#chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: var(--chat-max-width);
  width: 100%;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
}

.chat-welcome {
  margin: auto;
  text-align: center;
}

.chat-welcome h2 {
  font-size: var(--text-xl);
  line-height: var(--leading-tight);
}

.chat-welcome p {
  color: var(--color-ink-muted);
  margin-top: var(--space-2);
}

.message {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 100%;
}

.message--user {
  align-items: flex-end;
}

.message--assistant,
.message--tool {
  align-items: flex-start;
}

.message-body {
  max-width: min(100%, 680px);
}

.message--user .message-body {
  background: var(--color-paper-raised);
  border: var(--border-thin);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
}

.message--tool .message-body {
  background: var(--color-paper-sunken);
  border-left: 3px solid var(--color-ink-faint);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
}

.tool-label {
  display: block;
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  margin-bottom: var(--space-2);
}

.message-content {
  overflow-wrap: anywhere;
}

.message-content h3 { margin: var(--space-4) 0 var(--space-2); }
.message-content ul,
.message-content ol { padding-left: var(--space-6); }
.message-content pre {
  margin: var(--space-3) 0;
  padding: var(--space-3);
  background: var(--color-paper-sunken);
  border-radius: var(--radius-md);
  overflow-x: auto;
}
.message-content code {
  background: var(--color-paper-sunken);
  padding: 0 0.2em;
  border-radius: var(--radius-sm);
}
.message-content pre code {
  padding: 0;
  background: transparent;
}

.message.is-streaming .message-content::after {
  content: "";
  display: inline-block;
  width: 0.5em;
  height: 1em;
  margin-left: 0.1em;
  background: var(--color-ink);
  animation: blink 1s steps(2, start) infinite;
  vertical-align: -0.1em;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.message .btn-copy {
  opacity: 0;
  color: var(--color-ink-muted);
}

.message:hover .btn-copy,
.message:focus-within .btn-copy {
  opacity: 1;
}

.thinking-block {
  margin-bottom: var(--space-3);
}

.thinking-toggle {
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
}

.thinking-label {
  color: var(--color-ink-muted);
  animation: pulse 1.2s ease-in-out infinite;
}

.thinking-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.thinking-content.is-open {
  margin-top: var(--space-2);
}

.thinking-content pre {
  padding: var(--space-3);
  background: var(--color-paper-sunken);
  border-left: 3px solid var(--color-ink-faint);
  overflow: auto;
  white-space: pre-wrap;
}

.attachment-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.attachment-history-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  border: var(--border-thin);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  background: var(--color-paper);
  color: var(--color-ink-muted);
}

.attachment-history-chip img {
  width: 56px;
  height: 40px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

@keyframes blink { 50% { opacity: 0; } }
@keyframes pulse { 50% { opacity: 0.45; } }