.mp-hc {
  --hc-border: var(--mp-border, #dfe2e6);
  --hc-bg: var(--mp-green-50, #f0fde6);
  --hc-accent: var(--mp-green, #5fb425);
  --hc-ok: #3d8c14;
  --hc-err: #b91c1c;
  margin-bottom: 1rem;
}

.mp-hc-card {
  border: 1px solid var(--hc-border);
  border-radius: 16px;
  background: linear-gradient(160deg, #ffffff 0%, var(--mp-green-50, #f0fde6) 100%);
  padding: 0.85rem 1rem 1rem;
}

.mp-hc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.mp-hc-board {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(4.5rem, 1fr));
  gap: 0.5rem;
  min-height: 4.25rem;
}

.mp-hc-tray {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.65rem;
  min-height: 3.25rem;
  padding: 0.4rem;
  border-radius: 12px;
  border: 1px dashed var(--hc-border);
  background: rgba(255, 255, 255, 0.7);
}

.mp-hc-slot {
  min-height: 3.5rem;
  border: 2px dashed #c5ccd4;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.35rem;
  background: rgba(255, 255, 255, 0.85);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.mp-hc-slot[data-filled="1"] {
  border-style: solid;
  border-color: var(--hc-accent);
}

.mp-hc-slot.mp-hc-drop-over {
  border-color: var(--hc-accent);
  background: color-mix(in srgb, var(--hc-accent) 12%, #fff);
}

.mp-hc-slot-label {
  font-size: 0.7rem;
  color: var(--mp-neutral-600, #525252);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.mp-hc-piece {
  min-width: 3rem;
  min-height: 2.75rem;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--hc-border);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 1px 2px rgba(26, 26, 26, 0.06);
  cursor: grab;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1.05rem;
  user-select: none;
  touch-action: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.mp-hc-piece:focus-visible {
  outline: 3px solid var(--hc-accent);
  outline-offset: 2px;
}

.mp-hc-piece.is-selected {
  outline: 3px solid var(--hc-accent);
  outline-offset: 2px;
}

.mp-hc-piece.is-dragging {
  opacity: 0.55;
  cursor: grabbing;
}

.mp-hc-piece[data-placed="1"] {
  width: 100%;
}

.mp-hc.is-success .mp-hc-card {
  border-color: color-mix(in srgb, var(--hc-accent) 40%, #fff);
  background: linear-gradient(160deg, #f7fff0 0%, var(--mp-green-50, #f0fde6) 100%);
}

.mp-hc.is-success [data-hc-status] {
  color: var(--hc-ok);
  font-weight: 600;
}

.mp-hc.is-error [data-hc-status] {
  color: var(--hc-err);
}

@media (prefers-reduced-motion: reduce) {
  .mp-hc-piece,
  .mp-hc-slot {
    transition: none;
  }
}

@media (prefers-contrast: more) {
  .mp-hc-card,
  .mp-hc-slot,
  .mp-hc-piece {
    border-width: 2px;
  }
}