body {
  font-family: system-ui, sans-serif;
  margin: 0 auto;
  padding: 1rem;
  background-color: var(--bg-color, #f8f9fa);
  color: var(--text-color, #222);
  max-width: 100%;
  width: min(100%, 700px);
  box-sizing: border-box;
}

h1, h2 {
  color: #333;
  margin-bottom: 0.5rem;
}

form {
  margin-bottom: 2rem;
}

input, select, button {
  padding: 0.5em;
  margin: 0.5em 0.25em 0.5em 0;
  font-size: 1rem;
}

button {
  background: #333;
  color: #fff;
  border: none;
  border-radius: 4px;
}

button:hover {
  background: #555;
}

ul#task-list {
  padding: 0;
}

ul#task-list li {
  background: white;
  border: 1px solid #ccc;
  border-radius: 4px;
  margin-bottom: 1rem;
  padding: 1rem;
  list-style: none;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}