:root {
  color-scheme: dark;
  font-family: "Inter Variable", Inter, system-ui, sans-serif;
  font-size: 13px;

  /* cool greys, against which the warm accents stand out; lines neutral */
  --bg: oklch(19.9% 0.014 285.1);
  --panel: oklch(23.1% 0.017 285);
  --panel-2: oklch(27% 0.022 284.8);
  --border: oklch(34.7% 0 0);
  /* for the few lines that divide more than the rest */
  --border-strong: oklch(46% 0 0);
  /* around the track being edited */
  --border-active: oklch(64% 0 0);
  --text: oklch(95.4% 0.008 332.1);
  --muted: oklch(63.9% 0.023 333.1);
  --accent: oklch(82.4% 0.159 330.6);
  --accent-mute: oklch(63.8% 0.13 331.4);
  /* the accent turned halfway round the hue wheel, for melodies */
  --accent-melody: oklch(82.4% 0.142 150.6);
  /* the accent turned towards purple, and a touch more vivid: chord notes outside the key */
  --accent-outside: oklch(82.4% 0.16 295.6);
  /* the other keys on the key's axis: a minor third up, down, and a tritone away */
  --accent-sharp: oklch(82.4% 0.127 40.6);
  --accent-flat: oklch(82.4% 0.127 210.6);
  --accent-inverse: oklch(82.4% 0.127 270.6);
  /* the parallel modes: quieter than the axis, and running from the brightest mode (light and
     warm) to the darkest (dim and cool), with the minor scales' variants off to the side in red */
  --mode-lydian: oklch(84% 0.075 95);
  --mode-ionian: oklch(80% 0.075 125);
  --mode-mixolydian: oklch(76% 0.075 155);
  --mode-dorian: oklch(72% 0.075 185);
  --mode-aeolian: oklch(68% 0.075 215);
  --mode-phrygian: oklch(64% 0.075 245);
  --mode-locrian: oklch(60% 0.075 275);
  --mode-harmonicMinor: oklch(70% 0.085 20);
  --mode-melodicMinor: oklch(75% 0.085 45);

  --row-off: oklch(20.8% 0.014 285.1);
  --row-scale: oklch(24.4% 0.019 284.9);
  --row-tonic: oklch(27.3% 0.036 301);
  --line-row: oklch(0% 0 0 / 0.165);
  --line-bar: oklch(100% 0 0 / 0.2);
  --line-beat: oklch(100% 0 0 / 0.09);

  --c: var(--muted);
}

/* in the key: nothing to point out */
.on-home {
  --c: var(--text);
}
/* from none of the key, its axis, or its parallel modes */
.chromatic {
  --c: var(--accent);
}
.on-sharp {
  --c: var(--accent-sharp);
}
.on-flat {
  --c: var(--accent-flat);
}
.on-inverse {
  --c: var(--accent-inverse);
}
.from-lydian {
  --c: var(--mode-lydian);
}
.from-ionian {
  --c: var(--mode-ionian);
}
.from-mixolydian {
  --c: var(--mode-mixolydian);
}
.from-dorian {
  --c: var(--mode-dorian);
}
.from-aeolian {
  --c: var(--mode-aeolian);
}
.from-phrygian {
  --c: var(--mode-phrygian);
}
.from-locrian {
  --c: var(--mode-locrian);
}
.from-harmonicMinor {
  --c: var(--mode-harmonicMinor);
}
.from-melodicMinor {
  --c: var(--mode-melodicMinor);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

button,
input,
select {
  font: inherit;
  color: inherit;
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 3px 8px;
}
button {
  cursor: pointer;
}
button:hover:not(:disabled) {
  border-color: var(--accent-mute);
}
button:disabled {
  opacity: 0.4;
  cursor: default;
}
input[type="checkbox"] {
  padding: 0;
  accent-color: var(--accent);
}

kbd,
code {
  font-family: inherit;
  font-size: 11px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 0 4px;
}

.app {
  display: grid;
  grid-template-rows: auto 1fr auto auto auto;
  height: 100vh;
}

/* the project on the left, the transport in the very middle, settings on the right */
.toolbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 8px 20px;
  align-items: center;
  padding: 8px 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);

  .tb-section {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    align-items: center;
  }
  .tb-right {
    justify-content: end;
  }

  .tb-group {
    display: flex;
    gap: 6px;
    align-items: center;
  }
  label {
    display: flex;
    gap: 6px;
    align-items: center;
    color: var(--muted);
  }
  .tb-projects {
    max-width: 160px;
  }
  .tb-bpm {
    width: 58px;
  }
  .tb-play {
    min-width: 70px;
    border-color: var(--accent);
  }
}

/* no room for three columns: let it wrap */
@media (max-width: 1080px) {
  .toolbar {
    display: flex;
    flex-wrap: wrap;
  }
}

.timeline {
  overflow: auto;
  user-select: none;
  -webkit-user-select: none;
  background: var(--bg);
}

.tl-content {
  position: relative;
  min-height: 100%;
}
.tl-rows {
  display: grid;
}

.tl-corner,
.ruler {
  position: sticky;
  top: 0;
  height: 22px;
  background-color: var(--panel);
  border-bottom: 1px solid var(--border);
  z-index: 3;
}
.tl-corner {
  left: 0;
  z-index: 4;
  border-right: 1px solid var(--border);
}
.ruler {
  cursor: text;

  .loop-region {
    position: absolute;
    top: 0;
    bottom: 0;
    background: color-mix(in oklab, var(--accent) 22%, transparent);
    border-inline: 2px solid var(--accent);
    cursor: default;
  }
  .loop-region.off {
    background: color-mix(in oklab, var(--muted) 12%, transparent);
    border-color: var(--muted);
  }
  /* straddling the region's edges, to grab them by */
  .loop-edge {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 9px;
    cursor: ew-resize;
  }
  .loop-edge.start {
    left: -6px;
  }
  .loop-edge.end {
    right: -6px;
  }
  span {
    position: absolute;
    top: 4px;
    font-size: 11px;
    color: var(--muted);
    pointer-events: none;
  }
}

.track-head {
  position: sticky;
  left: 0;
  scroll-margin-top: 22px;
  z-index: 2;
  background: var(--panel);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 6px 40px 6px 8px;
  /* dragged by, to move the track */
  cursor: grab;

  &.active {
    background: var(--panel-2);
  }
  &.active .th-name {
    font-weight: 650;
  }
  .th-top {
    display: flex;
    gap: 4px;
  }
  .th-name {
    flex: 1;
    min-width: 0;
    background: transparent;
    border-color: transparent;
    padding: 2px 4px;
  }
  .th-name:hover,
  .th-name:focus {
    border-color: var(--border);
  }
  .th-btn {
    padding: 0 6px;
    font-size: 11px;
  }
  .th-btn.on {
    background: var(--accent);
    color: var(--bg);
  }
  .th-bass {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 4px 0;
    color: var(--muted);
    font-size: 11px;
    input {
      margin: 0;
    }
  }
  .th-gain {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 4px 0;
    color: var(--muted);
    font-size: 11px;
    font-variant-numeric: tabular-nums;
    input {
      flex: 1;
      min-width: 0;
      margin: 0;
      accent-color: var(--muted);
    }
    span {
      width: 44px;
      text-align: right;
    }
  }
}

.keys {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 34px;
  overflow: hidden;
  cursor: ns-resize;

  .keys-inner {
    display: flex;
    flex-direction: column;
    will-change: translate;
  }

  .key {
    flex: 0 0 10px;
    background: oklch(88.5% 0.014 286.1);
    border-bottom: 1px solid oklch(0% 0 0 / 0.2);
    font-size: 8px;
    line-height: 9px;
    color: oklch(32.1% 0 0);
    text-align: right;
    padding-right: 2px;
  }
  .key.black {
    background: oklch(28.9% 0.018 285.2);
    margin-right: 12px;
  }
  .key.tonic {
    box-shadow: inset 3px 0 var(--accent);
  }
}

.lane {
  position: relative;
  border-bottom: 1px solid var(--border);
}

/* over the borders it shares with the tracks either side, rather than beside them */
:is(.track-head, .lane).active::after {
  content: "";
  position: absolute;
  inset: -1px 0;
  z-index: 1;
  border-block: 1px solid var(--border-active);
  pointer-events: none;
}

.track-resize {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  cursor: row-resize;

  &:hover {
    background: color-mix(in oklab, var(--accent) 50%, transparent);
  }
}
/* keep the resize cursor while dragging over other things */
body.resizing-track,
body.resizing-track * {
  cursor: row-resize !important;
}
body.resizing-loop,
body.resizing-loop * {
  cursor: ew-resize !important;
}
body.panning,
body.panning *,
body.reordering,
body.reordering * {
  cursor: grabbing !important;
}
.reorder-line {
  position: fixed;
  z-index: 10;
  height: 2px;
  background: var(--accent);
  pointer-events: none;
}

.roll {
  position: relative;
  overflow: hidden;
  cursor: crosshair;
}
.roll-inner {
  position: relative;
  /* moved through by transform, so its own layer: moving it then needn't paint it again */
  will-change: translate;
}

.lane.notes {
  --note: var(--accent-melody);
}

.note {
  position: absolute;
  overflow: hidden;
  padding-left: 2px;
  font-size: 9px;
  font-weight: 600;
  line-height: 9px;
  white-space: nowrap;
  color: oklch(0% 0 0 / 0.7);
  background: var(--note, var(--accent));
  box-shadow: inset 0 0 0 1px oklch(0% 0 0 / 0.267);

  &.selected {
    background: oklch(100% 0 0);
  }
  &.outside {
    --note: var(--accent-outside);
  }
  &.auto {
    background: color-mix(in oklab, var(--note, var(--accent)) 45%, var(--bg));
    color: oklch(100% 0 0 / 0.75);
  }
  /* written but not played: a bass left to another track */
  &.silent {
    background: none;
    box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--note, var(--accent)) 70%, transparent);
    color: var(--muted);
  }
  &.ghost {
    background: color-mix(in oklab, var(--accent-melody) 30%, transparent);
    box-shadow: none;
    pointer-events: none;
  }
}
.roll > .note:not(.auto) {
  cursor: grab;
}

.chord-col {
  position: absolute;
  top: 0;
  bottom: 0;

  /* chords take turns being shaded rather than getting lines: they always start on a grid line,
     and a line of their own would only brighten it */
  &.alt {
    background: oklch(100% 0 0 / 0.02);
  }
  &.current {
    background: oklch(100% 0 0 / 0.039);
  }
}

.strip {
  position: relative;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  cursor: text;
}

.chord {
  position: absolute;
  top: 4px;
  bottom: 4px;
  padding: 3px 6px;
  overflow: hidden;
  white-space: nowrap;
  cursor: grab;
  background: color-mix(in oklab, var(--c) 16%, var(--panel-2));
  border: 1px solid color-mix(in oklab, var(--c) 40%, transparent);
  border-left: 2px solid var(--c);

  &.current {
    outline: 2px solid var(--text);
    outline-offset: -1px;
  }
  &.selected {
    background: color-mix(in oklab, var(--c) 34%, var(--panel-2));
    border-color: var(--c);
  }
  &.unknown {
    --c: oklch(51% 0 0);
  }
  &.pinned::after {
    content: "";
    position: absolute;
    top: 4px;
    right: 8px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--text);
  }

  .chord-name {
    font-weight: 600;
    font-size: 14px;
  }
  .chord-roman {
    font-size: 11px;
    color: var(--muted);
  }
  .chord-tag {
    margin-left: 6px;
    color: var(--c);
  }
  .chord-handle {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 6px;
    cursor: ew-resize;
  }
}

.tl-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  margin-left: -1px;
  pointer-events: none;
  z-index: 1;
}
.tl-cursor {
  background: color-mix(in oklab, var(--accent) 60%, transparent);
}
.tl-playhead {
  background: var(--text);
}

.tl-add {
  position: sticky;
  left: 0;
  display: flex;
  gap: 6px;
  padding: 8px;
  z-index: 2;
}

.chord-editor {
  position: absolute;
  z-index: 5;
  display: flex;
  gap: 6px;
  align-items: center;
  padding: 6px 4px;
  pointer-events: none;

  input {
    pointer-events: auto;
    width: 110px;
    font-weight: 600;
    font-size: 14px;
    border-color: var(--accent);
    background: var(--bg);
  }
  input.invalid {
    border-color: oklch(68.8% 0.201 24.1);
    color: oklch(79% 0.121 20.1);
  }
  .chord-hint {
    color: var(--muted);
    background: var(--bg);
    padding: 2px 6px;
  }
  .chord-hint:empty {
    display: none;
  }
}

.palette {
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 6px 12px 8px;

  &[data-open="false"] {
    padding-bottom: 6px;
    header {
      margin-bottom: 0;
    }
    .palette-body,
    .help,
    label {
      display: none;
    }
  }
  max-height: 34vh;
  overflow: auto;

  header {
    display: flex;
    gap: 16px;
    align-items: center;
    color: var(--muted);
    margin-bottom: 6px;
    label {
      display: flex;
      gap: 4px;
      align-items: center;
    }
  }
}

.palette-body {
  display: flex;
  gap: 32px;
  align-items: start;
}

.circle {
  flex: none;
  width: 260px;
  height: 260px;

  .circle-chord {
    cursor: pointer;
    path {
      fill: transparent;
      stroke: color-mix(in oklab, var(--border) 70%, transparent);
    }
    &:hover path {
      fill: var(--panel-2);
    }
    &.here path {
      fill: color-mix(in oklab, var(--c) 18%, var(--panel));
      stroke: var(--c);
    }
    text {
      text-anchor: middle;
      pointer-events: none;
    }
    .name {
      fill: var(--c);
      font-size: 12px;
      font-weight: 600;
    }
    .roman {
      fill: var(--muted);
      font-size: 8.5px;
    }
    /* less room on the inner ring */
    &.minor .name {
      font-size: 10.5px;
    }
  }
}

.palette-row {
  display: grid;
  grid-template-columns: 110px repeat(7, 104px);
  border-top: 1px solid color-mix(in oklab, var(--border) 60%, transparent);

  /* the key and its axis, then the modes */
  &.on-inverse + .palette-row {
    border-top-color: var(--border-strong);
  }

  .palette-mode {
    display: grid;
    align-content: center;
    color: var(--c);
    small {
      color: var(--muted);
      font-size: 10px;
    }
  }
  &.on-home .palette-mode {
    font-weight: 650;
  }
}

.chip {
  display: flex;
  gap: 6px;
  align-items: baseline;
  padding: 4px 6px;
  background: none;
  border: none;

  b {
    color: var(--c);
    font-weight: 600;
  }
  span {
    color: var(--muted);
    font-size: 11px;
  }
  &:hover {
    background: var(--panel-2);
  }
  &.same {
    opacity: 0.35;
  }
}

.hints {
  display: flex;
  gap: 16px;
  padding: 6px 12px;
  color: var(--muted);
  font-size: 11px;
  border-top: 1px solid var(--border);
  background: var(--panel);

  .hint kbd + kbd {
    margin-left: 2px;
  }
}

.dialog {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 16px;
  width: min(560px, 90vw);

  &::backdrop {
    background: oklch(0% 0 0 / 0.5);
  }
  h2 {
    margin: 0 0 12px;
    font-size: 15px;
  }
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  margin-top: 12px;
}

.tt-dialog {
  .tt-options {
    display: grid;
    gap: 6px;
    max-height: 60vh;
    overflow: auto;
  }
  .tt-option {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2px 12px;
    text-align: left;
    padding: 8px 10px;
  }
  .tt-option:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: -2px;
  }
  .tt-detail {
    color: var(--muted);
  }
  .tt-preview {
    grid-column: 1 / -1;
    color: var(--muted);
    font-size: 11px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .tt-preview:empty {
    display: none;
  }
}

.midi-dialog {
  .midi-parts {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 6px 12px;
    align-items: baseline;
    max-height: 60vh;
    overflow: auto;
  }
  .midi-part {
    display: contents;
  }
  .midi-detail {
    color: var(--muted);
  }
}

.disclosure {
  background: none;
  border: none;
  padding: 0;
  font-size: 11px;
  white-space: nowrap;

  /* a chevron, as on git.t4t.associates */
  &::before {
    content: "";
    display: inline-block;
    position: relative;
    top: -0.17em;
    width: 0.4em;
    height: 0.4em;
    margin-right: 0.6em;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
  }
  &[aria-expanded="false"]::before {
    top: -0.05em;
    transform: rotate(-45deg);
  }
}

.help {
  display: inline-grid;
  place-items: center;
  width: 14px;
  height: 14px;
  border: 1px solid currentColor;
  border-radius: 50%;
  color: var(--muted);
  font-size: 9px;
  font-weight: 650;
  cursor: help;

  &:hover {
    color: var(--accent);
  }
}
.disclosure:hover:not(:disabled) {
  color: var(--accent);
}

.chord-panel {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 6px 12px;
  background: var(--panel);
  border-top: 1px solid var(--border);

  &[data-open="true"] .chord-panel-body {
    min-height: 42px;
  }
  .chord-panel-body {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    /* the buttons in a line, under their labels */
    align-items: end;
  }

  .chord-panel-empty {
    align-self: center;
    color: var(--muted);
  }
  .chord-panel-name {
    display: grid;
    min-width: 72px;
    &:empty {
      display: none;
    }
    b {
      font-size: 16px;
    }
    span {
      color: var(--muted);
      font-size: 11px;
    }
  }
  .chord-panel-group {
    display: grid;
    gap: 3px;
  }
  .chord-panel-label {
    color: var(--muted);
    font-size: 11px;
  }
  .chord-panel-buttons {
    display: flex;
    gap: 4px;
  }
  .chord-panel-action {
    display: flex;
    gap: 6px;
    align-items: baseline;
    padding: 3px 8px;
    b {
      font-weight: 650;
    }
  }
}

.select-box {
  position: fixed;
  z-index: 10;
  pointer-events: none;
  border: 1px solid var(--accent-melody);
  background: color-mix(in oklab, var(--accent-melody) 15%, transparent);
}

.menu {
  /* undo the centring popovers get by default, so it can sit under its button */
  inset: auto;
  margin: 0;
  padding: 4px;
  min-width: 170px;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--border);
  box-shadow: 0 8px 24px oklch(0% 0 0 / 0.4);

  button {
    display: block;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: 5px 10px;
  }
  button:hover {
    background: color-mix(in oklab, var(--accent) 18%, transparent);
  }
  hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 4px 2px;
  }
}