body {
  font-family: Arial, sans-serif;
  background: #f0f0f0;
  color: #222;
  margin: 0;
  padding: 20px;
  transition: background 0.3s, color 0.3s;
}

a { color: #007BFF; }

input, textarea, button {
  display: block;
  font-size: 16px;
  padding: 8px;
  margin: 8px 0;
  width: 100%;
  max-width: 500px;
}

video {
  max-width: 100%;
  height: auto;
}

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

body.dark-mode input,
body.dark-mode textarea,
body.dark-mode button {
  background: #1e1e1e;
  color: #eee;
  border: 1px solid #555;
}

body.dark-mode a {
  color: #66B2FF;
}

.dark-toggle {
  position: fixed;
  top: 10px;
  right: 10px;
  background: #007BFF;
  color: white;
  border: none;
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 5px;
}