.assistant-loading .bubble {
  display: inline-grid;
  min-width: 0;
  padding: 12px 14px 10px;
  overflow: hidden;
  background: linear-gradient(135deg, #ffffff, #f7faff);
  border-color: #cfdced;
  box-shadow: 0 8px 22px rgba(31, 45, 61, 0.08);
}

.loading-status-panel {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.loading-spinner {
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  border: 3px solid #dce8f8;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: loading-spin 0.9s linear infinite;
  box-shadow: inset 0 0 0 3px rgba(23, 105, 224, 0.03);
}

.loading-status-panel strong {
  color: var(--text);
  font-size: 13px;
  line-height: 1.3;
  white-space: nowrap;
}

.loading-progress {
  --loading-stage: 1;
  position: relative;
  display: block;
  height: 3px;
  margin-top: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: #e7eef8;
}

.loading-progress i {
  position: absolute;
  inset: 0 auto 0 0;
  width: calc(18% + (var(--loading-stage) * 16%));
  max-width: 88%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), #69a7ff, var(--primary));
  background-size: 220% 100%;
  animation: loading-shimmer 1.8s linear infinite;
  transition: width 0.55s ease;
}

@keyframes loading-spin {
  to { transform: rotate(360deg); }
}

@keyframes loading-shimmer {
  from { background-position: 200% 0; }
  to { background-position: -20% 0; }
}

@media (max-width: 720px) {
  .assistant-loading .bubble {
    padding: 11px 12px 9px;
  }

  .loading-status-panel {
    gap: 8px;
  }

  .loading-spinner {
    width: 25px;
    height: 25px;
    flex-basis: 25px;
  }

  .loading-status-panel strong {
    font-size: 12px;
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .loading-spinner,
  .loading-progress i {
    animation: none;
  }
}