:root[data-theme="dark"] {
  --ink: #ecf6f2;
  --muted: #a9b8b3;
  --line: #244b40;
  --surface: #12251f;
  --soft: #0a1714;
  --shadow: 0 12px 34px rgba(0, 0, 0, .3);
}

:root[data-theme="dark"] .site-header { background: rgba(18, 37, 31, .9); }
:root[data-theme="dark"] .form-control,
:root[data-theme="dark"] .form-select {
  background: #0d1e19;
  color: var(--ink);
  border-color: var(--line);
}