/* ============================================================
   v6 AI Variations — full-screen overlay with 4 candidate cards
   ============================================================
*/

@layer v6-components {

  .v6-variations {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal, 900);
    display: flex;
    align-items: center;
    justify-content: center;

    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-base, 180ms) var(--ease-out-quart);
  }
  .v6-variations--visible {
    opacity: 1;
    pointer-events: auto;
  }

  .v6-variations__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
  }

  .v6-variations__card {
    position: relative;
    width: min(960px, calc(100vw - 32px));
    max-height: calc(100vh - 64px);
    display: flex;
    flex-direction: column;
    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));
    overflow: hidden;
    transform: scale(0.96);
    transition: transform var(--duration-base, 180ms) var(--ease-out-quart);
  }
  .v6-variations--visible .v6-variations__card {
    transform: scale(1);
  }

  /* ============================================================
     Header
     ============================================================ */
  .v6-variations__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--v6-border-faint, rgba(255,255,255,0.04));
  }
  .v6-variations__title {
    display: inline-flex;
    align-items: center;
    gap: 12px;
  }
  .v6-variations__title .v6-icon {
    color: var(--accent-primary, #8b5cf6);
  }
  .v6-variations__title h2 {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary, #fafafa);
    letter-spacing: -0.01em;
  }
  .v6-variations__subtitle {
    color: var(--text-muted, #71717a);
    font-size: 12px;
    font-style: italic;
  }
  .v6-variations__close {
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--v6-border-faint, rgba(255,255,255,0.04));
    border-radius: var(--radius-sm, 4px);
    color: var(--text-muted, #71717a);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background var(--duration-fast, 120ms), color var(--duration-fast, 120ms);
  }
  .v6-variations__close:hover {
    background: var(--surface-500, #27272b);
    color: var(--text-primary, #fafafa);
  }

  /* ============================================================
     Body
     ============================================================ */
  .v6-variations__body {
    padding: 16px;
    overflow-y: auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    min-height: 320px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
  }
  .v6-variations__body::-webkit-scrollbar { width: 8px; }
  .v6-variations__body::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.10); border-radius: 4px;
  }

  /* Loading state */
  .v6-variations__loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 80px 20px;
    color: var(--text-secondary, #a1a1aa);
    text-align: center;
  }
  .v6-variations__loading-spinner {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: conic-gradient(
      from 0deg,
      rgba(139, 92, 246, 0.0) 0deg,
      rgba(139, 92, 246, 1.0) 270deg,
      rgba(139, 92, 246, 0.0) 360deg
    );
    mask: radial-gradient(farthest-side, transparent calc(100% - 4px), #000 calc(100% - 4px));
    -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 4px), #000 calc(100% - 4px));
    animation: v6-variations-spin 0.9s linear infinite;
  }
  @keyframes v6-variations-spin { to { transform: rotate(360deg); } }
  .v6-variations__loading p {
    margin: 0;
    font-size: 13px;
  }
  .v6-variations__loading-hint {
    color: var(--text-muted, #71717a);
    font-size: 11px;
  }

  /* Error state */
  .v6-variations__error {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 60px 20px;
    color: var(--accent-danger, #ef4444);
    text-align: center;
  }

  /* ============================================================
     Variation card
     ============================================================ */
  .v6-variation-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 14px;
    background: var(--surface-400, #1f1f23);
    border: 1px solid var(--v6-border, rgba(255,255,255,0.08));
    border-radius: var(--radius-md, 6px);
    transition: border-color var(--duration-fast, 120ms),
                background var(--duration-fast, 120ms),
                box-shadow var(--duration-fast, 120ms);
  }
  .v6-variation-card:hover {
    border-color: var(--v6-border-strong, rgba(255,255,255,0.14));
    background: var(--surface-500, #27272b);
  }
  .v6-variation-card--auditioning {
    border-color: var(--accent-success, #22c55e);
    box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.4) inset,
                0 0 24px rgba(34, 197, 94, 0.25);
  }

  .v6-variation-card__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .v6-variation-card__theme {
    font-family: var(--font-sans, system-ui);
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary, #fafafa);
    letter-spacing: 0.01em;
  }
  .v6-variation-card__letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    background: rgba(139, 92, 246, 0.15);
    color: var(--accent-primary, #8b5cf6);
    border: 1px solid rgba(139, 92, 246, 0.35);
    border-radius: var(--radius-sm, 4px);
    font-family: var(--font-mono, monospace);
    font-size: 13px;
    font-weight: 700;
  }

  /* Preview grid */
  .v6-variation-card__preview {
    padding: 8px;
    background: rgba(0, 0, 0, 0.40);
    border-radius: var(--radius-sm, 4px);
  }
  .v6-variation-card__preview-empty {
    height: 64px;
    background: rgba(0, 0, 0, 0.30);
    border-radius: var(--radius-sm, 4px);
  }
  .v6-variation-card__grid {
    display: flex;
    flex-direction: column;
    gap: 2px;
    height: 56px;
  }
  .v6-variation-card__row {
    display: grid;
    grid-template-columns: repeat(16, 1fr);
    gap: 1px;
    flex: 1;
    min-height: 0;
  }
  .v6-variation-card__cell {
    background: rgba(255, 255, 255, 0.04);
    border-radius: 1px;
  }
  .v6-variation-card__row .v6-variation-card__cell:nth-child(4n) {
    background: rgba(255, 255, 255, 0.06);
  }
  .v6-variation-card__cell--active {
    background: var(--row-color, var(--accent-primary, #8b5cf6));
    opacity: var(--cell-op, 0.85);
    box-shadow: 0 0 4px var(--row-color, var(--accent-primary, #8b5cf6));
  }

  .v6-variation-card__notes {
    font-size: 11px;
    color: var(--text-secondary, #a1a1aa);
    line-height: 1.4;
    min-height: 30px;
    font-style: italic;
  }

  .v6-variation-card__actions {
    display: flex;
    justify-content: space-between;
    gap: 6px;
    margin-top: auto;
  }
  .v6-variation-card__actions .btn {
    flex: 1;
  }

  /* ============================================================
     Footer
     ============================================================ */
  .v6-variations__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 16px;
    background: var(--surface-200, #111113);
    border-top: 1px solid var(--v6-border-faint, rgba(255,255,255,0.04));
  }
  .v6-variations__hint {
    font-size: 11px;
    color: var(--text-muted, #71717a);
    line-height: 1.4;
    flex: 1;
  }
  .v6-variations__hint strong {
    color: var(--text-secondary, #a1a1aa);
    font-weight: 600;
  }

  /* Reduced motion */
  @media (prefers-reduced-motion: reduce) {
    .v6-variations__loading-spinner { animation: none; }
  }
}