:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --line: #2a2f3a;
  --text: #e7e9ee;
  --muted: #8b93a3;
  --accent: #5ad1a6;
  --warn: #f2c14e;
  --bad: #ef5b5b;
  --blue: #6aa8ff;
  --wood: #2b2219;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); min-height: 100vh; }
button, select, input { font: inherit; color: inherit; }
button {
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 8px;
  padding: 7px 14px; cursor: pointer;
}
button:hover:not(:disabled) { border-color: #3d4452; background: #252a35; }
button:disabled { opacity: .4; cursor: default; }
button.primary { background: var(--accent); color: #062418; border-color: transparent; font-weight: 600; }
button.danger:hover:not(:disabled) { border-color: var(--bad); }
button.small { padding: 3px 10px; font-size: 13px; }
select, input[type=number] {
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 6px; padding: 5px 8px;
}
input[type=number] { width: 70px; }
input[type=range] { accent-color: var(--accent); vertical-align: middle; }
kbd {
  font-size: 10px; color: var(--muted); border: 1px solid var(--line); border-radius: 4px;
  padding: 0 4px; margin-left: 8px; font-family: inherit;
}
label { color: var(--muted); font-size: 13px; display: inline-flex; align-items: center; gap: 6px; }
label.check { cursor: pointer; }
output { font-variant-numeric: tabular-nums; min-width: 44px; display: inline-block; color: var(--text); }

.topbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 22px;
  padding: 10px 18px; background: var(--panel); border-bottom: 1px solid var(--line);
}
.brand { font-size: 20px; letter-spacing: .5px; margin-right: 6px; }
.brand b { color: var(--accent); }
.group { display: flex; align-items: center; gap: 10px; }
.meter { position: relative; width: 140px; height: 10px; background: #0b0d10; border-radius: 5px; overflow: hidden; border: 1px solid var(--line); }
#meterFill { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent) 70%, var(--warn) 88%, var(--bad)); background-size: 140px 100%; }
#meterPeak { position: absolute; top: 0; bottom: 0; width: 2px; background: #fff; left: 0; opacity: .8; }
.clip { font-size: 11px; font-weight: 700; color: #000; background: var(--bad); padding: 1px 5px; border-radius: 3px; visibility: hidden; }
.clip.on { visibility: visible; }

.tabs { display: flex; gap: 4px; padding: 10px 18px 0; border-bottom: 1px solid var(--line); }
.tabs button { border-radius: 8px 8px 0 0; border-bottom: none; background: transparent; color: var(--muted); padding: 9px 18px; }
.tabs button.active { background: var(--panel); color: var(--text); border-color: var(--line); }
.banner { margin: 14px 18px 0; padding: 10px 14px; border-radius: 8px; background: #1d2a25; border: 1px solid #2c4a3e; font-size: 14px; }
.banner.error { background: #2d1a1a; border-color: #5a2a2a; }
.banner.hidden { display: none; }
.banner code { background: #0b0d10; padding: 1px 5px; border-radius: 4px; font-size: 13px; }
main { padding: 18px; }
.tab { display: none; }
.tab.active { display: block; }
canvas { width: 100%; display: block; }

/* Tuner */
.tuner { max-width: 900px; margin: 0 auto; text-align: center; }
.tuner-note { height: 120px; line-height: 120px; }
.big-note { font-size: 110px; font-weight: 700; letter-spacing: -2px; transition: color .15s; }
.octave { font-size: 34px; color: var(--muted); vertical-align: super; margin-left: 4px; }
.big-note.in-tune { color: var(--accent); }
.big-note.close { color: var(--warn); }
.big-note.stale { color: #3a404d; }
#gauge { max-width: 760px; margin: 0 auto; }
.readouts { display: flex; justify-content: center; gap: 46px; margin-top: 4px; font-variant-numeric: tabular-nums; }
.readouts div { display: flex; flex-direction: column; font-size: 26px; min-width: 100px; }
.readouts small { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 1px; }
.hint { color: var(--muted); margin: 10px 0 14px; min-height: 22px; font-size: 18px; }
.hint.go { color: var(--accent); font-weight: 600; }
.strings { display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
#stringBtns { display: contents; }
.string { min-width: 58px; font-weight: 600; }
.string.active { background: var(--accent); color: #062418; border-color: transparent; }
.string.near { border-color: var(--accent); color: var(--accent); }
.string.tuned::after { content: ' ✓'; }
#history { background: var(--panel); border-radius: 10px; border: 1px solid var(--line); }

/* Analyzer */
.an-controls { display: flex; align-items: center; gap: 22px; margin-bottom: 14px; flex-wrap: wrap; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.seg button { border: none; border-radius: 0; background: var(--panel); }
.seg button.active { background: var(--accent); color: #062418; }
.an-main { display: grid; grid-template-columns: minmax(260px, 340px) 1fr; gap: 18px; }
@media (max-width: 900px) { .an-main { grid-template-columns: 1fr; } }
.an-result, .an-board { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.big-chord { font-size: 72px; font-weight: 700; line-height: 1.05; min-height: 76px; word-break: break-word; }
.big-chord.stale { color: #5a6170; }
.an-long { color: var(--muted); margin: 6px 0 14px; min-height: 20px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; min-height: 30px; }
.chip { background: var(--panel-2); border: 1px solid var(--line); border-radius: 14px; padding: 3px 10px; font-size: 14px; font-variant-numeric: tabular-nums; }
.chip.root { border-color: var(--accent); color: var(--accent); }
.chip small { color: var(--muted); margin-left: 4px; }
.alts { margin-top: 14px; color: var(--muted); font-size: 14px; }
.alts b { color: var(--text); font-weight: 500; margin-right: 8px; }
.board-head { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 14px; margin-bottom: 8px; }
.voicing button { padding: 1px 10px; }
.voicing span { margin: 0 8px; }
.fretboard { width: 100%; height: auto; display: block; }
.fb-wood { fill: var(--wood); }
.fb-inlay { fill: #5b4b3a; }
.fb-fret { stroke: #8d8f95; stroke-width: 2; }
.fb-nut { stroke: #e9e2d0; stroke-width: 6; }
.fb-string { stroke: #c9c4b8; }
.fb-fretnum, .fb-tuning { fill: var(--muted); font-size: 12px; text-anchor: middle; }
.fb-tuning { font-weight: 600; fill: var(--text); }
.fb-muted { fill: var(--bad); font-size: 20px; text-anchor: middle; font-weight: 700; }
.fb-marker circle { fill: var(--blue); stroke: #0f1115; stroke-width: 1.5; }
.fb-marker.root circle { fill: var(--accent); }
.fb-marker.alt circle { fill: #3b4253; }
.fb-marker.inferred circle { fill: #2c3d57; stroke: var(--blue); stroke-dasharray: 3 2; }
.fb-marker.inferred circle.open { fill: var(--bg); stroke-dasharray: 3 2; }
.fb-marker.inferred text { fill: var(--text); }
.fb-marker circle.open { fill: var(--bg); stroke: var(--blue); stroke-width: 3; }
.fb-marker.root circle.open { stroke: var(--accent); }
.fb-marker text { fill: #08110d; font-size: 11px; font-weight: 700; text-anchor: middle; }
.fb-marker.alt text { fill: var(--text); }
.fb-marker circle.open + text { fill: var(--text); }
.positions { margin-top: 10px; color: var(--muted); font-size: 14px; line-height: 1.6; }
.positions b { color: var(--text); font-weight: 600; }
.positions small { color: #6b7383; }
#spectrum { margin-top: 18px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; }
.history-strip { display: flex; align-items: center; gap: 12px; margin-top: 14px; color: var(--muted); font-size: 14px; }
#anHistory { display: flex; gap: 6px; flex: 1; overflow-x: auto; }
#anHistory span { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 3px 10px; color: var(--text); white-space: nowrap; }

/* Loop station */
.station { max-width: 1400px; margin: 0 auto; }
.transport { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 26px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; margin-bottom: 10px; }
.transport .tgroup { display: flex; align-items: center; gap: 8px; }
.transport kbd { margin-left: 6px; }
.transport .spacer { flex: 1; }
.playall { font-weight: 700; min-width: 150px; }
.beats { display: flex; gap: 6px; }
.beats span { width: 16px; height: 16px; border-radius: 50%; background: #262b36; border: 1px solid var(--line); transition: background .05s; }
.beats span.on { background: var(--accent); }
.beats span.on.accent { background: var(--warn); }
.barpos { font-variant-numeric: tabular-nums; min-width: 110px; color: var(--muted); }
.barpos.counting { color: var(--warn); font-weight: 700; }
.lockmsg { color: var(--muted); font-size: 12px; font-style: italic; }
.tracks { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 12px; }
@media (max-width: 1000px) { .tracks { grid-template-columns: 1fr; } }
.track { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px; display: flex; flex-direction: column; gap: 8px; border-top: 4px solid #3b4253; }
.track.selected { border-color: #46506a; box-shadow: 0 0 0 1px #46506a; }
.track[data-state=recording] { border-top-color: var(--bad); }
.track[data-state=dubbing] { border-top-color: #f2a14e; }
.track[data-state=playing] { border-top-color: var(--accent); }
.track-head { display: flex; justify-content: space-between; align-items: center; }
.tname { font-weight: 700; font-size: 17px; }
.tstate { font-size: 12px; font-weight: 700; letter-spacing: 1px; padding: 2px 8px; border-radius: 4px; background: #262b36; color: var(--muted); }
.tstate.recording { background: var(--bad); color: #1a0606; }
.tstate.dubbing { background: #f2a14e; color: #1f1204; }
.tstate.playing { background: var(--accent); color: #062418; }
.twave { height: 110px; background: #12151b; border-radius: 8px; border: 1px solid var(--line); }
.tinfo { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; min-height: 18px; }
.tpending { color: var(--warn); font-size: 13px; font-weight: 600; min-height: 18px; }
.tmain { padding: 16px; font-size: 18px; font-weight: 700; }
.tmain.rec { background: #4a1f22; border-color: #7b2f34; }
.tmain.dub { background: #4a3a1a; border-color: #7b6230; }
.tmain.play { background: #173d30; border-color: #2b6b54; }
.tmain.pending { animation: blink .5s steps(2, start) infinite; }
@keyframes blink { to { filter: brightness(1.6); } }
.trow { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 6px; }
.trow button { padding: 8px 6px; }
.tvol { justify-content: space-between; }
.tvol input { flex: 1; }
.help { color: var(--muted); font-size: 13px; margin-top: 16px; line-height: 1.6; }