:root {
  --bg: #0f1216;
  --panel: #171b21;
  --panel-2: #1e242c;
  --border: #2a313b;
  --text: #e8ecf1;
  --muted: #8a94a3;
  --accent: #f5b942;
  --accent-2: #4fd1c5;
  --danger: #ef6a6a;
  --paper: #fbfaf6;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
}

.brand { display: flex; align-items: baseline; gap: 12px; }
.brand .logo { font-size: 28px; color: var(--accent); }
.brand h1 { margin: 0; font-size: 20px; font-weight: 600; letter-spacing: 0.2px; }
.brand .tagline { color: var(--muted); font-size: 13px; }

.actions { display: flex; gap: 8px; flex-wrap: wrap; }

button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
button:hover:not(:disabled) { border-color: var(--muted); }
button:disabled { opacity: 0.45; cursor: default; }
button.primary { background: var(--accent); color: #1a1400; border-color: transparent; font-weight: 600; }
button.primary.listening { background: var(--danger); color: #fff; }

main {
  display: grid;
  grid-template-columns: 320px 1fr;
  grid-template-areas:
    "live score"
    "settings score"
    "tips score";
  gap: 16px;
  padding: 16px 24px 40px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.live { grid-area: live; }
.settings { grid-area: settings; }
.score-panel { grid-area: score; min-height: 400px; }
.tips { grid-area: tips; color: var(--muted); font-size: 13px; }
.tips h3 { margin: 0 0 8px; color: var(--text); font-size: 14px; }
.tips ul { margin: 0; padding-left: 18px; }
.tips li { margin-bottom: 6px; }

.live-note { text-align: center; padding: 8px 0 12px; }
.note-name {
  font-size: 72px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  min-height: 72px;
}
.note-name sub { font-size: 28px; color: var(--muted); }
.note-freq { color: var(--muted); font-size: 13px; margin-top: 6px; }

.tuner { margin: 8px 0 4px; }
.tuner-scale { display: flex; justify-content: space-between; font-size: 11px; color: var(--muted); padding: 0 2px; }
.tuner-track {
  position: relative;
  height: 14px;
  border-radius: 7px;
  background: linear-gradient(90deg, #5a3a3a 0%, var(--panel-2) 35%, #2b4a44 50%, var(--panel-2) 65%, #5a3a3a 100%);
  border: 1px solid var(--border);
  margin-top: 4px;
}
.tuner-center { position: absolute; left: 50%; top: -3px; width: 2px; height: 20px; background: var(--muted); transform: translateX(-1px); }
.tuner-needle {
  position: absolute;
  top: -5px;
  left: 50%;
  width: 4px;
  height: 24px;
  border-radius: 2px;
  background: var(--accent-2);
  transform: translateX(-2px);
  transition: left 0.08s linear, opacity 0.2s;
  opacity: 0.3;
}
.tuner-needle.active { opacity: 1; }
.tuner-cents { text-align: center; font-size: 12px; color: var(--muted); margin-top: 6px; }

.meter { display: flex; align-items: center; gap: 10px; margin-top: 10px; }
.meter label { font-size: 12px; color: var(--muted); width: 40px; }
.meter-track { flex: 1; height: 8px; background: var(--panel-2); border-radius: 4px; overflow: hidden; border: 1px solid var(--border); }
.meter-bar { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent-2), var(--accent)); transition: width 0.05s linear; }

.status { margin-top: 14px; font-size: 13px; color: var(--muted); line-height: 1.4; }
.status.error { color: var(--danger); }

.settings { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field.checkbox { grid-column: 1 / -1; flex-direction: row; align-items: center; }
.field.checkbox label { display: flex; align-items: center; gap: 8px; color: var(--text); font-size: 13px; }
.field label { font-size: 12px; color: var(--muted); }
.field input[type="number"], .field select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 14px;
  width: 100%;
}
.field .inline { display: flex; align-items: center; gap: 6px; }
.field .unit { font-size: 12px; color: var(--muted); }
.field input[type="range"] { width: 100%; accent-color: var(--accent); }

.score-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 12px; }
.score-head h2 { margin: 0; font-size: 16px; font-weight: 600; }
.score-info { color: var(--muted); font-size: 13px; }

.score {
  background: var(--paper);
  border-radius: 8px;
  padding: 12px 8px;
  min-height: 320px;
  overflow-x: hidden;
}
.score svg { display: block; }

@media (max-width: 900px) {
  main {
    grid-template-columns: 1fr;
    grid-template-areas: "live" "settings" "score" "tips";
  }
}

@media print {
  @page { margin: 0.6in; }
  body { background: #fff; color: #000; }
  .topbar, main { display: none !important; }
}

/* ---- settings groups ---- */
.settings { display: flex; flex-direction: column; gap: 12px; }
.settings fieldset { border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px 12px; margin: 0; }
.settings legend { font-size: 12px; color: var(--accent); padding: 0 6px; letter-spacing: 0.3px; text-transform: uppercase; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 12px; }
.field.span2 { grid-column: 1 / -1; }
.field small { color: var(--muted); font-size: 11px; line-height: 1.3; }
.field .val { color: var(--text); font-variant-numeric: tabular-nums; margin-left: 4px; }

/* ---- level meter gate marker ---- */
.meter-track { position: relative; }
.meter-gate { position: absolute; top: -2px; width: 2px; height: 12px; background: var(--danger); left: 35%; }

/* ---- transport ---- */
.transport { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.transport button { padding: 6px 10px; font-size: 14px; min-width: 36px; }
.transport-bar { position: relative; flex: 1; height: 28px; display: flex; align-items: center; }
.transport-bar input[type="range"] {
  position: relative; z-index: 2; width: 100%; margin: 0; background: transparent; appearance: none; -webkit-appearance: none; cursor: pointer;
}
.transport-bar input[type="range"]:disabled { cursor: default; opacity: 0.5; }
.transport-bar input[type="range"]::-webkit-slider-runnable-track { height: 8px; border-radius: 4px; background: var(--panel-2); border: 1px solid var(--border); }
.transport-bar input[type="range"]::-moz-range-track { height: 8px; border-radius: 4px; background: var(--panel-2); border: 1px solid var(--border); }
.transport-bar input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 16px; height: 16px; margin-top: -5px; border-radius: 50%;
  background: var(--accent); border: 2px solid #1a1400; box-shadow: 0 0 0 2px rgba(245,185,66,0.25);
}
.transport-bar input[type="range"]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); border: 2px solid #1a1400; }
.transport-fill {
  position: absolute; left: 1px; top: 50%; height: 8px; transform: translateY(-50%); border-radius: 4px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent)); width: 0%; pointer-events: none; z-index: 1;
}
.transport-time { font-size: 12px; color: var(--muted); min-width: 110px; text-align: right; font-variant-numeric: tabular-nums; }

/* ---- playback highlight in the score ---- */
.score .vf-playing path, .score .vf-playing rect { fill: #d9822b !important; stroke: #d9822b !important; }
.score .vf-playing text { fill: #d9822b !important; }

/* ---- beat visualizer ---- */
.beats { margin-top: 14px; display: flex; align-items: center; gap: 12px; }
.beat-dots { display: flex; gap: 8px; flex-wrap: wrap; }
.beat-dot {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--panel-2); border: 1px solid var(--border);
  transition: transform 0.06s ease-out, background 0.06s, box-shadow 0.06s;
}
.beat-dot.downbeat { border-color: var(--accent); }
.beat-dot.active { background: var(--accent-2); transform: scale(1.35); box-shadow: 0 0 10px var(--accent-2); }
.beat-dot.downbeat.active { background: var(--accent); box-shadow: 0 0 12px var(--accent); }
.beat-label { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.beats.countin .beat-label { color: var(--accent); font-weight: 600; }

/* ---- source selector ---- */
main {
  grid-template-areas:
    "source score"
    "live score"
    "settings score"
    "tips score";
}
.source { grid-area: source; }
.source-tabs { display: flex; gap: 6px; margin-bottom: 12px; }
.source-tabs button { flex: 1; padding: 8px 4px; font-size: 12px; line-height: 1.2; white-space: normal; }
.source-tabs button.active { background: var(--accent); color: #1a1400; border-color: transparent; font-weight: 600; }
.source-body .hint { margin: 0 0 8px; font-size: 13px; color: var(--text); line-height: 1.4; }
.muted { color: var(--muted); font-size: 12px; }
.dropzone {
  position: relative; border: 1px dashed var(--muted); border-radius: 8px; padding: 18px 12px; text-align: center;
  font-size: 13px; margin-bottom: 12px; background: var(--panel-2); transition: border-color 0.15s, background 0.15s;
}
.dropzone.over { border-color: var(--accent); background: #26231a; }
.dropzone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; }
.progress { height: 6px; background: var(--panel-2); border-radius: 3px; overflow: hidden; margin: 10px 0 4px; border: 1px solid var(--border); }
.progress > div { height: 100%; width: 0%; background: var(--accent-2); transition: width 0.1s linear; }
.help { margin-top: 10px; font-size: 12px; color: var(--muted); }
.help summary { cursor: pointer; color: var(--text); }
.help ul { padding-left: 18px; margin: 8px 0 0; }
.help li { margin-bottom: 6px; line-height: 1.4; }

/* ---- rhythm extras ---- */
button.tap { width: 100%; padding: 6px 8px; }
button.tap.flash { background: var(--accent); color: #1a1400; }
.inline.nudge button { padding: 4px 10px; font-size: 14px; line-height: 1; }
.inline.nudge input { width: 70px; }

/* ---- transport extras ---- */
.transport select { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 5px 6px; font-size: 12px; }

/* ---- pitch trace ---- */
.trace-wrap { margin-bottom: 12px; }
.trace-head { display: flex; justify-content: space-between; font-size: 12px; color: var(--text); margin-bottom: 4px; }
.trace-canvas-wrap { position: relative; background: #0b0e12; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.trace-canvas-wrap canvas { display: block; width: 100%; height: 150px; cursor: crosshair; }
.trace-cursor { position: absolute; top: 0; bottom: 0; width: 2px; background: var(--accent); left: -10px; pointer-events: none; }

@media (max-width: 900px) {
  main { grid-template-areas: "source" "live" "settings" "score" "tips"; }
}
@media print {
  .source, .trace-wrap { display: none !important; }
}

/* keep number fields readable when they share a row with a unit label */
.field .inline input[type="number"] { flex: 1; min-width: 64px; }

/* file chooser */
.dropzone { padding: 16px 12px; }
.dropzone input[type="file"] { pointer-events: none; }   /* the button and drop handle it */
.dropzone .choose { background: var(--accent); color: #1a1400; border-color: transparent; font-weight: 600; margin-bottom: 8px; position: relative; z-index: 1; }
.dropzone > div { font-size: 12px; color: var(--muted); }
button.primary#btnOpenFile { font-weight: 600; }

/* ---- history ---- */
main {
  grid-template-areas:
    "source score"
    "history score"
    "live score"
    "settings score"
    "tips score";
}
.history { grid-area: history; }
.history-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.history-head h3 { margin: 0; font-size: 14px; }
button.small { padding: 4px 8px; font-size: 12px; }
.history .field { margin-bottom: 8px; }
.history .field input[type="text"], .history .field input[type="password"] {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 6px 8px; font-size: 13px; width: 100%;
}
.history-actions { display: flex; gap: 8px; margin-bottom: 6px; }
.history-actions button { flex: 1; }
.history .help { margin-top: 6px; }
.history .help .inline { display: flex; gap: 10px; margin: 6px 0; align-items: center; }
.history .help a { color: var(--accent-2); font-size: 12px; }
.history-list { list-style: none; margin: 10px 0 0; padding: 0; max-height: 260px; overflow-y: auto; border-top: 1px solid var(--border); }
.history-list li { padding: 8px 4px; border-bottom: 1px solid var(--border); cursor: pointer; font-size: 13px; }
.history-list li:hover { background: var(--panel-2); }
.history-list li.muted { cursor: default; }
.history-list .title { color: var(--text); font-weight: 600; }
.history-list .meta { color: var(--muted); font-size: 11px; margin-top: 2px; }
.history-list li.active { border-left: 3px solid var(--accent); padding-left: 6px; }
@media (max-width: 900px) {
  main { grid-template-areas: "source" "history" "live" "settings" "score" "tips"; }
}
@media print { .history { display: none !important; } }

/* ---- print menu ---- */
.menu-wrap { position: relative; display: inline-block; }
.menu { position: absolute; top: calc(100% + 6px); left: 0; z-index: 20; min-width: 260px; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 6px; box-shadow: 0 8px 24px rgba(0,0,0,0.4); display: flex; flex-direction: column; gap: 4px; }
.menu[hidden] { display: none; }
.menu button { text-align: left; width: 100%; }
.menu small { color: var(--muted); font-size: 11px; padding: 4px 6px 2px; line-height: 1.3; }

/* ---- print sheet: rendered off-screen so VexFlow can measure text, shown only when printing ---- */
.print-sheet { position: fixed; left: -20000px; top: 0; width: 760px; background: #fff; color: #000; }
.print-part { width: 760px; padding: 0; margin: 0 0 24px; page-break-after: always; break-after: page; }
.print-part:last-child { page-break-after: auto; break-after: auto; }
.print-part h1 { font-size: 22px; margin: 0 0 2px; color: #000; font-weight: 700; }
.print-part h2 { font-size: 15px; margin: 0 0 4px; color: #000; font-weight: 600; }
.print-part .print-meta { font-size: 12px; color: #333; margin: 0 0 10px; }
.print-part .print-score svg { display: block; }
body.print-preview .print-sheet { position: static; left: auto; width: auto; max-width: 760px; margin: 20px auto; padding: 20px; }
@media print {
  .print-sheet { position: static !important; left: auto !important; width: auto !important; }
  .history { display: none !important; }
}