/* ==========================================================================
   byte-grid.css — 4x4 byte grid for AES state visualization
   ========================================================================== */

.byte-grid {
  display: grid;
  grid-template-columns: repeat(4, var(--byte-cell-size));
  grid-template-rows: repeat(4, var(--byte-cell-size));
  gap: var(--space-xs);
}

.byte-grid__cell {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--byte-cell-size);
  height: var(--byte-cell-size);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--space-xs);
  font-size: var(--font-size-sm);
  font-family: var(--font-mono);
  text-transform: lowercase;
  transition: background-color var(--transition-step),
              transform var(--transition-step),
              border-color var(--transition-step);
}

.byte-grid__cell--changed {
  background-color: var(--color-highlight);
  color: var(--color-bg);
  border-color: var(--color-highlight);
  transform: scale(1.1);
  font-weight: 700;
}

/* --- Grid labels --- */
.byte-grid-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.byte-grid-wrapper__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 600;
}

/* --- Row labels for ShiftRows visualization --- */
.byte-grid-with-labels {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-xs) var(--space-sm);
  align-items: center;
}

.byte-grid__row-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

/* --- Round key mini grid --- */
.round-key-mini {
  display: grid;
  grid-template-columns: repeat(4, calc(var(--space-lg) - var(--space-xs)));
  gap: 2px;
  margin-bottom: var(--space-sm);
}

.round-key-mini__cell {
  display: flex;
  align-items: center;
  justify-content: center;
  width: calc(var(--space-lg) - var(--space-xs));
  height: calc(var(--space-lg) - var(--space-xs));
  background-color: var(--color-bg);
  border-radius: 2px;
  font-size: 0.625rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
}

.round-key-mini__cell--active {
  background-color: var(--color-highlight-dim);
  color: var(--color-highlight);
}

.round-key-entry {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.round-key-entry:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.round-key-entry__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.round-key-entry--active .round-key-entry__label {
  color: var(--color-highlight);
  font-weight: 600;
}

/* --- XOR visualization --- */
.xor-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.xor-display__operator {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
}

.xor-display__separator {
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
}