/* FILE: css/messages.css */
.message-item {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  width: 100%;
  animation-duration: 0.25s;
  animation-fill-mode: both;
  contain: layout style paint;
}

.message-item.user {
  justify-content: flex-end;
  animation-name: slideInRight;
}

.message-item.assistant {
  justify-content: flex-start;
  animation-name: slideInLeft;
}

.message-item.user .message-shell {
  flex-direction: row-reverse;
}

.message-shell {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  max-width: min(85%, 680px);
  width: fit-content;
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: white;
  box-shadow: var(--shadow-sm);
}

.message-avatar.user-avatar {
  background: linear-gradient(135deg, var(--accent-primary), #857dff);
}

.message-avatar.ai-avatar {
  background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.25), transparent 42%), linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
}

.message-card {
  position: relative;
  min-width: 0;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.message-item.user .message-card {
  background: linear-gradient(180deg, rgba(108, 99, 255, 0.08), rgba(108, 99, 255, 0.02)), var(--bg-message-user);
  border-left: 3px solid var(--accent-primary);
}

.message-item.assistant .message-card {
  background: linear-gradient(180deg, rgba(0, 212, 255, 0.03), transparent), var(--bg-message-ai);
}

.message-card:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md);
}

.message-item.user .message-card:hover {
  box-shadow: var(--shadow-glow);
}

.message-meta-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
  min-height: 20px;
}

.message-item.user .message-meta-row {
  justify-content: flex-end;
}

.message-item.assistant .message-meta-row {
  justify-content: flex-start;
}

.message-timestamp {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
}

.message-actions {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  display: inline-flex;
  gap: 2px;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: all var(--transition-fast);
}

.message-card:hover .message-actions,
.message-card:focus-within .message-actions {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.message-action-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid transparent;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.message-action-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-subtle);
  background: var(--bg-hover);
}

.message-action-btn.danger:hover {
  color: var(--accent-danger);
}

.message-action-btn svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.message-content {
  color: var(--text-primary);
  font-size: var(--font-size-base);
  line-height: 1.75;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.message-streaming,
.message-rendered {
  contain: layout style;
}

.message-streaming {
  display: none;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
  will-change: contents;
}

.message-streaming.is-streaming::after {
  content: '▋';
  color: var(--accent-primary);
  animation: cursorBlink 0.8s step-end infinite;
  margin-left: 1px;
}

.message-rendered {
  will-change: auto;
}

.message-content pre {
  max-width: 100%;
  overflow-x: auto;
  font-size: var(--font-size-xs);
}

@media (min-width: 768px) {
  .message-content pre {
    font-size: var(--font-size-sm);
  }
}

.message-item.assistant .message-content {
  color: var(--text-ai);
}

.message-content > :first-child {
  margin-top: 0;
}

.message-content > :last-child {
  margin-bottom: 0;
}

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4 {
  line-height: 1.3;
  margin: var(--space-4) 0 var(--space-2);
  font-weight: 700;
  color: var(--text-primary);
}

.message-content h1 { font-size: 1.5rem; }
.message-content h2 { font-size: 1.35rem; }
.message-content h3 { font-size: 1.15rem; }
.message-content h4 { font-size: 1rem; }

.message-content p,
.message-content ul,
.message-content ol,
.message-content pre,
.message-content blockquote,
.message-content hr {
  margin: var(--space-3) 0;
}

.message-content ul,
.message-content ol {
  padding-left: 1.4rem;
}

.message-content ul {
  list-style: disc;
}

.message-content ol {
  list-style: decimal;
}

.message-content li + li {
  margin-top: 0.25rem;
}

.message-content strong {
  font-weight: 700;
  color: var(--text-primary);
}

.message-content em {
  font-style: italic;
}

.message-content a {
  color: var(--accent-secondary);
  text-decoration: underline;
  text-decoration-color: rgba(0, 212, 255, 0.3);
}

.message-content blockquote {
  border-left: 3px solid var(--accent-primary);
  padding-left: var(--space-3);
  color: var(--text-secondary);
}

.message-content hr {
  border: 0;
  border-top: 1px solid var(--border-subtle);
}

.message-content code:not(pre code) {
  background: rgba(108, 99, 255, 0.1);
  color: var(--text-code);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.message-content pre.math-fallback {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  font-family: var(--font-mono);
  overflow-x: auto;
}

.code-block {
  position: relative;
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  background: #0d1117;
  overflow: hidden;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
}

.code-lang {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.code-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.code-copy-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.code-scroll {
  overflow-x: auto;
}

.code-lines {
  counter-reset: line;
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  padding: 12px 0;
}

.code-line {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-3);
  padding: 0 12px;
  white-space: pre;
}

.code-line::before {
  counter-increment: line;
  content: counter(line);
  color: rgba(255, 255, 255, 0.25);
  text-align: right;
  user-select: none;
}

.code-line-content {
  min-width: max-content;
}

.message-content pre code {
  font-family: inherit;
  color: inherit;
}

@keyframes cursorBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.thinking-bubble {
  display: inline-flex;
  flex-direction: column;
  gap: var(--space-2);
  background: linear-gradient(90deg, rgba(255,255,255,0.02), rgba(108,99,255,0.06), rgba(255,255,255,0.02));
  background-size: 300% 100%;
  animation: shimmer 2.4s linear infinite;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  min-width: 220px;
}

.thinking-dots {
  display: inline-flex;
  gap: 6px;
  align-items: center;
}

.thinking-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-primary);
  animation: bounce 1.2s infinite ease-in-out;
}

.thinking-dot:nth-child(2) {
  animation-delay: 0.15s;
}

.thinking-dot:nth-child(3) {
  animation-delay: 0.3s;
}

.thinking-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.message-edit-box {
  width: 100%;
  min-height: 90px;
  border: 1px solid var(--border-accent);
  background: var(--bg-input);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  outline: none;
}

.message-edit-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.message-inline-btn {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.message-inline-btn.primary {
  background: var(--accent-primary);
  color: white;
}

.message-inline-btn.secondary {
  background: var(--bg-hover);
  color: var(--text-secondary);
}

.virtual-spacer {
  width: 100%;
  pointer-events: none;
}

.lazy-message-placeholder {
  border-radius: var(--radius-lg);
  background: linear-gradient(90deg, rgba(255,255,255,0.03), rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  background-size: 300% 100%;
  animation: shimmer 1.8s linear infinite;
  min-height: 88px;
}