:1px 12px 12px 12px;min-height:95px;max-height:164px;overflow:auto;flex:1;white-space:pre-wrap}.teacher-tools{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;margin:10px 0}.teacher-tools button{font-size:9px;border:1px solid #aaa99e;border-radius:4px;padding:5px 2px;white-space:nowrap}#question-form{display:flex;gap:5px}#question{min-width:0;width:100%;font-size:10px;border:1px solid #aaa99e;border-radius:4px;padding:9px;background:white}#question-form button{background:var(--ink);color:#fff;font-size:21px;border-radius:4px;min-width:36px}.teacher-footnote{font-size:7.5px;line-height:1.5;color:var(--muted);margin-top:7px;text-align:center}.piano-section{padding:20px 3px 0}.piano-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:14px}.piano-toolbar h2{font-size:15px;letter-spacing:1px;white-space:nowrap}.piano-toolbar h2 span{font-size:8px;margin-left:13px;font-weight:400;color:var(--muted)}.piano-tools{display:flex;gap:12px;align-items:center}.pill{border:1px solid #8f8e87;border-radius:30px;padding:4px 11px;font-size:9px}.pill[aria-pressed=true]{background:var(--ink);color:white}.tempo-label{font-size:10px;white-space:nowrap}.tempo-label input{width:42px;border:0;border-bottom:1px solid var(--line);padding:2px;font-size:11px}.volume-label{display:flex;align-items:center;gap:8px}.volume-label input{width:95px;accent-color:var(--ink);height:3px}.piano-scroll{overflow-x:auto;padding:0 3px 7px}.piano{height:137px;position:relative;display:flex;border:2px solid var(--ink);border-radius:5px 5px 6px 6px;padding:3px 3px 6px;background:var(--ink);box-shadow:0 4px 0 #aaa99e;min-width:660px;touch-action:none}.piano-key{position:relative;border:1px solid #46463f;border-radius:1px 2px 5px 5px;flex:1;background:linear-gradient(99deg,#e9e9e2,#fff 15%,#fff 88%,#e8e8e2);padding:0;touch-action:none;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:0;box-shadow:inset 0 -5px 0 #e0e0d9;transition:background .08s,transform .08s}.piano-key span{font-size:11px;margin-top:auto}.piano-key kbd{font-family:var(--mono);font-size:8px;color:#8b8b80;margin-bottom:9px}.piano-key.black{position:absolute;z-index:2;width:4%;height:76px;top:3px;background:linear-gradient(90deg,#171716,#33332f 80%,#111);color:white;box-shadow:inset 0 -5px 0 #111,1px 2px 1px #777;border:1px solid #111;transform:translateX(-50%);justify-content:flex-end}.piano-key.black span{font-size:8px}.piano-key.black kbd{color:#d3d3cb;margin-bottom:7px;font-size:7px}.piano-key:hover:not(:disabled){transform:none;background:#f2f1e9}.piano-key.black:hover{transform:translateX(-50%);background:#484841}.piano-key.active,.piano-key.hint{background:var(--key-color,#cbd9cb)}.piano-key.active{transform:translateY(3px)!important;box-shadow:inset 0 -2px 0 #999}.piano-key.black.active{transform:translate(-50%,3px)!important;background:#819abc}.piano.independent .piano-key.hint{background:white}.piano.independent .piano-key span{visibility:hidden}.keyboard-footer{display:flex;gap:15px;justify-content:space-between;font-size:8px;color:var(--muted);padding:10px 3px}.touch-hint{display:none}.app-footer{display:flex;justify-content:space-between;font-size:7px;letter-spacing:1px;border-top:1px solid var(--line);padding:15px 0;margin-top:7px;color:var(--muted)}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}.comparison-card{border:1px solid var(--line);border-radius:4px;padding:11px 7px;background:#fcfcfa}.comparison-card:nth-child(2){background:#f5f7fc}.comparison-card h3{font-size:14px;font-weight:500}.comparison-card .staff{height:110px;margin:2px 0}.comparison-card button{font-size:10px}.compare-change{font-size:10px;margin-top:11px}.material-tools{display:flex;justify-content:center;align-items:center;gap:10px;margin-bottom:12px;font-size:10px}.material-tools select,.form-field select,.form-field input{border:1px solid #aaa99e;border-radius:3px;background:white;padding:7px 10px}.back-to-lesson{margin-bottom:10px;font-size:9px;text-decoration:underline}.rhythm-visual{display:flex;gap:18px;justify-content:center;align-items:center;height:150px}.beat{display:flex;align-items:center;justify-content:center;width:62px;height:72px;border:2px solid var(--ink);border-radius:45% 50% 42% 48%;font-size:32px;background:var(--wash);box-shadow:2px 3px 0 #ccc}.beat.pulse{background:var(--yellow);transform:scale(1.08)}.exercise-targets{display:flex;gap:12px;justify-content:center;margin:20px}.target-note{font-size:24px;border-bottom:3px solid #ddd;width:50px;padding:6px}.target-note.done{border-color:var(--mint);color:#5d8468}.target-note.wrong{border-color:var(--red)}
.page-heading{padding:40px 0 28px;border-bottom:1px solid var(--ink);margin-bottom:28px}.page-heading h1{font-size:30px;font-family:var(--sans);letter-spacing:1px}.page-heading p{color:var(--muted);margin-top:10px;font-size:12px}.practice-list{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:35px}.practice-card{padding:28px;border:1px solid var(--ink);border-radius:4px 9px 5px 7px;text-align:left;background:#fff;min-height:210px;position:relative}.practice-card small{color:var(--muted);font-size:10px;display:block;margin-bottom:20px}.practice-card h2{font-size:23px;margin-bottom:9px;font-family:var(--sans)}.practice-card p{font-size:11px;color:var(--muted)}.practice-card .card-arrow{position:absolute;bottom:20px;right:24px;font-size:27px}.practice-card:hover{box-shadow:4px 4px 0 var(--ink);background:var(--wash)}.practice-card .color-dots{display:flex;gap:5px;margin-top:20px}.color-dots i{display:block;width:15px;height:15px;border:1px solid var(--ink);border-radius:45%;background:var(--red)}.color-dots i:nth-child(2){background:var(--blue)}.color-dots i:nth-child(3){background:var(--yellow)}.notes-layout{display:grid;grid-template-columns:1fr 1fr;gap:30px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:16px}.section-heading h2{font-size:16px}.skill-row{display:grid;grid-template-columns:1fr auto;gap:8px;padding:15px 0;border-bottom:1px solid var(--line)}.skill-row small{grid-column:1/-1;color:var(--muted);font-size:10px}.stage{font-size:10px;border:1px solid var(--line);border-radius:20px;padding:2px 9px}.record-row{border-bottom:1px solid var(--line);padding:15px 0;font-size:11px}.record-row small{display:block;color:var(--muted);font-size:9px;margin-top:5px}.empty-state{padding:28px 20px;background:var(--wash);font-size:12px;line-height:2}.material-row{display:block;text-align:left;padding:15px 0;border-bottom:1px solid var(--line);width:100%;font-size:12px}.material-row small{display:block;color:var(--muted);font-size:9px}.export-actions{display:flex;gap:10px;margin:30px 0;flex-wrap:wrap}.settings-layout{display:grid;grid-template-columns:1.3fr 1fr;gap:40px}.settings-section{padding-bottom:25px;margin-bottom:25px;border-bottom:1px solid var(--line)}.settings-section h2{font-size:17px;margin-bottom:12px}.settings-section p{font-size:11px;line-height:1.9;color:var(--muted);margin-bottom:15px}.form-field{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:15px 0;font-size:12px}.form-field input[type=checkbox]{accent-color:var(--ink);width:17px;height:17px}.connection-status{padding:14px;background:var(--wash);font-size:11px;margin:15px 0;line-height:2}.settings-section code{display:inline-block;background:var(--wash);padding:0 4px;font-size:11px}.settings-section details{font-size:11px;line-height:2;margin-top:16px}.settings-section summary{cursor:pointer;text-decoration:underline}.settings-section a{text-decoration:underline}.status-line{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:10px 0;font-size:11px}.status-line span:last-child{color:var(--muted)}.tone-label{display:flex;gap:10px}.warning{color:#a84b35!important}.route-enter{animation:routeIn .6s var(--ease) both}.scene-pause .canvas::after{content:'課堂已暫停';position:absolute;inset:0;display:grid;place-items:center;background:#ffffffed;font-size:20px;letter-spacing:5px}.scene-pause .canvas>*{opacity:.2}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,20px);background:var(--ink);color:#fff;border-radius:6px;padding:12px 24px;font-size:12px;opacity:0;pointer-events:none;transition:.3s;z-index:100;max-width:90vw}.toast.visible{opacity:1;transform:translate(-50%,0)}dialog{border:1.5px solid var(--ink);border-radius:5px 15px 5px 9px;padding:36px;width:min(520px,90vw);box-shadow:7px 7px 0 #20201e44;color:var(--ink);background:white}dialog[open]{animation:modalIn .45s var(--ease)}dialog::backdrop{background:#18181765;backdrop-filter:blur(4px)}dialog h2{font-size:24px;line-height:1.5;margin-bottom:16px}dialog p{font-size:12px;line-height:1.9;margin-bottom:20px}.dialog-close{position:absolute;right:12px;top:10px;font-size:24px}.quiz-options{display:flex;flex-direction:column;gap:10px}.quiz-option{text-align:left;padding:13px 16px;border:1px solid var(--ink);border-radius:5px;font-size:13px}.quiz-option.correct{background:#e5efe4}.quiz-option.incorrect{background:#fff0eb}.quiz-feedback{margin-top:20px;font-size:12px;line-height:1.8}.completion-note{font-size:44px;margin-bottom:10px;color:var(--yellow)}#print-notes{display:none}#scene-wipe{position:fixed;inset:86px 0 auto;height:2px;background:var(--ink);z-index:99;transform-origin:left;transform:scaleX(0);pointer-events:none}#scene-wipe.animate{animation:wipe .5s var(--ease)}
@keyframes panelIn{from{opacity:0;transform:translateY(20px) rotate(.4deg)}to{opacity:1;transform:none}}@keyframes routeIn{from{opacity:0;transform:translateY(28px);clip-path:inset(0 0 10% 0)}to{opacity:1;transform:none;clip-path:inset(0)}}@keyframes modalIn{from{opacity:0;transform:translateY(40px) scale(.95) rotate(-1deg)}to{opacity:1;transform:none}}@keyframes float{0%,100%{translate:0 0;rotate:-10deg}50%{translate:2px -7px;rotate:5deg}}@keyframes wipe{0%{transform:scaleX(0)}50%{transform:scaleX(1)}100%{transform:scaleX(0);transform-origin:right}}
@media(min-width:1500px){.topbar{height:94px;padding:0 40px}.app-shell{grid-template-columns:225px}.sidebar{padding-top:36px}#workspace{padding:0 35px}.welcome{height:195px}.classroom-grid{grid-template-columns:minmax(0,1fr) 320px;gap:20px}.teaching-panel{min-height:486px}.canvas{padding-top:34px}.canvas h2{font-size:33px}.staff{height:185px}.portrait-wrap{height:148px}.teacher-portrait{height:210px}.teacher-transcript{font-size:12px}.teacher-name>span{font-size:9px}.teacher-tools button{font-size:10px}.piano-section{padding-top:25px}.piano{height:145px}.piano-key.black{height:84px}.keyboard-footer{font-size:9px}.studio-art{height:215px}}
@media(max-width:1150px){.topbar{gap:15px;padding:0 22px}.nav-button{padding:8px 14px}.nav-button span{display:none}.app-shell{grid-template-columns:165px}.sidebar{padding:27px 12px}.lesson-item{gap:10px;padding:14px 8px}.lesson-item b{font-size:11px}#workspace{padding:0 22px}.classroom-grid{grid-template-columns:minmax(0,1fr) 250px;gap:12px}.welcome{height:155px}.welcome h1{font-size:30px}.welcome p{font-size:10px}.studio-art{width:45%}.canvas{padding:24px 16px 12px}.canvas h2{font-size:22px}.teacher-panel{padding:12px}.teacher-name>span{font-size:7px}.piano-toolbar h2 span{display:none}.piano-tools{gap:8px}.lesson-actionbar{padding:8px 12px 16px;gap:6px}.button{padding:8px 11px}.piano-tools .volume-label input{width:65px}.keyboard-footer{font-size:7px}.teacher-label span{font-size:6px}}
@media(max-width:900px){.app-shell{display:block}.sidebar{border-right:0;border-bottom:1px solid var(--line);padding:10px 22px}.side-heading,.sidebar-art,.sidebar-bottom,.side-note{display:none}.lesson-list{flex-direction:row;gap:8px;overflow:auto}.lesson-item{flex:1;padding:8px 12px;align-items:center;white-space:nowrap;min-width:max-content;border:0}.lesson-item small{display:none}.lesson-item b{font-size:10px}.lesson-item>span{font-size:11px}.welcome{height:150px}.welcome h1{font-size:33px}.settings-layout{gap:25px}.classroom-grid{grid-template-columns:minmax(0,1fr) 260px}.topbar{height:73px}.brand>strong{font-size:37px}.brand>span{font-size:12px}.brand small{font-size:6px}.main-nav{margin-left:auto;margin-right:0}.settings-button{font-size:0;padding:8px 11px}.settings-button>span{font-size:19px}}
@media(max-width:680px){body{font-size:12px}.topbar{padding:0 17px;height:72px;gap:10px}.brand{gap:10px}.brand>strong{font-size:36px}.brand>span{font-size:11px}.brand small{font-size:5.8px}.main-nav{border:0;padding:0;gap:1px}.nav-button{padding:9px 9px;font-size:10px}.settings-button{padding:4px;border:0}.sidebar{padding:10px 16px}.lesson-item{padding:8px 10px;gap:7px}.lesson-item b{font-size:9px}#workspace{padding:0 17px}.welcome{height:155px}.welcome h1{font-size:28px;letter-spacing:-1px}.welcome p{font-size:9px;letter-spacing:.7px}.welcome-copy{background:linear-gradient(90deg,white 85%,transparent);padding-right:25px}.studio-art{width:46%;right:-30px;height:160px;top:0;opacity:.8}.classroom-grid{grid-template-columns:1fr;gap:18px}.canvas{min-height:260px}.canvas h2{font-size:25px}.teaching-panel{min-height:393px}.staff{height:160px}.teacher-panel{display:grid;grid-template-columns:90px 1fr;gap:0 12px;padding:15px}.teacher-label{grid-column:1/-1;margin-bottom:10px}.portrait-wrap{height:100px;margin:0;grid-column:1;grid-row:2/4}.teacher-portrait{height:110px;margin:0;object-position:center}.teacher-name{grid-column:2;gap:8px;padding:0 0 5px}.teacher-name h2{font-size:24px}.teacher-name>span{font-size:8px}.teacher-transcript{grid-column:2;font-size:11px;min-height:75px;max-height:160px}.teacher-tools,#question-form,.teacher-footnote{grid-column:1/-1}.teacher-tools{grid-template-columns:repeat(3,1fr);margin:12px 0 10px}.teacher-tools button{font-size:10px;padding:7px 3px}.teacher-footnote{font-size:8px}.floating-note{font-size:13px}.note-one{left:0;top:14px}.note-two{right:0;top:40px}.piano-section{padding-top:23px}.piano-toolbar{flex-wrap:wrap;gap:12px}.piano-toolbar h2{font-size:17px;width:100%}.piano-toolbar h2 span{display:inline-block}.piano-tools{width:100%;justify-content:space-between;gap:5px}.pill{font-size:9px;padding:4px 8px}.piano-tools .volume-label input{width:65px}.piano{min-width:620px;height:142px}.keyboard-footer{font-size:8px;flex-wrap:wrap;gap:5px}.desktop-hint{display:none}.touch-hint{display:inline}.keyboard-footer #save-status{width:100%}.app-footer{font-size:6px;letter-spacing:.3px;margin-top:15px}.page-heading{padding:30px 0 20px}.page-heading h1{font-size:27px}.practice-list,.notes-layout,.settings-layout{grid-template-columns:1fr}.practice-card{padding:24px;min-height:190px}.practice-card h2{font-size:22px}.notes-layout{gap:30px}.settings-layout{gap:0}.comparison{gap:7px}.comparison-card h3{font-size:12px}.comparison-card .staff{height:100px}.panel-toolbar{padding:12px 15px}.volume-label{gap:4px}.rhythm-visual{gap:12px}.beat{width:53px;height:62px}.canvas-caption{font-size:11px}.lesson-actionbar{padding-bottom:18px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}body.reduce-motion *,body.reduce-motion *::before,body.reduce-motion *::after{animation:none!important;transition:none!important}
@media print{body>*{display:none!important}#print-notes{display:block!important;padding:20px;font:13px/1.8 sans-serif;color:#000}#print-notes h1{font-size:26px}#print-notes h2{margin-top:25px;font-size:18px}#print-notes p{margin:8px 0}#print-notes .staff{height:180px}}
/* Motion follows the supplied recording: lateral sheets, clipped headlines, marker reveals. */
@keyframes routeIn{from{opacity:0;transform:translateX(34px);clip-path:inset(0 0 0 4%)}to{opacity:1;transform:none;clip-path:inset(0)}}
@keyframes headlineSwap{from{opacity:0;transform:translateY(55%);clip-path:inset(0 0 80%)}to{opacity:1;transform:none;clip-path:inset(0)}}
@keyframes markerReveal{from{background-size:0 100%}to{background-size:100% 100%}}
.canvas.scene-enter h2{animation:headlineSwap .5s cubic-bezier(.16,1,.3,1)}
.lesson-item.active{background-image:linear-gradient(175deg,#20201e,#292926);background-repeat:no-repeat;animation:markerReveal .4s ease-out}
.button::after{transition:transform .2s}.button:active{box-shadow:none;transform:translate(2px,2px)}
@media(min-width:901px) and (max-height:850px){.topbar{height:64px}.brand>strong{font-size:36px}.brand>span{font-size:12px}.brand small{font-size:6px}.nav-button{padding:7px 20px}.welcome{height:112px}.welcome h1{font-size:31px}.welcome p{font-size:10px;margin-top:6px}.studio-art{height:135px;top:-8px}.sidebar{padding-top:23px}.side-heading{margin-bottom:15px}.lesson-item{padding:13px}.teaching-panel{min-height:342px}.panel-toolbar{padding:9px 18px;min-height:41px}.canvas{padding:14px 24px 7px;min-height:210px}.canvas h2{font-size:24px}.canvas .canvas-description{font-size:10px;margin-top:3px}.staff{height:122px;margin:0 auto}.canvas-caption{font-size:11px;padding:1px 10px}.lesson-actionbar{padding:4px 18px 13px}.teacher-panel{padding:10px 13px 7px}.portrait-wrap{height:79px}.teacher-portrait{height:155px;margin-top:-37px;object-position:50% 65%}.teacher-name{padding:0 0 5px}.teacher-name h2{font-size:23px}.teacher-transcript{min-height:72px;max-height:104px;font-size:10px;padding:8px 11px;line-height:1.8}.teacher-tools{margin:7px 0;gap:4px}.teacher-tools button{font-size:8px;padding:4px 0}#question{padding:7px;font-size:9px}.teacher-footnote{font-size:7px;margin-top:5px}.piano-section{padding-top:17px}.piano-toolbar{margin-bottom:10px}.piano{height:105px}.piano-key.black{height:63px}.piano-key kbd{margin-bottom:5px}.piano-key span{font-size:10px}.keyboard-footer{padding:7px 2px}.app-footer{padding:9px 0;margin-top:1px}.comparison{margin-top:8px}.comparison-card{padding:6px}.comparison-card .staff{height:79px}.material-tools{margin-bottom:5px}.compare-change{margin-top:7px}.rhythm-visual{height:132px}}
@media(min-width:901px) and (max-height:850px){.teacher-transcript{font-size:11px;line-height:1.8}.teacher-tools button{font-size:9px}.teacher-label{font-size:11px}.canvas .canvas-description{font-size:11px}.canvas-caption{font-size:12px}.piano-key kbd{font-size:9px}.teacher-name>span{font-size:8px}}
@media(max-width:420px){.brand>span{display:none}.nav-button{padding:8px 10px}.brand>strong{font-size:34px}.topbar{gap:7px}.welcome h1{font-size:25px}.welcome-copy{padding-right:5px}.studio-art{width:38%;opacity:.65}.piano-tools .volume-label input{width:48px}.tempo-label{font-size:9px}}
/* Canonical art direction: Colorfigures' illustrated objects, paper and ink.
   Replaces the superseded manga image concept. All current artwork is editable SVG/CSS. */
:root{--paper:#f2f0e9;--wash:#eae8df;--ink:#252620;--line:#cfcec4;--muted:#7c7d72}
body{background:var(--paper)}.topbar{background:var(--paper);border-color:#b8b8ac;height:80px}.brand>strong{font-size:39px}.brand>span{font-size:12px}.brand small{font-size:6px}.main-nav{padding:3px;border-color:var(--ink)}.nav-button{font-family:var(--mono);padding:8px 19px;font-size:12px}.nav-button span{font-size:9px}.settings-button{border:1.5px solid var(--ink);padding:7px 17px}.sidebar{border-color:#c7c7bd;background:#f5f3ed}.side-heading{font-size:13px;letter-spacing:.5px}.side-heading small{font-size:9px}.lesson-item{border:0;border-radius:6px;box-shadow:none!important;transform:none!important;padding:13px 12px}.lesson-item.active{background:#252620;color:#f5f3ed}.lesson-item b{font-weight:400}.lesson-item small{font-size:9px}.side-note{font-size:10px}.sidebar-specimen{margin-top:auto;display:flex;align-items:center;gap:15px;padding:45px 10px 25px;color:#77796c}.sidebar-specimen>span{font-size:50px;transform:rotate(-15deg);font-family:Georgia,serif}.sidebar-specimen small{font-size:9px;line-height:1.6;letter-spacing:1px}.sidebar-bottom{background:transparent;border-top:1px solid var(--line);margin-top:0}.welcome{height:145px;justify-content:space-between}.welcome-copy{background:none;padding:0}.welcome h1{font-family:var(--sans);font-size:34px;font-weight:650;letter-spacing:-1px}.welcome p{font-size:11px;letter-spacing:1px;color:#7b7d71}.welcome-mark{display:flex;align-items:center;gap:5px;transform:rotate(-5deg);margin-right:12px}.welcome-mark i{display:block;width:22px;height:22px;border:1.5px solid var(--ink);border-radius:46% 50%;background:#e3b558;box-shadow:2px 3px 0 #252620}.welcome-mark i:nth-child(2){background:#df7358;transform:translateY(-10px)}.welcome-mark i:nth-child(3){background:#87a2ba;transform:translateY(-4px)}.welcome-mark span{display:none}.ink-panel{border:1px solid #b9bbae;border-radius:6px;background:#eeede5;box-shadow:none}.teaching-panel{border:0;background:transparent;box-shadow:none;min-height:470px}.panel-toolbar{border-bottom:1px solid #bfc0b3;padding:10px 0;min-height:43px;font-size:11px}.canvas{padding:24px 12px 10px;min-height:320px}.canvas h2{font-family:var(--sans);font-size:25px;font-weight:550;letter-spacing:1px}.canvas .canvas-description{font-size:11px;color:#797b70;line-height:1.7}.object-lesson{height:270px;position:relative;display:flex;align-items:center;justify-content:center;isolation:isolate;margin-top:3px}.piano-object{width:365px;height:285px;object-fit:contain;margin-left:45px;transition:transform .65s var(--ease);filter:contrast(1.06)}.board-depth .piano-object{transform:translate(0,-3px) rotate(-1deg)}.object-caption{position:absolute;bottom:4px;right:16px;color:#7d8074;font-size:8px;letter-spacing:.7px}.note-experiments{position:absolute;left:15px;top:28px;display:flex;flex-direction:column;gap:10px;z-index:2}.note-experiments>span{font-size:8px;letter-spacing:1px;color:#7d8074;margin-bottom:3px}.specimen-note{display:flex;gap:12px;align-items:center;width:91px;background:var(--note-paint);border:1.5px solid var(--ink);border-radius:6px 5px 7px 4px;box-shadow:3px 4px 0 var(--ink);padding:5px 12px;text-align:left;transform:rotate(-1deg)}.specimen-note b{font-size:22px;font-weight:500;line-height:1.4}.specimen-note small{font-size:10px}.specimen-note:hover:not(:disabled){transform:translateY(-3px) rotate(2deg);box-shadow:4px 7px 0 var(--ink)}.specimen-note:active:not(:disabled){transform:translate(3px,4px);box-shadow:0 0 0 var(--ink)}.canvas-caption{font-size:12px;letter-spacing:1px;border:0;background:none;transform:none;padding:2px 0}.lesson-actionbar{padding:14px 0 8px;gap:11px;justify-content:flex-start}.button{border:1.3px solid var(--ink);border-radius:30px;padding:7px 16px;background:var(--paper);box-shadow:none;font-size:11px;letter-spacing:.15px}.button.primary{background:var(--ink);color:var(--paper);box-shadow:none}.button:hover:not(:disabled){box-shadow:2px 3px 0 var(--ink);transform:translateY(-2px)}.button:active:not(:disabled){box-shadow:none;transform:translate(1px,2px)}.text-button{font-size:10px}.teacher-panel{padding:18px;background:#f7f5ee;justify-content:flex-start}.teacher-label{font-size:11px}.teacher-label span{font-size:7px}.tutor-device{width:147px;height:79px;background:#c4cdbb;border:1.5px solid var(--ink);border-radius:7px;box-shadow:6px 7px 0 #89927c,7px 8px 0 1px var(--ink);margin:22px auto 17px;transform:rotate(-3deg);position:relative}.device-screen{display:flex;align-items:center;justify-content:center;gap:4px;position:absolute;top:12px;left:10px;background:#353b33;width:91px;height:37px;border:1px solid var(--ink);border-radius:3px}.device-screen i{width:3px;height:10px;background:#afc3a8}.device-screen i:nth-child(2n){height:20px}.device-screen i:nth-child(3n){height:14px}.device-dial{width:22px;height:22px;border:1.5px solid var(--ink);background:#f4f2e8;position:absolute;right:11px;top:20px;border-radius:50%;box-shadow:1px 2px 0 #89927c}.device-dial:after{content:'';position:absolute;width:1px;height:7px;background:#252620;left:10px;top:2px;transform:rotate(25deg)}.tutor-device>span{font:7px var(--mono);position:absolute;bottom:9px;left:12px;letter-spacing:1px}.teacher-name{padding:6px 0 13px;gap:10px;align-items:center}.teacher-name h2{font-family:var(--mono);font-size:22px;font-weight:500}.teacher-name h2 span{font-size:9px}.teacher-name>span{font-size:8px}.teacher-transcript{background:transparent;border-top:1px solid var(--line);border-bottom:1px solid var(--line);border-radius:0;padding:13px 0;font-size:12px;min-height:105px;max-height:170px;flex:1}.teacher-tools{gap:5px;margin:12px 0}.teacher-tools button{border:1px solid #777b6b;border-radius:20px;font-size:9px;padding:5px 1px;background:transparent}#question{border-color:#a6a99b;border-radius:20px;font-size:10px;padding:9px 12px;background:#f7f5ee}#question-form button{border-radius:50%;font-size:21px;width:35px;height:35px;min-width:35px;align-self:center}.teacher-footnote{font-size:7.5px}.piano-section{margin-top:16px;border-top:1px solid #c5c6bb;padding:17px 0 0}.piano-toolbar h2{font:13px var(--mono)}.piano-toolbar h2 span{font-size:9px}.piano-tools{gap:13px}.pill{border-color:var(--ink);background:transparent;border-width:1.2px;padding:4px 10px;font-size:9px}.tempo-label input{background:transparent}.piano{height:119px;border-width:2px;background:#30352b;box-shadow:2px 4px 0 #8d9484;transform:perspective(1000px) rotateX(4deg);transform-origin:top}.piano-key{background:linear-gradient(98deg,#e5e5da,#fbfaf1 15%,#f8f7ed 88%,#dbddd1);box-shadow:inset 0 -4px 0 #cccfbf;border-color:#555b4d}.piano-key.black{background:#30392d;box-shadow:inset 0 -4px 0 #1e251c,1px 2px 0 #819077;border:1px solid #20251e;height:69px}.piano-key.hint{background:var(--key-color)}.piano-key.active{background:#b8c8a9}.keyboard-footer{font-size:8px}.staff{height:155px}.teaching-surface{transition:transform .65s var(--ease),box-shadow .65s var(--ease);transform-style:preserve-3d;border:1px solid #c0c3b5;border-radius:6px;padding:7px;background:#f8f6ee;margin:18px 0 12px}.board-depth .teaching-surface{transform:perspective(1100px) rotateX(7deg) rotateY(-7deg);box-shadow:5px 7px 0 #b0b9a3,6px 8px 0 1px #343b2d}.teaching-surface .comparison{margin-top:0}.teaching-surface .rhythm-visual{margin:0}.board-view{font-size:9px!important;border:1px solid var(--ink);border-radius:20px;width:auto!important;height:auto!important;padding:4px 9px;line-height:1.4!important;white-space:nowrap}.board-view[aria-pressed=true]{background:#c8d2bb}.comparison-card{border:1px solid #9da48e;border-radius:6px;background:#eeeedd;padding:11px 8px}.comparison-card:nth-child(2){background:#dfe5e8}.comparison-card h3{font-size:14px}.comparison-card .staff{height:105px}.comparison-card button{font-size:10px}.material-tools select,.form-field select,.form-field input{border:1px solid var(--ink);border-radius:20px;background:transparent}.practice-card{background:#f6f4ed;border:1px solid #929986;border-radius:8px}.practice-card h2{font-family:var(--sans);font-size:24px;font-weight:500}.practice-card:hover{background:#e8e9dc;box-shadow:4px 5px 0 #76816b}.practice-card:first-child:after{content:'';position:absolute;right:20px;bottom:25px;width:130px;height:110px;background:url('assets/piano-object.svg') center/contain no-repeat;opacity:.9}.practice-card:first-child .card-arrow{z-index:1}.page-heading h1{font-weight:550}.empty-state{border:1px dashed #a6ad98;border-radius:6px;background:#eeeee3}.feedback{margin:3px 0 10px;border-radius:4px;background:#e8e9dd}.connection-status{background:#e7ebdf;border-radius:6px}.settings-section{border-color:#bfc4b3}.quiz-option{border-radius:25px;background:var(--paper)}dialog{background:var(--paper);border-radius:12px}.app-footer{border-color:#c8cbbd}#scene-wipe{background:#363d2e;height:3px;top:80px}
@media(min-width:1500px){.welcome{height:155px}.classroom-grid{grid-template-columns:minmax(0,1fr) 320px;gap:34px}.teaching-panel{min-height:490px}.object-lesson{height:300px}.piano-object{width:420px;height:320px}.note-experiments{top:30px;left:30px}.canvas h2{font-size:30px}.specimen-note{width:103px;padding:8px 15px}.teacher-panel{padding:23px}.tutor-device{margin:29px auto 24px}.teacher-transcript{font-size:13px}.piano{height:133px}.piano-key.black{height:77px}.piano-section{padding-top:22px}}
@media(min-width:901px) and (max-height:850px){.topbar{height:64px}.welcome{height:108px}.welcome h1{font-size:29px}.classroom-grid{gap:24px}.canvas{min-height:215px;padding:14px 5px 6px}.canvas h2{font-size:23px}.teaching-panel{min-height:350px}.object-lesson{height:208px;margin-top:-6px}.piano-object{width:295px;height:235px;margin-left:55px}.object-caption{bottom:0;right:15px;font-size:7px}.note-experiments{top:27px;left:7px;gap:7px}.specimen-note{width:82px;padding:2px 11px}.specimen-note b{font-size:20px}.note-experiments>span{font-size:7px}.lesson-actionbar{padding:9px 0 5px}.teacher-panel{padding:12px 15px}.tutor-device{transform:rotate(-3deg) scale(.8);margin:6px auto 3px;height:65px}.device-screen{height:29px;top:9px}.device-dial{top:15px}.tutor-device>span{bottom:6px}.teacher-name{padding:4px 0 7px}.teacher-name h2{font-size:20px}.teacher-transcript{font-size:11px;min-height:90px;max-height:117px;padding:9px 0}.teacher-tools{margin:8px 0}.teacher-tools button{font-size:9px;padding:4px 0}#question{padding:7px 10px}.teacher-footnote{font-size:7px}.piano-section{margin-top:12px;padding-top:14px}.piano{height:102px}.piano-key.black{height:60px}.piano-toolbar{margin-bottom:10px}.teaching-surface{margin:11px 0 8px}.teaching-surface .staff{height:112px}.comparison-card{padding:8px}.comparison-card .staff{height:84px}.comparison-card h3{font-size:13px}.comparison{gap:11px}.canvas-caption{font-size:11px}#scene-wipe{top:64px}}
@media(max-width:900px){.sidebar{background:var(--paper)}.sidebar-specimen{display:none}.topbar{height:73px}.welcome{height:130px}.welcome h1{font-size:30px}.welcome-mark{scale:.75;transform-origin:right}.lesson-item{padding:7px 11px}.classroom-grid{gap:18px}.canvas{padding-left:5px;padding-right:5px}.object-lesson{height:258px}.piano-object{width:315px;height:275px;margin-left:40px}.note-experiments{left:0;top:42px}.specimen-note{width:75px;padding:4px 9px;gap:8px}.object-caption{right:0;font-size:7px}.slide-controls{gap:8px}.piano-tools{gap:7px}}
@media(max-width:680px){.topbar{height:70px}.brand>strong{font-size:34px}.nav-button{font-size:9px;padding:7px 9px}.main-nav{padding:3px;border:1px solid var(--ink)}.settings-button{padding:3px;border:0}.welcome{height:125px}.welcome h1{font-size:24px;letter-spacing:-.5px}.welcome p{font-size:9px;letter-spacing:0}.welcome-mark{display:none}.teaching-panel{min-height:385px}.panel-toolbar{font-size:10px;padding:11px 0}.board-view{font-size:8px!important;padding:4px 6px}.slide-controls>span{font-size:8px}.canvas h2{font-size:23px}.canvas{padding-top:21px;min-height:270px}.object-lesson{height:235px;margin-top:2px}.piano-object{width:300px;height:250px;margin-left:52px}.note-experiments{top:31px;left:2px}.specimen-note{width:72px;padding:3px 8px}.specimen-note b{font-size:20px}.note-experiments>span{font-size:7px}.object-caption{font-size:6px;right:0;bottom:1px}.lesson-actionbar{padding-top:13px;gap:8px}.button{font-size:10px;padding:7px 13px}.canvas .canvas-description{font-size:10px}.teacher-panel{display:grid;grid-template-columns:100px 1fr;padding:16px;gap:0 12px}.tutor-device{grid-row:2/4;grid-column:1;scale:.62;transform-origin:top left;margin:8px 0 0;width:145px}.teacher-name{grid-column:2;padding:0 0 7px}.teacher-name h2{font-size:21px}.teacher-name>span{font-size:7px}.teacher-transcript{grid-column:2;font-size:11px;min-height:90px;padding:8px 0}.teacher-tools{grid-column:1/-1}.teacher-tools button{font-size:10px;padding:6px}.teacher-footnote{font-size:7px}.comparison-card h3{font-size:12px}.comparison-card .staff{height:100px}.teaching-surface{padding:5px}.board-depth .teaching-surface{transform:perspective(1100px) rotateX(4deg) rotateY(-4deg);box-shadow:3px 5px 0 #b0b9a3,4px 6px 0 1px #343b2d}.piano-toolbar h2{font-size:15px}.piano-toolbar h2 span{font-size:8px}.piano{height:126px}.piano-key.black{height:75px}.piano-tools{gap:6px}.pill{font-size:8px;padding:5px 8px}.tempo-label input{width:35px}.piano-tools .volume-label input{width:48px}.app-footer{font-size:6px}.form-field{font-size:11px}.topbar .brand>span{display:none}#scene-wipe{top:70px}}
@media(prefers-reduced-motion:reduce){.board-depth .teaching-surface,.board-depth .piano-object,.piano{transform:none}}
.note-blocks{display:flex;align-items:center;justify-content:center;gap:15px;padding:17px 0 10px;transform-style:preserve-3d}.note-block{width:38px;height:35px;background:var(--block-color);border:1.5px solid #2d3426;border-radius:5px 4px 5px 3px;box-shadow:3px 5px 0 #6c765f,4px 6px 0 1px #2d3426;font:15px var(--mono);transform:translateZ(5px);transition:transform .25s,box-shadow .25s}.note-block:hover:not(:disabled),.note-block.playing{transform:translate3d(0,-5px,18px);box-shadow:4px 9px 0 #6c765f,5px 10px 0 1px #2d3426}.note-block:active:not(:disabled){transform:translate3d(3px,5px,0);box-shadow:none}.comparison-card:nth-child(2) .third-note{transform:translateY(7px)}.scene-enter .note-block{animation:noteRise .7s var(--ease) both}.scene-enter .note-block:nth-child(2){animation-delay:.07s}.scene-enter .note-block:nth-child(3){animation-delay:.14s}@keyframes noteRise{from{opacity:0;transform:translateY(15px) rotateX(-25deg)}to{opacity:1;transform:translateY(0)}}.note-blocks+.staff{height:92px}.board-depth .comparison-card{box-shadow:2px 3px 0 #bbc3ad}.comparison-card .canvas-caption{font-size:11px}.teaching-surface .comparison-card p{font-size:10px}
@media(min-width:901px) and (max-height:850px){.note-blocks{padding:8px 0 7px;gap:10px}.note-block{width:31px;height:26px;font-size:12px;box-shadow:2px 3px 0 #6c765f,3px 4px 0 1px #2d3426}.note-blocks+.staff{height:60px}.comparison-card .canvas-caption{font-size:9px}}
@media(max-width:680px){.note-blocks{gap:10px;padding:10px 0}.note-block{width:28px;height:29px;font-size:12px}.note-blocks+.staff{height:82px}}

.teaching-surface{margin-left:14px;margin-right:14px}.teaching-panel{overflow:visible}.comparison-card{min-width:0}.teaching-surface .comparison{gap:14px}
@media(max-width:680px){.teaching-surface{margin-left:5px;margin-right:5px}.teaching-surface .comparison{gap:8px}}

/* Lesson hierarchy: framed zones, theory first, details on demand. */
.course-heading{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:26px 0 20px}.course-heading p{font-size:9px;letter-spacing:1.4px;color:var(--muted);margin-bottom:4px}.course-heading h1{font:600 29px/1.4 var(--sans);letter-spacing:.5px}.course-heading>.button{font-size:10px}.lesson-path{display:flex;align-items:center;gap:12px;margin:0 0 22px;max-width:620px}.lesson-path button{flex:1;display:flex;align-items:center;gap:9px;text-align:left;padding:9px 12px;border:1px solid #c1c3b8;border-radius:30px;font-size:12px;white-space:nowrap}.lesson-path button span{border:1px solid var(--ink);border-radius:50%;width:24px;height:24px;display:grid;place-items:center;font-size:10px}.lesson-path button b{font-weight:400}.lesson-path button[aria-current=step]{background:var(--ink);color:var(--paper);border-color:var(--ink)}.lesson-path button[aria-current=step] span{border-color:var(--paper)}.lesson-path i{font-style:normal;color:#919487}.classroom-grid{grid-template-columns:minmax(0,1fr) 272px;gap:20px;align-items:start}.ink-panel{border:1.5px solid var(--ink);border-radius:8px;background:#f8f6ef}.teaching-panel{min-height:0;overflow:hidden;box-shadow:3px 4px 0 #d3d6c9}.panel-toolbar{padding:13px 20px;border-bottom:1px solid var(--ink);background:#e7e9dd;min-height:49px}.zone-title{font:500 13px/1.5 var(--mono);display:flex;align-items:center;gap:10px;letter-spacing:.4px}.zone-title>span{font-size:11px;background:var(--ink);color:var(--paper);border-radius:4px;padding:3px 6px}.zone-title small{font:9px var(--mono);border-left:1px solid #a6ab99;padding-left:10px;color:#656d59}.concept-strip{padding:16px 22px 0;text-align:left}.concept-strip>span{font-size:11px;font-weight:600}.concept-strip>p{font:12px/1.85 var(--sans);max-width:64ch;margin:5px 0}.concept-strip>.text-button{padding:3px 0;font-size:10px;color:#5a674b;text-decoration:underline;text-underline-offset:4px}.canvas{padding:8px 20px 9px;min-height:180px}.canvas>h2{display:none}.canvas>.canvas-description{display:none}.canvas-caption{font-size:10px;color:#6d7165}.object-lesson{height:225px;margin-top:4px}.piano-object{height:220px;width:290px;max-height:100%;margin-left:60px}.object-caption{display:none}.note-experiments{left:15px;top:25px;gap:10px}.note-experiments>span{display:none}.specimen-note{width:75px;padding:3px 10px;gap:8px}.specimen-note b{font-size:20px}.specimen-note small{font-size:9px}.lesson-actionbar{border-top:1px solid var(--line);padding:12px 20px;background:#f0f0e5;gap:10px;justify-content:flex-end}.lesson-actionbar .slide-controls{margin-right:auto;gap:8px}.slide-controls>span{color:#555e4b;font-size:10px}.slide-controls button{border:1px solid #a6ab99;border-radius:50%;height:25px;width:25px;font-size:15px}.lesson-actionbar .button{font-size:10px;padding:6px 13px}.lesson-actionbar #pause-button{font-size:10px;padding:3px}.teaching-surface{margin:15px 10px 12px}.teaching-surface .staff{height:132px}.teaching-surface .comparison-card .staff{height:75px}.teaching-surface .rhythm-visual{height:135px}.canvas .material-tools{margin-top:4px}.teacher-panel{padding:17px;display:flex;gap:0;box-shadow:3px 4px 0 #d3d6c9}.teacher-label{border-bottom:1px solid var(--line);padding-bottom:10px;font-size:11px}.teacher-label span{font-size:7px}.teacher-name{padding:8px 0 4px;display:flex;gap:10px}.teacher-name h2{font-size:23px}.teacher-name>span{font-size:8px}.tutor-device{transform:rotate(-3deg) scale(.8);margin:12px auto 0;height:73px;flex-shrink:0}.device-screen{height:33px;top:11px}.device-dial{top:17px}.tutor-device>span{bottom:8px}.teacher-intro{font-size:11px;color:#6f7566;margin:5px 0 12px}.suggested-questions{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.suggested-questions button{font-size:10px;text-align:left;padding:7px 10px;border:1px solid #babfaf;border-radius:5px;background:#efefe4}.teacher-panel #question-form{width:100%;grid-column:auto;margin-bottom:13px}#question{background:var(--paper);border:1px solid var(--ink);font-size:11px;padding:10px 12px}#teacher-answer,.teacher-assistance{border-top:1px solid var(--line);padding:9px 0;width:100%}.teacher-panel summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;font-size:10px}.teacher-panel summary::-webkit-details-marker{display:none}.teacher-panel details[open]>summary>span{transform:rotate(45deg)}.teacher-transcript{min-height:0;max-height:130px;border:0;font:12px/1.85 var(--sans);padding:10px 0 0;flex:none}.teacher-tools{grid-template-columns:repeat(2,1fr);margin-bottom:0}.teacher-tools button{font-size:9px;padding:6px 3px}.teacher-footnote{font-size:8px;text-align:left;line-height:1.7;border-top:1px solid var(--line);padding-top:10px;margin-top:0}.teacher-panel #expand-answer{padding:5px 0;text-decoration:underline}.piano-section{padding:0;margin:22px 0 20px;box-shadow:3px 4px 0 #d3d6c9;overflow:visible}.practice-zone-header{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:16px 20px}.practice-zone-header p{font-size:11px;color:#747a68;margin:7px 0 0}.practice-zone-header .button{font-size:10px}#piano-content{padding:16px 20px 4px;border-top:1px solid var(--ink);animation:panelIn .4s var(--ease)}.practice-actions{display:flex;align-items:center;gap:10px;margin-bottom:17px}.practice-actions .button{font-size:10px}.piano-settings{margin-left:auto;position:relative}.piano-settings summary{font-size:10px;cursor:pointer;text-decoration:underline;text-underline-offset:4px}.piano-settings .piano-tools{position:absolute;z-index:9;right:0;top:28px;display:flex;flex-wrap:wrap;gap:15px;width:300px;padding:20px;background:var(--paper);border:1.5px solid var(--ink);border-radius:8px;box-shadow:3px 4px 0 #c1c8b6}.piano-settings .volume-label{font-size:10px}.piano-settings .volume-label input{width:100px}.piano{height:125px}.piano-key.black{height:73px}.keyboard-footer{font-size:8px;padding-top:13px}.feedback{font:12px/1.8 var(--sans);margin:0 0 15px;text-align:left}.practice-active .practice-zone-header{background:#e7e9dd;border-radius:7px 7px 0 0}.app-footer{padding:12px 0;font-size:8px;letter-spacing:.4px}.sidebar-bottom{font-size:9px;margin-top:auto;padding-top:30px;border:0}.side-heading{margin-bottom:20px}.course-heading~.lesson-path{animation:panelIn .45s var(--ease)}
#reading-dialog{width:min(760px,92vw);max-height:87vh;padding:36px 42px;border-radius:9px;box-shadow:7px 8px 0 #727a62}#reading-dialog h2{font:600 26px/1.4 var(--sans);padding-right:25px}#reading-dialog .reading-eyebrow{font-size:10px;color:#6c755f;letter-spacing:1px;margin-bottom:12px}#reading-dialog .reading-intro{font-size:13px;line-height:1.9;padding-bottom:20px;border-bottom:1px solid var(--ink)}.theory-section{display:grid;grid-template-columns:30px 1fr;column-gap:14px;margin:25px 0}.theory-section>span{font-size:11px;padding-top:2px;color:#7d866e}.theory-section h3{font:600 16px/1.6 var(--sans);margin-bottom:8px}.theory-section p{font:13px/2 var(--sans);margin:0;white-space:pre-line}.theory-checks{background:#e8ecdf;padding:20px;border:1px solid #a4ad95;border-radius:5px;margin:25px 0}.theory-checks h3{font-size:13px;margin-bottom:12px}.theory-checks details{margin:12px 0}.theory-checks summary{cursor:pointer;font-size:12px}.theory-checks p{font-size:12px;margin:10px 0 0}.reading-takeaway{padding:14px 0;border-top:1px solid var(--ink);font-size:12px!important}.answer-full{font:14px/2 var(--sans);white-space:pre-wrap}.reading-return{margin-top:8px}.theory-section.current-section{border-left:3px solid #b1c499;padding-left:12px;margin-left:-15px}
@media(min-width:1500px){.course-heading{padding-top:35px}.classroom-grid{grid-template-columns:minmax(0,1fr) 300px;gap:25px}.canvas{min-height:265px}.object-lesson{height:275px}.piano-object{height:265px;width:350px}.concept-strip p{font-size:14px}.teacher-panel{padding:23px}.teacher-intro{font-size:12px}.suggested-questions button{font-size:11px}.teacher-transcript{font-size:13px}.lesson-actionbar .button{font-size:12px}.course-heading h1{font-size:34px}}
@media(max-width:1100px){.classroom-grid{grid-template-columns:minmax(0,1fr) 240px;gap:16px}.concept-strip{padding-left:16px;padding-right:16px}.lesson-actionbar{padding:12px}.lesson-actionbar #pause-button{display:none}.teacher-panel{padding:14px}.teacher-name{gap:7px}.teacher-name h2{font-size:20px}.object-lesson{height:218px}.piano-object{height:210px;width:235px;margin-left:70px}.note-experiments{left:0}.specimen-note{width:66px;padding:3px 8px}.canvas{padding:8px 14px}.course-heading h1{font-size:27px}}
@media(max-width:760px){.classroom-grid{grid-template-columns:1fr}.teacher-panel{display:flex;position:relative;padding:18px}.tutor-device{position:absolute;right:20px;top:35px;margin:0;transform:rotate(-3deg) scale(.6);transform-origin:top right}.teacher-name{padding-top:15px;display:block}.teacher-name>span{display:block;margin-top:4px}.teacher-label{padding-right:0}.teacher-intro{margin-top:9px}.teacher-transcript{max-height:200px}.teacher-tools{grid-template-columns:repeat(3,1fr)}.suggested-questions{flex-direction:row;flex-wrap:wrap;margin-top:8px}.teacher-panel #question-form{margin-bottom:13px}.classroom-grid .teacher-panel{grid-row:2}.piano-section{margin-top:20px}.concept-strip p{font-size:12px}.course-heading{padding:23px 0 16px}.course-heading h1{font-size:26px}.lesson-path{gap:6px;margin-bottom:18px}.lesson-path button{padding:8px 9px;font-size:10px;gap:6px}.lesson-path button span{width:21px;height:21px;font-size:9px}.lesson-path i{font-size:10px}.object-lesson{height:240px}.piano-object{width:300px;height:230px;margin-left:50px}.note-experiments{left:12px;top:34px}.lesson-actionbar{padding:12px 14px}.lesson-actionbar #pause-button{display:block}.practice-zone-header{padding:15px}.practice-zone-header p{font-size:10px}.practice-zone-header .button{padding:6px 12px}#piano-content{padding:15px 12px 4px}.practice-actions{flex-wrap:wrap;gap:7px}.practice-actions .button{padding:6px 11px}.piano-settings .piano-tools{width:270px}.keyboard-footer{font-size:7px}.app-footer{font-size:7px}#reading-dialog{padding:30px 22px}#reading-dialog h2{font-size:22px}.theory-section{grid-template-columns:22px 1fr;gap:9px}.theory-section h3{font-size:15px}.theory-section p{font-size:13px}.zone-title{font-size:12px}}
@media(max-width:420px){#workspace{padding:0 14px}.course-heading h1{font-size:24px}.course-heading .button{padding:6px 11px;font-size:9px}.lesson-path{gap:4px}.lesson-path i{display:none}.lesson-path button{justify-content:center;padding:8px 6px;gap:5px;font-size:10px}.concept-strip{padding:14px 15px 0}.panel-toolbar{padding:11px 15px}.object-lesson{height:223px}.piano-object{width:252px;height:215px;margin-left:50px}.note-experiments{left:0;top:28px}.specimen-note{width:63px;padding:3px 7px}.specimen-note b{font-size:18px}.specimen-note small{font-size:8px}.canvas{padding:8px 11px}.lesson-actionbar .button{font-size:9px;padding:6px 10px}.lesson-actionbar{gap:7px}.lesson-actionbar #pause-button{display:none}.slide-controls{gap:5px!important}.slide-controls button{width:23px;height:23px}.slide-controls>span{font-size:9px}.practice-zone-header{gap:10px}.practice-zone-header p{max-width:180px}.piano-settings .piano-tools{right:-3px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
.reduce-motion *, .reduce-motion *::before,.reduce-motion *::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
/* Press depth and colored light respond to real input and captured playback. */
.piano-key.active,.piano-key.black.active{background:var(--played-color,#e8b953)!important;box-shadow:inset 0 -2px 0 #5559,0 0 18px 3px color-mix(in srgb,var(--played-color,#e8b953) 65%,transparent);filter:saturate(1.2);color:#222}.piano-key.active::after{content:'';position:absolute;left:15%;right:15%;bottom:32px;height:3px;border-radius:50%;background:#fff;box-shadow:0 0 10px 4px var(--played-color,#e8b953)}.piano-key.active kbd{color:#343e2b}.replay-controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap}#replay-position{font-size:11px!important;color:#68755b;margin:14px 0!important;min-height:21px}.replay-key-scroll{overflow:auto;padding:0 2px 9px}.replay-keys{display:flex;position:relative;background:#252620;border:2px solid #252620;border-radius:5px;height:105px;padding-bottom:4px}.replay-key{display:flex;align-items:flex-end;justify-content:center;padding-bottom:8px;font-size:9px;background:#f7f5e8;flex:1;border:1px solid #686b5e;border-radius:0 0 4px 4px;transition:transform .09s,background .09s;min-width:0}.replay-key.black{position:absolute;height:59px;background:#2e3529;color:white;transform:translateX(-50%);z-index:2;font-size:8px;border:1px solid #161b14}.replay-key.active{background:var(--played-color);transform:translateY(3px);box-shadow:0 0 13px var(--played-color)}.replay-key.black.active{transform:translate(-50%,3px);color:#252620}.take-sequence h3{font-size:11px;font-weight:500;margin:20px 0 8px}.take-sequence>p{font-size:13px!important;margin:0!important}.take-notes{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px}.take-note{display:flex;flex-direction:column;min-width:57px;padding:8px 10px;position:relative;border:1px solid #79916d;border-radius:5px;background:#e4ebdc;transition:transform .15s}.take-note small{font-size:8px;color:#65745b}.take-note b{font-size:16px;font-weight:500}.take-note span{font-size:8px;color:#616c57}.take-note.incorrect{background:#f1d8cd;border-color:#bb7456}.take-note.timing-error{background:#eee0b9;border-color:#ae9248}.take-note.playing{transform:translateY(-5px);box-shadow:0 4px 0 #657655;outline:2px solid #465638}.take-details{border-top:1px solid var(--ink);padding-top:14px}.take-details summary{cursor:pointer;font-size:12px}.take-table-wrap{overflow:auto}.take-details table{border-collapse:collapse;width:100%;font-size:11px;margin:15px 0}.take-details th,.take-details td{text-align:left;padding:10px 6px;border-bottom:1px solid #c2c9b7;vertical-align:top}.take-details th{font-weight:500;font-size:10px;white-space:nowrap}.take-details p{font-size:11px!important;margin:10px 0!important}.take-footnote{font-size:10px!important;color:#727c66;margin:20px 0 0!important}.replay-controls .button{font-size:11px}
@media(min-width:901px) and (max-height:850px){.course-heading{padding-top:18px;padding-bottom:13px}.lesson-path{margin-bottom:17px}.object-lesson{height:183px}.piano-object{height:177px;width:240px}.note-experiments{top:15px}.concept-strip{padding-top:13px}.canvas{min-height:170px}.teacher-panel{padding:14px 17px}.tutor-device{height:66px;margin-top:3px;margin-bottom:-6px}.teacher-intro{margin-top:3px;margin-bottom:9px}.suggested-questions{gap:5px;margin-bottom:10px}.suggested-questions button{padding:5px 9px}.teacher-panel #question-form{margin-bottom:9px}.teacher-panel details{padding:8px 0}.piano-section{margin-top:18px}.practice-zone-header{padding:13px 20px}}
.connection-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-bottom:30px}.connection-card{padding:25px;box-shadow:3px 4px 0 #d3d6c9;min-width:0}.connection-card h2{display:flex;gap:12px;align-items:center;font:500 19px var(--sans);margin-bottom:18px}.connection-card h2 span{font:11px var(--mono);padding:5px 7px;background:var(--ink);color:var(--paper);border-radius:4px}.connection-card p{font:12px/1.85 var(--sans);margin:12px 0;color:#6a725e}.connection-card .connection-badge{font:10px/1.8 var(--mono);padding:10px 12px;border:1px solid #c0c8b1;border-radius:5px;background:#e9eddf;margin:15px 0}.connection-card form>label{display:block;font-size:12px;margin:22px 0 8px}.connection-card form input{width:100%;padding:13px 16px;border:1px solid var(--ink);border-radius:5px;background:var(--paper);font-size:13px}.connection-card form .button{margin:6px 0}.connection-card details{margin-top:20px;border-top:1px solid var(--line);padding-top:15px}.connection-card summary{font-size:11px;cursor:pointer}.connection-card .text-button{padding-left:0}.memory-card{grid-column:1/-1}.connection-eyebrow{font:9px var(--mono)!important;letter-spacing:1px}.connection-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.voice-widget{padding:11px 0;border-top:1px solid var(--line)}.voice-widget>.button{font-size:9px;padding:6px 11px;width:100%}.voice-widget>p{font-size:8px;line-height:1.6;color:#717966;margin-top:6px}#voice-controls{display:flex;gap:5px;flex-wrap:wrap}#voice-controls .pill{font-size:8px;padding:4px 7px}.voice-live .device-screen i{animation:voiceWave .7s ease-in-out infinite alternate}.voice-live .device-screen i:nth-child(2n){animation-delay:-.35s}.voice-live .device-screen i:nth-child(3n){animation-delay:-.5s}@keyframes voiceWave{from{transform:scaleY(.4)}to{transform:scaleY(1.3)}}
@media(max-width:760px){.connection-grid{grid-template-columns:1fr}.connection-card{padding:22px}.connection-card h2{font-size:18px}.voice-widget>.button{width:auto;min-width:170px}.memory-card{grid-column:auto}}
.course-heading-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.course-heading-actions .button{font-size:10px}.curriculum-focus{font:10px/1.8 var(--sans);padding:9px 0;border-top:1px solid #b8c3a8;color:#536247}.curriculum-focus .text-button{display:block;padding:3px 0;text-decoration:underline}.curriculum-goal{font:12px/1.8 var(--sans);margin:10px 0;color:#536247}.curriculum-start{margin:18px 0 6px;max-width:100%;text-align:left}.curriculum-source-note{font:10px/1.8 var(--sans)!important;color:#69745e}.curriculum-method,.curriculum-exam{margin:20px 0;border-top:1px solid var(--line);padding-top:15px}.curriculum-method summary,.curriculum-exam summary{font:500 13px/1.8 var(--sans);cursor:pointer}.curriculum-modules{margin:22px 0}.curriculum-module{border:1px solid #9fa88f;border-radius:6px;margin:12px 0;padding:0 16px;background:#f2f3e9}.curriculum-module>summary,.curriculum-lesson>summary{display:flex;align-items:baseline;gap:11px;cursor:pointer;list-style:none;padding:15px 0}.curriculum-module>summary::-webkit-details-marker,.curriculum-lesson>summary::-webkit-details-marker{display:none}.curriculum-module>summary:after,.curriculum-lesson>summary:after{content:'＋';margin-left:auto}.curriculum-module[open]>summary:after,.curriculum-lesson[open]>summary:after{content:'−'}.curriculum-module>summary>span,.curriculum-lesson>summary>span{font:10px var(--mono);color:#6d765f}.curriculum-module>summary>b{font:600 16px/1.6 var(--sans)}.curriculum-module>summary>small,.curriculum-lesson>summary>small{font:9px/1.6 var(--sans);color:#67715d;white-space:nowrap}.curriculum-module>p{font:12px/1.9 var(--sans);margin:0 0 15px}.curriculum-lesson{border-top:1px solid #bdc4b0;scroll-margin-top:20px}.curriculum-lesson>summary>b{font:500 13px/1.7 var(--sans)}.curriculum-lesson-body{padding:0 0 20px}.curriculum-lesson-body section{margin:22px 0}.curriculum-lesson-body h4{font:600 13px/1.7 var(--sans);margin:0 0 8px}.curriculum-lesson-body p,.curriculum-lesson-body li,.curriculum-method p,.curriculum-method li,.curriculum-exam p,.curriculum-exam li{font:13px/1.95 var(--sans)}.curriculum-lesson-body ul,.curriculum-lesson-body ol,.curriculum-method ul,.curriculum-exam ul,.curriculum-exam ol{padding-left:22px;margin:8px 0}.curriculum-lesson-body li{margin:6px 0}.curriculum-prerequisites{font-size:10px!important;color:#67715d;border-bottom:1px dashed #b9c2ab;padding-bottom:12px}.curriculum-prerequisites button{font-size:10px;display:inline;text-decoration:underline;padding:0}.curriculum-checks{background:#e5ebd9;padding:15px;border-radius:4px}.curriculum-checks>p{font-size:10px}.curriculum-checks details{margin:12px 0}.curriculum-checks summary{font-size:11px;cursor:pointer}.curriculum-next-hint{font-size:11px!important;font-weight:600!important}.curriculum-actions,.curriculum-navigation{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.curriculum-actions .button,.curriculum-navigation .button{font-size:10px;text-align:left}.curriculum-navigation{margin-top:18px;border-top:1px solid #bdc4b0;padding-top:15px;justify-content:space-between}.curriculum-exam h3{font:600 14px var(--sans);margin-top:20px}.curriculum-exam small{font-size:10px;color:#69745e}
@media(max-width:600px){.course-heading-actions{max-width:180px;gap:5px}.course-heading-actions .button{font-size:9px;padding:6px 9px}.curriculum-module{padding:0 12px}.curriculum-module>summary>b{font-size:14px}.curriculum-lesson>summary{gap:8px;flex-wrap:wrap}.curriculum-lesson>summary>b{flex:1}.curriculum-lesson>summary>small{display:none}.curriculum-actions .button,.curriculum-navigation .button{max-width:100%;font-size:10px}.curriculum-start{font-size:11px;line-height:1.8}}