.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.workspace{min-width:0}.instructions{padding:22px 24px;margin-bottom:20px;background:white;border:1px solid var(--line);border-radius:18px}
.instructions h2{font-size:19px;letter-spacing:-.3px}.instructions>p{font-size:16px;max-width:760px;margin-bottom:14px}
.instructions .guide-steps{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:16px 0 18px}.instructions .guide-steps li{font-size:15px;align-items:flex-start;gap:9px}.instructions .guide-steps li>span{width:25px;height:25px;font-size:13px}
.reference>summary{cursor:pointer;font-size:14px;font-weight:650;color:var(--accent);line-height:1.5;min-height:44px;display:list-item;padding:12px 0;outline-offset:4px}.reference>summary:focus-visible,.module-menu>summary:focus-visible{outline:3px solid #e08000}
.reference .demo-box{margin-top:8px}.reference .demo-box>p{font-size:15px}.module-menu{margin-top:4px}.module-menu>summary{cursor:pointer;padding:12px;min-height:46px;font-size:15px;font-weight:650}
.level-bar .segmented button{min-height:48px;padding:12px 20px;font-size:16px}.level-bar .segmented{flex-shrink:0}.play-panel{scroll-margin-top:20px}.contour{height:auto;max-width:280px;aspect-ratio:2.4}
.notation-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));background:none;padding:16px;gap:12px}.sign-choice{width:100%;max-width:none;min-height:118px}.notation-row:has(>button:nth-child(3):last-child){grid-template-columns:repeat(3,minmax(0,1fr))}
.sign-rhythm .rhythm-tile{min-height:112px}.token-audio{min-height:44px;font-size:14px}.back{min-height:44px;align-items:center}.conductor-controls .segmented button{min-height:48px}
.site-footer{font-size:14px}.site-footer a{padding:10px 0}.sources a{padding-block:3px}.audio-status button{min-height:44px;font-size:14px}.brand{flex-shrink:0}
.conductor-controls.technical .segmented button{font-size:15px;line-height:1.5;padding:12px 6px;white-space:normal}
.achievement{text-align:left;margin-top:24px;overflow-wrap:anywhere}.achievement-intro,.achievement-limit{font-size:15px;line-height:1.6}.achievement-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:22px 0}.achievement-stats>div{background:var(--tint);border-radius:12px;padding:16px;min-width:0}.achievement-stats dt{font-size:13px;line-height:1.4}.achievement-stats dd{font-size:26px;font-weight:750;margin:8px 0 0;color:var(--accent)}.achievement section{margin:26px 0}.achievement h3{font-size:19px;line-height:1.4;margin-bottom:14px}.achievement ul{list-style:none;padding:0}.achievement li{font-size:15px;line-height:1.6}.achievement-tasks li{display:flex;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding:12px 0}.achievement-tasks b{flex-shrink:0}.achievement-skills{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.achievement-skills li{border:1px solid var(--line);border-radius:12px;padding:16px}.achievement-skills span,.achievement-skills small{display:block;margin-top:7px}.achievement-skills small{font-size:14px;color:#5b6780}.achievement-practice{padding:20px;background:#f1f6fc;border-radius:14px}.achievement-practice ol{padding-left:22px}.achievement-practice li+li{margin-top:18px}.achievement-practice p{font-size:15px;line-height:1.6;margin-top:5px}.achievement-limit{border-top:1px solid var(--line);padding-top:16px}
@media(max-width:620px){.achievement-skills{grid-template-columns:1fr}.achievement-stats{gap:8px}.achievement-stats>div{padding:12px 8px}.achievement-stats dt{font-size:12px}.achievement-stats dd{font-size:23px}.achievement-tasks li{flex-direction:column;gap:4px}.achievement-practice{padding:16px}}
.achievement-stats>div{display:flex;flex-direction:column;justify-content:space-between;gap:12px;min-height:124px}.achievement-stats dt{font-size:14px}.achievement-stats dd{font-variant-numeric:tabular-nums;line-height:1.15;margin:0}.achievement-skill-score{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:12px;margin:14px 0;padding:12px 0;border-block:1px solid var(--line)}.achievement-skill-score>span,.achievement-skill-score small{margin:0}.achievement-skill-score strong{font-size:24px;line-height:1.15;font-variant-numeric:tabular-nums;white-space:nowrap;text-align:right;color:var(--accent);min-width:3.8ch}
@media(max-width:620px){.achievement-stats{grid-template-columns:1fr}.achievement-stats>div{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;min-height:72px;padding:14px 16px;gap:16px}.achievement-stats dt{font-size:15px}.achievement-stats dd{font-size:28px;text-align:right;min-width:3.8ch;white-space:nowrap}}
@media(max-width:620px){.conductor-controls.technical .segmented{display:grid;grid-template-columns:1fr}.conductor-controls.technical .segmented button{font-size:16px;min-height:48px}}
@media(min-width:761px){.module-menu>summary{display:none}}
@media(max-width:1000px){.instructions .guide-steps{grid-template-columns:1fr;gap:10px}.instructions{padding:20px}.level-bar{align-items:stretch}.level-bar .segmented{width:fit-content}}
@media(max-width:760px){
 .side-nav{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:8px;margin-bottom:12px;padding-top:0}.side-nav .back{margin:0}.module-menu{margin:0;max-width:100%}.module-menu[open]{width:100%}.module-menu>summary{text-align:right;padding:12px 4px}
 .side-nav nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));overflow:visible;gap:6px}.side-nav nav a{max-width:none;min-height:48px;font-size:14px;padding:12px;background:#eef1f7}
 .module-heading{margin-top:12px;margin-bottom:16px}.module-heading h1{font-size:clamp(26px,6vw,34px)}.instructions{padding:18px}.instructions .guide-steps li{font-size:15px}.instructions .guide-steps{margin:14px 0;gap:10px}
 .level-bar{gap:10px}.level-bar .segmented{width:100%;display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.level-bar .segmented button{min-width:0;padding:12px 8px}
 .module-grid{gap:16px}.module-card>p:not(.eyebrow){min-height:0}.card-top{margin-bottom:16px}.module-card{padding:22px}.module-card .button{min-height:50px}
 .audio-status:not(:empty){position:sticky;top:0;z-index:20;margin:0;border-radius:0;font-size:14px;padding:8px 14px;box-shadow:0 2px 8px #18223b12}.play-panel{scroll-margin-top:72px}
 .rhythm-strip{gap:6px}.rhythm-tile small{font-size:12px}.token-bank{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.token-bank:has(>div:nth-child(2):last-child){grid-template-columns:repeat(2,minmax(0,1fr))}.token-bank>div{min-width:0;max-width:none}.token{min-width:0;max-width:none;width:100%;font-size:14px}.token-audio{white-space:normal;line-height:1.4}
 .question-title{font-size:24px}.task-top{font-size:12px;letter-spacing:.8px}.progress-dots i{width:22px}.symbol-legend span{font-size:14px}.complete-actions>*{width:100%}
}
@media(max-width:450px){
 main{padding:18px 12px}.topbar{padding:14px 12px}.brand{gap:8px;font-size:17px}.brand-mark{width:40px;height:40px}.topbar button{font-size:14px;min-height:46px}.intro h1{font-size:38px}.intro{margin-bottom:24px}
 .play-panel{padding:20px 14px}.instructions{padding:16px}.question-title{font-size:22px}.audio-pair{grid-template-columns:1fr}.listen{min-height:52px;font-size:16px;padding:13px 14px}.demo-buttons .listen{font-size:14px;min-height:46px}
 .notation-row{padding:8px;gap:8px;grid-template-columns:repeat(2,minmax(0,1fr))}.notation-row:has(>button:nth-child(3):last-child){grid-template-columns:repeat(3,minmax(0,1fr))}.sign-choice{padding:8px;min-height:104px}.sign-choice .note-symbol{width:58px;max-width:100%}
 .conductor-controls .segmented button{padding:12px 5px;font-size:14px}.task-controls{flex-wrap:wrap}.task-controls .primary{flex:1;min-width:145px}.task-controls button{min-height:48px}.instrument-image{height:120px}.contour{max-width:none}.library-image{height:100px}
 .rhythm-tile .note-symbol{width:100%;max-width:50px}.rhythm-tile{min-width:0}.rhythm-tile small{overflow-wrap:anywhere}.rhythm-tile .empty-note{height:56px}.token .note-symbol{width:55px}
}
@media(max-width:340px){.brand{font-size:15px}.brand-mark{width:35px;height:35px}.topbar{gap:6px}.topbar button{font-size:13px;padding:10px 8px}.play-panel{padding:18px 10px}.instructions{padding:14px}.side-nav nav{grid-template-columns:1fr}}