:root{--bg: #12100e;--panel: #1b1815;--line: #302a25;--ink: #f0e9e1;--dim: #a2968a;--accent: #e2a03f;--good: #6fbf73;--bad: #d9605a;color-scheme:dark}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 ui-sans-serif,-apple-system,Segoe UI,system-ui,sans-serif}.app{max-width:960px;margin:0 auto;padding:28px 20px 80px}header{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:20px}h1{font-size:24px;margin:0;letter-spacing:-.02em}.sub{margin:4px 0 0;color:var(--dim);font-size:14px}nav{display:flex;gap:6px;flex-wrap:wrap}nav button{background:transparent;border:1px solid var(--line);color:var(--dim);padding:7px 12px;border-radius:999px;font-size:13px;cursor:pointer}nav button.on{color:var(--ink);border-color:var(--accent);background:#241d13}nav button:disabled{opacity:.35;cursor:default}.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px}.warn{border:1px solid #4a3a1c;background:#241d13;color:#e8d8bd;padding:12px 14px;border-radius:10px;margin-bottom:18px;font-size:14px}.warn.error{border-color:#4a2523;background:#2a1918;color:#f0cac8}.warn pre{white-space:pre-wrap;margin:8px 0;font-size:12px}.meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}.pill{border:1px solid var(--line);border-radius:999px;padding:3px 10px;font-size:12px;color:var(--dim)}.rationale{color:var(--dim);font-size:13px;margin:0 0 18px}.rail{display:flex;gap:6px;list-style:none;padding:0;margin:0 0 20px;flex-wrap:wrap}.rail li{font-size:12px;color:var(--dim);border-bottom:2px solid var(--line);padding:0 10px 6px;flex:1;min-width:90px}.rail li.here{color:var(--accent);border-color:var(--accent)}.rail li.done{color:var(--good);border-color:var(--good)}.card{border:1px solid var(--line);border-radius:12px;padding:20px}.card h2{margin:0 0 12px;font-size:15px;color:var(--dim);font-weight:600}.prompt{font-size:17px;line-height:1.5;margin:0 0 18px;max-width:60ch}.hint{color:var(--bad);font-size:14px}.stub-note{border-left:2px solid var(--accent);padding-left:12px;color:var(--dim);font-size:14px;margin-bottom:18px}button.primary,button.ghost,button.play{font:inherit;cursor:pointer;border-radius:9px;padding:9px 16px}button.primary{background:var(--accent);border:none;color:#1a1206;font-weight:600}button.primary:disabled{background:#3a332a;color:#7c7166;cursor:default}button.ghost{background:transparent;border:1px solid var(--line);color:var(--dim)}button.play{background:transparent;border:1px solid var(--line);color:var(--ink);font-size:13px;padding:6px 12px}.row,.plans{display:flex;gap:10px;flex-wrap:wrap}.signin{max-width:420px;margin:0 auto;padding:64px 20px}.signin h1{font-size:32px}.signin .panel{margin-top:24px;display:grid;gap:14px}.signin h2{margin:0;font-size:18px}.signin form{display:grid;gap:10px}.signin label{font-size:13px;color:var(--dim)}button.google{font:inherit;font-weight:600;cursor:pointer;padding:11px 16px;border-radius:9px;background:var(--ink);color:var(--bg);border:none}.or{display:flex;align-items:center;gap:10px;color:var(--dim);font-size:12px}.or:before,.or:after{content:"";flex:1;border-top:1px solid var(--line)}.fine{color:var(--dim);font-size:13px;margin:10px 0 0}.signin .brand{color:var(--accent);font-weight:700;text-decoration:none}.signin h1{margin-top:18px}input.code{font-size:24px;letter-spacing:.4em;text-align:center;font-variant-numeric:tabular-nums}.soon{border-left:2px solid var(--accent);padding-left:12px}.fine a{color:var(--ink)}input{font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:9px;padding:10px 12px}input:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.song-form{display:grid;grid-template-columns:2fr 1.4fr auto;gap:10px}@media(max-width:640px){.song-form{grid-template-columns:1fr}}.app>.panel+.panel,.app>section+section{margin-top:18px}.plans-panel h2{margin:0 0 6px;font-size:18px}.plans-panel p{margin:0 0 14px}.lesson-list{list-style:none;padding:0;margin:10px 0 0;display:grid;gap:6px}button.link{font:inherit;background:none;border:none;padding:0;cursor:pointer;color:var(--ink);text-decoration:underline;text-underline-offset:3px}.panel>h2{margin:0;font-size:15px;color:var(--dim);font-weight:600}.save{margin-left:6px;padding:2px 7px;border-radius:999px;background:#1a1206;color:var(--accent);font-size:12px;font-weight:700}.diagrams{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:18px}.diagram-cell{display:flex;flex-direction:column;align-items:center;gap:6px}.diagram-pick{background:transparent;border:1px solid var(--line);border-radius:12px;padding:4px;cursor:pointer}figure.diagram{margin:0;text-align:center}figure.diagram figcaption{display:block;font-size:12px;color:var(--dim)}figure.diagram figcaption strong{display:block;color:var(--ink);font-size:13px}.pitches{font-family:ui-monospace,monospace;font-size:10px;letter-spacing:.02em}svg .fret,svg .string{stroke:#4c443c;stroke-width:1}svg .nut{fill:var(--ink)}svg .dot{fill:var(--accent)}svg .finger{fill:#1a1206;font-size:10px;font-weight:700}svg .open{fill:none;stroke:var(--dim);stroke-width:1.5}svg .mark.mute{fill:var(--dim);font-size:12px}svg .fretnum{fill:var(--dim);font-size:11px}.match{display:flex;gap:24px;flex-wrap:wrap;margin-bottom:18px}.match-col{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}.chip{font:inherit;background:transparent;border:1px solid var(--line);color:var(--ink);border-radius:9px;padding:8px 16px;cursor:pointer}.chip.big{font-size:16px;padding:12px 22px}.chip.sel{border-color:var(--accent)}.chip.right{border-color:var(--good);color:var(--good)}.chip.wrong{border-color:var(--bad);color:var(--bad)}.options{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}.slots{display:flex;gap:8px;list-style:none;padding:0;margin:0;counter-reset:s}.slots li{flex:1;min-width:64px;text-align:center;padding:14px 6px;border:1px dashed var(--line);border-radius:9px;color:var(--dim)}.slots li.filled{border-style:solid;color:var(--ink)}.slots li.right{border-color:var(--good);color:var(--good);border-style:solid}.slots li.wrong{border-color:var(--bad);color:var(--bad);border-style:solid}.playbar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:20px;padding-top:16px;border-top:1px solid var(--line)}.playbar label{font-size:12px;color:var(--dim);display:flex;gap:8px;align-items:center}.playbar .note{font-size:12px;color:var(--dim);margin-left:auto}.empty{text-align:center;padding:30px 10px}.empty p{color:var(--dim);max-width:56ch;margin:0 auto 18px}.working{color:var(--accent)!important}.log,pre{font-family:ui-monospace,monospace;font-size:12px;color:var(--dim);white-space:pre-wrap;text-align:left}.log-details{margin-bottom:18px;color:var(--dim);font-size:13px}.report h2{font-size:18px;margin:0 0 18px}.layer{border:1px solid var(--line);border-radius:12px;padding:16px;margin-bottom:14px}.layer.ok{border-left:3px solid var(--good)}.layer.bad{border-left:3px solid var(--bad)}.layer h3{margin:0 0 6px;font-size:15px;display:flex;gap:10px;align-items:baseline}.layer h3 em{color:var(--dim);font-style:normal;font-size:13px}.tag{font-family:ui-monospace,monospace;color:var(--accent)}.blurb{color:var(--dim);font-size:13px;margin:0 0 12px;max-width:70ch}.clean{color:var(--good);font-size:14px;margin:0}.diffs{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}.diffs li{border-left:2px solid var(--bad);padding-left:12px;font-size:14px}.diffs li.advisory{border-color:var(--dim);color:var(--dim)}.diffs code{color:var(--accent);margin-right:8px;font-size:13px}.sides{font-family:ui-monospace,monospace;font-size:12px;color:var(--dim);margin-top:4px}.sides b{color:var(--ink);margin-right:6px}.billing{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--dim)}