.card-pair {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-md);
  padding-bottom: var(--space-sm);
  min-height: 0;
}

.card-pair-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
  min-height: 0;
}

.card-wrapper {
  display: flex;
  min-height: 0;
  transition: flex-grow var(--duration-card) var(--ease-spring);
}

.card-wrapper .card {
  flex: 1;
  width: 100%;
}

/* Empty state */
.card-pair--empty {
  align-items: center;
  justify-content: center;
}

.empty-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  width: 100%;
  max-width: 320px;
  animation: hintFadeIn 600ms var(--ease-smooth);
}

.card-pair-empty-text {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--color-text);
  text-align: center;
}

.empty-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.empty-btn {
  width: 100%;
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--duration-fast) var(--ease-smooth);
}

.empty-btn:active {
  background: rgba(255, 255, 255, 0.12);
}

.empty-btn--primary {
  background: linear-gradient(135deg, var(--color-card-a-to), var(--color-card-b-to));
  border-color: transparent;
  font-weight: 600;
}

.empty-btn--primary:active {
  transform: scale(0.97);
}