/* ============================================
   RenDS — Carbon for AI Patterns
   ============================================
   Design patterns for AI-generated content.
   Inspired by IBM Carbon for AI.

   Components:
   - AI Message bubble (streaming + complete)
   - AI Typing indicator
   - AI Citation / Source reference
   - AI Confidence indicator
   - AI Regenerate action
   - AI Prompt input
   - AI Slug (inline AI label)

   All CSS-only where possible, minimal JS for
   streaming text animation.
   ============================================ */

/* ═══════════════════════════════════════════════
   AI SLUG — Inline "AI" label
   ═══════════════════════════════════════════════ */
.ren-ai-slug {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-0-5) var(--space-2);
  font-size: var(--caption-sm-size);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-ai);
  background: color-mix(in srgb, var(--color-ai) 10%, transparent);
  border-radius: var(--radius-sm);
  line-height: 1;
}

.ren-ai-slug::before {
  content: '✦';
  font-size: 0.75em;
}

/* ═══════════════════════════════════════════════
   AI MESSAGE — Chat bubble for AI responses
   ═══════════════════════════════════════════════ */
.ren-ai-message {
  position: relative;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-ai-subtle) 70%, var(--color-surface-raised));
  border: var(--stroke-1) solid var(--color-border);
  line-height: var(--leading-relaxed);
}

.ren-ai-message-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  font-size: var(--label-size);
}

.ren-ai-message-content {
  font-size: var(--body-size);
  color: var(--color-text);
}

.ren-ai-message-content p:last-child {
  margin-bottom: 0;
}

.ren-ai-message-footer {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: var(--stroke-1) solid var(--color-border-muted);
  font-size: var(--caption-size);
  color: var(--color-text-muted);
}

/* ═══════════════════════════════════════════════
   AI STREAMING — Typing animation
   ═══════════════════════════════════════════════ */
.ren-ai-streaming .ren-ai-message-content::after {
  content: '▊';
  display: inline;
  animation: ren-ai-blink 0.8s step-end infinite;
  color: var(--color-ai);
  margin-inline-start: 1px;
}

@keyframes ren-ai-blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .ren-ai-streaming .ren-ai-message-content::after {
    animation: none;
    opacity: 0.7;
  }
}

/* ═══════════════════════════════════════════════
   AI TYPING INDICATOR — "AI is thinking..."
   ═══════════════════════════════════════════════ */
.ren-ai-typing {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--caption-size);
  color: var(--color-text-muted);
}

.ren-ai-typing-dots {
  display: inline-flex;
  gap: 3px;
}

.ren-ai-typing-dots span {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-ai);
  animation: ren-ai-dot-bounce 1.4s ease-in-out infinite;
}

.ren-ai-typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.ren-ai-typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes ren-ai-dot-bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
  40%           { transform: translateY(-4px); opacity: 1; }
}

@keyframes ren-ai-dot-fade {
  0%, 80%, 100% { opacity: 0.3; }
  40%           { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .ren-ai-typing-dots span {
    animation: ren-ai-dot-fade 1.4s ease-in-out infinite;
  }
}

/* ═══════════════════════════════════════════════
   AI CITATION — Source reference
   ═══════════════════════════════════════════════ */
.ren-ai-citation {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-0-5) var(--space-2);
  font-size: var(--caption-sm-size);
  font-weight: var(--weight-medium);
  color: var(--color-ai);
  background: color-mix(in srgb, var(--color-ai) 8%, transparent);
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--duration-tactile) var(--ease-enter);
  vertical-align: super;
  line-height: 1;
}

.ren-ai-citation:hover {
  background: color-mix(in srgb, var(--color-ai) 14%, transparent);
}

/* Citation list at bottom of message */
.ren-ai-sources {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: var(--stroke-1) solid var(--color-border-muted);
}

.ren-ai-source {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-surface-sunken);
  font-size: var(--caption-size);
  text-decoration: none;
  color: var(--color-text);
  transition: background var(--duration-tactile) var(--ease-enter);
}

.ren-ai-source:hover {
  background: var(--color-fill);
}

.ren-ai-source-number {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--caption-sm-size);
  font-weight: var(--weight-bold);
  color: var(--color-ai);
  background: color-mix(in srgb, var(--color-ai) 10%, transparent);
  border-radius: var(--radius-sm);
}

.ren-ai-source-title {
  font-weight: var(--weight-medium);
}

.ren-ai-source-url {
  color: var(--color-text-muted);
  font-size: var(--caption-sm-size);
}

/* ═══════════════════════════════════════════════
   AI CONFIDENCE — Certainty indicator
   ═══════════════════════════════════════════════ */
.ren-ai-confidence {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--caption-size);
  color: var(--color-text-muted);
}

.ren-ai-confidence-bar {
  width: 3rem;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--color-fill);
  overflow: hidden;
}

.ren-ai-confidence-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--duration-state) var(--ease-enter);
}

.ren-ai-confidence[data-level="high"] .ren-ai-confidence-fill {
  width: 100%;
  background: var(--color-success);
}

.ren-ai-confidence[data-level="medium"] .ren-ai-confidence-fill {
  width: 66%;
  background: var(--color-warning);
}

.ren-ai-confidence[data-level="low"] .ren-ai-confidence-fill {
  width: 33%;
  background: var(--color-danger);
}

/* ═══════════════════════════════════════════════
   AI ACTIONS — Regenerate, Copy, Feedback
   ═══════════════════════════════════════════════ */
.ren-ai-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.ren-ai-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--caption-size);
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-tactile) var(--ease-enter);
  min-height: var(--size-sm);
}

.ren-ai-action:hover {
  color: var(--color-text);
  background: var(--color-fill);
}

.ren-ai-action:active {
  transform: scale(0.95);
}

.ren-ai-action[data-active="true"] {
  color: var(--color-ai);
}

/* Feedback buttons (thumbs up/down) */
.ren-ai-action-thumbs {
  display: inline-flex;
  gap: 0;
  border: var(--stroke-1) solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.ren-ai-action-thumbs .ren-ai-action {
  border-radius: 0;
  padding: var(--space-1) var(--space-2);
}

.ren-ai-action-thumbs .ren-ai-action + .ren-ai-action {
  border-inline-start: var(--stroke-1) solid var(--color-border);
}

/* ═══════════════════════════════════════════════
   AI PROMPT INPUT — Chat-style input
   ═══════════════════════════════════════════════ */
.ren-ai-prompt {
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: var(--stroke-1) solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  transition: border-color var(--duration-tactile) var(--ease-enter);
}

.ren-ai-prompt:focus-within {
  border-color: var(--color-ai);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-ai) 15%, transparent);
}

.ren-ai-prompt-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: var(--body-size);
  color: var(--color-text);
  resize: none;
  outline: none;
  min-height: 1.5rem;
  max-height: 8rem;
  field-sizing: content;
  line-height: var(--leading-normal);
}

.ren-ai-prompt-input::placeholder {
  color: var(--color-text-muted);
}

.ren-ai-prompt-send {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--size-md);
  height: var(--size-md);
  border: none;
  border-radius: var(--radius-full);
  background: var(--color-ai);
  color: var(--color-on-ai);
  cursor: pointer;
  transition: all var(--duration-tactile) var(--ease-enter);
  font-size: var(--text-lg);
}

.ren-ai-prompt-send:hover {
  background: var(--color-ai-hover);
  transform: scale(1.05);
}

.ren-ai-prompt-send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* ═══════════════════════════════════════════════
   AI SKELETON — Loading placeholder for AI
   ═══════════════════════════════════════════════ */
.ren-ai-skeleton {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-ai-subtle) 55%, var(--color-surface-raised));
  border: var(--stroke-1) solid var(--color-border-muted);
}

.ren-ai-skeleton-line {
  height: 0.875rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(
    90deg,
    var(--color-fill) 25%,
    color-mix(in srgb, var(--color-ai) 6%, var(--color-fill)) 50%,
    var(--color-fill) 75%
  );
  background-size: 200% 100%;
  animation: ren-ai-shimmer 1.5s ease-in-out infinite;
}

.ren-ai-skeleton-line + .ren-ai-skeleton-line {
  margin-top: var(--space-2);
}

.ren-ai-skeleton-line:last-child {
  width: 60%;
}

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

@media (prefers-reduced-motion: reduce) {
  .ren-ai-skeleton-line {
    animation: none;
  }
}

/* ═══════════════════════════════════════════════
   AI ERROR — Message failure state
   ═══════════════════════════════════════════════ */
.ren-ai-error {
  position: relative;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-danger) 6%, var(--color-surface-raised));
  border: var(--stroke-1) solid color-mix(in srgb, var(--color-danger) 30%, transparent);
  display: grid;
  gap: var(--space-2);
}

.ren-ai-error-message {
  color: var(--color-text);
  font-size: var(--body-size);
  line-height: 1.5;
}

.ren-ai-error-message::before {
  content: '⚠ ';
  color: var(--color-danger);
  margin-inline-end: var(--space-1);
}

/* ═══════════════════════════════════════════════
   AI ACTION VARIANTS — Regenerate, edit-and-resend
   These extend the existing .ren-ai-action base.
   ═══════════════════════════════════════════════ */
.ren-ai-action-regenerate::before {
  content: '↻';
  margin-inline-end: var(--space-1);
  font-size: 1.1em;
  display: inline-block;
  /* Subtle hint that this re-runs inference */
  transition: transform var(--duration-state, 200ms) var(--ease-enter, ease);
}

.ren-ai-action-regenerate:hover::before {
  transform: rotate(-45deg);
}

.ren-ai-action-edit::before {
  content: '✎';
  margin-inline-end: var(--space-1);
  font-size: 1.05em;
}

@media (prefers-reduced-motion: reduce) {
  .ren-ai-action-regenerate::before {
    transition: none;
  }
}

/* ═══════════════════════════════════════════════
   AI FILE CHIP — Uploaded file reference
   Compact pill showing a file the user attached,
   with icon, name, size, and remove affordance.
   ═══════════════════════════════════════════════ */
.ren-ai-file-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background: var(--color-surface-raised);
  border: var(--stroke-1) solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--caption-size);
  max-width: 220px;
}

.ren-ai-file-chip-icon {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  color: var(--color-text-muted);
  display: grid;
  place-items: center;
}

.ren-ai-file-chip-name {
  flex: 1 1 auto;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--color-text);
  font-weight: var(--weight-medium);
}

.ren-ai-file-chip-size {
  flex-shrink: 0;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--caption-sm-size);
}

.ren-ai-file-chip-remove {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  display: grid;
  place-items: center;
  border: 0;
  background: transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  padding: 0;
}

.ren-ai-file-chip-remove:hover,
.ren-ai-file-chip-remove:focus-visible {
  background: var(--color-fill);
  color: var(--color-text);
}

.ren-ai-file-chip-remove:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

/* ═══════════════════════════════════════════════
   AI TOOL CALL — Model invoking a tool / function
   Collapsible block built on native <details>
   so JS is optional. Status via data-status.
   ═══════════════════════════════════════════════ */
.ren-ai-tool-call {
  border: var(--stroke-1) solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-raised);
  margin-block: var(--space-2);
  overflow: hidden;
}

.ren-ai-tool-call-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-sunken);
  font-size: var(--caption-size);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.ren-ai-tool-call-header::-webkit-details-marker { display: none; }

.ren-ai-tool-call-header::before {
  content: '▸';
  font-size: 0.75em;
  color: var(--color-text-muted);
  transition: transform var(--duration-state, 200ms) var(--ease-enter, ease);
}

.ren-ai-tool-call[open] > .ren-ai-tool-call-header::before {
  transform: rotate(90deg);
}

@media (prefers-reduced-motion: reduce) {
  .ren-ai-tool-call-header::before {
    transition: none;
  }
}

.ren-ai-tool-call-name {
  font-family: var(--font-mono);
  color: var(--color-text);
}

.ren-ai-tool-call-status {
  margin-inline-start: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--caption-sm-size);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border: var(--stroke-1) solid transparent;
}

.ren-ai-tool-call[data-status="pending"] .ren-ai-tool-call-status {
  color: var(--color-text-muted);
  background: var(--color-fill);
}

.ren-ai-tool-call[data-status="running"] .ren-ai-tool-call-status {
  color: var(--color-warning);
  background: color-mix(in srgb, var(--color-warning) 15%, transparent);
}

.ren-ai-tool-call[data-status="success"] .ren-ai-tool-call-status {
  color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 15%, transparent);
}

.ren-ai-tool-call[data-status="error"] .ren-ai-tool-call-status {
  color: var(--color-danger);
  background: color-mix(in srgb, var(--color-danger) 15%, transparent);
}

.ren-ai-tool-call-args,
.ren-ai-tool-call-result {
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--caption-size);
  line-height: 1.5;
  color: var(--color-text-secondary);
  white-space: pre-wrap;
  overflow-x: auto;
}

.ren-ai-tool-call-args {
  border-bottom: var(--stroke-1) solid var(--color-border-muted);
}

.ren-ai-tool-call-result {
  background: var(--color-surface);
}

.ren-ai-tool-call[data-status="error"] .ren-ai-tool-call-result {
  background: color-mix(in srgb, var(--color-danger) 4%, var(--color-surface));
  color: var(--color-text);
}