:root[data-gantt-theme="light"] {
  --legend-feature-bg: rgba(124, 58, 237, 0.25);
  --legend-feature-fg: #4c1d95;
  --legend-feature-accent: #7c3aed;

  --legend-project-bg: rgba(59, 130, 246, 0.18);
  --legend-project-fg: #1e3a8a;
  --legend-project-accent: #3b82f6;

  --legend-task-bg: rgba(16, 185, 129, 0.16);
  --legend-task-fg: #064e3b;
  --legend-task-accent: #10b981;

  --legend-deadline-bg: rgba(239, 68, 68, 0.16);
  --legend-deadline-fg: #7f1d1d;
  --legend-deadline-accent: #ef4444;

  /* Surfaces */
  --surface-ctrl: #ededed;
  --surface-ctrl-button: #ffffff;
  --weekend-bg: #f0dfe5; /* Original soft pink */

  /* Text */
  --text-main: rgba(0, 0, 0, 0.7);
  --text-muted: rgba(0, 0, 0, 0.54);
  --text-weak: rgba(0, 0, 0, 0.38);

  /* Accents */
  --accent-primary: #0288d1;
  --accent-radio: #8a9ada;

  --deadline: #b42318;
  --constraint: #8a5a00;
  --success: #059669;

  --hierarchy-epic: #64748b;
  --feature-accent: #7c3aed;
  --feature-bg: rgba(124, 58, 237, 0.25);
  --feature-fg: #4c1d95;
  --hierarchy-link-ss: #9f1239;
  --hierarchy-link-fs: #475569;
  --hierarchy-link-ff: #15803d;

  --badge-text-light: #ffffff;

  /* Lines */
  --grid-line: rgba(15, 23, 42, 0.08);
  --cell-line: rgba(15, 23, 42, 0.02);
}

:root[data-gantt-theme="dark"] {
  --legend-feature-bg: rgba(124, 58, 237, 0.4);
  --legend-feature-fg: rgba(255, 255, 255, 0.92);
  --legend-feature-accent: rgba(167, 139, 250, 0.95);

  --legend-project-bg: rgba(59, 130, 246, 0.32);
  --legend-project-fg: rgba(255, 255, 255, 0.92);
  --legend-project-accent: rgba(147, 197, 253, 0.95);

  --legend-task-bg: rgba(16, 185, 129, 0.28);
  --legend-task-fg: rgba(255, 255, 255, 0.92);
  --legend-task-accent: rgba(110, 231, 183, 0.95);

  --legend-deadline-bg: rgba(239, 68, 68, 0.28);
  --legend-deadline-fg: rgba(255, 255, 255, 0.92);
  --legend-deadline-accent: rgba(252, 165, 165, 0.95);

  --surface-ctrl: #0b1220;
  --surface-ctrl-button: #111827;

  --text-main: rgba(255, 255, 255, 0.88);
  --text-muted: rgba(255, 255, 255, 0.65);
  --text-weak: rgba(255, 255, 255, 0.4);

  --accent-primary: #38bdf8;
  --accent-radio: #a5b4fc;
  --weekend-bg: #475569; /* mid slate - perfect contrast */

  --deadline: #fb7185;
  --constraint: #fbbf24;
  --success: #22c55e;

  --hierarchy-epic: #94a3b8;
  /* Feature (dark) */
  --feature-accent: #a78bfa; /* lighter border/accent */
  --feature-bg: rgba(124, 58, 237, 0.4); /* stronger tint on dark */
  --feature-fg: rgba(255, 255, 255, 0.92); /* readable text */

  --hierarchy-link-ss: #fb7185;
  --hierarchy-link-fs: #64748b;
  --hierarchy-link-ff: #4ade80;

  --badge-text-light: #0b1220;

  --grid-line: rgba(255, 255, 255, 0.1);
  --cell-line: rgba(255, 255, 255, 0.06);
}