* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background: #f9f9f9;
  color: #333;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #222;
  padding: 10px 20px;
}
.navbar .logo { color: #fff; }
.navbar ul { list-style: none; display: flex; }
.navbar ul li { margin: 0 10px; }
.navbar ul li a { color: #fff; text-decoration: none; }
#darkModeToggle { background: none; border: none; font-size: 18px; cursor: pointer; color: #fff; }
main { padding: 20px; min-height: 80vh; }
footer {
  background: #222; color: #fff; text-align: center; padding: 10px;
}
.test-box {
  background: #fff; padding: 20px; border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
textarea {
  width: 100%; padding: 10px; margin-top: 10px; font-size: 16px;
}
button {
  margin-top: 10px; padding: 10px 20px; cursor: pointer;
  border: none; border-radius: 5px; background: #007bff; color: #fff;
}
button:hover { background: #0056b3; }
.dark-mode { background: #121212; color: #ddd; }
.dark-mode .navbar, .dark-mode footer { background: #000; }