:root {
  /* base tokens */
  --font-family: Arial, sans-serif;
  --page-padding: 20px;
  --radius: 10px;
  --gap: 12px;
  --control-padding: 16px;
  --control-input-padding: 8px;
  --control-font-size: 14px;
  --transition-fast: 0.15s ease;
  --transition-medium: 0.2s ease;

  /* light theme colors */
  --bg: #f5f5f5;
  --text: #111;
  --surface: #fff;
  --muted-border: #ddd;
  --control-border: #ccc;
  --thead-bg: #eee;
  --cell-border: #999;
  --hover-bg: #f0f0f0;

  /* legend/badge defaults (used as fallbacks) */
  --badge-root: gold;
  --badge-scale: #7ec8ff;
  --badge-triad: #9eff9e;
  --badge-seventh: #ffb6c1;
  --badge-interval: #ffde91;
  --badge-previous: #ffb0b0;
  --badge-next: #a8ffb0;

  /* colors used in dark mode for text on badges */
  --badge-dark-text: #333;
  --badge-dark-hover-text: #ccc;
}

/* dark theme overrides */
body.dark {
  --bg: #000;
  --text: #f3f4f6;
  --surface: #333;
  --muted-border: #374151;
  --control-border: #4b5563;
  --thead-bg: #555;
  --cell-border: #4b5563;
  --hover-bg: #555;

  /* badges keep same background, but text on them should be darker for contrast */
  --badge-dark-text: #333;
  --badge-dark-hover-text: #ccc;
}

* {
  box-sizing: border-box;
}
body {
  font-family: var(--font-family);
  margin: 0;
  padding: var(--page-padding);
  background: var(--bg);
  color: var(--text);
  transition: background var(--transition-medium),
    color var(--transition-medium);
}

h1 {
  margin-top: 0;
}

.controls-shell {
  margin-bottom: 20px;
}

.controls-drawer-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.controls-drawer-input:focus-visible + .controls-compact-bar {
  outline: 2px solid var(--control-border);
  outline-offset: 2px;
}

.controls-compact-bar {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: 12px var(--control-padding);
}

.controls-summary-line {
  margin: 0;
  font-size: 13px;
  line-height: 1.35;
  color: var(--text);
  opacity: 0.92;
  flex: 1;
  min-width: 0;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  line-clamp: 2;
  -webkit-line-clamp: 2;
  overflow: hidden;
}

.controls-drawer-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  padding: var(--control-input-padding) 12px;
  font-size: var(--control-font-size);
  font-weight: bold;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--control-border);
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.controls-drawer-label:hover {
  background: var(--hover-bg);
}

.controls-drawer-chevron {
  display: inline-block;
  transition: transform var(--transition-fast);
}

.controls-drawer-chevron::before {
  content: "";
  display: block;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--text);
}

.controls-drawer-input:checked
  ~ .controls-compact-bar
  .controls-drawer-chevron {
  transform: rotate(180deg);
}

/* Control grid: even rows — 1 col → 2 → 3 → 6 as width allows */
.controls {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  margin-bottom: 0;
  background: var(--surface);
  padding: var(--control-padding);
  border-radius: var(--radius);
  border: 1px solid var(--muted-border);
  transition: background var(--transition-medium),
    border-color var(--transition-medium);
}

@media (min-width: 440px) {
  .controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .controls {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .controls {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

label {
  font-size: var(--control-font-size);
  font-weight: bold;
}

select,
button {
  padding: var(--control-input-padding);
  font-size: var(--control-font-size);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--control-border);
  border-radius: 6px;
}

.table-wrapper {
  overflow-x: auto;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--muted-border);
  padding: 12px;
  transition: background var(--transition-medium),
    border-color var(--transition-medium);
}

table {
  border-collapse: collapse;
  width: max-content;
  min-width: 100%;
}

th,
td {
  border: 1px solid var(--cell-border);
  width: 48px;
  height: 48px;
  text-align: center;
  vertical-align: middle;
  user-select: none;
  position: relative;
}

td {
  cursor: pointer;
  transition: background var(--transition-fast);
}

thead th {
  background: var(--thead-bg);
  position: sticky;
  top: 0;
  z-index: 2;
}

/* freeze top-left (fret 0) so it stays with the sticky string column on horizontal scroll */
thead th:first-child {
  left: 0;
  z-index: 3;
}

tbody th {
  background: var(--thead-bg);
  position: sticky;
  left: 0;
  z-index: 1;
}

tbody th[data-note] {
  cursor: pointer;
  transition: background var(--transition-fast);
}

tbody th[data-note]:hover {
  background: var(--hover-bg);
}

td:hover {
  background: var(--hover-bg);
}

/* badge / cell color utilities */
.root {
  background: var(--badge-root);
  font-weight: bold;
}
.scale {
  background: var(--badge-scale);
}
.triad {
  background: var(--badge-triad);
}
.seventh {
  background: var(--badge-seventh);
}
.interval {
  background: var(--badge-interval);
}
.previous {
  background: var(--badge-previous);
}
.next {
  background: var(--badge-next);
}

/* dark-mode badge text color + hover */
body.dark tbody :is(td, th).root,
body.dark tbody :is(td, th).scale,
body.dark tbody :is(td, th).triad,
body.dark tbody :is(td, th).seventh,
body.dark tbody :is(td, th).interval,
body.dark tbody :is(td, th).previous,
body.dark tbody :is(td, th).next {
  color: var(--badge-dark-text);
}

body.dark tbody :is(td, th).root:hover,
body.dark tbody :is(td, th).scale:hover,
body.dark tbody :is(td, th).triad:hover,
body.dark tbody :is(td, th).seventh:hover,
body.dark tbody :is(td, th).interval:hover,
body.dark tbody :is(td, th).previous:hover,
body.dark tbody :is(td, th).next:hover {
  color: var(--badge-dark-hover-text);
}

/* header/footer color adjustments in dark mode (driven by variables) */
body.dark thead th,
body.dark tbody th {
  background: var(--thead-bg);
  color: var(--text);
}

body.dark td {
  color: var(--text);
  border-color: var(--cell-border);
}

body.dark th {
  border-color: var(--cell-border);
}

.marker::after {
  content: "•";
  position: absolute;
  bottom: 2px;
  right: 4px;
  font-size: 12px;
  opacity: 0.5;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap);
  margin-top: 16px;
  font-size: 14px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-color {
  width: 18px;
  height: 18px;
  border: 1px solid var(--cell-border);
}

/* responsive tweak */
@media (max-width: 700px) {
  th,
  td {
    width: 42px;
    height: 42px;
    font-size: 12px;
  }

  .controls-shell {
    background: var(--surface);
    border: 1px solid var(--muted-border);
    border-radius: var(--radius);
    transition: background var(--transition-medium),
      border-color var(--transition-medium);
  }

  .controls-compact-bar {
    display: flex;
  }

  .controls {
    display: none;
    border: none;
    border-radius: 0;
    border-top: 1px solid var(--muted-border);
    padding-top: 12px;
  }

  .controls-drawer-input:checked ~ .controls {
    display: grid;
  }
}

@media (min-width: 701px) {
  .controls-drawer-input,
  .controls-compact-bar {
    display: none;
  }

  .controls {
    display: grid;
  }
}