/* ═══════════════════════════════════════════════════════════════════
   cof-applications.css — Additional Circle-of-Fifths visualisations
   Three independent collapsible sections, each with one wheel.
   ═══════════════════════════════════════════════════════════════════ */

.cofa-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg, 14px);
  box-shadow: var(--shadow);
  margin-top: var(--panel-gap, 20px);
  overflow: hidden;
  position: relative;        /* anchor for the .section-top-btn */
}

.cofa-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--sp-3, 12px) var(--sp-4, 16px);
  cursor: pointer;
  user-select: none;
  background: transparent;
  border: none;
  font: inherit;
  color: inherit;
  text-align: left;
}
.cofa-toggle h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0;
}
.cofa-toggle .cofa-sub {
  color: var(--text-muted, #888);
  font-weight: 400;
  font-size: 0.85em;
  margin-left: 4px;
}
.cofa-caret {
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1;
  padding: 0 8px;
  border-radius: var(--r-sm, 6px);
  background: var(--surface-2, #f5f4f0);
  border: 1px solid var(--border);
  color: var(--text-muted, #888);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.cofa-toggle:hover .cofa-caret {
  background: var(--surface, #fff);
  border-color: var(--accent, #e8874a);
  color: var(--accent, #e8874a);
}
.cofa-toggle.open .cofa-caret {
  background: rgba(232, 135, 74, 0.10);
  border-color: var(--accent, #e8874a);
  color: var(--accent, #e8874a);
}

.cofa-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.cofa-body.open {
  max-height: 1200px;
}

.cofa-content {
  display: flex;
  gap: var(--sp-4, 16px);
  padding: 0 var(--sp-4, 16px) var(--sp-4, 16px);
  align-items: flex-start;
  flex-wrap: wrap;
}

.cofa-svg-wrap {
  flex: 0 0 auto;
}
.cofa-info-col {
  flex: 1 1 240px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3, 12px);
}

/* ── Controls (overlay buttons for the symmetric-scales wheel) ──── */
.cofa-controls {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.cofa-controls button {
  font: inherit;
  font-size: 0.85rem;
  padding: 5px 12px;
  background: var(--surface-2, #f5f4f0);
  border: 1px solid var(--border);
  color: var(--text-muted, #888);
  border-radius: var(--r-sm, 6px);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
}
.cofa-controls button:hover {
  border-color: var(--accent, #e8874a);
  color: var(--text);
}
.cofa-controls button.active {
  background: rgba(232, 135, 74, 0.15);
  border-color: var(--accent, #e8874a);
  color: var(--accent, #e8874a);
  font-weight: 600;
}

/* ── Wedges (shared) ───────────────────────────────────────────── */
.cofa-svg { display: block; }
.cofa-wedge {
  fill: transparent;
  stroke: transparent;
  cursor: pointer;
  transition: fill 0.12s, stroke 0.12s;
}
.cofa-wedge:hover { stroke: var(--accent, #e8874a); stroke-width: 1.5; }
.cofa-wedge-line { stroke: var(--border); stroke-width: 0.8; }
.cofa-wedge-label {
  font-family: var(--font-mono, 'DM Mono', monospace);
  font-size: 14px;
  font-weight: 700;
  fill: var(--text);
  pointer-events: none;
}
.cofa-label-selected {
  fill: var(--accent, #e8874a);
  font-weight: 800;
}
.cofa-wedge.cofa-selected {
  stroke: var(--accent, #e8874a);
  stroke-width: 2.5;
}

/* ── Group colour palettes ─────────────────────────────────────── */
/* Symmetric scales — 4 group palettes (use up to N of them) */
.cofa-grp-0 { fill: rgba(91, 143, 217, 0.20); }   /* blue */
.cofa-grp-1 { fill: rgba(232, 135, 74, 0.18); }   /* orange */
.cofa-grp-2 { fill: rgba(74, 190, 130, 0.20); }   /* green */
.cofa-grp-3 { fill: rgba(170, 110, 200, 0.20); }  /* purple */
[data-theme="dark"] .cofa-grp-0 { fill: rgba(91, 143, 217, 0.30); }
[data-theme="dark"] .cofa-grp-1 { fill: rgba(232, 135, 74, 0.28); }
[data-theme="dark"] .cofa-grp-2 { fill: rgba(74, 190, 130, 0.30); }
[data-theme="dark"] .cofa-grp-3 { fill: rgba(170, 110, 200, 0.30); }

/* Bartók axes */
.cofa-axis-T { fill: rgba(232, 135, 74, 0.20); }   /* Tonic — orange */
.cofa-axis-S { fill: rgba(74, 190, 130, 0.20); }   /* Subdominant — green */
.cofa-axis-D { fill: rgba(91, 143, 217, 0.20); }   /* Dominant — blue */
[data-theme="dark"] .cofa-axis-T { fill: rgba(232, 135, 74, 0.30); }
[data-theme="dark"] .cofa-axis-S { fill: rgba(74, 190, 130, 0.30); }
[data-theme="dark"] .cofa-axis-D { fill: rgba(91, 143, 217, 0.30); }

/* Coltrane cycles — 4 colours, faint */
.cofa-cyc-0 { fill: rgba(232, 135, 74, 0.10); }
.cofa-cyc-1 { fill: rgba(91, 143, 217, 0.10); }
.cofa-cyc-2 { fill: rgba(74, 190, 130, 0.10); }
.cofa-cyc-3 { fill: rgba(170, 110, 200, 0.10); }
/* The cycle the selected pc lives in gets bumped */
.cofa-cyc-0.cofa-active-cycle { fill: rgba(232, 135, 74, 0.28); }
.cofa-cyc-1.cofa-active-cycle { fill: rgba(91, 143, 217, 0.28); }
.cofa-cyc-2.cofa-active-cycle { fill: rgba(74, 190, 130, 0.28); }
.cofa-cyc-3.cofa-active-cycle { fill: rgba(170, 110, 200, 0.28); }

.cofa-triangle {
  fill: none;
  stroke: var(--accent, #e8874a);
  stroke-width: 2;
  stroke-linejoin: round;
  opacity: 0.75;
}
/* Bartók T-axis square — same visual treatment as the Coltrane triangle */
.cofa-bartok-square {
  fill: none;
  stroke: var(--accent, #e8874a);
  stroke-width: 2;
  stroke-linejoin: round;
  opacity: 0.75;
}

/* ── Legend ────────────────────────────────────────────────────── */
.cofa-legend {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cofa-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-2, var(--text));
  padding: 3px 8px;
  border-radius: var(--r-sm, 6px);
}
.cofa-legend-item.cofa-legend-active {
  background: rgba(232, 135, 74, 0.10);
  font-weight: 600;
}
.cofa-legend-swatch {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
/* Apply group/axis colours TO the swatch via the parent's class */
.cofa-legend-item.cofa-grp-0 .cofa-legend-swatch { background: rgba(91, 143, 217, 0.50); }
.cofa-legend-item.cofa-grp-1 .cofa-legend-swatch { background: rgba(232, 135, 74, 0.50); }
.cofa-legend-item.cofa-grp-2 .cofa-legend-swatch { background: rgba(74, 190, 130, 0.50); }
.cofa-legend-item.cofa-grp-3 .cofa-legend-swatch { background: rgba(170, 110, 200, 0.50); }
.cofa-legend-item.cofa-axis-T .cofa-legend-swatch { background: rgba(232, 135, 74, 0.50); }
.cofa-legend-item.cofa-axis-S .cofa-legend-swatch { background: rgba(74, 190, 130, 0.50); }
.cofa-legend-item.cofa-axis-D .cofa-legend-swatch { background: rgba(91, 143, 217, 0.50); }
.cofa-legend-item.cofa-cyc-0 .cofa-legend-swatch { background: rgba(232, 135, 74, 0.50); }
.cofa-legend-item.cofa-cyc-1 .cofa-legend-swatch { background: rgba(91, 143, 217, 0.50); }
.cofa-legend-item.cofa-cyc-2 .cofa-legend-swatch { background: rgba(74, 190, 130, 0.50); }
.cofa-legend-item.cofa-cyc-3 .cofa-legend-swatch { background: rgba(170, 110, 200, 0.50); }

.cofa-info {
  font-size: 0.92rem;
  color: var(--text-2, var(--text));
  line-height: 1.5;
}
.cofa-info strong { color: var(--text); }
.cofa-info em { color: var(--accent, #e8874a); font-style: normal; font-weight: 600; }
.cofa-info p { margin: 0 0 var(--sp-3, 12px) 0; }

/* ── Coltrane substitution block ──────────────────────────────── */
.cofa-sub-block {
  margin-top: var(--sp-3, 12px);
  padding: 10px 12px;
  background: var(--surface-2, #f5f4f0);
  border: 1px solid var(--border);
  border-radius: var(--r-sm, 6px);
}
[data-theme="dark"] .cofa-sub-block {
  background: var(--surface-2, #2a2a2a);
}
.cofa-sub-block h5 {
  margin: 0 0 6px 0;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted, #888);
}
.cofa-sub-line {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono, 'DM Mono', monospace);
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text);
  margin: 2px 0;
  word-spacing: 0.04em;
  flex-wrap: wrap;
}
.cofa-sub-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;          /* uniform width — Org and Sub line up */
  box-sizing: border-box;
  font-family: var(--font-sans, 'DM Sans', sans-serif);
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-3, #aaa);
  flex-shrink: 0;
  text-align: center;
}
.cofa-sub-orig .cofa-sub-tag {
  color: var(--text-muted, #888);
}
.cofa-sub-new .cofa-sub-tag {
  background: rgba(232, 135, 74, 0.15);
  border-color: var(--accent, #e8874a);
  color: var(--accent, #e8874a);
}
.cofa-sub-orig {
  color: var(--text-muted, #888);
}
.cofa-sub-new {
  color: var(--text);
}
.cofa-sub-note {
  margin: 6px 0 0 0;
  font-size: 0.82rem;
  font-style: italic;
  color: var(--text-muted, #888);
  line-height: 1.45;
}
.cofa-sub-note em { font-style: italic; }

/* ── V7 → I arrows on the Coltrane wheel ──────────────────────── */
.cofa-v7-arrow {
  fill: none;
  stroke: var(--dom, #aa6ec8);
  stroke-width: 1.6;
  stroke-linecap: round;
  opacity: 0.85;
}
.cofa-v7-arrowhead {
  fill: var(--dom, #aa6ec8);
  stroke: none;
}
.cofa-legend-swatch-arrow {
  background: transparent;
  border: none;
  position: relative;
}
.cofa-legend-swatch-arrow::after {
  content: '→';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dom, #aa6ec8);
  font-weight: 800;
  font-size: 1rem;
}

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 700px) {
  .cofa-content { gap: var(--sp-3, 12px); }
  .cofa-svg { width: 240px; height: 240px; }
}