:root {
  --ai-tone-red: #b3473f;
  --ai-tone-rose: #b56b5f;
  --ai-tone-gold: #a47a34;
  --ai-tone-mist: #6f8f96;
  --ai-tone-green: #4f7f62;
  --ai-tone-blue: #4e6f96;
  --ai-tone-purple: #74609a;
  --ai-tone-gray: #777b82;
}

.bubble .txt .ai-tone { font-weight: 600; }
.bubble .txt .ai-tone-red { color: var(--ai-tone-red); }
.bubble .txt .ai-tone-rose { color: var(--ai-tone-rose); }
.bubble .txt .ai-tone-gold { color: var(--ai-tone-gold); }
.bubble .txt .ai-tone-mist { color: var(--ai-tone-mist); }
.bubble .txt .ai-tone-green { color: var(--ai-tone-green); }
.bubble .txt .ai-tone-blue { color: var(--ai-tone-blue); }
.bubble .txt .ai-tone-purple { color: var(--ai-tone-purple); }
.bubble .txt .ai-tone-gray { color: var(--ai-tone-gray); }