/* ============================================================
   v6 Chord progression strip + picker popover + in-chord cell tint
   ============================================================
   Mounts above .tracks-container. Driven by src/ui/ChordStrip.js.
*/

@layer v6-components {

  .v6-chord-strip {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    margin: 0 0 8px 0;

    background: linear-gradient(180deg,
      var(--surface-300, #18181b) 0%,
      var(--surface-200, #111113) 100%);
    border-top: 1px solid var(--v6-border, rgba(255,255,255,0.08));
    border-bottom: 1px solid var(--v6-border, rgba(255,255,255,0.08));

    color: var(--text-secondary, #a1a1aa);
    font-family: var(--font-sans, system-ui);
    font-size: var(--text-xs, 12px);
    user-select: none;
  }

  .v6-chord-strip__label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted, #71717a);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 10px;
    font-weight: 600;
    flex-shrink: 0;
  }
  .v6-chord-strip__label .v6-icon { color: var(--accent-primary, #8b5cf6); }

  .v6-chord-strip__slots {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    flex: 1;
  }

  .v6-chord-strip__actions {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
  }

  .v6-chord-strip__key {
    display: inline-block;
    padding: 3px 8px;
    background: var(--surface-400, #1f1f23);
    border: 1px solid var(--v6-border, rgba(255,255,255,0.08));
    border-radius: var(--radius-sm, 4px);
    font-family: var(--font-mono, monospace);
    font-size: 11px;
    color: var(--text-primary, #fafafa);
    letter-spacing: 0.02em;
  }

  /* ============================================================
     Slot button
     ============================================================ */
  .v6-chord-slot {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 6px 10px;
    min-height: 48px;

    background: var(--surface-400, #1f1f23);
    border: 1px solid var(--v6-border, rgba(255,255,255,0.08));
    border-radius: var(--radius-md, 6px);
    color: var(--text-secondary, #a1a1aa);
    cursor: pointer;

    transition: background-color var(--duration-fast, 120ms),
                border-color var(--duration-fast, 120ms),
                color var(--duration-fast, 120ms),
                box-shadow var(--duration-fast, 120ms),
                transform var(--duration-instant, 50ms);
  }
  .v6-chord-slot:hover {
    background: var(--surface-500, #27272b);
    border-color: var(--accent-primary, #8b5cf6);
    color: var(--text-primary, #fafafa);
    /* v9.3 — clear click-to-edit affordance */
    box-shadow:
      0 0 0 1px rgba(139, 92, 246, 0.30),
      0 4px 12px -2px rgba(139, 92, 246, 0.35);
    transform: translateY(-1px);
  }
  /* v9.3 — pencil icon revealed on hover */
  .v6-chord-slot__edit-icon {
    position: absolute;
    top: 3px;
    right: 5px;
    font-size: 10px;
    color: var(--accent-primary, #c4b5fd);
    opacity: 0;
    transition: opacity var(--duration-fast, 120ms);
    pointer-events: none;
  }
  .v6-chord-slot:hover .v6-chord-slot__edit-icon {
    opacity: 0.85;
  }
  .v6-chord-slot:active {
    transform: translateY(1px);
  }
  .v6-chord-slot:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--surface-200, #111113), 0 0 0 4px var(--accent-primary, #8b5cf6);
  }
  .v6-chord-slot--locked {
    border-color: var(--accent-primary, #8b5cf6);
    box-shadow: inset 0 0 0 1px rgba(139, 92, 246, 0.3);
  }
  .v6-chord-slot--low-confidence {
    opacity: 0.6;
  }

  .v6-chord-slot__bar {
    position: absolute;
    top: 4px;
    left: 6px;
    font-size: 9px;
    color: var(--text-muted, #71717a);
    font-family: var(--font-mono, monospace);
    line-height: 1;
  }
  .v6-chord-slot__degree {
    font-family: var(--font-mono, monospace);
    font-size: 13px;
    font-weight: 700;
    color: var(--accent-primary, #8b5cf6);
    letter-spacing: 0.02em;
    line-height: 1;
  }
  .v6-chord-slot__name {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-primary, #fafafa);
    line-height: 1;
  }

  /* ============================================================
     Chord picker popover (floating)
     ============================================================ */
  .v6-chord-picker {
    position: fixed;
    z-index: var(--z-popover, 1000);
    min-width: 240px;
    padding: 8px;
    background: var(--v6-panel, var(--surface-300, #18181b));
    border: 1px solid var(--v6-border-strong, rgba(255,255,255,0.14));
    border-radius: var(--radius-lg, 8px);
    box-shadow: var(--shadow-4, 0 24px 64px rgba(0,0,0,0.7));

    opacity: 0;
    transform: scale(0.96) translateY(-2px);
    transform-origin: top center;
    transition: opacity var(--duration-fast, 120ms) var(--ease-out-quart),
                transform var(--duration-fast, 120ms) var(--ease-out-quart);
  }
  .v6-chord-picker--visible {
    opacity: 1;
    transform: scale(1) translateY(0);
  }

  .v6-chord-picker__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 8px 8px;
    border-bottom: 1px solid var(--v6-border-faint, rgba(255,255,255,0.04));
    margin-bottom: 8px;
    color: var(--text-secondary, #a1a1aa);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
  }
  .v6-chord-picker__key {
    color: var(--text-muted, #71717a);
    font-family: var(--font-mono, monospace);
    text-transform: none;
    letter-spacing: 0;
  }

  .v6-chord-picker__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
  }
  .v6-chord-pick {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 6px 4px;
    background: var(--surface-400, #1f1f23);
    border: 1px solid transparent;
    border-radius: var(--radius-sm, 4px);
    color: var(--text-primary, #fafafa);
    cursor: pointer;
    transition: background var(--duration-fast, 120ms),
                border-color var(--duration-fast, 120ms);
  }
  .v6-chord-pick:hover {
    background: var(--surface-500, #27272b);
    border-color: var(--accent-primary, #8b5cf6);
  }
  .v6-chord-pick__degree {
    font-family: var(--font-mono, monospace);
    font-size: 12px;
    font-weight: 700;
    color: var(--accent-primary, #8b5cf6);
  }
  .v6-chord-pick__name {
    font-size: 10px;
    color: var(--text-secondary, #a1a1aa);
  }

  .v6-chord-picker__footer {
    display: flex;
    justify-content: flex-end;
    padding-top: 8px;
    margin-top: 8px;
    border-top: 1px solid var(--v6-border-faint, rgba(255,255,255,0.04));
  }
}

/* ============================================================
   In-chord cell highlighting
   ============================================================
   Driven by ChordStrip's `.in-chord` class on melodic .cell elements.
   Layered on top of editor.css so the highlight composes with
   .active, .playing, .in-scale, etc.
*/
@layer v6-editor {
  .sequencer-grid .cell.in-chord:not(.active) {
    /* Subtle inner tint to indicate "this cell is in the chord for its beat" */
    background: rgba(139, 92, 246, 0.07);
    box-shadow: inset 0 0 0 1px rgba(139, 92, 246, 0.10);
  }
  /* Stronger emphasis when also in scale */
  .sequencer-grid .cell.in-chord.in-scale:not(.active) {
    background: rgba(139, 92, 246, 0.12);
    box-shadow: inset 0 0 0 1px rgba(139, 92, 246, 0.22);
  }
  /* When active + in-chord, the cell glow leans purple (chord-aligned note) */
  .sequencer-grid .cell.active.in-chord {
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, calc(0.22 * var(--cv, 0.85))),
      inset 0 -1px 0 rgba(0, 0, 0, calc(0.25 * var(--cv, 0.85))),
      inset 0 0 0 1px rgba(139, 92, 246, 0.55),
      0 0 calc(10px * var(--cv, 0.85)) rgba(139, 92, 246, calc(0.45 * var(--cv, 0.85)));
  }
}