/* ============================================================
   Spinner — animated loading indicator
   ============================================================ */
.ds-spinner {
  display: inline-flex;
  gap: 4px;
  align-items: center;
  height: 16px;
}
.ds-spinner span {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
}
@media (prefers-reduced-motion: no-preference) {
  .ds-spinner span { animation: ds-bounce 1.4s infinite ease-in-out; }
  .ds-spinner span:nth-child(1) { animation-delay: 0s; }
  .ds-spinner span:nth-child(2) { animation-delay: 0.18s; }
  .ds-spinner span:nth-child(3) { animation-delay: 0.36s; }
}

.ds-spinner-lg { height: 24px; gap: 6px; }
.ds-spinner-lg span { width: 6px; height: 6px; }

.ds-spinner-sm { height: 12px; gap: 2px; }
.ds-spinner-sm span { width: 2px; height: 2px; }

.ds-spinner-xs { height: 8px; gap: 1px; }
.ds-spinner-xs span { width: 1.5px; height: 1.5px; }

.ds-spinner-xl { height: 32px; gap: 8px; }
.ds-spinner-xl span { width: 8px; height: 8px; }

@keyframes ds-bounce {
  0%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-8px); }
}

/* ============================================================
   Skeleton — animated loading placeholder
   ============================================================ */
.ds-skeleton-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.ds-skeleton {
  background: linear-gradient(90deg, var(--bg-2) 25%, var(--bg-3) 50%, var(--bg-2) 75%);
  background-size: 200% 100%;
  animation: ds-shimmer 1.5s infinite;
  border-radius: var(--r-1);
}

@keyframes ds-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================================
   Alert — contextual message banner
   ============================================================ */
.ds-alert {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--r-1);
  background: var(--panel-1);
  border: 1px solid var(--rule-strong);
  color: var(--fg);
}

.ds-alert-info { --alert-tone: var(--sky); }
.ds-alert-success { --alert-tone: var(--green); }
.ds-alert-warn { --alert-tone: var(--amber); }
.ds-alert-error { --alert-tone: var(--warn); }

.ds-alert-icon {
  flex-shrink: 0;
  color: var(--alert-tone);
  font-weight: 600;
  min-width: 20px;
  text-align: center;
}

.ds-alert-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ds-alert-title {
  font-weight: 500;
  font-size: var(--fs-sm);
}

.ds-alert-message {
  font-size: var(--fs-sm);
  color: var(--fg-2);
}
.ds-alert-retry { margin-top: var(--space-2); }

.ds-alert-dismiss {
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--fg-3);
  padding: 0;
  font-size: 14px;
  line-height: 1;
  min-width: 20px;
  text-align: center;
  transition: color var(--dur-snap) var(--ease);
}
.ds-alert-dismiss:hover { color: var(--fg); }