:root {
  --mig-bottom-signal-slot: 16px;
  --mig-bottom-activity-slot: 18px;
  --mig-bottom-signal-gap: 4px;
  --mig-bottom-signal-text: rgba(255, 255, 255, 0.62);
  --mig-bottom-signal-accent: #d7b46a;
  --mig-bottom-signal-motion: 160ms;
}

/* Shared ownership stops at the signal itself. The host app owns panel material,
 * action layout, button geometry, safe-area compensation and scroll behavior. */
[data-mig-bottom-signal="v1"] {
  box-sizing: border-box;
  display: grid;
  width: 100%;
  min-width: 0;
  height: var(--mig-bottom-signal-slot);
  min-height: var(--mig-bottom-signal-slot);
  margin: var(--mig-bottom-signal-gap) 0 0;
  padding: 0;
  grid-template-columns: var(--mig-bottom-activity-slot) minmax(0, 1fr) var(--mig-bottom-activity-slot);
  column-gap: 4px;
  place-items: center;
  overflow: hidden;
  color: var(--mig-bottom-signal-text);
  font: 500 11px/14px system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  text-align: center;
  transition: color var(--mig-bottom-signal-motion) ease, opacity var(--mig-bottom-signal-motion) ease;
}

[data-mig-bottom-signal-text] {
  display: block;
  grid-column: 2;
  width: 100%;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

[data-mig-bottom-activity] {
  grid-column: 3;
  box-sizing: border-box;
  display: inline-flex;
  width: var(--mig-bottom-activity-slot);
  min-width: var(--mig-bottom-activity-slot);
  height: 100%;
  align-items: center;
  justify-content: space-between;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--mig-bottom-signal-motion) ease;
}

[data-mig-bottom-activity] > i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.24;
}

[data-mig-bottom-signal="v1"][data-signal-active="true"] [data-mig-bottom-activity] {
  opacity: 1;
  visibility: visible;
}

[data-mig-bottom-signal="v1"][data-signal-active="true"] [data-mig-bottom-activity] > i {
  animation: migBottomSignalDot 960ms ease-in-out infinite;
}

[data-mig-bottom-signal="v1"][data-signal-active="true"] [data-mig-bottom-activity] > i:nth-child(2) { animation-delay: 160ms; }
[data-mig-bottom-signal="v1"][data-signal-active="true"] [data-mig-bottom-activity] > i:nth-child(3) { animation-delay: 320ms; }

[data-mig-bottom-signal="v1"][data-signal-kind="pending"],
[data-mig-bottom-signal="v1"][data-signal-kind="queued"],
[data-mig-bottom-signal="v1"][data-signal-kind="running"],
[data-mig-bottom-signal="v1"][data-signal-kind="saving"],
[data-mig-bottom-signal="v1"][data-signal-kind="canceling"],
[data-mig-bottom-signal="v1"][data-signal-kind="reconnecting"],
[data-mig-bottom-signal="v1"][data-signal-kind="info"] {
  color: color-mix(in srgb, var(--mig-bottom-signal-accent) 76%, white 24%);
}

[data-mig-bottom-signal="v1"][data-signal-kind="success"] { color: #83d6aa; }
[data-mig-bottom-signal="v1"][data-signal-kind="warning"] { color: #f0c979; }
[data-mig-bottom-signal="v1"][data-signal-kind="error"] { color: #ff9e9e; }

@media (prefers-reduced-motion: reduce) {
  [data-mig-bottom-signal="v1"],
  [data-mig-bottom-activity] { transition: none; }
  [data-mig-bottom-signal="v1"][data-signal-active="true"] [data-mig-bottom-activity] > i {
    animation: none;
    opacity: 0.72;
  }
}

@keyframes migBottomSignalDot {
  0%, 100% { opacity: 0.24; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-1px); }
}