/* MailBoard D126B — professional AI working state.
   Uses the existing AssistantProcessingState markup; no fake answer text. */
.assistant-processing-state.assistant-processing-demo {
  --ai-loader-accent: var(--accent, var(--demo-red-bright, #dc1736));
  --ai-loader-track: color-mix(in srgb, var(--ai-loader-accent) 16%, transparent);
  --ai-loader-soft: color-mix(in srgb, var(--ai-loader-accent) 8%, transparent);
  position: relative;
  grid-template-columns: 44px minmax(0, 1fr);
  align-items: center;
  gap: 13px;
  min-height: 78px;
  padding: 15px 16px 20px;
  overflow: hidden;
  background:
    radial-gradient(circle at 24px 24px, var(--ai-loader-soft), transparent 54px),
    color-mix(in srgb, var(--surface, #fff) 97%, var(--ai-loader-accent) 3%);
  border: 1px solid color-mix(in srgb, var(--ai-loader-accent) 20%, var(--border, #e7c9cf));
  border-radius: 16px;
  box-shadow:
    0 10px 30px color-mix(in srgb, #000 7%, transparent),
    inset 0 1px 0 color-mix(in srgb, #fff 44%, transparent);
}

/* Standard indeterminate circular loader: a clean ring with one accent arc. */
.assistant-processing-state .assistant-thinking-mark {
  position: relative;
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  flex: 0 0 40px;
  isolation: isolate;
}

.assistant-processing-state .assistant-thinking-mark::before {
  content: "";
  position: absolute;
  inset: 2px;
  z-index: -1;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--ai-loader-accent) 12%, transparent), transparent 68%);
  animation: mailboard-ai-loader-breathe 1.8s ease-in-out infinite;
}

.assistant-processing-state .assistant-thinking-mark i:first-child {
  display: block;
  box-sizing: border-box;
  width: 22px;
  height: 22px;
  margin: 0;
  background: transparent;
  border: 2.5px solid color-mix(in srgb, var(--ai-loader-accent) 20%, transparent);
  border-top-color: var(--ai-loader-accent);
  border-right-color: color-mix(in srgb, var(--ai-loader-accent) 72%, #fff 28%);
  border-radius: 50%;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--ai-loader-accent) 4%, transparent);
  animation: mailboard-ai-loader-spin .78s linear infinite;
}

.assistant-processing-state .assistant-thinking-mark i:nth-child(2),
.assistant-processing-state .assistant-thinking-mark i:nth-child(3) {
  display: none;
}

.assistant-processing-state.assistant-processing-demo > div {
  min-width: 0;
  gap: 4px;
}

.assistant-processing-state.assistant-processing-demo > div > strong {
  color: var(--text, #18181b);
  font-size: .92rem;
  font-weight: 760;
  letter-spacing: -.01em;
}

.assistant-processing-state.assistant-processing-demo > div > span:not(.assistant-processing-meta):not(.assistant-smart-continuation-confirmed) {
  color: var(--text-muted, #75676b);
  font-size: .82rem;
  line-height: 1.45;
  animation: mailboard-ai-stage-in .26s ease-out both;
}

.assistant-processing-state .assistant-processing-meta {
  color: var(--text-muted, #8a7d80);
  font-size: .72rem;
  font-variant-numeric: tabular-nums;
  opacity: .88;
}

.assistant-processing-state .assistant-processing-track {
  right: 16px;
  bottom: 9px;
  left: 16px;
  height: 3px;
  overflow: hidden;
  background: var(--ai-loader-track);
  border-radius: 999px;
}

.assistant-processing-state .assistant-processing-track > i {
  position: relative;
  display: block;
  min-width: 36px;
  height: 100%;
  overflow: hidden;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--ai-loader-accent) 74%, transparent),
    var(--ai-loader-accent));
  border-radius: inherit;
  transition: width .55s cubic-bezier(.22,.7,.2,1);
  box-shadow: 0 0 10px color-mix(in srgb, var(--ai-loader-accent) 30%, transparent);
}

.assistant-processing-state .assistant-processing-track > i::after {
  content: "";
  position: absolute;
  inset: 0;
  width: 42%;
  transform: translateX(-140%);
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.78), transparent);
  animation: mailboard-ai-track-sheen 1.55s ease-in-out infinite;
}

:root[data-theme="dark"] .assistant-processing-state.assistant-processing-demo {
  background:
    radial-gradient(circle at 24px 24px, color-mix(in srgb, var(--ai-loader-accent) 13%, transparent), transparent 58px),
    color-mix(in srgb, var(--surface, #111116) 96%, var(--ai-loader-accent) 4%);
  border-color: color-mix(in srgb, var(--ai-loader-accent) 24%, var(--border, #3a2a2e));
  box-shadow:
    0 14px 36px rgba(0,0,0,.24),
    inset 0 1px 0 rgba(255,255,255,.035);
}

:root[data-theme="dark"] .assistant-processing-state.assistant-processing-demo > div > strong {
  color: var(--text, #f8f2f4);
}

:root[data-theme="dark"] .assistant-processing-state.assistant-processing-demo > div > span:not(.assistant-processing-meta):not(.assistant-smart-continuation-confirmed),
:root[data-theme="dark"] .assistant-processing-state .assistant-processing-meta {
  color: var(--text-muted, #c7b9bd);
}

@keyframes mailboard-ai-loader-spin {
  to { transform: rotate(360deg); }
}

@keyframes mailboard-ai-loader-breathe {
  0%, 100% { transform: scale(.92); opacity: .5; }
  50% { transform: scale(1.08); opacity: 1; }
}

@keyframes mailboard-ai-track-sheen {
  0%, 18% { transform: translateX(-140%); opacity: 0; }
  35% { opacity: .95; }
  78%, 100% { transform: translateX(320%); opacity: 0; }
}

@keyframes mailboard-ai-stage-in {
  from { opacity: 0; transform: translateY(2px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .assistant-processing-state .assistant-thinking-mark::before,
  .assistant-processing-state .assistant-thinking-mark i:first-child,
  .assistant-processing-state .assistant-processing-track > i::after,
  .assistant-processing-state.assistant-processing-demo > div > span {
    animation: none !important;
  }
  .assistant-processing-state .assistant-processing-track > i {
    transition: none;
  }
}