:root {
  --bg: #15171c;
  --panel: #1e2128;
  --panel-edge: #2b2f38;
  --text: #e8e6e1;
  --muted: #9a9ca3;
  --accent: #e0a73a;
  --control: #2a2e37;
  --control-on: #3b4150;

  --board: #3a2618;
  --fret: #b9b3a6;
  --nut: #efe6d0;
  --string: #d9d2c2;
  --inlay: #d8cdb4;
  --root: #f2b84b;
  --root-text: #1f1604;
  --tone: #4f8fe6;
  --tone-text: #ffffff;
  --barre: #4f8fe6;
  --mute: #e0645a;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
}

header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 16px 24px 4px;
}
h1 { font-size: 20px; margin: 0; letter-spacing: 0.01em; }
h2 { font-size: 16px; margin: 0; }
#status { color: var(--mute); margin: 0; font-size: 13px; }

main {
  display: grid;
  gap: 16px;
  padding: 12px 24px 32px;
  max-width: 1320px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  padding: 14px 16px;
}
.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

label { color: var(--muted); font-size: 13px; display: inline-flex; align-items: center; gap: 6px; }

button, select, input {
  font: inherit;
  color: var(--text);
  background: var(--control);
  border: 1px solid var(--panel-edge);
  border-radius: 6px;
  padding: 5px 10px;
}
button { cursor: pointer; }
button:hover:not(:disabled) { background: var(--control-on); }
button:disabled { opacity: 0.4; cursor: default; }
button.on { background: var(--control-on); border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #1f1604; font-weight: 600; }
button.primary:hover:not(:disabled) { background: #f0bb55; }
input[type="number"] { width: 64px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Tuning */
.strings { display: flex; gap: 10px; flex-wrap: wrap; }
.string-ctl {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 44px;
}
.string-ctl span { font-weight: 600; font-size: 17px; }
.string-ctl button { padding: 0 10px; font-size: 11px; line-height: 20px; }

/* Explorer */
.controls, .pickers { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.segmented { display: inline-flex; }
.segmented button { border-radius: 0; }
.segmented button:first-child { border-radius: 6px 0 0 6px; }
.segmented button:last-child { border-radius: 0 6px 6px 0; border-left: none; }

.degrees { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.degrees button { min-width: 72px; }
.degrees .numeral { color: var(--accent); font-weight: 600; }

.chord-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin: 16px 0 8px;
}
#chord-name { font-size: 26px; min-width: 120px; }
.nav { display: inline-flex; align-items: center; gap: 8px; }
#counter { color: var(--muted); font-variant-numeric: tabular-nums; min-width: 64px; text-align: center; }

.board-scroll { overflow-x: auto; }
#fretboard { display: block; width: 100%; min-width: 960px; height: auto; }

#fretboard .board { fill: var(--board); }
#fretboard .fret { stroke: var(--fret); stroke-width: 2; }
#fretboard .nut { fill: var(--nut); }
#fretboard .string { stroke: var(--string); }
#fretboard .inlay { fill: var(--inlay); opacity: 0.55; }
#fretboard text { dominant-baseline: central; text-anchor: middle; }
#fretboard .fret-num { fill: var(--muted); font-size: 11px; }
#fretboard .string-name { fill: var(--text); font-size: 14px; font-weight: 600; }
#fretboard .empty { fill: var(--text); font-size: 16px; paint-order: stroke; stroke: var(--board); stroke-width: 6px; }
#fretboard .muted { fill: var(--mute); font-size: 20px; font-weight: 700; }
#fretboard .barre { fill: var(--barre); opacity: 0.55; }
#fretboard .dot circle { fill: var(--tone); stroke: rgba(0, 0, 0, 0.35); }
#fretboard .dot text { fill: var(--tone-text); font-size: 12px; font-weight: 600; }
#fretboard .dot.root circle { fill: var(--root); }
#fretboard .dot.root text { fill: var(--root-text); }
#fretboard .open circle { fill: none; stroke: var(--tone); stroke-width: 2.5; }
#fretboard .open text { fill: var(--text); font-size: 10px; font-weight: 600; }
#fretboard .open.root circle { stroke: var(--root); }
#fretboard .open.root text { fill: var(--root); }
#fretboard .all-tone circle { fill: var(--tone); opacity: 0.3; }
#fretboard .all-tone text { fill: var(--text); font-size: 11px; opacity: 0.85; }
#fretboard .all-tone.root circle { fill: var(--root); opacity: 0.5; }
#fretboard .all-tone.nut circle { fill: none; stroke: var(--tone); stroke-width: 2; opacity: 0.55; }
#fretboard .all-tone.nut.root circle { stroke: var(--root); }
#fretboard .hit { cursor: pointer; }
#fretboard .hit rect { fill: transparent; }
#fretboard .hit .ghost { fill: var(--control); stroke: var(--accent); stroke-width: 2; opacity: 0; pointer-events: none; }
#fretboard .hit:hover .ghost { opacity: 1; }
#fretboard .hit .hover-label { fill: var(--text); font-weight: 600; opacity: 0; pointer-events: none; }
#fretboard .hit:hover .hover-label { opacity: 1; }

/* Progression */
.playback { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.steps { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.step {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  background: var(--control);
  border: 1px solid var(--panel-edge);
  border-radius: 8px;
  padding: 3px;
}
.step.selected { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.step button { border: none; background: transparent; }
.step .step-name { font-weight: 600; padding: 4px 10px; }
.step .icon { padding: 2px 6px; color: var(--muted); font-size: 13px; }
.hint { color: var(--muted); margin: 0; font-size: 13px; }

@media (max-width: 640px) {
  header, main { padding-left: 16px; padding-right: 16px; }
}