:root[data-theme="sepia"] {
  --bg: #2b241d;          /* deep warm brown */
  --surface: #352c24;     /* header / cards */
  --text: #f1e9dd;        /* warm off-white */
  --border: #4a3f33;
  --accent: #c19a6b;      /* muted gold */
}

[data-theme="sepia"] {
  --hero-grad-start: #2a231c;
  --hero-grad-mid:   #332a21;
  --hero-grad-end:   #3d3226;

  --landing-surface: linear-gradient(
    180deg,
    #342b22,
    #2a221b
  );

  --landing-card: #3a3026;
}