body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
}

header {
  background: #222;
  color: #fff;
  padding: 2rem;
  text-align: center;
}

nav a {
  margin: 0 1rem;
  color: #fff;
  text-decoration: none;
}

section {
  padding: 2rem;
  background: #fff;
  margin: 1rem;
  border-radius: 8px;
}

footer {
  text-align: center;
  padding: 1rem;
  background: #222;
  color: #fff;
}

/* === DARK MODE STYLES === */

body.dark-mode {
  background-color: #121212;
  color: #f4f4f4;
}

/* Apply dark mode to all sections */
body.dark-mode section {
  background-color: #1e1e1e;
  color: #f4f4f4;
  border: 1px solid #333;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

/* Header and footer */
header.dark-mode,
footer.dark-mode {
  background-color: #1e1e1e;
  color: #f4f4f4;
}

/* Headings and text */
body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode p,
body.dark-mode li {
  color: #f4f4f4;
}

/* Navigation links */
body.dark-mode nav a {
  color: #90caf9;
}

/* Form fields */
body.dark-mode input,
body.dark-mode textarea {
  background-color: #1e1e1e;
  color: #f4f4f4;
  border: 1px solid #444;
}

/* Buttons */
body.dark-mode button {
  background-color: #333;
  color: #f4f4f4;
  border: 1px solid #555;
}