:root {
  --cream: #F7EDCB;
  --cream-light: #FFFBEF;
  --green: #6EA763;
  --green-dark: #4F7E47;
  --green-deep: #355C2F;
  --tan-border: #E3D6A4;
  --text-main: #3A3424;
  --text-muted: #8A8266;
  /* Piano canvas colors — read by drawPiano() */
  --piano-white-lit: #6EA763;
  --piano-black-lit: #4F7E47;
  --piano-white-bg:  #FFFBEF;
  --piano-black-bg:  #3A3424;
  --piano-border:    #E3D6A4;
  --piano-label:     #B5AB86;
  --piano-label-c:   #6B6347;
  --piano-label-lit: #FFFBEF;
  --piano-middle-c:  #C0612B;
}

/* ── Boss theme ────────────────────────────────────────────────────────────── */
html.boss-theme {
  --cream:       #F0F4F8;
  --cream-light: #FFFFFF;
  --green:       #3B82F6;
  --green-dark:  #2563EB;
  --green-deep:  #1D4ED8;
  --tan-border:  #CBD5E1;
  --text-main:   #0F172A;
  --text-muted:  #64748B;
  --piano-white-lit: #3B82F6;
  --piano-black-lit: #1D4ED8;
  --piano-white-bg:  #F8FAFC;
  --piano-black-bg:  #1E293B;
  --piano-border:    #CBD5E1;
  --piano-label:     #94A3B8;
  --piano-label-c:   #334155;
  --piano-label-lit: #FFFFFF;
  --piano-middle-c:  #E11D48;
}
html.boss-theme body {
  font-family: "Jost", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
html.boss-theme button {
  font-family: "Jost", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
html.boss-theme select,
html.boss-theme input,
html.boss-theme label {
  font-family: "Jost", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--cream);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.app {
  width: 100%;
  max-width: 700px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

h1 {
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--green-deep);
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.controls {
  display: flex;
  gap: 1rem;
}

.mic-select-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.mic-select-row select {
  background: var(--cream-light);
  color: var(--text-main);
  border: 1px solid var(--tan-border);
  border-radius: 8px;
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
  font-family: inherit;
  max-width: 260px;
}

.shared-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.key-select-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.key-select-row select {
  background: var(--cream-light);
  color: var(--text-main);
  border: 1px solid var(--tan-border);
  border-radius: 8px;
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
  font-family: inherit;
}

.secondary-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
}

/* Slide switch: the checkbox is drawn as a pill with a sliding knob. */
.secondary-toggle input {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  width: 2.2rem;
  height: 1.25rem;
  margin: 0;
  border-radius: 999px;
  background: var(--tan-border);
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}

.secondary-toggle input::before {
  content: "";
  position: absolute;
  top: 0.15rem;
  left: 0.15rem;
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s;
}

.secondary-toggle input:checked {
  background: var(--green);
}

.secondary-toggle input:checked::before {
  transform: translateX(0.95rem);
}

.secondary-toggle input:focus-visible {
  outline: 2px solid var(--green-dark);
  outline-offset: 2px;
}

.roman-numeral {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  line-height: 1.4;
  min-height: 1.4em;
  text-align: center;
}

.roman-numeral .figures {
  display: inline-flex;
  flex-direction: column;
  vertical-align: middle;
  font-size: 0.7em;
  line-height: 1;
  margin: 0 0.08em;
}

.roman-numeral .figures.single {
  vertical-align: 0.45em;
}

button {
  font-family: inherit;
  padding: 0.7rem 1.8rem;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}

button:active { transform: scale(0.97); }
button:disabled { opacity: 0.4; cursor: default; }

.btn-primary {
  background: var(--green);
  color: var(--cream-light);
  border: 2px solid var(--green-deep);
}

.btn-secondary {
  background: var(--cream-light);
  color: var(--text-main);
  border: 1px solid var(--tan-border);
}

.accidental-toggle {
  display: flex;
  background: var(--cream-light);
  border: 1px solid var(--tan-border);
  border-radius: 8px;
  padding: 3px;
  gap: 3px;
}

.toggle-option {
  padding: 0.4rem 1rem;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.toggle-option.active {
  background: var(--green);
  color: var(--cream-light);
}

.status-bar {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  height: 1.2em;
}

.results {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  padding: 1.5rem;
  background: var(--cream-light);
  border-radius: 16px;
  border: 1px solid var(--tan-border);
}

.chord-name {
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--green-dark);
  line-height: 1.15;
  min-height: 1.15em;
  text-align: center;
}
/* Polychord: top chord over a bar over the bottom chord, sized so both lines fit in the usual space. */
.chord-name .poly {
  display: inline-flex;
  flex-direction: column;
  align-items: stretch;
  font-size: 0.55em;
  line-height: 1.05;
  vertical-align: middle;
}
.chord-name .poly span + span {
  border-top: 0.08em solid currentColor;
  padding-top: 0.06em;
}

.notes-detected {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.notes-detected span {
  color: var(--green-deep);
  font-weight: 800;
}

#notation, #midiNotation {
  width: 100%;
  display: flex;
  justify-content: center;
  margin-top: 0.5rem;
}
#notation     { min-height: 130px; }
#midiNotation { min-height: 340px; }

.piano-roll {
  width: 100%;
  height: 76px;
  border-radius: 6px;
  border: 1px solid var(--tan-border);
  display: block;
}

.tab-bar {
  display: flex;
  background: var(--cream-light);
  border: 1px solid var(--tan-border);
  border-radius: 12px;
  padding: 4px;
  gap: 4px;
  width: 100%;
  max-width: 360px;
}

.tab-btn {
  flex: 1;
  padding: 0.55rem 1rem;
  border-radius: 9px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.tab-btn.active {
  background: var(--green);
  color: var(--cream-light);
}

.tab-panel {
  display: none;
  width: 100%;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.tab-panel.active {
  display: flex;
}

/* ── Layout groups ── */
.sidebar-top,
.panel-controls {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

/* Wide screens: controls in a left sidebar, results beside them, no scrolling. */
@media (min-width: 960px) {
  .app {
    max-width: 1040px;
    padding: 1rem 2rem;
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr);
    grid-template-rows: auto 1fr;
    column-gap: 2rem;
    row-gap: 1.25rem;
    align-items: start;
  }
  .sidebar-top    { grid-column: 1; grid-row: 1; gap: 1.1rem; }
  .panel-controls { grid-column: 1; grid-row: 2; gap: 1.1rem; }
  .tab-panel.active { display: contents; }
  .results { grid-column: 2; grid-row: 1 / span 2; max-width: none; padding: 1rem 1.5rem; gap: 0.5rem; }
  h1 { font-size: 2rem; }
}

/* ── Pedal fade slider ── */
.fade-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}
.fade-row input[type="range"] {
  width: 160px;
  accent-color: var(--green-dark);
}
.fade-value {
  min-width: 3.2em;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
}

/* ── Theme toggle button ───────────────────────────────────────────────────── */
.theme-toggle {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: 20px;
  border: 1.5px solid var(--tan-border);
  background: var(--cream-light);
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 800;
  cursor: pointer;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: border-color 0.15s, color 0.15s, box-shadow 0.15s, background 0.15s;
  z-index: 100;
}
.theme-toggle:hover {
  border-color: var(--green-dark);
  color: var(--text-main);
  box-shadow: 0 3px 12px rgba(0,0,0,0.13);
}
.theme-toggle:active { transform: scale(0.97); }
.swap-arrow {
  font-size: 1rem;
  line-height: 1;
  display: inline-block;
}
.swap-arrow--blue  { color: #2563EB; }
.swap-arrow--green { color: #4F7E47; }