:root {
  --background-color: #ffffff;
  --text-color: #000000;
  --primary-color: #007bff;
  --form-background: #f8f9fa;
  --input-border: #ced4da;
}

[data-theme='dark'] {
  --background-color: #121212;
  --text-color: #ffffff;
  --form-background: #232323;
  --input-border: #495057;
}

body {
  background-color: var(--background-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
  font-family: sans-serif;
  padding: 20px;
}

#theme-toggle {
    padding: 10px 15px;
    border: 1px solid var(--text-color);
    background-color: var(--background-color);
    color: var(--text-color);
    cursor: pointer;
    margin-bottom: 20px;
}

h2 {
  text-align: center;
  margin-bottom: 20px;
}

form {
  background-color: var(--form-background);
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  max-width: 500px;
  margin: auto;
}

label {
  display: block;
  margin-bottom: 15px;
  font-weight: bold;
}

input[type="email"],
textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--input-border);
  border-radius: 4px;
  background-color: var(--background-color);
  color: var(--text-color);
}

button[type="submit"] {
  width: 100%;
  padding: 10px 15px;
  border: none;
  background-color: var(--primary-color);
  color: white;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  transition: background-color 0.2s;
}

button[type="submit"]:hover {
  background-color: #0056b3;
}