:root[data-theme='light'] { --page: #ffffff; }
:root[data-theme='dark'] { --page: #0b0b0b; }

:root[data-theme='light'] .case-card {
  background: #f7fbf8;
  border-color: #e0ece4;
}

:root[data-theme='light'] .open-demo {
  background: #dcefe3;
  border-color: #bdddc9;
  color: #18563e;
}

:root[data-theme='light'] .open-demo:hover {
  background: #cce6d6;
  border-color: #9cc6ad;
}