.river-action-feedback {
  position: fixed;
  inset: max(16px, env(safe-area-inset-top)) auto auto 50%;
  transform: translateX(-50%);
  width: min(520px, calc(100vw - 24px));
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text, #182235);
  z-index: 2147483647;
  pointer-events: none;
  font: 14px/1.5 sans-serif;
}
.river-action-feedback:empty { display: none; }
.river-action-feedback::backdrop { pointer-events: none; background: transparent; }
.river-action-feedback-item {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
  padding: 14px 16px;
  border: 1px solid var(--border, #d8dee8);
  border-left: 4px solid var(--primary, #3974d8);
  border-radius: 10px;
  background: var(--surface, #fff);
  box-shadow: 0 5px 20px rgb(0 0 0 / 18%);
  pointer-events: auto;
}
.river-action-feedback-item[data-tone="success"] { border-left-color: var(--success, #16804a); }
.river-action-feedback-item[data-tone="error"] { border-left-color: var(--danger, #c03636); }
.river-action-feedback-item[data-tone="warning"] { border-left-color: var(--warning, #b97813); }
.river-action-feedback-item > span { flex: 1; min-width: 0; overflow-wrap: anywhere; white-space: pre-line; }
.river-action-feedback-item > button {
  flex: none;
  min-width: 44px;
  min-height: 44px;
  padding: 6px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: inherit;
  font: inherit;
  cursor: pointer;
}
.river-action-feedback-item > button:focus-visible { outline: 2px solid currentColor; }