/* Tilbageblik */
.nback-wrap {
  width: min(100%, 420px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.nback-card {
  width: 100%;
  aspect-ratio: 1.2;
  background: var(--surface);
  border: 3px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: 0 2px 6px #0002;
  transition: transform 0.12s, border-color 0.12s;
}
.nback-card.flash-good {
  border-color: var(--good);
  background: #f0fdf4;
  transform: scale(1.02);
}
.nback-card.flash-bad {
  border-color: var(--bad);
  background: #fef2f2;
  transform: scale(0.98);
}
.nback-symbol {
  font-size: 5rem;
  line-height: 1;
  user-select: none;
}
.nback-label {
  margin-top: 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--muted);
}
.nback-prompt {
  font-size: 1rem;
  font-weight: 600;
  min-height: 1.5em;
  text-align: center;
}
.nback-buttons {
  display: flex;
  gap: 12px;
  width: 100%;
}
.nback-btn {
  flex: 1;
  padding: 16px;
  font-size: 1.2rem;
  font-weight: 700;
  border-radius: var(--radius);
  border: 2px solid #ccc;
  background: var(--surface);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.nback-btn small {
  font-size: 0.75rem;
  font-weight: normal;
  color: var(--muted);
}
.nback-btn.yes {
  border-color: var(--accent);
  color: var(--accent);
}
.nback-btn.yes:active, .nback-btn.yes.pressed {
  background: var(--accent);
  color: #fff;
}
.nback-btn.no {
  border-color: #64748b;
  color: #334155;
}
.nback-btn.no:active, .nback-btn.no.pressed {
  background: #64748b;
  color: #fff;
}