.grid-container {
  width: 100%;
  aspect-ratio: 1;
  max-width: 340px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: var(--cell-gap);
  padding: 4px;
}

.cell {
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 2px solid rgba(255,255,255,0.04);
  transition: transform 0.1s ease, border-color 0.15s ease, background 0.15s ease;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.cell::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.cell:active {
  transform: scale(0.92);
}

/* Lit state — pattern showing */
.cell.lit {
  border-color: rgba(255,255,255,0.2);
  box-shadow: 0 0 16px rgba(255,255,255,0.15);
}

/* Color assignments */
.cell[data-color="0"].lit, .cell[data-color="0"].correct { background: var(--c0); }
.cell[data-color="1"].lit, .cell[data-color="1"].correct { background: var(--c1); }
.cell[data-color="2"].lit, .cell[data-color="2"].correct { background: var(--c2); }
.cell[data-color="3"].lit, .cell[data-color="3"].correct { background: var(--c3); }
.cell[data-color="4"].lit, .cell[data-color="4"].correct { background: var(--c4); }
.cell[data-color="5"].lit, .cell[data-color="5"].correct { background: var(--c5); }
.cell[data-color="6"].lit, .cell[data-color="6"].correct { background: var(--c6); }
.cell[data-color="7"].lit, .cell[data-color="7"].correct { background: var(--c7); }

/* Correct tap */
.cell.correct {
  border-color: rgba(255,255,255,0.3);
  animation: cellPop 0.25s ease-out;
}

/* Wrong tap */
.cell.wrong {
  background: var(--danger) !important;
  border-color: var(--danger);
  animation: cellShake 0.3s ease;
}

/* Disabled during showing / lockout */
.grid-container.disabled .cell {
  pointer-events: none;
}

/* Progress dots — show which step in pattern */
.pattern-progress {
  display: flex;
  gap: 6px;
  justify-content: center;
  align-items: center;
  min-height: 20px;
  flex-wrap: wrap;
  max-width: 340px;
}

.progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid rgba(255,255,255,0.1);
  transition: background 0.2s ease, transform 0.2s ease;
}

.progress-dot.filled {
  background: var(--success);
  border-color: var(--success);
  transform: scale(1.2);
}

.progress-dot.current {
  border-color: var(--accent-glow);
  box-shadow: 0 0 6px var(--accent-glow);
}

.progress-dot.wrong-dot {
  background: var(--danger);
  border-color: var(--danger);
}

@keyframes cellPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

@keyframes cellShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}