:root {
    --bg: #f2f3f0;
    --surface: #ffffff;
    --ink: #1b1d1c;
    --muted: #666b67;
    --line: #d5d8d3;
    --line-strong: #a9aea9;
    --accent: #1f7a62;
    --accent-soft: #d8ede5;
    --off: #b83a2a;
    --warn: #b8731a;
    --warn-soft: #f3e4cf;
    --needle: #1b1d1c;
    --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    --sans: "IBM Plex Sans", -apple-system, "Helvetica Neue", Arial, sans-serif;
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --bg: #151716; --surface: #1e2120; --ink: #ecede9; --muted: #9ba19c;
      --line: #343836; --line-strong: #5a605c;
      --accent: #4fc39f; --accent-soft: #1d3a31; --warn: #e0a457; --warn-soft: #3d2f1a;
      --needle: #ecede9; --off: #e0665a;
    }
  }
  :root[data-theme="dark"] {
    --bg: #151716; --surface: #1e2120; --ink: #ecede9; --muted: #9ba19c;
    --line: #343836; --line-strong: #5a605c;
    --accent: #4fc39f; --accent-soft: #1d3a31; --warn: #e0a457; --warn-soft: #3d2f1a;
    --needle: #ecede9; --off: #e0665a;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0; background: var(--bg); color: var(--ink);
    font-family: var(--sans); font-size: 15px; line-height: 1.45;
    -webkit-font-smoothing: antialiased;
  }
  main { max-width: 640px; margin: 0 auto; padding: 20px 16px 60px; display: grid; gap: 22px; }
  header { display: flex; justify-content: flex-end; }
  .eyebrow { font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
  select, input, button, textarea { font: inherit; color: inherit; }
  select, input[type="text"], input[type="number"], textarea {
    background: var(--surface); border: 1px solid var(--line-strong); border-radius: 6px;
    padding: 8px 10px; width: 100%;
  }
  input[type="number"] { font-family: var(--mono); font-variant-numeric: tabular-nums; }
  textarea { font-family: var(--mono); font-size: 12px; min-height: 120px; }
  button {
    background: var(--surface); border: 1px solid var(--line-strong); border-radius: 6px;
    padding: 9px 14px; cursor: pointer;
  }
  button.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
  button.ghost { border-color: transparent; background: transparent; color: var(--muted); }
  button:focus-visible, select:focus-visible, input:focus-visible, textarea:focus-visible {
    outline: 2px solid var(--accent); outline-offset: 1px;
  }
  button[disabled] { opacity: 0.5; cursor: default; }

  /* Selector de afinación */
  .tuning-select { display: grid; gap: 6px; }
  .tuning-select select { font-weight: 500; }
  .tuning-meta { color: var(--muted); font-size: 13px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; min-height: 1.4em; }
  .tuning-meta input { width: 7em; padding: 4px 8px; }
  .tuning-meta button { padding: 5px 10px; font-size: 13px; }

  /* Cuerdas */
  .strings { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; }
  .string {
    display: grid; padding: 10px 4px; text-align: center;
    border: 1px solid var(--line); border-radius: 6px; background: var(--surface);
    cursor: pointer; user-select: none; min-width: 0;
  }
  .string .n { font-family: var(--mono); font-size: 18px; }
  .string.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
  .string.locked { background: var(--ink); color: var(--bg); }
  .string.playing { background: var(--accent-soft); border-color: var(--accent); color: var(--ink); }

  /* Medidor */
  .meter { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 16px 16px 12px; display: grid; gap: 10px; }
  .readout { display: grid; justify-items: center; text-align: center; gap: 4px; }
  .readout .cents { font-family: var(--mono); font-size: 44px; font-weight: 500; line-height: 1; font-variant-numeric: tabular-nums; }
  .readout .cents small { font-size: 16px; color: var(--muted); font-weight: 400; margin-left: 4px; }
  .readout .freq { font-family: var(--mono); font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; }
  .readout .target { font-family: var(--mono); font-size: 22px; font-weight: 500; font-variant-numeric: tabular-nums; color: var(--off); }
  .readout .target #targetNote { font-size: 14px; font-weight: 400; }
  .meter.in-tune .target { color: var(--accent); }
  .readout .freq b { color: var(--ink); font-weight: 500; }
  .meter.in-tune .cents { color: var(--accent); }
  svg.scale { width: 100%; height: auto; display: block; }
  .status { font-size: 13px; color: var(--muted); min-height: 1.4em; }
  .status.err { color: var(--warn); }
  .controls { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; justify-content: center; }
  .controls label { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
  .controls input[type="checkbox"] { width: auto; }

  /* Biblioteca */
  details { border-top: 1px solid var(--line); padding-top: 12px; }
  summary { cursor: pointer; font-weight: 500; }
  .form { display: grid; gap: 12px; margin-top: 12px; }
  .row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
  .field { display: grid; gap: 4px; }
  .field label { font-size: 12px; color: var(--muted); }
  .modes { display: flex; gap: 0; border: 1px solid var(--line-strong); border-radius: 6px; overflow: hidden; }
  .modes button { flex: 1; border: 0; border-radius: 0; background: transparent; padding: 8px; }
  .modes button.on { background: var(--ink); color: var(--bg); }
  table.entry { width: 100%; border-collapse: collapse; }
  table.entry td, table.entry th { padding: 4px 4px; text-align: left; font-size: 13px; }
  table.entry th { color: var(--muted); font-weight: 500; font-size: 12px; }
  table.entry td.n { font-family: var(--mono); color: var(--muted); width: 2em; }
  table.entry td.prev { font-family: var(--mono); font-variant-numeric: tabular-nums; color: var(--muted); white-space: nowrap; font-size: 12px; }
  table.entry select, table.entry input { padding: 6px 8px; }
  .help { font-size: 12px; color: var(--muted); }
  .actions { display: flex; gap: 8px; flex-wrap: wrap; }
  .lib-list { display: grid; gap: 6px; margin-top: 12px; }
  .lib-item { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); }
  .lib-item .name { font-weight: 500; }
  .lib-item .src { font-size: 12px; color: var(--muted); }
  .lib-item .tag { font-size: 11px; color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; }
  @media (prefers-reduced-motion: no-preference) {
    #needle { transition: transform 220ms linear; }
  }

[hidden] { display: none !important; }

.sens { display: grid; grid-template-columns: auto 1fr auto; gap: 10px; align-items: center; font-size: 12px; color: var(--muted); }
.sens input[type="range"] { width: 100%; accent-color: var(--ink); }
.sens output { font-family: var(--mono); font-variant-numeric: tabular-nums; min-width: 6ch; text-align: right; }
.sens select { padding: 5px 8px; font-size: 13px; }