:root{--paper: #f6f3ec;--stage: #efeae0;--ink: #201d18;--muted: #9d968a;--spent: #c3bcae;--line: #ded7c8;--accent: #2f6d5b;--accent-ink: #fff;--glow: #c67a12;--glow-bg: #f6d9a4;--panel: #fbf9f4;--shadow: 0 1px 2px rgba(32,29,24,.06), 0 8px 24px rgba(32,29,24,.05);--stage-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;--sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace}@media(prefers-color-scheme:dark){:root{--paper: #101613;--stage: #16201c;--ink: #e6ede9;--muted: #5f7068;--spent: #3f544c;--line: #223029;--accent: #63c9a6;--accent-ink: #0c1512;--glow: #f6b64a;--glow-bg: #33291a;--panel: #131b17;--shadow: 0 1px 2px rgba(0,0,0,.4), 0 10px 30px rgba(0,0,0,.35)}}:root[data-theme=light]{--paper: #f6f3ec;--stage: #efeae0;--ink: #201d18;--muted: #9d968a;--spent: #c3bcae;--line: #ded7c8;--accent: #2f6d5b;--accent-ink: #fff;--glow: #c67a12;--glow-bg: #f6d9a4;--panel: 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ease}.play:hover{transform:scale(1.05)}.play:active{transform:scale(.96)}.play svg{width:22px;height:22px}.rail{margin-top:26px}.rail-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:12px}.rail-head h2{font-family:var(--stage-serif);font-size:18px;margin:0;font-weight:600}.beats{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px}.beat{text-align:left;border:1px solid var(--line);border-radius:14px;background:var(--panel);padding:14px 15px;cursor:pointer;display:flex;gap:12px;align-items:flex-start;transition:border-color .12s ease,transform .08s ease}.beat:hover{transform:translateY(-2px);border-color:var(--accent)}.beat[aria-current=true]{border-color:var(--accent);box-shadow:0 0 0 2px var(--glow-bg)}.beat .n{flex-shrink:0;width:26px;height:26px;border-radius:50%;background:var(--stage);border:1px solid 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summary .chev{transform:rotate(90deg)}summary .hint{color:var(--muted);font-weight:400;font-size:12px}summary .keydot{margin-left:auto;display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:600;color:var(--muted)}summary .keydot i{width:8px;height:8px;border-radius:50%;background:var(--spent)}summary .keydot[data-on=true]{color:var(--accent)}summary .keydot[data-on=true] i{background:var(--accent);box-shadow:0 0 0 3px var(--glow-bg)}.panel-body{padding:0 16px 16px}.keyhint{color:var(--muted);font-size:12px;margin:0 0 8px;line-height:1.5}.keyhint a{color:var(--accent)}.keyrow{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.vsel{border:1px solid var(--line);background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:12px;font-weight:600;border-radius:999px;padding:8px 30px 8px 13px;cursor:pointer;-webkit-appearance:none;appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 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