:root{--bg:#ffffff;--panel:#171924;--ink:#0d0f16;--muted:#5c637a;--accent:#4fb3ff;--accent-2:#8ef1a7;--danger:#ff6b6b;--fret:#000000;--string:#000000;--note:#ffffff;--note-bad:#ff6b6b;--dot:#c2b59b;--good:#46d38a;--board:#e7d9bd}*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.4 system-ui,-apple-system,Segoe UI,Roboto,Arial}button{cursor:pointer}.app-header{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;background:var(--panel);border-bottom:1px solid #202437;position:sticky;top:0;z-index:5}.brand{display:flex;align-items:center;gap:10px}.brand-copy{display:flex;flex-direction:column;gap:2px}.app-header h1{font-size:16px;margin:0;color:#e9eef6}.trainer-purpose{margin:0;color:#cfd7e3;font-size:12px;line-height:1.25;max-width:520px}.header-actions{display:flex;align-items:center;gap:4px;flex-shrink:0}.icon-btn{display:inline-grid;place-items:center;border:1px solid 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