:root {
  --background-light: #f8f9fa;
  --background-dark: #121212;
  --text-light: #212529;
  --text-dark: #f5f5f5;
  --text-body-light: #495057;
  --text-body-dark: #b0b0b0;
  --border-light: #dee2e6;
  --border-dark: #333333;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Georgia, serif;
  background-color: var(--background-light);
  color: var(--text-light);
  min-height: 100vh;
  transition:
    background-color 0.3s,
    color 0.3s;
}

header {
  width: 100%;
  background-color: var(--background-dark);
  padding: 10px 0;
  color: var(--text-dark);
}

body.dark-mode {
  background-color: var(--background-dark);
  color: var(--text-dark);
}

body.dark-mode header {
  border-bottom: 1px solid var(--border-dark);
}

h2 {
  margin: 0;
  font-size: 1.2rem;
  cursor: pointer;
  color: inherit;
}