:root{--bg:#091221;--surface:#101d30;--surface2:#17283f;--line:#2a3b51;--txt:#f3f6fc;--muted:#a5b3c8;--gold:#f3b64d;--green:#50d9ac;--red:#ff8b90}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--txt);font:15px/1.6 system-ui,-apple-system,Segoe UI,Arial,sans-serif}button,input,select{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.shell{min-height:100vh;display:flex}.sidebar{width:254px;background:#0d192a;border-right:1px solid var(--line);padding:26px 16px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;flex-shrink:0}.brand{display:flex;align-items:center;gap:10px;font-weight:850;font-size:27px;letter-spacing:-1px;margin:0 9px 36px}.brand 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p{color:#c5d1df;max-width:570px}.hero-art{font-size:108px;text-align:center;filter:drop-shadow(0 12px 22px #0008)}.sectionhead{display:flex;align-items:end;justify-content:space-between;gap:12px;margin:35px 0 16px}.sectionhead h2,.pagehead h1{margin:0;font-size:clamp(24px,3vw,32px);line-height:1.2;letter-spacing:-.6px}.pagehead p{color:var(--muted);margin:8px 0 26px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;min-width:0}.card h3{margin:0 0 9px;font-size:18px}.card p{color:var(--muted);margin:6px 0}.metric{font-size:34px;font-weight:850;letter-spacing:-1px}.muted{color:var(--muted)}.btn{background:var(--gold);color:#1b1c20;border:1px solid var(--gold);border-radius:11px;padding:12px 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12px;font-size:12px;margin-top:10px}.weektitle{margin:34px 0 14px;color:var(--gold);font-size:17px}.lesson{max-width:900px}.lesson .card{margin:14px 0}.lesson h2{margin:0 0 8px}.lesson .content{font-size:17px;line-height:1.9}.quiz-options{display:grid;gap:10px;margin:14px 0}.quiz-options button{background:#192b42;border:1px solid #3c516a;color:#e7edf7;border-radius:11px;text-align:left;padding:13px 16px}.quiz-options button.selected{border-color:var(--gold);background:#493b26}.quiz-options button.correct{border-color:var(--green);background:#173f37}.quiz-options button.wrong{border-color:var(--red);background:#462c39}.feedback{padding:12px 14px;border-radius:10px;background:#193449;color:#e2f0ff;margin-top:12px}.tool-controls{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}.tool-controls label{display:grid;gap:5px;color:var(--muted);font-size:12px;font-weight:700}select,input[type=text],input[type=number]{background:#14253a;border:1px solid #455c74;border-radius:9px;color:white;padding:10px 12px;min-width:135px;max-width:100%}.fretwrap{overflow-x:auto;padding:8px 0 15px}.fret{border-collapse:collapse;width:100%;min-width:660px;table-layout:fixed}.fret th{font-size:11px;color:var(--muted);font-weight:650;padding:5px}.fret td{height:53px;border-right:3px solid #a3a9b2;border-top:1px solid #64748b;border-bottom:1px solid #64748b;text-align:center;position:relative;background:linear-gradient(#72503c,#654632);padding:0}.fret td:first-child{border-right:6px solid #d6d9d9;background:#203348}.fret td:last-child{border-right:1px solid #a3a9b2}.note{width:35px;height:35px;display:inline-grid;place-items:center;border-radius:50%;font-size:11px;font-weight:800;color:#243145;background:#e5e9ed;border:2px solid 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10px 30px #0008;opacity:0;pointer-events:none;transition:opacity .25s;max-width:330px;z-index:50}.toast.show{opacity:1}.checkrow{display:flex;align-items:center;gap:9px;margin:12px 0}.checkrow input{accent-color:var(--gold);width:19px;height:19px}.trainer-answer{font-size:25px;font-weight:900;color:var(--gold)}.statsline{display:flex;gap:8px;flex-wrap:wrap}.statsline span{background:#20354a;padding:5px 10px;border-radius:9px;font-size:12px}.hidden{display:none!important}@media(max-width:1000px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-art{font-size:76px}}@media(max-width:760px){.sidebar{position:fixed;z-index:20;transform:translateX(-105%);transition:transform .2s;box-shadow:12px 0 30px #0007}.sidebar.open{transform:translateX(0)}.iconbtn,.topbrand{display:inline}.topbar{padding:0 16px;height:64px}.topright{display:none}.pill{font-size:10px;padding:5px 8px}main{padding:23px 16px 55px}.hero{grid-template-columns:1fr;padding:23px}.hero-art{display:none}.grid,.grid.two{grid-template-columns:1fr}.sectionhead{margin-top:26px}.card{padding:17px}.shopitem{align-items:start}.shopemoji{font-size:35px;padding:10px}footer{padding:14px 16px}.actions .btn{flex:1}.fret td{height:46px}.note{height:30px;width:30px;font-size:10px}}