body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  transition: background 0.5s ease, color 0.5s ease;
}

body.light {
  background: linear-gradient(to right, #f3e5f5, #e1bee7);
  color: #222;
}

body.dark {
  background: linear-gradient(to right, #212121, #424242);
  color: #eee;
}

main {
  text-align: center;
  max-width: 600px;
  width: 100%;
  padding: 1rem;
  background: white;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  transition: background 0.5s ease;
}

body.dark main {
  background: #333;
}

input, select, button {
  font-size: 1rem;
  padding: 0.5rem;
  margin: 0.5rem;
  border-radius: 5px;
  border: 1px solid #ccc;
}

button {
  background: #8e24aa;
  color: white;
  cursor: pointer;
}

button:hover {
  background: #6a1b9a;
}

canvas {
  margin-top: 1rem;
  width: 100%;
  max-width: 600px;
  height: 300px;
}

.selectors {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.5rem 0;
}

#theme-toggle {
  margin-bottom: 1rem;
}