body.theme-dual {
  --bg: #ece7de; --ink: #14202b; --muted: #5a5348; --accent: #6b4f3a;
  --line: #ddd4c6; --card: #f7f2ea;
  --display: Georgia, "Times New Roman", serif;
  --radius: 0px; --btn-radius: 12px;
}
body.theme-dual .head-cta { background: var(--accent); }