:root{--bg:#111412;--panel:#1b1f1c;--line:#343b33;--muted:#98a293;--lime:#d4f892;--text:#f1f3e9}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px 'Leelawadee UI',Tahoma,sans-serif}button,input,select{font:inherit}button,a,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--lime);outline-offset:4px}aside{width:235px;position:fixed;height:100vh;border-right:1px solid var(--line);padding:37px 25px;display:flex;flex-direction:column}.brand{font-size:29px;font-weight:750;letter-spacing:-1px;color:var(--text);text-decoration:none;display:flex;gap:11px}.lime{color:var(--lime)}small,.eyebrow{font-size:10px;letter-spacing:1.6px;color:var(--muted)}aside>small{font-size:8px;letter-spacing:1.1px;margin:14px 0 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var(--line);border-radius:6px;color:var(--text);padding:8px 12px}.actions{display:flex;gap:8px;margin-top:20px}.primary,.secondary{border-radius:7px;padding:11px 16px;border:0}.primary{background:var(--lime);color:#233119;font-weight:600}.primary:hover{background:#e7ffb9}.secondary{background:transparent;border:1px solid #46503f;color:var(--text)}.hint{font-size:11px;line-height:1.8;margin-bottom:0}.tempo{text-align:center;margin:25px 0 18px}.tempo input{width:100%;background:none;border:0;color:var(--text);text-align:center;font-size:76px;line-height:1;appearance:textfield;outline-offset:0}.tempo input::-webkit-inner-spin-button{display:none}.tempo span{color:var(--muted);font-size:11px;letter-spacing:3px}input[type=range]{accent-color:var(--lime);width:100%}.beats{display:flex;justify-content:center;gap:12px;margin:24px 0}.beat{width:14px;height:14px;border-radius:50%;background:#3f483a;transition:background .06s}.beat.on{background:var(--lime);box-shadow:0 0 15px #d4f89244}.metro .controls{margin-bottom:20px}.wide{width:100%;margin-top:9px}.bottom-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:20px 0}.tip{background:radial-gradient(ellipse at top right,#34432a 0,transparent 70%),var(--panel)}.tip p{max-width:650px;font-size:13px}.timer-row{display:flex;gap:10px;align-items:center}.timer-row strong{font-size:31px;font-weight:500;margin-right:auto;font-variant-numeric:tabular-nums}#timer-status{font-size:11px;color:var(--lime)}footer{border-top:1px solid var(--line);margin-top:30px;padding:25px 0;display:flex;gap:25px;font-size:12px;color:var(--muted)}footer span:last-child{margin-left:auto}.lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:20px}.lesson-grid button{text-align:left;color:var(--text)}.lesson-grid button:hover{border-color:var(--lime)}.lesson-grid h2{font-size:18px}.lesson-grid p{font-size:12px}.badge{color:var(--lime);font-size:11px}.lesson-body{max-width:800px;line-height:2;color:#c8d0c1}.history-row{display:flex;justify-content:space-between;padding:16px 0;border-bottom:1px solid var(--line);color:var(--muted)}[hidden]{display:none!important}@media(min-width:1600px){.string{height:48px}}@media(max-width:1150px){aside{width:190px;padding:30px 18px}main{margin-left:190px;padding:0 24px}.studio-grid{grid-template-columns:minmax(0,1fr)}.metro{display:block}.tempo{margin:8px 0}.tempo input{font-size:52px}.metro .controls{margin-top:15px}.lesson-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:650px){aside{position:static;width:auto;height:auto;padding:18px;border-right:0;border-bottom:1px solid var(--line)}aside>small,.side-bottom{display:none}nav{display:flex;margin-top:18px;gap:3px}.nav{font-size:12px;padding:10px}.brand{font-size:25px}main{margin:0;padding:0 16px}header{height:56px}.pill{display:none}.intro{padding:28px 0 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.sound-panel{margin-bottom:20px}.sound-controls{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:22px;align-items:center}.sound-controls output{color:var(--lime);font-variant-numeric:tabular-nums}.sound-controls input{margin:0}@media(max-width:800px){.sound-controls{grid-template-columns:1fr 1fr;gap:16px}.sound-panel .card-head{flex-wrap:wrap;margin-bottom:15px}}