:root {
  --background-color: #f0f0f0;
  --container-background: white;
  --text-color: #333;
  --subtle-text-color: #666;
  --input-border-color: #ccc;
  --button-background: #007bff;
  --button-text-color: white;
  --button-hover-background: #0056b3;
}

body.dark-mode {
  --background-color: #222;
  --container-background: #333;
  --text-color: #f0f0f0;
  --subtle-text-color: #aaa;
  --input-border-color: #555;
  --button-background: #0056b3;
  --button-text-color: white;
  --button-hover-background: #003d80;
}

body {
  font-family: sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  transition: background-color 0.3s, color 0.3s;
}

.container {
  background-color: var(--container-background);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  text-align: center;
}

h1 {
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1.5rem;
  color: var(--subtle-text-color);
}

.input-container {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

input {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--input-border-color);
  border-radius: 4px;
  background-color: var(--container-background);
  color: var(--text-color);
}

button {
  background-color: var(--button-background);
  color: var(--button-text-color);
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
}

button:hover {
  background-color: var(--button-hover-background);
}

#result {
  margin-top: 1.5rem;
  font-size: 1.1rem;
  font-weight: bold;
}

#theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  padding: 0.5rem 1rem;
}